CN103913681A - System and method for detecting partial discharge under high-frequency voltage - Google Patents

System and method for detecting partial discharge under high-frequency voltage Download PDF

Info

Publication number
CN103913681A
CN103913681A CN201410112062.1A CN201410112062A CN103913681A CN 103913681 A CN103913681 A CN 103913681A CN 201410112062 A CN201410112062 A CN 201410112062A CN 103913681 A CN103913681 A CN 103913681A
Authority
CN
China
Prior art keywords
high frequency
current sensor
frequency current
voltage
partial discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410112062.1A
Other languages
Chinese (zh)
Inventor
庞月龙
鲁旭
李庆民
韩帅
刘伟杰
王高勇
魏晓光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China-EPRI Electric Power Engineering Co., Ltd.
State Grid Smart Grid Institute
State Grid Corp of China SGCC
Shandong Electric Power Research Institute
North China Electric Power University
Original Assignee
North China Electric Power University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North China Electric Power University filed Critical North China Electric Power University
Priority to CN201410112062.1A priority Critical patent/CN103913681A/en
Publication of CN103913681A publication Critical patent/CN103913681A/en
Pending legal-status Critical Current

Links

Abstract

The invention discloses a system and method for detecting partial discharge under a high-frequency voltage and belongs to the technical field of partial discharge detection. The system comprises a high-frequency voltage test source, a high-voltage coupling capacitor, a first high-frequency current sensor, a first high-frequency current sensor, high-frequency coaxial cables and a signal collecting and processing unit. The high-frequency voltage test source is respectively connected with the high-voltage coupling capacitor and a tested product. A grounded circuit of the high-voltage coupling capacitor is sleeved with the first high-frequency current sensor. A grounded circuit of the tested product is sleeved with the second high-frequency current sensor. The signal collecting and processing unit is respectively connected with the first high-frequency current sensor and the second high-frequency current sensor through the high-frequency coaxial cables. According to the method for detecting partial discharge, the difference method that equivalent coupling capacitors are connected in parallel is used for indirectly measuring and obtaining partial discharge signals, high-frequency interference such as noise and power sources in the partial discharging signals is effectively removed, and the method is simple in wiring and conducts operation and measurement conveniently.

