CN107797041B - Sensor environment compatibility test system in gas insulated electrical equipment - Google Patents
Sensor environment compatibility test system in gas insulated electrical equipment Download PDFInfo
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- CN107797041B CN107797041B CN201711102515.2A CN201711102515A CN107797041B CN 107797041 B CN107797041 B CN 107797041B CN 201711102515 A CN201711102515 A CN 201711102515A CN 107797041 B CN107797041 B CN 107797041B
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- 238000012544 monitoring process Methods 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 238000011056 performance test Methods 0.000 claims abstract description 4
- 229910018503 SF6 Inorganic materials 0.000 claims description 19
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 19
- 230000006399 behavior Effects 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 12
- 230000032683 aging Effects 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 5
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 4
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 4
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- 238000003032 molecular docking Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 159
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- 239000000463 material Substances 0.000 description 16
- 238000001514 detection method Methods 0.000 description 10
- 230000002159 abnormal effect Effects 0.000 description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 238000005070 sampling Methods 0.000 description 8
- 238000007599 discharging Methods 0.000 description 7
- 230000005856 abnormality Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
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- 229910052697 platinum Inorganic materials 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 3
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- 238000011160 research Methods 0.000 description 2
- 238000009666 routine test Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
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- 238000012806 monitoring device Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention provides a sensor environment compatibility testing system in gas insulated electrical equipment, comprising: the gas storage tank is used for establishing an internal environment for testing the environmental compatibility of the sensor in the gas-insulated electrical equipment; a discharge unit for simulating different types of discharge behavior existing inside the gas-insulated electrical apparatus; the heating unit is used for heating the air storage tank; the gas injection port is used for injecting insulating gas into the gas storage tank; the gas taking port is used for extracting the insulating gas in the gas storage tank; the sensor mounting platform is used for mounting a sensor to be tested; the gas taking port is also connected with an external insulating gas testing device and is used for extracting insulating gas in the gas storage tank to perform performance test on the external insulating gas testing device; the sensor mounting platform also establishes a connection of the sensor with an external monitoring unit to monitor the performance of the sensor through the external monitoring unit. The invention can test the environmental compatibility of the sensor in the gas insulated electrical equipment and avoid the occurrence of power grid accidents caused by the occurrence of faults in the gas insulated equipment.
Description
Technical Field
The invention relates to the field of transformer testing, in particular to a sensor environment compatibility testing system in gas-insulated electrical equipment.
Background
The gas insulation equipment has the advantages of being nonflammable, not explosive, flexible in layout, small in occupied area, small in maintenance amount and the like, has wide development prospect in urban power grids, becomes important technical equipment in some sensitive areas, and particularly, SF6 gas insulation equipment such as GIS, GIL, SF Gas Insulation Transformers (GITs) and the like gradually become main power grid equipment, and some institutions are developing research and application of novel environment-friendly insulating gas. However, with popularization and application of the gas insulation device, the operation and maintenance of the gas insulation device in operation gradually expose some problems. At present, the high and medium voltage sides of the gas insulation equipment are mostly closed cable outgoing lines or GIL outgoing lines, and because the conductive loop and the insulation material are in closed insulation gas, the equipment needs to be inflated and deflated when routine tests are carried out, which is greatly different from the preventive tests of the traditional power equipment. After the transformer is put into operation, the insulation resistance, the gas humidity and the composition of the winding, the sleeve, the iron core and the clamping piece are only tested by routine tests in general, and effective technical supervision on the state of the transformer is difficult to realize. Because of the difference between insulating medium and heat dissipation, the on-line state monitoring technology of the traditional oil insulating equipment cannot be directly applied to the gas insulating equipment, and particularly, the problem of compatibility between the material and decomposition products such as insulating gas and insulating gas discharge overheat and the like of the on-line monitoring sensor material (including packaging and communication materials) in the gas insulating equipment under high-pressure even high-temperature environments is still blank in research, namely, the compatibility is not affected by the two under the environments. The sensor material is not mutually influenced, namely, the sensor material is not corroded by decomposition products such as insulating gas and insulating gas discharge overheat, so that the performance and service life are reduced, even the sensor material is not invalid, and the insulating gas is not influenced by substances escaping from physical and chemical reactions of the sensor material or the sensor, the insulating gas and the decomposition products such as insulating gas and insulating gas discharge overheat. The insulating property includes creeping discharge resistance and space ionization resistance. The sensor material is usually semiconductor, ceramic, optical fiber and the like besides the known materials such as stainless steel, copper, platinum and the like in the GIS, so that the selection of the material with better compatibility of the built-in sensor is particularly important for gas insulation equipment.
