CN209785795U - control circuit of circuit breaker and circuit breaker - Google Patents
control circuit of circuit breaker and circuit breaker Download PDFInfo
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- CN209785795U CN209785795U CN201920318180.6U CN201920318180U CN209785795U CN 209785795 U CN209785795 U CN 209785795U CN 201920318180 U CN201920318180 U CN 201920318180U CN 209785795 U CN209785795 U CN 209785795U
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Abstract
The utility model provides a circuit breaker and control circuit who is used for circuit breaker, the circuit breaker has: a main contact; the auxiliary contact is linked with the main contact and is provided with a first contact point and a second contact point; the ON end is used for receiving a closing instruction, the OFF end is used for receiving an opening instruction, and the common enabling COM end for the closing instruction and the opening instruction; the control circuit comprises a first path, a second path and a third path, and the OFF end is connected to the wire inlet end of the first contact of the auxiliary contact through the first path; the ON end is connected to a wire inlet end of a second contact of the auxiliary contact through a second path; the wire outlet end of the first contact of the auxiliary contact and the wire outlet end of the second contact of the auxiliary contact are connected to the COM end through a third path, so that the wire outlet ends of the first contact and the second contact are both kept in electric communication with the common enabling COM end; and the first path and the second path are configured to form an electric path by only one of the paths at any time, so that the switching-on and switching-off hardware circuit can be prevented from being continuously electrified.
Description
Technical Field
The utility model relates to a circuit breaker and be used for its control circuit, concretely relates to circuit breaker close separating brake signal impulse circuit.
background
The circuit breaker is widely applied to a control system, and the reliability of the electrical connection of the circuit breaker is a primary requirement. One conventional application circuit is shown in fig. 1, in which a main contact is used to open and close a main circuit, and an auxiliary contact is used to access a control circuit to output a control signal.
Fig. 1 shows a circuit breaker switching-on/off control circuit adopted in the prior art. The ON terminal of circuit breaker PK1 is directly connected with the COM terminal of circuit breaker PK1 through a switch contact controlled by a coil PK3 and a coil contact controlled by a coil PK2, and the OFF terminal of circuit breaker PK1 is directly connected with the COM terminal of circuit breaker PK1 through another switch contact controlled by a coil PK3 and another coil contact controlled by a coil PK 2.
therefore, when the main contact P21 of the circuit breaker PK1 needs to be closed, the closing command PK1_ ON is valid, the coil PK2 is powered and attracted, the coil PK3 keeps the initial state, the ON end of the circuit breaker PK1 is communicated with the COM end, so that the COM end receives the closing command, and the circuit breaker PK1 performs the closing operation.
When the main contact P21 of the circuit breaker PK1 needs to be disconnected, the opening command PK1_ OFF is valid, the coil PK3 is electrified and attracted, the coil PK2 keeps an initial state, the OFF end of the circuit breaker PK1 is communicated with the COM end, so that the COM end receives the opening command, and the circuit breaker PK1 executes opening operation;
In the prior art shown in fig. 1, the interlocking of the switching ON and switching OFF commands is realized through the combinational logic of the normally open and normally closed contacts of the coil PK2 and the coil PK3, at most one command enters the COM end of the circuit breaker PK1 at any time, when the switching ON command PK1_ ON is valid, the switching OFF command PK1_ OFF control loop is disconnected by the normally closed auxiliary contact of the coil PK2 switch, and when the switching OFF command PK1_ OFF is valid, the switching ON command PK1_ ON control loop is disconnected by the normally closed auxiliary contact of the coil PK3 switch, so that the interlocking of the two commands is realized.
Normally, since the closing command PK1_ ON and the opening command PK1_ OFF can be realized by software as short-time pulse signals, the coils PK2 and PK3 are not electrified for a long time. However, in an extreme case, a closing instruction PK1_ ON and an opening instruction PK1_ OFF may be in a continuously effective state, so that the circuit breaker PK1 opens and closes the opening hardware circuit to continuously work in a charged state, and the service life of the device is affected.
the switching-on and switching-off coils of the circuit breaker are electrified for a long time, and the coils are easily burnt due to continuous heating, so that the failure of devices is finally caused. Therefore, the control signal of the circuit breaker generally requires to adopt a pulse signal, and the continuous work of the switching-on and switching-off control circuit is avoided.
however, since the switching-on/off signals of the conventional circuit breaker are directly connected to the switching-on/off related control ports of the circuit breaker except for signal interlocking, in some extreme cases, such as emergency shutdown or failure mode, the hard wire is directly connected to the switching-off coil, the switching-on/off signals of the circuit breaker are continuously effective, and there is still a certain risk.
