CN216134265U - Three-phase inconsistent protection circuit - Google Patents

Abstract

The utility model provides a three-phase inconsistency protection circuit, which is applied to the three-phase inconsistency protection of a column-type circuit breaker. The column-type circuit breaker includes a trip coil, and the three-phase inconsistency protection circuit includes: a normally closed contact, a first constant open contact, time relay, outlet relay, fourth normally open contact, the time relay includes a first coil and a delay contact, the outlet relay includes a second coil, a second normally open contact and a third normally open contact an open contact; the first end of the third normally open contact is connected to the electrical connection line between the second end of the normally closed contact and the first end of the first normally open contact. This embodiment can avoid the misoperation of the three-phase inconsistency protection circuit of the column circuit breaker, so as to improve the stability of the three-phase inconsistency protection circuit.

Description

Three-phase inconsistent protection circuit

technical field

The utility model relates to the technical field of high-voltage power grids, in particular to a three-phase inconsistency protection circuit.

Background technique

Column-type circuit breakers with split-phase operation are often used in power grids (especially high-voltage power grids with voltage levels of 220kV and above). Column-type circuit breakers are sulfur hexafluoride circuit breakers that use organic or inorganic insulating materials as arc-extinguishing chamber shells and are insulated to ground, such as the so-called porcelain-coated column-type circuit breakers and/or insulating barrel circuit breakers. The shell of the column circuit breaker is an insulating material, mostly insulating ceramics, so the column circuit breaker is defined as an insulated case circuit breaker. Due to manual operation or failure of automatic reclosing when single-jump single-weight mode is adopted, the column circuit breaker may disconnect one phase or two phases during operation, resulting in an abnormal state of inconsistent operation of the column circuit breaker, resulting in zero sequence current, The negative sequence current is larger. If the duration of zero sequence current and negative sequence current is very long, it will cause harm to the generator and motor, interfere with the communication system, and also affect the correct action of the system protection device. In order to reduce the harm caused by the inconsistency of the three phases of the column circuit breaker, the column circuit breaker should be equipped with a three-phase inconsistency protection circuit, and the column circuit breaker with three-phase inconsistency will be withdrawn from the running state to ensure the normal operation of the system. Therefore, the three-phase inconsistent protection circuit is an important circuit in the column circuit breaker. However, in the actual operation process, due to human contact with the test button of the outlet relay of the three-phase inconsistency protection circuit, the three-phase inconsistency protection circuit will malfunction, causing the running column circuit breaker to trip, resulting in a major safety accident. It can be seen that how to effectively avoid the misoperation of the three-phase inconsistency protection circuit of the column circuit breaker and improve the stability of the three-phase inconsistency protection circuit has become an urgent technical problem to be solved.

Utility model content

In order to solve the above technical problems, the utility model provides a three-phase inconsistency protection circuit, which can avoid the misoperation of the three-phase inconsistency protection circuit of the column circuit breaker and improve the stability of the three-phase inconsistency protection circuit.

The embodiment of the present invention provides a three-phase inconsistency protection circuit, the three-phase inconsistency protection circuit is used for the three-phase inconsistency protection of a column type circuit breaker, the column type circuit breaker includes a trip coil, and the three-phase inconsistency protection circuit includes : normally closed contact, first normally open contact, time relay, exit relay, fourth normally open contact, the time relay includes a first coil and a delay contact, the exit relay includes a second coil, a third Two normally open contacts and a third normally open contact; the normally closed contact includes a first end and a second end, the first normally open contact includes a first end and a second end, the first coil It includes a current inflow end and a current outflow end, the delay contact includes a first end and a second end, the second coil includes a current inflow end and a current outflow end, and the second normally open contact includes a first end and a second end, the third normally open contact includes a first end and a second end, the fourth normally open contact includes a first end and a second end; the first end of the normally closed contact is connected to The positive voltage output end of the power supply is connected, the second end of the normally closed contact is connected to the first end of the first normally open contact, and the second end of the first normally open contact is connected to the The current inflow end of the first coil is connected, the current outflow end of the first coil is connected with the negative voltage output end of the power supply; the first end of the delay contact is connected with the positive voltage output end of the power supply, The current inflow end of the second coil is connected to the second end of the delay contact, and the current outflow end of the second coil is connected to the negative voltage output end of the power supply; the second normally open contact The first end of the power supply is connected to the positive voltage output end of the power supply, the second end of the second normally open contact is connected to the current inflow end of the second coil; the first end of the third normally open contact is connected to the current inflow end of the second coil; The end is connected to the electrical connection line between the second end of the normally closed contact and the first end of the first normally open contact, and the second end of the third normally open contact is connected to the first end of the first normally open contact. The first end of the four normally open contacts is connected, the second end of the fourth normally open contact is connected to the current inflow end of the trip coil, and the current outflow end of the trip coil is connected to the negative voltage output of the power supply terminal connection; when the opening and closing states of the three-phase switches of the column circuit breaker are inconsistent, the normally closed contact is conducting, the first normally open contact is conducting, and the fourth normally open contact is conducting The power supply supplies power to the first coil through the normally closed contact and the first normally open contact that are turned on. When the contact is turned on, the power supply supplies power to the second coil through the conductive delay contact. After the second coil obtains the power supply from the power supply, the second normally open contact and the The third normally open contact is conducting, and the power supply supplies power to the trip coil through the conducting normally closed contact, the fourth normally open contact and the third normally open contact, so that all the The column circuit breaker has tripped.

