CN214412272U - Prevent inconsistent protection circuit of circuit breaker body three-phase of malfunction - Google Patents
Prevent inconsistent protection circuit of circuit breaker body three-phase of malfunction Download PDFInfo
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- CN214412272U CN214412272U CN202120438845.4U CN202120438845U CN214412272U CN 214412272 U CN214412272 U CN 214412272U CN 202120438845 U CN202120438845 U CN 202120438845U CN 214412272 U CN214412272 U CN 214412272U
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Abstract
The utility model provides a prevent inconsistent protection circuit of circuit breaker body three-phase of malfunction, including the supplementary normally closed contact parallel unit CB of circuit breaker three-phase and the supplementary normally open contact parallel unit CK of three-phase series connection in proper order, the front end termination A1 and the supplementary normally closed contact parallel unit CB of three-phase of the inconsistent tripping operation export relay KM of three-phase, the intermediate point a electricity that both series-connected of the supplementary normally open contact parallel unit CK of three-phase is connected, delay on-time relay KT's supplementary normally open contact rear end and power negative pole electricity are connected, the supplementary normally open contact front end of three-phase of the inconsistent tripping operation export relay KM of three-phase is connected the back and is connected with intermediate point a electricity, the rear end is connected with A, B, C looks circuit breaker tripping circuit respectively. The method not only ensures the normal output of the inconsistent protection actions of three phases, but also prevents the misoperation of KM, reduces the electric elements and increases the reliability of the circuit.
Description
Technical Field
The utility model relates to an electric power safety equipment field, especially a prevent inconsistent protection circuit of circuit breaker body three-phase of malfunction.
Background
In order to prevent the non-full-phase operation of the power grid circuit breaker above 220kV caused by the single-phase fault and late separation of the circuit breaker and further develop the generator accident and the power grid accident, the three-phase inconsistent protection of the circuit breaker body is configured for the circuit breaker above 220kV at present. The basic principle of protection is as follows: as shown in the attached figure 2, when the three-phase states of the circuit breaker are inconsistent, the three-phase inconsistent auxiliary contact combined loop CB and CK of the circuit breaker are conducted, the three-phase inconsistent time relay KT is started, the normally-open contact 1-2 of the KT is conducted after setting delay, the three-phase inconsistent tripping outlet relay KM is started, and the normally-open contacts 1-2, 3-4 and 5-6 of KM are conducted, so that the tripping loop of the circuit breaker is triggered, and the circuit breaker is tripped to realize three-phase inconsistent protection.
In actual operation, because inconsistent export relay KM of three-phase and normally open contact is directly connected at the positive electricity end, when the inconsistent export relay KM of three-phase is touched by mistake, or because reasons such as direct current ground lead to KM maloperation for when KM normally open contact is closed, will lead to the occurence of failure of mistake jump circuit breaker.
For example, chinese patent document CN209642333U describes a three-phase inconsistency protection circuit of a circuit breaker main body, in which a three-phase inconsistency auxiliary contact combination circuit of the circuit breaker is formed by combining a normally open contact in front of the circuit breaker main body and a normally closed contact in back of the circuit breaker main body. Through the combination of the normally closed auxiliary contact of the newly-added breaker, the outlet relay KM and the normally open contact thereof are connected to the newly-added normally closed contact, the loop is complex, and the risk of refusing action is increased.
Disclosure of Invention
The utility model aims to solve the technical problem that a prevent inconsistent protection circuit of breaker body three-phase of malfunction is provided, the three-phase inconsistent tripping operation export relay KM or the inconsistent tripping operation export relay KM maloperation that can avoid artificial mistake to bump and lead to the mistake circuit breaker that jumps.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
a three-phase inconsistent protection circuit of a circuit breaker body for preventing misoperation comprises a circuit breaker three-phase auxiliary normally closed contact parallel unit CB and a three-phase auxiliary normally open contact parallel unit CK which are sequentially connected in series, wherein the front end parallel point of the three-phase auxiliary normally closed contact parallel unit CB is electrically connected with a power supply positive electrode, the rear end of the three-phase auxiliary normally open contact parallel unit CK is electrically connected with a time delay relay KT coil, the other end of the time delay relay KT coil is connected with a power supply negative electrode, a three-phase inconsistent tripping outlet relay KM is electrically connected with an auxiliary normally open contact of the time delay relay KT, the front end A1 of the three-phase inconsistent tripping outlet relay KM is electrically connected with a middle point a of the three-phase auxiliary normally closed contact parallel unit CB and the three-phase auxiliary normally open contact parallel unit CK which are connected in series, and the rear end of the auxiliary normally open contact of the time delay relay KT is electrically connected with the power supply negative electrode, the three-phase auxiliary normally open contact front ends of the three-phase inconsistent tripping outlet relay KM are connected in parallel and then electrically connected with the intermediate point a, and the rear ends of the three-phase auxiliary normally open contacts are respectively connected with the tripping loop of the A, B, C-phase circuit breaker.
