CN216134265U - Three-phase inconsistent protection circuit - Google Patents
Three-phase inconsistent protection circuit Download PDFInfo
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- CN216134265U CN216134265U CN202121722377.XU CN202121722377U CN216134265U CN 216134265 U CN216134265 U CN 216134265U CN 202121722377 U CN202121722377 U CN 202121722377U CN 216134265 U CN216134265 U CN 216134265U
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Abstract
The utility model provides a three-phase inconsistent protection circuit, which is applied to three-phase inconsistent protection of a column type circuit breaker, wherein the column type circuit breaker comprises a tripping coil, and the three-phase inconsistent protection circuit comprises: the time relay comprises a first coil and a time delay contact, and the outlet relay comprises a second coil, a second normally open contact and a third normally open contact; and the first end of the third normally open contact is connected to an electric 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 inconsistent protection circuit's of three-phase maloperation of column type circuit breaker to improve the inconsistent protection circuit's of three-phase stability.
Description
Technical Field
The utility model relates to the technical field of high-voltage power grids, in particular to a three-phase inconsistent protection circuit.
Background
In power networks, in particular high-voltage networks of the 220kV and above voltage class, phase-split operating column breakers are often used. The column circuit breaker is a sulfur hexafluoride circuit breaker with an organic or inorganic insulating material as the arc extinguishing chamber housing and being insulated against ground, such as the so-called porcelain bushing column and/or insulating cylinder circuit breakers. The case of the column type circuit breaker is an insulating material, and is mostly an insulating ceramic, so the column type circuit breaker is defined as an insulating case type circuit breaker. Due to manual operation or automatic reclosing failure in a single-trip single-weight mode and the like, the column type circuit breaker may break one phase or two phases during operation, so that an abnormal state that actions of the column type circuit breaker are inconsistent is caused, and zero sequence current and negative sequence current are larger. If the duration of the zero sequence current and the negative sequence current is long, the generator and the motor are damaged, interference is generated on a communication system, and meanwhile correct action of a system protection device is influenced. For reducing the harm that causes when column type circuit breaker three-phase is inconsistent, the inconsistent protection circuit of three-phase should be installed to the column type circuit breaker, will appear that the inconsistent column type circuit breaker of three-phase withdraws from the running state, guarantees the normal operating of system. Therefore, three-phase inconsistent protection circuits are important circuits in column circuit breakers. However, in the actual operation process, due to the fact that the test button of the outlet relay of the three-phase inconsistent protection circuit is manually touched by mistake, misoperation can occur to the three-phase inconsistent protection circuit, so that the column type circuit breaker in operation trips, and serious safety accidents are caused. Therefore, how to effectively avoid the misoperation of the three-phase inconsistent protection circuit of the column circuit breaker so as to improve the stability of the three-phase inconsistent protection circuit becomes a technical problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a three-phase inconsistent protection circuit for solving the technical problems, which can avoid the misoperation of the three-phase inconsistent protection circuit of a column type circuit breaker so as to improve the stability of the three-phase inconsistent protection circuit.
The embodiment of the utility model provides a three-phase inconsistent protection circuit, which is used for three-phase inconsistent protection of a column type circuit breaker, wherein the column type circuit breaker comprises a tripping coil, and the three-phase inconsistent protection circuit comprises: the time relay comprises a first coil and a time delay contact, and the outlet relay comprises a second coil, a second normally open contact and a third normally open contact; the normally closed contact comprises a first end and a second end, the first normally open contact comprises a first end and a second end, the first coil comprises a current inflow end and a current outflow end, the time delay contact comprises a first end and a second end, the second coil comprises a current inflow end and a current outflow end, the second normally open contact comprises a first end and a second end, the third normally open contact comprises a first end and a second end, and the fourth normally open contact comprises a first end and a second end; the first end of the normally closed contact is connected with the positive voltage output end of the power supply, the second end of the normally closed contact is connected with the first end of the first normally open contact, the second end of the first normally open contact is connected with the current inflow end of the first coil, and 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 with the second end of the delay contact, and the current outflow end of the second coil is connected with the negative voltage output end of the power supply; the first end of the second normally open contact is connected with the positive voltage output end of the power supply, and the second end of the second normally open contact is connected with the current inflow end of the second coil; the first end of the third normally open contact is connected to an electric connecting line between the second end of the normally closed contact and the first end of the first normally open contact, the second end of the third normally open contact is connected with the first end of the fourth normally open contact, the second end of the fourth normally open contact is connected with the current inflow end of the tripping coil, and the current outflow end of the tripping coil is connected with the negative voltage output end of the power supply; when the state of opening and shutting of column circuit breaker's three-phase switch is inconsistent, the normally closed contact switches on first normally open contact switches on just fourth normally open contact switches on, the power is through switching on the normally closed contact with first normally open contact does first coil power supply, first coil obtains make after the time is predetermine to the power supply the time delay contact switches on, the power is through switching on the time delay contact does the second coil power supply, the second coil obtains make behind the power supply second normally open contact with third normally open contact switches on, the power is through switching on the normally closed contact the fourth normally open contact with third normally open contact does the trip coil power supply, so that the trip of column circuit breaker.
