CN104459492A - Partial discharge detection device and detection method for power cable voltage-withstand test - Google Patents
Partial discharge detection device and detection method for power cable voltage-withstand test Download PDFInfo
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- CN104459492A CN104459492A CN201410771226.1A CN201410771226A CN104459492A CN 104459492 A CN104459492 A CN 104459492A CN 201410771226 A CN201410771226 A CN 201410771226A CN 104459492 A CN104459492 A CN 104459492A
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- 238000001514 detection method Methods 0.000 title claims abstract description 34
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- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 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
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- 238000009413 insulation Methods 0.000 abstract description 5
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- 238000013480 data collection Methods 0.000 abstract 3
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 5
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- 230000035945 sensitivity Effects 0.000 description 4
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
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Abstract
The invention provides a partial discharge detection device and detection method for a power cable voltage-withstand test. The detection device comprises a sensor and a data collection device. The sensor is composed of resistors connected in parallel, satiable inductors and protection gaps, one end of the sensor is connected with an outer shielding layer of a power cable, the other end of the sensor is grounded, and the data collection device is connected with the sensor. In the process of partial discharge of the cable, partial discharge current generates voltage drop on the resistors through the sensor, drop voltage is picked up by the data collection device, low-frequency signals are absorbed and filtered out by the satiable inductors, and then high-flexibility pick up on partial discharge high-frequency signals of capacitive type power equipment is achieved. The low-frequency signals are filtered out by the satiable inductors, low-frequency interference signals are filtered out, so the detection device has excellent grounding safety and low-frequency signal anti-interference capacity; thus, the state of insulation of the power cable can be detected accurately, and insulation defects can be found and treated in time.
Description
Technical field
The present invention relates to power cable test device, particularly relate to power cable withstand voltage test local discharge detection device and detection method.
Background technology
Along with electricity need load maintains sustained and rapid growth, more and more higher to the requirement of power supply reliability, urban distribution network round Realization cable adapts to high reliability and space-saving developing direction.Along with increasing and the prolongation of working time of cable application quantity, detection and the investigation difficulty of cable fault also get more and more.In order to ensure the safe and reliable operation of cable, generally choosing while withstand voltage test is done to power cable, utilizing sensor to detect shelf depreciation.The detection of shelf depreciation is all put produced various phenomenons for foundation, the state of being put by the physical quantity office of sign stating this phenomenon with office.According to the difference of Cleaning Principle, at present the sensor of power cable Partial Discharge Detection is mainly contained following several:
1) Electromagnetic coupling method
Electromagnetic coupling method measures cable local discharge, and its core devices is Rogowsky coil, is placed on by coil on cable accessory, and through the ground wire of cable shield, can induce pulse voltage on coil when cable generation shelf depreciation, detection office puts accordingly.The method measuring circuit and high-tension cable, thus can well restraint speckle without direct electrical connection, and package unit volume is little, easy for installation, is easy to carry, and is suitable for execute-in-place.But high-frequency signal itself is more weak when detecting, after Rogowsky coil, decay is serious, affects Partial Discharge Detection sensitivity.
2) capacitive couplings
Capacitive coupled sensors is coupling energy from the electric field of Partial discharge signal, directly obtains electric signal.Capacitive couplings can utilize existing metal construction in cable and joint thereof, also can install metal capacitive electrode in addition thus the pulsed current signal of direct-coupling acquisition electric discharge generation.External high frequency signal attenuation is large, and built-in needs destroys cable top layer, therefore mounting process and technical requirement complexity, performance difficulty in practice.
3) supercritical ultrasonics technology
When there is shelf depreciation in power cable, except along with except the transfer of electric charge and the loss of electric energy, understand with acoustic emission phenomenon, use ultrasonic sensor, phenomenon is put in the office that can detect in cable and cable accessory.
The major defect of supercritical ultrasonics technology is that ultrasound signal transmission has serious decay, ultrasound wave can produce reflection and refraction on different groud surface, two kinds of interfaces of wave property impedance mismatch produce decay, wave impedance different from those is more, ultrasonic signal decay is more severe, makes to be difficult to accurate quantification ultrasonic signal amplitude and tangible office relation high-volume just because of decay.
In sum, power cable local discharge sensor is varied, but at antijamming capability, the aspects such as detection sensitivity all cannot reach satisfied result.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of power cable withstand voltage test local discharge detection device and detection method are provided, realize picking up the high sensitivity of capacitive power equipment shelf depreciation high-frequency signal.
