CN102368089A - Test method of carrying out partial discharge measurement based on high-voltage cable voltage withstand test - Google Patents
Test method of carrying out partial discharge measurement based on high-voltage cable voltage withstand test Download PDFInfo
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- CN102368089A CN102368089A CN2011103636744A CN201110363674A CN102368089A CN 102368089 A CN102368089 A CN 102368089A CN 2011103636744 A CN2011103636744 A CN 2011103636744A CN 201110363674 A CN201110363674 A CN 201110363674A CN 102368089 A CN102368089 A CN 102368089A
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Abstract
A test method of carrying out a distributed partial discharge measurement based on a high-voltage cable voltage withstand test is disclosed. A system comprises the following hardware equipment: an alternative current frequency conversion resonance power supply without partial discharge, a high voltage power cable line, a cable terminal, a cable joint, a high-frequency partial discharge sensor, a signal acquisition unit, a fiber, a measuring host and the like. While the high-voltage cable voltage withstand test is performed, the distributed partial discharge measurement is performed. By using the method of the invention, small partial discharge defects which can not be detected by the voltage withstand test on the high voltage cable line can be detected. Simultaneously, a signal attenuation problem generated when the partial discharge is measured from one end can be solved. An effective and sensitive method is provided for examination and determination of high voltage cable line construction quality and insulation quality.
Description
Technical field
When the present invention relates to check and accept at the scene high-tension cable completion circuit, the test method that cable system construction quality and insulation quality are tested and judged is a kind of test method of the measurement of partial discharge based on the high-tension cable withstand voltage test.
Background technology
According to existing high-tension cable completion test standard, cable line should be able to detect owing to transport and lay the bigger defective that causes through after the withstand voltage test, still still exists some behind overtesting, at the example that puts into operation and just puncture soon.Main cause is because withstand voltage test can not more detected little offices be put defective.Voltage Cable Lines Construction is after operation a period of time, and these little offices put defective and enlarge gradually, finally cause the puncture of cable line.At present, all cable lines are checked and accepted the requirement that the commissioning test standard all only relates to withstand voltage test, like Q/GDW371, IEC60270, IEC60840 etc., do not propose the shelf depreciation requirement.And for check cable completion line construction quality and insulation quality, measurement of partial discharge is the most effective and sensitive means.
Summary of the invention
The problem that the present invention will solve is: when high-tension cable completion circuit is carried out onsite acceptance; Withstand voltage test can not detect some little offices and put defective; Judge cable system construction quality and insulation quality for check more strictly, need a kind of test method directly perceived, desirable, effective.The decay of local discharge signal on high-tension cable simultaneously launches with exponential manner; Research shows that every kilometer attenuation rate reaches 90%; According to CIGRE D1.33 " Limits of on-site PDmeasurement on extruded power cables using IEC method "; Under optimum field condition, the measurement that the office of 50pC puts can only realize on the cable of 2 kilometers following length.And mostly Voltage Cable Lines Construction is long distance line, so the Partial Discharge Detection of high-tension cable completion circuit can't adopt the conventional mode of carrying out from the termination.
Technical scheme of the present invention is: the test method of measurement of partial discharge is carried out in the high-tension cable withstand voltage test simultaneously; Carry out withstand voltage test during cable final acceptance of construction test; Carry out distributed measurement of partial discharge when carrying out cable final acceptance of construction test; Pilot system comprises: AC frequency conversion resonance vibration power supply, Voltage Cable Lines Construction, cable termination, cable splice, high frequency partial discharge sensor, local discharge signal collecting unit, optical fiber and measurement host are put in no office; High frequency partial discharge sensor and local discharge signal collecting unit are installed on the ground wire of each cable splice or cross interconnected line; High frequency partial discharge sensor signal is transferred to the local discharge signal collecting unit through concentric cable; Through optical fiber all local discharge signal collecting units are joined end to end, finally receive on the measurement host that is positioned at the Voltage Cable Lines Construction end, the high frequency partial discharge sensor is installed on the ground wire of 2 cable terminations; Before the test; Cross interconnected line and ground wire to cable splice carry out cross-over connection; The high frequency partial discharge sensor connects bonding line; On the ground wire of cable termination, obtain the measurement synchronization signal with the electric current coupling coil, total system is by the measurement of said all check points of synchronized, in the process of withstand voltage test; No office puts the AC frequency conversion resonance vibration power supply withstand voltage test is carried out in Voltage Cable Lines Construction pressurization, and all intermediate cable joints and two cable terminations to Voltage Cable Lines Construction carry out measurement of partial discharge simultaneously simultaneously.
