Novel environment-friendly insulating gas electrical equipment live-line test system and test method

Abstract

The invention relates to a novel environment-friendly insulating gas electrical equipment live-line test system and a test method. A power transmission pipeline test prototype is filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen; a first end of the power transmission pipeline test prototype is connected with the power frequency test transformer, a shell of the power transmission pipeline test prototype and a shell of the power frequency test transformer are grounded together to form a voltage test loop, and a second end of the power transmission pipeline test prototype is connected with one end of a center conductor of the insulator. The other end of the central conductor is connected with the first end of the power transmission pipeline test prototype to form a current test loop; the test process comprises the following steps: carrying out a full-voltage current test loop-carrying out a live-line test-obtaining a detection result; the power transmission pipeline test prototype is connected with the power frequency test transformer and the current generator to form a full-voltage current test loop, a long-time full-voltage no-load test and a full-voltage large-load test can be carried out, and gas and equipment states during the test period can be really detected.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly gas-insulated power transmission and distribution equipment, and in particular to a novel live-test system and test method for environmentally friendly gas-insulated electrical equipment. Background Art

[0002] Sulfur hexafluoride (SF 6 ) gas is widely used in electrical equipment because of its excellent insulation and arc extinguishing medium, but its greenhouse effect is CO 2 It is 24,300 times stronger than the atmosphere and has a lifetime of more than 3,000 years in the atmosphere. It is listed as one of the six greenhouse gases that are prohibited from emission and restricted from use. Existing research shows that the new environmentally friendly insulating gas trifluoromethylsulfonyl fluoride (CF 3 SO 2 The dielectric strength of F) is SF 6 1.6 times of gas, liquefaction temperature is -23.7℃, biological toxicity and environmental performance (GWP value) and other key performances are excellent, CF 3 SO 2 F and N 2 The mixed gas has high insulation strength and low greenhouse effect, and is considered to be a potential SF 6 Environmentally friendly alternative gases are gradually being used in equipment. 3 SO 2 F / N 2 Mixed gas in SF 6 and mixed gas, C 4 F 7 N / CO 2 The performance differences of insulating gases for engineering applications such as mixed gases are increasing. There is a lack of long-term test assessment on the insulation tolerance and gas-solid compatibility of insulating gases used in electrical equipment, making it difficult to ensure the reliable and safe operation of this type of equipment.

[0003] At present, most of them use simulation calculation or simulation experiment methods to obtain SF 6 and its mixed gas, C 4 F 7 N / CO 2 The insulation strength of the mixed gas and the gas-solid compatibility, the structural dimensions and performance parameters of the experimental equipment and calculation model are quite different from the actual equipment. The impact of simultaneously applied voltage and current on the gas and equipment performance is not considered, which is inconsistent with the actual operating conditions of the equipment. It can be seen that this kind of research and structure cannot truly assess whether the gas insulation strength and gas-solid compatibility during the life cycle of the equipment can meet the operating requirements. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a new type of environmentally friendly insulating gas electrical equipment live test system and test method, which has the advantage of being able to carry out long-term live tests by applying voltage and current simultaneously, and to verify the operating reliability of the equipment under various operating conditions throughout its life cycle.

[0005] The above-mentioned inventive object of the present invention is achieved through the following technical solutions: On the one hand, the present invention provides a new type of environmentally friendly insulating gas electrical equipment live test system, including a transmission pipeline test prototype, a power frequency test transformer and a current generator; the transmission pipeline test prototype is filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen, and the current generator includes a current booster and an insulator, and the insulator is inserted through the center of the current booster; the first end of the transmission pipeline test prototype is connected to the power frequency test transformer through a first wire, and the shell of the transmission pipeline test prototype and the shell of the power frequency test transformer are grounded together to form a voltage test loop, and the second end of the transmission pipeline test prototype is provided with a current transformer, and the second end of the transmission pipeline test prototype is connected to one end of the central conductor of the insulator through a second wire, and the other end of the central conductor of the insulator is connected to the first end of the transmission pipeline test prototype through a third wire to form a current test loop.

[0006] Preferably, in the new environmentally friendly insulated gas electrical equipment live test system provided by the present invention, the power transmission pipeline test prototype comprises a gas-insulated power transmission pipeline and two transition units, the two transition units are respectively arranged at opposite ends of the gas-insulated power transmission pipeline, and the gas-insulated power transmission pipeline and the two transition units are filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen.

