CN104459492B - Power cable pressure test local discharge detection device and detection method - Google Patents
Power cable pressure test local discharge detection device and detection method Download PDFInfo
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- CN104459492B CN104459492B CN201410771226.1A CN201410771226A CN104459492B CN 104459492 B CN104459492 B CN 104459492B CN 201410771226 A CN201410771226 A CN 201410771226A CN 104459492 B CN104459492 B CN 104459492B
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- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 title claims abstract description 16
- 230000001681 protective effect Effects 0.000 claims abstract description 16
- 230000005611 electricity Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910052790 beryllium Inorganic materials 0.000 claims description 4
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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Abstract
The invention provides a kind of power cable pressure test local discharge detection device and detection method,Detection means includes sensor and data acquisition device,The sensor is by resistance in parallel,Satiable inductor and portable protective gaps composition,Sensor one end is connected with power cable external shielding layer,The sensor other end is grounded,Data acquisition device is connected with sensor,When cable produces shelf depreciation,Partial discharge electric current produces pressure drop through sensor on resistance,Gathered and pick up by data acquisition device,Low frequency signal is absorbed by satiable inductor to be filtered out,Realize and the high sensitivity of capacitive power equipment shelf depreciation high-frequency signal is picked up,Low frequency signal is absorbed by satiable inductor to be filtered out,Filter out low-frequency interference signal,With good ground integrity and low frequency signal antijamming capability,So as to accurately detect power cable insulation state,It was found that insulation defect and timely processing.
Description
Technical field
The present invention relates to power cable test device, more particularly to power cable pressure test local discharge detection device
And detection method.
Background technology
As electricity need load maintains sustained and rapid growth, the requirement more and more higher to power supply reliability, urban distribution network is comprehensive
It is to adapt to high reliability and space-saving developing direction to realize cable.With cable application quantity increase and run time
Extension, the detection of cable fault and investigation are difficult also more and more.It is general to choose in order to ensure the safe and reliable operation of cable
While making pressure test to power cable, shelf depreciation is detected using sensor.The detection of shelf depreciation be all with
Various phenomenons caused by partial discharge are foundation, and the state of partial discharge is characterized by that can state the physical quantity of the phenomenon.According to detection
The difference of principle, to have to the sensor main of power cable Partial Discharge Detection at present following several：
1) Electromagnetic coupling method
Electromagnetic coupling method measures cable local discharge, and its core devices is Rogowsky coil, places the coil in cable
On annex, through the ground wire of cable shield, pulse voltage can be induced on coil when shelf depreciation occurs for cable, according to
This detection partial discharge.This method measuring loop is electrically connected with high-tension cable without direct, whole so as to suppress noise well
Covering device small volume, it is easy for installation, it is easy to carry, suitable for execute-in-place.But in detection, high-frequency signal is weaker in itself, passes through
Decay after Rogowsky coil serious, influence Partial Discharge Detection sensitivity.
2) capacitive couplings
Capacitive coupled sensors are to couple energy from the electric field of Partial discharge signal, directly obtain electric signal.Capacitive couplings
Existing metal structure in cable and its joint can be utilized, can also additionally mounted metal capacitive electrode obtain so as to direct-coupling
Pick and place pulsed current signal caused by electricity.External high frequency signal attenuation is big, built-in to need to destroy cable top layer, therefore installs
Technique and technical requirements are complicated, in practice performance difficulty.
3) supercritical ultrasonics technology
, can companion in addition to the loss along with the transfer of electric charge and electric energy when shelf depreciation occurs in power cable
There is sound wave emission phenomena, using ultrasonic sensor, the partial discharge phenomenon in cable and cable accessory can be detected.
The major defect of supercritical ultrasonics technology is that ultrasound signal transmission has serious decay, and ultrasonic wave can be in different mediums
Reflection and refraction are produced on interface, decay is produced on two kinds of interfaces of wave property impedance mismatch, wave impedance different from those is got over
More, ultrasonic signal decay is more severe, and accurate quantification ultrasonic signal amplitude and tangible partial discharge are made it difficult to just because of decay
The relation of amount.
