CN102081136A - Method for on-site GIS (Gas-insulated metal-enclosed switchgear) partial discharge detection under impulse voltage - Google Patents

Method for on-site GIS (Gas-insulated metal-enclosed switchgear) partial discharge detection under impulse voltage Download PDF

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Publication number
CN102081136A
CN102081136A CN201010568784XA CN201010568784A CN102081136A CN 102081136 A CN102081136 A CN 102081136A CN 201010568784X A CN201010568784X A CN 201010568784XA CN 201010568784 A CN201010568784 A CN 201010568784A CN 102081136 A CN102081136 A CN 102081136A
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voltage
gis
signal
partial discharge
under
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CN201010568784XA
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董明
李彦明
任明
赵学风
孙强
王守国
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Xian Jiaotong University
Northwest China Grid Co Ltd
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Xian Jiaotong University
Northwest China Grid Co Ltd
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Abstract

The invention discloses a method for on-site GIS (Gas-insulated metal-enclosed switchgear) partial discharge detection under an impulse voltage, comprising the following steps: firstly, respectively detecting the earthing current signal of GIS equipment which is in a normal insulation state and has insulation defects under the impulse voltage by using a high-frequency current sensor; converting the earthing current signal into a voltage signal; extracting the partial discharge pulse superimposed on the voltage signal; creating a characteristic database of the partial discharge pulse under the impulse voltage; detecting the earthing current signal to be detected of the GIS equipment to be detected under the impulse voltage by using the high-frequency current sensor; converting the earthing current signal to be detected into a voltage signal; extracting the partial discharge pulse superimposed on the voltage signal; and detecting the insulation situation of the GIS equipment to be detected by comparison with the characteristic database. The detection method disclosed by the invention and an on-site impulse withstand voltage test are simultaneously carried out, so that the test does not need to be carried out alone, thereby effectively reducing the test frequency. In addition, compared with the existing partial discharge detection under a power frequency voltage, the method disclosed by the invention causes less insulation damage to the detected GIS equipment, thereby ensuring the safety of the GIS equipment.

Description

A kind ofly be applicable to GIS detection method for local discharge under the on-the-spot surge voltage
Technical field
The invention belongs to the big current detection technology of high frequency field, relate to a kind of GIS detection method for local discharge, especially a kind of displacement current that produces under surge voltage by capicitive sample (GIS) detects the method for finding the inner shelf depreciation of test product, is applicable to the on-the-spot Partial Discharge Detection of UHV (ultra-high voltage) GIS equipment.
Background technology
(Gas-insulated metal-enclosed switchgear is one of most important equipment in the present electric system GIS) to gas-insulating and fully-enclosed formula combined electrical apparatus, and its operational reliability is directly connected to the safety and stability of network system.Usually after GIS (gas insulated combined electrical equipment) makes in factory, tests, be that the mode with delivery unit transports mounting site to.Equipment in transportation, store and install in contingent problem have parts to become flexible, come off, electrode surface scratch or the electrode surface defective that dislocation causes is installed, electrically conductive particles enters or instrument is forgotten in device etc.Above-mentioned unexpected factor all can cause insulation fault, and relevant statistics shows have 2/3 to occur on the equipment that did not carry out on-the-spot withstand voltage test in the insulation fault of GIS approximately.The purpose of on-the-spot withstand voltage test is to check whether the insulating property of overall assembling are intact, so GIS must carry out on-the-spot withstand voltage test after assembling at the scene.
