CN117117793A - Circuit breaker protection circuit - Google Patents
Circuit breaker protection circuit Download PDFInfo
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- CN117117793A CN117117793A CN202310911858.2A CN202310911858A CN117117793A CN 117117793 A CN117117793 A CN 117117793A CN 202310911858 A CN202310911858 A CN 202310911858A CN 117117793 A CN117117793 A CN 117117793A
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- 238000004891 communication Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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Abstract
The present disclosure proposes a circuit breaker protection circuit comprising: the input end of the control unit is connected with the output end of the circuit breaker, and the control unit is used for outputting a signal when at least one phase of the circuit breaker is disconnected and at least one phase of the circuit breaker is conducted; the input end of the switch unit is connected with the output end of the circuit breaker and the output end of the control unit respectively, the output end of the switch unit is connected with the input end of the circuit breaker, and the switch unit is used for disconnecting three phases of the circuit breaker when at least one phase of the circuit breaker is disconnected and the control unit outputs signals. In the circuit breaker protection circuit, the protection circuit utilizes the control unit and the circuit breaker to control the switch unit simultaneously, so that double protection is realized, misoperation of the switch unit caused by faults such as moisture and short circuit of a certain device is avoided, and stable operation of the circuit breaker is ensured while protection of the circuit breaker is realized.
Description
Technical Field
The disclosure relates to the technical field of circuit breaker protection, in particular to a circuit breaker protection circuit.
Background
A circuit breaker refers to a switching device capable of closing, carrying and opening a current under normal circuit conditions and closing, carrying and opening a current under abnormal circuit conditions within a prescribed time. The circuit breaker is easy to generate three-phase inconsistency due to open-circuit or closing failure of a certain phase coil in use, so that long-term non-full-phase operation of the circuit breaker is caused, and further the damage problem and the circuit safety problem of the circuit breaker are caused.
Therefore, the protection circuit is required to protect the circuit breaker so as to break the circuit of the circuit breaker when the circuit breaker has the problem of inconsistent three phases, but the current protection circuit is only single protection, is easy to cause misoperation due to faults such as moisture and short circuit of devices, and cannot meet the requirement of stable operation of the circuit breaker.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
To this end, an object of the present disclosure is to provide a circuit breaker protection circuit.
To achieve the above object, the present disclosure provides a circuit breaker protection circuit, comprising: the input end of the control unit is connected with the output end of the circuit breaker, and the control unit is used for outputting a signal when at least one phase of the circuit breaker is disconnected and at least one phase of the circuit breaker is conducted; the input end of the switch unit is connected with the output end of the circuit breaker and the output end of the control unit respectively, the output end of the switch unit is connected with the input end of the circuit breaker, and the switch unit is used for disconnecting three phases of the circuit breaker when at least one phase of the circuit breaker is disconnected and the control unit outputs signals.
Optionally, the control unit includes: a first intermediate relay, the first intermediate relay comprising: the circuit breaker comprises a first coil, a first A-phase normally-open contact, a first B-phase normally-open contact and a first C-phase normally-open contact, wherein the first coil is in linkage with the output end of the circuit breaker, the first coil is respectively in linkage with the first A-phase normally-open contact, the first B-phase normally-open contact and the first C-phase normally-open contact, the first A-phase normally-open contact, the first B-phase normally-open contact and the first C-phase normally-open contact are in parallel connection, and the first A-phase normally-open contact, the first B-phase normally-open contact and the first C-phase normally-open contact are respectively in linkage with the input end of the switch unit; the first coil is used for being electrified when at least one phase of the circuit breaker is disconnected and at least one phase of the circuit breaker is conducted, and the switch unit is used for disconnecting three phases of the circuit breaker when at least one phase of the circuit breaker is disconnected and the first A-phase normally open contact, the first B-phase normally open contact and the first C-phase normally open contact are all conducted.
Optionally, the circuit breaker includes: the device comprises a first A-phase coil, a first A-phase normally-closed contact, a first B-phase coil, a first B-phase normally-closed contact, a first C-phase coil and a first C-phase normally-closed contact, wherein the first A-phase coil is linked with the first A-phase normally-closed contact, the first B-phase coil is linked with the first B-phase normally-closed contact, the first C-phase coil is linked with the first C-phase normally-closed contact, the first A-phase normally-closed contact, the first B-phase normally-closed contact and the first C-phase normally-closed contact are connected in parallel, the first A-phase normally-closed contact is connected in series with the first A-phase normally-open contact, the first B-phase normally-closed contact is connected in series with the first B-phase normally-open contact, and the first C-phase normally-closed contact is connected in series with the first C-phase normally-closed contact; the switching unit is used for switching on at least one of the first A-phase normally-open contact, the first B-phase normally-open contact and the first C-phase normally-open contact and switching off three phases of the circuit breaker when the first A-phase normally-open contact, the first B-phase normally-open contact and the first C-phase normally-open contact are all switched on.
Optionally, the circuit breaker further includes: the first phase A normally-closed contact, the second phase B normally-closed contact, the second phase C normally-closed contact, the second phase A normally-closed contact, the second phase B normally-closed contact and the second phase C normally-closed contact are respectively connected with the second phase A normally-closed contact and the second phase A normally-closed contact in parallel, the first phase B normally-closed contact is respectively connected with the second phase B normally-closed contact and the second phase B normally-closed contact in series, the first phase C normally-closed contact is respectively connected with the second phase C normally-closed contact and the second phase C normally-closed contact in series, the second phase A normally-closed contact, the second phase B normally-closed contact and the second phase C normally-closed contact are respectively connected with the second phase A normally-closed contact and the second phase B normally-closed contact in parallel, and the second phase C normally-closed contact are respectively connected with each other in series; the first coil is in linkage with the second A-phase normally-closed contact, the second B-phase normally-closed contact, the second C-phase normally-closed contact, the second A-phase normally-open contact, the second B-phase normally-open contact and the second C-phase normally-open contact, and the first coil is used for being electrified when at least one of the second A-phase normally-closed contact, the second B-phase normally-closed contact and the second C-phase normally-closed contact is conducted and at least one of the second A-phase normally-open contact, the second B-phase normally-open contact and the second C-phase normally-open contact is conducted.
