CN2859554Y - DC ground connection fault indicator - Google Patents
DC ground connection fault indicator Download PDFInfo
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- CN2859554Y CN2859554Y CN 200520041437 CN200520041437U CN2859554Y CN 2859554 Y CN2859554 Y CN 2859554Y CN 200520041437 CN200520041437 CN 200520041437 CN 200520041437 U CN200520041437 U CN 200520041437U CN 2859554 Y CN2859554 Y CN 2859554Y
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Abstract
The utility model discloses a DC ground connection fault indicator. Wherein, one end of the detection circuit connects with one end of the sensor. The other end of the detection circuit connects with one end of the amplified circuit. The other end of the amplified circuit connects with one end of the output circuit. The output ends of the detection circuit, amplified circuit and output circuit connect with the working power source. The utility model takes a single core modulator as the detecting element. It not only deducts the complex filtering and demodulation, but also has a succinct amplified circuit and a succinct system ancillary circuit. The phase measurement is more strengthened than the amplitude measure in the ability of interference resistance. The indicator can be operated conveniently and adjusted easily.
Description
Technical field:
The utility model relates to the technical field of electric power with the direct supply supervising device, a kind of specifically DC ground fault indicator.
Background technology:
In relay protection system; when direct supply generation earth fault; be easy to have an accident; cause the certain economic loss, and the effect of existing DC ground fault indicator all is not very desirable, the test effect stability is poor; poor anti jamming capability; the adjustment complexity, the circuit structure complexity, cost is higher.
Summary of the invention:
The purpose of this utility model is to provide a kind of DC ground fault indicator, and it is poor that it can overcome prior art test effect stability, poor anti jamming capability, adjustment complexity, circuit structure complexity, the more high some shortcomings of cost.
To achieve these goals, the technical solution of the utility model is: a kind of DC ground fault indicator, it mainly comprises sensor, it is characterized in that: sensor one end is connected with testing circuit one end, the testing circuit other end is connected with amplifying circuit one end, the amplifying circuit other end is connected with output circuit one end, and the power input of testing circuit, amplifying circuit, output circuit all is connected with working power.
The utility model is a detecting element with single iron core modulator; the edge resonance oscillation detection technique of uses advanced develops; the product design structure is the terminals form; directly be inlaid on the various relay-set terminals rows; indication direct supply abort situation and character, it is succinct to save complicated filtering, demodulation, amplifying circuit, system supplymentary circuit, and phase measurement is stronger than amplitude measurement antijamming capability; easy to use, adjustment is easy.
Description of drawings:
Fig. 1 is a structural representation of the present utility model
Fig. 2 is the utility model circuit theory diagrams
Embodiment:
With reference to the accompanying drawings, the utility model further is described.
The utility model mainly comprises sensor 1, it is characterized in that: sensor one end is connected with testing circuit 2 one ends, the testing circuit other end is connected with amplifying circuit 3 one ends, the amplifying circuit other end is connected with output circuit 4 one ends, and the power input of testing circuit, amplifying circuit, output circuit all is connected with working power 5.
In the specific implementation, a detection chip pin is connected with an end of capacitor C 2 in the testing circuit, the other end of capacitor C 2 respectively with capacitor C 1 one ends, resistance R 5 one ends connect, the other end of resistance R 5 respectively with No. two pins of a detection chip, resistance R 3 one ends connect, the other end of resistance R 3 respectively with resistance R 2 one ends, No. five pins of a detection chip connect, resistance R 2 other ends respectively with resistance R 4 one ends, capacitor C 3 one ends connect, the other end of resistance R 4 respectively with No. six pins of a detection chip, resistance R 6 one ends connect, the other end of capacitor C 3 respectively with resistance R 7 one ends, resistance R 7A one end connects, the other end of resistance R 7 is connected with the other end of capacitor C 1, the resistance R 7A other end is connected with capacitor C 2, a pin of No. two detection chip respectively with resistance R 13 1 ends, capacitor C 7 one ends connect, No. two pins of No. two detection chip respectively with resistance R 13 other ends, capacitor C 7 other ends connect, No. seven pins of No. two detection chip and capacitor C 10 1 ends, No. six pins of No. two detection chip are connected with capacitor C 10 other ends.The base stage of triode T5 is connected with resistance R 21 1 ends, resistance R 22 1 ends respectively in amplifying circuit, resistance R 22 1 ends are connected with the base stage of triode T6, the collector of triode T5 is connected with light emitting diode L2 negative pole, the positive pole of light emitting diode L2 is connected with resistance R 19 1 ends, the transmitter of triode T6 is connected with the positive pole of light emitting diode L3, and the negative pole of light emitting diode L3 is connected with an end of resistance R 20.