In recent years, measurement of partial discharge has become the important means of GIS insulating monitoring.GIS measures shelf depreciation when making on-the-spot AC voltage withstand test, to finding that the insulation defect of equipment has been brought into play vital role after the on-the-spot installation, national standard and power industry standard have all provided concrete regulation to site test and the detection method for local discharge of GIS, we can say GIS is carried out the method for industrial frequency withstand voltage and measurement of partial discharge and the stage that technology has reached comparative maturity.Yet,, can not meet the demands for the power frequency withstand test of voltage levels equipment and the equivalence of impulse voltage withstand test along with improving constantly of equipment electric pressure.Discover that the hidden danger in the SF6 gas is for its sensitivity difference of different voltage waveforms.Power frequency withstand test is quite sensitive to the insulation breakdown that inspection medium pollution, SF6 moisturized gas etc. cause, but for the metal surface cut is arranged, and the conductive surface state is bad to wait sensitivity not high, and hidden danger is difficult for finding.And under impulse voltage withstand test since severe non-uniform electric field when puncturing corona stabilization turn into poor, therefore, impulse test is very effective to checking that fixing metal particulate, part are retained in situations such as GIS device interior, radome installation be improper.Though therefore GIS equipment was done AC voltage withstand test and also was not enough to find all hidden danger.In addition, for some defective, the characteristics of its continuation also can make defective further enlarge simultaneously though power-frequency voltage can excite, expose defective, thereby cause bigger damage to equipment.Surge voltage is because the one property crossed when exciting, exposing defective, can't enlarge defective.Therefore according to relevant rules regulation, particularly operating impulse voltage test and to carry out the detection of shelf depreciation under the surge voltage simultaneously so that more effectively find defective on the basis of this project research be exactly a problem that presses for solution of surge voltage is carried out in commissioning test at the GIS device context.Another advantage of the proposition of this method be IEC60060-3 to power equipment do the employed lightning impulse of on-the-spot impulse voltage withstand test, the switching impulse waveform has been done clearly regulation, the waveform of recommending has that to produce efficient high thereby be fit to the on-the-spot advantage that has with the consistance of laboratory respective waveforms again thereby be convenient to the result is compared of using, and this also is the proposition and the major criterion basis of implementing later on of this method.Based on more than, when carrying out the on-the-spot impulse voltage test of GIS, carry out measurement of partial discharge for the inner hidden danger of timely discovery, guarantee that equipment safety operation has important and practical meanings.Therefore, the measurement of partial discharge technology has important engineering application value under the surge voltage.
In order not influence the loop parameter of the on-the-spot impulse voltage test of GIS, this method proposes to adopt a kind of non-electric-connecting mode, and the displacement current from the ground wire of test loop is obtained local discharge signal.
In addition, utilize said method that the measurement of shelf depreciation is in the qualitative stage at present, to the order of severity of GIS inherent vice, the partial discharge quantity under the surge voltage and the identification of defect type is unascertainable provides.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of GIS detection method for local discharge under the on-the-spot surge voltage that is applicable to is provided, this method can effectively detect the insulation status of UHV (ultra-high voltage) GIS equipment, puts the limitation of measuring method for following innings with the compensation power frequency.
The objective of the invention is to solve by the following technical programs:
Thisly be applicable to GIS detection method for local discharge under the on-the-spot surge voltage, it is characterized in that, may further comprise the steps:
1) at first adopt High Frequency Current Sensor to detect the ground current signal of GIS equipment under surge voltage that state of insulation is normal and have insulation defect respectively, with the ground current conversion of signals is voltage signal, extract the partial discharge pulse that superposes on the voltage signal, set up partial discharge pulse's property data base under the surge voltage;
2) adopt High Frequency Current Sensor to detect the to be measured ground current signal of GIS equipment to be measured under surge voltage again, with ground current conversion of signals to be measured is voltage signal, extract the partial discharge pulse that superposes on the voltage signal, by contrasting the insulation status that detects GIS equipment to be measured with property data base.
Above-mentioned steps 1) in, exist the GIS equipment of insulation defect to be meant: all insulation defect types that occur and count on during GIS equipment is used, be arranged in the normal GIS equipment of state of insulation, thereby prepare the multiple GIS device model that has the different insulative defect type.
Above-mentioned steps 1) in, the partial discharge pulse's method that superposes on the extraction displacement current signal is: the ground current signal is carried out Filtering Processing by digital high-pass filter, and filtering capacitive displacement current signal obtains partial discharge pulse's signal.
Step 2) in, adopts non-electric-connecting Luo-coil current sensor, carry out Partial Discharge Detection simultaneously with on-the-spot impulse voltage withstand test.
Step 2) in GIS equipment delivery test or on-the-spot installation test, carries out.