Description

Partial discharge detecting system and method under a kind of HF voltage
Technical field
The invention belongs to the detection technique field of shelf depreciation, relate in particular to partial discharge detecting system and method under a kind of HF voltage.
Background technology
Along with development and the application of Power Electronic Technique, variable-frequency motor, high-frequency power electronic transformer, high frequency electrical equipments such as Anode saturable reactor for valve are widely applied and pay close attention in the construction and development of intelligent grid.Different from the electrical equipment of conventional power frequency 50Hz operating condition, it bears high voltagehigh frequency or pulse voltage stress while normally operation.Relevant operating experience and research show, the precipitous voltage build-up rate that HF voltage is brought is deteriorated with the aggravation of reversal of poles meeting fast insulating material, cause above-mentioned high frequency electrical equipment turn-to-turn insulation premature failure generally to occur, this certainly will propose more stern challenge to the insulation optimization design of electrical equipment, has a strong impact on the safe operation of electric system.
The detection of shelf depreciation is the important means of examination insulation of electrical installation performance and ageing state assessment.Because shelf depreciation is a complicated physical phenomenon, follow these many electricity (as electric pulse, dielectric loss etc.) and non-electricity (as light, heat, ultrasound wave, new reaction thing etc.) phenomenon.Also corresponding non-electrical measurement methods such as electro-detection method and flash spotting, sound detection, infrared thermal method that occurred in Partial Discharge Detecting Technology.Because non-electrical measuring method is than electrical measuring method, sensitivity is not high, poor anti jamming capability and the important parameter such as be difficult to play a game high-volume carry out quantitative test, makes comparatively limitation of non-electrical measuring method application.And electrical measuring method is direct owing to measuring, highly sensitive, good resolution is occupied an leading position in laboratory off-line test and on-line monitoring.
At present, the conventional main experimental provision of shelf depreciation electrical measuring method comprises coupling condenser, detects impedance, prime amplifier, shelf depreciation instrument etc.Its ultimate principle is: while producing a shelf depreciation, test product Cx two ends, along with producing an instantaneous change in voltage U, are now coupled to and are detected in impedance through coupling condenser, obtain pulse current of PD signal in loop.But there is many disadvantages in conventional partial discharge detecting system under HF voltage: 1) the detection impedance of the RLC in measuring circuit and stray capacitance, stray inductance etc., can make to measure the parameters such as frequency band to drift about, and have a strong impact on measurement result accuracy; 2) pick-up unit is generally applicable to the low frequency signal below 1MHz, and high frequency performance is poor.If be applied to the detection of local discharge signal under HF voltage, its effective local discharge signal is all seriously flooded by source pulse signal; 3) undesired signal frequency is more abundant complicated.Interference source comprises voltage source interference, the interference of environment electromagnetics signal, noise jamming etc., this will with ranging pulse signal mix assorted together with, be difficult to extract and distinguish.Therefore, there is significant limitation in conventional current method, in the urgent need to pick-up unit and the method for shelf depreciation under a kind of HF voltage in the time measuring under HF voltage Partial discharge signal.
Summary of the invention
For the conventional partial discharge detecting system of mentioning in background technology under HF voltage, Partial discharge signal is flooded, causes ranging pulse signal to be difficult to extract differentiation by source pulse signal, cause the problem that measurement accuracy is low, the present invention proposes partial discharge detecting system and method under a kind of HF voltage.
Partial discharge detecting system under a kind of HF voltage, it is characterized in that, described system comprises HF voltage test pill, high-tension coupling condenser, the first High Frequency Current Sensor, the second High Frequency Current Sensor, coaxial cable for high frequency and signals collecting and processing unit;
Wherein, described HF voltage test pill is connected with high-tension coupling condenser and product to be tested respectively;
Described the first High Frequency Current Sensor is enclosed within on the ground loop of high-tension coupling condenser;
Described the second High Frequency Current Sensor is enclosed within on the ground loop of product to be tested;
Described signals collecting is connected with the first High Frequency Current Sensor and the second High Frequency Current Sensor respectively by coaxial cable for high frequency with processing unit.
It is 1-50kHz and adjustable continuously that described HF voltage test pill adopts voltage waveform frequency, and its amplitude is 0-30kV and continuously adjustable HF voltage test pill.
Described the first High Frequency Current Sensor and the second High Frequency Current Sensor adopt the High Frequency Current Sensor of same model; Described High Frequency Current Sensor adopts the High Frequency Current Sensor of the low-power consumption open loop core-theaded type current sensor/Luo-coil of Hall effect.
Described system also comprises two metal shielding boxes; Be respectively used to place the first High Frequency Current Sensor and the second High Frequency Current Sensor.
Described high-tension coupling condenser adopts ceramic-type capacitor.
It is 50 ohm that described coaxial cable for high frequency adopts characteristic impedance, the concentric cable that frequency range is 0-3GHz; Described coaxial cable for high frequency adopts silver-plated double layer screen.
A local discharge signal extracting method that adopts partial discharge detecting system under described HF voltage, comprises the following steps:
Step 1: before experiment, use broadband impedance tester to measure the capacitance of product to be tested, and the selection high-tension coupling condenser identical with product to be tested capacitance;
Step 2: partial discharge detecting system under HF voltage is carried out to initialization demarcation;
Step 3: product to be tested is accessed to partial discharge detecting system under HF voltage, measure respectively the first High Frequency Current Sensor and the second High Frequency Current Sensor and measure the two-way pulsed current signal on ground wire;
Step 4: the two-way pulsed current signal that step 3 is obtained connects signals collecting and processing unit by coaxial cable for high frequency, carries out local discharge signal data collection and analysis, thus the Partial Discharge Detection information under HF voltage obtained.
The described process that partial discharge detecting system under HF voltage is carried out to initialization demarcation is:
Step 201: choose a capacitor equating with high-tension coupling condenser capacitance, replace under product to be tested access HF voltage in partial discharge detecting system;
Step 202: partial discharge detecting system under HF voltage is carried out to precharge, measure respectively the first High Frequency Current Sensor and the second High Frequency Current Sensor and measure the two-way pulsed current signal on ground wire;
Step 203: the mode by differential amplification is carried out filtering processing to two loop pulsed current signals;
Step 204: judge whether difference output is less than or equal to 5mv; If so, perform step 3; Otherwise replacing waits the high-tension coupling condenser of capacitance, repeated execution of steps 201~step 204 again.
Described local discharge signal data analysis and processing, comprise the following steps:
Step 401: two-way pulsed current signal is done to calculus of differences, obtain original local discharge signal;
Step 402: utilize wavelet packet to carry out wavelet filtering to original discharge signal, disturb and Gaussian noise in elimination test source, local discharge signal after acquisition filtering.
Partial Discharge Detection information under described HF voltage comprises shelf depreciation discharge time, discharge phase and electric discharge amplitude.
It is good that the given partial discharge detecting system of the present invention has test pill low-frequency disturbance and white noise inhibition, and signal to noise ratio (S/N ratio) is high, and simple in structure, the feature of easy-to-connect; Partial Discharge Detection field under HF voltage, the difference method of the detection method for local discharge utilization equivalent coupling capacitance in parallel providing is measured acquisition local discharge signal indirectly, effectively remove the high frequency interference such as noise, power supply in local discharge signal, this method wiring is simultaneously simple, is convenient to practical operation and measures.
Accompanying drawing explanation
Fig. 1 is the measuring circuit schematic diagram of partial-discharge measuring device under HF voltage of the present invention;
Fig. 2 is the impedance operator of a routine product to be tested and coupling capacitance in the present invention;
Fig. 3 two detects current signal and differential effect figure in loops in the present invention;
Fig. 4 is the optimal wavelet base schematic diagram of choosing in the present invention; Wherein, (a) be father's small echo; (b) be female small echo.
Fig. 5 is wavelet transformation processing procedure schematic diagram in the present invention; Wherein, in figure, (a) is original signal; (b) be signal after passing threshold filtering; (c) be signal after polarity discriminating; (d) window and differentiate rear signal;
Wherein, 1-HF voltage test pill; 2-is high-tension coupling condenser; 3-the first High Frequency Current Sensor; 4-the second High Frequency Current Sensor; 5-coaxial cable for high frequency; 6-signals collecting and processing unit; 7-product to be tested.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation is only exemplary, rather than in order to limit the scope of the invention and to apply.
Fig. 1 is the measuring circuit schematic diagram of partial-discharge measuring device under HF voltage of the present invention.In Fig. 1, described system comprises HF voltage test pill, high-tension coupling condenser, the first High Frequency Current Sensor, the second High Frequency Current Sensor, coaxial cable for high frequency and signals collecting and processing unit;
Wherein, described HF voltage test pill is connected with high-tension coupling condenser and product to be tested respectively; Described the first High Frequency Current Sensor is enclosed within on the ground loop of high-tension coupling condenser; Described the second High Frequency Current Sensor is enclosed within on the ground loop of product to be tested; Described signals collecting is connected with the first High Frequency Current Sensor and the second High Frequency Current Sensor respectively by coaxial cable for high frequency with processing unit.
In the pick-up unit of the present embodiment, High Frequency Current Sensor based on Luo-coil is ETS-93686 potline current sensor, Measurement bandwidth is 300kHz-100MHz, meet the corresponding requirement of high-frequency impulse frequency band, simultaneously the effectively interference of inhibition test source to Partial discharge signal of its higher lower frequency limit.Disturb for reducing, except environmental factor (as dust, electromagnetic interference (EMI) etc.), high frequency sensors is installed in metal shielding box side by side.
By between product to be tested access in parallel with high-tension coupling condenser high-pressure side and ground wire, two ETS-93686 High Frequency Current Sensor are installed in respectively on the ground wire in two loops, measure the pulsed current signal on ground wire, connect High Frequency Current Sensor and oscillograph DLM6054 by coaxial cable for high frequency.
High-tension coupling condenser is selected the ceramic capacitor of withstand voltage 50kV, and it is identical with product to be tested or approaching to choose its capacitance.
The signal that High Frequency Current Sensor is measured is sent into oscillograph collection, and the oscillograph adopting is Yokogawa DLM6054 oscillograph, measure analog bandwidth 1.5GHz, and maximum sample frequency is 4GS/s.
Concrete enforcement comprises step:
1) product to be tested is selected thickness 1mm, the epoxy resins insulation plate of diameter 10mm; Use wideband electric impedance analyzer Agilent4294A to measure test product epoxy resin thin plate and high-tension coupling condenser impedance operator; Its Measurement and analysis result as shown in Figure 2;
2) before experiment, for selecting two High Frequency Current Sensor that signal response is consistent, and then the difference of eliminating current sensor.First, by two equivalent capacitance access measuring circuits, select two High Frequency Current Sensor to access respectively two loops.To system precharge, detect road signal to collect two and do difference processing, if obviously test pill interference waveform of nothing in difference result waveform, two detection loop initialization process meet the demands substantially so, otherwise the high-tension coupling condenser that the capacitance such as should change, then repeats this step;
3) start shelf depreciation experiment, measure and gather two translocation loop pulsed current signals, and save the data in the portable computer in signals collecting and processing unit with TXT form;
4) signal in two detection loops is done to calculus of differences, obtain original local discharge signal;
5) adopt self-built wavelet basis (as shown in Figure 3) utilize WAVELET PACKET DECOMPOSITION method to original discharge signal multilayer decompose, threshold values filtering, reconstruct, disturb and Gaussian noise in elimination test source, obtains signal after threshold filter, as shown in Figure 4;
6) to 3) in signal carry out polarity discriminating and processings (as shown in Figure 5) of windowing, extract effective local discharge signal, utilize the local discharge characteristic amount such as method acquisition discharge time, discharge phase of mathematical statistics.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (10)

