CN104569769A - Power cable partial discharge simulation system and testing method - Google Patents
Power cable partial discharge simulation system and testing method Download PDFInfo
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- CN104569769A CN104569769A CN201510044358.9A CN201510044358A CN104569769A CN 104569769 A CN104569769 A CN 104569769A CN 201510044358 A CN201510044358 A CN 201510044358A CN 104569769 A CN104569769 A CN 104569769A
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Abstract
The invention discloses a power cable partial discharge simulation system and testing method. The system comprises a pulse generating unit, a measuring unit, pulse detecting unit and a pulse transponder, wherein the control output end of the measuring unit is connected with the drive pulse control input end of the pulse generating unit, the drive pulse output end of the pulse generating unit is connected with the near end of a power cable through a first high-frequency current transformer, the input end of the measuring unit is connected with the near end of the power cable through second high-frequency current transformer, the input end of the pulse detecting unit is connected with the far end of the power cable through a third high-frequency current transformer, the output end of the pulse detecting unit is connected with the pulse transponder, and the pulse transponder is connected with the far end of the power cable through a fourth high-frequency current transformer. The power cable partial discharge simulation system has the advantages that partial discharge signal positions can be detected accurately, cable faults can be discovered in advance to facilitate prevention, and the system is high in interference resistance and promising in application prospect.
Description
Technical field
The present invention relates to a kind of power cable shelf depreciation analogue system and method for testing, belong to electric device maintenance technical field.
Background technology
Along with the development of China's modernization construction and the continuous progress of science and technology, China has had the research of cable, manufacture and application and has developed rapidly.From power house to urban and rural power grids, from distribution substation to factory street, cable line is with its unique feature, and obtain applying more and more widely, its quantity is doubled and redoubled, and plays the irreplaceable effect of pole line in many occasions.Huge like this and in the cable system of complexity, due to the quality of production of cable, construction wrong, operation maintenance is not good at waiting factors, cable fault will be caused, ensureing that cable normally runs is the emphasis guaranteeing reliable power supply, insulation ag(e)ing situation accounts for very large proportion, therefore cable insulation situation is one of important means ensureing reliable power supply, best method is that we can judge in advance, prevent in advance, fix a breakdown ahead of time, current Main Means carries out detection and positioning by the method for power failure prerun, because this method needs to have a power failure, certain economic loss can be brought, if we can assess the duty of cable in time, find the fault of cable in advance, and can the reason of charged failure judgement and position, we just can make prevention in advance like this, prevent the generation of serious accident, but, the on-the-spot strong-electromagnetic field interference source that cable runs in work is more, accuracy of data acquisition is not high, the original waveform Severe distortion distortion of collection signal, easy misleading erroneous judgement, even fail to judge, how to improve the degree of accuracy of the working state evaluation of cable, current urgent problem.
Summary of the invention
Object of the present invention overcomes the existing method by power failure prerun and carries out detection and positioning, needs to have a power failure, and can bring certain economic loss, how improve the problem of the degree of accuracy of the working state evaluation of cable.Power cable shelf depreciation analogue system of the present invention and method of testing, the local discharge signal in operation on power cable can be caught, the position of local discharge signal detected accurately, find the fault of cable in advance, make prevention, prevent the generation of serious accident, strong anti-interference performance, there is applications well prospect.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of power cable shelf depreciation analogue system, is characterized in that: comprise impulse generating unit, measuring unit, pulse detection unit and pulse wave transponder,
Described impulse generating unit is arranged on the near-end of power cable, for through near-end from overcoupling to power cable inject driving pulse;
Described measuring unit is arranged on the near-end of power cable, and for measuring, analyzing the pulse location of power cable shelf depreciation, and gating pulse generating unit sends driving pulse;
Described pulse detection unit is arranged on the far-end of power cable, for the driving pulse that received pulse generating unit sends, and notifies pulse wave transponder;
Described pulse wave transponder is arranged on the far-end of power cable, for through far-end from overcoupling to power cable inject echo-pulse;
The control output end of described measuring unit is connected with the driving pulse control input end of impulse generating unit, the driving pulse output terminal of described impulse generating unit is connected with the near-end of power cable by the first HF current transformer, the input end of described measuring unit is connected with the near-end of power cable by the second HF current transformer, the input end of described pulse detection unit is connected with the far-end of power cable by third high frequency current transformer, the output terminal of described pulse detection unit is connected with pulse wave transponder, described pulse wave transponder is connected with the far-end of power cable by the 4th HF current transformer.