Optionally, the three-phase inconsistency protection circuit further includes: a resistor and a capacitor, the resistor includes a first end and a second end, the capacitor includes a first end and a second end; the first end of the resistor One end is connected to the current outflow end of the trip coil, the first end of the capacitor is connected to the current outflow end of the trip coil, the second end of the resistor is connected to the negative voltage output end of the power supply, The second terminal of the capacitor is connected to the negative voltage output terminal of the power supply.

Optionally, the three-phase inconsistency protection circuit includes: a pressure plate, the pressure plate includes a first end and a second end, the first end of the pressure plate is connected to the current outflow end of the first coil, and the pressure plate has a first end and a second end. The second end is connected to the negative voltage output end of the power supply; when the pressing plate is disconnected, the power supply disconnects the power supply of the first coil.

Optionally, the number of the normally closed contacts and the number of the first normally open contacts are both three, the first ends of the three normally closed contacts are connected, and the three normally closed contacts are connected to each other. The second ends of the three first normally open contacts are connected, the first ends of the three first normally open contacts are connected, and the second ends of the three first normally open contacts are connected; The first end of the closed contact is connected to the positive voltage output end of the power supply, and the second ends of the three normally closed contacts connected to the first end of the three first normally open contacts are connected to the first The second ends of the connected three first normally open contacts are connected to the negative voltage output end of the power supply.

Optionally, the first end of the third normally open contact is connected between the second ends of the three connected normally closed contacts and the first end of the three connected first normally open contacts. the electrical connection between the terminals.

Optionally, the three-phase inconsistency protection circuit further includes: a reset switch, the reset switch includes a first terminal and a second terminal, and the first terminal of the reset switch is connected to the positive voltage output terminal of the power supply, so the reset switch includes a first terminal and a second terminal. The second end of the reset switch is connected to the first end of the second normally open contact, and the second end of the second normally open contact is connected to the second end of the delay contact; when the When the reset switch is turned off, and the second normally open contact is turned on, the three-phase inconsistency protection circuit is reset.

Optionally, the three-phase inconsistency protection circuit further includes: a local opening relay and a local opening switch, the local opening relay includes a third coil and a fifth normally open contact, and the local opening relay includes a third coil and a fifth normally open contact. The gate switch includes a first end and a second end, the third coil includes a current inflow end and a current outflow end; the first end of the local opening switch is connected to the positive voltage output end of the power supply, and the on-site opening switch is connected to the positive voltage output end of the power supply. The second end of the ground switch is connected to the current inflow end of the third coil, the current outflow end of the third coil is connected to the negative voltage output end of the power supply, and the first end of the fifth normally open contact is connected. One end is connected to the positive voltage output end of the power supply, and the second end of the fifth normally open contact is connected to the first end of the fourth normally open contact; when the on-site opening switch is turned on when the power supply supplies power to the third coil, the third coil turns on the fifth normally open contact after obtaining the power supply from the power supply, and the power supply passes through the fifth normally open contact that is turned on. point and the fourth normally open contact to power the trip coil to open the post circuit breaker.

Optionally, the three-phase inconsistency protection circuit further includes a monitoring node, wherein the monitoring node is arranged between the second end of the fourth normally open contact and the current inflow end of the trip coil. electrical connection line.

Optionally, the three-phase inconsistency protection circuit further includes a test node, wherein the test node is arranged at the second end of the third normally open contact and the first end of the fourth normally open contact. the electrical connection between the terminals.