1. partial discharge detecting system under a HF voltage, it is characterized in that, described system comprises HF voltage test pill, high-tension coupling condenser, the first High Frequency Current Sensor, the second High Frequency Current Sensor, coaxial cable for high frequency and signals collecting and processing unit;
Wherein, described HF voltage test pill is connected with high-tension coupling condenser and product to be tested respectively;
Described the first High Frequency Current Sensor is enclosed within on the ground loop of high-tension coupling condenser;
Described the second High Frequency Current Sensor is enclosed within on the ground loop of product to be tested;
Described signals collecting is connected with the first High Frequency Current Sensor and the second High Frequency Current Sensor respectively by coaxial cable for high frequency with processing unit.
2. system according to claim 1, is characterized in that, it is 1-50kHz and adjustable continuously that described HF voltage test pill adopts voltage waveform frequency, and its amplitude is 0-30kV and continuously adjustable HF voltage test pill.
3. system according to claim 1, is characterized in that, described the first High Frequency Current Sensor and the second High Frequency Current Sensor adopt the High Frequency Current Sensor of same model; Described High Frequency Current Sensor adopts the High Frequency Current Sensor of the low-power consumption open loop core-theaded type current sensor/Luo-coil of Hall effect.
4. system according to claim 1, is characterized in that, described system also comprises two metal shielding boxes; Be respectively used to place the first High Frequency Current Sensor and the second High Frequency Current Sensor.
5. system according to claim 1, is characterized in that, described high-tension coupling condenser adopts ceramic-type capacitor.
6. system according to claim 1, is characterized in that, it is 50 ohm that described coaxial cable for high frequency adopts characteristic impedance, the concentric cable that frequency range is 0-3GHz; Described coaxial cable for high frequency adopts silver-plated double layer screen.
7. a local discharge signal extracting method for partial discharge detecting system under the HF voltage described in employing, comprises the following steps:
Step 1: before experiment, use broadband impedance tester to measure the capacitance of product to be tested, and the selection high-tension coupling condenser identical with product to be tested capacitance;
Step 2: partial discharge detecting system under HF voltage is carried out to initialization demarcation;
Step 3: product to be tested is accessed to partial discharge detecting system under HF voltage, measure respectively the first High Frequency Current Sensor and the second High Frequency Current Sensor and measure the two-way pulsed current signal on ground wire;
Step 4: the two-way pulsed current signal that step 3 is obtained connects signals collecting and processing unit by coaxial cable for high frequency, carries out local discharge signal data collection and analysis, thus the Partial Discharge Detection information under HF voltage obtained.
8. method according to claim 7, is characterized in that, the described process that partial discharge detecting system under HF voltage is carried out to initialization demarcation is:
Step 201: choose a capacitor equating with high-tension coupling condenser capacitance, replace under product to be tested access HF voltage in partial discharge detecting system;
Step 202: partial discharge detecting system under HF voltage is carried out to precharge, measure respectively the first High Frequency Current Sensor and the second High Frequency Current Sensor and measure the two-way pulsed current signal on ground wire;
Step 203: the mode by differential amplification is carried out filtering processing to two loop pulsed current signals;
Step 204: judge whether difference output is less than or equal to 5mv; If so, perform step 3; Otherwise replacing waits the high-tension coupling condenser of capacitance, repeated execution of steps 201~step 204 again.
9. method according to claim 7, is characterized in that, described local discharge signal data analysis and processing, comprise the following steps:
Step 401: two-way pulsed current signal is done to calculus of differences, obtain original local discharge signal;
Step 402: utilize wavelet packet to carry out wavelet filtering to original discharge signal, disturb and Gaussian noise in elimination test source, local discharge signal after acquisition filtering.
10. method according to claim 7, is characterized in that, the Partial Discharge Detection information under described HF voltage comprises shelf depreciation discharge time, discharge phase and electric discharge amplitude.
CN201410112062.1A 2014-03-24 2014-03-24 System and method for detecting partial discharge under high-frequency voltage Pending CN103913681A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410112062.1A CN103913681A (en) 2014-03-24 2014-03-24 System and method for detecting partial discharge under high-frequency voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410112062.1A CN103913681A (en) 2014-03-24 2014-03-24 System and method for detecting partial discharge under high-frequency voltage

