CN110595941A

CN110595941A - Medium-high voltage electrical equipment gas leakage monitor and monitoring system

Info

Publication number: CN110595941A
Application number: CN201910830698.2A
Authority: CN
Inventors: 郭正操; 黄小泵; 曾伟; 郝彩侠; 王乐乐
Original assignee: Shanghai Leyan Electric Co Ltd
Current assignee: Shanghai Leyan Electric Co Ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2019-12-20

Abstract

The invention discloses a gas leak monitor. A medium and high voltage electrical equipment gas leak monitor comprising: the intelligent temperature sensor comprises an intelligent microprocessor, a pressure sensor, a temperature sensor, a communication module and a memory; and the pressure sensor is communicated with a gas path of the gas density monitor. The intelligent microprocessor is respectively connected with the temperature sensor, the pressure sensor and the communication module; the intelligent microprocessor collects pressure signals through the pressure sensor and temperature signals through the temperature sensor according to the set sampling frequency, and corresponding density value P is obtained through operation processing of the intelligent microprocessor₂₀(ii) a The intelligent microprocessor obtains the corresponding density value P₂₀Performing depth calculation to obtain accurate density value P_{20 is accurate}And the intelligent microprocessor is used for displaying the monitored air leakage information of the medium-high voltage electrical equipment. The invention can accurately perform online monitoring and fault diagnosis on the gas insulated electrical equipment, and can find the gas insulated electrical equipment in time when gas leakage occurs.

Description

Medium-high voltage electrical equipment gas leakage monitor and monitoring system

Technical Field

The invention relates to the technical field of electric power, in particular to a monitor, a method and a system for gas leakage of electrical equipment, which are applied to high-voltage and medium-voltage electrical equipment.

Background

At present, SF₆(sulfur hexafluoride) electrical equipment is widely applied to the power sector and industrial and mining enterprises, and rapid development of the power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and SF (sulfur hexafluoride) is₆Electrical equipment is used more and more. SF₆The gas has functions of arc extinction and insulation in high-voltage electrical equipment, and SF in the high-voltage electrical equipment₆If the density of the gas is reduced and the micro water content exceeds the standard, the SF is seriously influenced₆Safe operation of high-voltage electrical equipment: 1) SF₆The reduction of the gas density to a certain extent will result in a loss of insulation and arc extinguishing properties. 2) In the presence of some metal species, SF₆The gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF₂The insulation and metal parts are corroded and generate a large amount of heat, so that the pressure of the gas chamber is increased. 3) When the temperature is reduced, excessive moisture can form condensed water, so that the surface insulation strength of the insulation part is obviously reduced, and even flashover is caused, thereby causing serious harm. Therefore, the grid operating regulations impose that the SF must be applied before and during the operation of the plant₆The density and water content of the gas are periodically measured.

On the other hand, as the unattended substation develops towards networking and digitization and the requirements on remote control and remote measurement are continuously strengthened, the SF is subjected to₆The online monitoring of the gas density and the micro-water content state of the electrical equipment has important practical significance. With the continuous and vigorous development of the Chinese smart grid, the intelligent high-voltage electrical equipmentThe intelligent transformer substation is prepared to be used as an important component and a key node of the intelligent transformer substation, and plays a very important role in the safety of an intelligent power grid. At present, most of high-voltage electrical equipment is SF₆In the case of gas-insulated equipment, if the gas density is reduced (such as caused by leakage), the electrical performance of the equipment is seriously affected, and serious hidden danger is caused to safe operation. Currently on-line monitoring of SF₆Gas density values in high voltage electrical equipment have become very common and gas density monitoring system (gas density monitor) applications have been developed vigorously for this purpose. Whereas current gas density monitoring systems (gas density monitors) are basically: 1) using remote transmission of SF₆The gas density monitor realizes the collection and uploading of density, pressure and temperature, and realizes the online monitoring of gas density. 2) The gas density transmitter is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. SF₆The gas density monitor is the core and key component. However, due to the severe environment of the high-voltage substation in field operation, especially the strong electromagnetic interference, in the currently used gas density monitoring system (gas density monitor), the remote transmitting SF thereof₆The gas density monitor is composed of a mechanical density relay and an electronic remote transmission part; in addition, the traditional mechanical density relay is reserved in a power grid system applying the gas density transmitter. The mechanical density relay is provided with one to three groups of mechanical contacts, and can transmit information to a target equipment terminal through a contact connecting circuit in time when pressure reaches an alarm, locking or overpressure state, so that the safe operation of equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, and an effective platform is established for realizing real-time data remote data reading and information monitoring. The information such as pressure, temperature, density and the like can be timely transmitted to target equipment (generally a computer terminal) to realize online monitoring.

The regular inspection of an SF6 gas density monitor on SF6 electrical equipment is a necessary measure for preventing the SF6 gas density monitor from being suffered in advance and ensuring the safe and reliable operation of the SF6 electrical equipment; the 'electric power preventive test regulation' and the 'twenty-five key requirements for preventing serious accidents of electric power production' both require that a SF6 gas density monitor be regularly checked; from the actual operation condition, the regular verification of the SF6 gas density monitor is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the calibration of SF6 gas density monitor is now very important and popular in power systems, and has been implemented by various power supply companies, power plants, and large-scale industrial and mining enterprises. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. For this reason, it is highly desirable to improve upon existing gas density monitoring gas density monitors.

Particularly, innovations are made in the gas density on-line monitoring gas density monitor or system, so that the gas density on-line monitoring gas density monitor or system has the density relay checking function, regular checking work of the mechanical density relay is further completed, checking work of the density relay can be completed without the need of a maintainer arriving at the site, efficiency is greatly improved, and cost is reduced. And simultaneously, the micro-water value inside the gas chamber of the equipment is accurately measured in a gas density monitor or a system.

Edge computing refers to an open platform integrating network, computing, storage and application core capabilities at one side close to an object or a data source to provide nearest-end services nearby. The application program is initiated at the edge side, so that a faster network service response is generated, and the basic requirements of the industry in the aspects of real-time business, application intelligence, safety, privacy protection and the like are met. The edge computation is between the physical entity and the industrial connection, or on top of the physical entity. And the cloud computing still can access the historical data of the edge computing

For the internet of things, the edge computing technology makes a breakthrough, which means that many controls are realized through local equipment without being handed to a cloud, and the processing process is completed in a local edge computing layer. This will undoubtedly promote the processing efficiency greatly, alleviate the load in the cloud.

Disclosure of Invention

The present invention is directed to solve the above-mentioned drawbacks of the prior art, and provides a gas leakage monitor and monitoring system for medium and high voltage electrical equipment. The invention is used for accurately monitoring the gas density of the gas-insulated or arc-extinguishing electrical equipment, improving the working efficiency, reducing the operation and maintenance cost and ensuring the safe operation of a power grid.

Specifically, the gas leakage monitor for high-voltage electrical equipment according to the present invention comprises: the intelligent microprocessor, the pressure sensor and the temperature sensor; the pressure sensor is communicated with a gas path of the gas density monitor, and the intelligent microprocessor is respectively connected with the temperature sensor and the pressure sensor; the intelligent microprocessor collects pressure signals through the pressure sensor and temperature signals through the temperature sensor according to the set sampling frequency, and obtains corresponding density value P through the operation processing of the intelligent microprocessor according to the gas pressure-temperature characteristic₂₀(ii) a The intelligent microprocessor is provided with gas leakage notification information of the monitored medium-high voltage electrical equipment, wherein the gas leakage notification information comprises but is not limited to one or more of gas leakage amount, gas leakage rate, gas leakage value and gas leakage degree of the electrical equipment; or the intelligent microprocessor is provided with air leakage notification information of the monitored middle-high voltage electrical equipment, namely according to the set air leakage alarm density value P_{20 air leakage alarm}When the monitored density value P₂₀Equal to or less than leakage alarm density value P_{20 air leakage alarm}When the alarm is started, the monitor sends out an air leakage alarm signal or uploads air leakage notification information.

The gas leakage monitor for the medium-high voltage electrical equipment further comprises a communication module or/and a memory.