Disclosure of Invention
The invention aims to solve the technical problem of providing a sensor environment compatibility testing system in gas-insulated electrical equipment, which overcomes the defect that the reliability of the internal state monitoring device of the gas-insulated electrical equipment to the operation of a transformer cannot be determined.
In order to solve the above technical problems, the present invention provides a sensor environmental compatibility testing system in a gas insulated electrical apparatus, which may include:
the gas storage tank is used for establishing an internal environment for testing the environmental compatibility of the sensor in the gas-insulated electrical equipment;
the discharging unit is partially arranged in the gas storage tank and is used for simulating different types of discharging behaviors existing in the gas-insulated electrical equipment;
the heating unit is used for heating the gas storage tank so as to enable the temperature in the gas storage tank to reach the temperature of the gas insulated electrical equipment in various operating environments;
the gas injection port is positioned on the gas storage tank body and is used for injecting insulating gas into the gas storage tank;
the gas taking port is positioned on the gas storage tank body;
the sensor mounting platform is arranged in the air storage tank and is used for mounting a sensor to be tested;
the gas extraction port is also connected with an external insulating gas testing device and is used for extracting insulating gas in the gas storage tank to perform performance test on the external insulating gas testing device when the heating unit enables the temperature in the gas storage tank to reach the temperature of the gas insulating electric equipment in each operating environment and the sensor mounting platform is provided with a sensor;
the sensor mounting platform is further connected with an external monitoring unit, so that when the heating unit enables the temperature in the air storage tank to reach the temperature of the gas-insulated electrical equipment in each operating environment, and the sensor mounting platform is provided with a sensor, the performance of the sensor is monitored through the external monitoring unit.
In an alternative embodiment, the system for testing the environmental compatibility of a sensor in a gas insulated electrical apparatus of the present invention further comprises:
and the vacuum pump is connected with the air storage tank and is used for carrying out vacuumizing operation on the air storage tank before the air injection port injects the insulating gas into the air storage tank.
In an alternative embodiment, the system for testing the environmental compatibility of a sensor in a gas insulated electrical apparatus of the present invention further comprises:
and the barometer is connected with the air storage tank and is used for measuring and monitoring the pressure of the insulating gas in the air storage tank in real time.
In an alternative embodiment, the air storage tank is detachable from the middle into two sections.
In an alternative embodiment, the two sections of the air reservoir may be joined together by a butt flange to form a sealed space.
In an alternative embodiment, a corrugated pipe is arranged on the outer surface of the middle part of the air storage tank to prevent the air storage tank from deforming due to expansion caused by heat and contraction caused by cold.
In an alternative embodiment, the discharge unit includes:
the discharge device is positioned in the air storage tank, and the booster power supply loop is positioned outside the air storage tank and is used for applying different types of voltages to the discharge device so that the discharge unit simulates corresponding discharge behaviors.
In an alternative embodiment, a switch is connected between the discharging device and the boost power supply circuit.
In an alternative embodiment, the heating unit comprises a heating resistor and an up-current power supply loop, wherein the heating resistor effects heating under control of the up-current power supply loop.
In an alternative embodiment, a switch is connected between the heating resistor and the up-current power supply loop.
In an alternative embodiment, the sensor mounting platform comprises a sensor mounting base and an optical fiber interface board, wherein the sensor mounting base is arranged in the air storage tank and used for mounting the sensor to be tested, and the optical fiber interface board is connected with the external monitoring unit through optical fibers.
In an alternative embodiment, the sensor mounting base is a separate base plate or an open flange.
In an alternative embodiment, a temperature measuring device is further arranged on the tank wall of the gas storage tank, and is used for measuring and monitoring the temperature of the insulating gas inside the gas storage tank.
In an alternative embodiment, the inner wall of the gas storage tank, the inner wall of the gas injection port, the inner wall of the gas taking port, the sensor mounting base and the part contacted with the insulating gas are coated with tetrafluoroethylene.