Publications (1)

Publication Number Publication Date
CN103913681A true CN103913681A (en) 2014-07-09

Family

ID=51039514

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410112062.1A Pending CN103913681A (en) 2014-03-24 2014-03-24 System and method for detecting partial discharge under high-frequency voltage

Country Status (1)

Country Link
CN (1) CN103913681A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104166080A (en) * 2014-09-05 2014-11-26 国家电网公司 GIS device partial discharge defect simulation device used on non-power-frequency working condition
CN104297651A (en) * 2014-11-06 2015-01-21 国网上海市电力公司 Local discharge test circuit
CN104360244A (en) * 2014-11-07 2015-02-18 华北电力大学 Solid-state transformer partial discharge on-line monitoring method
CN104459499A (en) * 2014-12-27 2015-03-25 中国西电电气股份有限公司 Power capacitor partial discharge measuring device and method
CN104698355A (en) * 2015-03-20 2015-06-10 成都吉普斯能源科技有限公司 On-line diagnosing method of high-voltage cable partial discharge
CN105510777A (en) * 2015-11-28 2016-04-20 华中科技大学 Differential pulsed magnet insulation fault detection device
CN105954697A (en) * 2016-06-06 2016-09-21 华北电力大学 Wide band precision calibration method and device of pulse current sensor
CN106249185A (en) * 2016-07-07 2016-12-21 国网北京市电力公司 For demarcating the impedance matching unit of High Frequency Current Sensor, system and method
CN107462852A (en) * 2017-06-22 2017-12-12 广西电网有限责任公司电力科学研究院 A kind of scaling method of high frequency partial discharge examination instrument parameter
CN107728091A (en) * 2017-09-20 2018-02-23 国网天津市电力公司电力科学研究院 A kind of device for being used to supervise Existing during Partial Discharge Test for Transformer quality
CN104459499B (en) * 2014-12-27 2018-08-31 中国西电电气股份有限公司 A kind of device and method measuring power capacitor partial discharge
CN110927540A (en) * 2019-12-09 2020-03-27 国网上海市电力公司 C-GIS intelligent partial discharge monitoring device based on electrified display
CN111458616A (en) * 2020-05-15 2020-07-28 广东电科院能源技术有限责任公司 Device and method for improving signal-to-noise ratio of common-mode interference suppression partial discharge
CN111551833A (en) * 2020-06-12 2020-08-18 天津大学 Cable buffer layer partial discharge test system under extremely inhomogeneous electric field
CN113358988A (en) * 2021-06-08 2021-09-07 国网宁夏电力有限公司电力科学研究院 Partial discharge detection system, method, device, computer equipment and storage medium