When the high frequency partial discharge sensor carried out in-site measurement through ground wire and cross interconnected line, signal frequency was 2MHz～8MHz.
To Voltage Cable Lines Construction pressurization 1 hour; In the process of withstand voltage test in 1 hour, all the intermediate cable joints on the circuit and two cable terminations are carried out measurement of partial discharge simultaneously; Measurement host is placed in the pulpit of withstand voltage test equipment, and each local discharge signal collecting unit adopts powered battery.
The present invention carries out measurement of partial discharge in withstand voltage test; Great constructional deficiency is found in withstand voltage test; The measurement of partial discharge that carries out simultaneously can be found the small shelf depreciation defective that possibly exist in the cable accessory; These small defectives can not be found by simple withstand voltage test, when carrying out withstand voltage test, carry out distributed measurement of partial discharge, the shelf depreciation defective that exists in measured X LPE insulated power cable and the annex thereof exactly.The signal frequency of the high frequency partial discharge sensor that the present invention confirms has sensitivity preferably; Carry out measurement of partial discharge at each cable splice; Be aggregated into measurement host by optical fiber then; This distributed shelf depreciation the measurement effective range of shelf depreciation be limited in the joint annex approximately+/-300 meters scopes in, lowered the difficulty of point of discharge location greatly.
Description of drawings
Fig. 1 is the distributed measurement of partial discharge pilot system figure based on the high-tension cable withstand voltage test of the present invention.
Embodiment
When the high-tension cable completion test is checked and accepted, mainly be through the defective mounting of on-the-spot withstand voltage test check cable splice and the damage in the cable transportation installation process.The test experience shows that the withstand voltage test of carrying out according to the IEC standard can well produce a desired effect.Problem of manufacturing qualities for cable body should be checked by the cable delivery test, but the cable body breakdown accident also occurred in recent years.Therefore when final acceptance of construction is tested, following requirement has been proposed:
● the small shelf depreciation defective that exists in the discovery cable body
● the small shelf depreciation defective that exists in the discovery cable splice, 1 hour withstand voltage test can not puncture it.
In addition, owing to the attenuation of cable to high-frequency signal, shelf depreciation if take place in the place that the range observation end is far away, and its signal is transferred to the big high attenuation of measuring junction meeting, and is different according to survey frequency, every kilometer length cables, and signal attenuation can reach 90% sometimes.Therefore, the method at the additional measurement of partial discharge of cable line one end commonly used is only applicable to the relatively shorter situation of cable line length.According to testing experience for many years, in midium voltage cable, because the joint discharge can reach the thousands of pC of hundreds of; Influence to cable is little, but in high-tension cable, very little discharge capacity is enough to cable is produced fatal harm; The method of putting with an end survey bureau detects micro-discharge capacity, is very difficult.
When carrying out cable final acceptance of construction test, the inventive method carries out distributed measurement of partial discharge.Like Fig. 1; Pilot system comprises: AC frequency conversion resonance vibration power supply A, Voltage Cable Lines Construction, cable termination C, cable splice D1-D6, high frequency partial discharge sensor, local discharge signal collecting unit E1-E6, optical fiber and measurement host B are put in no office; High frequency partial discharge sensor and local discharge signal collecting unit are installed on the ground wire of each cable splice or cross interconnected line; High frequency partial discharge sensor signal is transferred to the local discharge signal collecting unit through concentric cable; Through optical fiber all local discharge signal collecting units are joined end to end; Finally receive on the measurement host that is positioned at the Voltage Cable Lines Construction end, the high frequency partial discharge sensor is installed on the ground wire of 2 cable terminations; Before the test; Cross interconnected line and ground wire to cable splice carry out cross-over connection; The high frequency partial discharge sensor connects bonding line; On the ground wire of cable termination, obtain measurement synchronization signal F with the electric current coupling coil, total system is by the measurement of said all check points of synchronized, in the process of withstand voltage test; No office puts the AC frequency conversion resonance vibration power supply withstand voltage test is carried out in Voltage Cable Lines Construction pressurization, and all intermediate cable joints and two cable terminations to Voltage Cable Lines Construction carry out measurement of partial discharge simultaneously simultaneously.