Optionally, the control unit includes: a time relay, the time relay comprising: the second coil is connected with the second A-phase normally-closed contact, the second B-phase normally-closed contact and the second C-phase normally-closed contact in series respectively, the second coil is linked with the normally-open contact, and the first normally-open contact is connected with the first coil in series.
Optionally, the switching unit includes: the second A-phase coil is in linkage with the third A-phase normally-closed contact, the second B-phase coil is in linkage with the third B-phase normally-closed contact, and the second C-phase coil is in linkage with the third C-phase normally-closed contact; the second A-phase coil is connected with the first A-phase normally open contact in series, the second B-phase coil is connected with the first B-phase normally open contact in series, the second C-phase coil is connected with the first C-phase normally open contact in series, the third A-phase normally closed contact is connected with the first A-phase coil in series, the third B-phase normally closed contact is connected with the first B-phase coil in series, and the third C-phase normally closed contact is connected with the first C-phase coil in series.
Optionally, the control unit further includes: the indicator lamp is linked with the first coil and is used for being conducted when the first coil is electrified.
Optionally, the first intermediate relay further includes: the first coil and the second normally open contact are linked; the control unit further includes: a second intermediate relay, the second intermediate relay comprising: the third coil is respectively in linkage with the third normally open contact and the fourth normally open contact; the second normally open contact and the third normally open contact are connected in parallel, the third coil is connected in series with the second normally open contact and the third normally open contact respectively, and the fourth normally open contact is connected in series with the indicator lamp.
Optionally, the control unit further includes: and the reset switch is respectively connected with the second normally open contact and the third normally open contact in series.
Optionally, the circuit breaker protection circuit further includes: and the power supply end of the power supply is respectively connected with the power utilization end of the control unit and the power utilization end of the switch unit.
The technical scheme provided by the disclosure can comprise the following beneficial effects:
when at least one phase of the circuit breaker is disconnected and at least one phase of the circuit breaker is conducted, the problem that three phases of the circuit breaker are inconsistent is indicated, the control unit transmits control signals to the switch unit according to signals of the output end of the circuit breaker, and meanwhile, the output end of the circuit breaker also transmits the control signals to the switch unit, so that the switch unit disconnects the three phases of the circuit breaker under the control of the control unit and the circuit breaker, and the problem of damage to the circuit breaker and the problem of circuit safety are avoided; the protection circuit utilizes the control unit and the circuit breaker to control the switch unit simultaneously, so that double protection is realized, misoperation of the switch unit caused by faults such as moisture, short circuit and the like of a certain device is avoided, and stable operation of the circuit breaker is ensured while protection of the circuit breaker is realized.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a schematic circuit diagram of a circuit breaker protection circuit according to an embodiment of the disclosure;
fig. 2 is a schematic circuit diagram of a circuit breaker protection circuit according to an embodiment of the disclosure;
fig. 3 is a schematic circuit diagram of a circuit breaker in a circuit breaker protection circuit according to an embodiment of the present disclosure;
as shown in the figure: 1. a control unit;
11. the first intermediate relay comprises a first intermediate relay body 111, a first coil 112, a first A-phase normally-open contact 113, a first B-phase normally-open contact 114, a first C-phase normally-open contact 115 and a second normally-open contact;
12. a time relay 121, a second coil 122, a first normally open contact;
13. an indicator light;
14. the second intermediate relay, 141, the third coil, 142, the third normally open contact, 143 and the fourth normally open contact;
15. a reset switch;
2. the switching unit, 21, the second A phase coil, 22, the second B phase coil, 23, the second C phase coil, 24, the third A phase normally-closed contact, 25, the third B phase normally-closed contact, 26 and the third C phase normally-closed contact;
3. the circuit breaker comprises a circuit breaker 301, a first A-phase coil 302, a first A-phase normally-closed contact 303, a first B-phase coil 304, a first B-phase normally-closed contact 305, a first C-phase coil 306, a first C-phase normally-closed contact 307, a second A-phase normally-closed contact 308, a second B-phase normally-closed contact 309, a second C-phase normally-closed contact 310, a second A-phase normally-open contact 311, a second B-phase normally-open contact 312 and a second C-phase normally-open contact;
4. And a power supply.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the disclosure include all alternatives, modifications, and equivalents as may be included within the spirit and scope of the appended claims.
As shown in fig. 1, an embodiment of the disclosure proposes a circuit breaker protection circuit, including a control unit 1 and a switch unit 2, where an input end of the control unit 1 is connected to an output end of the circuit breaker 3, the control unit 1 is configured to output a signal when at least one phase of the circuit breaker 3 is turned off and at least one phase is turned on, an input end of the switch unit 2 is respectively connected to an output end of the circuit breaker 3 and an output end of the control unit 1, an output end of the switch unit 2 is connected to an input end of the circuit breaker 3, and the switch unit 2 is configured to disconnect three phases of the circuit breaker 3 when at least one phase of the circuit breaker 3 is turned off and the control unit 1 outputs a signal.
It can be understood that when at least one phase of the circuit breaker 3 is disconnected and at least one phase is conducted, it is indicated that the circuit breaker 3 has a problem of three-phase inconsistency, the control unit 1 transmits a control signal to the switch unit 2 according to a signal of an output end of the circuit breaker 3, and meanwhile, the output end of the circuit breaker 3 also transmits a control signal to the switch unit 2, so that the switch unit 2 disconnects the three phases of the circuit breaker 3 under the control of the control unit 1 and the circuit breaker 3, and further, the three-phase inconsistency protection of the circuit breaker 3 is realized, and the damage problem and the circuit safety problem of the circuit breaker 3 are avoided.
The protection circuit utilizes the control unit 1 and the breaker 3 to control the switch unit 2 at the same time, so that double protection is realized, and misoperation of the switch unit 2 caused by faults such as moisture, short circuit and the like of a certain device is avoided, thereby ensuring stable operation of the breaker 3 while protecting the breaker 3.