SUMMERY OF THE UTILITY MODEL
The utility model provides a control circuit and circuit breaker for circuit breaker can solve and last level signal probably leads to the risk hidden danger of closing separating brake hardware circuit scaling loss.
The utility model discloses the first aspect provides a control circuit for circuit breaker, wherein the circuit breaker has: a main contact; the auxiliary contact is linked with the main contact and is provided with a first contact point and a second contact point; the ON end is used for receiving a closing instruction, the OFF end is used for receiving an opening instruction, and the common enabling COM end for the closing instruction and the opening instruction; the control circuit includes: the OFF end is connected to the wire inlet end of the first contact of the auxiliary contact through the first path; the ON end is connected to a wire inlet end of a second contact of the auxiliary contact through a second path; the wire outlet end of the first contact of the auxiliary contact and the wire outlet end of the second contact of the auxiliary contact are connected to the COM end through a third path, so that the wire outlet ends of the first contact and the second contact are both kept in electric communication with the common enabling COM end; and the first path and the second path are configured to enable only one path to form an electric path at any time, so that the common enabling COM terminal is selectively connected to the OFF terminal to receive a switching-OFF command or connected to the ON terminal to receive a switching-ON command.
Preferably, the control circuit comprises a first switch and a second switch, the first path comprising a first contact of the first switch and a first contact of the second switch; the second path includes a second contact of the first switch and a second contact of the second switch; wherein: the first switch is configured such that the first contact point thereof is opposite to the open-closed state of the second contact point at any time, and the second switch is configured such that the first contact point thereof is opposite to the open-closed state of the second contact point at any time.
preferably, when the main contact is switched from the open state to the closed state, the auxiliary contact is linked with the main contact so that the second contact of the auxiliary contact is switched from the closed state to the open state; when the main contact is switched from the closed state to the open state, the auxiliary contact and the main contact are linked, so that the first contact of the auxiliary contact is switched from the closed state to the open state.
Preferably, the first switch and the second switch are electromagnetic switches.
Preferably, the closing command and the opening command are short-time pulse signals.
the utility model discloses the second aspect provides a circuit breaker, the circuit breaker includes: a main contact; the auxiliary contact is linked with the main contact and is provided with a first contact point and a second contact point; the ON end is used for receiving a closing instruction, the OFF end is used for receiving an opening instruction, and the common enabling COM end for the closing instruction and the opening instruction; wherein: the OFF end is connected to a wire inlet end of a first contact of the auxiliary contact through a first path; the ON end is connected to a wire inlet end of a second contact of the auxiliary contact through a second path; the wire outlet end of the first contact of the auxiliary contact and the wire outlet end of the second contact of the auxiliary contact are connected to a common enabling COM end; and the first path and the second path are configured to enable only one path to form an electric path at any time, so that the common enabling COM terminal is selectively connected to the OFF terminal to receive a switching-OFF command or connected to the ON terminal to receive a switching-ON command.
preferably, the first path comprises a first contact of the first switch and a first contact of the second switch; the second path includes a second contact of the first switch and a second contact of the second switch; wherein: the first switch is configured such that the first contact point thereof is opposite to the open-closed state of the second contact point at any time, and the second switch is configured such that the first contact point thereof is opposite to the open-closed state of the second contact point at any time.
Preferably, when the main contact is switched from the open state to the closed state, the auxiliary contact is linked with the main contact so that the second contact of the auxiliary contact is switched from the closed state to the open state; when the main contact is switched from the closed state to the open state, the auxiliary contact is linked with the main contact so that the first contact of the auxiliary contact is switched from the closed state to the open state; preferably, the closing command and the opening command are short-time pulse signals.
The utility model discloses a through series circuit breaker's internal switch state signal, then can fine solve the long-time effective hardware risk of losing that leads to of combined floodgate instruction or separating brake instruction.
the auxiliary contact signal is fed back through the internal state of the switch, a control signal pulse circuit is realized, the control signal is cut off after the circuit breaker completes the relevant switching-on and switching-off operations, the relevant instructions are prevented from being continuously effective, and the risk potential danger that the switching-on and switching-off hardware circuit is burnt and damaged possibly caused by the continuous level signal can be solved.
