CN201868839U - Over-current protection circuit - Google Patents
Over-current protection circuit Download PDFInfo
- Publication number
- CN201868839U CN201868839U CN2010206349600U CN201020634960U CN201868839U CN 201868839 U CN201868839 U CN 201868839U CN 2010206349600 U CN2010206349600 U CN 2010206349600U CN 201020634960 U CN201020634960 U CN 201020634960U CN 201868839 U CN201868839 U CN 201868839U
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- circuit
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- coil
- action type
- direct action
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- Expired - Fee Related
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Abstract
The utility model discloses an over-current protection circuit comprising a main circuit and a control circuit; a contact of a circuit breaker is connected on the main circuit which is provided with a current transformer; the control circuit comprises a trip coil of the circuit breaker and a direct-acting current relay coil; two ends of the direct-acting current relay coil are connected with the current transformer; the output end of the direct-acting current relay coil is connected with one end of a normally open contact of the direct-acting relay; and the other end of the normally open contact is connected with the trip coil. The over-current protection circuit has the advantage of simple structure.
Description
Technical field
The utility model relates to a kind of circuit overcurrent protection.
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.But existing these protective circuits all have a common point, and the components and parts that just relate to are a lot, and structure is comparatively complicated.
Summary of the invention
At above-mentioned technical problem, the purpose of this utility model provides a kind of circuit overcurrent protection simple in structure.
The technical scheme that realizes above-mentioned purpose is as follows:
Circuit overcurrent protection; comprise main circuit and control circuit; the contact of circuit breaker is connected on the main circuit; main circuit is provided with current transformer; described control circuit comprises the breaking coil and the Direct Action Type current relay coil of circuit breaker; the two ends of Direct Action Type current relay coil are connected with current transformer, and the output of Direct Action Type current relay coil connects an end of the normally opened contact of this Direct Action Type relay, and the normally opened contact other end connects breaking coil.
Adopted such scheme, when primary circuit generation phase fault, the Direct Action Type relay gets electric, the energising of Direct Action Type relay coil, and its normally opened contact closure is connected breaking coil, makes the contact tripping operation of circuit breaker, the excision short trouble.The utility model can make circuit cut off the electricity supply immediately when short circuit by several simple components and parts, makes circuit obtain corresponding protection, therefore, has advantage of simple structure.
In addition, adopted the intermediate current instrument transformer in the control circuit of the present utility model, the iron core of this intermediate current instrument transformer has fast saturation, its can be when short circuit the electric current of restricted passage breaking coil, and the secondary load impedance that reduces primary circuit and secondary circuit.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Embodiment
With reference to Fig. 1, circuit overcurrent protection of the present utility model comprises main circuit and control circuit, also is provided with high voltage isolator QS on the described main circuit, and the contact QF of circuit breaker is connected on the main circuit, and main circuit is provided with current transformer TA.The end of high voltage isolator QS connects power line, and its other end connects the end of contact QF.Described control circuit comprises the breaking coil YR and the Direct Action Type current relay coil KA of circuit breaker, the two ends of Direct Action Type current relay coil KA are connected with current transformer TA, the output of Direct Action Type current relay coil KA connects the end of the normally opened contact KA1 of this Direct Action Type relay, and the normally opened contact KA1 other end connects breaking coil YR.Described control circuit also comprises intermediate current instrument transformer TAM, and an end of this intermediate current instrument transformer connects normally opened contact KA1, and the other end connects breaking coil YR.
The course of work of the present utility model is: when normal operation circuit, the direct drive type electro current relay is failure to actuate, Direct Action Type relay coil KA no power, normally opened contact KA1 disconnects, secondary circuit is in open-circuit condition, the breaking coil YR no power of circuit breaker is not so the contact QF of circuit breaker can trip.During primary circuit generation phase fault, the Direct Action Type relay gets electric, Direct Action Type relay coil KA energising, its normally opened contact KA1 closure is connected breaking coil YR, supplies with tripping current by intermediate current instrument transformer TAM, make the contact QF tripping operation of circuit breaker, the excision short trouble.
Claims (2)
1. circuit overcurrent protection; comprise main circuit and control circuit; the contact of circuit breaker (QF) is connected on the main circuit; main circuit is provided with current transformer (TA); it is characterized in that: described control circuit comprises the breaking coil (YR) and the Direct Action Type current relay coil (KA) of circuit breaker; the two ends of Direct Action Type current relay coil (KA) are connected with current transformer (TA); the output of Direct Action Type current relay coil (KA) connects an end of the normally opened contact (KA1) of this Direct Action Type relay, and normally opened contact (KA1) other end connects breaking coil (YR).
2. circuit overcurrent protection according to claim 1 is characterized in that: described control circuit also comprises intermediate current instrument transformer (TAM), and an end of this intermediate current instrument transformer connects normally opened contact (KA1), and the other end connects breaking coil (YR).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206349600U CN201868839U (en) | 2010-12-01 | 2010-12-01 | Over-current protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206349600U CN201868839U (en) | 2010-12-01 | 2010-12-01 | Over-current protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201868839U true CN201868839U (en) | 2011-06-15 |
Family
ID=44139982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206349600U Expired - Fee Related CN201868839U (en) | 2010-12-01 | 2010-12-01 | Over-current protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201868839U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790381A (en) * | 2012-08-23 | 2012-11-21 | 四川省电力公司绵阳电业局 | Tripping control device for start of switching current of distribution network 10kV switching station |
| CN104330607A (en) * | 2014-07-15 | 2015-02-04 | 国家电网公司 | AC-into-DC-system detection and forced tripping device |
-
2010
- 2010-12-01 CN CN2010206349600U patent/CN201868839U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790381A (en) * | 2012-08-23 | 2012-11-21 | 四川省电力公司绵阳电业局 | Tripping control device for start of switching current of distribution network 10kV switching station |
| CN104330607A (en) * | 2014-07-15 | 2015-02-04 | 国家电网公司 | AC-into-DC-system detection and forced tripping device |
| CN104330607B (en) * | 2014-07-15 | 2018-05-11 | 国家电网公司 | Alternating current scurries into the detection of straight-flow system and compels to jump device |
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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 |