CN202002994U - Electric-loop grounding-fault rapid tester - Google Patents
Electric-loop grounding-fault rapid tester Download PDFInfo
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- CN202002994U CN202002994U CN2011200598271U CN201120059827U CN202002994U CN 202002994 U CN202002994 U CN 202002994U CN 2011200598271 U CN2011200598271 U CN 2011200598271U CN 201120059827 U CN201120059827 U CN 201120059827U CN 202002994 U CN202002994 U CN 202002994U
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Abstract
The utility model relates to an electric-loop grounding-fault rapid tester, which is characterized by comprising a first current sensor, a second current sensor and a current-phase comparing watch, wherein the first current sensor and the second current sensor are respectively wound at both sides of a tested electric loop and respectively connected with the input end of a zero-crossing detector of the current-phase comparing watch. In the utility model, the grounding fault of the electric loop is rapidly tested by adopting a phase-comparing method based on a differential-protection principle, the utility model is proved to be feasible in practice, and the work efficiency for searching the grounding fault of a generator stator can be greatly improved. The electric-loop grounding-fault rapid tester is applicable to the rapid grounding-fault testing of the electric loops, such as a generator set, a 220V direct-current power-supply system, a 48V communication power-supply system and the like.
Description
Technical field
The utility model relates to hydrogenerator and DC power system electric loop testing apparatus, specifically is a kind of electric loop earth fault high speed tester.
Background technology
Stator winding ground connection is the common a kind of fault of generator, and wherein the singlephase earth fault of stator winding is particularly common.For the large and medium generator isolated neutral or through the stator winding of high resistance grounding, because singlephase earth fault does not produce bigger fault current, so the stator winding one-phase ground protection only signals or delay tripping usually.But it should be noted that the tendency of the alternate often or turn-to-turn short circuit of generator singlephase earth fault; therefore; the unit that only signals for stator winding ground connection should be notified relevant department to shut down immediately and handle, and after should investigating thoroughly fault immediately and get rid of for the genset of delay tripping, can put into operation.Differential protection is the main protection of electrical equipment and circuit (220kV), and it is made up of current transformer that is installed in the protected object both sides and differential relay, and the action consequence is the power supply of excision protection domain.The differential protection principle is applied to online protection power equipment in the past, as generator, and transformer, circuit etc.
The electric loop earth fault search and be confirmed to be the extremely time-consuming job of requiring great effort, the electric loop time out of service is long more, its economic loss is big more, the large and medium generator group is sayed, out of servicely also can exert an influence to network load, can be the task of top priority with a kind of method that can the quickly look-up fault therefore.At present, the direct current resistance of electric loop is promptly measured in searching and judge the general dc resistance method of using of earth point fault, according to the size of its resistance, and the scope of the localization of faults roughly.Because the winding D.C. resistance of high-current equipment is the milliohm level, its measuring error is bigger, can not accurately determine abort situation, can only check by the root lead with artificial, expend time in, do not have the genset of extension line for neutral point, the method can not failure judgement point wherein.
Summary of the invention
The purpose of this utility model provides a kind of fast detection prompt, electric loop earth fault high speed tester accurately.
Described electric loop earth fault high speed tester, it is characterized in that: it is made up of first, second current sensor, current phase comparison sheet, and described first, second current sensor also is connected with the zero-crossing detector input end of current phase comparison sheet respectively around tested electric loop both sides respectively.
Be provided with zero-crossing detector, synthesis phase difference unit and lead-lag indicating member in the described current phase comparison sheet, an output terminal of zero-crossing detector is connected with A/D converting digital display unit by synthesis phase difference unit, low-pass filter unit successively, and its another output terminal also is connected with A/D converting digital display unit by the lead-lag indicating member.
Described first, second current sensor is that thick magnetic conduction wire rod or silicon steel sheet material are made.Also be in series with adjustable resistance respectively in both sides, tested loop.
The utility model adopts based on the quick detecting electric of the phase-comparison method of differential protection principle loop earth fault, proves practicable in force, can greatly improve generator stator ground troubleshooting work efficiency.The utility model is applicable to that the earth fault of electric loops such as genset, 220V DC power system, 48V communication power supply system tests fast.
Description of drawings
Fig. 1 is test philosophy figure of the present utility model,
Fig. 2 is the theory diagram of current phase comparison sheet.
