CN101968524A - Division test method and tester for multi-point grounding of common loop - Google Patents
Division test method and tester for multi-point grounding of common loop Download PDFInfo
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- CN101968524A CN101968524A CN 201010297553 CN201010297553A CN101968524A CN 101968524 A CN101968524 A CN 101968524A CN 201010297553 CN201010297553 CN 201010297553 CN 201010297553 A CN201010297553 A CN 201010297553A CN 101968524 A CN101968524 A CN 101968524A
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Abstract
The invention discloses a test method and tester for multi-point grounding of a common loop. The invention has the following beneficial effects: connecting a constant-current source and an alternating current ammeter in parallel between an N wire to be tested and a ground point and using a clip-on ammeter to measure the branch current of the N wire to be tested and the ground point to change the current value of the constant-current source and comparing the current of the alternating current ammeter I1 with the current of the clip-on ammeter I2 to judge whether the N wire to be tested undergoes multi-point grounding. The method and the tester can directly detect whether the common loop undergoes multi-point grounding without exiting from the original ground point, and are simple and convenient to operate and friendly and intuitive in interface. The method and the tester can be widely applied to power field operation and detection.
Description
Technical field
The present invention relates to a kind of method of testing of common return multipoint earthing.The invention still further relates to a kind of common return multipoint earthing tester.
Background technology
The conventional means of investigation PT secondary circuit multipoint earthing is by the test of PT secondary voltage drop and two kinds of approach of N line zero sequence current measurement at present.Because the field staff does not have specialized equipment and judges; whether multipoint earthing takes place and searches all very difficult; and the hidden danger of secondary circuit multipoint earthing has incorrect and measuring apparatus inaccurate of burning screen layer, causing protective device action; even cause the great risk of large area blackout; happen occasionally in the actual electric network accident that causes owing to the secondary circuit multipoint earthing in service, so the field personnel is badly in need of a kind of device that can conveniently detect the secondary circuit multipoint earthing.
Summary of the invention
In order to solve the problems of the technologies described above, the objective of the invention is: improve the method for testing of traditional test of PT secondary voltage drop and the test of N line zero-sequence current, a kind of constant current shunting detection method is provided.
Another object of the present invention is: a kind of tester that can conveniently detect the common return multipoint earthing is provided.
The technical scheme that the present invention is adopted for its technical matters of solution is:
A kind of common return multipoint earthing shunting method of testing, it may further comprise the steps:
A. the branch road that a continuous current source in parallel and alternating current ammeter compose in series between tested N line and earth point;
B. on tested N line, connect a clamp on amperemeter, measure the electric current of this N line branch road;
C. open the continuous current source, regulate constant current source output current size, record alternating current ammeter current value I 1 and clamp on amperemeter current value I 2;
D. compare the size of alternating current ammeter current value I 1 and clamp on amperemeter current value I 2, less than I1, then this N line of decidable has or multipoint earthing phenomenon at 2 as if I2; If I2 equals I1, then this N line of decidable is an one point earth.
Be further used as preferred embodiment, the variation range in described continuous current source is 0 ~ 0.2A.
A kind of common return multipoint earthing shunting tester, comprise a constant-current supply, this constant-current supply is connected with an alternating current ammeter, described continuous current source and alternating current ammeter are connected in parallel between tested N line and the earth point, and described shunting tester comprises that also one can be connected on the clamp on amperemeter between tested N line and earth point.
Be further used as preferred embodiment, this constant current divides flow detection device also to comprise an Intelligent Recognition control system and shows LCD, described alternating current ammeter and clamp on amperemeter current signal are imported this Intelligent Recognition control system, this Intelligent Recognition control system output terminal is connected with the input end that shows LCD, this Intelligent Recognition control system is gathered detecting the current information of surveying, judge by built-in pattern match whether system has the multipoint earthing phenomenon, and can show by LCD.
Be further used as preferred embodiment, the variation range in described continuous current source is 0 ~ 0.2A.
The invention has the beneficial effects as follows: the inventive method is not withdrawing under the former earth point situation of tested N line, between tested N line and earth point, incorporate a constant-current supply and alternating current ammeter into, and measure the branch current of tested N line and earth point branch road with clamp on amperemeter, change continuous current source current value size, can judge automatically by detecting the current information collection whether this common return exists multipoint earthing.The present invention provides a kind of reliable method, facility simple to operate for detecting the common return multipoint earthing.
Another beneficial effect of the present invention is: tester of the present invention provides a kind of light and handy easy testing tool for detecting the common return multipoint earthing, and simple to operation, friendly interface is directly perceived.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing:
Fig. 1 is that the shunting multipoint earthing detects schematic diagram.