The utility model provides a prevent inconsistent protection circuit of breaker body three-phase of malfunction, with the inconsistent trip outlet relay KM action power supply positive pole of three-phase from the direct connection power supply positive pole to change into the intermediate junction a that is connected to supplementary normally closed contact parallel unit CB of three-phase and the supplementary normally open contact parallel unit CK of three-phase, when the circuit breaker three-phase state is inconsistent, the series circuit of supplementary normally closed contact parallel unit CB of three-phase and the supplementary normally open contact parallel unit CK of three-phase is put through, intermediate junction a is positive, can normally trigger the inconsistent trip outlet relay KM action of three-phase, when the circuit normal operating and circuit breaker is in the position of closing the floodgate, supplementary normally closed contact parallel unit CB of three-phase breaks off, intermediate junction a is uncharged, therefore even though the inconsistent trip outlet relay KM of three-phase or reasons such as direct current ground connection lead to the KM mistake to move, when KM normally open contact is closed, and because the intermediate point a is not electrified, the tripping action can not be output.
Drawings
The invention will be further explained with reference to the following figures and examples:
FIG. 1 is a structural connection diagram of the present invention;
fig. 2 is a conventional three-phase inconsistent protection circuit.
Detailed Description
As shown in fig. 1-2, a three-phase inconsistent protection circuit of a circuit breaker body for preventing misoperation comprises a circuit breaker three-phase auxiliary normally closed contact parallel unit CB and a three-phase auxiliary normally open contact parallel unit CK which are sequentially connected in series, wherein the parallel point at the front end of the three-phase auxiliary normally closed contact parallel unit CB is electrically connected with the positive pole of a power supply, the rear end of the three-phase auxiliary normally open contact parallel unit CK is electrically connected with a coil of a delay on-time relay KT, the other end of the coil of the delay on-time relay KT is connected with the negative pole of the power supply, a three-phase inconsistent tripping outlet relay KM is electrically connected with an auxiliary normally open contact of the delay on-time relay KT, a front end contact A1 of the three-phase inconsistent tripping outlet relay KM is electrically connected with a middle point a of the series connection of the three-phase auxiliary normally closed contact parallel unit CB and the three-phase auxiliary normally open contact parallel unit CK, and the rear end of the auxiliary normally open contact of the delay on-time relay KT is electrically connected with the negative pole of the power supply, the three-phase auxiliary normally open contact front ends of the three-phase inconsistent tripping outlet relay KM are connected in parallel and then electrically connected with the intermediate point a, and the rear ends of the three-phase auxiliary normally open contacts are respectively connected with the tripping loop of the A, B, C-phase circuit breaker.
The action power supply positive pole of the three-phase inconsistent tripping outlet relay KM is converted into an intermediate connection point a connected to the three-phase auxiliary normally closed contact parallel unit CB and the three-phase auxiliary normally open contact parallel unit CK from the direct connection power supply positive pole, when the three-phase states of the circuit breaker are inconsistent, the series circuit of the three-phase auxiliary normally closed contact parallel unit CB and the three-phase auxiliary normally open contact parallel unit CK is connected, the intermediate point a is positively charged, the action of the three-phase inconsistent tripping outlet relay KM can be normally triggered, when the circuit normally runs and the circuit breaker is in a switching-on position, the three-phase auxiliary normally closed contact parallel unit CB is disconnected, the intermediate point a is uncharged, even if the three-phase inconsistent tripping outlet relay KM or direct current grounding and other reasons are touched by mistake, and when the KM normally open contact is closed, the intermediate point a is uncharged, the tripping action cannot be output.
In the three-phase inconsistent protection circuit of the circuit breaker body described in chinese patent document CN209642333U, an additional three-phase auxiliary normally closed contact CB2 is added at the front end of the three-phase inconsistent trip outlet relay KM, so that the requirement on the circuit breaker is high, and the failure rate is increased by adding one electrical component, which is contrary to the original intention of reducing the failure rate in the malfunction.
Claims (1)
1. The utility model provides a circuit breaker body three-phase inconsistent protection circuit of preventing malfunction which characterized by: the three-phase auxiliary normally closed contact parallel unit CB and the three-phase auxiliary normally open contact parallel unit CK are sequentially connected in series, the front end parallel point of the three-phase auxiliary normally closed contact parallel unit CB is electrically connected with a positive electrode of a power supply, the rear end of the three-phase auxiliary normally open contact parallel unit CK is electrically connected with a coil of a delay on-time relay KT, the other end of the coil of the delay on-time relay KT is connected with a negative electrode of the power supply, a three-phase inconsistent tripping outlet relay KM is electrically connected with an auxiliary normally open contact of the delay on-time relay KT, a front end point A1 of the three-phase inconsistent tripping outlet relay KM is electrically connected with a middle point a of the three-phase auxiliary normally closed contact parallel unit CB and the three-phase auxiliary normally open contact parallel unit CK which are connected in series, the rear end of the auxiliary normally open contact of the delay on-time relay KT is electrically connected with the negative electrode of the power supply, and the front end of the three-phase auxiliary normally open contact of the three-phase inconsistent tripping outlet relay KM is electrically connected in parallel and then electrically connected with the middle point a, the rear ends are respectively connected with A, B, C phase breaker tripping loops.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120438845.4U CN214412272U (en) | 2021-03-01 | 2021-03-01 | Prevent inconsistent protection circuit of circuit breaker body three-phase of malfunction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120438845.4U CN214412272U (en) | 2021-03-01 | 2021-03-01 | Prevent inconsistent protection circuit of circuit breaker body three-phase of malfunction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214412272U true CN214412272U (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120438845.4U Active CN214412272U (en) | 2021-03-01 | 2021-03-01 | Prevent inconsistent protection circuit of circuit breaker body three-phase of malfunction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214412272U (en) |
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2021
- 2021-03-01 CN CN202120438845.4U patent/CN214412272U/en active Active
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