CN201868841U - Low-voltage blocked overcurrent protection circuit - Google Patents
Low-voltage blocked overcurrent protection circuit Download PDFInfo
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- CN201868841U CN201868841U CN2010206350631U CN201020635063U CN201868841U CN 201868841 U CN201868841 U CN 201868841U CN 2010206350631 U CN2010206350631 U CN 2010206350631U CN 201020635063 U CN201020635063 U CN 201020635063U CN 201868841 U CN201868841 U CN 201868841U
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Abstract
The utility model discloses a low-voltage blocked overcurrent protection circuit, which comprises a current transformer, a trip coil, a current relay, a voltage relay, a voltage transformer and a time relay, wherein one end of a first coil for the current transformer is grounded; the other end of the first coil for the current transformer is connected with one end of a coil for the current relay; the other end of the coil for the current relay is grounded; a coil for the voltage relay is connected with the voltage transformer which is connected with a bus for supplying power through an isolating switch; one end of a normally-opened contact of the current relay is connected with the anode of a power supply; the other end of the normally-opened contact of the current relay is sequentially connected with a normally-closed contact of the voltage relay and a coil of the time relay in series; the coil of the time relay is connected with the cathode of the power supply; one end of the normally-opened contact of the time relay is connected with the anode of the power supply; the other end of the normally-opened contact of the time relay is connected with one end of the trip coil; and the other end of the trip coil is connected with the cathode of the power supply. The low-voltage blocked overcurrent protection circuit is beneficial to improving the sensitivity of the circuit protection.
Description
Technical field
The utility model relates to the protective device of low-voltage circuit, is specifically related to a kind of circuit overcurrent protection of low-voltage dead lock.
Background technology
Along with the development of electrical technology, circuit protection develops towards comprehensive and complexity direction, and various protective circuits go out mutually then, and defencive function is a lot, such as excess temperature, and overcurrent, overvoltage, under-voltage, short circuit etc.In a lot of countries countries and regions of remote backwardness particularly, the voltage of electrical network is unstable especially, cause circuit can't be for a long time, move reliably, therefore, unsettled voltage will cause the system failure probably, cause bigger systemic breakdown takes place, cause damage.
Summary of the invention
At above-mentioned technical problem, the purpose of this utility model provides a kind of circuit overcurrent protection that can improve the low-voltage dead lock of sensitivity.
The technical scheme that realizes above-mentioned purpose is as follows:
The circuit overcurrent protection of low-voltage dead lock comprises current transformer, breaking coil, current relay, voltage relay, voltage transformer, the time relay; One end ground connection of first coil of current transformer, the other end connects an end of the coil of current relay, the other end ground connection of the coil of current relay; The coil of voltage relay is connected with voltage transformer, and voltage transformer also is connected with the bus of power supply by isolating switch; One end of the normally opened contact of current relay connects positive source, and the other end is connected with the normally-closed contact of voltage relay and the coil of the time relay successively, and the coil of the time relay is connected with the negative pole of power supply; One end of the normally opened contact of the time relay connects positive source, and the other end is connected with an end of breaking coil, and the other end of breaking coil connects power cathode.
Adopted such scheme, when electric power system was normally moved, busbar voltage approached rated voltage, so the normally-closed contact of voltage relay disconnects.Because the normally-closed contact of voltage relay is connected with the normally opened contact of current relay, therefore current relay at this moment is because circuit is crossed negative tea and the also unlikely contact tripping operation that causes circuit breaker of misoperation.When circuit surpasses rated voltage, when causing overcurrent, make the voltage relay dead electricity by voltage transformer, the normally-closed contact closure of voltage relay, the coil of current relay gets electric, and the coil of the time relay gets, after the time of setting, the normally opened contact closure of the time relay, connection signal relay and breaking coil make the contact tripping operation of circuit breaker successively.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Embodiment
With reference to Fig. 1; the circuit overcurrent protection of low-voltage dead lock of the present utility model; the circuit overcurrent protection of low-voltage dead lock comprises current transformer, breaking coil YR, current relay, voltage relay, voltage transformer, the time relay and signal relay.The end ground connection of the first coil TA1 of current transformer, the other end connects the end of the coil KA of current relay, the other end ground connection of the coil KA of current relay; The coil KV of voltage relay is connected with voltage transformer TV, and voltage transformer TV also is connected with the bus of power supply; The end of the normally opened contact KA1 of current relay connects positive source, and the other end is connected with the normally-closed contact KV1 of voltage relay and the coil KT of the time relay successively, and the coil KT of the time relay is connected with the negative pole of power supply; The end of the normally opened contact KT1 of the time relay connects positive source, and the other end is connected with the end of breaking coil YR, and the other end of breaking coil YR connects power cathode.The coil KS of described signal relay is serially connected between the normally opened contact KT1 and breaking coil YR of the time relay, and the normally opened contact KS1 of signal relay is serially connected in the signal circuit.