Optionally, the three-phase inconsistent protection circuit further includes: a resistor and a capacitor, the resistor including a first end and a second end, the capacitor including a first end and a second end; the first end of the resistor is connected with the current outflow end of the tripping coil, the first end of the capacitor is connected with the current outflow end of the tripping coil, the second end of the resistor is connected with the negative voltage output end of the power supply, and the second end of the capacitor is connected with the negative voltage output end of the power supply.
Optionally, the three-phase inconsistent protection circuit includes: the pressing plate comprises a first end and a second end, the first end of the pressing plate is connected with the current outflow end of the first coil, and the second end of the pressing plate is connected with the negative voltage output end of the power supply; and when the pressing plate is disconnected, the power supply is disconnected from the first coil.
Optionally, the number of the normally closed contacts and the number of the first normally open contacts are three, first ends of the three normally closed contacts are connected, second ends of the three normally closed contacts are connected, first ends of the three first normally open contacts are connected, and second ends of the three first normally open contacts are connected; the first ends of the three normally closed contacts which are connected with the positive voltage output end of the power supply, the second ends of the three normally closed contacts which are connected with the first ends of the three first normally open contacts which are connected, and the second ends of the three first normally open contacts which are connected with the negative voltage output end of the power supply.
Optionally, the first ends of the third normally open contacts are connected to the electrical connection lines between the second ends of the three connected normally closed contacts and the first ends of the three connected first normally open contacts.
Optionally, the three-phase inconsistent protection circuit further includes: the reset switch comprises a first end and a second end, the first end of the reset switch is connected with the positive voltage output end of the power supply, the second end of the reset switch is connected with the first end of the second normally open contact, and the second end of the second normally open contact is connected with the second end of the delay contact; when the reset switch is switched off, and the second normally open contact is switched on, the three-phase inconsistent protection circuit is reset.
Optionally, the three-phase inconsistent protection circuit further includes: the on-site switching-off relay comprises a third coil and a fifth normally-open contact, the on-site switching-off switch comprises a first end and a second end, and the third coil comprises a current inflow end and a current outflow end; the first end of the local brake-off switch is connected with the positive voltage output end of the power supply, the second end of the local brake-off switch is connected with the current inflow end of the third coil, the current outflow end of the third coil is connected with the negative voltage output end of the power supply, the first end of the fifth normally-open contact is connected with the positive voltage output end of the power supply, and the second end of the fifth normally-open contact is connected with the first end of the fourth normally-open contact; when the local opening switch is switched on, the power supply supplies power to the third coil, the third coil obtains the power supply and then enables the fifth normally-open contact to be switched on, and the power supply supplies power to the tripping coil through the switched-on fifth normally-open contact and the switched-on fourth normally-open contact so as to enable the column type circuit breaker to be opened.
Optionally, the three-phase inconsistent protection circuit further includes a monitoring node, wherein the monitoring node is disposed on an electrical connection line between the second end of the fourth normally open contact and the current inflow end of the trip coil.
Optionally, the three-phase inconsistent protection circuit further includes a test node, where the test node is disposed on an electrical connection line between the second end of the third normally open contact and the first end of the fourth normally open contact.
Optionally, the exit relay further comprises an indicator light.