Embodiment
In conjunction with shown in Figure 1, a kind of common return multipoint earthing shunting method of testing, it may further comprise the steps:
A. the branch road that a continuous current source 1 in parallel and alternating current ammeter 2 compose in series between tested N line 4 and earth point A, B;
B. on tested N line 4, connect a clamp on amperemeter 3, measure the electric current of this N line branch road;
C. open continuous current source 1, regulate constant current source output current size, record alternating current ammeter electric current I 1 and clamp on amperemeter electric current I 2;
D. the size that compares alternating current ammeter electric current I 1 and clamp on amperemeter electric current I 2 is if clamp on amperemeter electric current I 2＜alternating current ammeter electric current I 1 illustrates to have multipoint earthing and by-pass current I3 that then this N line of decidable has or multipoint earthing phenomenon at 2; If clamp on amperemeter electric current I 2=alternating current ammeter electric current I 1 illustrates that this common return only has a loop, then this N line of decidable is an one point earth.
Be further used as preferred embodiment, the variation range in described continuous current source 1 is 0 ~ 0.2A.
A kind of common return multipoint earthing shunting tester, comprise a continuous current source 1, connect with an alternating current ammeter 2 in this continuous current source 1, described continuous current source 1 and alternating current ammeter 2 are connected in parallel between tested N line 4 and the earth point, and described shunting tester comprises that also one can be connected on the clamp on amperemeter 3 between tested N line 4 and earth point.
Be further used as preferred embodiment, this shunting tester also comprises an Intelligent Recognition control system and shows LCD, described alternating current ammeter 2 and clamp on amperemeter 3 current signals are imported this Intelligent Recognition control system, this Intelligent Recognition control system output terminal is connected with the input end that shows LCD, this Intelligent Recognition control system is gathered the current information that detects, judge by built-in pattern match whether system has the multipoint earthing phenomenon, and show by LCD whether detecting pattern, size of current, multipoint earthing wait information.
Be further used as preferred embodiment, the variation range in described continuous current source 1 is 0 ~ 0.2A.
More than be that preferable enforcement of the present invention is specified, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite of spirit of the present invention, distortion that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (5)
1. the common return multipoint earthing is shunted method of testing, and it is characterized in that: it may further comprise the steps:
A. the branch road that a continuous current source (1) in parallel and alternating current ammeter (2) compose in series between tested N line (4) and earth point;
B. go up connection one clamp on amperemeter (3) at tested N line (4), measure the electric current of this N line branch road;
C. open continuous current source (1), regulate constant current source output current size, record alternating current ammeter electric current (I1) and clamp on amperemeter electric current (I2);
D. compare the size of alternating current ammeter electric current (I1) and clamp on amperemeter electric current (I2), less than alternating current ammeter electric current (I1), then this N line of decidable has or multipoint earthing phenomenon at 2 as if clamp on amperemeter electric current (I2); If clamp on amperemeter electric current (I2) equals alternating current ammeter electric current (I1), then this N line of decidable is an one point earth.
2. common return multipoint earthing shunting method of testing according to claim 1 is characterized in that:
The variation range in described continuous current source (1) is 0 ~ 0.2A.
3. the common return multipoint earthing is shunted tester, it is characterized in that: comprise a continuous current source (1), connect with an alternating current ammeter (2) in this continuous current source (1), described continuous current source (1) and alternating current ammeter (2) are connected in parallel between tested N line (4) and the earth point, and described shunting tester comprises that also one can be connected on the clamp on amperemeter (3) between tested N line (4) and earth point.
4. common return multipoint earthing shunting tester according to claim 3, it is characterized in that: this shunting tester also comprises an Intelligent Recognition control system and shows LCD, described alternating current ammeter (2) and clamp on amperemeter (3) current signal are imported this Intelligent Recognition control system, and this Intelligent Recognition control system output terminal is connected with the input end that shows LCD.