[0007] Preferably, in the new environmentally friendly insulated gas electrical equipment live test system provided by the present invention, the gas-insulated transmission pipeline includes a pipeline casing, a first high-voltage guide rod and at least one support insulator, the pipeline casing is enclosed to form an environmentally friendly gas chamber, and basin-type insulators are provided at opposite ends of the pipeline casing to close the pipeline casing, the first high-voltage guide rod and the support insulator are both arranged in the environmentally friendly gas chamber, the opposite ends of the first high-voltage guide rod are respectively connected to two basin-type insulators, the top end of the support insulator is connected to the first high-voltage conduit, the bottom end of the support insulator is connected to the inner wall of the environmentally friendly gas chamber, and the support insulator and the basin-type insulator are arranged at intervals; the environmentally friendly gas chamber is filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen.

[0008] Preferably, in the new environmentally friendly insulating gas electrical equipment live test system provided by the present invention, a hand hole and an inflation port are provided on the pipe shell, both the hand hole and the inflation port are connected to the environmentally friendly gas chamber, the hand hole is covered with a cover plate, a glass window is installed on the cover plate, and a first special air pressure gauge is installed on the inflation port.

[0009] Preferably, in the new environmentally friendly insulated gas electrical equipment live test system provided by the present invention, the transition unit includes a high-voltage bushing, a pipe shell, a second high-voltage guide rod and a central guide rod, the bottom end of the high-voltage bushing is connected to the pipe shell through a bushing flange, one end of the pipe shell is connected to the basin-type insulator, a sealing plate is provided at the end of the pipe shell away from the basin-type insulator, the pipe shell is enclosed to form a transition air chamber, the transition air chamber is connected to the cavity of the high-voltage bushing, and the transition air chamber is filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen; the bottom end of the central guide rod passes through the high-voltage bushing and is inserted into the transition air chamber, and the top end of the central guide rod extends outward along the center line direction of the high-voltage bushing; the second high-voltage guide rod is arranged in the transition air chamber, one end of the second high-voltage guide rod is connected to the first high-voltage guide rod through the basin-type insulator, and the other end of the second high-voltage guide rod is connected to the bottom end of the central guide rod.

[0010] Preferably, in the new environmentally friendly insulating gas electrical equipment live test system provided by the present invention, an air inlet is provided on the pipeline shell, the air inlet is connected to the transition air chamber, and a second special air pressure gauge is installed on the air inlet.

[0011] Preferably, in the novel environmentally friendly insulating gas electrical equipment live test system provided by the present invention, the gas pressure range of the mixed gas of trifluoromethylsulfonyl fluoride and nitrogen is 0.5-0.9 MPa.

[0012] Preferably, in the novel environmentally friendly insulating gas electrical equipment live test system provided by the present invention, the volume proportion of trifluoromethylsulfonyl fluoride in the mixed gas of trifluoromethylsulfonyl fluoride and nitrogen is 10% to 50%.

[0013] Preferably, in the novel environmentally friendly insulating gas electrical equipment live test system provided by the present invention, the water content of the mixed gas of trifluoromethylsulfonyl fluoride and nitrogen is less than 100 μL / L.

[0014] On the other hand, the present invention provides a test method of the new environmentally friendly insulating gas electrical equipment live test system as described above, comprising the following steps:

[0015] The first end of the power transmission pipeline test prototype is connected to the power frequency test transformer through a first wire, and the housing of the power transmission pipeline test prototype and the housing of the power frequency test transformer are grounded together to form a voltage test loop; the second end of the power transmission pipeline test prototype is connected to one end of the central conductor of the insulator through a second wire, and the other end of the central conductor of the insulator passes through the current booster and is connected to the first end of the power transmission pipeline test prototype through a third wire to form a current test loop;

[0016] The transmission pipeline test prototype is subjected to an energized test of a preset duration in two phases. In the first phase, a full-voltage no-load test is conducted. The power frequency test transformer outputs a preset test voltage. When the voltage reaches 1.1 times or more of the long-term operating voltage peak of the equipment, the preset test voltage is uninterrupted, and the continuous test time is not less than 1 month. In the second phase, a full-voltage high-load test is conducted. The power frequency test transformer outputs a continuous preset test voltage, and the current generator outputs a preset test current. When the voltage reaches 3 times or more of the conventional power grid load current, the preset test voltage is uninterrupted, and the preset test current continues for a preset duration every day, and the test time is not less than 1 month.

[0017] During the test, the gas pressure of the mixed gas and the partial discharge inside the gas-insulated transmission pipeline in the transmission pipeline test prototype are monitored in real time, the gas in the gas-insulated transmission pipeline is collected to detect the mixing ratio, trace water and main component content, and the temperature rise of the first high-voltage guide rod in the gas-insulated transmission pipeline is detected. The detection cycle does not exceed the predetermined time. Based on the test results, it is analyzed whether the insulation performance, gas-solid compatibility and stability of the trifluoromethylsulfonyl fluoride meet the long-term operation requirements of the equipment.