According to the three-phase inconsistent protection circuit provided by the embodiment of the utility model, because the first end of the third normally open contact is not connected with the positive voltage output end of the power supply any more, but is connected on the electric connecting line between the second end of the normally closed contact of the auxiliary switch of the column breaker and the first end of the first normally open contact of the auxiliary switch of the column breaker, when the open-close states of the three-phase switches of the column breaker are consistent, the normally closed contact of the auxiliary switch of the column breaker is opened, the first normally open contact of the auxiliary switch of the column breaker is closed, the first end of the third normally open contact is not connected with the positive voltage output end of the power supply, the trip coil cannot obtain power supply, therefore, even if the outlet relay is operated by mistake, the trip coil cannot obtain power supply, the column breaker cannot trip, and the column breaker cannot exit the running state, the misoperation of the three-phase inconsistent protection circuit is effectively avoided, so that the stability of the three-phase inconsistent protection circuit of the column type circuit breaker is effectively improved, and the potential safety hazard of the three-phase inconsistent protection circuit is avoided.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein the content of the first and second substances,
FIG. 1 shows a schematic circuit diagram of a portion of a three-phase inconsistent protection circuit of an embodiment of the present invention;
fig. 2 is a schematic circuit diagram showing another part of the three-phase inconsistency protection circuit according to the embodiment of the present invention.
Description of reference numerals:
1. a normally closed contact;
2. a first normally open contact;
3. a first coil;
4. pressing a plate;
5. a second coil;
6. a second normally open contact;
7. a time delay contact;
8. a reset switch;
9. an on-site brake-separating switch;
10. a third coil;
11. a third normally open contact;
12. a fifth normally-on contact;
13. a control room control contact;
14. a fourth normally open contact;
15. a trip coil;
16. a resistor;
17. a capacitor;
18. monitoring the nodes; and
19. and testing the nodes.
Detailed Description
In order to more clearly understand technical features, objects, and effects of embodiments of the present invention, specific 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 a non-full-phase operating state of one or two disconnected phases of the column circuit breaker, for example, a single-phase or two-phase error tripping or stealing tripping of the column circuit breaker, three-phase contacts are not simultaneously connected in a switching-on process of the column circuit breaker, and the column circuit breaker for protecting a selected tripping fault phase after a single-phase ground fault of a line is short-circuited can cause the three-phase inconsistent operating state, which is also called as the non-full-phase operating state. When a reclosing waiting process after a single-phase fault of a line trips or after a certain phase column breaker trips illegally, the column breaker is not reclosed due to reasons such as abnormity of a reclosing device and abnormity of a column breaker mechanism, and the line enters a non-full-phase operation state. For reducing the harm that causes when column type circuit breaker three-phase is inconsistent, the inconsistent protection circuit of three-phase should be installed to the column type circuit breaker, will appear that the inconsistent column type circuit breaker of three-phase withdraws from the running state, guarantees the normal operating of system. Therefore, three-phase inconsistent protection circuits are important circuits in column circuit breakers. In the existing three-phase inconsistent protection circuit, the first end of the third normally open contact is connected with the positive voltage output end of the power supply, so that the first end of the third normally open contact of the outlet relay for controlling the tripping coil to be powered by the power supply is equipotential with the positive voltage output end of the power supply. The potential safety hazard that exists among the inconsistent protection circuit of current three-phase is when the open and shut state of the three-phase switch of column type circuit breaker is unanimous, in case the export relay maloperation, trip coil obtains the power supply promptly for the column type circuit breaker tripping operation in service, thereby cause great incident. In view of this, the embodiment of the present invention provides a three-phase inconsistent protection circuit, which is applied to a column circuit breaker, wherein a first end of a third normally open contact in the three-phase inconsistent protection circuit is disconnected from a positive voltage output end of a power supply in the three-phase inconsistent protection circuit, and a first end of the third normally open contact is connected to an electrical connection line between a second end of a normally closed contact of an auxiliary switch of the column circuit breaker and a first end of a first normally open contact of the auxiliary switch of the column circuit breaker, so as to effectively avoid a misoperation of the three-phase inconsistent protection circuit, thereby effectively improving stability of the three-phase inconsistent protection circuit, and avoiding potential safety hazards of the three-phase inconsistent protection circuit.
