CN117590163A - Oil paper insulating sleeve oil shortage and leakage detection and oil leakage height positioning method and system - Google Patents
Oil paper insulating sleeve oil shortage and leakage detection and oil leakage height positioning method and system Download PDFInfo
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Abstract
The invention discloses a method and a system for detecting oil shortage and oil leakage and positioning the oil leakage height of an oil paper insulating sleeve, which relate to the technical field of insulating state detection of electric power equipment and comprise the steps of collecting pressure data and drawing a pressure change curve; judging the running state of the transformer bushing; and judging the oil level state according to the pressure change trend. The oil leakage detection and oil leakage height positioning method for the oil paper insulating sleeve provided by the invention can intuitively and rapidly find the oil leakage shortage phenomenon of the transformer sleeve, solves the defects that the existing manual inspection period is long and faults cannot be found in time, can accurately lock oil leakage positions remotely, increases the safety risk of inspection work, facilitates the selection of an optimal repair scheme, saves manpower and material resources, and has better effects in the aspects of detection period, safety risk and accuracy.
Description
Technical Field
The invention relates to the technical field of detection of an insulating state of electric power equipment, in particular to a method and a system for detecting oil shortage and oil leakage and positioning the oil leakage height of an oil paper insulating sleeve.
Background
At present, detection of oil leakage failure of a sleeve is still mainly dependent on manual inspection, however, a series of inconveniences exist in the traditional detection method. First, the period of this method is relatively long, requiring periodic inspection, which can lead to hysteresis in the test results, delaying problem discovery and handling. Secondly, the sleeve pipe is located transformer's eminence or other difficult to accessible positions generally for patrol and examine work is more loaded down with trivial details and dangerous, and artifical patrol and examine personnel and need climb up or use equipment such as hanging flower basket, have increased the security risk. However, with the continuous progress of technology, a more efficient and accurate method for detecting the oil leakage failure of the sleeve has been developed, namely, the oil leakage failure is detected by monitoring the pressure change condition inside the sleeve. This approach has significant advantages. Firstly, when oil leakage occurs in the casing, oil loss will cause the oil pressure in the equipment to drop significantly, and the pressure change can be monitored in real time by a pressure sensor and other devices, so that the problem can be perceived quickly in an early stage. And secondly, the method has excellent anti-interference capability, is not interfered by external environment factors, and is more reliable compared with the traditional inspection method. In addition, the height and the position of the oil leakage point can be accurately calculated by analyzing the pressure change rule, precious information is provided for repairing work, the best repairing scheme is selected, and the maintenance efficiency is improved.
Oil-starved faults in oil-paper bushing transformers can lead to reduced oil levels in the transformer, which can cause overheating, overload, and electrical failure of the equipment. These faults may damage not only the transformer itself but also other electrical equipment connected thereto, leading to instability of the power supply system and even to a power outage. Therefore, it is very important to find an effective oil-starved fault detection method to prevent and timely treat the oil-starved problem.
Disclosure of Invention
The present invention has been made in view of the above-described problems.
Therefore, the technical problems solved by the invention are as follows: the existing oil paper insulating sleeve oil-missing fault detection method has the problems of longer detection period, lower reliability and lower safety, and optimization of how to accurately determine the height and the position of an oil-missing point.
In order to solve the technical problems, the invention provides the following technical scheme: a method for detecting oil shortage and leakage of an oil paper insulating sleeve and positioning the height of oil leakage comprises the steps of collecting pressure data and drawing a pressure change curve; judging the running state of the transformer bushing; and judging the oil level state according to the pressure change trend.
As a preferable scheme of the oil paper insulating sleeve oil shortage detection and oil leakage height positioning method, the invention comprises the following steps: the wireless monitoring system comprises a pressure sensor, a data acquisition unit, a communication unit, a power supply unit and a receiving unit, wherein the pressure sensor is used for taking an oil port of a transformer sleeve, the pressure value inside the transformer sleeve is measured, the data acquisition unit is used for collecting data from the pressure sensor and converting analog signals into digital signals, the communication unit is used for transmitting the acquired pressure data to a remote receiver, the wireless technology is used for transmitting the data in real time, the receiving unit is used for receiving the pressure data and drawing a real-time pressure curve, and the power supply unit is used for providing a battery and a power adapter for the unit so that the wireless monitoring system can continuously operate with a stable power supply.