Optionally, the outlet relay further includes an indicator light.

According to the three-phase inconsistency protection circuit provided by the embodiment of the present invention, since the first end of the third normally open contact is no longer connected to the positive voltage output end of the power supply, it is connected to the normally closed auxiliary switch of the column circuit breaker. On the electrical connection line between the second end of the contact and the first end of the first normally open contact of the auxiliary switch of the column circuit breaker, when the opening and closing states of the three-phase switches of the column circuit breaker are consistent , the normally closed contact of the auxiliary switch of the column circuit breaker is disconnected, the first normally open contact of the auxiliary switch of the column circuit breaker is closed, and the first end of the third normally open contact is not connected to When the positive voltage output end of the power supply is connected, the trip coil cannot get power supply, so even if the outlet relay is mis-operated, the trip coil cannot get power supply, the column circuit breaker will not trip, so the column circuit breaker The circuit breaker will not exit the running state, effectively avoiding the misoperation of the three-phase inconsistency protection circuit, thereby effectively improving the stability of the three-phase inconsistency protection circuit of the column circuit breaker, and avoiding the potential safety hazards of the three-phase inconsistency protection circuit.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in,

1 shows a schematic diagram of a circuit structure of a part of a three-phase inconsistency protection circuit according to an embodiment of the present invention;

FIG. 2 shows a schematic diagram of the circuit structure of another part of the three-phase inconsistency protection circuit according to the embodiment of the present invention.

Description of reference numbers:

1. Normally closed contact;

2. The first normally open contact;

3. The first coil;

4. Press plate;

5. The second coil;

6. The second normally open contact;

7. Delay contact;

8. Reset switch;

9. Local opening switch;

10. The third coil;

11. The third normally open contact;

12. The fifth normally open contact;

13. Control room control contacts;

14. The fourth normally open contact;

15. Trip coil;

16. Resistors;

17. Capacitor;

18. Monitoring nodes; and

19. Test node.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the embodiments of the present invention, the specific implementations of the embodiments of the present invention will now be described with reference to the accompanying drawings.

The three-phase inconsistency of the column circuit breaker refers to the non-all-phase operation state of the column circuit breaker when one or two phases are disconnected. During the process, the three-phase contacts are not turned on at the same time, and the column circuit breaker that protects and selects the faulty phase after the single-phase grounding short-circuit of the line will cause the three-phase inconsistent operation state, also known as the non-full-phase operation state. When the line single-phase fault tripping is in the reclosing waiting process or after a certain phase column circuit breaker trips, the column circuit breaker is not reclosed due to the abnormal reclosing device, the column circuit breaker mechanism and other reasons, and the line enters Non-full-phase operating state. In order to reduce the harm caused by the inconsistency of the three phases of the column circuit breaker, the column circuit breaker should be equipped with a three-phase inconsistency protection circuit, and the column circuit breaker with three-phase inconsistency will be withdrawn from the running state to ensure the normal operation of the system. Therefore, the three-phase inconsistent protection circuit is an important circuit in the column circuit breaker. In the existing three-phase inconsistency protection circuit, the first end of the third normally open contact is connected to the positive voltage output end of the power supply. Therefore, the third normally open contact of the third normally open contact of the outlet relay whose trip coil is powered by the power supply is controlled. One end is equipotential with the positive voltage output of the power supply. The potential safety hazard in the existing three-phase inconsistency protection circuit is that when the opening and closing states of the three-phase switches of the column-type circuit breaker are the same, once the outlet relay operates incorrectly, the trip coil is powered, so that the column-type circuit breaker in operation is powered. The circuit breaker has tripped, causing a major safety incident. In view of this, the embodiment of the present invention provides a three-phase inconsistency protection circuit, which is applied to a column circuit breaker. The first end of the third normally open contact in the three-phase inconsistency protection circuit is connected to the power supply in the three-phase inconsistency protection circuit. The positive voltage output terminal is disconnected, and the first end of the third normally open contact is connected to the second end of the normally closed contact of the auxiliary switch of the column circuit breaker and the first normally open of the auxiliary switch of the column circuit breaker The electrical connection between the first ends of the contacts effectively avoids the misoperation of the three-phase inconsistency protection circuit, thereby effectively improving the stability of the three-phase inconsistency protection circuit and avoiding the potential safety hazards of the three-phase inconsistency protection circuit.

