CN203502581U - AIS electronic transformer test system based on disconnecting switch switching-on and switching-off capacitive small current - Google Patents
AIS electronic transformer test system based on disconnecting switch switching-on and switching-off capacitive small current Download PDFInfo
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- CN203502581U CN203502581U CN201320558514.XU CN201320558514U CN203502581U CN 203502581 U CN203502581 U CN 203502581U CN 201320558514 U CN201320558514 U CN 201320558514U CN 203502581 U CN203502581 U CN 203502581U
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Abstract
An AIS electronic transformer test system based on disconnecting switch switching-on and switching-off capacitive small current comprises a high-voltage test transformer, a capacitive voltage divider, an AIS type disconnecting switch, a primary current and voltage transient state measurement system, and an electronic transformer to be tested which are connected on a primary lead, one end of the a secondary converter is connected with the electronic transformer to be tested, the other end is connected with a merging unit, the other end of the merging unit is connected with a fault recorder, the fault recorder is used for being connected with output of the merging unit, and the placing position of the merging unit is 5 m to 10 m away from the horizontal position of the AIS type disconnecting switch. Voltage values and current values of the primary lead are tested when the disconnecting switch is switched on and switched off, thereby being compared with output of a product to be tested. Through the test system, electromagnetic environments of 110kV, 220kV, and 500kV voltage classes in power transmission and power cut-off processes can be simulated, the process of the field disconnecting switch switching on and switching off an empty lead and a capacitive small current load is simulated, analogous field transient state strong interference is generated, and the electromagnetic protective performance of the electronic transformer is examined under such conditions.
Description
Technical field
The utility model relates to a kind of test macro of testing electric mutual inductor, concrete, relates to a kind of AIS electric mutual inductor test macro based on the disconnector deciliter little electric current of capacitive.
Background technology
Along with the construction of intelligent grid, in intelligent grid, used widely electric mutual inductor.The strategic objective of " building unified strong intelligent grid " that State Grid Corporation of China's science and technology development planning proposes, the quality and performance to electric mutual inductor product, product reliability of operation, stability and degree of accuracy are had higher requirement.And wherein electromagnetic interference (EMI) is a key factor that affects electric mutual inductor reliability and stability.
For the detection of electric mutual inductor electromagnetic compatibility, be familiar with and also rest on the basis of existing standard at present both at home and abroad, its pilot project and technical requirement can not meet the actual needs of the electronic equipment moving in voltage levels completely.The application time of domestic electric mutual inductor is not long, and it is also very not remarkable that the problem of its electromagnetic compatibility exposes, but due to the vital role of electric mutual inductor in electric system, payes attention to electromagnetic compatibility problem just very necessary.
From type, characteristic and its interference and coupling path to electric mutual inductor of the common electromagnetic interference (EMI) of transformer station, can find out, in substation, the reason that electric mutual inductor is easily disturbed is mainly because its equipment more approaches primary circuit, under the condition of switching manipulation, system short-circuit, by direct conduction and electromagnetic field couples, be more easily interfered, and its layout, merge cells and supply module thereof are also very easy to produce interference by the reason of electromagnetic radiation or Ground Electric Potential Rise.And the interference level that the intensity of these interference is stipulated considerably beyond current electromagnetic compatibility standard, this is also that current electric mutual inductor has passed through EMC test, occurs at the scene the main cause of electromagnetic protection fault.In order thoroughly to verify that at the scene under condition, electric mutual inductor resists strongly disturbing ability, just must adopt and the immediate test method of actual conditions is verified.The test macro of EMC test that needs to study for this reason and propose a kind of satisfied on-the-spot electromagnetic protection requirement, for test, to improve the barrier propterty of electric mutual inductor, reduces the failure rate of electromagnetic protection.
Utility model content
The purpose of this utility model is to propose the AIS electric mutual inductor test macro based on the disconnector deciliter little electric current of capacitive, make it possible to the various electromagnetic radiation that simulation system is subject to, and then meet the EMC test of on-the-spot electromagnetic protection requirement, to improve the barrier propterty of electric mutual inductor, reduce the failure rate of electromagnetic protection.