Among the figure: 1, first, second current sensor of 2-, 3-current phase comparison sheet, 4-adjustable resistance, 5-zero-crossing detector, 6-synthesis phase difference unit, 7-low-pass filter unit, 8-A/D converting digital display unit, 9-lead-lag indicating member, 10-stator winding.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing, among Fig. 1, described electric loop earth fault high speed tester, it is characterized in that: it is made up of first, second current sensor 1,2, current phase comparison sheet 3, and described first, second current sensor 1,2 also is connected with zero-crossing detector 5 input ends of current phase comparison sheet 3 respectively around tested electric loop both sides respectively.
Be provided with zero-crossing detector 5, synthesis phase difference unit 8 and lead-lag indicating member 9 in the described current phase comparison sheet 3, an output terminal of zero-crossing detector 5 is connected with A/D converting digital display unit 8 by synthesis phase difference unit 6, low-pass filter unit 7 successively, and its another output terminal also is connected with A/D converting digital display unit 8 by lead-lag indicating member 9.
Described first, second current sensor 1,2 is made for thick magnetic conduction wire rod or silicon steel sheet material.Also be in series with adjustable resistance 4 respectively in both sides, tested loop.
Method of testing of the present utility model is: at first, according to Fig. 1 first, second current sensor and current phase table are connected, the resistance in series in both sides, tested loop regulates, and can carry out on-line testing.When earth fault took place the K2 point, the reading of current phase comparison sheet was for being approximately 120 ° or 240 °, and when K1 point generation earth fault, the reading of current phase comparison sheet is approximately 180 ° (or 0 °), can find earth point very soon thus.
Among Fig. 1,
Claims (4)
1. electric loop earth fault high speed tester, it is characterized in that: it is made up of first, second current sensor (1,2), current phase comparison sheet (3), and described first, second current sensor (1,2) also is connected with zero-crossing detector (5) input end of current phase comparison sheet (3) respectively around tested electric loop both sides respectively.
2. electric loop earth fault high speed tester according to claim 1, it is characterized in that: be provided with zero-crossing detector (5), synthesis phase difference unit (8) and lead-lag indicating member (9) in the described current phase comparison sheet (3), an output terminal of zero-crossing detector (5) is connected with A/D converting digital display unit (8) by synthesis phase difference unit (6), low-pass filter unit (7) successively, and its another output terminal also is connected with A/D converting digital display unit (8) by lead-lag indicating member (9).
3. electric loop earth fault high speed tester according to claim 1 is characterized in that: described first, second current sensor (1,2) is made for thick magnetic conduction wire rod or silicon steel sheet material.
4. electric loop earth fault high speed tester according to claim 1 is characterized in that: also be in series with adjustable resistance (4) respectively in both sides, tested loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200598271U CN202002994U (en) | 2011-03-08 | 2011-03-08 | Electric-loop grounding-fault rapid tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200598271U CN202002994U (en) | 2011-03-08 | 2011-03-08 | Electric-loop grounding-fault rapid tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202002994U true CN202002994U (en) | 2011-10-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200598271U Expired - Fee Related CN202002994U (en) | 2011-03-08 | 2011-03-08 | Electric-loop grounding-fault rapid tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202002994U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569729A (en) * | 2015-01-29 | 2015-04-29 | 深圳市科陆电子科技股份有限公司 | Fault indicator based power distribution network single-phase earth fault detection method and fault indicator based power distribution network single-phase earth fault detection system |
| CN108666984A (en) * | 2018-03-26 | 2018-10-16 | 国网天津市电力公司 | A kind of differential protection circuit |
| CN110221165A (en) * | 2019-06-11 | 2019-09-10 | 安徽马钢设备检修有限公司 | A kind of motor differential protection test new method |
| CN110618343A (en) * | 2019-09-30 | 2019-12-27 | 广西桂冠电力股份有限公司 | Device and method for searching generator stator bar ground fault point |
-
2011
- 2011-03-08 CN CN2011200598271U patent/CN202002994U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569729A (en) * | 2015-01-29 | 2015-04-29 | 深圳市科陆电子科技股份有限公司 | Fault indicator based power distribution network single-phase earth fault detection method and fault indicator based power distribution network single-phase earth fault detection system |
| CN108666984A (en) * | 2018-03-26 | 2018-10-16 | 国网天津市电力公司 | A kind of differential protection circuit |
| CN110221165A (en) * | 2019-06-11 | 2019-09-10 | 安徽马钢设备检修有限公司 | A kind of motor differential protection test new method |
| CN110221165B (en) * | 2019-06-11 | 2021-03-26 | 安徽马钢设备检修有限公司 | Novel motor differential protection test method |
| CN110618343A (en) * | 2019-09-30 | 2019-12-27 | 广西桂冠电力股份有限公司 | Device and method for searching generator stator bar ground fault point |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111005 Termination date: 20120308 |