Specifically, referring to fig. 1 and 2, a three-phase inconsistent protection circuit in the embodiment of the present application is used for three-phase inconsistent protection of a column type circuit breaker including a trip coil 15, and the three-phase inconsistent protection circuit includes: the relay comprises a normally closed contact 1, a first normally open contact 2, a time relay, an outlet relay and a fourth normally open contact 14, wherein the time relay comprises a first coil 3 and a delay contact 7, and the outlet relay comprises a second coil 5, a second normally open contact 6 and a third normally open contact 11; the normally closed contact 1 comprises a first end and a second end, the first normally open contact 2 comprises a first end and a second end, the fourth normally open contact 14 comprises a first end and a second end, the first coil 3 comprises a current inflow end and a current outflow end, the time delay contact 7 comprises a first end and a second end, the second coil 5 comprises a current inflow end and a current outflow end, the second normally open contact 6 comprises a first end and a second end, and the third normally open contact 11 comprises a first end and a second end; the first end of the normally closed contact 1 is connected with the positive voltage output end of the power supply, the second end of the normally closed contact 1 is connected with the first end of the first normally open contact 2, the second end of the first normally open contact 2 is connected with the current inflow end of the first coil 3, and the current outflow end of the first coil 3 is connected with the negative voltage output end of the power supply; a first end of the delay contact 7 is connected with a positive voltage output end of the power supply, a current inflow end of the second coil 5 is connected with a second end of the delay contact 7, and a current outflow end of the second coil 5 is connected with a negative voltage output end of the power supply; a first end of the second normally open contact 6 is connected with a positive voltage output end of the power supply, and a second end of the second normally open contact 6 is connected with a current inflow end of the second coil 5; a first end of the third normally open contact 11 is connected to an electric connection line between a second end of the normally closed contact 1 and a first end of the first normally open contact 2, a second end of the third normally open contact 11 is connected with a first end of the fourth normally open contact 14, a second end of the fourth normally open contact 14 is connected with a current inflow end of the trip coil 15, and a current outflow end of the trip coil 15 is connected with a negative voltage output end of the power supply; when the open and shut state of column circuit breaker's three-phase switch is inconsistent, normally closed contact 1 switch on first normally open contact 2 switch on just fourth normally open contact 14 switches on, the power is through switching on normally closed contact 1 with first normally open contact 2 does 3 powers of first coil, first coil 3 obtains make after the time is predetermine to the mains operated delay contact 7 switches on, the power is through switching on delay contact 7 does the power of second coil 5, second coil 5 obtains make behind the mains operated second normally open contact 6 with third normally open contact 11 switches on, the power is through switching on normally closed contact 1 fourth normally open contact 14 with third normally open contact 11 does trip coil 15 powers, so that the column circuit breaker trips.
In the embodiment of the utility model, because the first end of the third normally open contact is not connected with the positive voltage output end of the power supply any more, but is connected on the electric connecting line between the second end of the normally closed contact of the auxiliary switch of the column breaker and the first end of the first normally open contact of the auxiliary switch of the column breaker, when the open-close states of the three-phase switch of the column breaker are consistent, the normally closed contact of the auxiliary switch of the column breaker is opened, the first normally open contact of the auxiliary switch of the column breaker is closed, the first end of the third normally open contact is not connected with the positive voltage output end of the power supply, and the tripping coil can not obtain power supply, therefore, even if the outlet relay is operated by mistake, the tripping coil can not obtain power supply, the column breaker can not trip, so that the column breaker can not exit the running state, and the misoperation of the three-phase inconsistent protection circuit can be effectively avoided, therefore, the stability of the three-phase inconsistent protection circuit of the column type circuit breaker is effectively improved, and potential safety hazards of the three-phase inconsistent protection circuit are avoided.