As a preferable scheme of the oil paper insulating sleeve oil shortage detection and oil leakage height positioning method, the invention comprises the following steps: the wireless monitoring system comprises communication fault processing and low-power processing, when the proportion of the communication unit which can not transmit data to the receiving unit or the lost data exceeds a preset proportion, the communication connection is re-established, if the connection is failed to be established, the data storage is switched to a standby network or satellite communication and a communication fault alarm is sent to maintenance personnel for manual diagnosis, and when the communication is recovered, the stored data is retransmitted to the receiving unit; when the power supply unit detects that the battery power is lower than the preset power, the power supply unit is automatically switched to a low power consumption mode to prolong the service time, a low battery power alarm is generated for maintenance personnel, the residual power is provided, and the data transmission frequency of the communication unit is suspended or reduced according to the battery condition.
As a preferable scheme of the oil paper insulating sleeve oil shortage detection and oil leakage height positioning method, the invention comprises the following steps: the operation state of the transformer bushing comprises ascending, descending and up-and-down fluctuation, when the pressure is changed, if the pressure is continuously ascending, discharging or overheating faults exist in the bushing, the system is informed to reduce the load of the transformer, the working load of the bushing is reduced, the pressure is reduced, or a cooling device is started, the temperature of the bushing is reduced, the pressure is lightened, if the pressure is continuously descending, the bushing is in an oil leakage state, the oil level state is continuously judged, the system is informed to trigger a sealing mechanism, the oil leakage speed is slowed down, if the pressure is fluctuated up and down, the bushing is in a normal operation state, the bushing is continuously monitored through a wireless monitoring system, and the fluctuation modes are analyzed and classified to distinguish the fluctuation caused by normal fluctuation and potential problems.
As a preferable scheme of the oil paper insulating sleeve oil shortage detection and oil leakage height positioning method, the invention comprises the following steps: the oil level state comprises that the pressure is re-raised to be stable after being reduced to a preset point, the oil level is re-raised after being reduced to the preset point, the oil level is lower than an oil leakage point, the insulating oil is not leaked, the oil pressure is recovered to a standard atmospheric pressure, the oil pressure is recovered to the standard atmospheric pressure after the pressure is kept stable, and P Air flow The insulating oil inside the sleeve is distributed in the space between the porcelain sleeve and the capacitor core and is equal to the standard atmospheric pressureThe volume of insulating oil is calculated as a hollow cylinder, and the measured pressure P of the pressure sensor is expressed as:
P＝P air flow +P Oil (oil) ＝101.3kPa+mgh＝101.3kPa+ρ·(R 2 -r 2 )·π·h
Wherein, insulating oil density ρ=0.975 kg/L, R, r is sleeve porcelain bushing inner radius and electric capacity core footpath respectively, and the height h of oil leak point from pressure sensor is calculated and is expressed as:
wherein P takes the steady value of the pressure rise.
As a preferable scheme of the oil paper insulating sleeve oil shortage detection and oil leakage height positioning method, the invention comprises the following steps: the oil level state also comprises that the pressure continuously drops and tends to be stable, the pressure inside and outside the oil leakage point reaches balance, the pressure born by the oil leakage point is equal to a standard atmospheric pressure, the height of the oil leakage point from the pressure sensor is set to be h, the pressure born by the h is 101.3kPa, and the pressure P measured by the pressure sensor is expressed as:
P＝101.3kPa+mgh＝101.3kPa+ρ·(R 2 -r 2 )·π·h
the calculated height h of the oil leakage point from the pressure sensor is expressed as:
wherein, P takes a stable value of continuous pressure drop.
As a preferable scheme of the oil paper insulating sleeve oil shortage detection and oil leakage height positioning method, the invention comprises the following steps: the oil level state judging step comprises the steps of rising again and tending to be stable after the pressure P measured by the pressure sensor is reduced to a preset point, judging that the oil level is lower than an oil leakage point by the system, recording the falling and rising time and amplitude of an oil level falling event when the oil level pressure is gradually recovered to the standard atmospheric pressure, informing maintenance personnel to maintain, and after the oil level is confirmed to be lower than the oil leakage point, increasing the oil level by adding the insulating oil and continuously monitoring the stability of the oil level pressure; when the pressure P measured by the pressure sensor continuously drops and tends to be stable, the system judges that the pressure inside and outside the oil leakage point reaches balance, when the pressure born by the oil leakage point is equal to the standard atmospheric pressure, the system records the dropping time and amplitude of the continuous drop event of the oil level, informs maintenance personnel to carry out maintenance, supplements the emergency oil level, prevents continuous leakage, monitors the stability of the oil level, redistributes the insulating oil and reaches a preset stable state, and immediately stops the operation of the transformer if the oil level continuously drops and cannot be repaired in time.
