CN104655995A - Dual-end positioning method for partial discharge source of power cable - Google Patents
Dual-end positioning method for partial discharge source of power cable Download PDFInfo
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- CN104655995A CN104655995A CN201510043934.8A CN201510043934A CN104655995A CN 104655995 A CN104655995 A CN 104655995A CN 201510043934 A CN201510043934 A CN 201510043934A CN 104655995 A CN104655995 A CN 104655995A
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Abstract
The invention discloses a dual-end positioning method for a partial discharge source of a power cable. When the power cable is longer, a measurement unit is arranged at the near end of the power cable, and a triggering reflection unit is arranged at the far end of the power cable; a partial discharge signal sent by the partial discharge source firstly reaches the measurement unit at the near end, and when the triggering reflection unit receives a partial discharge pulse through a high-frequency cable transformer, the pulse signal is sent to a signal emission module for amplification, then is sent to the cable through another high-frequency cable transformer and is transmitted to the measurement end; by measurement of the difference of the arrival of time of the partial discharge pulse and the amplified partial discharge pulse, the partial discharge source is positioned; by enhancement of the reflected partial discharge pulse, the positioning precision is greatly improved, and the dual-end positioning method has a good application prospect.
Description
Technical field
The present invention relates to a kind of power cable office and put source both-end localization method, 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 power cable, manufacture and application and has developed rapidly.At present, it is single-ended location that source electricity method is put in power cable office, namely gathers direct impulse and the reflected impulse of the Partial discharge signal of cable inside in cable side, obtain the interval time between forward and reverse impulse, thus striking out can be calculated put the distance of source from check point, but, single-ended assignment test mode, orientation distance is shorter, and, because site environment is complicated, disturb larger, there will be that reflected impulse is faint not easily to be detected, location difficulty and precision is not high.
Summary of the invention
Object of the present invention overcomes existing power cable office and puts the single-ended assignment test mode in source, and orientation distance is shorter, and interference free performance is low, and reflected impulse is faint not easily to be detected, location difficulty and the not high problem of precision.Source both-end localization method is put in power cable office of the present invention, when power cable is longer, measuring unit is arranged on the near-end of power cable, trigger the far-end that reflector element is arranged on power cable, the Partial discharge signal that the office source of putting sends, first the measuring unit of near-end is reached, when triggering reflector element puts pulse by the high frequency cable mutual inductor office of receiving simultaneously, pulse signal is sent to signal emission module amplify, and be sent to cable by another one high frequency cable mutual inductor, and be transferred to measuring junction, pulse is put by survey bureau, office after amplification put pulse to reach the mistiming poor, the position in source is put in location office, pulse is put by the office strengthening reflection, increase considerably positioning precision, have a good application prospect.
In order to achieve the above object, the technical solution adopted in the present invention is:
Source both-end localization method is put in a kind of power cable office, it is characterized in that: comprise the following steps,
Step (1), is socketed in the near-end of power cable by the first HF current transformer, its signal output part is connected with measuring unit, and described measuring unit is connected with power frequency synchronizer;
Step (2), second, third HF current transformer is socketed in respectively the far-end of power cable, the signal output part of described second HF current transformer is connected with triggering reflector element, and the output terminal of described triggering reflector element is connected with third high frequency current transformer;
Step (3), sends driving pulse by measuring unit, and the far-end to power cable is propagated, the moment T that record sends;
Step (4), trigger reflector element and receive driving pulse at the far-end of power cable, enter to identify to driving pulse, and after shaping amplification, sent to the measuring unit of near-end by the driving pulse of third high frequency current transformer after amplifying, the time that driving pulse is amplified in the identification of triggering reflector element, shaping is T2;
Step (5), measuring unit receives the driving pulse after amplifying by the first HF current transformer, and records due in T
', the time TL of electric signal transmission whole piece cable is (T
' _t-T2)/2, then the length L=TL*V of whole piece cable, wherein, V electric signal is in the velocity of propagation of electric signal at power cable;
Step (6), when pulse is put in the power cable office of sending, respectively to near-end, the far-end propagation of power cable;
Step (7), the measuring unit being positioned at near-end puts pulse by the first HF current transformer office of acceptance, and records due in T1;
Step (8), the triggering reflector element being positioned at far-end puts pulse by the second HF current transformer office of acceptance, play a game put pulse enter identify, and after shaping amplification, by third high frequently the office of current transformer after amplifying put the measuring unit that pulse sends to near-end, trigger the identification of reflector element, time that pulse is put in shaping amplification office be T2;
Step (9), the measuring unit being positioned at near-end receives the office after amplifying by the first HF current transformer and puts pulse, and records due in T3, and the mistiming that reaches that pulse is put in the office after pulse, amplification are put in office is Td=T3-T1;
Step (10), it is Ta that the office of order puts between measuring unit that pulse is sent to near-end, and the time being sent to the triggering reflector element of far-end is Tb, then
Td= TL+T2+Tb-Ta （1）
Wherein, TL=Ta+Tb, then
Td=T a+Tb+T2+Tb-Ta=2 Tb+T2 （2）
That is,
2Tb= T3-T1+T2 （3）；
Step (11), according to formula (4), ratio K is put in the office that source is put in calculating power cable office,
K= Tb/ TL （4）
After formula (3) is substituted into, K=(T3-T1+T2) * V/ (2 L);
Step (12), the distance b=L*K of source to the triggering reflector element of far-end is put in office; The distance a=L*(1-K of source to the measuring unit of near-end is put in office).