The above High Frequency Current Sensor adopts the Luo-coil current sensor, described Luo-coil current sensor is set on the GIS equipment ground line to be measured in surge voltage withstand voltage test loop, the ground current signal is converted into voltage signal, and uses concentric cable voltage signal to be transferred to the signal processing system of back level.
Above-mentioned Luo-coil current sensor adopts the Ni-Zn magnetic core of 100,000,000 level work frequencies and high initial magnetoconductivity.
The present invention has following beneficial effect:
1) detection method of the present invention is carried out simultaneously with the impulse voltage withstand test at scene, needn't test separately, has effectively reduced test number (TN);
2) the present invention adopts non-electric-connecting mode to obtain the ground connection displacement current signal that surge voltage produces on the GIS test product, does not change the loop parameter of original impulse voltage withstand test, has greatly improved test efficiency;
3) that the insulation harm of tested GIS equipment is compared under the existing power-frequency voltage Partial Discharge Detection is little in the present invention, has guaranteed the safety of GIS equipment;
4) The present invention be directed to equipment at UHV (ultra-high voltage) GIS, the particularly insulation status of the GIS equipment of the above electric pressure of 750kV diagnosis, the defective that can not effectively find down power-frequency voltage has quite good detecting effectiveness, remedied the limitation of power frequency detection method for local discharge, significant to the security and the reliability that improve Operation of Electric Systems.
Description of drawings
The standard surge voltage waveform (part) of Fig. 1 for using among the present invention, wherein (a) is 20/100 μ s standard lightning wave; (b) be 20/100 μ s, the 16kHz thunder and lightning wave of oscillation; (c) be 400/4000 μ s standard operation ripple; (d) be the 400/4000 μ s operation wave of oscillation.
High frequency sensors project organization and the equivalent electrical circuit of Fig. 2 for using among the present invention, wherein (a) is current sensor structural principle synoptic diagram; (b) be the current sensor equivalent electrical circuit.
Fig. 3 is the amplitude versus frequency characte of current sensor of the present invention, R=50 Ω in (a) wherein, A:N=12, B:N=20, C:N=28; (b) N=20 in, A:R=100 Ω, B:R=50 Ω, C:R=10 Ω.
Fig. 4 is the dynamic perfromance of current sensor, and wherein (a) is that square wave is corresponding; (b) measure for high-frequency impulse.
Fig. 5 adopts the loop structure block diagram of this method to its test for being example with a 800kV GIS.
Fig. 6 is a legend as a result of extracting shelf depreciation from the displacement current signal, wherein (a) displacement current of recording for current sensor; (b) be signal after digital processing.
Embodiment
Of the present inventionly be applicable to GIS detection method for local discharge under the on-the-spot surge voltage, specifically may further comprise the steps:
1) at first adopt High Frequency Current Sensor to detect the ground current signal of GIS equipment under surge voltage that state of insulation is normal and have insulation defect respectively, with the ground current conversion of signals is voltage signal, extract the partial discharge pulse that superposes on the voltage signal, set up partial discharge pulse's property data base under the surge voltage.The described GIS equipment of insulation defect that exists is meant: all insulation defect types that occur and count on during GIS equipment is used are arranged in the normal GIS equipment of state of insulation, thereby prepare the multiple GIS device model that has the different insulative defect type.Extracting the partial discharge pulse's method that superposes on the displacement current signal is: the ground current signal is carried out Filtering Processing by digital high-pass filter, and filtering capacitive displacement current signal obtains partial discharge pulse's signal.
2) adopt High Frequency Current Sensor to detect the to be measured ground current signal of GIS equipment to be measured under surge voltage again, with ground current conversion of signals to be measured is voltage signal, extract the partial discharge pulse that superposes on the voltage signal, by contrasting the insulation status that detects GIS equipment to be measured with property data base.
In the preferred embodiment of the present invention, can adopt non-electric-connecting Luo-coil current sensor, carry out Partial Discharge Detection simultaneously with on-the-spot impulse voltage withstand test, the Luo-coil current sensor adopts the Ni-Zn magnetic core of 100,000,000 level work frequencies and high initial magnetoconductivity.The present invention can carry out in GIS equipment delivery test or on-the-spot installation test in addition.