In an alternative embodiment, the different types of discharge behavior include at least one of an insulating gas gap discharge, an insulating paper creeping discharge, and an insulating material discharge.
In alternative embodiments, the various operating environments include an operating state of the gas-insulated electrical apparatus in a normal operating state, an operating state of the gas-insulated electrical apparatus after aging, and an operating state of the gas-insulated electrical apparatus when the gas-insulated electrical apparatus reaches a high temperature over-temperature.
In an alternative embodiment, the insulating gas includes any one of sulfur hexafluoride gas or sulfur hexafluoride gas mixture. .
The embodiment of the invention has the beneficial effects that:
the invention adopts the sensor environment compatibility testing system in the gas insulated electrical equipment, can verify the influence of the built-in sensor on the reliability of the gas insulated equipment, can select and install the reliable built-in sensor for the gas insulated equipment on one hand, further discover defects early and treat the defects in time at the early stage of the occurrence of the internal faults of the gas insulated equipment, and avoid the occurrence of power grid accidents caused by the internal faults of the gas insulated equipment.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the construction of one embodiment of a sensor environmental compatibility testing system within a gas insulated electrical apparatus of the present invention.
FIG. 2 is a flow chart of a testing method of one embodiment of a sensor environmental compatibility testing system in a gas insulated electrical apparatus employing the present invention.
Detailed Description
The following description of embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced.
The invention provides a sensor environment compatibility testing system in gas insulated electrical equipment, one embodiment of which can be constructed as shown in figure 1, comprising:
the gas tank 1 is exemplified by a stainless steel gas tank 1 in the present embodiment, and the gas tank 1 can bear the pressure caused by heating the internal insulating gas; the gas tank 1 of the present invention simulates the internal environment of a gas insulated device (e.g., a gas insulated electrical device (GIT) such as GIS, GIL, GIT) in a power grid system. By way of example, the air storage tank 1 is formed by splicing two sections. The two sections of the air storage tanks 1 are spliced and disassembled through the butt flange 11 of the splicing port. In an alternative embodiment, a high-temperature resistant sealing rubber gasket 12 can be additionally arranged between the two butt flanges 11, so that a sealing space is formed after the air storage tank 1 is spliced.
And a discharge unit 2 for simulating different types of discharge behavior existing inside the gas-insulated electrical apparatus. By way of example, the different types of discharge behavior include at least one of an insulating gas gap discharge, an insulating paper creeping discharge, and an insulating material discharge. Embodiments of the present invention are not limited to the three discharge behaviors listed herein. Further, the discharge unit 2 may include a discharge device 21, a boost power supply circuit 22, and a switch 23. Wherein, the discharging device 21 is arranged in the air storage tank 1, and is connected with a boost power supply loop 22 outside the air storage tank 1 through an electric wire, and a switch 23 is connected between the discharging device 21 and the boost power supply loop 22 and used for controlling the on-off of circuits of the discharging device 21 and the boost power supply loop 22. In other embodiments, the discharge unit 2 may not include the switch 23. Furthermore, in other embodiments, the discharge unit 2 may be formed by other sub-circuits that may simulate a variety of different discharge behaviors. In summary, in the present invention, the discharge unit 2 is used to simulate various different discharge behaviors within a gas-insulated device (e.g., GIS, GIL, GIT, etc.) in a power grid system.
And a heating unit 3 for heating the gas storage tank 1 so that the temperature in the gas storage tank 1 reaches the temperature of the gas-insulated electrical equipment in various operating environments. By way of example, the various operating environments include, but are not limited to: the gas-insulated electrical equipment is in a normal running state, a running state after aging of the gas-insulated electrical equipment and a running state when the gas-insulated electrical equipment reaches a high-temperature overheat temperature. Further, in the present embodiment, the heating unit 3 may include a heating device (e.g., a heating resistor) 31, an up-current power supply circuit 32, and a switch 33. Wherein, heating device 31 is installed in the inside of gas holder 1, and it is connected with the outside power supply that rises return circuit 32 of gas holder 1 through the electric wire, and switch 33 is connected between heating device 31 and power supply that rises return circuit 32 and is used for controlling the break-make of the circuit of heating device 31 and power supply that rises return circuit 32. In other embodiments, the heating unit 3 may not include the switch 33. Furthermore, in other embodiments, the heating unit 3 may be constituted by other sub-circuits that can perform a heating function. In summary, in the present invention, the heating unit 3 is used to simulate various temperature scenarios within a gas insulated device (e.g. GIS, GIL, GIT) in a power grid system.