For reaching this object, the utility model by the following technical solutions:
A kind of test macro of the AIS electric mutual inductor based on the disconnector deciliter little electric current of capacitive, described test macro comprises HT testing transformer, capacitive divider, AIS formula disconnector, primary current voltage transient measuring system, electric mutual inductor to be measured, secondary converter, merge cells, failure wave-recording instrument, is characterized in that:
Described HT testing transformer; described capacitive divider; described AIS formula disconnector; described primary current voltage transient measuring system; described electric mutual inductor to be measured is connected on a wire successively; described secondary converter one end connects described electric mutual inductor to be measured; the other end connects described merge cells; the other end of described merge cells connects described fault oscillograph; described fault oscillograph is for connecting the output of described merge cells, and described merge cells riding position is apart from described AIS formula disconnector horizontal level 5m-10m;
Described electric mutual inductor to be measured is electronic current mutual inductor or electronic type voltage transformer;
On a described wire, be parallel with load capacitance, described load capacitance is for simulating the load capacitance of actual motion circuit;
Described primary current voltage transient measuring system comprise be connected in parallel on transient current transformer of a calibration on wire and calibration transient voltage mutual inductor, high-speed collection card and a measurement host computer, described high-speed collection card gathers respectively the output of transient current transformer of described calibration and a transient voltage mutual inductor of described calibration, and is transferred to described measurement host computer by data transfer mode.
Further, described AIS formula disconnector deciliter the little current values of capacitive be 0.1-0.8A.
Further, described HT testing transformer output test voltage magnitude is identical with the rated operational voltage of described electric mutual inductor to be measured.
Further, the output current of described HT testing transformer is 2A; Described AIS formula disconnector is joined electric operating mechanism and alternating current 220V operating power.
Further, transient voltage mutual inductor of described calibration comprises induction electrode, film and shielded box, described induction electrode and described film are positioned at described shielded box, and described film is between described induction electrode and described shielded box, described shielded box is connected with insulation column, and in identical current potential, between described induction electrode and described shielded box, accompany film described in one deck, form an arm of a transient voltage mutual inductor of described calibration, between described induction electrode and the earth, stroke forms another arm of a transient voltage mutual inductor of described calibration, form transient voltage mutual inductor of described calibration,
Transient voltage mutual inductor of described calibration is for being enclosed within this lubber ring of Kenneth Rogoff current measurement place of a described wire, outputing to described high-speed collection card measures, utilize shading ring that this lubber ring of described Kenneth Rogoff is placed in to described shading ring inner, described high speed acquisition is placed in described shielded box, form an integral body with described shading ring, it is inner that transient voltage mutual inductor of described calibration and transient voltage mutual inductor of described calibration are arranged on same described shielded box, shares the two paths of described high-speed collection card.
Therefore, according to the AIS electric mutual inductor test macro based on the disconnector deciliter little electric current of capacitive of the present utility model, magnitude of voltage and current value during the folding of test disconnector on a wire, thus compare with the output of test product to be measured.Like this, can build 220kV, the little current test loop of 500kV disconnector deciliter capacitive in testing laboratory, simultaneously by electric mutual inductor series connection access test loop, the little current capacity process of simulated field disconnector folding hollow wire and capacitive, produce similar on-the-spot transient state strong jamming, the electromagnetic protection performance of examination electric mutual inductor under this condition.This test platform can be used for 110Ky, 220kV, the electromagnetic environment of 500kV electric pressure in power transmission and power process.
Accompanying drawing explanation
Fig. 1 is the test circuit of the electronic current mutual inductor based on the utility model embodiment;
Fig. 2 is the test circuit of the electronic type voltage transformer based on the utility model embodiment;
Fig. 3 is the primary current voltage transient measuring system schematic diagram based on the utility model embodiment;
Fig. 4 is a transient voltage transformer device figure based on the utility model embodiment;
The technical characterictic that Reference numeral in figure refers to is respectively:
101, HT testing transformer; 102, capacitive divider; 103, AIS formula disconnector; 104, a transient current transformer of calibration; 105, a transient voltage mutual inductor of calibration; 106, high-speed collection card; 107, measure host computer; 108, electronic current mutual inductor to be measured; 109, electronic type voltage transformer to be measured; 110, secondary converter; 111, merge cells; 112, fault recorded broadcast instrument; 113, load capacitance; 200, primary current voltage transient measuring system; 301, induction electrode; 302, film; 303, shielded box; 304, insulation column; 305, the earth.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the utility model, but not to restriction of the present utility model.It also should be noted that, for convenience of description, in accompanying drawing, only show the part relevant to the utility model but not entire infrastructure.