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101930050A (en) * 2009-06-24 2010-12-29 上海市电力公司电缆输配电公司 On-line partial discharge monitoring system of ultrahigh-voltage cable
CN102057284A (en) * 2008-06-11 2011-05-11 普睿司曼股份公司 Portable partial discharge detection device
CN202512202U (en) * 2012-03-29 2012-10-31 贵阳供电局 Partial discharge position measuring device for power transformer
CN202916386U (en) * 2011-12-30 2013-05-01 上海电器科学研究所(集团)有限公司 System for carrying out partial discharge test under high-frequency transient pulse square-wave voltage
CN203054162U (en) * 2012-12-10 2013-07-10 铜仁供电局 Comprehensive tester for partial discharge of high-voltage cable
CN203204811U (en) * 2013-04-22 2013-09-18 国家电网公司 Wireless transmitting system of partial discharge signal of transformer based on pulse current method detection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102057284A (en) * 2008-06-11 2011-05-11 普睿司曼股份公司 Portable partial discharge detection device
CN101930050A (en) * 2009-06-24 2010-12-29 上海市电力公司电缆输配电公司 On-line partial discharge monitoring system of ultrahigh-voltage cable
CN202916386U (en) * 2011-12-30 2013-05-01 上海电器科学研究所(集团)有限公司 System for carrying out partial discharge test under high-frequency transient pulse square-wave voltage
CN202512202U (en) * 2012-03-29 2012-10-31 贵阳供电局 Partial discharge position measuring device for power transformer
CN203054162U (en) * 2012-12-10 2013-07-10 铜仁供电局 Comprehensive tester for partial discharge of high-voltage cable
CN203204811U (en) * 2013-04-22 2013-09-18 国家电网公司 Wireless transmitting system of partial discharge signal of transformer based on pulse current method detection

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104166080A (en) * 2014-09-05 2014-11-26 国家电网公司 GIS device partial discharge defect simulation device used on non-power-frequency working condition
CN104297651A (en) * 2014-11-06 2015-01-21 国网上海市电力公司 Local discharge test circuit
CN104360244A (en) * 2014-11-07 2015-02-18 华北电力大学 Solid-state transformer partial discharge on-line monitoring method
CN104459499A (en) * 2014-12-27 2015-03-25 中国西电电气股份有限公司 Power capacitor partial discharge measuring device and method
CN104459499B (en) * 2014-12-27 2018-08-31 中国西电电气股份有限公司 A kind of device and method measuring power capacitor partial discharge
CN104698355A (en) * 2015-03-20 2015-06-10 成都吉普斯能源科技有限公司 On-line diagnosing method of high-voltage cable partial discharge
CN105510777A (en) * 2015-11-28 2016-04-20 华中科技大学 Differential pulsed magnet insulation fault detection device
CN105954697B (en) * 2016-06-06 2019-02-22 华北电力大学 A kind of broadband precision calibration method and apparatus of pulses of current sensor
CN105954697A (en) * 2016-06-06 2016-09-21 华北电力大学 Wide band precision calibration method and device of pulse current sensor
CN106249185A (en) * 2016-07-07 2016-12-21 国网北京市电力公司 For demarcating the impedance matching unit of High Frequency Current Sensor, system and method
CN106249185B (en) * 2016-07-07 2020-04-24 国网北京市电力公司 Impedance matching unit, system and method for calibrating high-frequency current sensor
CN107462852A (en) * 2017-06-22 2017-12-12 广西电网有限责任公司电力科学研究院 A kind of scaling method of high frequency partial discharge examination instrument parameter
CN107728091A (en) * 2017-09-20 2018-02-23 国网天津市电力公司电力科学研究院 A kind of device for being used to supervise Existing during Partial Discharge Test for Transformer quality
CN110927540A (en) * 2019-12-09 2020-03-27 国网上海市电力公司 C-GIS intelligent partial discharge monitoring device based on electrified display
CN111458616A (en) * 2020-05-15 2020-07-28 广东电科院能源技术有限责任公司 Device and method for improving signal-to-noise ratio of common-mode interference suppression partial discharge
CN111551833A (en) * 2020-06-12 2020-08-18 天津大学 Cable buffer layer partial discharge test system under extremely inhomogeneous electric field
CN113358988A (en) * 2021-06-08 2021-09-07 国网宁夏电力有限公司电力科学研究院 Partial discharge detection system, method, device, computer equipment and storage medium