The medium-high voltage electrical equipment gas leakage monitor is characterized in that the intelligent microprocessor obtains the corresponding density value P₂₀The processing is depth calculation processing: the intelligent microprocessor calculates and processes the detected gas density value by adopting an average value method to obtain a gas density value P₂₀Average value P of_{20 average}The average value P_{20 average}Is the exact density value P_{20 is accurate}。

The medium-high voltage electrical equipment gas leakage monitor comprises the following average value method: setting collection frequency in a set time interval, and carrying out average calculation processing on N density values of different collected time points to obtain a gas density value P₂₀Average value P of_{20 average}To obtain accurate density value P_{20 is accurate}(ii) a Or, setting temperature interval step length in a set time interval, and carrying out average value calculation processing on density values (N) of different temperature values acquired in all temperature ranges to obtain a gas density value P₂₀Average value P of_{20 average}To obtain accurate density value P_{20 is accurate}(ii) a Or, setting pressure interval step length in a set time interval, and carrying out average value calculation processing on density values (N) of different pressure values acquired in all pressure variation ranges to obtain a gas density value P₂₀Average value P of_{20 average}To obtain accurate density value P_{20 is accurate}。

The gas leakage monitor for the medium-high voltage electrical equipment is characterized in that the depth calculation processing comprises the following steps: the intelligent microprocessor is used for controlling the gas density value P at certain intervals₂₀Fourier transform is carried out, the frequency spectrum is converted into corresponding frequency spectrum, periodic components are filtered out, and then accurate density value P is obtained through calculation_{20 is accurate}。

The gas leakage monitor for the medium-high voltage electrical equipment is characterized in that the depth calculation processing comprises the following steps: the intelligent microprocessor decomposes the components into trend, periodicity and random components according to the time sequence, and judges the gas leakage condition according to the trend components.

According to the gas leakage monitor of the medium-high voltage electrical equipment, the intelligent microprocessor judges that gas leaks when detecting that the trend component value is equal to or greater than the set trend component value according to the set trend component value, and the intelligent microprocessor sends an alarm signal or alarm information; the alarm signal is uploaded to target equipment through a signal wire; and the alarm information is uploaded to target equipment or a target platform through a communication module.

The medium-high voltage electrical equipment gas leakage monitor has accurate density value P_{20 is accurate}Density value P₂₀And the corresponding pressure value and the corresponding temperature value are uploaded to the target equipment or the target platform through the communication module, so that the gas density value of the electrical equipment can be monitored accurately and online comprehensively.

The gas leakage monitor of the medium-high voltage electrical equipment is characterized in that the intelligent microprocessor is used for analyzing and judging data and storing the data, and corresponding alarm signals are given according to a set alarm strategy.

The gas leakage monitor of the medium-high voltage electrical equipment is characterized in that the intelligent microprocessor is used for monitoring the gas density value P of the electrical equipment at set time intervals₂₀The trend change value DeltaP of₂₀Lower or higher than the set trend change value DeltaP_{20 set}When the alarm is started, the monitor sends out an alarm signal and/or an alarm signal contact and/or alarm information; or upload announcement information.

The trend change value delta P of the gas leakage monitor for the medium-high voltage electrical equipment₂₀Comprises the following steps: setting collection frequency in set time interval, calculating average value of density values of different time points to obtain gas density value P₂₀Average value P of_{20 average}Then, a trend calculation period T is set_{Period of time}Obtaining a trend change value delta P₂₀＝P_{20 average (previous T period value)}-P_{20 average (T period)}I.e. the mean value P_{20 average}Front-back period T_{Period of time}A difference of (d); alternatively, the first and second electrodes may be,

at a set time interval T_SpacerWhen the gas density value P of the monitored electrical equipment is₂₀The trend change value DeltaP of₂₀＝P_{20 (previous T interval)}-P_{20(T interval)}I.e. density value P₂₀Front-to-back time interval T_SpacerA difference of (d); alternatively, the first and second electrodes may be,

at a set time interval T_SpacerA set time length T_{Length of}. Using a set time interval T_SpacerSetting the collection frequency, and collecting all the density values P of different time points₂₀Performing accumulative calculation to obtain an accumulative value sigma_P20Obtaining a trend change value delta P₂₀＝∑_{P20 (previous T length)}-∑_{P20 (when T length)}I.e. the time length T before and after_{Length of}Cumulative value Σ_P20The difference between them.

The intelligent microprocessor calculates the gas leakage rate L of the monitored electrical equipment, and the gas leakage rate L is equal to delta P_20t/t＝(P_{20 is accurate}t_{Front side}-P_{20 accurate t}. ) T, in the formula: t is a set time interval, Δ P_20tIs the variation of density value, P, in time interval t_{20 is accurate}t_{Front side}Is the density value, P, of the moment before the time interval t_{20 is accurate}t is the density value after the time interval t. The monitor updates the information for giving out the air leakage rate L notification in time; or upload the updated leakage rate L notification information in time.

The gas leakage monitor of the medium-high voltage electrical equipment sends out a gas leakage alarm signal when the monitored trend component value is equal to or greater than the set trend component value according to the set trend component value; or send out the leak alarm signal contact; or sending out air leakage notification information; or uploading leakage notification information; alternatively, the first and second electrodes may be,

according to a set time interval T_SpacerWhen the gas density value P of the monitored electrical equipment is₂₀The trend change value DeltaP of₂₀Equal to or greater than the set gas density value P₂₀The trend change value DeltaP of_{20 set}When the alarm is started, the monitor sends out an air leakage alarm signal, an air leakage alarm signal contact and air leakage notification information; or uploading leakage notification information; alternatively, the first and second electrodes may be,

according to the set air leakage rate L_{Setting up}When the monitored air leakage rate L is equal to or greater than the set air leakage rate L_{Setting up}When the alarm is in use, the monitor sends out an air leakage alarm signal; or send out the leak alarm signal contact; or send out air leakage notification information(ii) a Or upload air leak notification information.

The intelligent microprocessor calculates the gas leakage Q of the monitored electrical equipment_L，Q_L＝Q_{First stage}-Q_{At present, the method}＝ρ_{First stage}*V-ρ_{At present, the method}V; in the formula: rho_{First stage}For calculating the gas mass density at the initial stage of the gas leakage, ρ_{At present, the method}The current gas mass density is V, and the volume of a gas chamber of the electrical equipment is V; according to the gas density value P at the initial stage of calculating the gas leakage amount_{20 at the beginning}And its gas properties to obtain mass density rho_{First stage}(ii) a According to the currently detected density value P₂₀And its gas properties to obtain mass density rho_{At present, the method}。

The intelligent microprocessor is used for controlling the air leakage rate L and the air leakage time T according to the air leakage rate L_LAnd calculating to obtain the gas leakage Q of the monitored electrical equipment_L。

The intelligent microprocessor carries out deep calculation processing to obtain annual air leakage Q including but not limited to the gas of the electrical equipment_LYSeasonal air leakage Q_LQMonthly air leakage Q_LMPeripheral leakage Q_LWDaily air leakage Q_LDOne or more of them.

The intelligent microprocessor calculates the gas leakage value delta P of the monitored electrical equipment_20L，△P_20L＝P_{20 accurate initial point}-P_{20 accurate current}In the formula: p_{20 accurate initial point}Is an initial accurate gas density value, P_{20 accurate current}The current accurate gas density value; alternatively, the first and second electrodes may be,

the intelligent microprocessor calculates the gas leakage value delta P of the monitored electrical equipment_20L，△P_20L＝P_{20 at the beginning}-P_{20 at present}In the formula: p_{20 at the beginning}Is the initial gas density value, P_{20 at present}Is the current gas density value.

The intelligent microprocessor is divided into one or more of serious air leakage, moderate air leakage, slight air leakage and micro air leakage according to the air leakage degree.

The gas leakage degree is graded according to one or more of the gas leakage rate, the gas leakage amount and the gas leakage value.

The medium-high voltage electrical equipment gas leakage monitor, the intelligent microprocessor has the gas supplementing control function for the monitored electrical equipment, and the density value P for supplementing gas according to the setting requirement_{20 air supplement}When the monitored density value P_{20 is accurate}Is equal to or less than density value P_{20 air supplement}When the air is supplied, the monitor sends an air supply alarm signal; or send out the alarm signal contact of tonifying qi; or sending out the air replenishing notification information; or upload the air supplement notification information.

