CN210442337U - Mixed insulating gas detection system based on multisensor - Google Patents
Mixed insulating gas detection system based on multisensor Download PDFInfo
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- CN210442337U CN210442337U CN201821907537.6U CN201821907537U CN210442337U CN 210442337 U CN210442337 U CN 210442337U CN 201821907537 U CN201821907537 U CN 201821907537U CN 210442337 U CN210442337 U CN 210442337U
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Abstract
The mixed insulating gas detection system based on the multiple sensors comprises a main control unit, a display unit, a printing unit, a sampling gas total flow control unit, a trace oxygen detection unit, a pressure monitoring unit, a mixed gas concentration detection unit, a humidity sensing unit, a first flow monitoring unit and a second flow monitoring unit; a total flow control unit is arranged on the sampling gas input main pipe, a self-sealing quick-plugging connector is arranged on the gas inlet, and the gas outlet is connected with the first gas inlet and the second gas inlet; the trace oxygen detection unit, the pressure monitoring unit, the mixed gas concentration detection unit and the first flow monitoring unit are all arranged on the first branch gas path; the humidity sensing unit and the second flow monitoring unit are arranged on the second branch air passage, and air outlets of the first flow monitoring unit and the second flow monitoring unit are connected with the exhaust pipe. The first or second branch gas circuit is provided with an expansion interface. The utility model discloses a detection of gas concentration, humidity, trace oxygen content of multiple gas mixture has the characteristics of function is complete, easy and simple to handle.
Description
Technical Field
The utility model belongs to high-voltage electrical equipment insulating gas detection area, in particular to gas concentration (mixing ratio), humidity, trace oxygen content detecting system who mixes insulating gas.
Background
With the increasing environmental protection consciousness and special environmental requirements of China, insulating gas (such as SF) is mixed6/N2And SF6/CF4) There will be an increasing number of applications in high-voltage switchgear. Reliable operation of the switch equipment plays a decisive role in safe and stable operation of a power grid, and has great influence on peripheral industrial and domestic electricity utilization, but the monitoring of the internal state of the switch equipment and fault diagnosis still have great technical problems, and a new method for researching how to quickly and accurately estimate the operation state of the equipment is extremely important.
Research and field operation experience show that monitoring the gas concentration (mixing ratio), humidity and trace oxygen content of the mixed insulating gas in the equipment is beneficial to quickly and accurately judging equipment defects and latent faults. Therefore, the measurement of the gas concentration (mixing ratio), humidity and trace oxygen content of the mixed insulating gas of the high-voltage switchgear has a wide application prospect in the field of power transformation, and is one of leading-edge subjects of insulation fault research of the high-voltage switchgear.
Along with the long-term operation of equipment, because the dynamic balance influence of trace leakage and the gas environment inside and outside the air chamber, the gas concentration (mixing ratio) of the mixed insulating gas in the air chamber can change, the gas humidity and the oxygen content can be increased, and the arc extinguishing performance of the mixed insulating gas can be greatly reduced. The mixed insulating gas, water and oxygen can be decomposed to generate sulfur dioxide (SO) under the action of electric arc2) Hydrogen sulfide (H)2S), Hydrogen Fluoride (HF), thionyl fluoride (SOF)2) And toxic decomposition products such as Nitric Oxide (NO) and the like, so that the high-voltage switch equipment cannot normally operate and even explode, and huge economic loss is brought to the society.
At present, the common mixed insulating gas analysis instrument has single function and can not realize the pairSF6/N2Mixed gas, SF6/CF4Mixed gas, N2/CF4The detection of the gas concentration (mixing ratio) of different types of mixed gas such as mixed gas and the detection of the gas humidity and the oxygen content cannot meet the field application conditions of customers. Or a plurality of analysis instruments with different functions need to be purchased, so that the price is high, the operation is complicated, the gas taking joints of different instruments need to be connected for a plurality of times in the measurement process, and the sampled gas is discharged for a plurality of times to pollute the environment; and gas consumption is great, for guaranteeing the gas pressure in the air chamber, need carry out frequent tonifying qi for the switch air chamber, cause the arc extinguishing performance unstability easily and increase work load.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a collection SF6/N2、SF6/CF4、N2/CF4And various detection indexes such as gas concentration (mixing ratio), humidity, trace oxygen content detection and the like of different types of mixed insulating gas.