When above High Frequency Current Sensor adopts the Luo-coil current sensor, the Luo-coil current sensor is set on the GIS equipment ground line to be measured in surge voltage withstand voltage test loop, the ground current signal is converted into voltage signal, and uses concentric cable voltage signal to be transferred to the signal processing system of back level.
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 1, this figure be depicted as stipulate in the IEC60060-3 standard power equipment is done the employed lightning impulse of on-the-spot impulse voltage withstand test, switching impulse waveform, the waveform of recommendation has and produces the efficient height, is fit to on-the-spot the use.
What high frequency sensors adopted is the faradic principle of this lubber ring of Kenneth Rogoff, and concrete design is as follows:
The current sensor structural principle is shown in Fig. 2 (a), and i (t) is the tested Ampereconductors of primary side, and e (t) is the sensor sensing output voltage, sensor by and tested Ampereconductors between mutual inductance realize isolation measurement with high tension loop.Among the figure, a, b and h are respectively the inside and outside footpath and the height of secondary side magnetic core.
Get induced voltage by Fig. 2 (a):
e ( t ) = - M di ( t ) dt - - - ( 1 )
In the formula, M is the sensor coefficient of mutual inductance.In order directly to obtain and the proportional signal of i (t) the external integrating resistor of sensor need.Equivalent electrical circuit as shown in Figure 6, R among the figure 0And L 0Be sensor equivalent internal resistance and self-induction, R is external integrating resistor, and u (t) is an output voltage.Because i (t) equivalent frequency is very high, so the stray capacitance C at R two ends 0Can not ignore.
It is as follows to list equation according to Fig. 2 (b):
e ( t ) = L 0 C 0 d 2 u ( t ) dt 2 + ( L 0 R + R 0 C 0 ) d 2 u ( t ) dt 2 + ( 1 + R 0 C 0 ) u ( t ) - - - ( 2 )
Formula (1) and (2) are carried out Laplace transformation, get sensor transfer function:
H ( s ) = u ( s ) I ( s ) = Ms L 0 C 0 s 2 + ( L 0 R + R 0 C 0 ) s + R 0 + R R - - - ( 3 )
By three dB bandwidth, calculate the upper and lower limit cutoff frequency:
f H = L 0 + RR 0 C 0 2 π RL 0 C 0 ≈ 1 2 π RC 0 - - - ( 4 )
f L = R 0 + R 2 π L 0 ≈ R 2 π L 0 - - - ( 5 )
The working band of core material has determined the sensor frequency band to a certain extent.More domestic scholar's research have compared the frequency response characteristic of different high frequency magnetic cores, the result shows, nickel-zinc ferrite (Ni-Zn) response band is wide and high frequency characteristics stable, therefore, selects the magnetic core of a nickel zinc magnet ring as designed High Frequency Current Sensor in the design.The inside and outside footpath of magnet ring is respectively 26mm, 45mm, highly is 15mm, initial permeability μ iBe 10, working band is 1-150MHz.Because the shelf depreciation electric current of surveying is a microampere order to milliampere (mA) grade little electric current, so need not to consider the magnetic core saturation problem when designing.
Number of turn N and integrating resistor R are the key factors that influences the sensor frequency characteristic.The sensor amplitude versus frequency characte that Fig. 3 for a change records when N and R.As shown in Figure 3, (1) fixedly R=50 Ω is constant, and along with the increase of N, the gain of sensor passband is that sensitivity reduces, and low-frequency cut-off frequency reduces; (2) fix N=20 circles are constant, and when R increased, sensitivity increased, and the high-frequency cut-off frequency reduces, and passband narrows down, and when R increases to certain value, does not match with the sensor direct impedance, can cause measured waveform serious vibration to occur.
Take all factors into consideration system stability and higher sensitivity and good high frequency characteristics, select N=20, R=50 Ω, measuring the sensor bandwidth is 800kHz-102MHz, sensitivity reaches 2.4V/A.In actual design process, stray capacitance is to the influence of high frequency characteristics over the ground to consider the signal-transmitting cable that links to each other with sensor, and terminal is selected 50 Ω build-out resistors.
Fig. 4 is the dynamic perfromance of this sensor, and wherein passage 1 is the generator output voltage signal, and passage 2 is the sensor output voltage signal.