In addition, to cooperate with the heating unit 3, the system of the present embodiment is further provided with a temperature measuring device 34 on the tank wall of the gas tank 1 for measuring and monitoring the temperature of the insulating gas inside the gas tank 1. By way of example, the temperature measuring device 34 may be a platinum resistance temperature measuring device.
A gas injection port 15 provided on the gas tank body (for example, top in fig. 1) for injecting an insulating gas into the gas tank 1; in particular implementation, the sensor environmental compatibility testing system in the gas insulated electrical equipment is externally connected with the air charging device 90, and the air charging device 90 can inject insulating gas, such as SF, into the air storage tank 1 through the gas injection port 15 6 Gas or SF 6 And (3) mixing the gases. In an alternative embodiment, the gas injection port 15 is connected with a gas valve 16 for controlling the same.
And the air taking port 17 is positioned on the air storage tank body and is used for extracting the insulating gas in the air storage tank. Furthermore, in an alternative embodiment, the system for testing the environmental compatibility of the sensor in the gas-insulated electric apparatus may further comprise a vacuum pump 4 connected to the gas storage tank for performing a vacuum operation on the gas storage tank 1 through the gas-taking port 17 before the gas injection port 15 injects the insulating gas into the gas storage tank 1. Optionally, an air taking port 17 is arranged at the top of the air storage tank 1, and the air taking port 17 is connected with an air valve 18.
The sensor mounting platform 5 is mounted inside the air storage tank 1 and is used for mounting a sensor 7 for testing. For example, in this embodiment, SF may be selected for testing 6 And a sensor which is arranged in the gas-insulated transformer. Further, the sensor mounting platform 5 also establishes connection of the sensor 7 with an external monitoring unit 6 so that the performance of the sensor 7 is monitored by the external monitoring unit 6 when the heating unit 3 brings the temperature inside the air tank 1 to the temperature of the gas-insulated transformer in each operating environment, and the sensor mounting platform 5 is mounted with the sensor 7. The sensor mounting platform 5 comprises a sensor mounting base 51 and an optical fiber interface board 52, wherein the sensor mounting base 51 is made of stainless steel material and is arranged in the air storage tank 1 and used for mounting a to-be-detected sensor 7, and is connected with the optical fiber interface board 52 outside the tank; the optical fiber interface board 52 is connected to the external monitoring unit 6 through optical fibers. In this embodiment, the sensor mounting base 51 is a separate substrate structure mounted on the inner wall of the bottom of the air tank 1, and in other alternative embodiments, the sensor mounting base 51 may be an open flange, and the sensor 7 to be measured is directly mounted on the open flange.
In addition, the gas-taking port 17 is further connected to an external insulating gas testing device (not shown), and is configured to, when the heating unit 3 makes the temperature in the gas storage tank 1 reach the temperature of the gas-insulated transformer in each operating environment, and the sensor mounting platform 5 is mounted with the sensor 7, draw the insulating gas in the gas storage tank 1 to perform a performance test on the external insulating gas testing device.
In addition, optionally, a barometer 13 is installed on the top of the air tank 1 and used for monitoring the pressure inside the air tank 1, and a pressure control valve 14 is also installed on the top of the air tank 1, and the pressure control valve 14 is used for adjusting the internal pressure of the air tank 1 during testing, and the pressure control valve 14 can be adjusted according to the reading of the barometer 13 during testing so as to adjust the air pressure inside the air tank 1 to reach the testing requirement condition.
In addition, optionally, a corrugated tube 19 is disposed on the outer surface of the middle portion of the air storage tank 1, so as to prevent the air storage tank 1 from deforming due to expansion caused by heat and contraction caused by cold during testing.
Furthermore, the air reservoir 1 is optionally provided with grounding means 10.
In order to prevent adsorption of insulating gas and to prevent chemical reaction in the tank during the test, tetrafluoroethylene material may be applied to the inner wall of the gas tank 1, the inner wall of the gas injection port 15, the inner wall of the gas intake port 17, the pressure control valve 14, the sensor mounting base 51, and the portions inside and outside the tank that can be in contact with SF6 insulating gas. The tetrafluoroethylene material used in this embodiment is only an example, and in other alternative embodiments, the protective material may be selected from other materials for preventing the adsorption of insulating gas and chemical reaction affecting the test.