Aforesaid a kind of power cable shelf depreciation analogue system, is characterized in that: described measuring unit is also connected with power frequency synchronizer.
Aforesaid a kind of power cable shelf depreciation analogue system, it is characterized in that: described first HF current transformer, the second HF current transformer, third high frequently current transformer, the 4th HF current transformer are protected type HF current transformer, and are socketed on power cable.
Based on the method for testing of above-mentioned power cable shelf depreciation analogue system, it is characterized in that: comprise the following steps,
Step (1), sends driving pulse by measuring unit gating pulse generating unit, and the described driving pulse in the same way near-end of power cable, far-end is propagated;
Step (2), measuring unit receives driving pulse at the near-end of power cable, the far-end of pulse detection unit power cable receives driving pulse, triggers pulse wave transponder and send echo-pulse and feed back to measuring unit after described pulse detection unit receives driving pulse;
Step (3), measuring unit, by the time of arrival of driving pulse, echo-pulse, calculates the length of power cable;
Step (4), when power cable there is partial discharge pulse, the feedback time that measuring unit catches time that partial discharge pulse reaches first, feedback signal is sent to measuring unit by partial discharge pulse through pulse detection unit and pulse wave transponder;
Step (5), the length of the time that measuring unit is reached first by partial discharge pulse, feedback time and power cable, calculates the position of power cable shelf depreciation;
Step (6), measuring unit, by the partial discharge pulse received, carries out characteristic spectrum emulation, sets up pulse database, for identify and the type of pulse is put in judgement office.
The method of testing of aforesaid power cable shelf depreciation analogue system, it is characterized in that: step (6), measuring unit, by the partial discharge pulse received, carries out characteristic spectrum emulation, and the process setting up pulse database is the rise time by partial discharge pulse, fall time, pulse energy, peak value, pulsewidth and dead band, carry out standard format, set up pulse database.
The invention has the beneficial effects as follows: power cable shelf depreciation analogue system of the present invention and method of testing, comprise power cable length to survey, shelf depreciation location, partial discharge pulse, carry out the type that pulse is put in characteristic spectrum emulation, identification and judgement office, by catching the local discharge signal in operation on power cable, the position of local discharge signal detected accurately, find the fault of cable in advance, make prevention, prevent the generation of serious accident, strong anti-interference performance, has applications well prospect.
Accompanying drawing explanation
Fig. 1 is the system chart of power cable shelf depreciation analogue system of the present invention.
Fig. 2 is the process flow diagram of power cable shelf depreciation analogue system measuring method of the present invention.
Embodiment
Below in conjunction with Figure of description, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1, power cable shelf depreciation analogue system of the present invention, comprises impulse generating unit 1, measuring unit 2, pulse detection unit 3 and pulse wave transponder 4,
Described impulse generating unit 1 is arranged on the near-end of power cable, for through the near-end injection driving pulse of overcoupling to power cable, can adopt Portable pulse generator, be convenient for carrying;
Described measuring unit 2 is arranged on the near-end of power cable, and for measuring, analyzing the pulse location of power cable shelf depreciation, and gating pulse generating unit 1 sends driving pulse;
Described pulse detection unit 3 is arranged on the far-end of power cable, for the driving pulse that received pulse generating unit 1 sends, and notifies pulse wave transponder 4;
Described pulse wave transponder 4 is arranged on the far-end of power cable, for through the far-end injection echo-pulse of overcoupling to power cable, can adopt Portable pulse generator, be convenient for carrying;
The control output end of described measuring unit 2 is connected with the driving pulse control input end of impulse generating unit 1, the driving pulse output terminal of described impulse generating unit 1 is connected with the near-end of power cable by the first HF current transformer 5, the input end of described measuring unit 2 is connected with the near-end of power cable by the second HF current transformer 6, the input end of described pulse detection unit 3 is connected with the far-end of power cable by third high frequency current transformer 7, the output terminal of described pulse detection unit 3 is connected with pulse wave transponder 4, described pulse wave transponder 4 is connected with the far-end of power cable by the 4th HF current transformer 8, first HF current transformer 5, second HF current transformer 6, third high is current transformer 7 frequently, 4th HF current transformer 8 is protected type HF current transformer, and be socketed on power cable, coupled pulse signal, described measuring unit 2 is also connected with power frequency synchronizer 9, power frequency synchronizer 9 is for generation of power frequency synchronizing signal, by the synchronism that the driving pulse of measuring unit 2 gating pulse generating unit 1 sends.