The three-phase inconsistency of the circuit breaker 3 means that the circuit breaker 3 is in a state in which at least one phase is opened and at least one phase is closed, and the at least one phase is opened and at least one phase is closed, or the one-phase coil and the two-phase coil of the circuit breaker 3 are opened.
The three phases of the circuit breaker 3 are an a-phase coil, a B-phase coil, and a C-phase coil of the circuit breaker 3.
When at least one phase of the circuit breaker 3 is disconnected and at least one phase is conducted, the control unit 1 outputs a signal to the switch unit 2, meanwhile, the circuit breaker 3 also outputs a signal to the switch unit 2, at this time, the switch unit 2 can disconnect three phases of the circuit breaker 3, when all three phases of the circuit breaker 3 are conducted, the circuit breaker 3 cannot output a signal to the switch unit 2, at this time, even if a certain device causes the control unit 1 to output a signal to the switch unit 2 due to faults such as humidity and short circuit, the switch unit 2 cannot disconnect the three phases of the circuit breaker 3, thereby avoiding misoperation of the switch unit 2 and further ensuring stable operation of the circuit breaker 3.
The specific type of the control unit 1 may be set according to actual needs, and the control unit 1 may be, for example, a control chip having a processor, a memory, or other computing processing devices, or may be a control circuit having a plurality of linkage devices.
The specific type of the switch unit 2 may be set according to actual needs, and the switch unit 2 may be, for example, a control chip with a processor, an actuator, or other computing executing devices, or may be a control circuit with a plurality of linkage devices.
As shown in fig. 2, in some embodiments, the control unit 1 includes a first intermediate relay 11, the first intermediate relay 11 includes a first coil 111, a first a-phase normally open contact 112, a first B-phase normally open contact 113, and a first C-phase normally open contact 114, the first coil 111 is in linkage with an output end of the circuit breaker 3, the first coil 111 is in linkage with the first a-phase normally open contact 112, the first B-phase normally open contact 113, and the first C-phase normally open contact 114, the first a-phase normally open contact 112, the first B-phase normally open contact 113, and the first C-phase normally open contact 114 are in parallel connection, and the first a-phase normally open contact 112, the first B-phase normally open contact 113, and the first C-phase normally open contact 114 are in linkage with an input end of the switching unit 2, respectively;
The first coil 111 is used for being electrified when at least one phase of the circuit breaker 3 is opened and at least one phase is conducted, and the switching unit 2 is used for opening three phases of the circuit breaker 3 when at least one phase of the circuit breaker 3 is opened and the first a-phase normally-open contact 112, the first B-phase normally-open contact 113 and the first C-phase normally-open contact 114 are all conducted.
It can be understood that when at least one phase of the circuit breaker 3 is opened and at least one phase of the circuit breaker is turned on, it indicates that the circuit breaker 3 has a problem of inconsistent three phases, at this time, the switch unit 2 receives a control signal transmitted by the circuit breaker 3, and the first coil 111 is powered on simultaneously, wherein, because the first coil 111 is linked with the first a-phase normally open contact 112, the first B-phase normally open contact 113 and the first C-phase normally open contact 114 respectively, the first a-phase normally open contact 112, the first B-phase normally open contact 113 and the first C-phase normally open contact 114 are turned on after the first coil 111 is powered on, and further the switch unit 2 also receives a control signal transmitted by the control unit 1, thereby, the switch unit 2 cuts off the three phases of the circuit breaker 3 under the control of the first a-phase normally open contact 112, the first B-phase normally open contact 113, the first C-phase normally open contact 114 and the circuit breaker 3, and further three-phase inconsistent protection of the circuit breaker 3 is realized, and the problem of circuit safety of the circuit breaker 3 is avoided.
The protection circuit controls the switch unit 2 by using the first a-phase normally-open contact 112, the first B-phase normally-open contact 113, the first C-phase normally-open contact 114 and the circuit breaker 3 at the same time, so as to realize double protection, and avoid misoperation of the switch unit 2 caused by faults such as dampness and short circuit of one of the first a-phase normally-open contact 112, the first B-phase normally-open contact 113, the first C-phase normally-open contact 114 and the like, thereby ensuring stable operation of the circuit breaker 3 while protecting the circuit breaker 3.
The intermediate relay is an electric appliance used as a control switch, and comprises a coil and a contact, wherein the coil is linked with the contact, when the contact is a normally open contact, the normally open contact is conducted when the coil is electrified, the normally open contact is disconnected when the coil is deenergized, when the contact is a normally closed contact, the normally closed contact is disconnected when the coil is electrified, and the normally closed contact is conducted when the coil is deenergized.
The first coil 111 is a coil, and the first a-phase normally open contact 112, the first B-phase normally open contact 113 and the first C-phase normally open contact 114 are all normally open contacts, that is, when the first coil 111 is powered on, the first a-phase normally open contact 112, the first B-phase normally open contact 113 and the first C-phase normally open contact 114 are turned on, and when the first coil 111 is powered off, the first a-phase normally open contact 112, the first B-phase normally open contact 113 and the first C-phase normally open contact 114 are turned off.
The first a-phase normally open contact 112 is a contact corresponding to the circuit breaker 3A, the first B-phase normally open contact 113 is a contact corresponding to the circuit breaker 3B, and the first C-phase normally open contact 114 is a contact corresponding to the circuit breaker 3C.
As shown in fig. 2 and 3, in some embodiments, the circuit breaker 3 includes a first a-phase coil 301, a first a-phase normally-closed contact 302, a first B-phase coil 303, a first B-phase normally-closed contact 304, a first C-phase coil 305, and a first C-phase normally-closed contact 306, the first a-phase coil 301 is linked with the first a-phase normally-closed contact 302, the first B-phase coil 303 is linked with the first B-phase normally-closed contact 304, the first C-phase coil 305 is linked with the first C-phase normally-closed contact 306, the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304, and the first C-phase normally-closed contact 306 are connected in parallel, the first a-phase normally-closed contact 302 is connected in series with the first a-phase normally-open contact 112, the first B-phase normally-closed contact 304 is connected in series with the first B-phase normally-closed contact 113, and the first C-phase normally-closed contact 306 is connected in series with the first C-phase normally-closed contact 114;
the switching unit 2 is configured to open three phases of the circuit breaker 3 when at least one of the first a-phase normally open contact 112, the first B-phase normally open contact 113 and the first C-phase normally open contact 114 is turned on, and the first a-phase normally open contact 112, the first B-phase normally open contact 113 and the first C-phase normally open contact 114 are all turned on.