FIG. 2 is a flow chart of a testing method of one embodiment of a sensor environmental compatibility testing system in a gas insulated electrical apparatus employing the present invention. As shown in fig. 2, the method may include:
step S1: the sensor 7 to be measured is mounted on the sensor mounting platform 51, and the performance parameters of the sensor 7 are led out to the monitoring unit 6 through optical fibers.
Step S2: determining the discharge behavior of a discharge unit, and testing the discharge behavior;
step 2-1, firstly, selecting an insulating gas gap discharge model;
step 2-2, butting and sealing two sections of gas storage tanks 1, and vacuumizing the gas storage tanks 1 through gas taking ports 17 by using a real gas pump 4;
step 2-3, injecting SF6 insulating gas through the gas injection port 15 by using an external inflating device 90, and closing all gas valves;
step 2-4, switching on a current-rising power supply loop 32 of the heating unit 3, heating the air storage tank 1 through a heating device 31, monitoring the temperature in the tank through a platinum resistance temperature testing device 34, and keeping constant when the temperature is heated to the normal operating temperature of the SF6 gas insulation transformer;
step 2-5: switching on the booster power supply circuit 22 of the discharge unit 2 until the discharge device 21 discharges, and keeping the voltage constant;
step 2-6: the working condition of the sensor 7 is monitored through the external monitoring unit 6, gas is taken through the gas taking port 17 every 15 minutes within 2 hours, and a gas sample is subjected to performance detection;
step 2-7, in the test process, if the working condition of the sensor 7 is abnormal or the detection result of the sampling gas exceeds a preset numerical range, stopping the test, and verifying that the sensor 7 is incompatible with the current environment (namely the normal operation environment of the SF6 gas insulation transformer);
step 2-8, performing a predetermined test time, if no abnormal working condition of the sensor 7 is found and the detection result of the sampling gas is within a preset numerical range; the actions 2-4 to 2-7 in step 2 are repeated 10 times, and if no abnormality is found, the sensor 7 is verified to be compatible with the current testing environment (namely the normal operation environment of the SF6 gas insulated transformer), and the next step of testing can be carried out. Of course, in other alternative embodiments, the number of times of repeating the actions 2-4 to 2-7 in step 2 can be adjusted according to actual experimental requirements.
Step 3: performing an accelerated aging test under such a model as described above;
step 3-1, maintaining the discharge device 22 to discharge continuously in the insulating gas gap;
step 3-2, the temperature in the air storage tank 1 is increased through the heating unit 3 to exceed the normal operation temperature of the gas insulation transformer, the sensor 7 is subjected to accelerated aging, and in other alternative embodiments, the value exceeding the normal operation temperature is set according to the actual experiment requirement;
step 3-3: repeating steps 2-6 to 2-8 in step 2; if no abnormality is found, the sensor 7 is verified to be compatible with the environment under the insulation gas gap discharge model, and the next test can be carried out.
Step 4: the switch 33 of the heating unit 3 and the switch 23 of the discharging unit 2 are turned off, the test gas in the gas tank 1 is recovered, and the gas tank 1 is disassembled into two sections.
Step S5: switching a second discharge model for testing, wherein the insulation paper creeping discharge model is selected in the embodiment; repeating the steps 2-4; if no abnormality is found, the sensor 7 is verified to be compatible with the environment under the insulation paper surface discharge model, and the next test can be carried out.
Step 6: switching a third discharge model for testing, wherein an insulating material discharge model is selected in the embodiment; repeating the steps 2-4; if no abnormality is found, the sensor is verified to be compatible with the environment under the discharge model of the insulating material, and the next test can be carried out.
Step 7: continuously switching the discharge model and repeating the step S2-the step S4; switching to the last discharge model for testing; in this embodiment, only three discharge models are preferably selected for testing, and of course, in other alternative embodiments, the number of the discharge models and the testing sequence of the discharge models can be adjusted according to actual experimental requirements. If no abnormality is found, the sensor 7 is verified to be compatible with the environment under all discharge models, and the next test can be performed.