Transformer station's electromagnetic environment mainly comprises in several situations such as disconnector and breaker operator, thunder and lightning and system short-circuit, the strong electromagnetic phenomenon causing in transformer station.
Test for the lightning impulse test carrying out in testing laboratory as examination electric mutual inductor anti-electromagnetic interference capability; consider energy and the whole test deployment scenarios of artificial lightning impulse test; the lightning impulse test carrying out in testing laboratory is poor larger frequently along the condition of lightning rod electric discharge in transformer station with real thunder and lightning, is first that amplitude of lightning current, the energy of artificial condition Imitating is all obviously weaker than reality; Next is that in artificial test, layout and the reality of the equipment of participating in the experiment are not obviously inconsistent.Therefore artificial Lightning Test completely simulated field is actual, and its test effect can be not very good.
Also there is Similar Problems in artificial earthing's test of carrying out in testing laboratory, its greatest drawback is that manual simulation's condition and the actual conditions difference of short-circuit current is large, its amplitude, duration etc. are obviously weaker than actual conditions, therefore under artificial earthing's test condition, also insufficient to the examination of electric mutual inductor antijamming capability.True type artificial earthing's test that Ruo transformer station carries out 1:1 can provide reasonable test condition, and so that the examination to electric mutual inductor to be provided, but the danger of this kind of test is large, and the interior most weak current equipment of standing is had to strong interference.Test may cause other unnecessary loss or leave hidden danger, thereby transformer station is normally moved and has certain harm in the future, therefore in electric system, seldom similarly tests.
Therefore all there is obvious defect in artificial lightning impulse and artificial earthing's test.By theoretical analysis and practical experience, the operation of on-the-spot disconnector can produce stronger electromagnetic interference (EMI), and the feature of disconnector interference source is as follows:
1) in primary circuit, produce superpotential, amplitude range 1.0p.u.～2.8p.u.;
2) in primary circuit, produce high-frequency pulse current, amplitude range is in several kilo-amperes;
3) primary voltage power frequency wide ranges, 50Hz～100MHz;
4) harassing and wrecking the duration long, 200ms～several seconds;
5) arc through-extinguish discharge time is many, and hundreds of is to thousands of times;
6) produce electromagnetic radiation;
7) produce shell potential rise, amplitude range, several kilovolts to tens kilovolts.
Therefore known, disconnector interference source is a kind of high-intensity interference source, if for checking the electromagnetic compatibility test of electric mutual inductor, can examine to greatest extent the electromagnetic protection performance of electric mutual inductor.Disconnector is in deciliter capacitor process, in single test loop, will produce repeatedly arc through and extinguish transient state process, this transient state process will produce multiple pulses electric current, transient overvoltage and pulsed magnetic field, utilize normal voltage in primary circuit and numerical value the record of normalized current sensor measurement primary voltage electric current, record tested electric mutual inductor in output valve after merge cells simultaneously, according to the primary voltage measuring, the duty of electric mutual inductor in whole process of the test compared and observed to the output characteristics of current waveform numerical value and tested electric mutual inductor, just can differentiate the electromagnetism interference free performance of tested electric mutual inductor.
Embodiment mono-:
Referring to accompanying drawing 1, the test circuit according to electronic current mutual inductor of the present utility model is disclosed.This test circuit comprises HT testing transformer 101, for the protection of the capacitive divider 102 of power supply, and AIS formula disconnector 103; primary current voltage transient measuring system 200, electronic current mutual inductor 108 to be measured, secondary converter 110; merge cells 111, failure wave-recording instrument 112.Wherein HT testing transformer 101, capacitive divider 102, AIS formula disconnector 103, primary current voltage transient measuring system 200, electronic current mutual inductor 108 to be measured is connected on a wire successively, and secondary converter 110 one end connect electronic current mutual inductor 108 to be measured, the other end connects merge cells 111, the other end of merge cells 111 connects fault oscillograph 112, and fault oscillograph 112 is for connecting the output of merge cells 111.