It will be understood that when at least one of the first a-phase coil 301, the first B-phase coil 303, and the first C-phase coil 305 is opened and at least one is turned on, this indicates that the circuit breaker 3 has a problem of three-phase inconsistency, and that since the first a-phase coil 301 is linked with the first a-phase normally-closed contact 302, the first B-phase coil 303 is linked with the first B-phase normally-closed contact 304, the first C-phase coil 305 is linked with the first C-phase normally-closed contact 306, at least one of the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304, and the first C-phase normally-closed contact 306 is turned on, and that since the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304, and the first C-phase normally-closed contact 306 are connected in parallel, the paths between both ends of the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304, and the first C-phase normally-closed contact 306 are turned on.
Moreover, when at least one of the first a-phase coil 301, the first B-phase coil 303, and the first C-phase coil 305 is opened and at least one is turned on, the first coil 111 is energized and causes the first a-phase normally-open contact 112, the first B-phase normally-open contact 113, and the first C-phase normally-open contact 114 to be turned on, and since the first a-phase normally-open contact 302 is connected in series with the first a-phase normally-open contact 112, the first B-phase normally-open contact 304 is connected in series with the first B-phase normally-open contact 113, the first C-phase normally-open contact 306 is connected in series with the first C-phase normally-open contact 114, the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304, the first C-phase normally-closed contact 306, and the first B-phase normally-closed contact 113 are all turned on.
Therefore, the control of the switch unit 2 is realized, the three-phase inconsistent protection of the switch unit 2 to the breaker 3 is ensured, the damage problem and the circuit safety problem of the breaker 3 are avoided, double protection is realized, and the misoperation of the switch unit 2 caused by the faults such as the humidity and the short circuit of one of the devices such as the first A-phase normally-open contact 112, the first B-phase normally-open contact 113 and the first C-phase normally-open contact 114 is avoided, so that the breaker 3 is protected, and the stable operation of the breaker 3 is ensured.
The first a-phase coil 301 is a coil in which the circuit breaker 3 is disposed in the main circuit a-phase, the first B-phase coil 303 is a coil in which the circuit breaker 3 is disposed in the main circuit B-phase, and the first C-phase coil 305 is a coil in which the circuit breaker 3 is disposed in the main circuit C-phase.
The first a-phase coil 301, the first B-phase coil 303 and the first C-phase coil 305 are coils, and the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304 and the first C-phase normally-closed contact 306 are normally-closed contacts, wherein when the first a-phase coil 301, the first B-phase coil 303 and the first C-phase coil 305 are powered on, the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304 and the first C-phase normally-closed contact 306 are disconnected, and when the first a-phase coil 301, the first B-phase coil 303 and the first C-phase coil 305 are powered off, the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304 and the first C-phase normally-closed contact 306 are conducted.
As shown in fig. 2, in some embodiments, the circuit breaker 3 further includes a second a-phase normally-closed contact 307, a second B-phase normally-closed contact 308, a second C-phase normally-closed contact 309, a second a-phase normally-open contact 310, a second B-phase normally-open contact 311, and a second C-phase normally-open contact 312, the first a-phase coil 301 is respectively linked with the second a-phase normally-closed contact 307 and the second a-phase normally-open contact 310, the first B-phase coil 303 is respectively linked with the second B-phase normally-closed contact 308 and the second B-phase normally-open contact 311, the first C-phase coil 305 is respectively linked with the second C-phase normally-closed contact 309 and the second C-phase normally-open contact 312, the second a-phase normally-open contact 308, the second B-phase normally-open contact 311, and the second C-phase normally-open contact 312 are in parallel, the second a-phase normally-closed contact 307 and the second a-phase normally-open contact 310 are in series, the second B-phase normally-closed contact 308 and the second B-phase normally-open contact 311 are in series, and the second C-phase normally-open contact 309 are in series;
the first coil 111 is in linkage with the second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308, the second C-phase normally-closed contact 309, the second a-phase normally-open contact 310, the second B-phase normally-open contact 311 and the second C-phase normally-open contact 312, and the first coil 111 is used for conducting at least one of the second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308 and the second C-phase normally-closed contact 309 and obtaining electricity when at least one of the second a-phase normally-open contact 310, the second B-phase normally-open contact 311 and the second C-phase normally-open contact 312 is conducted.
It will be appreciated that when at least one of the first a-phase coil 301, the first B-phase coil 303, and the first C-phase coil 305 is open and at least one is conductive, this indicates that the circuit breaker 3 has a problem of three-phase inconsistency, and that since the first a-phase coil 301 is linked with the second a-phase normally-closed contact 307 and the second a-phase normally-open contact 310, respectively, the first B-phase coil 303 is linked with the second B-phase normally-closed contact 308 and the second B-phase normally-open contact 311, respectively, the first C-phase coil 305 is linked with the second C-phase normally-closed contact 309 and the second C-phase normally-open contact 312, respectively, so that at least one of the second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308, and the second C-phase normally-closed contact 309 is conductive, while at least one of the second a-phase normally-closed contact 310, the second B-phase normally-open contact 311, and the second C-phase normally-open contact 312 is conductive.
Moreover, since the second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308 and the second C-phase normally-closed contact 309 are connected in parallel, the paths between the two ends of the second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308 and the second C-phase normally-closed contact 309 are conducted, and since the second a-phase normally-open contact 310, the second B-phase normally-open contact 311 and the second C-phase normally-open contact 312 are connected in parallel, the paths between the two ends of the second a-phase normally-open contact 310, the second B-phase normally-open contact 311 and the second C-phase normally-open contact 312 are conducted, and since the second a-phase normally-closed contact 307 and the second a-phase normally-open contact 310 are connected in series, the second B-phase normally-closed contact 308 and the second B-phase normally-open contact 311 are connected in series, the paths formed by the second a-phase normally-closed contact 308, the second B-phase normally-closed contact 309 and the second C-phase normally-open contact 309 and the second a-phase normally-open contact 310, the second B-phase normally-open contact 311 and the second C-phase normally-open contact 312 are conducted.