The intelligent microprocessor sends out notification information to the gas supply time of the monitored electrical equipment; according to the set density value P of air supplement_{20 air supplement}Time of air supply T_{Time of air supply}＝(P_{20 is accurate}-P_{20 air supplement}) The monitor updates the notification information of the air supply time in time; or updating and uploading the air replenishing time information in time.

The gas leakage monitor for middle and high voltage electrical equipment, the intelligent microprocessor has the function of informing the gas supply quality of the monitored electrical equipment, and the density value P of the gas supply is set according to the requirement_{20 air supplement}The volume V of the air chamber of the electrical equipment is calculated to obtain the gas supply quality Q_{Air supplement}Gas-supplementing quality Q emitted by monitor_{Air supplement}Information; or uploading gas for supplementing qi quality Q_{Air supplement}And (4) information.

The medium-high voltage electrical equipment gas leakage monitor, the intelligent microprocessor gas supply quality Q_{Air supplement}The calculation method comprises the following steps: density value P of air supplement according to need_{20 need to}According to the value P of the density of the make-up gas_{20 need to}And its gas properties to obtain mass density rho_{Need to make sure that}The total required gas mass Q of the gas chamber of the electrical equipment can be known_{General assembly}＝ρ_{Need to make sure that}V; and the currently detected density value P₂₀According to the currently detected density value P₂₀And its gas properties to obtain mass density rho_{At present, the method}Can know the gas of the electrical equipmentCurrent gas mass of the chamber, Q, is now ρ_{At present, the method}V; thus, Q can be obtained_{Air supplement}＝Q_{General assembly}-Q is currently. Monitor for timely updating gas supply quality Q_{Air supplement}Notification information; or timely updating the gas-supplying quality Q_{Air supplement}And (4) information.

In the medium-high voltage electrical equipment gas leakage monitor, the intelligent microprocessor corrects the set time interval value t of the gas leakage rate L.

The gas leakage monitor for the medium-high voltage electrical equipment also comprises an electronic notification signal contact, and when the gas pressure value or the temperature value of the monitored electrical equipment is lower than or higher than the set pressure value P_{Setting up}Or a temperature value T_{Setting up}When the monitor is started, the monitor outputs a notification signal contact; alternatively, the first and second electrodes may be,

further comprises a notification signal contact for indicating when the temperature reaches a set temperature threshold T_{Setting a threshold value}When the gas pressure value of the monitored electrical equipment is lower or higher than the set pressure value P_{Setting up}At this time, the monitor outputs a notification signal contact.

The gas leakage monitor for the medium-high voltage electrical equipment is characterized in that the electronic signal contact comprises one or more of an electromagnetic relay, a solid-state relay, a time relay, a power relay, a silicon controlled rectifier, an electronic switch, an electric contact, an optical coupler, a DI (direct-input) transistor, an MOS (metal oxide semiconductor) field effect transistor, a triode, a diode and an MOS FET (metal oxide semiconductor) relay.

The set value of the gas leakage monitor for the medium-high voltage electrical equipment can be modified and stored on line.

The density monitor can input events such as air supplement or/and air release tests and the like, and can carry out a gas density value P according to the corresponding events such as the air supplement or/and air release tests and the like₂₀New calculations or adjustments.

The gas leakage monitor for the medium-high voltage electrical equipment is characterized in that the intelligent microprocessor monitors the gas density value P in a certain short time₂₀Gradually increasing, judging as qi invigorating event, and monitoring at that timeMaximum gas density value P of₂₀Judging that the gas supplementing event is ended, and carrying out gas density value P_{20 is accurate}New calculations or adjustments.

The gas leakage monitor of the medium-high voltage electrical equipment is characterized in that the intelligent microprocessor monitors the gas density value P in a certain short time₂₀Gradually and slightly dropping, the gas discharge test, the micro water or the decomposition event can be judged, and the gas discharge test, the micro water or the decomposition event can be carried out according to the minimum gas density value P monitored at the time₂₀If so, judging that the air discharge test event is ended, and carrying out gas density value P_{20 is accurate}New calculations or adjustments.

In the medium-high voltage electrical equipment gas leakage monitor, an intelligent microprocessor of the density monitor records gas supply or/and gas discharge test events, time, times and gas quality information.

The gas density monitor also comprises a display unit with gas leakage or/and indication value display.

The medium-high voltage electrical equipment gas leakage monitor, the gas density monitor further comprises a mechanical control part, the mechanical part comprises: the device comprises a pressure detector, a temperature compensation element, a plurality of signal generators and a signal adjusting mechanism.

The gas density monitor also comprises a movement, a pointer and a dial, and has density indicating value display.

The gas density monitor also comprises a micro-water sensor, the gas micro-water value is monitored on line, and when the micro-water value exceeds a set value, the monitor sends out micro-water overproof notification information; or uploading micro-water exceeding notification information.

The gas density monitor also comprises a decomposed product sensor which monitors the decomposed products of the gas on line, and when the content of the decomposed products exceeds a set value, the monitor sends out the content exceeding notification information of the decomposed products; or uploading the information of the notice that the content of the decomposition products exceeds the standard.

The gas leakage monitor is used for parallelly or serially connecting monitored data and information thereof to a signal generator or a special line through an output electronic signal contact, and uploading the data and the information through regular codes; the uploaded data specifically relates to one or more of monitored gas leakage amount, gas leakage rate, gas leakage value, gas leakage degree, density value, pressure value, temperature value, density value of electrical equipment, over-low density value, gas leakage, over-high pressure, over-high temperature, pressure of a gas density monitor, abnormal information of a temperature sensor and self-diagnosis result of the monitor.

The gas leakage monitor for the medium-high voltage electrical equipment is characterized in that the temperature sensor is arranged near a temperature compensation element of the gas density monitor.

The gas leakage monitor for the medium-high voltage electrical equipment is characterized in that the intelligent microprocessor automatically controls the whole process based on one or more of a general computer, an industrial personal computer, an ARM chip, an AI chip, a CPU, an MCU, an FPGA, a PLC, an industrial control mainboard and an embedded main control board, and embeds an algorithm and a control program, and comprises all peripherals, logic, input and output.

The density monitor outputs notification signal contacts which are connected to a plurality of signal generators in parallel or in series; alternatively, the first and second electrodes may be,

according to actual needs, the notification signal junction is connected to the junction signal of the gas density monitor in parallel or in series; or the notification signal junction is connected in parallel or in series to the control loop corresponding to the junction signal of the gas density monitor.

The middle-high voltage electrical equipment gas leakage monitor is characterized in that an intelligent microprocessor of the gas density monitor is provided with an IO interface: the test data is stored, exported and printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input.

The gas leakage monitor for the medium-high voltage electrical equipment is characterized in that an electrical interface of the density monitor is an anti-misconnection protection interface or an anti-electromagnetic interference interface.

The intelligent microprocessor realizes remote transmission of test data and/or state monitoring result information through the communication module.

The gas density monitor of the medium-high voltage electrical equipment gas leakage monitor also comprises an expert management analysis system for detecting, analyzing and judging the gas density monitoring, the equipment gas leakage, the performance of the gas density monitor and monitoring elements.

The pressure sensor and the temperature sensor are integrated.

The medium-high voltage electrical equipment gas leakage monitor further comprises an electric field shielding piece, and the electric field shielding piece is arranged outside the pressure sensor and/or the electronic part.

The medium-high voltage electrical equipment gas leakage monitor further comprises a magnetic field shielding piece, and the magnetic field shielding piece is arranged outside the pressure sensor and/or the electronic part.

The gas leakage monitor for the medium-high voltage electrical equipment is characterized in that the electronic part of the density monitor further comprises a shielding piece, and the shielding piece can play a role in shielding an electric field or a magnetic field or the electric field and the magnetic field.

The gas leakage monitor of the medium-high voltage electrical equipment is controlled by the intelligent microprocessor on site, in a background or by mutual interaction of the two.

The gas leakage monitor for the medium-high voltage electrical equipment has the functions of real-time data display of linear density values, pressure values, temperature values and the like, change trend analysis, historical data query, real-time alarm and the like.

The gas leakage monitor for the medium-high voltage electrical equipment also comprises a plurality of insulating pieces, and the pressure sensor is insulated from the shell, the mechanical part shell and the equipment connecting joint thereof through the plurality of insulating pieces; or the housing of the pressure sensor and the housing of the gas density monitor are insulated.