Primary current voltage transient measuring system 200 can be conventional primary current voltage transient measuring system, but preferential, can be the primary current voltage transient measuring system of for example embodiment 2.
Referring to accompanying drawing 2; test circuit according to electronic type voltage transformer of the present utility model is disclosed; it is identical with Fig. 1; difference is only that electronic current mutual inductor 108 to be measured is replaced by electronic type voltage transformer 109 to be measured; this test circuit comprises HT testing transformer 101; capacitive divider 102 for the protection of power supply; AIS formula disconnector 103; primary current voltage transient measuring system 200; electronic type voltage transformer 109 to be measured; secondary converter 110, merge cells 111, failure wave-recording instrument 112.Wherein, HT testing transformer 101, capacitive divider 102, AIS formula disconnector 103, primary current voltage transient measuring system 200, electronic type voltage transformer 109 to be measured is connected on a wire successively, secondary converter 110 one end connect electronic current mutual inductor 108 to be measured, the other end connects merge cells 111, and the other end of merge cells 111 connects fault oscillograph 112, and fault oscillograph 112 is for connecting the output of merge cells 111.
Electronic current mutual inductor 108 can independent measurement to be measured and electronic type voltage transformer 109 to be measured, also simultaneously measuring appliance both.But in order to increase the degree of accuracy of test, the utility model is preferably by electronic current mutual inductor 108 to be measured and electronic type voltage transformer 109 independent measurements respectively to be measured.
Preferably, for the test of electronic current mutual inductor, on a wire, be also connected with load capacitance 113 for simulating the load capacitance of actual motion circuit.For the test of electronic type voltage transformer, for the product of inductance principle, on a wire, be also connected with load capacitance 113 for simulating the load capacitance of actual motion circuit.
Preferably, the output current 2A of HT testing transformer 101; AIS formula disconnector 103 is joined electric operating mechanism, alternating current 220V operating power.
Preferably, merge cells 111 riding positions of electric mutual inductor to be measured are apart from AIS formula disconnector 103 horizontal level 5m-10m.
According to disconnector relevant criterion content, in test, deciliter the little current values of capacitive be 0.1-0.8A (stable state), concrete numerical value is in Table 1.Actual loading electric capacity does not need accurately consistent with result of calculation, can exist according to physical condition ± 10% deviation.
Table 1 test capacitance current
| Rated voltage/kV | 72.5 | 126 | 252 | 363 | 550 | 800 |
| Electric current/A | 0.1 | 0.1 | 0.25 | 0.5 | 0.5 | 0.8 |
In test due to the reason of high-tension transformer 101 internal resistances, under combined floodgate and separating brake two states, its steady state voltage changes, by its power source change of requirement of GB1985-2004 < < high-voltage alternating current isolating switch and grounding switch > > should≤± 10%.
In test, high-tension transformer 101 output test voltage magnitudes are identical with tested electric mutual inductor rated operational voltage; Tested electric mutual inductor once part, secondary connects and electronics merge cells carries out complete assembly connection by actual service conditions, charged and press nominal situation and move at process of the test electric mutual inductor.
Embodiment 2:
Adopt the Electro Magnetic Compatibility of the little current testing electric mutual inductor of disconnector deciliter capacitive, its ultimate principle is to produce under the condition of strong electromagnetic, the Electro Magnetic Compatibility of test electric mutual inductor, so strong electromagnetic conditional parameter is one of important parameter of test.The major parameter of the little electric current process of disconnector deciliter capacitive has: voltage, electric current, electric field, magnetic field, shell potential rise.Wherein voltage and current is topmost parameter, so measuring voltage and electric current are the committed steps of the immunity experiment of electric mutual inductor under the little current condition of disconnector deciliter capacitive.
In test, primary current is the large electric current of high frequency, and the primary voltage when disconnector folding operates is also the large voltage signal that frequency content is comparatively complicated.Therefore referring to accompanying drawing 3, the preferred primary current voltage transient measuring system 200 according to the utility model embodiment is disclosed.This electric current and voltage combination metering system 200 comprises transient current transformer 114 of standard high frequency, transient voltage mutual inductor 115 of standard high frequency and high-speed sampling transmission system
Particularly, described primary current voltage transient measuring system 200 comprises and is connected in parallel on transient current transformer of a calibration on wire 114 and a transient voltage mutual inductor 115 of calibration, high-speed collection card 116 gathers respectively the output of transient current transformer of calibration 114 and a transient voltage mutual inductor 115 of calibration, and by data transfer mode, for example opto-electronic conversion is transferred to and measures host computer 107 and carry out late time data processing.