Therefore, when the second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308, the second C-phase normally-closed contact 309, the second a-phase normally-open contact 310, the second B-phase normally-open contact 311 and the second C-phase normally-open contact 312 are conducted, the first coil 111 is electrified, so that the first a-phase normally-open contact 112, the first B-phase normally-open contact 113 and the first C-phase normally-open contact 114 are conducted, and the control of the switch unit 2 is realized by matching the conduction of the first a-phase normally-open contact 112, the first B-phase normally-open contact 113 and the first C-phase normally-open contact 114, the three-phase inconsistent protection of the switch unit 2 to the circuit breaker 3 is ensured, the damage problem and the circuit safety problem of the circuit breaker 3 are avoided, and the double protection is also realized, the misoperation of the switch unit 2 caused by the faults such as the moisture, the short circuit and the like of one device in the first a-phase normally-open contact 112, the first B-phase normally-open contact 113, the first C-phase normally-open contact 114 and the like is avoided, and the stable operation of the circuit breaker 3 is ensured while the protection of the circuit breaker 3 is realized.
The second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308, and the second C-phase normally-closed contact 309 are normally-closed contacts, and the second a-phase normally-open contact 310, the second B-phase normally-open contact 311, and the second C-phase normally-open contact 312 are normally-open contacts, wherein when the first a-phase coil 301, the first B-phase coil 303, and the first C-phase coil 305 are energized, the second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308, and the second C-phase normally-closed contact 309 are opened, and the second a-phase normally-open contact 310, the second B-phase normally-open contact 311, and the second C-phase normally-open contact 312 are all closed, and when the first a-phase coil 301, the first B-phase coil 303, and the first C-phase coil 305 are de-energized, the second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308, and the second C-phase normally-closed contact 309 are opened, and the second a-phase normally-open contact 310, the second B-phase normally-open contact 311, and the second C-phase normally-open contact 312 are all opened.
As shown in fig. 2, in some embodiments, the control unit 1 includes a time relay 12, the time relay 12 includes a second coil 121 and a first normally open contact 122, the second coil 121 is connected in series with a second a-phase normally closed contact 307, a second B-phase normally closed contact 308, and a second C-phase normally closed contact 309, respectively, the second coil 121 is linked with the normally open contact, and the first normally open contact 122 is connected in series with the first coil 111.
It will be appreciated that when at least one of the first a-phase coil 301, the first B-phase coil 303, and the first C-phase coil 305 is opened and at least one is closed, this indicates that the circuit breaker 3 has a problem of three-phase inconsistency, so that the paths formed by the second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308, and the second C-phase normally-closed contact 309, and the second a-phase normally-open contact 310, the second B-phase normally-open contact 311, and the second C-phase normally-open contact 312 are closed, and the second coil 121 is connected in series with the second a-phase normally-closed contact 307, the second B-phase normally-closed contact 308, and the second C-phase normally-closed contact 309, respectively, so that the second coil 121 is energized, thereby making the first normally-open contact 122 conductive, and at the same time, the first coil 111 is energized, so that the first a-phase normally-open contact 112, the first B-phase normally-open contact 113, and the first C-phase normally-open contact 114 are turned on, due to the first normally-open contact 111 being connected in series.
Therefore, the first A-phase normally open contact 112, the first B-phase normally open contact 113 and the first C-phase normally open contact 114 are conducted in cooperation with the first A-phase normally open contact 112, the first B-phase normally open contact 113 and the first C-phase normally open contact 114 to control the switch unit 2, three-phase inconsistent protection of the switch unit 2 to the circuit breaker 3 is guaranteed, the damage problem and the circuit safety problem of the circuit breaker 3 are avoided, double protection is also achieved, and misoperation of the switch unit 2 caused by moisture, short circuit and other faults of one of the first A-phase normally open contact 112, the first B-phase normally open contact 113, the first C-phase normally open contact 114 and the like is avoided, so that the circuit breaker 3 is protected, and meanwhile, the stable operation of the circuit breaker 3 is guaranteed.
By setting the time relay 12, a certain interval time is provided between the second coil 121 after the second coil is powered on and before the first normally open contact 122 is conducted, so that fluctuation, misoperation and the like in a circuit can be adapted, misoperation of the switch unit 2 is avoided, and stable operation of the circuit breaker 3 is guaranteed while protection of the circuit breaker 3 is achieved.
The time relay 12 is a relay in which when an input action signal is added (or removed), an output circuit thereof needs to generate a jump change (or a contact action) after a predetermined accurate time, and the time relay 12 also includes a coil and a contact, wherein the coil and the contact are linked, when the contact is a normally open contact, the normally open contact is conducted after a predetermined time when the coil is powered on, the normally open contact is disconnected after a predetermined time when the coil is powered off, when the contact is a normally closed contact, the normally closed contact is disconnected after a predetermined time when the coil is powered on, and the normally closed contact is conducted after a predetermined time when the coil is powered off.
The predetermined time in the time relay 12 may be set according to actual needs, which is not limited.
The second coil 121 is a coil, and the first normally open contact 122 is a normally open contact, that is, when the second coil 121 is powered on, the first normally open contact 122 is turned on, and when the second coil 121 is powered off, the first normally open contact 122 is turned off.