The gas leakage monitor for the medium-high voltage electrical equipment is characterized in that the depth calculation processing comprises the following steps: the intelligent microprocessor has the function of calculating accurate density values P of a plurality of different time intervals_{20 is accurate}。

The medium-high voltage electrical equipment gas leakage monitor has accurate density values P of a plurality of different time intervals_{20 is accurate}And the gas density value of the electrical equipment is more accurately monitored on line by uploading the gas density value to target equipment or a target platform through the communication module.

A monitoring system consisting of said medium-high voltage electrical equipment gas leak monitor, comprising: the middle-high voltage electrical equipment gas leakage monitors are connected with the remote background detection system sequentially through the concentrator and the protocol converter; wherein, the gas leakage monitors of the medium-high voltage electrical equipment are respectively arranged on the electrical equipment of the corresponding insulating gas chamber.

The monitoring system consisting of the gas leakage monitor of the medium-high voltage electrical equipment comprises: the middle-high voltage electrical equipment gas leakage monitors are connected with the remote background detection system through the concentrator, the IEC61850 or the IEC104 protocol converter in sequence; wherein, the gas leakage monitors of the medium-high voltage electrical equipment are respectively arranged on the electrical equipment of the corresponding insulating gas chamber.

The monitoring system comprises a medium-high voltage electrical equipment gas leakage monitor, wherein an RS485 concentrator is adopted as the concentrator, and an IEC61850 protocol converter or an IEC104 protocol converter is also connected with a network service printer and a network data router respectively.

The monitoring system with the middle-high voltage electrical equipment gas leakage monitor component has the functions of data display, change trend analysis, historical data query, real-time alarm and the like including, but not limited to gas leakage amount, gas leakage rate, gas leakage value, gas leakage degree, real-time online density value, pressure value, temperature value and the like. The system has the functions of data analysis and data processing, can perform corresponding fault diagnosis and prediction on the electrical equipment, and provides technical support for the state maintenance of the electrical equipment.

The invention provides a high-performance remote transmission gas density relay, a method and a system for high-voltage electrical equipment, wherein a temperature sensor and a temperature compensation element are arranged together; or the temperature sensor is directly arranged on the temperature compensation element; or the temperature sensor is arranged near the temperature compensation element. The temperature of the mechanical detection and the temperature of the remote transmission electronic detection of the remote transmission density relay are consistent, so that the remote transmission density relay is very accurate in measurement, and the test precision of the remote transmission density relay is greatly improved.

The electrical equipment comprises SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmental protection gas electrical equipment or other insulating gas electrical equipment. The electrical equipment comprises GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas-filled cabinets, ring main units and the like. The gas density relay includes: a bimetallic strip compensated gas density relay, a gas compensated gas density relay, or a bimetallic strip and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; the gas density relay with pointer display, the digital display type gas density relay and the gas density switch without display or indication; SF6 gas density relay, SF6 hybrid gas density relay, N2 gas density relay, other gas density relays, and the like.

The shield may act to shield electric or magnetic fields by reflection and/or absorption of the shield material to reduce EMI emissions. The effective addition of the shielding material can reduce or eliminate unnecessary gaps, inhibit electromagnetic coupling radiation, and reduce electromagnetic leakage and interference. Materials with high electric and magnetic conductivity can be used as electromagnetic shielding materials (such as iron), and the shielding performance is generally required to be 40-60 dB. In particular, the electronic part is sealed in a housing with shielding material. The good sealing can well overcome the interference problem caused by electromagnetic leakage due to the discontinuous conductivity of the gap.

The accurate density value P_{20 is accurate}Is a depth gaugeThe density value obtained after calculation can reflect the actual density value of the gas chamber of the electrical equipment, and the problem of temperature difference between the gas density monitor and the gas chamber of the electrical equipment is considered and solved; and a density value P₂₀The gas density monitor obtains a corresponding 20 ℃ pressure value which is obtained by converting the gas pressure-temperature characteristic according to the pressure value and the temperature value which are monitored in real time by the gas density monitor, namely a density value P monitored by the position of the gas density monitor₂₀The temperature difference between the gas density monitor and the gas chamber of the electrical equipment is not considered. The accurate density value P_{20 is accurate}The gas density value state of the gas chamber of the electrical equipment is reflected when the electrical equipment runs for a long time, and the gas density value state is suitable for reflecting the micro-leakage state of the electrical equipment and reflecting the gas density value change trend of the gas chamber of the electrical equipment; and a density value P₂₀The method is used for reflecting the current running condition of the electrical equipment, is suitable for reflecting the large leakage state of the electrical equipment and can reflect the major air leakage event of the electrical equipment in time.

Drawings

Fig. 1 is a schematic side view of a first embodiment of the present invention;

FIG. 2 is a schematic front view of a first embodiment of the present invention;

FIG. 3 is a circuit diagram according to a first embodiment of the present invention;

FIG. 4 is a system architecture diagram according to a second embodiment of the present invention;

fig. 5 is a system architecture diagram of a third embodiment of the invention.

The specific implementation mode is as follows:

in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 and 2 are schematic structural diagrams of a high-performance remote gas density relay for high-voltage electrical equipment according to an embodiment of the present invention, and as shown in fig. 1 and 2, the high-performance remote gas density relay for high-voltage electrical equipment according to an embodiment of the present invention mainly includes a mechanical portion 1 and an electronic portion 2 independent from the mechanical portion. Which comprises the following steps: the communication module 4, the pressure sensor 201 and the pressure sensor fixing seat 209; the machine part 1 comprises: a machine part housing 101, and a base 102, a pressure detector 103, a temperature compensation element 104, a movement 105, a pointer 106, a dial 1012, an end seat 108, a signal adjustment mechanism 107, a plurality of signal generators 109, a device connection joint 1010, and a temperature sensor 3, which are provided in the machine part housing. The electronic part 2 comprises an electronic part housing 2010, and an intelligent processor 202 and a power supply (power supply module) 203 which are arranged in the electronic part 2 housing. The pressure sensor 201 is fixed on the pressure sensor fixing seat 209, and the pressure sensor 201 is communicated with the pressure detector 103 on an air path. The mechanical part shell 101 and the electronic part shell 2010 are independent or separated from each other, and the intelligent processor 202 is connected with the temperature sensor 3, the pressure sensor 201 and the communication module 4 respectively. The pressure sensor 201 is fixed to the sensor housing 207 by sealing with the insulators 204, 205, 206, and then fixed to the pressure sensor holder 209 by re-mounting. The shielding piece 208 is arranged in the sensor shell 207, so that the interference resistance of the remote transmission density relay is improved. Meanwhile, a shielding part 2011 is arranged on the inner side (or the outer side) of the casing 2010, so that the anti-interference capacity of the remote transmission density relay is further improved. One end of the pressure detector 103 and one end of the temperature compensation element 104 are both fixed on the end seat 108, the other end of the pressure detector 103 is hermetically connected on the base 102, the other end of the temperature compensation element 104 is connected with the movement 105 through a display link or the other end of the temperature compensation element 104 is directly connected with the movement 105, and the pointer 106 is installed on the movement 105 and is arranged in front of the dial 1012. The signal generator 109 can adopt a microswitch or a magnetic auxiliary electric contact, and the contact signal of the density relay is output through the signal generator 109. The pressure detector 103 may employ a bourdon tube or a bellows tube. The temperature compensation element 104 may employ a compensation plate or a gas enclosed within a housing. The gas density relay of the present invention may further comprise: an oil-filled type density relay, an oil-free type density relay, a gas density meter, a gas density switch, or a gas pressure gauge. In the telemetering gas density relay according to the first embodiment of the present invention, the varying pressure and temperature are corrected by the temperature compensation element 104 based on the pressure detector 103 to reflect the variation of the (sulfur hexafluoride) gas density. Under the pressure of the measured medium (sulfur hexafluoride) gas, due to the action of the temperature compensation element 104, when the density value of the (sulfur hexafluoride) gas changes, the pressure value of the (sulfur hexafluoride) gas also changes correspondingly, so that the tail end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the elastic deformation displacement is transmitted to the movement 105 by means of the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, and the density value of the measured sulfur hexafluoride gas is indicated on the dial 1012. The signal generator 109 serves as an output alarm latch contact signal. Thus, the gas density relay can display the density value of the (sulfur hexafluoride) gas. If the density value of sulfur hexafluoride gas is reduced, the pressure detector 103 generates corresponding reverse displacement, the reverse displacement is transmitted to the movement 105 through the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, the pointer 106 moves towards the direction with small indicating value, the gas leakage degree is specifically displayed on the dial 1012, the signal generator 109 outputs (alarm locking) contact signals, and the density of sulfur hexafluoride gas in equipment such as an electrical switch and the like is monitored and controlled through a mechanical principle, so that the electrical equipment can work safely.