Drawings
The foregoing summary, as well as the following detailed description of the present invention, will be better understood when read in conjunction with the appended drawings. It is to be noted that the figures are only intended as examples of the claimed invention. In the drawings, like reference characters designate the same or similar elements.
Fig. 1 shows a circuit breaker switching-on/off control circuit adopted in the prior art.
fig. 2 shows the circuit breaker and the control circuit thereof according to the preferred embodiment of the present invention, wherein the circuit breaker is in an off state.
Fig. 3 shows the circuit breaker and its control circuit according to the preferred embodiment of the present invention, wherein the circuit breaker is in a closed state.
Detailed Description
The detailed features and advantages of the present invention are described in detail in the detailed description, which is sufficient for anyone skilled in the art to understand the technical content of the present invention and to implement the present invention, and the related objects and advantages of the present invention can be easily understood by those skilled in the art from the description, the claims and the accompanying drawings disclosed in the present specification.
Fig. 2 shows the circuit breaker K1 and its control circuit 10 according to the preferred embodiment of the present invention, wherein the circuit breaker K1 has: a main contact 21; an auxiliary contact 22 linked with the main contact 21; an ON terminal 23 for receiving a closing command K1_ ON, an OFF terminal 24 for receiving an opening command K1_ OFF, and a COM terminal 25 for receiving a closing command K1_ ON or an opening command K1_ OFF to actuate the main contacts 21. Normally, the closing command K1_ ON or the opening command K1_ OFF should be both short-pulse signals.
The OFF terminal 24 is connected to the line end of the first contact 221 of the auxiliary contact 22 via the first path R1 of the control circuit 10; the ON terminal 23 is connected to the line end of the second contact 222 of the auxiliary contact 22 via the second path R2 of the control circuit 10; the outlet terminal of the first contact 221 of the auxiliary contact 22 and the outlet terminal of the second contact 222 of the auxiliary contact 22 are connected to the COM terminal 25 via the third path R3 of the control circuit 10, such that the outlet terminals of the first and second contacts 221, 222 are both in electrical communication with the common enable COM terminal 25.
The control circuit 10 includes a first switch 11 and a second switch 12, and the first switch 11 and the second switch 12 are electromagnetic switches. The first path R1 includes the first contact 111 of the first switch 11 and the first contact 121 of the second switch 12; the second path R2 includes the second contact 112 of the first switch 11 and the second contact 122 of the second switch 12; at any time, the open-close state of the first contact 111 of the first switch 11 is opposite to that of the second contact 112 of the first switch 11, and the open-close state of the first contact 121 of the second switch 12 is opposite to that of the second contact 122 of the second switch 12.
That is, when the first contact 111 of the first switch 11 is switched from the open state to the closed state, the second contact 112 of the first switch 11 is interlocked to be switched from the closed state to the open state synchronously, and vice versa. Similarly, when the first contact 121 of the second switch 12 is switched from the open state to the closed state, the second contact 122 of the second switch 12 is interlocked to be synchronously switched from the closed state to the open state, and vice versa. Here, the linkage between the first contact 111 of the first switch 11 and the second contact 112 of the first switch 11 and the linkage between the first contact 121 of the second switch 12 and the second contact 122 of the second switch 12 may be a mechanical linkage or an electrical linkage.
Therefore, at any time, only one of the first path R1 and the second path R2 can constitute an electrical path, so that the COM terminal 25 is selectively connected to the OFF terminal 24 to receive the opening command K1_ OFF or to the ON terminal 23 to receive the closing command K1_ ON.
The control principle of the control circuit 10 of the circuit breaker K1 of the present invention will be described below with reference to fig. 2 and 3.
Switching-on process
when the closing command K1_ ON is valid, that is, when it is necessary to switch the main contact 21 of the circuit breaker K1 from the open state shown in fig. 2 to the closed state, the second contact 112 of the first switch 11 is switched from the open state shown in the figure to the closed state, and accordingly, the first contact 111 of the first switch 11 is switched from the closed state shown in the figure to the open state, while the open/closed state of each contact of the second switch 12 remains unchanged. At this time, since the second contact 112 of the first switch 11 and the second contact 122 of the second switch 12 are in the closed state, the second path R2 constitutes an electrical path so that the ON terminal 23 of the circuit breaker K1 is electrically connected to the incoming line terminal of the closed second contact 222 of the auxiliary contact 22 via the second path R2.
