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 PDFInfo
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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
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.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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Cited By (17)
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| 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 |
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