In summary, power cable local discharge sensor is varied, but in antijamming capability, detection sensitivity etc.
Aspect is unable to reach satisfied result.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of power cable pressure test shelf depreciation
Detection means and detection method, realize the high sensitivity pickup to capacitive power equipment shelf depreciation high-frequency signal.
To reach above-mentioned purpose, the present invention uses following technical scheme：
A kind of power cable pressure test local discharge detection device, including sensor and data acquisition device, it is described
Sensor is made up of resistance, satiable inductor and the portable protective gaps of parallel connection, and sensor one end is connected with power cable external shielding layer,
The sensor other end is grounded, and data acquisition device is connected with sensor, and when cable produces shelf depreciation, partial discharge electric current is through sensor
Pressure drop is produced on resistance, is gathered and picks up by data acquisition device, low frequency signal is absorbed by satiable inductor to be filtered out.
Further, the data acquisition device uses oscillograph, voltage tester probe or data collecting card.
Further, the resistance uses the Ω resistance of resistance 50.
Further, inductance value before the satiable inductor saturation>200uH, inductance after saturation<5uH.
A kind of power cable pressure test detection method for local discharge, by resistance, satiable inductor and portable protective gaps simultaneously
Connection composition sensor, sensor one end are connected with power cable external shielding layer to be tested, sensor other end ground connection, power cable
It is powered and gradually steps up voltage, when power cable produces shelf depreciation, low frequency signal is absorbed by satiable inductor, filters out low frequency
Interference signal, high-frequency signal are picked up through voltage signal caused by resistance by data acquisition device, occur protecting when voltage is excessive
Gap discharge forms ground connection.
Further, power cable to be tested is connected by high voltage potential meter with power supply, is adjusted and inputted by high voltage potential meter
Power cable voltage.
Further, the high voltage potential meter is digital potentiometers.
Further, the power supply is powered with independent 380V, and power transformer is enclosed in box made of beryllium Mo alloy materials
In son, cassette housing ground connection.
The present invention is used for power cable On-Site Testing local discharge detection device, including sensor and data acquisition dress
Put, when cable produces shelf depreciation, partial discharge electric current produces voltage signal through sensor on resistance, and voltage signal is by data acquisition
Device collection pickup, the high sensitivity pickup to capacitive power equipment shelf depreciation high-frequency signal is realized, low frequency signal quilt can
Pulsactor absorb filters out, filter out low-frequency interference signal, when occur voltage it is excessive when portable protective gaps discharge to form safety ground, it is right
Do not influenceed in the ground connection of tested power equipment, there is good ground integrity and low frequency signal antijamming capability, so as to accurate
True detection power cable insulation state, find insulation defect and timely processing.
Meanwhile conventional detection devices can not be directly grounded, it is impossible to Exterior cable is directly installed on, due to present invention detection dress
The sensor put is made up of resistance, satiable inductor and the portable protective gaps of parallel connection, and satiable inductor is used to filter out low frequency signal, protects
Shield gap punctures when voltage is excessive, ensure that sensor and personal security, detection means can be connected directly between power cable
Outside, simple installation.
Further, the power supply is powered with independent 380V, and power transformer is enclosed in box made of beryllium Mo alloy materials
In son, cassette housing ground connection, take shielding measure to avoid transformer from producing electromagnetic interference, influence detection process.
Brief description of the drawings
Fig. 1 is the structural representation of local discharge detection device；
Fig. 2 is the equivalent circuit diagram of cable and sensor impedance network.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
Shown in Figure 1, power cable On-Site Testing local discharge detection device of the present invention includes power cable office
Portion is discharged built-in sensor, and by resistance 1, the parallel network of satiable inductor 2 and portable protective gaps 3 is formed the sensor.Wherein
Sensor one terminates the external shielding layer of cable, and other end ground connection, when cable produces shelf depreciation, partial discharge electric current is through sensor in electricity
Pressure drop is produced in resistance 1, is gathered and picks up by data acquisition device, low frequency signal is absorbed by satiable inductor 2 to be filtered out.