Another object of the present invention is to provide a system for detecting oil shortage and locating oil leakage height of an oil paper insulating sleeve, which can collect pressure data inside the sleeve in real time through a pressure sensor by a pressure data collecting module, digitize the pressure data and transmit the pressure data to an upper computer, thereby realizing remote monitoring and solving the problem of inconvenience of the traditional manual inspection at present.
As a preferable scheme of the oil paper insulating sleeve oil shortage detection and oil leakage height positioning system, the invention comprises the following steps: the device comprises a pressure data acquisition module, an operation state judgment module and an oil level state judgment module; the pressure data acquisition module is used for acquiring pressure data in the sleeve in real time, transmitting the pressure data to the upper computer for processing, and drawing a pressure change curve; the operation state judging module judges whether the operation state of the transformer bushing has faults or abnormal conditions according to the pressure data; and the oil level judging module calculates the height of the oil leakage point from the pressure sensor according to different conditions and determines the oil level state.
A computer device comprising a memory and a processor, said memory storing a computer program, characterized in that execution of said computer program by said processor is the step of performing the oilpaper bushing oil-leak detection and oil-leak height location method.
A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of a oilpaper bushing oil-missing detection and oil-missing height positioning method.
The invention has the beneficial effects that: the oil leakage detection and oil leakage height positioning method for the oil paper insulating sleeve provided by the invention can intuitively and rapidly find the oil leakage shortage phenomenon of the transformer sleeve, solves the defects that the existing manual inspection period is long and faults cannot be found in time, can accurately lock oil leakage positions remotely, increases the safety risk of inspection work, facilitates the selection of an optimal repair scheme, saves manpower and material resources, and has better effects in the aspects of detection period, safety risk and accuracy.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without the need of creative efforts for a person of ordinary skill in the art. Wherein:
fig. 1 is an overall flowchart of a method for detecting oil shortage and locating an oil leakage height of an oil paper insulating sleeve according to a first embodiment of the present invention.
Fig. 2 is a graph of pressure change under oil leakage fault of an oil paper insulating sleeve oil leakage detection and oil leakage height positioning method according to a second embodiment of the present invention.
Fig. 3 is an overall flowchart of an oil paper insulation sleeve oil shortage detection and oil leakage height positioning system according to a third embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
While the embodiments of the present invention have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, for one embodiment of the present invention, there is provided a method for detecting oil shortage and locating an oil leakage height of an oil paper insulating sleeve, including:
s1: pressure data are collected and a pressure change curve is drawn.
Still further, collecting pressure data includes a wireless monitoring system.
It should be noted that, the wireless monitoring system is by pressure sensor, data acquisition unit, communication unit, power supply unit and receiving unit, through the pressure sensor at the transformer bushing oil pick-up mouth, measure the inside pressure value of transformer bushing, collect data from pressure sensor through data acquisition unit, convert analog signal into digital signal, communication unit transmits the pressure data who gathers to remote receiver, make data real-time transmission using wireless technology, receiving unit receives pressure data and draws real-time pressure curve, power supply unit provides battery and power adapter for the unit and makes wireless monitoring system with stable power continuous operation.
Still further, the wireless monitoring system includes communication fault handling and low battery handling.
It should be noted that, when the proportion of the data which cannot be transmitted to the receiving unit or is lost exceeds the preset proportion, the communication connection is re-established, if the connection is failed to be established, the data storage is switched to the standby network or satellite communication and a communication fault alarm is sent to a maintainer for manual diagnosis, and when the communication is recovered, the stored data is retransmitted to the receiving unit; when the power supply unit detects that the battery power is lower than the preset power, the power supply unit is automatically switched to a low power consumption mode to prolong the service time, a low battery power alarm is generated for maintenance personnel, the residual power is provided, and the data transmission frequency of the communication unit is suspended or reduced according to the battery condition.
S2: and judging the running state of the transformer bushing.
Further, the transformer bushing operating conditions include rise, fall, and up and down fluctuations.
It should be noted that, when the pressure changes, if the pressure continuously rises, then there is a discharge or overheat fault in the sleeve, the system is notified to reduce the load of the transformer, reduce the working load of the sleeve to reduce the pressure or start the cooling device, reduce the temperature of the sleeve to reduce the pressure, if the pressure continuously drops, the sleeve is in an oil leakage state, continuously judges the oil level state, and notifies the system to trigger a sealing mechanism to slow down the oil leakage speed, if the pressure fluctuates up and down, the sleeve is in a normal running state, continuously monitors the fluctuation mode through the wireless monitoring system, analyzes and classifies the fluctuation mode, and distinguishes the normal fluctuation from the fluctuation caused by the potential problem.