By Fig. 4 (a) as seen, sensor is that the response time of the square-wave signal of 2.13ns is 3.43ns to fall time, and according to formula (4), getting equivalent upper limiting frequency is 102MHz, with actual frequency characteristic basically identical; Be input as high-frequency pulse signal among Fig. 4 (b), the sensor response rise time is 3.48ns, and for ns level partial discharge pulse signal, this High Frequency Current Sensor satisfies measurement requirement.
f upper = 350 t rise MHz - - - ( 6 )
Figure 5 shows that the test loop of a 800kV GIS equipment being carried out measurement of partial discharge under the surge voltage, wherein current sensor is set on the ground wire in loop, with the cable that adds matched impedance signal is transferred to and carries out signal Processing at a distance.Utilize the resulting displacement current waveform example of described method to see Fig. 6.
Below listed the content that is applicable to detection method for local discharge under the on-the-spot surge voltage in detail, comprise the surge voltage waveform, measurement opportunity, the obtain manner of local discharge signal, the test loop, and the specific design of High Frequency Current Sensor, determined its component parameters and manufacturing materials by analysis and simulation to displacement current, its amplitude versus frequency characte and dynamic response all reach designing requirement.By a 800kV GIS is detected, its result is comparatively desirable, can effectively find the insulation defect that GIS is potential in addition.

Claims (7)

1. one kind is applicable to GIS detection method for local discharge under the on-the-spot surge voltage, it is characterized in that, may further comprise the steps:
1) at first adopt High Frequency Current Sensor to detect the ground current signal of GIS equipment under surge voltage that state of insulation is normal and have insulation defect respectively, with the ground current conversion of signals is voltage signal, extract the partial discharge pulse that superposes on the voltage signal, set up partial discharge pulse's property data base under the surge voltage;
2) adopt High Frequency Current Sensor to detect the to be measured ground current signal of GIS equipment to be measured under surge voltage again, with ground current conversion of signals to be measured is voltage signal, extract the partial discharge pulse that superposes on the voltage signal, by contrasting the insulation status that detects GIS equipment to be measured with property data base.
2. according to claim 1ly be applicable to GIS detection method for local discharge under the on-the-spot surge voltage, it is characterized in that, in the step 1), exist the GIS equipment of insulation defect to be meant: all insulation defect types that occur and count on during GIS equipment is used, be arranged in the normal GIS equipment of state of insulation, thereby prepare the multiple GIS device model that has the different insulative defect type.
3. according to claim 1ly be applicable to GIS detection method for local discharge under the on-the-spot surge voltage, it is characterized in that, in the step 1), extracting the partial discharge pulse's method that superposes on the displacement current signal is: the ground current signal is carried out Filtering Processing by digital high-pass filter, filtering capacitive displacement current signal obtains partial discharge pulse's signal.
4. according to claim 1ly be applicable to GIS detection method for local discharge under the on-the-spot surge voltage, it is characterized in that: step 2) in, adopt non-electric-connecting Luo-coil current sensor, carry out Partial Discharge Detection simultaneously with on-the-spot impulse voltage withstand test.
5. according to claim 1ly be applicable to GIS detection method for local discharge under the on-the-spot surge voltage, it is characterized in that: step 2) in GIS equipment delivery test or on-the-spot installation test, carry out.
6. according to claim 1ly be applicable to GIS detection method for local discharge under the on-the-spot surge voltage, it is characterized in that: described High Frequency Current Sensor adopts the Luo-coil current sensor, described Luo-coil current sensor is set on the GIS equipment ground line to be measured in surge voltage withstand voltage test loop, the ground current signal is converted into voltage signal, and uses concentric cable voltage signal to be transferred to the signal processing system of back level.
7. according to claim 6ly be applicable to GIS detection method for local discharge under the on-the-spot surge voltage, it is characterized in that: described Luo-coil current sensor adopts the Ni-Zn magnetic core of 100,000,000 level work frequencies and high initial magnetoconductivity.