In order to solve the technical problem, the utility model adopts the following technical scheme: the mixed insulating gas detection system based on the multiple sensors comprises a main control unit, a display unit, a printing unit, a sampling gas total flow control unit, a trace oxygen detection unit, a pressure monitoring unit, a mixed gas concentration (mixing ratio) detection unit, a humidity sensing unit, a first flow monitoring unit and a second flow monitoring unit;
the sampling gas main flow control unit is arranged on the sampling gas input main pipe, a self-sealing quick connector is arranged at the gas inlet of the sampling gas input main pipe, and the gas outlet is connected with the gas inlets of the first gas branch pipe and the second gas branch pipe;
the micro oxygen detection unit, the pressure monitoring unit, the mixed gas concentration (mixing ratio) detection unit and the first flow monitoring unit are arranged on the first branch gas path and are sequentially connected, the gas outlet of the micro oxygen detection unit is connected with the gas inlet of the pressure monitoring unit, the gas outlet of the pressure monitoring unit is connected with the gas inlet of the mixed gas concentration (mixing ratio) detection unit, the gas outlet of the mixed gas concentration (mixing ratio) detection unit is connected with the gas inlet of the first flow monitoring unit, and the gas outlet of the first flow monitoring unit is connected with the exhaust pipe;
the humidity sensing unit and the second flow monitoring unit are arranged on the second branch air path, an air outlet of the humidity sensing unit is connected with an air inlet of the second flow monitoring unit, and an air outlet of the second flow monitoring unit is also connected to the exhaust pipe.
The main control unit is respectively connected with the sampling gas total flow control unit, the trace oxygen detection unit, the pressure monitoring unit, the mixed gas concentration (mixing ratio) detection unit, the humidity sensing unit, the first flow monitoring unit, the second flow monitoring unit, the display unit and the printing unit through control cables.
The first branch gas circuit or the second branch gas circuit is provided with a gas sensor for detecting the density of the mixed insulating gas and sulfur dioxide SO2Hydrogen sulfide H2S, CO and H2Equal gas content expansion interfaces.
The humidity detection unit and the trace oxygen detection unit are both internally provided with high-precision temperature sensors. The gas mixture concentration (mixing ratio) detection unit integrates multiple detection sensors, and comprises a thermal conductivity sensor, a laser infrared sensor and a high-precision temperature sensor, wherein the laser infrared sensor is internally provided with the high-precision temperature sensor.
A mixed gas concentration (mixing ratio) detection unit for realizing SF6/N2、SF6/CF4、N2/CF4And detecting the gas concentration (mixing ratio) of different types of mixed gas. The laser infrared sensor is used for detecting mixed gas components with similar heat conductivity, a high-performance temperature sensor is arranged in the laser infrared sensor, the internal temperature of the gas chamber is accurately monitored, the temperature reliability and stability of the system are improved, and the precision of the gas concentration (mixing ratio) detection unit is effectively guaranteed. The thermal conductivity sensor is used for detecting mixed gas components with large thermal conductivity difference based on the thermal conductivity principle and can detect SF6/N2And CF4/N2And the concentration of the mixed gas.
The trace oxygen detection unit adopts a constant temperature control mode and is suitable for various temperature environments. Each branch gas circuit is designed with a pressure and flow monitoring unit for correcting the influence of gas flow and environmental pressure on the measurement result in real time.
The utility model discloses during operation, detection method includes following step:
1) connecting the self-sealing quick connector to high-voltage switch equipment, and checking and ensuring the air path tightness;
2) mixed gas in the gas chamber enters a sampling gas input main pipe through a self-sealing quick connector, a sampling gas total flow control unit can automatically adjust the gas inlet flow, and the whole pipeline system including all detection units is subjected to purging passivation;
3) the method comprises the following steps that a mixed gas concentration (mixing ratio) detection unit, a humidity detection unit, a trace oxygen detection unit, a sampling gas total flow control unit, a pressure monitoring unit and a first branch gas path flow monitoring unit and a second branch gas path flow monitoring unit respectively obtain a gas concentration (mixing ratio) signal, a humidity signal, a trace oxygen content signal, the flow of sample gas, the internal pressure of a gas path, the gas flow of each branch path and other signals of the mixed gas, then data are uploaded to a main control unit through digital signals or analog signals, and after the data are stored and calculated by the main control unit, the gas concentration (mixing ratio), the humidity and the trace oxygen content of the mixed insulating gas are measured;
4) the main control unit sends various data to the display unit, and the display unit displays the measured data of the concentration (mixing ratio), humidity and trace oxygen content of the mixed gas, the values of temperature, flow rate, pressure in the gas path and the like in real time and stores the data at the same time so as to carry out reexamination and research through a history inquiry function in the future.