In actual use, can pass through laser energy supply, battery, the mode of sunshine energy supply is to high-speed collection card 116 power supplies.Measure host computer and can adopt any available calculation elements such as Industrial Control Computer, notebook, PC.
Especially, the transient state electromagnetic process of isolator operation is a very complex process, there is bandwidth (50Hz～100MHz), the feature of duration long (several seconds), length to the measurement frequency band of preposition probe and measuring system, interference free performance, record data has higher requirement, in related standards, this is required with " specialty is measured ".
Therefore, referring to accompanying drawing 4, the measurement mechanism figure that calibrates a transient voltage mutual inductor 115 described in AIS formula based on principle of capacitive divider is disclosed, it comprises induction electrode 301, film 302 and shielded box 303, induction electrode 301 and film 302 are positioned at shielded box 303, and film 302 is between induction electrode 301 and shielded box 303., shielded box 303 is connected with insulation column 304, and in identical current potential, wherein film 302 can be plastic sheeting.Like this, between induction electrode 301 and shielded box, accompany film 302 described in one deck, go into an arm of voltage transformer (VT) 115, between induction electrode 301 and the earth 305, stroke forms another arm of voltage transformer (VT) 115, forms transient voltage mutual inductor 115 of described calibration of capacitive divider.
Transient voltage mutual inductor of AIS formula calibration 114 uses this lubber ring of Kenneth Rogoff, and this lubber ring of Kenneth Rogoff is enclosed within to current in wire measured place one time, and the capture card that outputs to oscillography type is measured.Shading ring of design and installation, this lubber ring of Kenneth Rogoff is carried out to electromagnetic screen, this lubber ring of Kenneth Rogoff is placed in to shading ring inside, capture card is placed in shielded box 303, form an integral body with coil shading ring, be arranged on same shielded box inside with transient voltage mutual inductor 115 of calibration, share the two paths of a capture card.
Therefore, according to the AIS electric mutual inductor test macro based on the disconnector deciliter little electric current of capacitive of the present utility model, magnitude of voltage and current value during the folding of test disconnector on a wire, thus compare with the output of test product to be measured.Like this, can build 220kV, the little current test loop of 500kV disconnector deciliter capacitive in testing laboratory, simultaneously by electric mutual inductor series connection access test loop, the little current capacity process of simulated field disconnector folding hollow wire and capacitive, produce similar on-the-spot transient state strong jamming, the electromagnetic protection performance of examination electric mutual inductor under this condition.This test platform can be used for 110KV, 220kV, the electromagnetic environment of 500kV electric pressure in power transmission and power process.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model; can not assert that embodiment of the present utility model only limits to this; for the utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; can also make some simple deduction or replace, all should be considered as belonging to the utility model and determine protection domain by submitted to claims.
Claims (5)
1. the test macro of the AIS electric mutual inductor based on the disconnector deciliter little electric current of capacitive, described test macro comprises HT testing transformer, capacitive divider, AIS formula disconnector, primary current voltage transient measuring system, electric mutual inductor to be measured, secondary converter, merge cells, failure wave-recording instrument, is characterized in that:
Described HT testing transformer; described capacitive divider; described AIS formula disconnector; described primary current voltage transient measuring system; described electric mutual inductor to be measured is connected on a wire successively; described secondary converter one end connects described electric mutual inductor to be measured; the other end connects described merge cells; the other end of described merge cells connects described fault oscillograph; described fault oscillograph is for connecting the output of described merge cells, and described merge cells riding position is apart from described AIS formula disconnector horizontal level 5m-10m;
Described electric mutual inductor to be measured is electronic current mutual inductor or electronic type voltage transformer;
On a described wire, be parallel with load capacitance, described load capacitance is for simulating the load capacitance of actual motion circuit;
Described primary current voltage transient measuring system comprise be connected in parallel on transient current transformer of a calibration on wire and calibration transient voltage mutual inductor, high-speed collection card and a measurement host computer, described high-speed collection card gathers respectively the output of transient current transformer of described calibration and a transient voltage mutual inductor of described calibration, and is transferred to described measurement host computer by data transfer mode.