In the present embodiment, the normally closed contact 1 may be understood as a contact in a closed state when the auxiliary switch of the column type circuit breaker is not supplied with power, and the first normally open contact 2 may be understood as a contact in an open state when the auxiliary switch of the column type circuit breaker is not supplied with power. The time relay is understood to be an automatically controlled electrical appliance which uses the electromagnetic principle or the mechanical action principle to close or open the delay contacts. The time relay comprises a first coil 3 and a time delay contact 7. The second normally open contact 6 is understood to be a contact which is in the open state when the second coil 5 of the outlet relay is not supplied with power. The third normally open contact 11 is understood to be a contact which is in the open state when the second coil 5 of the outlet relay is not supplied with power. The fourth normally open contact 14 can be understood as a contact which is in an open state when the auxiliary switch of the column circuit breaker is not powered by the power source. Wherein the trip coil 15 is a trip coil of the column circuit breaker.
In some alternative embodiments, the exit relay includes an indicator light. The indicator light can be a red indicator light or a green indicator light, etc. Therefore, when the opening and closing states of the three-phase switches of the column type circuit breaker are inconsistent, the outlet relay obtains power supply, the indicating lamp of the outlet relay can be lightened, and the column type circuit breaker can be effectively reminded of the abnormal state of inconsistent three-phase actions.
In some alternative embodiments, the exit relay may be a relay with electromagnetic interference resistance, false touch resistance, and an operating power greater than 5W. Therefore, the outlet relay has anti-electromagnetic interference, anti-error collision and working power larger than 5W, so that the outlet relay can better meet the new regulations of national power grids and better ensure the operation reliability of the column type circuit breaker.
In some alternative embodiments, the exit relay may be a relay without a test button or test key. Therefore, misoperation and collision of the outlet relay caused by human 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 three, first ends of the three normally closed contacts 1 are connected, second ends of the three normally closed contacts 1 are connected, first ends of the three first normally open contacts 2 are connected, and second ends of the three first normally open contacts 2 are connected; the first ends of the three normally closed contacts 1 connected with the positive voltage output end of the power supply are connected, the second ends of the three normally closed contacts 1 connected with the first ends of the three first normally open contacts 2 connected with the first ends of the three normally closed contacts 1, and the second ends of the three first normally open contacts 2 connected with the negative voltage output end of the power supply. The first end of the third normally open contact 11 is connected to an electrical connection line between the second ends of the three normally closed contacts 1 connected to each other and the first ends of the three first normally open contacts 2 connected to each other.
In some optional embodiments, the three-phase inconsistent protection circuit includes: the pressing plate 4 comprises a first end and a second end, the first end of the pressing plate 4 is connected with the current outflow end of the first coil 3, and the second end of the pressing plate 4 is connected with the negative voltage output end of the power supply; when the pressing plate 4 is disconnected, the power supply disconnects the power supply of the first coil 3. Thereby, the pressing plate 4 can be turned off by the pressing operation of the worker on the pressing plate 4, so that the power supply is turned off from the first coil 3.
In some optional embodiments, the three-phase inconsistent protection circuit further comprises: the reset switch 8 comprises a first end and a second end, the first end of the reset switch 8 is connected with the positive voltage output end of the power supply, the second end of the reset switch 8 is connected with the first end of the second normally-open contact 6, and 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 switched off, and the second normally open contact 6 is switched on, the three-phase inconsistent protection circuit is reset. Alternatively, the reset switch 8 may be a normally closed switch. Therefore, when the three-phase switches of the column type circuit breaker are in the same opening and closing state, the reset switch 8 can be pressed by a worker to disconnect the reset switch 8, the three-phase inconsistent protection circuit can be reset, and the normal operation of the three-phase inconsistent protection circuit can be further effectively guaranteed.
In some optional embodiments, the three-phase inconsistent protection circuit further comprises: a resistor 16 and a capacitor 17, the resistor 16 comprising a first end and a second end, the capacitor 17 comprising a first end and a second end; a first terminal of the resistor 16 is connected to a current outflow terminal of the trip coil 15, a first terminal of the capacitor 17 is connected to the current outflow terminal of the trip coil 15, a second terminal of the resistor 16 is connected to a negative voltage output terminal of the power supply, and a 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 be quickly powered by the power source. Thereby, the trip coil 15 of the column circuit breaker can be effectively assisted to obtain power supply more quickly when needed by the resistor 16 and the capacitor 17.