Claims (3)
1. the test method of measurement of partial discharge is carried out in the high-tension cable withstand voltage test simultaneously; Carry out withstand voltage test during cable final acceptance of construction test; Carry out distributed measurement of partial discharge when it is characterized in that carrying out cable final acceptance of construction test; Pilot system comprises: AC frequency conversion resonance vibration power supply, Voltage Cable Lines Construction, cable termination, cable splice, high frequency partial discharge sensor, local discharge signal collecting unit, optical fiber and measurement host are put in no office; High frequency partial discharge sensor and local discharge signal collecting unit are installed on the ground wire of each cable splice or cross interconnected line; High frequency partial discharge sensor signal is transferred to the local discharge signal collecting unit through concentric cable; Through optical fiber all local discharge signal collecting units are joined end to end, finally receive on the measurement host that is positioned at the Voltage Cable Lines Construction end, the high frequency partial discharge sensor is installed on the ground wire of 2 cable terminations; Before the test; Cross interconnected line and ground wire to cable splice carry out cross-over connection; The high frequency partial discharge sensor connects bonding line; On the ground wire of cable termination, obtain the measurement synchronization signal with the electric current coupling coil, total system is by the measurement of said all check points of synchronized, in the process of withstand voltage test; No office puts the AC frequency conversion resonance vibration power supply withstand voltage test is carried out in Voltage Cable Lines Construction pressurization, and all intermediate cable joints and two cable terminations to Voltage Cable Lines Construction carry out measurement of partial discharge simultaneously simultaneously.
2. the test method of measurement of partial discharge is carried out in high-tension cable withstand voltage test according to claim 1 simultaneously, and when it is characterized in that the high frequency partial discharge sensor carries out in-site measurement through ground wire and cross interconnected line, signal frequency is 2MHz～8MHz.
3. the test method of measurement of partial discharge is carried out in high-tension cable withstand voltage test according to claim 1 and 2 simultaneously; It is characterized in that Voltage Cable Lines Construction pressurization 1 hour; In the process of withstand voltage test in 1 hour, all the intermediate cable joints on the circuit and two cable terminations are carried out measurement of partial discharge simultaneously; Measurement host is placed in the pulpit of withstand voltage test equipment, and each local discharge signal collecting unit adopts powered battery.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590684A (en) * | 2012-03-08 | 2012-07-18 | 江苏新亚高电压测试设备有限公司 | Full-automatic insulated comprehensive testing device |
| CN103809093A (en) * | 2014-02-19 | 2014-05-21 | 广西电网公司电力科学研究院 | Test equipment for partial discharge of variable-frequency resonant cable based on optical electric field transducer |
| CN103809092A (en) * | 2014-02-19 | 2014-05-21 | 广西电网公司电力科学研究院 | Test equipment for partial discharge of oscillatory wave cable based on optical electric field transducer |
| CN103913685A (en) * | 2014-04-15 | 2014-07-09 | 国家电网公司 | Cable partial discharge detection system based on frequency conversion resonance voltage resistance |
| CN104898081A (en) * | 2015-06-05 | 2015-09-09 | 北京兴迪仪器有限责任公司 | On-site calibration method for alternating-current high-voltage cable distributed partial discharge detection system |
| CN105190332A (en) * | 2013-02-08 | 2015-12-23 | B2电子有限公司 | Mobile high-voltage tester |
| CN105353278A (en) * | 2015-10-26 | 2016-02-24 | 中国十七冶集团有限公司 | Crown block high-voltage power supply system electrical equipment whole alternating-current withstand voltage testing method |
| CN106646152A (en) * | 2016-11-18 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | High voltage cable partial discharge detection method and device |
| CN108279366A (en) * | 2018-04-20 | 2018-07-13 | 广州供电局有限公司 | The distributed detection method for local discharge and device of high-tension cable pressure test |
| 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 |
| CN109298300A (en) * | 2018-12-04 | 2019-02-01 | 武汉康电电气有限公司 | One kind being used for part discharge test system and method when high-tension cable pressure test |
| CN109752634A (en) * | 2019-03-01 | 2019-05-14 | 浙江新图维电子科技有限公司 | A kind of cable connector resonant mode mutual inductance partial discharge detection device and detection method |