Specifically, referring to FIG. 1 and FIG. 2 , the three-phase inconsistency protection circuit in the embodiment of the present application is used for the three-phase inconsistency protection of a column-type circuit breaker. The column-type circuit breaker includes a trip coil 15 . Inconsistency protection circuit includes: normally closed contact 1, first normally open contact 2, time relay, outlet relay, fourth normally open contact 14, the time relay includes first coil 3 and delay contact 7, so The outlet relay includes a second coil 5, a second normally open contact 6 and a third normally open contact 11; the normally closed contact 1 includes a first end and a second end, the first normally open contact 2 It includes a first end and a second end, the fourth normally open contact 14 includes a first end and a second end, the first coil 3 includes a current inflow end and a current outflow end, and the delay contact 7 includes The first end and the second end, the second coil 5 includes a current inflow end and a current outflow end, the second normally open contact 6 includes a first end and a second end, the third normally open contact 11 It includes a first end and a second end; the first end of the normally closed contact 1 is connected to the positive voltage output end of the power supply, and the second end of the normally closed contact 1 is connected to the first normally open contact The first end of the point 2 is connected, the second end of the first normally open contact 2 is connected to the current inflow end of the first coil 3, and the current outflow end of the first coil 3 is connected to the negative terminal of the power supply. The voltage output terminal is connected; the first terminal of the delay contact 7 is connected to the positive voltage output terminal of the power supply, and the current inflow terminal of the second coil 5 is connected to the second terminal of the delay contact 7 , the current outflow terminal of the second coil 5 is connected to the negative voltage output terminal of the power supply; the first terminal of the second normally open contact 6 is connected to the positive voltage output terminal of the power supply, and the second normally open contact 6 is connected to the positive voltage output terminal of the power supply. The second end of the normally open contact 6 is connected to the current inflow end of the second coil 5; the first end of the third normally open contact 11 is connected to the second end of the normally closed contact 1 and all On the electrical connection line between the first ends of the first normally open contact 2, the second end of the third normally open contact 11 is connected to the first end of the fourth normally open contact 14, so The second end of the fourth normally open contact 14 is connected to the current inflow end of the trip coil 15, and the current outflow end of the trip coil 15 is connected to the negative voltage output end of the power supply; When the opening and closing states of the three-phase switches of the switch are inconsistent, the normally closed contact 1 is turned on, the first normally open contact 2 is turned on, and the fourth normally open contact 14 is turned on, and the power The conductive normally closed contact 1 and the first normally open contact 2 supply power to the first coil 3, and the first coil 3 makes the delay contact after obtaining the preset time of the power supply. Point 7 is turned on, the power supply supplies power to the second coil 5 through the conductive delay contact 7, and the second coil 5 obtains the power supply to make the second normally open contact 6 Conduction with the third normally open contact 11, the power supply is connected to the normally closed contact 1, the fourth normally open contact 14 and the third normally open contact 11 for the The trip coil 15 supplies power to trip the pole breaker.

In the embodiment of the present invention, since the first end of the third normally open contact is no longer connected to the positive voltage output end of the power supply, but is connected to the second end of the normally closed contact of the auxiliary switch of the column circuit breaker On the electrical connection line with the first end of the first normally open contact of the auxiliary switch of the column circuit breaker, when the opening and closing states of the three-phase switches of the column circuit breaker are consistent, the column circuit breaker The normally closed contact of the auxiliary switch of the circuit breaker is disconnected, the first normally open contact of the auxiliary switch of the column circuit breaker is closed, and the first end of the third normally open contact is not connected to the positive voltage of the power supply The output terminal is connected, the trip coil cannot get power supply, therefore, even if the outlet relay is mis-operated, the trip coil can not get power supply, the pole type circuit breaker will not trip, so the pole type circuit breaker will not exit the running state , effectively avoiding the misoperation of the three-phase inconsistent protection circuit, thereby effectively improving the stability of the three-phase inconsistent protection circuit of the column circuit breaker, and avoiding the potential safety hazards of the three-phase inconsistent protection circuit.

In this embodiment, the normally closed contact 1 can be understood as a contact that is in a closed state when the auxiliary switch of the column circuit breaker is not powered, and the first normally open contact 2 can be understood as Contacts that are in an open state when the auxiliary switch of the column circuit breaker is not powered. The time relay can be understood as an automatic control electrical appliance that uses the electromagnetic principle or the mechanical action principle to make the delay contact close or open. The time relay includes a first coil 3 and a time delay contact 7 . The second normally open contact 6 can be understood as a contact in an open state when the second coil 5 of the outlet relay is not powered. The third normally open contact 11 can be understood as a contact in an open state when the second coil 5 of the outlet relay is not powered by a power supply. The fourth normally open contact 14 can be understood as a contact in an open state when the auxiliary switch of the column circuit breaker is not powered by the power supply. Wherein, the trip coil 15 is the trip coil of the column circuit breaker.