The intelligent microprocessor has a function of calculating accurate density values P of a plurality of different time intervals_{20 is accurate}By way of example, the exact density values P for a plurality of different time intervals_{20 is accurate}Accurate density values P corresponding to one annual time interval respectively_{20 accurate year}Accurate density values P, each corresponding to a quarterly time interval_{20 season of exactness}Accurate density values P, each corresponding to a monthly time interval_{20 accurate month}Accurate density values P, corresponding respectively to one week time intervals_{20 accurate week}Respectively corresponding to a time of dayExact density value P of interval_{20 accurate days}. The accurate density values P of the plurality of different time intervals_{20 is accurate}And the gas density value of the electrical equipment is more accurately monitored on line by uploading the gas density value to target equipment or a target platform through the communication module. In general, the density value P_{20 accurate year}Sum density value P_{20 season of exactness}Judging the electrical equipment suitable for micro leakage; and a density value P_{20 accurate month}Sum density value P_{20 accurate week}Judging the electrical equipment suitable for medium-sized air leakage; and a density value P_{20 accurate days}Sum density value P₂₀And (real-time) the method is suitable for judging the electrical equipment with serious air leakage. Through multistage calculation, the safety is guaranteed promptly in multilayer control, improves accurate capable again. Simultaneously, the problems in the industry are also innovatively solved: the temperature difference between the density relay and the electrical equipment.

Fig. 3 is a schematic circuit diagram of a high-performance remote gas density relay for high-voltage electrical equipment according to an embodiment of the present invention, and as shown in fig. 3, an intelligent processor 202 (which may be a general-purpose computer, an industrial personal computer, a CPU, a single chip microcomputer, an ARM chip, an AI chip, a quantum chip, a photonic chip, an MCU, an FPGA, a PLC, an industrial control motherboard, an embedded main control board, or the like) and a power supply 203 may be: switching power supply, alternating current 220V, direct current power supply, LDO, programmable power supply, solar energy, storage battery, rechargeable battery, battery and the like. The intelligent processor 202 collects pressure signals P through the pressure sensor 201, collects temperature signals T through the temperature sensor 3 and utilizes SF₆The mathematical model of the relationship between gas pressure and temperature is processed by the intelligent processor 202 using a soft measurement method to obtain a corresponding density value P₂₀(i.e.a pressure value P of 20 ℃ C.)₂₀) And can remotely transmit the density value P through the communication module 4₂₀Or value of density P₂₀And the pressure value P and the temperature value T or the pressure value P and the temperature value T are adopted, so that the gas density value P of the electrical equipment is monitored on line₂₀Or value of density P₂₀Pressure value P and temperature value T, or pressure value P and temperature value T. For example, the remote transmission density relay is accessed into the comprehensive automatic online monitoring system of the transformer substation through data communication modes such as RS-485 and the like and is remotely transmitted to the unattended stationThe central monitoring station carries out real-time monitoring on the local and remote central monitoring stations of the transformer substation, thereby realizing SF₆SF in electrical equipment₆On-line monitoring of gas density.

The technical product of the invention, because the temperature sensor 3 and the temperature compensation element 104 are arranged together; or the temperature sensor 3 is arranged directly on the temperature compensation element 104; or the temperature sensor 3 is arranged near the temperature compensation element 104. Through the new design treatment, the performance is greatly improved.

The remote gas density relay further comprises a thermal insulation piece 5, wherein the thermal insulation piece 5 is arranged between the mechanical part shell 101 and the electronic part shell 2010; or the thermal insulation is provided at the power source (power module). The power supply (power supply module) 203 is located away from the temperature sensor 3 and the temperature compensation element 104.

The electronic part of the density relay further includes a shield 2011, and the shield 2011 can shield the electric field, or the magnetic field, or the electric field and the magnetic field. The shield 2011 is disposed inside or outside the electronics housing. The pressure sensor is provided with a shield 208. The intelligent processor or the communication module is provided with a shielding piece; or the intelligent processor and the communication module are both provided with shielding pieces. The remote transmission gas density relay further comprises insulators 204, 205 and 206, and the pressure sensor is connected with a pressure sensor shell 207 and a sensor fixing seat 209 through the insulators 204, 205 and 206; or the pressure sensor is hermetically fixed on a pressure sensor fixing seat 209 through a plurality of insulating pieces 204, 205 and 206.

The remote transmission gas density relay also comprises a plurality of insulating pieces, and the pressure sensor is insulated from the electronic part shell, the mechanical part shell and the equipment connecting joint through the plurality of insulating pieces; or the housing of the pressure sensor and the housing of the remote gas density relay are insulated. Through the innovative design and treatment, the performance of the device is greatly improved. Through specific comparison and test, as can be seen from table 1, the precision and the anti-interference capability of the remote transmission density relay adopting the technology have better performance than those of the remote transmission density relay in the prior art, have prominent substantive characteristics and remarkable progress, can greatly improve the precision and the anti-interference capability of the remote transmission density relay, and ensure the reliable and safe operation of a power grid.

As can be known from the table 1, the precision, the anti-interference capability and the stability of the density relay adopting the technology are very good, the high-precision requirement is met, and the environmental adaptability of the density relay can be improved. Meanwhile, the key points are that the intelligent power grid has strong anti-interference capability and good stability, and the reliability and the accuracy of the intelligent power grid are greatly improved.

Table 1 comparison table of contact performance between remote transmission density relay of this patent technology and remote transmission density relay of prior art

In addition, the mechanical part shell of the remote transmission density relay is filled with shockproof liquid, an outgoing line sealing piece is further arranged in the mechanical part shell, and a connecting line of the temperature sensor 3 is connected with the intelligent processor through the outgoing line sealing piece. The gas density relay further comprises a device connection 1010, which is arranged on the mechanical part or the electronic part. The density relay outputs a contact signal via a signal generator 109. The communication module 4 is arranged at the shell of the electronic part or the shell of the mechanical part, or the communication module and the intelligent processor are integrally designed together. The pressure sensor is arranged in the electronic part shell or the mechanical part shell. The intelligent processor automatically controls the whole monitoring process based on an embedded algorithm and a control program of an embedded system of the microprocessor, and comprises all peripherals, logic, input and output. The intelligent processor automatically controls the whole monitoring process based on embedded algorithms and control programs of a general computer, an industrial personal computer, an ARM chip, an AI chip, a CPU, an MCU, an FPGA, a PLC and the like, an industrial control mainboard, an embedded main control board and the like, and comprises all peripherals, logics, input and output. The density relay also comprises a movement, a pointer and a dial, and is provided with a value display or a digital display device which is provided with a value display.