Step 8: performing a high-temperature overheat test;
step 8-1, butting and sealing two sections of gas storage tanks 1, and vacuumizing the gas storage tanks 1 by using a real gas pump 4;
step 8-2, injecting SF6 insulating gas through the gas injection port 15 by using an external inflating device 90, and closing all gas valves;
step 8-3, switching on a current-rising power supply loop 32 of the heating unit 3, heating the air storage tank 1 through a heating device 31, monitoring the temperature in the tank through a platinum resistance temperature testing device 34, and keeping constant when the temperature is heated to a certain value exceeding the normal operation temperature of the SF6 gas insulation transformer, wherein the value is determined according to the actual test requirement;
step 8-4: the working condition of the sensor 7 is monitored through the external monitoring unit 6, gas is taken through the gas taking port 17 every 15 minutes within 2 hours, and a gas sample is subjected to performance detection;
8-5, in the test process, if the working condition of the sensor 7 is abnormal or the detection result of the sampling gas exceeds a preset numerical range, stopping the test, and verifying that the sensor 7 is incompatible with the high-temperature overheat environment, namely the sensor 7 is incompatible with the working environment of the SF6 gas insulation transformer;
step 8-6, performing a predetermined test time, if no abnormal working condition of the sensor 7 is found and the detection result of the sampling gas is within a preset numerical range; the sensor is verified to be compatible with the current high-temperature overheat environment, and the next test can be carried out.
Step 9: performing a high-temperature overheat test of wrapping air-change insulating paper on the heating device 31;
step 9-1, wrapping the surface of the heating device with air-change insulating paper 31;
step 9-2, repeating all the steps of the step 8; if the working condition of the sensor 7 is not found to be abnormal and the detection result of the sampling gas is within a preset numerical range; the sensor is verified to be compatible with the current high-temperature overheat environment, and the next test can be carried out.
Step 10, switching the injected insulating gas into SF6 insulating gas containing a certain proportion of water; repeating the steps 2-9, if the working condition of the sensor 7 is not found to be abnormal and the detection result of the sampling gas is within a preset numerical range; this sensor 7 is verified to be compatible with all of the above test environments and can be subjected to further testing.
Step 11, switching the injected insulating gas into SF6 insulating gas mixed with typical decomposition products of SF6 insulating gas; repeating the steps 2-9, if the working condition of the sensor 7 is not found to be abnormal and the detection result of the sampling gas is within a preset numerical range; this sensor 7 was verified to be compatible with all of the above test environments.
Step 12: after the steps are executed, no abnormal working condition of the sensor 7 is found, and the detection result of the sampling gas is within a preset numerical range; the compatibility test proves that the environment compatibility of the tested sensor 7 and the SF6 gas insulation transformer is very good.
Step S13: and (3) replacing the sensor with other sensors to be tested, repeating the steps 1-12, and performing environmental compatibility test on the other sensors to be tested to obtain the conclusion of the environmental compatibility of the other sensors and the SF6 gas-insulated transformer.
Of course, in other alternative embodiments, the method for testing the environmental compatibility of the sensor with the SF6 gas insulated transformer can also be used for testing the environmental compatibility of the sensor with other gas insulated electrical equipment. And will not be described in detail herein.