In a specific example, the number of the resistors 16 and the number of the capacitors 17 included in the three-phase inconsistent protection circuit are two, and specifically, two capacitors 17 connected in parallel are connected in parallel with one resistor 16.
In a specific example, the column circuit breaker is phase-split operated, as shown in fig. 2, a column circuit breaker operating for a first of the three phases has a corresponding trip coil 15, a column circuit breaker operating for a second of the three phases has a corresponding trip coil 15, and a column circuit breaker operating for a third of the three phases has a corresponding trip coil 15. In addition, a corresponding resistor 16 and a capacitor 17 are connected to the second end of the trip coil 15 for each phase, so that the trip coil 15 on the corresponding phase is supplied with power more quickly.
In some optional embodiments, the three-phase inconsistent protection circuit further comprises: an in-situ breaking relay and an in-situ breaking switch 9, wherein the in-situ breaking relay comprises a third coil 10 and a fifth normally-open contact 12, the in-situ breaking switch 9 comprises a first end and a second end, and the third coil 10 comprises a current inflow end and a current outflow end; a first end of the in-situ brake switch 9 is connected with a positive voltage output end of the power supply, a second end of the in-situ brake switch is connected with a current inflow end of the third coil 10, a current outflow end of the third coil 10 is connected with a negative voltage output end of the power supply, a first end of the fifth normally-open contact 12 is connected with the positive voltage output end of the power supply, and a second end of the fifth normally-open contact 12 is connected with a first end of the fourth normally-open contact 14; when the local opening switch 9 is turned on, the power supply supplies power to the third coil 10, the third coil 10 obtains the power supply to turn on the fifth normally-open contact 12, and the power supply supplies power to the trip coil through the turned-on fifth normally-open contact 12 and the turned-on fourth normally-open contact 14, so that the column type circuit breaker is opened. Therefore, the column type circuit breaker can be opened by operating the on-site opening switch 9 by a worker on site.
In a specific example, the local opening operation refers to opening operation performed in a switch cubicle of a column circuit breaker. Generally, if the control system is operated on site, the change-over switch in the control cubicle is required to be turned on site, and then the electric operation of opening the brake is carried out. When the local opening switch 9 is closed and conducted, the third coil 10 of the local opening relay is powered, the fifth normally open contact 12 of the local opening relay is closed, the trip coil 15 is powered due to the fourth normally open contact 14, and the column type circuit breaker is opened to exit the running state.
In a specific example, the column circuit breaker is phase-split operated, as shown in fig. 2, a column circuit breaker operating for a first of the three phases has a corresponding trip coil 15, a column circuit breaker operating for a second of the three phases has a corresponding trip coil 15, and a column circuit breaker operating for a 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 an in-situ opening operation of the column type circuit breaker.
In some optional embodiments, the three-phase inconsistent protection circuit includes: the control room control contact 13, control room control contact 13 include first end and second end to the first end of control room control contact 13 is connected with the controlgear of control room, the second end of control room control contact 13 with the first end of fourth normally open contact 14 is connected, the second end of fourth normally open contact 14 with the input of trip coil is connected. When the control contact 13 of the control room is conducted and the fourth normally open contact 14 is conducted, the tripping coil is powered by the control equipment of the control room, so that the column type circuit breaker is opened. The control room opening operation refers to opening operation performed in the control room. Therefore, the control room control contact 13 in the control room opening circuit can be operated by a worker through control equipment in the control room, and opening of the column type circuit breaker can be realized.
In a specific example, the column circuit breaker is phase-split operated, as shown in fig. 2, a column circuit breaker operating for a first of the three phases has a corresponding trip coil 15, a column circuit breaker operating for a second of the three phases has a corresponding trip coil 15, and a column circuit breaker operating for a 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 one control room control contact 13 so as to perform a control room opening operation for the column type circuit breaker.
In some optional embodiments, the three-phase inconsistent protection circuit further comprises a test node 19, wherein the test node 19 is disposed on an electrical connection line between the second end of the third normally open contact 11 and the first end of the fourth normally open contact 14. Therefore, the test node 19 can effectively test the three-phase inconsistent protection circuit.