S3: and judging the oil level state according to the pressure change trend.
Further, the oil level state includes a state where the pressure is lowered to a preset point and then raised again to be stable.
It should be noted that, the pressure is re-raised to be stable after decreasing to the preset point, the pressure is re-raised after decreasing to the preset point, the oil level is lower than the oil leakage point, the insulating oil is no longer leaked, the oil pressure is recovered to a standard atmospheric pressure after maintaining the pressure stable, P Air flow Equal to a standard atmospheric pressure, insulating oil inside the sleeve is distributed in the space between the porcelain bushing and the capacitor core, and the insulating oil is regarded as a hollow cylinder when the volume is calculated, and the measured pressure P of the pressure sensor is expressed as:
P＝P air flow +P Oil (oil) ＝101.3kPa+mgh＝101.3kPa+ρ·(R 2 -r 2 )·π·h
Wherein, insulating oil density ρ=0.975 kg/L, R, r is sleeve porcelain bushing inner radius and electric capacity core footpath respectively, and the height h of oil leak point from pressure sensor is calculated and is expressed as:
wherein P takes the steady value of the pressure rise.
Further, the oil level state also includes a state in which the pressure is stabilized after the continuous decrease.
It should be noted that, the oil level state further includes that the pressure continuously drops and tends to be stable, the pressure inside and outside the oil leakage point reaches balance, the pressure born by the oil leakage point is equal to a standard atmospheric pressure, the height of the oil leakage point from the pressure sensor is set to be h, the pressure born by the h is set to be 101.3kPa, and the pressure P measured by the pressure sensor is expressed as:
P＝101.3kPa+mgh＝101.3kPa+ρ·(R 2 -r 2 )·π·h
the calculated height h of the oil leakage point from the pressure sensor is expressed as:
wherein, P takes a stable value of continuous pressure drop.
It should also be noted that by collecting and analyzing pressure data in real time, the oil level state inside the transformer bushing can be monitored in real time, compared with the traditional periodic inspection or manual monitoring, the method can discover the abnormal oil level condition earlier, helps to prevent potential problems, judges the oil level state according to different pressure change trends, including rising and stabilizing after the oil level is lowered and stabilizing after continuous lowering, increases the diversity judgment of the oil level state, can identify possible oil leakage problems more accurately, monitors the oil level state by using a pressure sensor compared with the traditional liquid level sensor, reduces the number and complexity of the sensor, does not need to directly contact with insulating oil, reduces the risk of equipment failure, and can calculate the volume of the insulating oil according to the stable value of the pressure and the density of the insulating oil after the pressure is lowered to a preset point, thereby providing additional information about the distribution of the insulating oil, helping to better understand the working state of the transformer, providing communication fault processing and low processing functions, ensuring the reliable transmission of data and improving the reliability of the system and the continuous stability of the system.
Further, determining the oil level state includes exception handling.
It should be noted that, when the pressure P measured by the pressure sensor falls to a preset point and then rises again and tends to be stable, the system judges that the oil level is lower than the oil leakage point, the insulating oil is no longer leaked, and when the oil level pressure gradually returns to the standard atmospheric pressure, the falling and rising time and amplitude of the oil level falling event are recorded, maintenance personnel are notified to perform maintenance, and after the oil level is confirmed to be lower than the oil leakage point, the oil level is raised by adding the insulating oil, and the stability of the oil level pressure is continuously monitored; when the pressure P measured by the pressure sensor continuously drops and tends to be stable, the system judges that the pressure inside and outside the oil leakage point reaches balance, when the pressure born by the oil leakage point is equal to the standard atmospheric pressure, the system records the dropping time and amplitude of the continuous drop event of the oil level, informs maintenance personnel to carry out maintenance, supplements the emergency oil level, prevents continuous leakage, monitors the stability of the oil level, redistributes the insulating oil and reaches a preset stable state, and immediately stops the operation of the transformer if the oil level continuously drops and cannot be repaired in time.
Example 2
Referring to fig. 2, for one embodiment of the present invention, a method for detecting oil shortage and locating the height of oil leakage of an oil paper insulating sleeve is provided, and in order to verify the beneficial effects of the present invention, scientific demonstration is performed through economic benefit calculation and simulation experiments.