[0018] In summary, the beneficial technical effects of the present invention are as follows: the present application provides a new type of environmentally friendly insulated gas electrical equipment live test system and test method, wherein the new type of environmentally friendly insulated gas electrical equipment live test system includes a transmission pipeline test prototype, an industrial frequency test transformer and a current generator; the transmission pipeline test prototype is filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen, the current generator includes a current booster and an insulator, and the insulator is inserted through the center of the current booster; the first end of the transmission pipeline test prototype is connected to the industrial frequency test transformer through a first wire, the casing of the transmission pipeline test prototype and the casing of the industrial frequency test transformer are grounded together to form a voltage test circuit, the second end of the transmission pipeline test prototype is provided with a current transformer, and the second end of the transmission pipeline test prototype The second wire is connected to one end of the central conductor of the insulator, and the other end of the central conductor of the insulator is connected to the first end of the transmission pipeline test prototype through the third wire to form a current test circuit; the test process is: connect the full voltage and current test circuit - carry out live test - obtain the test result; by setting up a transmission pipeline test prototype filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen, and connecting it with the power frequency test transformer and the current generator to form a full voltage and current test circuit, it can carry out long-term full voltage no-load test and full voltage high load test, which is consistent with the actual operating conditions of the equipment, can truly detect the gas and equipment status during the test, and judge and analyze whether the insulation performance, gas-solid compatibility and stability of the gas and the equipment performance meet the long-term reliable operation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a new type of environmentally friendly insulating gas electrical equipment live test system provided by an embodiment of the present invention.

[0020] Figure 2 It is a structural schematic diagram of a power transmission pipeline test prototype in a new type of environmentally friendly insulating gas electrical equipment live test system provided by an embodiment of the present invention.

[0021] Figure 3 It is a flow chart of a test method of a new type of environmentally friendly insulating gas electrical equipment live test system provided by another embodiment of the present invention.

[0022] In the figure, 1. A new type of environmentally friendly insulated gas electrical equipment live test system; 10. A transmission pipeline test prototype; 11. A gas insulated transmission pipeline; 111. A pipeline casing; 1111. An environmentally friendly gas chamber; 112. A first high-voltage guide rod; 113. A support insulator; 114. A pot-type insulator; 12. A transition unit; 121. A high-voltage bushing; 122. A pipeline casing; 1221. A sealing plate; 1222. A transition gas chamber; 123. A second high-voltage guide rod; 124. A center guide rod; 125. A bushing flange; 13. A base support frame; 20. An industrial frequency test transformer; CT, a current transformer; 30. A current generator; 31. A current booster; 32. An insulator; 321. A center conductor; 40. A first conductor; 50. A second conductor; 60. A third conductor. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0024] Reference Figure 1 and Figure 2 The invention discloses a novel environmentally friendly insulated gas electrical equipment live test system 1, comprising a transmission pipeline test prototype 10, a power frequency test transformer 20 and a current generator 30; the transmission pipeline test prototype 10 is filled with trifluoromethylsulfonyl fluoride and nitrogen (CF 3 SO 2 F / N 2 ) of mixed gas, the current generator 30 includes a current booster 31 and an insulator 32, and the insulator 32 is arranged at the center of the current booster 31; the first end of the transmission pipeline test prototype 10 is connected to the power frequency test transformer 20 through the first wire 40, the shell of the transmission pipeline test prototype 10 and the shell of the power frequency test transformer 20 are grounded together to form a voltage test loop, the second end of the transmission pipeline test prototype 10 is provided with a current transformer CT, and the second end of the transmission pipeline test prototype is connected to one end of the central conductor 321 of the insulator 32 through the second wire 50, and the other end of the central conductor 321 of the insulator 32 is connected to the first end of the transmission pipeline test prototype 10 through the third wire 60 to form a current test loop; such a setting can carry out a long-term live test with voltage and current applied at the same time, which is consistent with the actual operating conditions of the equipment, can truly detect the gas and equipment status during the test, and judge and analyze whether the insulation performance, gas-solid compatibility and stability of the gas and the equipment performance meet the long-term reliable operation requirements.

[0025] It should be noted that the power transmission pipeline test prototype 10 adopts a 126 kV power transmission pipeline test prototype 10 .

[0026] Specifically, Figure 1As shown, the first end of the power transmission pipeline test prototype 10 is connected to the power frequency test transformer 20 through the first wire 40, and the shell of the power transmission pipeline test prototype 10 and the shell of the power frequency test transformer 20 are grounded together to form a voltage test loop; the second end of the power transmission pipeline test prototype 10 is connected to one end of the central conductor 321 of the insulator 32 through the second wire 50, and the other end of the central conductor 321 of the insulator 32 passes through the current booster and is connected to the first end of the power transmission pipeline test prototype 10 through the third wire 60 to form a current test loop.