Similar Documents

Publication Publication Date Title
CN103913681A (en) System and method for detecting partial discharge under high-frequency voltage
US9513360B2 (en) Method for testing mainframe performance of different types of partial discharge detectors based on analog voltage signal injection
Gao et al. Analysis of the intrinsic characteristics of the partial discharge induced by typical defects in GIS
CN108710074A (en) A kind of partial discharge of switchgear detecting system based on Radio Transmission Technology
Yoshida et al. Evaluation of UHF method for partial discharge measurement by simultaneous observation of UHF signal and current pulse waveforms
CN201269916Y (en) Regional discharging detection system for air insulation combined electrical appliance
CN203811754U (en) An enclosed type gas insulation combined electric appliance partial discharge detection device
CN208654277U (en) A kind of high-tension switch cabinet local discharge on-line monitoring device
KR20140120331A (en) System for analyzing and locating partial discharges
Kweon et al. The analysis of ultrasonic signals by partial discharge and noise from the transformer
CN203191508U (en) GIS partial-discharge detection test platform based on transient-earthing radio waves
CN103558523A (en) Detection device for partial discharge of switch cabinet
CN108919070A (en) A kind of partial discharge of switchgear detection system of Multi-source Information Fusion
CN108680843A (en) A kind of method for detection of partial discharge of switch cabinet based on Radio Transmission Technology
CN112858852A (en) Switch cabinet partial discharge ultrasonic monitoring device and map filtering signal-noise separation method
Wang et al. Application of wavelet-based de-noising to online measurement of partial discharges
CN208421150U (en) A kind of device for Partial Discharge Detection
Elben et al. Modern noise rejection methods and their applicability in partial discharge measurements on HVDC cables
Qi et al. Partial discharge detection for GIS: A comparison between UHF and acoustic methods
Li et al. Study of comparison between Ultra-high Frequency (UHF) method and ultrasonic method on PD detection for GIS
Si et al. UHF characteristic of PD in oil-paper insulation under DC voltage
Luo et al. Study on performance of developed and industrial HFCT sensors
Ding et al. Research on Partial Discharge Detection Technique under Square Wave
Piccin et al. Partial discharge analysis and monitoring in HVDC gas insulated substations
Tang et al. External sensors in partial discharge ultra‐high‐frequency measurements in gas‐insulated substations

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
ASS Succession or assignment of patent right

Owner name: STATE GRID CORPORATION OF CHINA INSTITUTE OF STATE

Effective date: 20141231

C41 Transfer of patent application or patent right or utility model
TA01 Transfer of patent application right

Effective date of registration: 20141231

Address after: 102206 Beijing city Changping District Zhu Daxinzhuang North Agricultural Road No. 2

Applicant after: North China Electric Power University

Applicant after: State Grid Corporation of China

Applicant after: State Grid Smart Grid Institute

Applicant after: China-EPRI Electric Power Engineering Co., Ltd.

Applicant after: Electric Power Research Institute of State Grid Shandong Electric Power Company

Address before: 102206 Beijing city Changping District Zhu Daxinzhuang North Agricultural Road No. 2

Applicant before: North China Electric Power University

C53 Correction of patent for invention or patent application
CB03 Change of inventor or designer information

Inventor after: Pang Yuelong

Inventor after: Lu Xu

Inventor after: Yun Yuxin

Inventor after: Li Qingmin

Inventor after: Han Shuai

Inventor after: Liu Weijie

Inventor after: Wang Gaoyong

Inventor after: Wei Xiaoguang

Inventor after: Zhu Zhenhua

Inventor before: Pang Yuelong

Inventor before: Lu Xu

Inventor before: Li Qingmin

Inventor before: Han Shuai

Inventor before: Liu Weijie

Inventor before: Wang Gaoyong

Inventor before: Wei Xiaoguang

COR Change of bibliographic data

Free format text: CORRECT: INVENTOR; FROM: PANG YUELONG LU XU LI QINGMIN HAN SHUAI LIU WEIJIE WANG GAOYONG WEI XIAOGUANG TO: PANG YUELONG LU XU YUXIN YUN LI QINGMIN HAN SHUAI LIU WEIJIE WANG GAOYONG WEI XIAOGUANG ZHU ZHENHUA

WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20140709