Claims (2)
1. the circuit overcurrent protection of low-voltage dead lock is characterized in that: comprise current transformer, breaking coil (YR), current relay, voltage relay, voltage transformer, the time relay; One end ground connection of first coil (TA1) of current transformer, the other end connects an end of the coil (KA) of current relay, the other end ground connection of the coil of current relay (KA); The coil of voltage relay (KV) is connected with voltage transformer (TV), and voltage transformer (TV) also is connected by the bus of isolating switch (QS) with power supply; One end of the normally opened contact of current relay (KA1) connects positive source, and the other end is connected with the normally-closed contact (KV1) of voltage relay and the coil (KT) of the time relay successively, and the coil of the time relay (KT) is connected with the negative pole of power supply; One end of the normally opened contact of the time relay (KT1) connects positive source, and the other end is connected with an end of breaking coil (YR), and the other end of breaking coil (YR) connects power cathode.
2. the circuit overcurrent protection of low-voltage dead lock according to claim 1; it is characterized in that: also comprise a signal relay; the coil of this signal relay (KS) is serially connected between the normally opened contact (KT1) and breaking coil (YR) of the time relay, and the normally opened contact of signal relay (KS1) is serially connected in the signal circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206350631U CN201868841U (en) | 2010-12-01 | 2010-12-01 | Low-voltage blocked overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206350631U CN201868841U (en) | 2010-12-01 | 2010-12-01 | Low-voltage blocked overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201868841U true CN201868841U (en) | 2011-06-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206350631U Expired - Fee Related CN201868841U (en) | 2010-12-01 | 2010-12-01 | Low-voltage blocked overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201868841U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916385A (en) * | 2011-08-02 | 2013-02-06 | 伊春电业局 | Instrument testing protective device |
| CN103278674A (en) * | 2013-06-11 | 2013-09-04 | 鞍钢股份有限公司 | Electric current monitoring circuit and method |
| CN106229944A (en) * | 2016-08-02 | 2016-12-14 | 浙江华采科技有限公司 | A kind of earthed voltage transformer exciting current protection device |
| CN109991533A (en) * | 2019-03-11 | 2019-07-09 | 国网新疆电力有限公司昌吉供电公司 | Counter type control loop exports monitoring device |
| CN111525509A (en) * | 2020-06-01 | 2020-08-11 | 攀钢集团西昌钢钒有限公司 | Rectifier transformer of power system and over-current protection setting method used for rectifier transformer |
-
2010
- 2010-12-01 CN CN2010206350631U patent/CN201868841U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916385A (en) * | 2011-08-02 | 2013-02-06 | 伊春电业局 | Instrument testing protective device |
| CN102916385B (en) * | 2011-08-02 | 2015-04-22 | 伊春电业局 | Instrument testing protective device |
| CN103278674A (en) * | 2013-06-11 | 2013-09-04 | 鞍钢股份有限公司 | Electric current monitoring circuit and method |
| CN106229944A (en) * | 2016-08-02 | 2016-12-14 | 浙江华采科技有限公司 | A kind of earthed voltage transformer exciting current protection device |
| CN106229944B (en) * | 2016-08-02 | 2018-11-27 | 浙江华采科技有限公司 | A kind of earthed voltage transformer exciting current protective device |
| CN109991533A (en) * | 2019-03-11 | 2019-07-09 | 国网新疆电力有限公司昌吉供电公司 | Counter type control loop exports monitoring device |
| CN111525509A (en) * | 2020-06-01 | 2020-08-11 | 攀钢集团西昌钢钒有限公司 | Rectifier transformer of power system and over-current protection setting method used for rectifier transformer |
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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: 20110615 Termination date: 20111201 |