[0027] The test process of the new environmentally friendly insulated gas electrical equipment live test system 1 provided in this embodiment is as follows: a long-term live test is carried out on the transmission pipeline test prototype 10 in two stages. In the first stage, a full-voltage no-load test is carried out, and the power frequency test transformer 20 outputs a preset test voltage (i.e., 115KV). When the voltage reaches 1.1 times the peak value of the long-term operation voltage of the equipment, and above, the preset test voltage is uninterrupted, and the continuous test time is not less than 1 month; in the second stage, a full-voltage large-load test is carried out, and the power frequency test transformer 20 outputs a continuous preset test voltage (i.e. 115KV), and the current generator 30 outputs a preset test current (i.e. the equipment rated current 2500A). When it reaches 3 times or more of the conventional 110KV power grid load current, the preset test voltage is uninterrupted, and the preset test current continues for a preset time (i.e. 12h) every day, and the test time is not less than 1 month; according to the test results, analyze whether the insulation performance, gas-solid compatibility and stability of the trifluoromethylsulfonyl fluoride meet the long-term operation requirements of the equipment.

[0028] Among them, trifluoromethylsulfonyl fluoride and nitrogen (CF 3 SO 2 F / N 2 ) gas pressure range is 0.5~0.9Mpa; trifluoromethylsulfonyl fluoride and nitrogen (CF 3 SO 2 F / N 2 ) in a mixed gas of 10% to 50% by volume of trifluoromethylsulfonyl fluoride; trifluoromethylsulfonyl fluoride and nitrogen (CF 3 SO 2 F / N 2 ) has a water content of less than 100 μL / L. In this embodiment, trifluoromethylsulfonyl fluoride and nitrogen (CF 3 SO 2 F / N 2 ) has a gas pressure of 0.7 MPa; the volume percentage of trifluoromethylsulfonyl fluoride is 14%; trifluoromethylsulfonyl fluoride and nitrogen (CF 3 SO 2 F / N 2) has a water content of 75 μL / L.

[0029] Furthermore, in this embodiment, the power transmission pipeline test prototype 10 includes a gas-insulated power transmission pipeline 11 and two transition units 12, the two transition units 12 are respectively arranged at opposite ends of the gas-insulated power transmission pipeline 11, and the gas-insulated power transmission pipeline 11 and the two transition units 12 are filled with trifluoromethylsulfonyl fluoride and nitrogen (CF 3 SO 2 F / N 2 ) of a mixed gas.

[0030] Specifically, Figure 1 Taking the shown orientation as an example, the two transition units 12 include a first transition unit 12 and a second transition unit 12. The transition unit 12 located on the left side of the gas-insulated power transmission pipeline 11 is the first transition unit 12, and the transition unit 12 located on the right side of the gas-insulated power transmission pipeline 11 is the second transition unit 12.

[0031] During use, the top of the first transition unit 12 is connected to the power frequency test transformer 20 through the first wire 40, the current transformer CT is installed at the top of the second transition unit 12, one end of the central conductor 321 of the insulator 32 is connected to the top of the second transition unit 12 through the second wire 50, and the other end of the central conductor 321 of the insulator 32 passes through the current booster and is connected to the top of the first transition unit 12 through the third wire 60.

[0032] In this embodiment, the power transmission pipeline test prototype 10 further includes at least two base support frames 13 , and the two base support frames 13 are respectively disposed on the outer shells of the bottom surfaces of the two transition units 12 .

[0033] Furthermore, in this embodiment, the gas-insulated transmission pipeline 11 includes a pipeline casing 111, a first high-voltage conductor 112 and at least one support insulator 113. The pipeline casing 111 is enclosed into an environmentally friendly gas chamber 1111. Basin insulators 114 are provided at opposite ends of the pipeline casing 111 to close the pipeline casing 111. The first high-voltage conductor 112 and the support insulator 113 are both arranged in the environmentally friendly gas chamber 1111. The opposite ends of the first high-voltage conductor 112 are respectively connected to two basin insulators 114, the top end of the support insulator 113 is connected to the first high-voltage conduit, the bottom end of the support insulator 113 is connected to the inner wall of the environmentally friendly gas chamber 1111, and the support insulator 113 and the basin insulator 114 are arranged at intervals; the environmentally friendly gas chamber 1111 is filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen.

[0034] Specifically, the center line of the first high-pressure guide rod 112 is arranged parallel to the center line of the pipeline housing 111 .