In some optional embodiments, the outlet relay includes an indicator light. Wherein, the indicator light may be a red indicator light or a green indicator light or the like. In this way, when the opening and closing states of the three-phase switches of the column circuit breaker are inconsistent, the outlet relay is powered, and the indicator light of the outlet relay will be on, which can effectively remind the staff that the column circuit breaker appears. An abnormal state where the three-phase actions are inconsistent.

In some optional embodiments, the outlet relay can be a relay with anti-electromagnetic interference, anti-mistouch and a working power greater than 5W. In this way, since the outlet relay has anti-electromagnetic interference, anti-mistouch and working power greater than 5W, the outlet relay can better meet the new regulations of the State Grid, and better ensure the reliability of the column circuit breaker.

In some optional embodiments, the outlet relay may be a relay without a test button or a test button. In this way, human misoperation and collision of the outlet relay can be effectively avoided.

In a specific example, the number of the normally closed contacts 1 and the number of the first normally open contacts 2 are both three, and the first ends of the three normally closed contacts 1 are connected, so The second ends of the three normally closed contacts 1 are connected to each other, the first ends of the three first normally open contacts 2 are connected to each other, and the second ends of the three first normally open contacts 2 are connected to each other. ; The first ends of the three normally closed contacts 1 connected are connected with the positive voltage output end of the power supply, and the second ends of the three normally closed contacts 1 connected are connected with the The first ends of the three first normally open contacts 2 are connected, and the second ends of the connected three first normally open contacts 2 are connected to the negative voltage output end of the power supply. Wherein, the first end of the third normally open contact 11 is connected to the second end of the connected three normally closed contacts 1 and the second end of the connected three first normally open contacts 2 an electrical connection between one end of the wire.

In some optional embodiments, the three-phase inconsistency protection circuit includes: a pressure plate 4 including a first end and a second end, the first end of the pressure plate 4 and the current of the first coil 3 The outflow end is connected, and the second end of the pressure plate 4 is connected to the negative voltage output end of the power supply; when the pressure plate 4 is disconnected, the power supply disconnects the power supply of the first coil 3 . In this way, the pressing plate 4 can be disconnected by the operator pressing the pressing plate 4 , so that the power supply of the first coil 3 can be disconnected.

In some optional embodiments, the three-phase inconsistency protection circuit further includes: a reset switch 8, the reset switch 8 includes a first end and a second end, and the first end of the reset switch 8 is connected to the power supply The positive voltage output terminal is connected, the second terminal of the reset switch 8 is connected to the first terminal of the second normally open contact 6, and the second terminal of the second normally open contact 6 is connected to the delay contact. The second end of point 7 is connected; when the reset switch 8 is turned off, and the second normally open contact 6 is turned on, the three-phase inconsistency protection circuit is reset. Optionally, the reset switch 8 may be a normally closed switch. In this way, when the opening and closing states of the three-phase switches of the column circuit breaker are consistent, the reset switch 8 can be turned off by the operator pressing the reset switch 8, and the three-phase inconsistency protection circuit can be protected. Reset, so as to further effectively ensure the normal operation of the three-phase inconsistency protection circuit.

In some optional embodiments, the three-phase inconsistent protection circuit further includes: a resistor 16 and a capacitor 17, the resistor 16 includes a first end and a second end, and the capacitor 17 includes a first end and a second end The first end of the resistor 16 is connected to the current outflow end of the trip coil 15, the first end of the capacitor 17 is connected to the current outflow end of the trip coil 15, and the first end of the resistor 16 is connected to the current outflow end of the trip coil 15. The two terminals are connected to the negative voltage output terminal of the power supply, and the second terminal of the capacitor 17 is connected to the negative voltage output terminal of the power supply. The resistor 16 and the capacitor 17 enable the trip coil 15 to quickly obtain power supply. Thereby, the resistor 16 and the capacitor 17 can effectively help the trip coil 15 of the column circuit breaker to obtain power more quickly when needed.