Further, the data acquisition device be oscillograph, voltage tester probe, further have data collecting card and
Corresponding Analysis of Partial Discharge software.
Resistance 1, using the Ω of resistance 50 resistance, it is easy to the matching of signal cable, is advantageous to high frequency partial discharge signal
Pickup.
Satiable inductor 2, inductance value before saturation>200uH, inductance after saturation<5uH, it is humorous for power frequency component and each time
It wave impedance very little, can ignore, ensure the reliable ground of cable external shielding layer, do not influence power cable safety ground.
Portable protective gaps 3, in order to prevent destruction of the transient voltage lifting of power cable shield layer to sensor loop, add
Portable protective gaps, puncture when voltage is excessive, ensure that the safety of sensor.
Meanwhile present invention also offers a kind of power cable pressure test detection method for local discharge of detection means,
Resistance 1, satiable inductor 2 and portable protective gaps 3 are composed in parallel into sensor, sensor one end and power cable external shield to be tested
Layer connection, sensor other end ground connection, power cable is powered and gradually steps up voltage, low when power cable generation shelf depreciation
Frequency signal is absorbed by satiable inductor 2, filters out low-frequency interference signal, and high-frequency signal passes through number through voltage signal caused by resistance
Picked up according to harvester, occur voltage it is excessive when portable protective gaps discharge to form ground connection.Power cable to be tested passes through high-voltage potential
Device is connected with power supply, and input electric power voltage cable is adjusted by high voltage potential meter.
Further, the high voltage potential meter is digital potentiometers.Power supply is powered with independent 380V, power transformer envelope
Close made of beryllium Mo alloy materials in box, cassette housing ground connection.
As shown in Fig. 2 to carry out equivalent circuit during measurement of partial discharge using the present invention.
Wherein, resistance 1, satiable inductor 2 and portable protective gaps 3 form sensor network, and cable equivalent circuit includes electric discharge
Gap g4, electric capacity Cg5, electric capacity Cb6, electric capacity Cm7；Electric capacity Cg5 is the electric capacity of the air gap, and electric capacity Cb6 is and portable protective gaps string
The dielectric capacitance of connection, electric capacity Cm7 are then the electric capacity of the intact part of insulation in addition to electric capacity 5Cg, electric capacity 6Cb.Due to electric capacity 5Cg
Begin to discharge in low voltage, therefore equally represented with discharging gap g4 is in parallel with electric capacity Cg5, resistance Zs8 is power supply
Impedance.
Advantage of the present invention is as follows：
1 introduces satiable inductor, at the same realize to low frequency signal filter out and standard to high frequency partial discharge signal
Really obtain；
The selection of 2 detection impedance parameters is advantageous to the transmission of signal；
3 when there is overvoltage in circuit, portable protective gaps breakdown, effectively whole local discharge detection device can be carried out
Protection, ensure that the safety of the detection means.
Claims (3)
- A kind of 1. power cable pressure test detection method for local discharge, it is characterised in that：The device that this method uses is power cable pressure test local discharge detection device, and the device includes sensor sum According to harvester, the sensor is made up of resistance (1), satiable inductor (2) and the portable protective gaps (3) of parallel connection, sensor one End is connected with power cable external shielding layer, and sensor other end ground connection, data acquisition device is connected with sensor, cable generation office When portion discharges, partial discharge electric current produces pressure drop through sensor on resistance (1), is gathered and picks up by data acquisition device, low frequency signal Absorbed and filter out by satiable inductor (2)；The data acquisition device uses oscillograph, voltage tester probe or data collecting card；The resistance (1) uses resistance 50 Ω resistance；Inductance value before satiable inductor (2) saturation>200uH, inductance after saturation<5uH；This method is specially：Resistance (1), satiable inductor (2) and portable protective gaps (3) are composed in parallel into sensor, sensor one end and electric power to be tested Cable external shielding layer connects, and sensor other end ground connection, power cable is powered and gradually steps up voltage, when power cable generation office Portion is discharged, and low frequency signal is absorbed by satiable inductor (2), filters out low-frequency interference signal, high-frequency signal is through electric caused by resistance Pressure signal picked up by data acquisition device, occur voltage it is excessive when portable protective gaps discharge to form ground connection；Power cable to be tested is connected by high voltage potential meter with power supply, and input electric power cable electricity is adjusted by high voltage potential meter Pressure.