[0035] Furthermore, in this embodiment, a hand hole and an inflation port are provided on the pipe shell 111, both of which are connected to the environmental protection air chamber 1111, a cover plate is provided on the hand hole, a glass window is installed on the cover plate, and a first special air pressure gauge is installed on the inflation port.

[0036] Continue to refer to Figure 1 and Figure 2 In this embodiment, the transition unit 12 includes a high-voltage bushing 121, a pipe shell 122, a second high-voltage guide rod 123 and a central guide rod 124. The bottom end of the high-voltage bushing 121 is connected to the pipe shell 122 through a bushing flange 125. One end of the pipe shell 122 is connected to the pot-type insulator 114. A sealing plate 1221 is provided at one end of the pipe shell 122 away from the pot-type insulator 114. The pipe shell 122 is surrounded by a transition air chamber 1222. The transition air chamber 1222 is connected to the cavity of the high-voltage bushing 121. The transition air chamber 1222 is filled with trifluoromethylsulfonyl fluoride and nitrogen (CF 3 SO 2 F / N 2 ) of a mixed gas; the bottom end of the center guide rod 124 passes through the high-voltage bushing 121 and is inserted into the transition air chamber 1222, and the top end of the center guide rod 124 extends outward along the center line direction of the high-voltage bushing 121; the second high-voltage guide rod 123 is arranged in the transition air chamber 1222, one end of the second high-voltage guide rod 123 is connected to the first high-voltage guide rod 112 through the basin insulator 114, and the other end of the second high-voltage guide rod 123 is connected to the bottom end of the center guide rod 124.

[0037] Furthermore, in this embodiment, an air inlet is provided on the pipeline shell 122 , the air inlet is communicated with the transition air chamber 1222 , and a second dedicated air pressure gauge is installed on the air inlet.

[0038] It should be noted that the high voltage bushing 121 and the transition air chamber 1222 share one air chamber.

[0039] Specifically, the center line of the high-voltage bushing 121 is perpendicular to the center line of the pipe shell 122 , and the center line of the pipe shell 122 is parallel to the center line of the pipe shell 111 . In some practicable embodiments, the center line of the pipe shell 122 is colinear with the center line of the pipe shell 111 .

[0040] In this embodiment, the transition air chamber 1222 is separated from the environmental protection air chamber 1111 by a basin-type insulator 114, the center line of the second high-voltage guide rod 123 is arranged parallel to the center line of the first high-voltage guide rod 112, the center line of the second high-voltage guide rod 123 is arranged perpendicular to the center line of the center guide rod 124, and the center guide rod 124 is connected to the basin-type insulator 114 and the second high-voltage guide rod 123 through the second high-voltage guide rod 123.

[0041] The two transition air chambers 1222 and one environmental air chamber 1111 are filled with CF 3 SO 2 F / N 2 Mixed gas, using the electrostatic field and temperature rise numerical calculation method, applied a voltage of 550kV to the first high-voltage conductor 112, and calculated that the maximum electric field strength on the outer surface of the first high-voltage conductor 112 is not less than 24kV / mm, and the maximum electric field strength along the surface of the support insulator 113 and the basin insulator 114 is not less than 12kV / mm; a current of 2750A is applied to the first high-voltage conductor 112, and the maximum temperature rise of the first high-voltage conductor 112 is not less than 70K.

[0042] During use, the top of the central guide rod 124 in the first transition unit 12 is connected to the power frequency test transformer 20 through the first wire 40, and the pipeline housing 111 and the shell of the power frequency test transformer 20 are grounded together to form a voltage test circuit; a current transformer CT is installed on the top of the central guide rod 124 of the second transition unit 12, one end of the central conductor 321 of the insulator 32 is connected to the top of the central guide rod 124 of the second transition unit 12 through the second wire 50, and the other end of the central conductor 321 of the insulator 32 passes through the current booster and is connected to the top of the central guide rod 124 of the first transition unit 12 through the third wire 60 to form a current test circuit; then, a long-term live test is carried out on the power transmission pipeline test prototype 10 in two stages. The first stage is In the first stage, a full-voltage no-load test is carried out. The power frequency test transformer 20 outputs a preset test voltage (i.e., 115KV). When it reaches 1.1 times (126 / √3*√2*1.1=113KV) or more of the long-term operating voltage peak of the equipment, the preset test voltage is uninterrupted, and the continuous test time is not less than 1 month; in the second stage, a full-voltage high-load test is carried out. The power frequency test transformer 20 outputs a continuous preset test voltage (i.e., 115KV), and the current generator 30 outputs a preset test current (i.e., the equipment rated current is 2500A). When it reaches 3 times or more of the load current of the conventional 110KV power grid, the preset test voltage is uninterrupted, and the preset test current continues for a preset time every day (i.e., 12h), and the test time is not less than 1 month; during the test, real-time monitoring of CF 3 SO 2 F / N 2 The mixed gas pressure and the partial discharge inside the gas-insulated transmission pipeline 11 are collected, and the gas sample in the environmental protection gas chamber 1111 is detected to detect the mixing ratio, trace water and main component content; the temperature rise of the first high-voltage guide rod 112 in the gas-insulated transmission pipeline 11 is detected through the glass window, wherein the detection cycle does not exceed 5 days, and the CF is analyzed according to the detection results. 3 SO 2 F and CF 3 SO 2 F / N 2Whether the key properties of the mixed gas, such as insulation performance, gas-solid compatibility and stability, meet the long-term operation requirements of electrical equipment.