In a specific example, the column circuit breaker is phase-split operated, as shown in fig. 2, a column circuit breaker operating for a first of the three phases has a corresponding test node 19, a column circuit breaker operating for a second of the three phases has a corresponding test node 19, and a column circuit breaker operating for a third of the three phases has a corresponding test node 19.
In some optional embodiments, the three-phase inconsistent protection circuit further comprises a monitoring node 18, wherein the monitoring node 18 is disposed on an electrical connection line between the second end of the fourth normally-open contact 14 and the current inflow end of the trip coil 15. Therefore, the monitoring node 18 can effectively monitor the three-phase inconsistent protection circuit.
In a specific example, the column circuit breaker is phase-split operated, as shown in fig. 2, a column circuit breaker operating for a first of the three phases has a corresponding monitoring node 18, a column circuit breaker operating for a second of the three phases has a corresponding monitoring node 18, and a column circuit breaker operating for a third of the three phases has a corresponding monitoring node 18.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should be able to make equivalent changes, modifications and combinations without departing from the concept and principle of the embodiments of the present invention.
Claims (10)
1. A three-phase inconsistent protection circuit for a column circuit breaker including a trip coil (15), the three-phase inconsistent protection circuit comprising: the time relay comprises a normally closed contact (1), a first normally open contact (2), a time relay, an outlet relay and a fourth normally open contact (14), wherein the time relay comprises a first coil (3) and a time delay contact (7), and the outlet relay comprises a second coil (5), a second normally open contact (6) and a third normally open contact (11);
the normally closed contact (1) comprises a first end and a second end, the first normally open contact (2) comprises a first end and a second end, the first coil (3) comprises a current inflow end and a current outflow end, the time delay contact (7) comprises a first end and a second end, the second coil (5) comprises a current inflow end and a current outflow end, the second normally open contact (6) comprises a first end and a second end, the third normally open contact (11) comprises a first end and a second end, and the fourth normally open contact (14) comprises a first end and a second end;
the first end of the normally closed contact (1) is connected with the positive voltage output end of a power supply, the second end of the normally closed contact (1) is connected with the first end of the first normally open contact (2), the second end of the first normally open contact (2) is connected with the current inflow end of the first coil (3), and the current outflow end of the first coil (3) is connected with the negative voltage output end of the power supply;
the first end of the delay contact (7) is connected with the positive voltage output end of the power supply, the current inflow end of the second coil (5) is connected with the second end of the delay contact (7), and 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 with the positive voltage output end of the power supply, and the second end of the second normally open contact (6) is connected with the current inflow end of the second coil (5);
the first end of the third normally open contact (11) is connected to an electric connection line between the second end of the normally closed contact (1) and the first end of the first normally open contact (2), the second end of the third normally open contact (11) is connected with the first end of the fourth normally open contact (14), the second end of the fourth normally open contact (14) is connected with the current inflow end of the tripping coil (15), and the current outflow end of the tripping coil (15) is connected with the negative voltage output end of the power supply;
when the open-close state of the three-phase switch of the column type circuit breaker is not consistent, the normally closed contact (1) is conducted, the first normally open contact (2) is conducted and the fourth normally open contact (14) is conducted, the power supply is conducted through the normally closed contact (1) and the first normally open contact (2) which are conducted, the first coil (3) supplies power, the first coil (3) obtains the power supply preset time later, the time delay contact (7) is conducted, the power supply is conducted through the time delay contact (7) which is conducted, the second coil (5) supplies power, the second normally open contact (6) and the third normally open contact (11) are conducted after the power supply is obtained, the power supply is conducted through the normally closed contact (1), the fourth normally open contact (14) and the third normally open contact (11) which are conducted, the tripping coil (15) supplies power, to trip the column breaker.
2. The three-phase inconsistent protection circuit of claim 1, further comprising: a resistor (16) and a capacitor (17), the resistor (16) comprising a first end and a second end, the capacitor (17) comprising a first end and a second end; the first end of the resistor (16) is connected with the current outflow end of the trip coil (15), the first end of the capacitor (17) is connected with the current outflow end of the trip coil (15), the second end of the resistor (16) is connected with the negative voltage output end of the power supply, and the second end of the capacitor (17) is connected with the negative voltage output end of the power supply.