- 2. power cable pressure test detection method for local discharge according to claim 1, it is characterised in that：The height Piezoelectric position device is digital potentiometers.
- 3. power cable pressure test detection method for local discharge according to claim 1, it is characterised in that：The electricity Source is powered with independent 380V, and power transformer is enclosed in made of beryllium Mo alloy materials in box, cassette housing ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410771226.1A CN104459492B (en) | 2014-12-12 | 2014-12-12 | Power cable pressure test local discharge detection device and detection method |
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| CN201410771226.1A CN104459492B (en) | 2014-12-12 | 2014-12-12 | Power cable pressure test local discharge detection device and detection method |
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| CN104459492B true CN104459492B (en) | 2018-01-05 |
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| CN108152569A (en) * | 2017-11-29 | 2018-06-12 | 杭州柯林电气股份有限公司 | Cable overvoltage signal detection method and device |
| CN108614198B (en) * | 2018-04-20 | 2021-06-01 | 广东电网有限责任公司广州供电局 | High-voltage cable voltage-withstand test distributed partial discharge detection system and detection method thereof |
| CN111537847A (en) * | 2020-04-28 | 2020-08-14 | 江苏大学 | Mobile partial discharge remote diagnosis detection system and partial discharge positioning method |
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| JP2535292B2 (en) * | 1992-10-23 | 1996-09-18 | 大電株式会社 | A method for diagnosing deterioration of cable insulation performance. |
| CN103207355B (en) * | 2012-01-13 | 2016-02-03 | 国家电网公司 | Cable local discharge signal detection system and method |
| CN102981106B (en) * | 2012-11-12 | 2015-05-06 | 华北电力大学 | Online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge |
| CN103472374A (en) * | 2013-08-28 | 2013-12-25 | 国网浙江省电力公司嘉兴供电公司 | Online GIS (gas insulated switchgear) partial discharge monitoring device |
| CN103513158B (en) * | 2013-09-18 | 2017-01-11 | 西安交通大学 | Damped oscillatory wave lower cable local discharge detection device and method |
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Inventor after: Chang Jiang Inventor after: Bai Xiaobin Inventor after: Xue Jun Inventor after: Shi Yaosheng Inventor after: Zhou Yihuan Inventor after: Wang Jun Inventor after: Xu Bin Qi Inventor after: Cao Baoqin Inventor before: Chang Jiang Inventor before: Bai Xiaobin Inventor before: Shi Yaosheng Inventor before: Xu Bin Qi Inventor before: Cao Baoqin Inventor before: Wang Junjie Inventor before: Deng Yangyi |
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Inventor after: Liu Yaohui Inventor after: Cao Baoqin Inventor after: Chang Jiang Inventor after: Bai Xiaobin Inventor after: Xue Jun Inventor after: Shi Yaosheng Inventor after: Zhou Yihuan Inventor after: Wang Jun Inventor after: Luo Xubin Inventor after: Cai Zhonglin Inventor before: Chang Jiang Inventor before: Bai Xiaobin Inventor before: Xue Jun Inventor before: Shi Yaosheng Inventor before: Zhou Yihuan Inventor before: Wang Jun Inventor before: Xu Bin Qi Inventor before: Cao Baoqin |
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Effective date of registration: 20240509 Address after: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Patentee after: STATE GRID CORPORATION OF CHINA Country or region after: China Patentee after: State Grid Shaanxi Electric Power Co., Ltd. Baoji Power Supply Co. Patentee after: National Network (Xi'an) Environmental Protection Technology Center Co.,Ltd. Address before: 100761 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Patentee before: State Grid Corporation of China Country or region before: China Patentee before: BAOJI POWER SUPPLY COMPANY OF STATE GRID SHAANXI ELECTRIC POWER Co. |
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