For achieving the above object, the present invention by the following technical solutions:
A kind of power cable withstand voltage test local discharge detection device; comprise sensor and data collector; described sensor is made up of the resistance of parallel connection, satiable inductor and portable protective gaps; sensor one end is connected with power cable external shielding layer, sensor other end ground connection, and data collector is connected with sensor; when cable produces shelf depreciation; office's discharge stream produces pressure drop through sensor on resistance, and picked up by data collector collection, low frequency signal is absorbed filtering by satiable inductor.
Further, described data collector adopts oscillograph, voltage tester probe or data collecting card.
Further, described resistance adopts resistance 50 Ω resistance.
Further, the saturated front inductance value >200uH of described satiable inductor, saturated rear inductance L EssT.LTssT.LT5uH.
A kind of power cable withstand voltage test detection method for local discharge; resistance, satiable inductor and portable protective gaps are composed in parallel sensor; sensor one end is connected with power cable external shielding layer to be tested; sensor other end ground connection; power cable energising also improves voltage gradually; when power cable produces shelf depreciation; low frequency signal is absorbed by satiable inductor; filtering low-frequency interference signal; the voltage signal that high-frequency signal produces through resistance is picked up by data collector, and when occurring that voltage is excessive, portable protective gaps electric discharge forms ground connection.
Further, power cable to be tested is connected with power supply by high voltage potential meter, regulates input electric power voltage cable by high voltage potential meter.
Further, described high voltage potential meter is digital potentiometers.
Further, described power supply is powered with independently 380V, and power transformer is enclosed in the box that beryllium Mo alloy material makes, cassette housing ground connection.
The present invention is used for power cable On-Site Testing local discharge detection device, comprise sensor and data collector, when cable produces shelf depreciation, office's discharge stream produces voltage signal through sensor on resistance, voltage signal is picked up by data collector collection, realize picking up the high sensitivity of capacitive power equipment shelf depreciation high-frequency signal, low frequency signal is absorbed filtering by satiable inductor, filtering low-frequency interference signal, when occurring that voltage is excessive, portable protective gaps electric discharge forms safety ground, ground connection for tested power equipment does not affect, there is good ground integrity and low frequency signal antijamming capability, thus detect power cable insulation state accurately, find insulation defect and process in time.
Simultaneously; conventional detection devices cannot direct ground connection; Exterior cable can not be directly installed on; because the sensor of pick-up unit of the present invention is made up of the resistance of parallel connection, satiable inductor and portable protective gaps; satiable inductor is used for filtering low frequency signal, and portable protective gaps punctures when voltage is excessive, ensure that sensor and personal security; pick-up unit can be connected directly between power cable outside, simple installation.
Further, described power supply is powered with independently 380V, and power transformer is enclosed in the box that beryllium Mo alloy material makes, and cassette housing ground connection, takes shielding measure to avoid transformer to produce electromagnetic interference (EMI), affect testing process.
Accompanying drawing explanation
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
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Shown in Figure 1, power cable On-Site Testing local discharge detection device of the present invention comprises power cable shelf depreciation built-in sensor, and this sensor is by resistance 1, and the parallel network of satiable inductor 2 and portable protective gaps 3 is formed.The wherein external shielding layer of sensor one terminated cable, other end ground connection, when cable produces shelf depreciation, office's discharge stream produces pressure drop through sensor on resistance 1, is picked up by data collector collection, and low frequency signal is absorbed filtering by satiable inductor 2.
Further, described data collector is oscillograph, voltage tester probe, further has data collecting card and corresponding Analysis of Partial Discharge software.
Resistance 1, adopts the resistance of resistance 50 Ω, is convenient to the coupling of signal cable, is conducive to the pickup of high frequency partial discharge signal.
Satiable inductor 2, saturated front inductance value >200uH, saturated rear inductance L EssT.LTssT.LT5uH, for power frequency component and each harmonic impedance very little, can ignore, ensure the reliable ground of cable external shielding layer, do not affect power cable safety ground.
Portable protective gaps 3, in order to prevent the transient voltage lifting of power cable shield layer to the destruction of sensor loop, adding portable protective gaps, puncturing when voltage is excessive, ensure that the safety of sensor.