As shown in fig. 2 and 3, in some embodiments, the switching unit 2 includes a second a-phase coil 21, a second B-phase coil 22, a second C-phase coil 23, a third a-phase normally-closed contact 24, a third B-phase normally-closed contact 25, and a third C-phase normally-closed contact 26, the second a-phase coil 21 and the third a-phase normally-closed contact 24 are linked, the second B-phase coil 22 and the third B-phase normally-closed contact 25 are linked, and the second C-phase coil 23 and the third C-phase normally-closed contact 26 are linked;
the second a-phase coil 21 is connected in series with the first a-phase normally open contact 112, the second B-phase coil 22 is connected in series with the first B-phase normally open contact 113, the second C-phase coil 23 is connected in series with the first C-phase normally open contact 114, the third a-phase normally closed contact 24 is connected in series with the first a-phase coil 301, the third B-phase normally closed contact 25 is connected in series with the first B-phase coil 303, and the third C-phase normally closed contact 26 is connected in series with the first C-phase coil 305.
It will be appreciated that when at least one of the first a-phase coil 301, the first B-phase coil 303, and the first C-phase coil 305 is open and at least one is closed, this indicates that the circuit breaker 3 has a problem of three-phase inconsistency, and causes the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304, the first C-phase normally-closed contact 306, and the first a-phase normally-open contact 112, the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304, the first C-phase normally-closed contact 306, and the first B-phase normally-open contact 113, and the first a-phase normally-closed contact 302, the first B-phase normally-closed contact 304, the first C-phase normally-closed contact 306, and the first C-phase normally-open contact 114 to be open.
Moreover, since the second a-phase coil 21 and the first a-phase normally open contact 112 are connected in series, the second B-phase coil 22 and the first B-phase normally open contact 113 are connected in series, the second C-phase coil 23 and the first C-phase normally open contact 114 are connected in series, so that the second a-phase coil 21, the second B-phase coil 22 and the second C-phase coil 23 are all powered, and further the third a-phase normally closed contact 24, the third B-phase normally closed contact 25 and the third C-phase normally closed contact 26 are all powered off, and simultaneously, since the third a-phase normally closed contact 24 and the first a-phase coil 301 are connected in series, the third B-phase normally closed contact 25 and the first B-phase coil 303 are connected in series, the third C-phase normally closed contact 26 and the first C-phase coil 305 are connected in series, so that the first a-phase coil 301, the first B-phase coil 303 and the first C-phase coil 305 are all powered off, i.e., the three phases of the circuit breaker 3 are all powered off.
Therefore, the three-phase inconsistent protection of the circuit breaker 3 is realized, the damage problem and the circuit safety problem of the circuit breaker 3 are avoided, the double protection is realized, and the stable operation of the circuit breaker 3 is ensured.
The switch unit 2 may be a trip relay, where the second a-phase coil 21, the second B-phase coil 22, and the second C-phase coil 23 are coils, and the third a-phase normally-closed contact 24, the third B-phase normally-closed contact 25, and the third C-phase normally-closed contact 26 are normally-closed contacts, and when the second a-phase coil 21, the second B-phase coil 22, and the second C-phase coil 23 are energized, the third a-phase normally-closed contact 24, the third B-phase normally-closed contact 25, and the third C-phase normally-closed contact 26 are all opened, and when the second a-phase coil 21, the second B-phase coil 22, and the second C-phase coil 23 are de-energized, the third a-phase normally-closed contact 24, the third B-phase normally-closed contact 25, and the third C-phase normally-closed contact 26 are all turned on.
The second a-phase coil 21 is a coil corresponding to the breaker 3A in the switch unit 2, the second B-phase coil 22 is a coil corresponding to the breaker 3B in the switch unit 2, the second C-phase coil 23 is a coil corresponding to the breaker 3C in the switch unit 2, the third a-phase normally-closed contact 24 is a contact corresponding to the breaker 3A in the switch unit 2, the third B-phase normally-closed contact 25 is a contact corresponding to the breaker 3B in the switch unit 2, and the third C-phase normally-closed contact 26 is a contact corresponding to the breaker 3C in the switch unit 2.
As shown in fig. 2, in some embodiments, the control unit 1 further comprises an indicator light 13, the indicator light 13 being in communication with the first coil 111, the indicator light 13 being configured to be turned on when the first coil 111 is powered.
It can be understood that when at least one phase of the circuit breaker 3 is disconnected and at least one phase is conducted, the circuit breaker 3 is indicated to have the inconsistent problem of three phases, the first coil 111 is electrified, and then the indicator lamp 13 is conducted and emits light, so that the light is utilized to prompt an operator to timely overhaul the circuit breaker 3, and further the higher working efficiency of the circuit breaker 3 is ensured.
It should be noted that the specific type of the indicator lamp 13 may be set according to actual needs, which is not limited.
As shown in fig. 2, in some embodiments, the first intermediate relay 11 further includes a second normally open contact 115, the first coil 111 and the second normally open contact 115 are linked, the control unit 1 further includes a second intermediate relay 14, the second intermediate relay 14 includes a third coil 141, a third normally open contact 142 and a fourth normally open contact 143, the third coil 141 is linked with the third normally open contact 142 and the fourth normally open contact 143, respectively, wherein the second normally open contact 115 and the third normally open contact 142 are connected in parallel, and the third coil 141 is connected in series with the second normally open contact 115 and the third normally open contact 142, respectively, and the fourth normally open contact 143 is connected in series with the indicator lamp 13.
It can be understood that when at least one phase of the circuit breaker 3 is opened and at least one phase is turned on, it indicates that the circuit breaker 3 has a problem of inconsistent three phases, and the first coil 111 is powered, the second normally open contact 115 is turned on due to linkage of the first coil 111 and the second normally open contact 115, and the third coil 141 is connected in series with the second normally open contact 115 and the third normally open contact 142 respectively, so that the third coil 141 is powered, and simultaneously, the third coil 141 is connected in linkage with the third normally open contact 142 and the fourth normally open contact 143 respectively, so that the third normally open contact 142 and the fourth normally open contact 143 are both turned on.
Wherein, through the setting of second normally open contact 115, realize the linkage of first coil 111 and third coil 141, through the setting of third normally open contact 142, realize the auto-lock of third coil 141, through the setting of fourth normally open contact 143, realize the on-off control to pilot lamp 13, from this, through the linkage of first coil 111, third coil 141 and pilot lamp 13, when making first coil 111 get electric, pilot lamp 13 can switch on and give out light, thereby utilize light suggestion operating personnel in time to overhaul circuit breaker 3, and then guarantee the higher work efficiency of circuit breaker 3.