The oil pipe is connected to the flange where the oil leakage point is located, firm connection is ensured, no oil leakage phenomenon exists, the pressure sensor is arranged on the flange, the position of the pressure sensor is ensured to be the same as the oil leakage point, all the connections are ensured to be well sealed, and pressure leakage or interference is avoided.
As can be seen from fig. 2, the pressure curve is firstly reduced and then stabilized at about 101.3kPa, it can be determined that the fault state is that the pressure continuously reduces and tends to be stabilized, the internal and external pressures at the oil leakage point reach equilibrium, the pressure at the oil leakage point is equal to a standard atmospheric pressure, the stable value 101.3kPa after the pressure continuously reduces is taken by P, and the height h of the oil leakage point from the pressure sensor can be calculated to be calculated as follows:
the height h=0 of the oil leakage point from the pressure sensor is consistent with the actually arranged oil leakage point, and the oil leakage detection system and the oil leakage height positioning method for the oil paper insulating sleeve provided by the invention can be used for effectively finding the oil leakage lack phenomenon of the transformer sleeve, accurately locking the position of the oil leakage point, facilitating maintenance personnel to select the optimal repairing scheme and saving manpower and material resources.
Example 3
Referring to fig. 3, for one embodiment of the present invention, a system for detecting oil shortage and leakage height of an oil paper insulating sleeve is provided, which includes a pressure data collecting module, an operation state judging module, and an oil level state judging module.
The pressure data acquisition module is used for acquiring pressure data in the sleeve in real time, transmitting the pressure data to the upper computer for processing, and drawing a pressure change curve; the judging operation state module judges the operation state of the transformer bushing according to the pressure data, and whether a fault or an abnormal condition exists or not; the oil level judging module calculates the height of the oil leakage point from the pressure sensor according to different conditions, and determines the oil level state.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium may even be paper or other suitable medium upon which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like. It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (10)
1. The method for detecting the oil shortage and the oil leakage of the oiled paper insulating sleeve and positioning the height of the leaked oil is characterized by comprising the following steps:
collecting pressure data and drawing a pressure change curve;
judging the running state of the transformer bushing;
and judging the oil level state according to the pressure change trend.
2. The oil-paper insulating sleeve oil-missing detection and oil-leakage height positioning method as claimed in claim 1, wherein: the wireless monitoring system comprises a pressure sensor, a data acquisition unit, a communication unit, a power supply unit and a receiving unit, wherein the pressure sensor is used for taking an oil port of a transformer sleeve, the pressure value inside the transformer sleeve is measured, the data acquisition unit is used for collecting data from the pressure sensor and converting analog signals into digital signals, the communication unit is used for transmitting the acquired pressure data to a remote receiver, the wireless technology is used for transmitting the data in real time, the receiving unit is used for receiving the pressure data and drawing a real-time pressure curve, and the power supply unit is used for providing a battery and a power adapter for the unit so that the wireless monitoring system can continuously operate with a stable power supply.
3. The oil-paper insulating sleeve oil-missing detection and oil-leakage height positioning method as claimed in claim 2, wherein: the wireless monitoring system comprises communication fault processing and low-power processing, when the proportion of the communication unit which can not transmit data to the receiving unit or the lost data exceeds a preset proportion, the communication connection is re-established, if the connection is failed to be established, the data storage is switched to a standby network or satellite communication and a communication fault alarm is sent to maintenance personnel for manual diagnosis, and when the communication is recovered, the stored data is retransmitted to the receiving unit;
when the power supply unit detects that the battery power is lower than the preset power, the power supply unit is automatically switched to a low power consumption mode to prolong the service time, a low battery power alarm is generated for maintenance personnel, the residual power is provided, and the data transmission frequency of the communication unit is suspended or reduced according to the battery condition.
4. The oil-paper insulating sleeve oil-missing detection and oil-leakage height positioning method as claimed in claim 1, wherein: the operation state of the transformer bushing comprises ascending, descending and up-and-down fluctuation, when the pressure is changed, if the pressure is continuously ascending, discharging or overheating faults exist in the bushing, the system is informed to reduce the load of the transformer, the working load of the bushing is reduced, the pressure is reduced, or a cooling device is started, the temperature of the bushing is reduced, the pressure is lightened, if the pressure is continuously descending, the bushing is in an oil leakage state, the oil level state is continuously judged, the system is informed to trigger a sealing mechanism, the oil leakage speed is slowed down, if the pressure is fluctuated up and down, the bushing is in a normal operation state, the bushing is continuously monitored through a wireless monitoring system, and the fluctuation modes are analyzed and classified to distinguish the fluctuation caused by normal fluctuation and potential problems.