[0043] Continue to refer to Figure 3 Another embodiment provides a test method of the new environmentally friendly insulating gas electrical equipment live test system 1 as described above, comprising the following steps:

[0044] S101. Connect the first end of the power transmission pipeline test prototype 10 to the power frequency test transformer 20 through the first conductor 40, and the casing of the power transmission pipeline test prototype 10 and the casing of the power frequency test transformer 20 are grounded together to form a voltage test circuit; connect the second end of the power transmission pipeline test prototype 10 to one end of the central conductor 321 of the insulator 32 through the second conductor 50, and the other end of the central conductor 321 of the insulator 32 passes through the current booster and is connected to the first end of the power transmission pipeline test prototype 10 through the third conductor 60 to form a current test circuit.

[0045] Specifically, the top end of the center guide rod 124 in the first transition unit 12 is connected to the power frequency test transformer 20 through the first wire 40, and the pipeline housing 111 and the shell of the power frequency test transformer 20 are grounded together to form a voltage test circuit; a current transformer CT is installed at the top end of the center guide rod 124 of the second transition unit 12, and one end of the center conductor 321 of the insulator 32 is connected to the top end of the center guide rod 124 of the second transition unit 12 through the second wire 50, and the other end of the center conductor 321 of the insulator 32 passes through the current booster and is connected to the top end of the center guide rod 124 of the first transition unit 12 through the third wire 60 to form a current test circuit.

[0046] Among them, the electrostatic field and temperature rise numerical calculation method is adopted for the 126kV transmission pipeline test prototype 10, wherein a voltage of 550kV is applied to the first high-voltage conductor 112, and it is calculated that the maximum electric field strength on the outer surface of the first high-voltage conductor 112 is 24.9kV / mm, and the maximum electric field strength along the surface of the support insulator 113 and the basin insulator 114 is 12.4kV / mm; a current of 2750A is applied to the first high-voltage conductor 112, and the maximum temperature rise of the first high-voltage conductor 112 is 74K.

[0047] S102. Conduct an energized test of a preset duration on the transmission pipeline test prototype 10 in two phases. In the first phase, a full-voltage no-load test is conducted, and the power frequency test transformer 20 outputs a preset test voltage. When the voltage reaches 1.1 times or more of the long-term operating voltage peak of the equipment, the preset test voltage is uninterrupted, and the continuous test time is not less than 1 month. In the second phase, a full-voltage high-load test is conducted, and the power frequency test transformer 20 outputs a continuous preset test voltage, and the current generator 30 outputs a preset test current. When the voltage reaches 3 times or more of the conventional power grid load current, the preset test voltage is uninterrupted, and the preset test current continues for a preset time every day, and the test time is not less than 1 month.

[0048] Specifically, a long-term live test is carried out on the transmission pipeline test prototype 10 in two stages. In the first stage, a full-voltage no-load test is carried out. The power frequency test transformer 20 outputs a preset test voltage (i.e., 115KV). When it reaches 1.1 times (126 / √3*√2*1.1=113KV) or more of the long-term operating voltage peak of the equipment, the preset test voltage is uninterrupted, and the continuous test time is 40 days; in the second stage, a full-voltage large-load test is carried out. The power frequency test transformer 20 outputs a continuous preset test voltage (i.e., 115KV) and the current generator 30 outputs a preset test current (i.e., the equipment rated current is 2500A). When it reaches 3 times or more of the load current of the conventional 110KV power grid, the preset test voltage is uninterrupted, and the preset test current continues for a preset time (i.e., 12h) every day, and the total test time reaches 90 days.