This DC ground fault indicator is a detecting element with single iron core modulator, the edge resonance oscillation detection technique of uses advanced develops, the product design structure is the terminals form, indication direct supply abort situation and character, it is succinct to save complicated filtering, demodulation, amplifying circuit, system supplymentary circuit, antijamming capability is strong, and is easy to use, and adjustment is easy.
Claims (3)
1, a kind of DC ground fault indicator, it mainly comprises sensor (1), it is characterized in that: sensor one end is connected with testing circuit (2) one ends, the testing circuit other end is connected with amplifying circuit (3) one ends, the amplifying circuit other end is connected with output circuit (4) one ends, and the power input of testing circuit, amplifying circuit, output circuit all is connected with working power (5).
2, a kind of DC ground fault indicator according to claim 1, it is characterized in that: a detection chip pin is connected with an end of electric capacity (C2) in the testing circuit, the other end of electric capacity (C2) respectively with electric capacity (C1) end, resistance (R5) end connects, the other end of resistance (R5) respectively with No. two pins of a detection chip, resistance (R3) end connects, the other end of resistance (R3) respectively with resistance (R2) end, No. five pins of a detection chip connect, resistance (R2) other end respectively with resistance R 4 one ends, electric capacity (C3) end connects, the other end of resistance (R4) respectively with No. six pins of a detection chip, resistance (R6) end connects, the other end of electric capacity (C3) respectively with resistance (R7) end, resistance (R7A) end connects, the other end of resistance R 7 is connected with the other end of electric capacity (C1), resistance (R7A) other end is connected with electric capacity (C2), a pin of No. two detection chip respectively with resistance (R13) end, electric capacity (C7) end connects, No. two pins of No. two detection chip respectively with resistance (R13) other end, electric capacity (C7) other end connects, No. seven pins of No. two detection chip and electric capacity (C10) end, No. six pins of No. two detection chip are connected with electric capacity (C10) other end.
3, a kind of DC ground fault indicator according to claim 2, it is characterized in that: the base stage of triode in amplifying circuit (T5) is connected with resistance (R21) end, resistance (R22) end respectively, resistance (R22) end is connected with the base stage of triode (T6), the collector of triode (T5) is connected with light emitting diode (L2) negative pole, the positive pole of light emitting diode (L2) is connected with resistance (R19) end, the transmitter of triode (T6) is connected with the positive pole of light emitting diode (L3), and the negative pole of light emitting diode (L3) is connected with an end of resistance (R20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520041437 CN2859554Y (en) | 2005-05-11 | 2005-05-11 | DC ground connection fault indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520041437 CN2859554Y (en) | 2005-05-11 | 2005-05-11 | DC ground connection fault indicator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2859554Y true CN2859554Y (en) | 2007-01-17 |
Family
ID=37612413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520041437 Expired - Lifetime CN2859554Y (en) | 2005-05-11 | 2005-05-11 | DC ground connection fault indicator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2859554Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101452034B (en) * | 2007-11-30 | 2011-08-10 | 上海市电力公司 | Portable intelligent DC earthing searching instrument |
| CN101776723B (en) * | 2009-12-25 | 2013-07-24 | 上海希明电气技术有限公司 | Method for detecting earth fault of direct current system by utilizing frequency deviation method |
| CN103645418A (en) * | 2013-12-04 | 2014-03-19 | 国家电网公司 | Earth fault line selector for transformer station direct current system |
| CN105044549A (en) * | 2015-04-14 | 2015-11-11 | 广西电网有限责任公司电力科学研究院 | Direct current grounding searching method with self compensation current |
-
2005
- 2005-05-11 CN CN 200520041437 patent/CN2859554Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101452034B (en) * | 2007-11-30 | 2011-08-10 | 上海市电力公司 | Portable intelligent DC earthing searching instrument |
| CN101776723B (en) * | 2009-12-25 | 2013-07-24 | 上海希明电气技术有限公司 | Method for detecting earth fault of direct current system by utilizing frequency deviation method |
| CN103645418A (en) * | 2013-12-04 | 2014-03-19 | 国家电网公司 | Earth fault line selector for transformer station direct current system |
| CN105044549A (en) * | 2015-04-14 | 2015-11-11 | 广西电网有限责任公司电力科学研究院 | Direct current grounding searching method with self compensation current |
| CN105044549B (en) * | 2015-04-14 | 2018-04-20 | 广西电网有限责任公司电力科学研究院 | A kind of direct current grounding trouble shooting method with self compensation electric current |
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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 | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150511 Granted publication date: 20070117 |