The intelligent processor collects pressure signals and temperature signals of the pressure sensor and the temperature sensor, and converts the pressure signals and the temperature signals into a pressure value P of 20 ℃ according to gas characteristics₂₀(i.e. density value P)₂₀). The gas density relay can convert the measured pressure value and temperature value into a pressure value P corresponding to 20 ℃ according to gas characteristics₂₀Namely, the gas density relay has the functions of pressure and temperature measurement and software conversion. The intelligent processor may measure relative pressure and absolute pressure type density relays. The gas density relay has a man-machine interaction function: the data display interface is provided, and the current data value can be refreshed in real time; the device has a data input function and can input parameter set values. The intelligent processor is provided with an interface and can finish test data storage; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The electrical interface of the density relay has a protection function, and the interface cannot be damaged due to misconnection; or/and will not be disturbed by electromagnetic fields. The intelligent processor also comprises a communication module, and the information such as test data and/or results is transmitted in a long distance through the communication module. The communication module may be disposed on the electronics housing, or on the mechanical housing. The communication mode of the communication module can be a wired mode or a wireless mode. The gas density relay further comprises a multi-pass joint, and an electronic part of the gas density relay is arranged on the multi-pass joint. The gas density relay also comprises a multi-way joint and a self-sealing valve, and the electronic part and the self-sealing valve are arranged on the multi-way joint. The pressure detector and the pressure sensor are connected together through a connecting pipe. The electronic part is arranged behind the shell of the mechanical part of the gas density relay or on the shell or on the equipment connecting joint. The intelligent processor also comprises a clock, wherein the clock is arranged on the intelligent processor and can record the test time. The power supply (power module) also comprises a power supply circuit, or a battery, or can be circularly chargedAn electric battery, solar energy, a power supply obtained by electricity obtained by a mutual inductor, an induction power supply and the like. The control of the intelligent processor can be completed through field control, background control or mutual interaction of the field control and the background control. The gas density relay has the functions of real-time online density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like. The circuit of the intelligent processor comprises a protection component, in particular an anti-interference component. The gas density relay also comprises a micro-water sensor which can monitor the gas micro-water value on line. The gas density relay also comprises a decomposition product sensor which can monitor gas decomposition products on line. The gas density relay has a self-diagnosis function and can inform abnormality in time. Such as a wire break, short alarm, sensor damage, etc. When the density of the gas density relay monitors that the gas pressure has a rising trend on line, an abnormal notice should be put forward in time. The gas density relay also comprises a camera for monitoring the gas density relay. The gas density relay has protection to the environmental temperature of the electronic components, prevents the electronic components from working at too low temperature or too high temperature and enables the electronic components to work in an allowable temperature range. A heater and/or a radiator (fan) can be arranged, the heater is started at low temperature, and the radiator (fan) is started at high temperature, so that the pressure sensor and/or the integrated circuit and other electronic elements can reliably work in low-temperature or high-temperature environments. The gas density relay has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment and the density relay. The pressure detector is a bourdon tube or a corrugated tube; the temperature compensation element is a bimetallic strip or a sealed air chamber sealed with compensation gas; the signal generators are microswitches or magnetic auxiliary electric contacts.

Fig. 4 is a gas density monitoring system consisting of a high-performance remote gas density relay, as shown in fig. 4, comprising: the high-voltage electrical equipment with the sulfur hexafluoride gas chamber and the high-performance remote transmission gas density relays are connected with the remote background detection system sequentially through the concentrator and the protocol converter; the high-performance remote transmission gas density relays are respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chambers.

Gas density monitoring system, comprising of a high performance remote gas density relay, comprising: a plurality of high-voltage electrical equipment provided with sulfur hexafluoride gas chambers and a plurality of high-performance remote transmission gas density relays are connected with a remote background detection system through a concentrator and an IEC61850 protocol converter in sequence; the high-performance remote transmission gas density relays are respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chambers.

As shown in fig. 4 and 5, the PC is an online monitoring background host and system, the Gateway is a network switch, the Server is an integrated application Server, the ProC is a protocol converter/online monitoring intelligent unit, the HUB is a concentrator, and Z is a high-performance remote gas density relay. The online monitoring system architecture: the system diagrams of the simple architecture (fig. 4), the conventional architecture (fig. 5), the complex architecture, and the like are detailed. System architecture diagram and brief description: 1. a background software platform: based on Windows, Linux, and the like, or VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS, MacOS. 2. Background software key business module, basic function: such as rights management, device management, data storage queries, etc.; and user management, alarm management, real-time data, historical data, real-time curves, historical curves, configuration management, data acquisition, data analysis, recording conditions, and exception handling. 3. Interface configuration: such as Form interface, Web interface, configuration interface, etc. The monitoring system can also be an architecture system diagram in a wireless transmission mode, a wireless module and a high-performance remote transmission gas density relay can be integrated or separated, and the specific scheme can be flexible.

This monitoring system can real-time supervision circuit breaker, the inside SF6 gaseous temperature of electrical equipment such as GIS, pressure, density, physical quantity such as little water and its trend of change, and have communication interface, upload background system with data, realize the circuit breaker, the online monitoring function of physical quantity such as electric equipment SF6 gaseous density such as GIS, little water, and can set for the warning limit in a flexible way, inquire historical data on the spot, accurate analysis judges equipment gas leakage trend and gas leakage rate, discover abnormal conditions in advance to equipment, thereby guarantee the safe operation of electrical equipment and the whole system of transformer substation. The on-line monitoring of the electrical equipment of the transformer substation, especially an unattended station, is really realized. The method plays an important role in improving the safe operation and operation management level of a power grid system, developing prospective diagnosis and trend analysis and reducing unplanned power failure maintenance.

The gas density monitoring system comprises high-performance remote gas density relays, and the communication modes of the high-performance remote gas density relays are wired or wireless. Wired communication modes comprise industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carriers and the like; the wireless communication mode is that the sensor embeds 5G/NB-IOT communication module (for example 5G, NB-IOT), 2G/3G/4G/5G etc. WIFI, bluetooth, Lora, loraan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar etc. upload various sensor data to thing networking cloud platform. The hub adopts an RS485 hub, and the IEC61850 protocol converter is also respectively connected with the network service printer and the network data router.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A medium-high voltage electrical equipment gas leak monitor comprising: the intelligent microprocessor, the pressure sensor and the temperature sensor; the pressure sensor is communicated with a gas path of the gas density monitor, and the intelligent microprocessor is respectively connected with the temperature sensor and the pressure sensor; the intelligent microprocessor collects pressure signals through the pressure sensor and temperature signals through the temperature sensor according to the set sampling frequencyAccording to the gas pressure-temperature characteristic, the corresponding density value P is obtained through the operation processing of an intelligent microprocessor₂₀(ii) a The intelligent microprocessor is characterized in that the intelligent microprocessor is provided with gas leakage notification information of the monitored medium-high voltage electrical equipment, wherein the gas leakage notification information comprises but is not limited to one or more of gas leakage amount, gas leakage rate, gas leakage value and gas leakage degree of the electrical equipment; alternatively, the first and second electrodes may be,

the intelligent microprocessor has leakage notification information of the monitored middle-high voltage electrical equipment, namely according to the set leakage alarm density value P_{20 air leakage alarm}When the monitored density value P₂₀Equal to or less than leakage alarm density value P_{20 air leakage alarm}When the alarm is started, the monitor sends out an air leakage alarm signal or uploads air leakage notification information.

2. The medium-high voltage electrical equipment gas leak monitor according to claim 1, wherein the gas leak monitor further comprises a communication module or/and a memory.

3. Medium-and high-voltage electrical equipment gas leakage monitor according to claim 1, characterized in that said intelligent microprocessor derives the corresponding density value P₂₀Carrying out depth calculation processing, wherein the depth calculation processing comprises the following steps: the intelligent microprocessor calculates and processes the detected gas density value by adopting an average value method to obtain a gas density value P₂₀Average value P of_{20 average}The average value P_{20 average}Is the exact density value P_{20 is accurate}。

4. The medium-high voltage electrical equipment gas leak monitor according to claim 3, wherein the average value method is: setting collection frequency in a set time interval, and carrying out average calculation processing on N density values of different collected time points to obtain a gas density value P₂₀Average value P of_{20 average}To obtain accurate density value P_{20 is accurate}(ii) a Alternatively, the first and second electrodes may be,

is adopted inSetting temperature interval step length in a set time interval, and carrying out average calculation processing on N density values of different temperature values acquired in all temperature ranges to obtain a gas density value P₂₀Average value P of_{20 average}To obtain accurate density value P_{20 is accurate}(ii) a Alternatively, the first and second electrodes may be,

setting pressure interval step length in a set time interval, and carrying out average value calculation processing on N density values of different pressure values acquired in all pressure variation ranges to obtain a gas density value P₂₀Average value P of_{20 average}To obtain accurate density value P_{20 is accurate}。

5. The medium-high voltage electrical equipment gas leak monitor according to claim 3, wherein the depth calculation process is: the intelligent microprocessor is used for controlling the gas density value P at certain intervals₂₀Fourier transform is carried out, the frequency spectrum is converted into corresponding frequency spectrum, periodic components are filtered out, and then accurate density value P is obtained through calculation_{20 is accurate}。

6. The medium-high voltage electrical equipment gas leak monitor according to claim 3, wherein the depth calculation process is: the intelligent microprocessor decomposes the components into trend, periodicity and random components according to the time sequence, and judges the gas leakage condition according to the trend components.