CN201010568784XA 2010-12-01 2010-12-01 Method for on-site GIS (Gas-insulated metal-enclosed switchgear) partial discharge detection under impulse voltage Pending CN102081136A (en)

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CN102368089A (en) * 2011-11-17 2012-03-07 江苏省电力公司南京供电公司 Test method of carrying out partial discharge measurement based on high-voltage cable voltage withstand test
CN103558521A (en) * 2013-11-02 2014-02-05 国家电网公司 Device for detecting partial discharge of transformer under surge voltage
CN103558522A (en) * 2013-11-02 2014-02-05 国家电网公司 Method for detecting partial discharge of transformer under surge voltage
CN103698675A (en) * 2014-01-07 2014-04-02 西安交通大学 Method and system for analyzing local discharging under oscillating-type impulse voltage
CN103744006A (en) * 2014-01-07 2014-04-23 海南金海浆纸业有限公司 Localization diagnosis method for partial discharge generated by looseness in high-voltage electrical equipment
CN104375110A (en) * 2014-11-03 2015-02-25 深圳供电局有限公司 Earth electric wave sensor performance test system
CN104459497A (en) * 2014-12-18 2015-03-25 西安交通大学 Device for measuring and analyzing partial discharge under surge voltage
CN104459494A (en) * 2014-12-17 2015-03-25 西安交通大学 Partial discharge measurement device for GIS device under site impulse voltage
CN106932697A (en) * 2017-04-19 2017-07-07 天津市电力科技发展有限公司 GIS equipment partial discharge detection means under oscillation mode surge voltage
CN108614198A (en) * 2018-04-20 2018-10-02 广州供电局有限公司 High-tension cable pressure test distribution partial discharge detecting system and its detection method
CN109471008A (en) * 2018-12-20 2019-03-15 杭州西湖电子研究所 A method of reactor insulation status is detected by oscillation wave
CN112924827A (en) * 2021-01-29 2021-06-08 国网电力科学研究院武汉南瑞有限责任公司 GIS defect diagnosis device and method based on sweep frequency current method

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CN102368089A (en) * 2011-11-17 2012-03-07 江苏省电力公司南京供电公司 Test method of carrying out partial discharge measurement based on high-voltage cable voltage withstand test
CN103558522A (en) * 2013-11-02 2014-02-05 国家电网公司 Method for detecting partial discharge of transformer under surge voltage
CN103558521A (en) * 2013-11-02 2014-02-05 国家电网公司 Device for detecting partial discharge of transformer under surge voltage
CN103698675A (en) * 2014-01-07 2014-04-02 西安交通大学 Method and system for analyzing local discharging under oscillating-type impulse voltage
CN103744006A (en) * 2014-01-07 2014-04-23 海南金海浆纸业有限公司 Localization diagnosis method for partial discharge generated by looseness in high-voltage electrical equipment
CN103744006B (en) * 2014-01-07 2016-03-23 海南金海浆纸业有限公司 High voltage electric equipment inside loosens the shelf depreciation positioning diagnosticing method produced
CN104375110B (en) * 2014-11-03 2017-11-07 深圳供电局有限公司 A kind of ground radio wave sensor Performance Test System
CN104375110A (en) * 2014-11-03 2015-02-25 深圳供电局有限公司 Earth electric wave sensor performance test system
CN104459494B (en) * 2014-12-17 2017-08-08 西安交通大学 A kind of GIS device partial discharge measurement device under impulse voltage on site
CN104459494A (en) * 2014-12-17 2015-03-25 西安交通大学 Partial discharge measurement device for GIS device under site impulse voltage
CN104459497A (en) * 2014-12-18 2015-03-25 西安交通大学 Device for measuring and analyzing partial discharge under surge voltage
CN106932697A (en) * 2017-04-19 2017-07-07 天津市电力科技发展有限公司 GIS equipment partial discharge detection means under oscillation mode surge voltage
CN108614198A (en) * 2018-04-20 2018-10-02 广州供电局有限公司 High-tension cable pressure test distribution partial discharge detecting system and its detection method
CN109471008A (en) * 2018-12-20 2019-03-15 杭州西湖电子研究所 A method of reactor insulation status is detected by oscillation wave
CN112924827A (en) * 2021-01-29 2021-06-08 国网电力科学研究院武汉南瑞有限责任公司 GIS defect diagnosis device and method based on sweep frequency current method

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