Therefore, the ON terminal 23 of the circuit breaker K1 is connected to the COM terminal 25 of the circuit breaker K1, and the COM terminal 25 receives the closing command K1_ ON, so that the circuit breaker K1 performs a closing operation, and the main contact 21 is switched from the open state to the closed state. At the same time, the second contact 222 of the auxiliary contact 22 is switched from the closed state to the open state by the mechanical linkage of the auxiliary contact 22 with the main contact 21. Thereafter, since the second contact 222 of the auxiliary contact 22 is in the open state, even if the closing command K1_ ON is still valid, the ON terminal 23 of the breaker K1 and the COM terminal 25 of the breaker K1 are no longer electrically connected.
Brake opening process
When the opening command K1_ OFF is valid, that is, when it is necessary to switch the main contact 21 of the circuit breaker K1 from the closed state shown in fig. 3 to the open state, the first contact 121 of the second switch 12 is switched from the open state shown in the drawing to the closed state, and accordingly, the second contact 122 of the second switch 12 is switched from the closed state shown in the drawing to the open state, while the open/closed state of each contact of the first switch 11 remains unchanged. At this time, since the first contact 121 of the second switch 12 and the first contact 111 of the first switch 11 are in a closed state, the first path R1 constitutes an electrical path so that the OFF end 24 of the circuit breaker K1 is electrically connected to the incoming line end of the closed first contact 221 of the auxiliary contact 22 via the first path R1.
Therefore, the OFF terminal 24 of the circuit breaker K1 is connected to the COM terminal 25 of the circuit breaker K1, and the COM terminal 25 receives the opening command K1_ OFF, so that the circuit breaker K1 performs the opening operation and the main contact 21 is switched from the closed state to the open state. At the same time, the auxiliary contact 22 is mechanically interlocked with the main contact 21, so that the first contact 221 of the auxiliary contact 22 is switched from the closed state to the open state. Thereafter, since the first contact 221 of the auxiliary contact 22 is in the open state, even if the opening command K1_ OFF is still valid, the OFF terminal 24 of the breaker K1 and the COM terminal 25 of the breaker K1 are no longer electrically connected.
The utility model discloses an above-mentioned control circuit can make circuit breaker K1 adopt existing normal control logic of switching on and off, also can convert the continuous level signal that appears under the abnormal conditions into pulse signal. Namely, the state of the circuit breaker K1 is used for feeding back the auxiliary contact, and after the relevant switching-on and switching-off instructions are executed, the signal path is cut off through the linkage of the auxiliary contact and the main contact, so that the switching-on and switching-off coil is prevented from being continuously electrified.
A second aspect of the present invention provides a circuit breaker K1, as shown in fig. 2 and 3. Wherein the circuit breaker K1 has: a main contact 21; the auxiliary contacts 22; the auxiliary contact 22 is linked with the main contact 21; an ON end 23 for receiving a closing command, an OFF end 24 for receiving an opening command, and a COM end 25 for receiving a closing command or an opening command to actuate the main contact; and the OFF terminal 24 is connected to the incoming line terminal of the first contact 221 of the auxiliary contact 22 via the first path R1; the ON end 23 is connected to the line end of the second contact 222 of the auxiliary contact 22 via the second path R2; the outlet end of the first contact 221 of the auxiliary contact 22 and the outlet end of the second contact 222 of the auxiliary contact 22 are connected to the COM terminal 25 via a third path R3, such that the outlet ends of the first contact 221 and the second contact 222 are both in electrical communication with the common enable COM terminal 25; and: at any time, only one of the first path R1 and the second path R2 can constitute an electrical path, so that the COM terminal 25 is selectively connected to the OFF terminal 24 to receive an opening command or to the ON terminal 23 to receive a closing command.
the terms and expressions which have been employed are used as terms of description and not of limitation. The use of such terms and expressions is not intended to exclude any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications may be made within the scope of the claims. Other modifications, variations, and alternatives are also possible. Accordingly, the claims should be looked to in order to cover all such equivalents.
also, it should be noted that, although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention, and that various equivalent changes or substitutions can be made without departing from the spirit of the present invention, and therefore, it is intended that all changes and modifications to the above embodiments within the scope of the appended claims fall within the scope of the appended claims.