Source both-end localization method is put in aforesaid a kind of power cable office, it is characterized in that: step (1), and the synchronism of pulse is put in the office after described power frequency synchronizer puts pulse, amplification for measuring unit collection office.
Source both-end localization method is put in aforesaid a kind of power cable office, it is characterized in that: described triggering reflector element comprises trigger action module and signal emission module, described trigger action module is the detection trigger that pulse is put in office, and described signal emission module is Portable pulse generator.
The invention has the beneficial effects as follows: source both-end localization method is put in power cable office of the present invention, when power cable is longer, measuring unit is arranged on the near-end of power cable, trigger the far-end that reflector element is arranged on power cable, the Partial discharge signal that the office source of putting sends, first the measuring unit of near-end is reached, when triggering reflector element puts pulse by the high frequency cable mutual inductor office of receiving simultaneously, pulse signal is sent to signal emission module amplify, and be sent to cable by another one high frequency cable mutual inductor, and be transferred to measuring junction, pulse is put by survey bureau, office after amplification put pulse to reach the mistiming poor, the position in source is put in location office, pulse is put by the office strengthening reflection, increase considerably positioning precision, have a good application prospect.
Accompanying drawing explanation
Fig. 1 is the process flow diagram that source both-end localization method is put in power cable office 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, source both-end localization method is put in power cable office of the present invention, comprises the following steps,
Step (1), is socketed in the near-end of power cable by the first HF current transformer, its signal output part is connected with measuring unit, and described measuring unit is connected with power frequency synchronizer;
Step (2), second, third HF current transformer is socketed in respectively the far-end of power cable, the signal output part of described second HF current transformer is connected with triggering reflector element, and the output terminal of described triggering reflector element is connected with third high frequency current transformer;
Step (3), sends driving pulse by measuring unit, and the far-end to power cable is propagated, the moment T that record sends;
Step (4), trigger reflector element and receive driving pulse at the far-end of power cable, enter to identify to driving pulse, and after shaping amplification, sent to the measuring unit of near-end by the driving pulse of third high frequency current transformer after amplifying, the time that driving pulse is amplified in the identification of triggering reflector element, shaping is T2;
Step (5), measuring unit receives the driving pulse after amplifying by the first HF current transformer, and records due in T
', the time TL of electric signal transmission whole piece cable is (T
' _t-T2)/2, then the length L=TL*V of whole piece cable, wherein, V electric signal is in the velocity of propagation of electric signal at power cable;
Step (6), when pulse is put in the power cable office of sending, respectively to near-end, the far-end propagation of power cable;
Step (7), the measuring unit being positioned at near-end puts pulse by the first HF current transformer office of acceptance, and records due in T1;
Step (8), the triggering reflector element being positioned at far-end puts pulse by the second HF current transformer office of acceptance, play a game put pulse enter identify, and after shaping amplification, by third high frequently the office of current transformer after amplifying put the measuring unit that pulse sends to near-end, trigger the identification of reflector element, time that pulse is put in shaping amplification office be T2;
Step (9), the measuring unit being positioned at near-end receives the office after amplifying by the first HF current transformer and puts pulse, and records due in T3, and the mistiming that reaches that pulse is put in the office after pulse, amplification are put in office is Td=T3-T1;
Step (10), it is Ta that the office of order puts between measuring unit that pulse is sent to near-end, and the time being sent to the triggering reflector element of far-end is Tb, then
Td= TL+T2+Tb-Ta （1）
Wherein, TL=Ta+Tb, then
Td=T a+Tb+T2+Tb-Ta=2 Tb+T2 （2）
That is,
2Tb= T3-T1+T2 （3）；
Step (11), according to formula (4), ratio K is put in the office that source is put in calculating power cable office,
K= Tb/ TL （4）
After formula (3) is substituted into, K=(T3-T1+T2) * V/ (2 L);
Step (12), the distance b=L*K of source to the triggering reflector element of far-end is put in office; The distance a=L*(1-K of source to the measuring unit of near-end is put in office).