5. according to claim 3 or 4 described common return multipoint earthing shunting testers, it is characterized in that: the variation range in described continuous current source (1) is 0 ~ 0.2A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010297553 CN101968524A (en) | 2010-09-30 | 2010-09-30 | Division test method and tester for multi-point grounding of common loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010297553 CN101968524A (en) | 2010-09-30 | 2010-09-30 | Division test method and tester for multi-point grounding of common loop |
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| CN101968524A true CN101968524A (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010297553 Pending CN101968524A (en) | 2010-09-30 | 2010-09-30 | Division test method and tester for multi-point grounding of common loop |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197195A (en) * | 2013-03-29 | 2013-07-10 | 国家电网公司 | Detecting method and detecting system for multipoint earthing of voltage second loop neutral conductor network |
| CN103605041A (en) * | 2013-11-14 | 2014-02-26 | 国家电网公司 | Non-contact multi-point grounding detection method and system for secondary circuit of current transformer |
| CN103983895A (en) * | 2014-04-08 | 2014-08-13 | 广西电网公司电力科学研究院 | PT secondary circuit online N-line multipoint ground fault detection method and device |
| CN105589004A (en) * | 2014-10-13 | 2016-05-18 | 国家电网公司 | Method and device for judging substation relay protection-used PT secondary common circuit single-point grounding |
| CN106772192A (en) * | 2016-12-12 | 2017-05-31 | 国家电网公司 | Secondary Circuit of Potential Transformer multipoint earthing detection means |
| CN107957568A (en) * | 2017-11-23 | 2018-04-24 | 中国南方电网有限责任公司超高压输电公司柳州局 | Secondary Circuit of Potential Transformer multipoint earthing Quick positioning instrument and lookup method |
| CN109307817A (en) * | 2018-10-24 | 2019-02-05 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of cable electrification identifier and recognition methods |
| CN114325114A (en) * | 2021-11-29 | 2022-04-12 | 云南电网有限责任公司昆明供电局 | Double-end grounding loop resistance testing method of disassembly-free grounding wire |
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| JPS55159162A (en) * | 1979-05-31 | 1980-12-11 | Seikou Denki Seisakusho:Kk | Direct current grounding detector |
| CN201184891Y (en) * | 2008-01-11 | 2009-01-21 | 俞盛荣 | Detection module for short/open circuit of current mutual inductor secondary circuit |
| CN101726687A (en) * | 2009-12-10 | 2010-06-09 | 贵州电力试验研究院 | Method for monitoring one-point grounding of secondary neutral point of voltage transformer between transformer substation and power plant |
| CN201569718U (en) * | 2009-11-27 | 2010-09-01 | 山西晋能电力科技有限公司 | On-line monitoring device for two-point earthing of AC voltage and current secondary loop |
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2010
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| JPS55159162A (en) * | 1979-05-31 | 1980-12-11 | Seikou Denki Seisakusho:Kk | Direct current grounding detector |
| CN201184891Y (en) * | 2008-01-11 | 2009-01-21 | 俞盛荣 | Detection module for short/open circuit of current mutual inductor secondary circuit |
| CN201569718U (en) * | 2009-11-27 | 2010-09-01 | 山西晋能电力科技有限公司 | On-line monitoring device for two-point earthing of AC voltage and current secondary loop |
| CN101726687A (en) * | 2009-12-10 | 2010-06-09 | 贵州电力试验研究院 | Method for monitoring one-point grounding of secondary neutral point of voltage transformer between transformer substation and power plant |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197195A (en) * | 2013-03-29 | 2013-07-10 | 国家电网公司 | Detecting method and detecting system for multipoint earthing of voltage second loop neutral conductor network |
| CN103605041A (en) * | 2013-11-14 | 2014-02-26 | 国家电网公司 | Non-contact multi-point grounding detection method and system for secondary circuit of current transformer |
| CN103605041B (en) * | 2013-11-14 | 2017-01-18 | 国家电网公司 | Non-contact multi-point grounding detection method and system for secondary circuit of current transformer |
| CN103983895A (en) * | 2014-04-08 | 2014-08-13 | 广西电网公司电力科学研究院 | PT secondary circuit online N-line multipoint ground fault detection method and device |
| CN103983895B (en) * | 2014-04-08 | 2016-08-17 | 广西电网公司电力科学研究院 | The online N line multipoint earth faults detection method of PT secondary circuit |
| CN105589004A (en) * | 2014-10-13 | 2016-05-18 | 国家电网公司 | Method and device for judging substation relay protection-used PT secondary common circuit single-point grounding |
| CN106772192A (en) * | 2016-12-12 | 2017-05-31 | 国家电网公司 | Secondary Circuit of Potential Transformer multipoint earthing detection means |
| CN107957568A (en) * | 2017-11-23 | 2018-04-24 | 中国南方电网有限责任公司超高压输电公司柳州局 | Secondary Circuit of Potential Transformer multipoint earthing Quick positioning instrument and lookup method |
| CN109307817A (en) * | 2018-10-24 | 2019-02-05 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of cable electrification identifier and recognition methods |
| CN109307817B (en) * | 2018-10-24 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司柳州局 | Cable live identification instrument and identification method |
| CN114325114A (en) * | 2021-11-29 | 2022-04-12 | 云南电网有限责任公司昆明供电局 | Double-end grounding loop resistance testing method of disassembly-free grounding wire |
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Application publication date: 20110209 |