Claims (9)
1. a control circuit for a circuit breaker, wherein the circuit breaker has:
A main contact;
the auxiliary contact is linked with the main contact and is provided with a first contact point and a second contact point;
the ON end is used for receiving a closing instruction, the OFF end is used for receiving an opening instruction, and the common enabling COM end for the closing instruction and the opening instruction;
The control circuit includes: a first path, a second path and a third path,
The OFF terminal is connected to a line inlet terminal of the first contact of the auxiliary contact via the first path;
The ON end is connected to a line inlet end of the second contact of the auxiliary contact via the second path;
A wire outlet end of a first contact of the auxiliary contact and a wire outlet end of a second contact of the auxiliary contact are connected to the COM end via the third path, so that the wire outlet ends of the first contact and the second contact are both in electrical communication with the common enable COM end; and is
The first path and the second path are configured to enable only one path to form an electric path at any time, so that the common enabling COM terminal is selectively connected to the OFF terminal to receive a switching-OFF command or connected to the ON terminal to receive a switching-ON command.
2. The control circuit of claim 1,
the control circuit comprises a first switch and a second switch,
the first path includes a first contact of the first switch and a first contact of the second switch;
the second path includes a second contact of the first switch and a second contact of the second switch;
Wherein:
The first switch is configured such that the open/close state of the first contact point is opposite to that of the second contact point at any time, and the second switch is configured such that the open/close state of the first contact point is opposite to that of the second contact point at any time.
3. The control circuit according to claim 1 or 2,
When the main contact is switched from the open state to the closed state, the auxiliary contact is linked with the main contact so that the second contact of the auxiliary contact is switched from the closed state to the open state;
when the main contact is switched from the closed state to the open state, the auxiliary contact and the main contact are linked to enable the first contact of the auxiliary contact to be switched from the closed state to the open state.
4. the control circuit of claim 2, wherein the first switch and the second switch are electromagnetic switches.
5. the control circuit of claim 3, wherein the close command and the open command are short-time pulse signals.
6. A circuit breaker, the circuit breaker comprising:
A main contact;
the auxiliary contact is linked with the main contact and is provided with a first contact point and a second contact point;
The ON end is used for receiving a closing instruction, the OFF end is used for receiving an opening instruction, and the common enabling COM end for the closing instruction and the opening instruction;
Wherein:
the OFF terminal is connected to a line inlet terminal of the first contact of the auxiliary contact via a first path;
The ON end is connected to a wire inlet end of the second contact of the auxiliary contact via a second path;
The wire outlet end of the first contact of the auxiliary contact and the wire outlet end of the second contact of the auxiliary contact are connected to the common enabling COM end;
and the number of the first and second electrodes,
The first path and the second path are configured to enable only one path to form an electric path at any time, so that the common enabling COM terminal is selectively connected to the OFF terminal to receive a switching-OFF command or connected to the ON terminal to receive a switching-ON command.
7. the circuit breaker of claim 6,
the first path includes a first contact of a first switch and a first contact of a second switch;
the second path includes a second contact of the first switch and a second contact of the second switch;
Wherein:
The first switch is configured such that the open/close state of the first contact point is opposite to that of the second contact point at any time, and the second switch is configured such that the open/close state of the first contact point is opposite to that of the second contact point at any time.
8. The circuit breaker according to claim 6 or 7,
when the main contact is switched from the open state to the closed state, the auxiliary contact is linked with the main contact so that the second contact of the auxiliary contact is switched from the closed state to the open state;
When the main contact is switched from the closed state to the open state, the auxiliary contact and the main contact are linked to enable the first contact of the auxiliary contact to be switched from the closed state to the open state.
9. The circuit breaker according to claim 6 or 7, characterized in that the closing command and the opening command are short-time pulse signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920318180.6U CN209785795U (en) | 2019-03-13 | 2019-03-13 | control circuit of circuit breaker and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920318180.6U CN209785795U (en) | 2019-03-13 | 2019-03-13 | control circuit of circuit breaker and circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209785795U true CN209785795U (en) | 2019-12-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920318180.6U Active CN209785795U (en) | 2019-03-13 | 2019-03-13 | control circuit of circuit breaker and circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209785795U (en) |
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2019
- 2019-03-13 CN CN201920318180.6U patent/CN209785795U/en active Active
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