3. The three-phase inconsistent protection circuit of claim 1, wherein the three-phase inconsistent protection circuit comprises: the pressing plate (4) comprises a first end and a second end, the first end of the pressing plate (4) is connected with the current outflow end of the first coil (3), and the second end of the pressing plate (4) is connected with the negative voltage output end of the power supply; and when the pressing plate (4) is disconnected, the power supply disconnects the power supply of the first coil (3).
4. The three-phase inconsistent 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 three, first ends of the three normally closed contacts (1) are connected, second ends of the three normally closed contacts (1) are connected, first ends of the three first normally open contacts (2) are connected, and second ends of the three first normally open contacts (2) are connected; the first ends of the three normally closed contacts (1) which are connected with the positive voltage output end of the power supply, the second ends of the three normally closed contacts (1) which are connected with the first ends of the three first normally open contacts (2), and the second ends of the three first normally open contacts (2) which are connected with the negative voltage output end of the power supply.
5. The three-phase inconsistent protection circuit of claim 4, wherein the first end of the third normally open contact (11) is connected to an electrical connection line between the second ends of the three connected normally closed contacts (1) and the first ends of the three connected first normally open contacts (2).
6. The three-phase inconsistent protection circuit of claim 1, further comprising: the reset switch (8) comprises a first end and a second end, the first end of the reset switch (8) is connected with the positive voltage output end of the power supply, the second end of the reset switch (8) is connected with the first end of the second normally open contact (6), and 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 switched off, the second normally open contact (6) is switched on, and the three-phase inconsistent protection circuit is reset.
7. The three-phase inconsistent protection circuit of claim 1, further comprising: an in-situ brake separating relay and an in-situ brake separating switch (9), wherein the in-situ brake separating relay comprises a third coil (10) and a fifth normally-open contact (12), the in-situ brake separating switch (9) comprises a first end and a second end, and the third coil (10) comprises a current inflow end and a current outflow end; a first end of the in-situ brake-separating switch (9) is connected with a positive voltage output end of the power supply, a second end of the in-situ brake-separating switch is connected with a current inflow end of the third coil (10), a current outflow end of the third coil (10) is connected with a negative voltage output end of the power supply, a first end of the fifth normally-open contact (12) is connected with the positive voltage output end of the power supply, and a second end of the fifth normally-open contact (12) is connected with a first end of the fourth normally-open contact (14); when the local opening switch (9) is switched on, the power supply supplies power to the third coil (10), the third coil (10) obtains the power supply to enable the fifth normally-open contact (12) to be switched on, and the power supply supplies power to the tripping coil (15) through the switched-on fifth normally-open contact (12) and the switched-on fourth normally-open contact (14) to enable the column type circuit breaker to be opened.
8. The three-phase inconsistent protection circuit of claim 1, further comprising a monitoring node (18), wherein the monitoring node (18) is disposed on an electrical connection line between the second end of the fourth normally open contact (14) and the current inflow end of the trip coil (15).
9. The three-phase inconsistent protection circuit of claim 1, further comprising a test node (19), wherein the test node (19) is disposed on an electrical connection line between the second end of the third normally open contact (11) and the first end of the fourth normally open contact (14).
10. The three-phase inconsistent protection circuit of any of claims 1-9, wherein the exit relay further includes an indicator light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121722377.XU CN216134265U (en) | 2021-07-27 | 2021-07-27 | Three-phase inconsistent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121722377.XU CN216134265U (en) | 2021-07-27 | 2021-07-27 | Three-phase inconsistent protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN216134265U true CN216134265U (en) | 2022-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121722377.XU Active CN216134265U (en) | 2021-07-27 | 2021-07-27 | Three-phase inconsistent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216134265U (en) |
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2021
- 2021-07-27 CN CN202121722377.XU patent/CN216134265U/en active Active
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Address after: 310018 No. 128, 18th Street (East), Hangzhou Economic and Technological Development Zone, Zhejiang Province Patentee after: Siemens Energy High Voltage Switch (Hangzhou) Co.,Ltd. Address before: 310018 No. 128, 18th Street (East), Hangzhou Economic and Technological Development Zone, Zhejiang Province Patentee before: Siemens (Hangzhou) high voltage switch Co.,Ltd. |
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