| CN110749809A (en) * | 2019-11-11 | 2020-02-04 | 深圳供电局有限公司 | GIS fault detection device and system |
| CN110967604A (en) * | 2019-12-24 | 2020-04-07 | 武汉华威众科电力有限公司 | Cable partial discharge test platform test system |
| CN112904160A (en) * | 2021-01-21 | 2021-06-04 | 东莞市嘉仕新能电子仪器设备有限公司 | Synchronous testing method for high-voltage machine, synchronous high-voltage machine and synchronous high-voltage machine working group |
| CN113030661A (en) * | 2021-03-08 | 2021-06-25 | 深圳供电局有限公司 | Cable buffer layer defect detection equipment and method |
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590684B (en) * | 2012-03-08 | 2014-08-20 | 江苏新亚高电压测试设备有限公司 | Full-automatic insulated comprehensive testing device |
| CN102590684A (en) * | 2012-03-08 | 2012-07-18 | 江苏新亚高电压测试设备有限公司 | Full-automatic insulated comprehensive testing device |
| CN105190332B (en) * | 2013-02-08 | 2019-01-22 | B2电子有限公司 | Moveable high-pressure test equipment |
| CN105190332A (en) * | 2013-02-08 | 2015-12-23 | B2电子有限公司 | Mobile high-voltage tester |
| CN103809093B (en) * | 2014-02-19 | 2016-08-17 | 广西电网公司电力科学研究院 | The frequency conversion resonance vibration cable local discharge test equipment of optically-based electric-field sensor |
| CN103809092B (en) * | 2014-02-19 | 2016-08-17 | 广西电网公司电力科学研究院 | The wave of oscillation cable local discharge test equipment of optically-based electric-field sensor |
| CN103809092A (en) * | 2014-02-19 | 2014-05-21 | 广西电网公司电力科学研究院 | Test equipment for partial discharge of oscillatory wave cable based on optical electric field transducer |
| CN103809093A (en) * | 2014-02-19 | 2014-05-21 | 广西电网公司电力科学研究院 | Test equipment for partial discharge of variable-frequency resonant cable based on optical electric field transducer |
| CN103913685A (en) * | 2014-04-15 | 2014-07-09 | 国家电网公司 | Cable partial discharge detection system based on frequency conversion resonance voltage resistance |
| CN104898081A (en) * | 2015-06-05 | 2015-09-09 | 北京兴迪仪器有限责任公司 | On-site calibration method for alternating-current high-voltage cable distributed partial discharge detection system |
| CN105353278A (en) * | 2015-10-26 | 2016-02-24 | 中国十七冶集团有限公司 | Crown block high-voltage power supply system electrical equipment whole alternating-current withstand voltage testing method |
| CN105353278B (en) * | 2015-10-26 | 2018-03-06 | 中国十七冶集团有限公司 | A kind of overhead traveling crane high voltage supply system electrical equipment whole group ac voltage withstanding test method |
| CN106646152A (en) * | 2016-11-18 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | High voltage cable partial discharge detection method and device |
| CN108279366A (en) * | 2018-04-20 | 2018-07-13 | 广州供电局有限公司 | The distributed detection method for local discharge and device of high-tension cable pressure test |
| 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 |
| CN108279366B (en) * | 2018-04-20 | 2020-08-14 | 广州供电局有限公司 | Distributed partial discharge detection method and device for high-voltage cable voltage withstand test |
| CN109298300A (en) * | 2018-12-04 | 2019-02-01 | 武汉康电电气有限公司 | One kind being used for part discharge test system and method when high-tension cable pressure test |
| CN109752634A (en) * | 2019-03-01 | 2019-05-14 | 浙江新图维电子科技有限公司 | A kind of cable connector resonant mode mutual inductance partial discharge detection device and detection method |
| CN109752634B (en) * | 2019-03-01 | 2024-02-27 | 浙江新图维电子科技有限公司 | Cable joint resonant mutual inductance partial discharge detection device and detection method |
| CN110749809A (en) * | 2019-11-11 | 2020-02-04 | 深圳供电局有限公司 | GIS fault detection device and system |
| CN110967604A (en) * | 2019-12-24 | 2020-04-07 | 武汉华威众科电力有限公司 | Cable partial discharge test platform test system |
| CN110967604B (en) * | 2019-12-24 | 2021-11-23 | 武汉华威众科电力有限公司 | Cable partial discharge test platform test system |
| CN112904160A (en) * | 2021-01-21 | 2021-06-04 | 东莞市嘉仕新能电子仪器设备有限公司 | Synchronous testing method for high-voltage machine, synchronous high-voltage machine and synchronous high-voltage machine working group |
| CN113030661A (en) * | 2021-03-08 | 2021-06-25 | 深圳供电局有限公司 | Cable buffer layer defect detection equipment and method |
| CN113030661B (en) * | 2021-03-08 | 2024-01-19 | 深圳供电局有限公司 | Cable buffer layer defect detection device and method |
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Effective date of registration: 20130403 Address after: 210008 Zhongshan Road, Jiangsu, No. 251, Applicant after: Nanjing Power Supply Co., Jiangsu Prov. Power Co. Applicant after: Beijing Sindia Instruments Co., Ltd. Applicant after: State Grid Corporation of China Applicant after: Jiangsu Electric Power Company Address before: 210008 Zhongshan Road, Jiangsu, No. 251, Applicant before: Nanjing Power Supply Co., Jiangsu Prov. Power Co. Applicant before: Beijing Sindia Instruments Co., Ltd. |
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