The synchronism of pulse is put in office after described power frequency synchronizer puts pulse, amplification for measuring unit collection office, described triggering reflector element comprises trigger action module and signal emission module, trigger action module is the detection trigger that pulse is put in office, signal emission module is Portable pulse generator, is easy to carry.
In sum, source both-end localization method is put in power cable office of the present invention, when power cable is longer, measuring unit is arranged on the near-end of power cable, trigger the far-end that reflector element is arranged on power cable, the Partial discharge signal that the office source of putting sends, first the measuring unit of near-end is reached, when triggering reflector element puts pulse by the high frequency cable mutual inductor office of receiving simultaneously, pulse signal is sent to signal emission module amplify, and be sent to cable by another one high frequency cable mutual inductor, and be transferred to measuring junction, pulse is put by survey bureau, office after amplification put pulse to reach the mistiming poor, the position in source is put in location office, pulse is put by the office strengthening reflection, increase considerably positioning precision, have a good application 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 (3)
1. a source both-end localization method is put in power cable office, it is characterized in that: comprise the following steps,
Step (1), is socketed in the near-end of power cable by the first HF current transformer, its signal output part is connected with measuring unit, and described measuring unit is connected with power frequency synchronizer;
Step (2), second, third HF current transformer is socketed in respectively the far-end of power cable, the signal output part of described second HF current transformer is connected with triggering reflector element, and the output terminal of described triggering reflector element is connected with third high frequency current transformer;
Step (3), sends driving pulse by measuring unit, and the far-end to power cable is propagated, the moment T that record sends;
Step (4), trigger reflector element and receive driving pulse at the far-end of power cable, enter to identify to driving pulse, and after shaping amplification, sent to the measuring unit of near-end by the driving pulse of third high frequency current transformer after amplifying, the time that driving pulse is amplified in the identification of triggering reflector element, shaping is T2;
Step (5), measuring unit receives the driving pulse after amplifying by the first HF current transformer, and records due in T
', the time TL of electric signal transmission whole piece cable is (T
' _t-T2)/2, then the length L=TL*V of whole piece cable, wherein, V electric signal is in the velocity of propagation of electric signal at power cable;
Step (6), when pulse is put in the power cable office of sending, respectively to near-end, the far-end propagation of power cable;
Step (7), the measuring unit being positioned at near-end puts pulse by the first HF current transformer office of acceptance, and records due in T1;
Step (8), the triggering reflector element being positioned at far-end puts pulse by the second HF current transformer office of acceptance, play a game put pulse enter identify, and after shaping amplification, by third high frequently the office of current transformer after amplifying put the measuring unit that pulse sends to near-end, trigger the identification of reflector element, time that pulse is put in shaping amplification office be T2;
Step (9), the measuring unit being positioned at near-end receives the office after amplifying by the first HF current transformer and puts pulse, and records due in T3, and the mistiming that reaches that pulse is put in the office after pulse, amplification are put in office is Td=T3-T1;
Step (10), it is Ta that the office of order puts between measuring unit that pulse is sent to near-end, and the time being sent to the triggering reflector element of far-end is Tb, then
Td= TL+T2+Tb-Ta （1）
Wherein, TL=Ta+Tb, then
Td=T a+Tb+T2+Tb-Ta=2 Tb+T2 （2）
That is,
2Tb= T3-T1+T2 （3）；
Step (11), according to formula (4), ratio K is put in the office that source is put in calculating power cable office,
K= Tb/ TL （4）
After formula (3) is substituted into, K=(T3-T1+T2) * V/ (2 L);
Step (12), the distance b=L*K of source to the triggering reflector element of far-end is put in office; The distance a=L*(1-K of source to the measuring unit of near-end is put in office).
2. source both-end localization method is put in a kind of power cable office according to claim 1, it is characterized in that: step (1), and the synchronism of pulse is put in the office after described power frequency synchronizer puts pulse, amplification for measuring unit collection office.
3. source both-end localization method is put in a kind of power cable office according to claim 1, it is characterized in that: described triggering reflector element comprises trigger action module and signal emission module, described trigger action module is the detection trigger that pulse is put in office, and described signal emission module is Portable pulse generator.