Based on the method for testing of above-mentioned power cable shelf depreciation analogue system, as shown in Figure 2, comprise the following steps,
Step (1), sends driving pulse by measuring unit 2 gating pulse generating unit 1, and the described driving pulse in the same way near-end of power cable, far-end is propagated;
Step (2), measuring unit 2 receives driving pulse at the near-end of power cable, the far-end of pulse detection unit 3 power cable receives driving pulse, and pulse detection unit 3 triggers pulse wave transponder 4 and sends echo-pulse and feed back to measuring unit 2 after receiving driving pulse;
Step (3), measuring unit 2, by the time of arrival of driving pulse, echo-pulse, calculates the length of power cable;
Step (4), when power cable occurs in partial discharge pulse, measuring unit 2 catches feedback signal is sent to measuring unit 2 by time that partial discharge pulse reaches first, partial discharge pulse feedback time through pulse detection unit 3 and pulse wave transponder 4;
Step (5), the length of the time that measuring unit 2 is reached first by partial discharge pulse, feedback time and power cable, calculates the position of power cable shelf depreciation;
Step (6), measuring unit 2, by the partial discharge pulse received, carries out characteristic spectrum emulation, by the rise time of partial discharge pulse, fall time, pulse energy, peak value, pulsewidth and dead band, carry out standard format, set up pulse database, as shown in table 1 below, a pulse database table
Table 1 pulse database table
| Non-local office puts | Local office is put | Noise | |
| Frequency range | 100‐4500kHz | 4500‐10000kHz | 0‐100kHz |
| The rise/fall time | 80‐900ns | 0‐80ns | 0 |
| Pulsewidth | 2‐5us | 0‐2us | 0 |
For to identify and the type of pulse is put in judgement office, the type that frequency range, rising, fall time and pulse width characteristic parameter put to the office of identification is put from office, as by frequency range 4500 ?10000kHz, rise, fall time be 0 ?80ns, pulsewidth 0 ?be identified as local office between 2us and put pulse.
In sum, power cable shelf depreciation analogue system of the present invention and method of testing, comprise power cable length and survey, shelf depreciation location, partial discharge pulse, carry out the type that pulse is put in characteristic spectrum emulation, identification and judgement office, by catching the local discharge signal in operation on power cable, the position of local discharge signal being detected accurately, finding the fault of cable in advance, make prevention, prevent the generation of serious accident, strong anti-interference performance, there is applications well prospect.More than show and describe ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. a power cable shelf depreciation analogue system, is characterized in that: comprise impulse generating unit (1), measuring unit (2), pulse detection unit (3) and pulse wave transponder (4),
Described impulse generating unit (1) is arranged on the near-end of power cable, for through near-end from overcoupling to power cable inject driving pulse;
Described measuring unit (2) is arranged on the near-end of power cable, and for measuring, analyzing the pulse location of power cable shelf depreciation, and gating pulse generating unit (1) sends driving pulse;
Described pulse detection unit (3) is arranged on the far-end of power cable, for the driving pulse that received pulse generating unit (1) sends, and notifies pulse wave transponder (4);
Described pulse wave transponder (4) is arranged on the far-end of power cable, for through far-end from overcoupling to power cable inject echo-pulse;
The control output end of described measuring unit (2) is connected with the driving pulse control input end of impulse generating unit (1), the driving pulse output terminal of described impulse generating unit (1) is connected with the near-end of power cable by the first HF current transformer (5), the input end of described measuring unit (2) is connected with the near-end of power cable by the second HF current transformer (6), the input end of described pulse detection unit (3) is connected with the far-end of power cable by third high frequency current transformer (7), the output terminal of described pulse detection unit (3) is connected with pulse wave transponder (4), described pulse wave transponder (4) is connected with the far-end of power cable by the 4th HF current transformer (8).
2. a kind of power cable shelf depreciation analogue system according to claim 1, is characterized in that: described measuring unit (2) is also connected with power frequency synchronizer (9).