Simultaneously, present invention also offers a kind of power cable withstand voltage test detection method for local discharge of pick-up unit, by resistance 1, satiable inductor 2 and portable protective gaps 3 compose in parallel sensor, sensor one end is connected with power cable external shielding layer to be tested, sensor other end ground connection, power cable energising also improves voltage gradually, when power cable produces shelf depreciation, low frequency signal is absorbed by satiable inductor 2, filtering low-frequency interference signal, the voltage signal that high-frequency signal produces through resistance is picked up by data collector, when occurring that voltage is excessive, portable protective gaps electric discharge forms ground connection.Power cable to be tested is connected with power supply by high voltage potential meter, regulates input electric power voltage cable by high voltage potential meter.
Further, described high voltage potential meter is digital potentiometers.Power supply is powered with independently 380V, and power transformer is enclosed in the box that beryllium Mo alloy material makes, cassette housing ground connection.
As shown in Figure 2, for using the present invention to carry out measurement of partial discharge equivalent electrical circuit time.
Wherein, resistance 1, satiable inductor 2 and portable protective gaps 3 form sensor network, and cable equivalent electrical circuit comprises discharging gap g4, electric capacity Cg5, electric capacity Cb6, electric capacity Cm7; Electric capacity Cg5 is the electric capacity of clearance, and electric capacity Cb6 is the dielectric capacitance of connecting with portable protective gaps, and electric capacity Cm7 is then the electric capacity of the intact part of insulation except electric capacity 5Cg, electric capacity 6Cb.Because electric capacity 5Cg just starts electric discharge when low voltage, therefore represent with discharging gap g4 is in parallel with electric capacity Cg5 equivalently, resistance Zs8 is the impedance of power supply.
Advantage of the present invention is as follows:
1 introduces satiable inductor, achieves the filtering of low frequency signal and the Obtaining Accurate to high frequency partial discharge signal simultaneously;
2 detect impedance parameters choose the transmission being conducive to signal;
3 when there is superpotential in circuit, and portable protective gaps punctures, and effectively can protect whole local discharge detection device, ensure that the safety of this pick-up unit.
Claims (8)
1. a power cable withstand voltage test local discharge detection device, it is characterized in that: comprise sensor and data collector, described sensor is by the resistance (1) of parallel connection, satiable inductor (2) and portable protective gaps (3) composition, sensor one end is connected with power cable external shielding layer, sensor other end ground connection, data collector is connected with sensor, when cable produces shelf depreciation, office's discharge stream produces pressure drop through sensor on resistance (1), picked up by data collector collection, low frequency signal is absorbed filtering by satiable inductor (2).
2. power cable withstand voltage test local discharge detection device according to claim 1, is characterized in that: described data collector adopts oscillograph, voltage tester probe or data collecting card.
3. power cable withstand voltage test local discharge detection device according to claim 1, is characterized in that: described resistance (1) adopts resistance 50 Ω resistance.
4. power cable withstand voltage test local discharge detection device according to claim 1, is characterized in that: the saturated front inductance value >200uH of described satiable inductor (2), saturated rear inductance L EssT.LTssT.LT5uH.
5. the power cable withstand voltage test detection method for local discharge of a claim 1-4 pick-up unit, it is characterized in that: by resistance (1), satiable inductor (2) and portable protective gaps (3) compose in parallel sensor, sensor one end is connected with power cable external shielding layer to be tested, sensor other end ground connection, power cable energising also improves voltage gradually, when power cable produces shelf depreciation, low frequency signal is absorbed by satiable inductor (2), filtering low-frequency interference signal, the voltage signal that high-frequency signal produces through resistance is picked up by data collector, when occurring that voltage is excessive, portable protective gaps electric discharge forms ground connection.
6. power cable withstand voltage test detection method for local discharge according to claim 5, is characterized in that: power cable to be tested is connected with power supply by high voltage potential meter, regulates input electric power voltage cable by high voltage potential meter.
7. power cable withstand voltage test detection method for local discharge according to claim 6, is characterized in that: described high voltage potential meter is digital potentiometers.
8. power cable withstand voltage test detection method for local discharge according to claim 6, is characterized in that: described power supply is powered with independently 380V, and power transformer is enclosed in the box that beryllium Mo alloy material makes, 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 CN104459492B (en) | 2018-01-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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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| CN104459492B (en) | 2018-01-05 |
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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. |