From the above description, the beneficial effects of the invention are as follows:
the invention adopts the sensor material and insulating gas compatibility testing system and testing method, can verify the influence of the built-in sensor on the reliability of the gas insulation equipment, can select and install the reliable built-in sensor for the gas insulation equipment, further discover defects early and timely treat the defects in the early stage of the occurrence of the internal faults of the gas insulation equipment, and avoid the occurrence of power grid accidents caused by the internal faults of the gas insulation equipment.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (14)
1. A system for testing environmental compatibility of a sensor in a gas insulated electrical apparatus, comprising:
the gas storage tank is used for establishing an internal environment for testing the environmental compatibility of the sensor in the gas-insulated electrical equipment;
a discharge unit for simulating different types of discharge behavior existing inside the gas-insulated electrical apparatus;
the heating unit is used for heating the gas storage tank so as to enable the temperature in the gas storage tank to reach the temperature of the gas insulated electrical equipment in various operating environments; the heating unit comprises a heating resistor and an up-current power supply loop, wherein the heating resistor is heated under the control of the up-current power supply loop; a switch is connected between the heating resistor and the up-current power supply loop and is used for controlling the on-off of the heating resistor and the up-current power supply loop;
the gas injection port is positioned on the gas storage tank body and is used for injecting insulating gas into the gas storage tank;
the gas taking port is positioned on the gas storage tank body and is used for extracting insulating gas in the gas storage tank;
the sensor mounting platform is arranged in the air storage tank and is used for mounting a sensor to be tested; the tank wall of the gas storage tank is also provided with a temperature measuring device for measuring and monitoring the temperature of the insulating gas in the gas storage tank;
the gas taking port is also connected with an external insulating gas testing device and is used for extracting insulating gas in the gas storage tank to perform performance test on the external insulating gas testing device when the heating unit enables the temperature in the gas storage tank to reach the temperature of the gas insulating electric equipment in each operating environment and the sensor mounting platform is provided with a sensor;
the sensor mounting platform is further connected with an external monitoring unit, so that when the heating unit enables the temperature in the air storage tank to reach the temperature of the gas-insulated electrical equipment in each operating environment, and the sensor mounting platform is provided with a sensor, the performance of the sensor is monitored through the external monitoring unit.
2. The system for testing the environmental compatibility of a sensor in a gas insulated electrical apparatus of claim 1, further comprising:
and the vacuum pump is connected with the air storage tank and is used for carrying out vacuumizing operation on the air storage tank through the air taking port before the air injection port injects the insulating gas into the air storage tank.
3. The system for testing the environmental compatibility of a sensor in a gas insulated electrical apparatus of claim 1, further comprising:
and the barometer is connected with the air storage tank and is used for measuring and monitoring the pressure of the insulating gas in the air storage tank in real time.
4. The system for testing the environmental compatibility of sensors in a gas insulated electrical apparatus of claim 1 wherein said gas reservoir is detachable from the middle into two sections.
5. The system for testing the environmental compatibility of sensors in a gas insulated electrical apparatus of claim 4 wherein said two sections of said gas storage tank are integrally formed into a sealed space by means of a docking flange.
6. The system for testing the environmental compatibility of a sensor in a gas insulated electrical apparatus according to claim 1, wherein a corrugated tube is provided on the outer surface of the middle portion of the gas container, so as to prevent the gas container from being deformed due to expansion with heat and contraction with cold.
7. The system for testing the environmental compatibility of a sensor in a gas insulated electrical apparatus according to claim 1, wherein said discharge unit comprises:
the discharge device is positioned in the air storage tank, and the booster power supply loop is positioned outside the air storage tank and is used for applying different types of voltages to the discharge device so that the discharge unit simulates corresponding discharge behaviors.
8. The system for testing the environmental compatibility of sensors in a gas insulated electrical apparatus of claim 7 wherein a switch is connected between said discharge means and said boost power circuit.
9. The system of claim 1, wherein the sensor mounting platform comprises a sensor mounting base and an optical fiber interface board, the sensor mounting base is disposed inside the air storage tank for mounting the sensor to be tested, and the optical fiber interface board is connected to the external monitoring unit through an optical fiber.
10. The system of claim 9, wherein the sensor mounting base is a separate substrate or an open flange.
11. The system of claim 9, wherein the gas reservoir inner wall, the gas injection port inner wall, the gas extraction port inner wall, the sensor mounting base, and the portion in contact with the insulating gas are coated with tetrafluoroethylene.
12. The system for testing the environmental compatibility of sensors in a gas insulated electrical apparatus according to any of claims 1-10, wherein said different types of discharge behavior comprise at least one of an insulating gas gap discharge, an insulating paper creeping discharge, and an insulating material discharge.
13. The system for testing the environmental compatibility of sensors in a gas-insulated electrical apparatus according to any one of claims 1-10, wherein said various operating environments include a normal operating state of said gas-insulated electrical apparatus, an operating state of said gas-insulated electrical apparatus after aging, and an operating state of said gas-insulated electrical apparatus when said gas-insulated electrical apparatus reaches a high temperature.
14. The system for testing the environmental compatibility of a sensor in a gas insulated electrical apparatus according to any one of claims 1-10, wherein the insulating gas comprises any one of sulfur hexafluoride gas or sulfur hexafluoride gas mixture.
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