[0049] S103. During the test, the gas pressure of the mixed gas and the partial discharge inside the gas-insulated transmission pipeline 11 in the transmission pipeline test prototype 10 are monitored in real time, the gas in the gas-insulated transmission pipeline 11 is collected to detect the mixing ratio, trace water and main component content, and the temperature rise of the first high-voltage guide rod 112 in the gas-insulated transmission pipeline 11 is detected. The detection cycle does not exceed the predetermined time. Based on the test results, it is analyzed whether the insulation performance, gas-solid compatibility and stability of trifluoromethylsulfonyl fluoride meet the long-term operation requirements of the equipment.

[0050] Specifically, during the experiment, CF was monitored in real time. 3 SO 2 F / N 2 Mixed gas pressure and partial discharge inside the gas-insulated transmission pipeline 11, collect gas samples in the environmental protection gas chamber 1111, detect the mixing ratio, trace water and main component content; detect the temperature rise of the first high-voltage guide rod 112 in the gas-insulated transmission pipeline 11 through a glass window, where the detection cycle is 3 days; the detection result is that the pressure changes of the two transition gas chambers 1222 and one environmental protection gas chamber 1111 do not exceed 0.1MPa, and no internal partial discharge is detected; CF 3 SO 2The volume percentage of F did not change by more than ±0.5%, and the maximum water content was 120 μL / L, except for CF 3 SO 2 F, N 2 In addition, the main gas components detected were CF 4 , CO, the total content of these two gases is less than 1000μL / L, which shows that the new environmentally friendly insulating gas CF 3 SO 2 F and CF 3 SO 2 F / N 2 The key properties of the mixed gas, such as insulation performance, gas-solid compatibility and stability, all meet the long-term operation requirements of electrical equipment.

[0051] The present application provides a new environmentally friendly insulated gas electrical equipment live test system 1 and a test method, wherein the new environmentally friendly insulated gas electrical equipment live test system 1 includes a transmission pipeline test prototype 10, a power frequency test transformer 20 and a current generator 30; the transmission pipeline test prototype 10 is filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen, the current generator 30 includes a current booster 31 and an insulator 32, and the insulator 32 is penetrated on the current booster 31; the first end of the transmission pipeline test prototype 10 is connected to the power frequency test transformer 20 through a first wire 40, and the outer end of the transmission pipeline test prototype 10 is connected to the power frequency test transformer 20 through a first wire 40. The shell of the power frequency test transformer 20 is grounded together to form a voltage test loop. The second end of the power transmission pipeline test prototype 10 is provided with a current transformer, and the second end of the power transmission pipeline test prototype 10 is connected to one end of the central conductor 321 of the insulator 32 through a second wire 50, and the other end of the central conductor 321 of the insulator 32 is connected to the first end of the power transmission pipeline test prototype 10 through a third wire 60 to form a current test loop. The test process is: connect the full voltage and current test loop - carry out live test - obtain the test result; by setting up a filling of trifluoromethylsulfonyl fluoride and nitrogen (CF 3 SO 2 F / N 2 ) is connected with the power frequency test transformer 20 and the current generator 30 to form a full voltage and current test circuit, which can carry out long-term full voltage no-load test and full voltage high load test, which is consistent with the actual operating conditions of the equipment, can truly detect the gas and equipment status during the test, and judge and analyze the insulation performance, gas-solid compatibility and stability of the gas and whether the equipment performance meets the long-term reliable operation requirements.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0053] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A new type of environmentally friendly insulating gas electrical equipment live test system, characterized by: Including transmission pipeline test prototype, power frequency test transformer and current generator; The transmission pipeline test prototype is filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen, the current generator includes a current riser and an insulator, and the insulator is inserted through the center of the current riser; The first end of the power transmission pipeline test prototype is connected to the power frequency test transformer through a first wire, and the casing of the power transmission pipeline test prototype and the shell of the power frequency test transformer are grounded together to form a voltage test circuit. The second end of the power transmission pipeline test prototype is provided with a current transformer, and the second end of the power transmission pipeline test prototype is connected to one end of the central conductor of the insulator through a second wire, and the other end of the central conductor of the insulator is connected to the first end of the power transmission pipeline test prototype through a third wire to form a current test circuit.

2. The new environmentally friendly insulating gas electrical equipment live test system according to claim 1 is characterized by: The power transmission pipeline test prototype includes a gas-insulated power transmission pipeline and two transition units, wherein the two transition units are respectively arranged at opposite ends of the gas-insulated power transmission pipeline, and the gas-insulated power transmission pipeline and the two transition units are both filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen.