3. a kind of power cable shelf depreciation analogue system according to claim 1, it is characterized in that: described first HF current transformer (5), the second HF current transformer (6), third high frequently current transformer (7), the 4th HF current transformer (8) are protected type HF current transformer, and are socketed on power cable.
4., based on the method for testing of power cable shelf depreciation analogue system according to claim 1, it is characterized in that: comprise the following steps,
Step (1), sends driving pulse by measuring unit (2) gating pulse generating unit (1), and the described driving pulse in the same way near-end of power cable, far-end is propagated;
Step (2), measuring unit (2) receives driving pulse at the near-end of power cable, the far-end of pulse detection unit (3) power cable receives driving pulse, triggers pulse wave transponder (4) and send echo-pulse and feed back to measuring unit (2) after described pulse detection unit (3) receives driving pulse;
Step (3), measuring unit (2), by the time of arrival of driving pulse, echo-pulse, calculates the length of power cable;
Step (4), when power cable there is partial discharge pulse, the feedback time that measuring unit (2) catches time that partial discharge pulse reaches first, feedback signal is sent to measuring unit (2) by partial discharge pulse through pulse detection unit (3) and pulse wave transponder (4);
Step (5), the length of the time that measuring unit (2) is reached first by partial discharge pulse, feedback time and power cable, calculates the position of power cable shelf depreciation;
Step (6), measuring unit (2), by the partial discharge pulse received, carries out characteristic spectrum emulation, sets up pulse database, for identify and the type of pulse is put in judgement office.
5. the method for testing of power cable shelf depreciation analogue system according to claim 1, it is characterized in that: step (6), measuring unit (2), by the partial discharge pulse received, carries out characteristic spectrum emulation, and the process setting up pulse database is the rise time by partial discharge pulse, fall time, pulse energy, peak value, pulsewidth and dead band, carry out standard format, set up pulse database.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004973A (en) * | 2015-07-10 | 2015-10-28 | 陕西省地方电力（集团）有限公司 | Dual-end measured overhead insulating wire local discharge positioning system and method |
| CN105353282A (en) * | 2015-11-27 | 2016-02-24 | 国家电网公司 | Transmission characteristic simulation method and system for partial discharge ultrahigh-frequency electromagnetic wave signal of transformer |
| CN109031073A (en) * | 2018-09-04 | 2018-12-18 | 苏州光格设备有限公司 | cable local discharge positioning device and method |
| CN111060788A (en) * | 2019-12-20 | 2020-04-24 | 国网北京市电力公司 | Method and device for analyzing cable insulation defect, storage medium and processor |
| CN112542075A (en) * | 2020-11-30 | 2021-03-23 | 广东电网有限责任公司 | XLPE cable partial discharge simulation method and system |
| CN113791312A (en) * | 2021-08-02 | 2021-12-14 | 深圳供电局有限公司 | Cable insulation evaluation system and method with accurate positioning function |
| CN115856525A (en) * | 2022-11-08 | 2023-03-28 | 武汉朗德电气有限公司 | Cable partial discharge online monitoring method and system |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0611534A (en) * | 1992-06-26 | 1994-01-21 | Hitachi Cable Ltd | Partial discharge measuring method |
| JP2001133507A (en) * | 1999-11-08 | 2001-05-18 | Sumitomo Electric Ind Ltd | Method and device for determining partial discharge noise |
| CN201628754U (en) * | 2010-02-08 | 2010-11-10 | 湖北省电力试验研究院 | Wideband partial discharge detection device for power equipment |
| CN102288883A (en) * | 2011-08-30 | 2011-12-21 | 华南理工大学 | Oscillation wave partial discharge identifying and positioning method for asynchronous double-end power cable |
| CN102435924A (en) * | 2011-10-31 | 2012-05-02 | 广东电网公司广州供电局 | Automatic positioning method and system for cable local discharge single end of OWTS (Oscillating Wave Test System) detection device |