In a specific example, the three-phase inconsistency protection circuit includes one resistor 16 and two capacitors 17 , specifically, two parallel-connected capacitors 17 and one resistor 16 are connected in parallel.

In a specific example, the pole-type circuit breaker is operated in separate phases. As shown in FIG. 2 , the pole-type circuit breaker operating for the first phase of the three phases has a corresponding trip coil 15 for the three-phase operation. A pole circuit breaker operating for the second of the three phases has a corresponding trip coil 15 , and a pole circuit breaker operating for the third of the three phases has a corresponding trip coil 15 . In addition, the second end of the trip coil 15 of each phase is connected with a corresponding resistor 16 and a capacitor 17, so that the trip coil 15 on the corresponding phase can obtain power supply more quickly.

In some optional embodiments, the three-phase inconsistency protection circuit further includes: a local opening relay and a local opening switch 9, and the local opening relay includes a third coil 10 and a fifth normally open contact 12. The on-site switch 9 includes a first terminal and a second terminal, and the third coil 10 comprises a current inflow terminal and a current outflow terminal; the first terminal of the on-site switch 9 is connected to the power supply. The positive voltage output terminal of the switch is connected, the second terminal of the on-site switch is connected to the current inflow terminal of the third coil 10, and the current outflow terminal of the third coil 10 is connected to the negative voltage output terminal of the power supply. connection, the first end of the fifth normally open contact 12 is connected to the positive voltage output end of the power supply, and the second end of the fifth normally open contact 12 is connected to the fourth normally open contact 14 The first end is connected; when the on-site opening switch 9 is turned on, the power supply supplies power to the third coil 10, and the third coil 10 obtains the power supply from the power supply to make the fifth normally open contact The point 12 is turned on, and the power supply supplies power to the trip coil through the conductive fifth normally open contact 12 and the fourth normally open contact 14, so as to open the column circuit breaker. Thereby, by operating the on-site opening switch 9 on the spot by the staff, the opening of the column-type circuit breaker can be realized.

In a specific example, the local opening operation refers to the opening operation performed in the switchgear control cabinet of the column circuit breaker. Generally speaking, if it is operated on site, it is generally necessary to turn the transfer switch in the control cabinet to the local place, and then perform the electric operation of opening. When the local opening switch 9 is closed and turned on, the third coil 10 of the local opening relay receives power supply, and the fifth normally open contact 12 of the local opening relay is closed. Four normally open contacts 14, so that the trip coil 15 is powered, and the column circuit breaker is opened to exit the operating state.

In a specific example, the pole-type circuit breaker is operated in separate phases. As shown in FIG. 2 , the pole-type circuit breaker operating for the first phase of the three phases has a corresponding trip coil 15 for the three-phase operation. A pole circuit breaker operating for the second of the three phases has a corresponding trip coil 15 , and a pole circuit breaker operating for the third of the three phases has a corresponding trip coil 15 . In addition, a fifth normally open contact 12 is connected to the first end of the trip coil 15 for each phase, so as to perform a local opening operation of the column circuit breaker.

In some optional embodiments, the three-phase inconsistency protection circuit includes: a control room control contact 13, the control room control contact 13 includes a first end and a second end, and the first end of the control room control contact 13 One end is connected with the control equipment in the control room, the second end of the control contact 13 in the control room is connected with the first end of the fourth normally open contact 14, the second end of the fourth normally open contact 14 The terminal is connected to the input terminal of the trip coil. When the control room control contact 13 is turned on, and the fourth normally open contact 14 is turned on, the trip coil is powered by the control equipment in the control room, so that the column circuit breaker is opened. The control room opening operation refers to the opening operation performed in the control room. Thereby, the operator can operate the control room control contact 13 in the control room opening circuit through the control equipment in the control room, so that the column circuit breaker can be opened.

In a specific example, the pole-type circuit breaker is operated in separate phases. As shown in FIG. 2 , the pole-type circuit breaker operating for the first phase of the three phases has a corresponding trip coil 15 for the three-phase operation. A pole circuit breaker operating for the second of the three phases has a corresponding trip coil 15 , and a pole circuit breaker operating for the third of the three phases has a corresponding trip coil 15 . In addition, the first end of the trip coil 15 for each phase is connected to a control room control contact 13 for control room opening operation of the column circuit breaker.

In some optional embodiments, the three-phase inconsistency protection circuit further includes a test node 19, wherein the test node 19 is disposed between the second end of the third normally open contact 11 and the fourth An electrical connection line between the first ends of the normally open contacts 14 . Thereby, through the test node 19, the three-phase inconsistency protection circuit can be tested effectively.