The second normally open contact 115, the third normally open contact 142, and the fourth normally open contact 143 are all normally open contacts, wherein when the first coil 111 is powered on, the second normally open contact 115 is turned on, when the first coil 111 is powered off, the second normally open contact 115 is turned off, and when the third coil 141 is powered on, the third normally open contact 142 and the fourth normally open contact 143 are turned on, and when the third coil 141 is powered off, the third normally open contact 142 and the fourth normally open contact 143 are turned off.
As shown in fig. 2, in some embodiments, the control unit 1 further includes a reset switch 15, the reset switch 15 being connected in series with the second and third normally open contacts 115, 142, respectively.
It can be appreciated that when the first coil 111 is powered on and the reset switch 15 is turned on, the second normally open contact 115 and the third normally open contact 142 are both turned on, and when the reset switch 15 is turned off, the second normally open contact 115 and the third normally open contact 142 are both turned off, so that by setting the reset switch 15, the second normally open contact 115 and the third normally open contact 142 can be turned off after the fault of the circuit breaker 3 is cleared, and then the third coil 141 and the indicator lamp 13 are sequentially turned off, so as to ensure that the protection circuit protects the circuit breaker 3 again.
When the reset switch 15 is pressed, it is in an off state, and after the external force on the reset switch 15 is removed, it uses its own spring to reset, and the reset switch 15 after reset is in an on state. The specific type of the reset switch 15 may be set according to actual needs, which is not limited.
As shown in fig. 2, in some embodiments, the circuit breaker protection circuit further includes a power source 4, and a power supply terminal of the power source 4 is connected to a power utilization terminal of the control unit 1 and a power utilization terminal of the switching unit 2, respectively.
It can be understood that the power supply 4 supplies power to the control unit 1 and the switch unit 2, so that the stable operation of the control unit 1 and the switch unit 2 can be ensured, and the stable protection of the protection circuit to the circuit breaker 3 can be further ensured.
It should be noted that, when the power supply 4 is connected to the control unit 1 and the switch unit 2, as shown in fig. 2, the wiring of the present embodiment may be as follows:
the first end of the first a-phase normally-closed contact 302, the first end of the first B-phase normally-closed contact 304 and the first end of the first C-phase normally-closed contact 306 are respectively connected with the positive pole of the power supply 4, the first end of the first a-phase normally-closed contact 112 is respectively connected with the second end of the first a-phase normally-closed contact 302, the second end of the first B-phase normally-closed contact 304 and the second end of the first C-phase normally-closed contact 306, the first end of the first B-phase normally-open contact 113 is respectively connected with the second end of the first a-phase normally-closed contact 302, the second end of the first B-phase normally-closed contact 304 and the second end of the first C-phase normally-closed contact 306, the first end of the second B-phase coil 22 is connected with the second end of the first a-phase normally-open contact 112, the first end of the second B-phase coil 22 is respectively connected with the second end of the first B-phase normally-closed contact 302, the second end of the first C-phase normally-closed contact 304 and the second end of the second C-phase normally-open contact 306, the first C-phase coil 114 is respectively connected with the second end of the second C-phase coil 23, and the second end of the second C-phase normally-open contact 23 is respectively connected with the second end of the second C-phase coil 4.
The first end of the second coil 121 is connected to the positive pole of the power supply 4, the first end of the second a-phase normally-closed contact 307, the first end of the second B-phase normally-closed contact 308 and the first end of the second C-phase normally-closed contact 309 are connected to the second end of the second coil 121, the first end of the second a-phase normally-open contact 310 is connected to the second end of the second a-phase normally-closed contact 307, the second end of the second B-phase normally-closed contact 308 and the second end of the second C-phase normally-closed contact 309, the first end of the second B-phase normally-open contact 311 is connected to the second end of the second a-phase normally-closed contact 307, the second end of the second B-phase normally-closed contact 308 and the second end of the second C-phase normally-closed contact 309, and the first end of the second C-phase normally-open contact 312 is connected to the second end of the second a-phase normally-closed contact 307, the second end of the second B-phase normally-closed contact 308 and the second end of the second C-phase normally-closed contact 309, the second end of the second a-phase normally-open contact 311 and the second C-phase normally-open contact 312 is connected to the negative pole of the power supply 4, respectively.
The first end of the first normally open contact 122 is connected to the positive pole of the power supply 4, the first end of the first coil 111 is connected to the second end of the first normally open contact 122, and the second end of the first coil 111 is connected to the negative pole of the power supply 4.
The first end of the reset switch 15 is connected to the positive pole of the power supply 4, the first end of the second normally open contact 115 and the first end of the third normally open contact 142 are connected to the second end of the reset switch 15, the first end of the third coil 141 is connected to the second end of the second normally open contact 115 and the second end of the third normally open contact 142, and the second end of the third coil 141 is connected to the negative pole of the power supply 4.
The first end of the indicator light 13 is connected with the positive pole of the power supply 4, the first end of the fourth normally open contact 143 is connected with the second end of the indicator light 13, and the second end of the fourth normally open contact 143 is connected with the negative pole of the power supply 4.
The positive electrode of the power supply 4 may be provided with a switch so as to control the protection circuit, where a specific type of the switch may be set according to actual needs, which is not limited, and the switch may be a switching plate, for example.
It should be noted that in the description of the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.
Claims (10)
1. A circuit breaker protection circuit, comprising:
the input end of the control unit is connected with the output end of the circuit breaker, and the control unit is used for outputting a signal when at least one phase of the circuit breaker is disconnected and at least one phase of the circuit breaker is conducted;
The input end of the switch unit is connected with the output end of the circuit breaker and the output end of the control unit respectively, the output end of the switch unit is connected with the input end of the circuit breaker, and the switch unit is used for disconnecting three phases of the circuit breaker when at least one phase of the circuit breaker is disconnected and the control unit outputs signals.