3. The new environmentally friendly insulating gas electrical equipment live test system according to claim 2 is characterized by: The gas-insulated power transmission pipeline comprises a pipeline casing, a first high-voltage guide rod and at least one support insulator, the pipeline casing is arranged to form an environmentally friendly gas chamber, pot-type insulators are arranged at opposite ends of the pipeline casing to close the pipeline casing, the first high-voltage guide rod and the support insulator are arranged in the environmentally friendly gas chamber, the opposite ends of the first high-voltage guide rod are respectively connected to two pot-type insulators, the top end of the support insulator is connected to the first high-voltage conduit, the bottom end of the support insulator is connected to the inner wall of the environmentally friendly gas chamber, and the support insulator and the pot-type insulator are arranged at intervals; The environmental protection gas chamber is filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen.

4. The new environmentally friendly insulating gas electrical equipment live test system according to claim 3 is characterized by: A hand hole and an air charging port are provided on the pipe shell, both of which are connected to the environmental protection air chamber. A cover plate is provided on the hand hole, a glass window is installed on the cover plate, and a first special air pressure gauge is installed on the air charging port.

5. The new environmentally friendly insulating gas electrical equipment live test system according to any one of claims 3-4, characterized in that: The transition unit comprises a high-voltage bushing, a pipeline housing, a second high-voltage guide rod and a central guide rod, the bottom end of the high-voltage bushing is connected to the pipeline housing through a bushing flange, one end of the pipeline housing is connected to the pot-type insulator, a sealing plate is provided at one end of the pipeline housing away from the pot-type insulator, the pipeline housing is surrounded to form a transition air chamber, the transition air chamber is communicated with the cavity of the high-voltage bushing, and the transition air chamber is filled with a mixed gas of trifluoromethylsulfonyl fluoride and nitrogen; The bottom end of the center guide rod passes through the high-voltage bushing and is inserted into the transition air chamber, and the top end of the center guide rod extends outward along the center line direction of the high-voltage bushing; the second high-voltage guide rod is arranged in the transition air chamber, one end of the second high-voltage guide rod is connected to the first high-voltage guide rod through the pot-type insulator, and the other end of the second high-voltage guide rod is connected to the bottom end of the center guide rod.

6. The new environmentally friendly insulating gas electrical equipment live test system according to claim 5 is characterized by: An air inlet is provided on the pipeline shell, the air inlet is communicated with the transition air chamber, and a second special air pressure gauge is installed on the air inlet.

7. The new environmentally friendly insulating gas electrical equipment live test system according to claim 1 is characterized by: The gas pressure of the mixed gas of trifluoromethylsulfonyl fluoride and nitrogen is in the range of 0.5 to 0.9 MPa.

8. The new environmentally friendly insulating gas electrical equipment live test system according to claim 1 is characterized by: The volume proportion of trifluoromethylsulfonyl fluoride in the mixed gas of trifluoromethylsulfonyl fluoride and nitrogen is 10% to 50%.

9. The new environmentally friendly insulating gas electrical equipment live test system according to claim 1 is characterized by: The water content of the mixed gas of trifluoromethylsulfonyl fluoride and nitrogen is less than 100 μL / L.

10. A test method for a new environmentally friendly insulating gas electrical equipment live test system as claimed in any one of claims 1 to 9, characterized in that: The steps include: The first end of the power transmission pipeline test prototype is connected to the power frequency test transformer through a first wire, and the housing of the power transmission pipeline test prototype and the housing of the power frequency test transformer are grounded together to form a voltage test loop; the second end of the power transmission pipeline test prototype is connected to one end of the central conductor of the insulator through a second wire, and the other end of the central conductor of the insulator passes through the current booster and is connected to the first end of the power transmission pipeline test prototype through a third wire to form a current test loop; The transmission pipeline test prototype is subjected to an energized test of a preset duration in two phases. In the first phase, a full-voltage no-load test is conducted. The power frequency test transformer outputs a preset test voltage. When the voltage reaches 1.1 times or more of the long-term operating voltage peak of the equipment, the preset test voltage is uninterrupted, and the continuous test time is not less than 1 month. In the second phase, a full-voltage high-load test is conducted. The power frequency test transformer outputs a continuous preset test voltage, and the current generator outputs a preset test current. When the voltage reaches 3 times or more of the conventional power grid load current, the preset test voltage is uninterrupted, and the preset test current continues for a preset duration every day, and the test time is not less than 1 month. During the test, the gas pressure of the mixed gas and the partial discharge inside the gas-insulated transmission pipeline in the transmission pipeline test prototype are monitored in real time, the gas in the gas-insulated transmission pipeline is collected to detect the mixing ratio, trace water and main component content, and the temperature rise of the first high-voltage guide rod in the gas-insulated transmission pipeline is detected. The detection cycle does not exceed the predetermined time. Based on the test results, it is analyzed whether the insulation performance, gas-solid compatibility and stability of the trifluoromethylsulfonyl fluoride meet the long-term operation requirements of the equipment.

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