In a specific example, the pole-type circuit breaker is operated in separate phases. As shown in FIG. 2 , the pole-type circuit breaker operating for the first phase of the three phases has a corresponding test node 19 . A pole circuit breaker operating for the second of the phases has a corresponding test junction 19 , and a pole circuit breaker operating for the third of the three phases has a corresponding test junction 19 .

In some optional embodiments, the three-phase inconsistency protection circuit further includes a monitoring node 18, wherein the monitoring node 18 is disposed between the second end of the fourth normally open contact 14 and the trip coil The current of 15 flows into the electrical connection line between the terminals. Therefore, the monitoring node 18 can effectively monitor the three-phase inconsistency protection circuit.

In a specific example, the pole-type circuit breaker is operated in separate phases. As shown in FIG. 2 , the pole-type circuit breaker operating for the first phase of the three phases has a corresponding monitoring node 18 . A pole circuit breaker operating for the second of the phases has a corresponding monitoring node 18 , and a pole circuit breaker operating for the third of the three phases has a corresponding monitoring node 18 .

It should be understood that although this specification is described according to various embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

The above descriptions are only illustrative specific implementations of the embodiments of the present invention, and are not intended to limit the scope of the embodiments of the present invention. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principles of the embodiments of the present invention shall fall within the protection scope of the embodiments of the present invention.

Claims (10)