2. The circuit breaker protection circuit of claim 1, wherein the control unit comprises:
a first intermediate relay, the first intermediate relay comprising: the circuit breaker comprises a first coil, a first A-phase normally-open contact, a first B-phase normally-open contact and a first C-phase normally-open contact, wherein the first coil is in linkage with the output end of the circuit breaker, the first coil is respectively in linkage with the first A-phase normally-open contact, the first B-phase normally-open contact and the first C-phase normally-open contact, the first A-phase normally-open contact, the first B-phase normally-open contact and the first C-phase normally-open contact are in parallel connection, and the first A-phase normally-open contact, the first B-phase normally-open contact and the first C-phase normally-open contact are respectively in linkage with the input end of the switch unit;
the first coil is used for being electrified when at least one phase of the circuit breaker is disconnected and at least one phase of the circuit breaker is conducted, and the switch unit is used for disconnecting three phases of the circuit breaker when at least one phase of the circuit breaker is disconnected and the first A-phase normally open contact, the first B-phase normally open contact and the first C-phase normally open contact are all conducted.
3. The circuit breaker protection circuit of claim 2, wherein the circuit breaker comprises:
the device comprises a first A-phase coil, a first A-phase normally-closed contact, a first B-phase coil, a first B-phase normally-closed contact, a first C-phase coil and a first C-phase normally-closed contact, wherein the first A-phase coil is linked with the first A-phase normally-closed contact, the first B-phase coil is linked with the first B-phase normally-closed contact, the first C-phase coil is linked with the first C-phase normally-closed contact, the first A-phase normally-closed contact, the first B-phase normally-closed contact and the first C-phase normally-closed contact are connected in parallel, the first A-phase normally-closed contact is connected in series with the first A-phase normally-open contact, the first B-phase normally-closed contact is connected in series with the first B-phase normally-open contact, and the first C-phase normally-closed contact is connected in series with the first C-phase normally-closed contact;
the switching unit is used for switching on at least one of the first A-phase normally-open contact, the first B-phase normally-open contact and the first C-phase normally-open contact and switching off three phases of the circuit breaker when the first A-phase normally-open contact, the first B-phase normally-open contact and the first C-phase normally-open contact are all switched on.
4. The circuit breaker protection circuit of claim 3, wherein the circuit breaker further comprises:
The first phase A normally-closed contact, the second phase B normally-closed contact, the second phase C normally-closed contact, the second phase A normally-closed contact, the second phase B normally-closed contact and the second phase C normally-closed contact are respectively connected with the second phase A normally-closed contact and the second phase A normally-closed contact in parallel, the first phase B normally-closed contact is respectively connected with the second phase B normally-closed contact and the second phase B normally-closed contact in series, the first phase C normally-closed contact is respectively connected with the second phase C normally-closed contact and the second phase C normally-closed contact in series, the second phase A normally-closed contact, the second phase B normally-closed contact and the second phase C normally-closed contact are respectively connected with the second phase A normally-closed contact and the second phase B normally-closed contact in parallel, and the second phase C normally-closed contact are respectively connected with each other in series;
the first coil is in linkage with the second A-phase normally-closed contact, the second B-phase normally-closed contact, the second C-phase normally-closed contact, the second A-phase normally-open contact, the second B-phase normally-open contact and the second C-phase normally-open contact, and the first coil is used for being electrified when at least one of the second A-phase normally-closed contact, the second B-phase normally-closed contact and the second C-phase normally-closed contact is conducted and at least one of the second A-phase normally-open contact, the second B-phase normally-open contact and the second C-phase normally-open contact is conducted.
5. The circuit breaker protection circuit of claim 4, wherein the control unit comprises:
a time relay, the time relay comprising: the second coil is connected with the second A-phase normally-closed contact, the second B-phase normally-closed contact and the second C-phase normally-closed contact in series respectively, the second coil is linked with the normally-open contact, and the first normally-open contact is connected with the first coil in series.
6. A circuit breaker protection circuit according to claim 3, wherein the switching unit comprises:
the second A-phase coil is in linkage with the third A-phase normally-closed contact, the second B-phase coil is in linkage with the third B-phase normally-closed contact, and the second C-phase coil is in linkage with the third C-phase normally-closed contact;
the second A-phase coil is connected with the first A-phase normally open contact in series, the second B-phase coil is connected with the first B-phase normally open contact in series, the second C-phase coil is connected with the first C-phase normally open contact in series, the third A-phase normally closed contact is connected with the first A-phase coil in series, the third B-phase normally closed contact is connected with the first B-phase coil in series, and the third C-phase normally closed contact is connected with the first C-phase coil in series.
7. The circuit breaker protection circuit of claim 2, wherein the control unit further comprises:
the indicator lamp is linked with the first coil and is used for being conducted when the first coil is electrified.
8. The circuit breaker protection circuit of claim 7, wherein,
the first intermediate relay further includes: the first coil and the second normally open contact are linked;
the control unit further includes: a second intermediate relay, the second intermediate relay comprising: the third coil is respectively in linkage with the third normally open contact and the fourth normally open contact;
the second normally open contact and the third normally open contact are connected in parallel, the third coil is connected in series with the second normally open contact and the third normally open contact respectively, and the fourth normally open contact is connected in series with the indicator lamp.
9. The circuit breaker protection circuit of claim 8, wherein the control unit further comprises:
and the reset switch is respectively connected with the second normally open contact and the third normally open contact in series.
10. The circuit breaker protection circuit of any one of claims 1-9, further comprising:
and the power supply end of the power supply is respectively connected with the power utilization end of the control unit and the power utilization end of the switch unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310911858.2A CN117117793A (en) | 2023-07-24 | 2023-07-24 | Circuit breaker protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310911858.2A CN117117793A (en) | 2023-07-24 | 2023-07-24 | Circuit breaker protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117117793A true CN117117793A (en) | 2023-11-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310911858.2A Pending CN117117793A (en) | 2023-07-24 | 2023-07-24 | Circuit breaker protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117117793A (en) |
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2023
- 2023-07-24 CN CN202310911858.2A patent/CN117117793A/en active Pending
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