Because the utility model discloses the reservation has multiple extension interface resource, extremely convenient extension is for having: density of mixed insulating gases, SO2、H2S、CO、H2A mixed insulating gas comprehensive gas analysis system with a gas content function.
The utility model discloses mix insulating gas detecting system based on multisensor, gas mixture concentration (mixing ratio) detecting element detects SF in the system6/N2、SF6/CF4、N2/CF4Mixing of different typesThe method comprises the steps of combining a gas concentration (mixing ratio) signal of insulating gas, detecting gas humidity by a humidity detection unit, detecting oxygen content by a trace oxygen detection unit, respectively detecting ambient temperature, gas circuit pressure and branch flow by a temperature sensing unit, a pressure monitoring unit and branch flow monitoring units, collecting data signals by a main control unit, entering the main control unit, and obtaining measurement results of the gas concentration (mixing ratio), the humidity, the trace oxygen content and the like by analysis algorithms (including gas component analysis, humidity detection, oxygen content detection, flow compensation, temperature compensation, pressure compensation and the like).
The utility model discloses a SF6/N2、SF6/CF4、N2/CF4The detection of the gas concentration (mixing ratio), humidity and trace oxygen content of different types of mixed insulating gas meets the monitoring and inspection requirements under different types of mixed insulating gas application environments, and the running state of the switch equipment can be monitored and estimated; the quick plug-in type interface is adopted in design, has the functions of automatic flow regulation, storage printing and the like, and is very suitable for application in different field environments.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, the utility model discloses mixed insulating gas detecting system based on multisensor, including main control unit 1, display element 2, printing unit 3, sampling gas total flow control unit 5, trace oxygen detecting element 4, pressure monitoring unit 7, gas mixture concentration (mixing ratio) detecting element 10, humidity sensing unit 12, first flow monitoring unit 8, second flow monitoring unit 13, sampling gas total flow control unit 5 establishes on sampling gas input manifold 14, sampling gas input manifold 14's air inlet is equipped with self-sealing quick connector 9, the gas outlet all is connected with the air inlet of first gas circuit 6 and second gas circuit 15;
the trace oxygen detection unit 4, the pressure monitoring unit 7, the mixed gas concentration (mixing ratio) detection unit 10 and the first flow monitoring unit 8 are arranged on the first branch gas circuit 6 and are sequentially connected, the gas outlet of the trace oxygen detection unit 4 is connected with the gas inlet of the pressure monitoring unit 7, the gas outlet of the pressure monitoring unit 7 is connected with the gas inlet of the mixed gas concentration (mixing ratio) detection unit 10, the gas outlet of the mixed gas concentration (mixing ratio) detection unit 10 is connected with the gas inlet of the first flow monitoring unit 8, and the gas outlet of the first flow monitoring unit 8 is connected with the exhaust pipe 16;
the humidity sensing unit 12 and the second flow monitoring unit 13 are disposed on the second branch air path 15, an air outlet of the humidity sensing unit 12 is connected to an air inlet of the second flow monitoring unit 13, and an air outlet of the second flow monitoring unit 13 is also connected to the exhaust pipe 16.
The main control unit 1 is connected with a total sampling gas flow control unit 5, a trace oxygen detection unit 4, a pressure monitoring unit 7, a mixed gas concentration (mixing ratio) detection unit 10, a humidity sensing unit 12, a first flow monitoring unit 8, a second flow monitoring unit 13, a display unit 2 and a printing unit 3 through control cables 11.
The first branch gas circuit 6 or the second branch gas circuit 15 is provided with a gas sensor for detecting the density of the mixed insulating gas and sulfur dioxide SO2Hydrogen sulfide H2S, CO and H2An expansion interface (not shown) for the gas content.
The humidity detection unit and the trace oxygen detection unit are internally provided with high-precision temperature sensors (not shown in the figure);
the gas mixture concentration (mixing ratio) detection unit 10 integrates multiple detection sensors, including containing thermal conductivity sensor, laser infrared sensor and high accuracy temperature sensor (not marked in the figure), the laser infrared sensor is built-in high accuracy temperature sensor, laser infrared sensor is used for detecting the close gas mixture component of thermal conductivity, thermal conductivity sensor detects the great gas mixture component of thermal conductivity difference based on the thermal conductivity principle.
The utility model provides an each detecting element and spare part are the current mature technology in this field, and concrete structure is no longer repeated.