7. The medium-high voltage electrical equipment gas leakage monitor according to claim 2 or 6, wherein the intelligent microprocessor judges that gas is leaked when detecting that the trend component value is equal to or greater than the set trend component value according to the set trend component value, and sends an alarm signal or alarm information; the alarm signal is uploaded to target equipment through a signal wire; and/or the alarm information is uploaded to target equipment or a target platform through a communication module.

8. According toMedium-high voltage electrical equipment gas leakage monitor according to claim 1 or 2, characterised in that said accurate density value P_{20 is accurate}Density value P₂₀And the corresponding pressure value and the corresponding temperature value are uploaded to the target equipment or the target platform through the communication module, so that the gas density value of the electrical equipment can be monitored accurately and online comprehensively.

9. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, wherein the intelligent microprocessor performs data analysis, judgment and data storage, and gives a corresponding alarm signal according to a set alarm strategy.

10. The medium-high voltage electrical equipment gas leak monitor according to claim 1 or 9, wherein the intelligent microprocessor monitors the gas density value P of the electrical equipment at set time intervals₂₀The trend change value DeltaP of₂₀Lower or higher than the set trend change value DeltaP_{20 set}When the alarm is started, the monitor sends out an alarm signal and/or an alarm signal contact and/or alarm information; or upload announcement information.

11. Medium-high voltage electrical equipment gas leakage monitor according to claim 10, characterized in that said trend variation value Δ P₂₀Comprises the following steps: setting collection frequency in set time interval, calculating average value of density values of different time points to obtain gas density value P₂₀Average value P of_{20 average}Then, a trend calculation period T is set_{Period of time}Obtaining a trend change value delta P₂₀＝P_{20 average (previous T period value)}-P_{20 average (T period)}I.e. the mean value P_{20 average}Front-back period T_{Period of time}A difference of (d); alternatively, the first and second electrodes may be,

12. Medium-high voltage electrical equipment gas leakage monitor according to claim 1 or 4, wherein said smart microprocessor calculates the gas leakage rate L ═ Δ P of the electrical equipment being monitored_20t/t＝(P_{20 is accurate}t_{Front side}-P_{20 accurate t}. ) T, in the formula: t is a set time interval, Δ P_20tIs the variation of density value, P, in time interval t_{20 is accurate}t_{Front side}Is the density value, P, of the moment before the time interval t_{20 is accurate}t is the density value after the time interval t. The monitor updates the information for giving out the air leakage rate L notification in time; or upload the updated leakage rate L notification information in time.

13. The medium-high voltage electrical equipment gas leak monitor according to claim 12, wherein the monitor issues a gas leak alarm signal when the monitored trending component value is equal to or greater than the set trending component value, based on the set trending component value; or send out the leak alarm signal contact; or sending out air leakage notification information; or uploading leakage notification information; alternatively, the first and second electrodes may be,

according to the set air leakage rate L_{Setting up}When the monitored air leakage rate L is equal to or greater than the set air leakage rate L_{Setting up}When the alarm is in use, the monitor sends out an air leakage alarm signal; or send out the leak alarm signal contact; or sending out air leakage notification information; or upload air leak notification information.

14. The medium-high voltage electrical equipment gas leakage monitor according to claim 1 or 4, wherein the intelligent microprocessor calculates the gas leakage Q of the monitored electrical equipment_L，Q_L＝Q_{First stage}-Q_{At present, the method}＝ρ_{First stage}*V-ρ_{At present, the method}V; in the formula: rho_{First stage}For calculating the gas mass density at the initial stage of the gas leakage, ρ_{At present, the method}The current gas mass density is V, and the volume of a gas chamber of the electrical equipment is V; according to the gas density value P at the initial stage of calculating the gas leakage amount_{20 at the beginning}And its gas properties to obtain mass density rho_{First stage}(ii) a According to the currently detected density value P₂₀And its gas properties to obtain mass density rho_{At present, the method}。

15. The medium-high voltage electrical equipment gas leak monitor according to claim 1 or 12, wherein the intelligent microprocessor is configured to determine the gas leak rate L and the gas leak time T according to the gas leak rate L_LAnd calculating to obtain the gas leakage Q of the monitored electrical equipment_L。

16. The medium-high voltage electrical equipment gas leak monitor according to claim 14 or 15, wherein the intelligent microprocessor performs deep calculation to obtain an annual gas leak Q including but not limited to electrical equipment gas_LYSeasonal air leakage Q_LQMonthly air leakage Q_LMPeripheral leakage Q_LWDaily air leakage Q_LDOne or more of them.

17. Medium-high voltage electrical equipment gas leakage monitor according to claim 1 or 4, characterized in that said intelligent microprocessor calculates the gas leakage value Δ P of the monitored electrical equipment_20L，△P_20L＝P_{20 accurate initial point}-P_{20 accurate current}In the formula: p_{20 accurate initial point}Is an initial accurate gas density value, P_{20 accurate current}The current accurate gas density value; alternatively, the first and second electrodes may be,

18. The medium-high voltage electrical equipment gas leak monitor according to claim 1, wherein the intelligent microprocessor classifies the gas leak into one or more of serious gas leak, moderate gas leak, slight gas leak and micro gas leak according to the degree of the gas leak.

19. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, wherein the degree of gas leakage is graded according to one or more of the group including, but not limited to, gas leakage rate, amount of gas leakage, and value of gas leakage.

20. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, wherein the intelligent microprocessor has a gas supplement control function for the monitored electrical equipment, and the gas supplement is required to be performed according to a set density value P_{20 air supplement}When the monitored density value P_{20 is accurate}Is equal to or less than density value P_{20 air supplement}When the air is supplied, the monitor sends an air supply alarm signal; or send out the alarm signal contact of tonifying qi; or sending out the air replenishing notification information; or upload the air supplement notification information.

21. According to claim 20, the medium-high voltage electrical equipment gas leakage monitor is characterized in that the intelligent microprocessor sends out notification information to the gas supply time of the monitored electrical equipment; according to the set density value P of air supplement_{20 air supplement}Time of air supply T_{Time of air supply}＝(P_{20 is accurate}-P_{20 air supplement}) The monitor updates the notification information of the air supply time in time; or updating and uploading the air replenishing time information in time.

22. The medium-high voltage electrical equipment gas leak monitor according to claim 20, wherein the intelligent microprocessor has a function of informing the quality of gas supply to the monitored electrical equipment according to the set value P of the density of gas supply required_{20 air supplement}The volume V of the air chamber of the electrical equipment is calculated to obtain the gas supply quality Q_{Air supplement}Gas-supplementing quality Q emitted by monitor_{Air supplement}Information; or uploading gas for supplementing qi quality Q_{Air supplement}And (4) information.

23. The medium-high voltage electrical equipment gas leak monitor of claim 22, wherein the intelligent microprocessor is configured to provide gas make-up quality Q_{Air supplement}The calculation method comprises the following steps: density value P of air supplement according to need_{20 need to}According to the value P of the density of the make-up gas_{20 need to}And its gas properties to obtain mass density rho_{Need to make sure that}The total required gas mass Q of the gas chamber of the electrical equipment can be known_{General assembly}＝ρ_{Need to make sure that}V; and the currently detected density value P₂₀According to the currently detected density value P₂₀And its gas properties to obtain mass density rho_{At present, the method}It can be known that the current gas mass Q of the gas chamber of the electrical equipment is rho_{At present, the method}V; thus, Q can be obtained_{Air supplement}＝Q_{General assembly}-Q is currently. Monitor for timely updating gas supply quality Q_{Air supplement}Notification information; or timely updating the gas-supplying quality Q_{Air supplement}And (4) information.

24. The medium-high voltage electrical equipment gas leak monitor according to claim 13, wherein the smart microprocessor corrects the time interval value t set by the gas leak rate L.

25. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, further comprising an electronic notification signal contact for indicating when the gas pressure or temperature value of the monitored electrical equipment is lower or higher than the set pressure value P_{Setting up}Or a temperature value T_{Setting up}When the monitor is started, the monitor outputs a notification signal contact; alternatively, the first and second electrodes may be,

26. The medium-high voltage electrical equipment gas leak monitor according to claim 25, wherein the electronic signal contacts include, but are not limited to, one or more of electromagnetic relays, solid state relays, time relays, power relays, thyristors, electronic switches, electrical contacts, optocouplers, DI, MOS FETs, triodes, diodes, MOS FET relays.

27. The medium-high voltage electrical equipment gas leak monitor according to claim 1, wherein the set value can be modified and stored on-line.

28. The medium-high voltage electrical equipment gas leak monitor according to claim 1, wherein the density monitor is capable of inputting gas make-up or/and bleed test events and performing a gas density value P based on the corresponding gas make-up or/and bleed test events₂₀New calculations or adjustments.

29. The medium-high voltage electrical equipment gas leak monitor of claim 1, wherein said intelligent microprocessorThe gas density value P is monitored in a certain short time₂₀Gradually increasing to judge the gas supplementing event, and according to the maximum gas density value P monitored at that time₂₀Judging that the gas supplementing event is ended, and carrying out gas density value P_{20 is accurate}New calculations or adjustments.

30. The medium-high voltage electrical equipment gas leak monitor according to claim 1, wherein the smart microprocessor monitors the gas density value P for a short period of time₂₀Gradually and slightly dropping, the gas discharge test, the micro water or the decomposition event can be judged, and the gas discharge test, the micro water or the decomposition event can be carried out according to the minimum gas density value P monitored at the time₂₀If so, judging that the air discharge test event is ended, and carrying out gas density value P₂₀Accurate new calculations or adjustments.

31. Medium-high voltage electrical equipment gas leak monitor according to claim 29 or 30, characterized in that the smart microprocessor of the density monitor records the gassing, or/and gassing test events, and the time, number and gas quality information.

32. The medium-high voltage electrical equipment gas leak monitor according to claim 1, wherein the gas density monitor further comprises a display unit with gas leak and/or indication display.

33. The medium-high voltage electrical equipment gas leak monitor of claim 1, wherein the gas density monitor further comprises a mechanical control section, the mechanical section comprising: the device comprises a pressure detector, a temperature compensation element, a plurality of signal generators and a signal adjusting mechanism.

34. The medium-high voltage electrical equipment gas leak monitor of claim 1, further comprising a movement, a pointer, a dial, with a density indication display.

35. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, wherein the gas density monitor further comprises a micro water sensor for online monitoring of a micro water value of the gas, and when the micro water value exceeds a set value, the monitor sends out a micro water exceeding notification message; or uploading micro-water exceeding notification information.

36. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, wherein the gas density monitor further comprises a decomposed substance sensor for on-line monitoring of the decomposed substance of the gas, and when the content of the decomposed substance exceeds a set value, the monitor sends out a notice that the content of the decomposed substance exceeds a standard; or uploading the information of the notice that the content of the decomposition products exceeds the standard.

37. The medium-high voltage electrical equipment gas leakage monitor according to claim 1 or 34, wherein the gas leakage monitor connects the monitored data and information thereof to a signal generator or a dedicated line in parallel or in series through an output electronic signal contact, and uploads the data and information thereof through regular coding; the uploaded data specifically relates to one or more of monitored gas leakage amount, gas leakage rate, gas leakage value, gas leakage degree, density value, pressure value, temperature value, density value of electrical equipment, over-low density value, gas leakage, over-high pressure, over-high temperature, pressure of a gas density monitor, abnormal information of a temperature sensor and self-diagnosis result of the monitor.

38. The medium-high voltage electrical equipment gas leak monitor according to claim 33, wherein the temperature sensor is disposed in the vicinity of a temperature compensation element of the gas density monitor.

39. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, wherein the intelligent microprocessor automatically controls the whole process based on one or more of general purpose computer, industrial personal computer, ARM chip, AI chip, CPU, MCU, FPGA, PLC, industrial control motherboard, and embedded main control board, embedded algorithm and control program, including all peripherals, logic, and input/output.

40. The medium-high voltage electrical equipment gas leak monitor of claim 37, wherein the density monitor output annunciation signal contacts are connected in parallel or in series to a number of signal generators; alternatively, the first and second electrodes may be,

41. Medium-high voltage electrical equipment gas leak monitor according to claim 1, characterized in that the smart microprocessor of the gas density monitor has an IO interface: the test data is stored, exported and printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input.

42. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, wherein the electrical interface of the density monitor is an anti-misconnection protection interface, or an anti-electromagnetic interference interface.

43. The medium-high voltage electrical equipment gas leak monitor according to claim 2, wherein the intelligent microprocessor realizes remote transmission of test data and/or condition monitoring result information through the communication module.

44. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, wherein the gas density monitor further comprises an expert management analysis system for performing detection analysis and judgment on the gas density monitor, the equipment gas leakage, the performance of the gas density monitor and the monitoring element.

45. The medium-high voltage electrical equipment gas leak monitor according to claim 1, wherein the pressure sensor and the temperature sensor are of an integrated structure.

46. The medium-high voltage electrical equipment gas leak monitor according to claim 1, wherein the density monitor further comprises an electric field shield disposed outside the pressure sensor and/or the electronics section.

47. The medium-high voltage electrical equipment gas leak monitor according to claim 1, wherein the density monitor further comprises a magnetic field shield disposed outside the pressure sensor and/or the electronics section.

48. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, wherein the electronic part of the density monitor further comprises a shield capable of shielding electric fields, or magnetic fields, or both.

49. The medium-high voltage electrical equipment gas leak monitor according to claim 1, wherein the control of the intelligent microprocessor is accomplished in the field, in the background, or by interaction of the two.

50. The medium-high voltage electrical equipment gas leakage monitor according to claim 1, further having functions of real-time online density value, pressure value, temperature value and other data display, variation trend analysis, historical data query, real-time alarm and the like.

51. The medium-high voltage electrical equipment gas leak monitor according to claim 1, further comprising a plurality of insulating members by which the pressure sensor is insulated from its housing, mechanical part housing and equipment connection joint; or the housing of the pressure sensor and the housing of the gas density monitor are insulated.

52. The medium-high voltage electrical equipment gas leakage monitor according to claim 3 or 4, wherein the depth calculation process is: the intelligent microprocessor has the function of calculating accurate density values P of a plurality of different time intervals_{20 is accurate}(ii) a Or having the calculation of gas leakage over a plurality of different periods; or having the gas leak rate calculated for a plurality of different periods; or having the gas leak values calculated for a plurality of different time periods; or with calculation of gas leakage levels at a plurality of different times.

53. The medium-high voltage electrical equipment gas leak monitor of claim 52 in which the accurate density values P for the plurality of different time intervals are_{20 is accurate}Or/and the gas leakage amount or/and the gas leakage rate are uploaded to the target equipment or the target platform through the communication module, and then the gas density of the electrical equipment is monitored more accurately on line.

54. A monitoring system comprised of said medium and high voltage electrical equipment gas leak monitor, comprising: the middle-high voltage electrical equipment gas leakage monitors are connected with the remote background detection system sequentially through the concentrator and the protocol converter; wherein, the gas leakage monitors of the medium-high voltage electrical equipment are respectively arranged on the electrical equipment of the corresponding insulating gas chamber.

55. A monitoring system having a medium to high voltage electrical equipment gas leak monitor composition according to claim 54, comprising: the middle-high voltage electrical equipment gas leakage monitors are connected with the remote background detection system through the concentrator, the IEC61850 or the IEC104 protocol converter in sequence; wherein, the gas leakage monitors of the medium-high voltage electrical equipment are respectively arranged on the electrical equipment of the corresponding insulating gas chamber.

56. A monitoring system consisting of a gas leakage monitor for medium and high voltage electrical equipment according to claim 54, wherein the hub is an RS485 hub and the IEC61850 protocol converter or the IEC104 protocol converter is further connected to the network service printer and the network data router, respectively.

57. The monitoring system of claim 56, wherein the monitoring system has data display, trend analysis, historical data query, real-time alarm function and data analysis, data processing capability including, but not limited to, gas leakage amount, gas leakage rate, gas leakage value, gas leakage degree, real-time on-line density value, pressure value, temperature value, etc., and provides technical support for the condition maintenance of the electrical equipment.