1. A three-phase inconsistency protection circuit, characterized in that, the three-phase inconsistency protection circuit is used for the three-phase inconsistency protection of a column circuit breaker, and the column circuit breaker comprises a trip coil (15), and the three-phase circuit breaker includes a trip coil (15). The inconsistent protection circuit includes: a normally closed contact (1), a first normally open contact (2), a time relay, an outlet relay, and a fourth normally open contact (14), and the time relay includes a first coil (3) and a time delay contact (7), the outlet relay includes a second coil (5), a second normally open contact (6) and a third normally open contact (11); The normally closed contact (1) includes a first end and a second end, the first normally open contact (2) includes a first end and a second end, and the first coil (3) includes a current inflow end and a current outflow end, the delay contact (7) includes a first end and a second end, the second coil (5) includes a current inflow end and a current outflow end, the second normally open contact (6) ) includes a first end and a second end, the third normally open contact (11) includes a first end and a second end, and the fourth normally open contact (14) includes a first end and a second end; The first end of the normally closed contact (1) is connected to the positive voltage output end of the power supply, and the second end of the normally closed contact (1) is connected to the first end of the first normally open contact (2) The second end of the first normally open contact (2) is connected to the current inflow end of the first coil (3), and the current outflow end of the first coil (3) is connected to the current inflow end of the power supply. Negative voltage output terminal connection; The first end of the delay contact (7) is connected to the positive voltage output end of the power supply, and the current inflow end of the second coil (5) is connected to the second end of the delay contact (7). connection, the current outflow end of the second coil (5) is connected with the negative voltage output end of the power supply; The first end of the second normally open contact (6) is connected to the positive voltage output end of the power supply, and the second end of the second normally open contact (6) is connected to the second coil (5) The current inflow terminal is connected; The first end of the third normally open contact (11) is connected to the electrical circuit between the second end of the normally closed contact (1) and the first end of the first normally open contact (2). On the connection line, the second end of the third normally open contact (11) is connected to the first end of the fourth normally open contact (14), and the first end of the fourth normally open contact (14) The two ends are connected to the current inflow end of the trip coil (15), and the current outflow end of the trip coil (15) is connected to the negative voltage output end of the power supply; When the opening and closing states of the three-phase switches of the pole-type circuit breaker are inconsistent, the normally closed contact (1) conducts, the first normally open contact (2) conducts, and the fourth normally open The contact (14) is turned on, and the power supply supplies power to the first coil (3) through the conductive normally closed contact (1) and the first normally open contact (2), and the first After a coil (3) obtains the power supply for a preset time, the delay contact (7) is turned on, and the power supply is connected to the second coil (7) through the conductive delay contact (7). 5) Power supply, after the second coil (5) is powered by the power supply, the second normally open contact (6) and the third normally open contact (11) are turned on, and the power supply is passed through the conduction. The normally closed contact (1), the fourth normally open contact (14) and the third normally open contact (11) which are connected to power supply the trip coil (15) so that the column The circuit breaker has tripped. 2. The three-phase inconsistency protection circuit according to claim 1, wherein the three-phase inconsistency protection circuit further comprises: a resistor (16) and a capacitor (17), the resistor (16) comprising a first terminal and a second terminal, the capacitor (17) includes a first terminal and a second terminal; the first terminal of the resistor (16) is connected to the current outflow terminal of the trip coil (15), the capacitor (16) The first end of 17) is connected to the current outflow end of the trip coil (15), the second end of the resistor (16) is connected to the negative voltage output end of the power supply, and the first end of the capacitor (17) is connected to the negative voltage output end of the power supply. The two terminals are connected to the negative voltage output terminal of the power supply. 3. The three-phase inconsistency protection circuit according to claim 1, wherein the three-phase inconsistency protection circuit comprises: a pressing plate (4), the pressing plate (4) comprises a first end and a second end, the The first end of the pressure plate (4) is connected to the current outflow end of the first coil (3), and the second end of the pressure plate (4) is connected to the negative voltage output end of the power supply; when the pressure plate (4) ) is disconnected, the power supply disconnects the power supply of the first coil (3). 4. The three-phase inconsistency protection circuit according to claim 1, wherein the number of the normally closed contacts (1) and the number of the first normally open contacts (2) are both three, so The first ends of the three normally closed contacts (1) are connected, the second ends of the three normally closed contacts (1) are connected, and the third ends of the three first normally open contacts (2) are connected to each other. One end is connected to each other, and the second ends of the three first normally open contacts (2) are connected to each other; the first ends of the three normally closed contacts (1) connected to each other are connected to the positive voltage of the power supply The output end is connected, the second ends of the connected three normally closed contacts (1) are connected with the first ends of the connected three first normally open contacts (2), and the connected The second ends of the three first normally open contacts (2) are connected to the negative voltage output end of the power supply. 5. The three-phase inconsistency protection circuit according to claim 4, wherein the first end of the third normally open contact (11) is connected to the three normally closed contacts (1) that are connected to each other. An electrical connection line between the second end of the contactor and the first ends of the three first normally open contacts (2). 6. The three-phase inconsistency protection circuit according to claim 1, wherein the three-phase inconsistency protection circuit further comprises: a reset switch (8), the reset switch (8) comprising a first end and a second end , the first end of the reset switch (8) is connected to the positive voltage output end of the power supply, and the second end of the reset switch (8) is connected to the first end of the second normally open contact (6) connection, the second end of the second normally open contact (6) is connected with the second end of the delay contact (7); when the reset switch (8) is disconnected, the second The normally open contact (6) is turned on to reset the three-phase inconsistency protection circuit. 7. The three-phase inconsistency protection circuit according to claim 1, wherein the three-phase inconsistency protection circuit further comprises: a local opening relay and a local opening switch (9), the local opening The relay includes a third coil (10) and a fifth normally open contact (12), the on-site opening switch (9) includes a first end and a second end, and the third coil (10) includes a current inflow end and the current outflow end; the first end of the local opening switch (9) is connected to the positive voltage output end of the power supply, and the second end of the local opening switch is connected to the third coil (10) The current inflow end of the third coil (10) is connected to the negative voltage output end of the power supply, and the first end of the fifth normally open contact (12) is connected to the positive voltage of the power supply. The voltage output end is connected, and the second end of the fifth normally open contact (12) is connected with the first end of the fourth normally open contact (14); when the on-site opening switch (9) conducts When turned on, the power supply supplies power to the third coil (10), and after the third coil (10) obtains the power supply from the power supply, the fifth normally open contact (12) is turned on, and the power supply passes through the power supply. The conductive fifth normally open contact (12) and the fourth normally open contact (14) supply power to the trip coil (15) so as to open the column circuit breaker. 8. The three-phase inconsistency protection circuit according to claim 1, wherein the three-phase inconsistency protection circuit further comprises a monitoring node (18), wherein the monitoring node (18) is arranged on the first The electrical connection line between the second end of the four normally open contacts (14) and the current inflow end of the trip coil (15). 9. The three-phase inconsistency protection circuit according to claim 1, wherein the three-phase inconsistency protection circuit further comprises a test node (19), wherein the test node (19) is arranged on the first An electrical connection line between the second end of the three normally open contacts (11) and the first end of the fourth normally open contact (14). 10 . The three-phase inconsistency protection circuit according to claim 1 , wherein the outlet relay further comprises an indicator light. 11 .

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