2. the test macro of the AIS electric mutual inductor based on the disconnector deciliter little electric current of capacitive according to claim 1, is characterized in that:
Described AIS formula disconnector deciliter the little current values of capacitive be 0.1-0.8A.
3. the test macro of the AIS electric mutual inductor based on the disconnector deciliter little electric current of capacitive according to claim 2, is characterized in that:
Described HT testing transformer output test voltage magnitude is identical with the rated operational voltage of described electric mutual inductor to be measured.
4. the test macro of the AIS electric mutual inductor based on the disconnector deciliter little electric current of capacitive according to claim 2, is characterized in that:
The output current of described HT testing transformer is 2A; Described AIS formula disconnector is joined electric operating mechanism and alternating current 220V operating power.
5. according to the test macro of the AIS electric mutual inductor based on the disconnector deciliter little electric current of capacitive described in any one in claim 1-4, it is characterized in that:
Transient voltage mutual inductor of described calibration comprises induction electrode, film and shielded box, described induction electrode and described film are positioned at described shielded box, and described film is between described induction electrode and described shielded box, described shielded box is connected with insulation column, and in identical current potential, between described induction electrode and described shielded box, accompany film described in one deck, form an arm of a transient voltage mutual inductor of described calibration, between described induction electrode and the earth, stroke forms another arm of a transient voltage mutual inductor of described calibration, form transient voltage mutual inductor of described calibration,
Transient voltage mutual inductor of described calibration is for being enclosed within this lubber ring of Kenneth Rogoff current measurement place of a described wire, outputing to described high-speed collection card measures, utilize shading ring that this lubber ring of described Kenneth Rogoff is placed in to described shading ring inner, described high speed acquisition is placed in described shielded box, form an integral body with described shading ring, it is inner that transient voltage mutual inductor of described calibration and transient voltage mutual inductor of described calibration are arranged on same described shielded box, shares the two paths of described high-speed collection card.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320558514.XU CN203502581U (en) | 2013-09-09 | 2013-09-09 | AIS electronic transformer test system based on disconnecting switch switching-on and switching-off capacitive small current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320558514.XU CN203502581U (en) | 2013-09-09 | 2013-09-09 | AIS electronic transformer test system based on disconnecting switch switching-on and switching-off capacitive small current |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487679A (en) * | 2013-09-09 | 2014-01-01 | 国家电网公司 | AIS electronic transformer testing system and testing method thereof |
| CN106526435A (en) * | 2016-10-17 | 2017-03-22 | 国网安徽省电力公司电力科学研究院 | Voltage converter impact testing device and method for active electronic voltage transformer |
| CN106680549A (en) * | 2016-12-29 | 2017-05-17 | 国家电网公司 | GIS transient simulation electromagnetic interference source |
| CN110888098A (en) * | 2018-09-07 | 2020-03-17 | 中国电力科学研究院有限公司 | Method for testing sensitive part of electronic transformer |
-
2013
- 2013-09-09 CN CN201320558514.XU patent/CN203502581U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487679A (en) * | 2013-09-09 | 2014-01-01 | 国家电网公司 | AIS electronic transformer testing system and testing method thereof |
| CN103487679B (en) * | 2013-09-09 | 2015-08-05 | 国家电网公司 | A kind of AIS electric mutual inductor test macro and method thereof |
| CN106526435A (en) * | 2016-10-17 | 2017-03-22 | 国网安徽省电力公司电力科学研究院 | Voltage converter impact testing device and method for active electronic voltage transformer |
| CN106526435B (en) * | 2016-10-17 | 2023-04-18 | 国网安徽省电力公司电力科学研究院 | Voltage converter impact testing device and method for active electronic voltage transformer |
| CN106680549A (en) * | 2016-12-29 | 2017-05-17 | 国家电网公司 | GIS transient simulation electromagnetic interference source |
| CN110888098A (en) * | 2018-09-07 | 2020-03-17 | 中国电力科学研究院有限公司 | Method for testing sensitive part of electronic transformer |
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