| CN102565634A (en) * | 2012-01-10 | 2012-07-11 | 广东电网公司电力科学研究院 | Power cable fault location method based on transfer function method |
| CN102890227A (en) * | 2012-09-29 | 2013-01-23 | 深圳供电局有限公司 | Intelligent 10kV distribution cable partial discharge on-line monitoring device |
| CN103076545A (en) * | 2012-12-31 | 2013-05-01 | 广州供电局有限公司 | Electrified length measurement and local discharge detection and positioning simulation system for high voltage cable |
| CN103344891A (en) * | 2013-07-10 | 2013-10-09 | 苏州光格设备有限公司 | Method and device for locating partial discharge of high voltage cable |
| CN103558514A (en) * | 2013-10-10 | 2014-02-05 | 广东电网公司惠州供电局 | Double-end cable oscillatory wave partial discharge locating system and method based on pulse injection |
| CN104155583A (en) * | 2013-09-26 | 2014-11-19 | 扬州市交大工业技术研究院有限公司 | High-voltage single-core power cable partial discharge online monitoring method and system |
-
2015
- 2015-01-29 CN CN201510044358.9A patent/CN104569769A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0611534A (en) * | 1992-06-26 | 1994-01-21 | Hitachi Cable Ltd | Partial discharge measuring method |
| JP2001133507A (en) * | 1999-11-08 | 2001-05-18 | Sumitomo Electric Ind Ltd | Method and device for determining partial discharge noise |
| CN201628754U (en) * | 2010-02-08 | 2010-11-10 | 湖北省电力试验研究院 | Wideband partial discharge detection device for power equipment |
| CN102288883A (en) * | 2011-08-30 | 2011-12-21 | 华南理工大学 | Oscillation wave partial discharge identifying and positioning method for asynchronous double-end power cable |
| CN102435924A (en) * | 2011-10-31 | 2012-05-02 | 广东电网公司广州供电局 | Automatic positioning method and system for cable local discharge single end of OWTS (Oscillating Wave Test System) detection device |
| CN102565634A (en) * | 2012-01-10 | 2012-07-11 | 广东电网公司电力科学研究院 | Power cable fault location method based on transfer function method |
| CN102890227A (en) * | 2012-09-29 | 2013-01-23 | 深圳供电局有限公司 | Intelligent 10kV distribution cable partial discharge on-line monitoring device |
| CN103076545A (en) * | 2012-12-31 | 2013-05-01 | 广州供电局有限公司 | Electrified length measurement and local discharge detection and positioning simulation system for high voltage cable |
| CN103344891A (en) * | 2013-07-10 | 2013-10-09 | 苏州光格设备有限公司 | Method and device for locating partial discharge of high voltage cable |
| CN104155583A (en) * | 2013-09-26 | 2014-11-19 | 扬州市交大工业技术研究院有限公司 | High-voltage single-core power cable partial discharge online monitoring method and system |
| CN103558514A (en) * | 2013-10-10 | 2014-02-05 | 广东电网公司惠州供电局 | Double-end cable oscillatory wave partial discharge locating system and method based on pulse injection |
Non-Patent Citations (1)
| Title |
|---|
| 苏燕民: "基于低压脉冲法和脉冲电流法的电缆故障测距分析", 《电线电缆》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004973A (en) * | 2015-07-10 | 2015-10-28 | 陕西省地方电力（集团）有限公司 | Dual-end measured overhead insulating wire local discharge positioning system and method |
| CN105004973B (en) * | 2015-07-10 | 2018-05-25 | 陕西省地方电力（集团）有限公司 | Double-end measurement aerial insulated wire shelf depreciation alignment system and method |
| CN105353282A (en) * | 2015-11-27 | 2016-02-24 | 国家电网公司 | Transmission characteristic simulation method and system for partial discharge ultrahigh-frequency electromagnetic wave signal of transformer |
| CN109031073A (en) * | 2018-09-04 | 2018-12-18 | 苏州光格设备有限公司 | cable local discharge positioning device and method |
| CN111060788A (en) * | 2019-12-20 | 2020-04-24 | 国网北京市电力公司 | Method and device for analyzing cable insulation defect, storage medium and processor |
| CN112542075A (en) * | 2020-11-30 | 2021-03-23 | 广东电网有限责任公司 | XLPE cable partial discharge simulation method and system |
| CN113791312A (en) * | 2021-08-02 | 2021-12-14 | 深圳供电局有限公司 | Cable insulation evaluation system and method with accurate positioning function |
| CN115856525A (en) * | 2022-11-08 | 2023-03-28 | 武汉朗德电气有限公司 | Cable partial discharge online monitoring method and system |
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