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| CN201510043934.8A CN104655995A (en) | 2015-01-29 | 2015-01-29 | Dual-end positioning method for partial discharge source of power cable |
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Cited By (9)
| 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 |
| CN105866636A (en) * | 2016-03-23 | 2016-08-17 | 国家电网公司 | Transformer substation positioning method based on time difference positioning |
| CN106353655A (en) * | 2016-10-28 | 2017-01-25 | 西安浩能电气科技有限公司 | Characteristic pulse generating device for power cable partial discharge double-ended location as well as system and method thereof |
| CN107167712A (en) * | 2017-06-01 | 2017-09-15 | 贵州电网有限责任公司 | A kind of power cable partial discharge synchronous collection method and system based on GPS |
| CN108152666A (en) * | 2017-11-27 | 2018-06-12 | 国网北京市电力公司 | The method and system of cable local discharge detection |
| CN110244203A (en) * | 2019-06-24 | 2019-09-17 | 深圳供电局有限公司 | Partial discharge detecting system and partial discharge detection device |
| CN110940896A (en) * | 2019-12-19 | 2020-03-31 | 苏州裕太车通电子科技有限公司 | Damage diagnosis method for ultra-long cable |
| CN111781474A (en) * | 2020-08-05 | 2020-10-16 | 广东电网有限责任公司 | Time-synchronous partial discharge double-end positioning device and method thereof |
| CN114814493A (en) * | 2022-04-22 | 2022-07-29 | 华北电力大学 | Four-segment type cable partial discharge source double-end monitoring and positioning method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0611534A (en) * | 1992-06-26 | 1994-01-21 | Hitachi Cable Ltd | Partial discharge measuring method |
| EP2437075A1 (en) * | 2010-10-01 | 2012-04-04 | Locamation B.V. | Locating partial discharge in a power cable |
| CN102426323A (en) * | 2011-10-31 | 2012-04-25 | 广东电网公司广州供电局 | Method and device for calculating time difference between incident wave and reflected wave in traveling wave method positioning |
| CN102565637A (en) * | 2011-12-12 | 2012-07-11 | 广东电网公司电力科学研究院 | Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement |
| 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 |
| 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 |
| CN104316849A (en) * | 2014-10-20 | 2015-01-28 | 国网吉林省电力有限公司长春供电公司 | Double-end measurement based high-voltage cable partial discharge on-line monitoring system |
-
2015
- 2015-01-29 CN CN201510043934.8A patent/CN104655995A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0611534A (en) * | 1992-06-26 | 1994-01-21 | Hitachi Cable Ltd | Partial discharge measuring method |
| EP2437075A1 (en) * | 2010-10-01 | 2012-04-04 | Locamation B.V. | Locating partial discharge in a power cable |
| CN102426323A (en) * | 2011-10-31 | 2012-04-25 | 广东电网公司广州供电局 | Method and device for calculating time difference between incident wave and reflected wave in traveling wave method positioning |
| CN102565637A (en) * | 2011-12-12 | 2012-07-11 | 广东电网公司电力科学研究院 | Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement |
| 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 |
| 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 |
| CN104316849A (en) * | 2014-10-20 | 2015-01-28 | 国网吉林省电力有限公司长春供电公司 | Double-end measurement based high-voltage cable partial discharge on-line monitoring system |
Cited By (12)
| 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 |
| CN105866636A (en) * | 2016-03-23 | 2016-08-17 | 国家电网公司 | Transformer substation positioning method based on time difference positioning |
| CN105866636B (en) * | 2016-03-23 | 2018-09-11 | 国家电网公司 | Transformer substation positioning method based on time difference positioning |
| CN106353655A (en) * | 2016-10-28 | 2017-01-25 | 西安浩能电气科技有限公司 | Characteristic pulse generating device for power cable partial discharge double-ended location as well as system and method thereof |
| CN107167712A (en) * | 2017-06-01 | 2017-09-15 | 贵州电网有限责任公司 | A kind of power cable partial discharge synchronous collection method and system based on GPS |
| CN108152666A (en) * | 2017-11-27 | 2018-06-12 | 国网北京市电力公司 | The method and system of cable local discharge detection |
| CN110244203A (en) * | 2019-06-24 | 2019-09-17 | 深圳供电局有限公司 | Partial discharge detecting system and partial discharge detection device |
| CN110244203B (en) * | 2019-06-24 | 2022-03-01 | 深圳供电局有限公司 | Partial discharge detection system and partial discharge detection device |
| CN110940896A (en) * | 2019-12-19 | 2020-03-31 | 苏州裕太车通电子科技有限公司 | Damage diagnosis method for ultra-long cable |
| CN111781474A (en) * | 2020-08-05 | 2020-10-16 | 广东电网有限责任公司 | Time-synchronous partial discharge double-end positioning device and method thereof |
| CN114814493A (en) * | 2022-04-22 | 2022-07-29 | 华北电力大学 | Four-segment type cable partial discharge source double-end monitoring and positioning method |
| CN114814493B (en) * | 2022-04-22 | 2022-12-20 | 华北电力大学 | Four-segment type cable partial discharge source double-end monitoring and positioning method |
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