5. The oil-paper insulating sleeve oil-missing detection and oil-leakage height positioning method as claimed in claim 1, wherein: the oil level state comprises that the pressure is re-raised to be stable after being reduced to a preset point, the oil level is re-raised after being reduced to the preset point, the oil level is lower than an oil leakage point, the insulating oil is not leaked, the oil pressure is recovered to a standard atmospheric pressure, the oil pressure is recovered to the standard atmospheric pressure after the pressure is kept stable, and P Air flow Equal to a standard atmospheric pressure, insulation inside the sleeveThe oil is distributed in the space between the porcelain bushing and the capacitor core, the volume of the insulating oil is calculated to be regarded as a hollow cylinder, and the measured pressure P of the pressure sensor is expressed as:
P＝P air flow +P Oil (oil) ＝101.3kPa+mgh＝101.3kPa+ρ·(R 2 -r 2 )·π·h
Wherein, insulating oil density ρ=0.975 kg/L, R, r is sleeve porcelain bushing inner radius and electric capacity core footpath respectively, and the height h of oil leak point from pressure sensor is calculated and is expressed as:
wherein P takes the steady value of the pressure rise.
6. The oil-paper insulating sleeve oil-missing detection and oil-leakage height positioning method as set forth in claim 5, wherein: the oil level state also comprises that the pressure continuously drops and tends to be stable, the pressure inside and outside the oil leakage point reaches balance, the pressure born by the oil leakage point is equal to a standard atmospheric pressure, the height of the oil leakage point from the pressure sensor is set to be h, the pressure born by the h is 101.3kPa, and the pressure P measured by the pressure sensor is expressed as:
P＝101.3kPa+mgh＝101.3kPa+ρ·(R 2 -r 2 )·π·h
the calculated height h of the oil leakage point from the pressure sensor is expressed as:
wherein, P takes a stable value of continuous pressure drop.
7. The oil-paper insulating sleeve oil-missing detection and oil-leakage height positioning method as set forth in claim 6, wherein: the oil level state judging step comprises the steps of rising again and tending to be stable after the pressure P measured by the pressure sensor is reduced to a preset point, judging that the oil level is lower than an oil leakage point by the system, recording the falling and rising time and amplitude of an oil level falling event when the oil level pressure is gradually recovered to the standard atmospheric pressure, informing maintenance personnel to maintain, and after the oil level is confirmed to be lower than the oil leakage point, increasing the oil level by adding the insulating oil and continuously monitoring the stability of the oil level pressure;
when the pressure P measured by the pressure sensor continuously drops and tends to be stable, the system judges that the pressure inside and outside the oil leakage point reaches balance, when the pressure born by the oil leakage point is equal to the standard atmospheric pressure, the system records the dropping time and amplitude of the continuous drop event of the oil level, informs maintenance personnel to carry out maintenance, supplements the emergency oil level, prevents continuous leakage, monitors the stability of the oil level, redistributes the insulating oil and reaches a preset stable state, and immediately stops the operation of the transformer if the oil level continuously drops and cannot be repaired in time.
8. A system employing the oil paper insulating sleeve oil shortage detection and oil leakage height positioning method as claimed in any one of claims 1 to 7, characterized in that: the device comprises a pressure data acquisition module, an operation state judgment module and an oil level state judgment module;
the pressure data acquisition module is used for acquiring pressure data in the sleeve in real time, transmitting the pressure data to the upper computer for processing, and drawing a pressure change curve;
the operation state judging module judges whether the operation state of the transformer bushing has faults or abnormal conditions according to the pressure data;
and the oil level judging module calculates the height of the oil leakage point from the pressure sensor according to different conditions and determines the oil level state.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, carries out the steps of the oil paper bushing oil shortage detection and oil leakage height positioning method according to any one of claims 1 to 7.
10. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor carries out the steps of the oilpaper insulation bushing oil shortage detection and oil leakage height positioning method according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311326451.XA CN117590163A (en) | 2023-10-13 | 2023-10-13 | Oil paper insulating sleeve oil shortage and leakage detection and oil leakage height positioning method and system |
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| CN202311326451.XA CN117590163A (en) | 2023-10-13 | 2023-10-13 | Oil paper insulating sleeve oil shortage and leakage detection and oil leakage height positioning method and system |
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