The utility model discloses a detection method includes following step:
1) connecting the self-sealing quick connector 9 to high-voltage switch equipment, and checking and ensuring the air path tightness;
2) mixed gas in the gas chamber enters a sampling gas input header pipe 14 through a self-sealing quick-connection-peg 9, a sampling gas total flow control unit 5 can automatically adjust the gas inlet flow, and the whole pipeline system including all detection units is subjected to purging passivation;
3) the system comprises a mixed gas concentration (mixing ratio) detection unit 10, a humidity detection unit 12, a trace oxygen detection unit 4, a sampling gas total flow control unit 5 and a pressure monitoring unit 7, wherein first and second branch gas path flow monitoring units 8 and 13 respectively obtain a gas concentration (mixing ratio) signal, a humidity signal, an oxygen content signal, sample gas inlet flow, gas path internal pressure of mixed gas, gas flow of each branch path and other signals, then the signals are uploaded to a main control unit through digital signals or analog signals, and after the signals are stored and analyzed and calculated by the main control unit, the gas concentration (mixing ratio), humidity and oxygen content of the mixed insulating gas are measured;
4) the main control unit 1 sends various data to the display unit 2, and the display unit 2 displays the measured data of the concentration (mixing ratio), humidity and oxygen content of the mixed gas, the numerical values of temperature, total flow, internal pressure of the gas circuit and the like in real time, and simultaneously stores the data for future review and research through a history query function.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any form, and all of the technical matters of the present invention belong to the protection scope of the present invention to any simple modification, equivalent change and modification made by the above embodiments.
Claims (4)
1. Mixed insulating gas detecting system based on multisensor, its characterized in that: the device comprises a main control unit, a display unit, a printing unit, a sampling gas total flow control unit, a trace oxygen detection unit, a pressure monitoring unit, a mixed gas concentration detection unit, a humidity sensing unit, a first flow monitoring unit and a second flow monitoring unit;
the sampling gas main flow control unit is arranged on the sampling gas input main pipe, a self-sealing quick connector is arranged at the gas inlet of the sampling gas input main pipe, and the gas outlet is connected with the gas inlets of the first gas branch pipe and the second gas branch pipe;
the gas outlet of the pressure monitoring unit is connected with the gas inlet of the mixed gas concentration detection unit, the gas outlet of the mixed gas concentration detection unit is connected with the gas inlet of the first flow monitoring unit, and the gas outlet of the first flow monitoring unit is connected with the gas outlet of the exhaust pipe;
the humidity sensing unit and the second flow monitoring unit are arranged on the second branch air path, an air outlet of the humidity sensing unit is connected with an air inlet of the second flow monitoring unit, and an air outlet of the second flow monitoring unit is also connected with the exhaust pipe;
the main control unit is respectively connected with the sampling gas total flow control unit, the trace oxygen detection unit, the pressure monitoring unit, the mixed gas concentration detection unit, the humidity sensing unit, the first flow monitoring unit, the second flow monitoring unit, the display unit and the printing unit through control cables.
2. The multi-sensor based hybrid insulating gas detection system of claim 1, wherein:
the first branch gas circuit or the second branch gas circuit is provided with a gas sensor for detecting the density of the mixed insulating gas and sulfur dioxide SO2Hydrogen sulfide H2S, CO and H2An expansion interface for gas content.
3. The multi-sensor based hybrid insulating gas detection system of claim 1, wherein: the humidity detection unit and the trace oxygen detection unit are both internally provided with high-precision temperature sensors.
4. The multi-sensor based hybrid insulating gas detection system of claim 1, wherein: the gas mixture concentration detection unit integrates multiple detection sensors, and comprises a thermal conductivity sensor, a laser infrared sensor and a high-precision temperature sensor, wherein the laser infrared sensor is arranged in the high-precision temperature sensor, the laser infrared sensor is used for detecting gas mixture components with similar thermal conductivity, and the thermal conductivity sensor detects the gas mixture components with larger thermal conductivity difference based on a thermal conductivity principle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821907537.6U CN210442337U (en) | 2018-11-20 | 2018-11-20 | Mixed insulating gas detection system based on multisensor |
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| CN201821907537.6U CN210442337U (en) | 2018-11-20 | 2018-11-20 | Mixed insulating gas detection system based on multisensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820452A (en) * | 2021-08-18 | 2021-12-21 | 深圳供电局有限公司 | Method, device and system for evaluating insulation degradation gas of switch cabinet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113820452A (en) * | 2021-08-18 | 2021-12-21 | 深圳供电局有限公司 | Method, device and system for evaluating insulation degradation gas of switch cabinet |
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