Monitoring circuit and system for different operation states of high-voltage circuit breaker

By designing monitoring circuits in different operating conditions of high-voltage circuit breakers, including monitoring, switching units and anti-hopping units, the problem that the circuit breaker cannot monitor the closing and tripping circuits is solved, and efficient reclosing operations and power supply reliability are achieved.

CN119619819AInactive Publication Date: 2025-03-14EDUCATION TRAINING & EVALUATION CENT OF YUNNAN POWER GRID CO LTD
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Patent Information

Application Number
CN202411757647.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-03
Publication Date
2025-03-14
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing circuit breaker control circuit cannot effectively monitor the closing circuit and closing coil, as well as the tripping circuit and the tripping coil when the circuit breaker is running in the closing and tripping positions, resulting in a low success rate of reclosing operation, a reduced power supply reliability, and may cause the circuit breaker to fail to operate and expand the power outage range.

Method used

A monitoring circuit for high-voltage circuit breaker is designed in different operating conditions, including a monitoring unit, a switching unit and an anti-hopping unit. Through the closing monitoring and tripping monitoring module, the operating status of the circuit breaker is monitored in real time, and through the switching unit and an anti-hopping unit, the circuit breaker is ensured to correctly switch the working state under different circumstances and prevent multiple trips.

Benefits of technology

Real-time monitoring when the circuit breaker is operated in the closing and tripping positions is realized, the success rate of the reclosing operation is improved, the power supply reliability is enhanced, and the risk of the circuit breaker being refused due to faults and expanding the power outage range is avoided.

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Abstract

The invention discloses a monitoring circuit for different operation states of a high-voltage circuit breaker, and the monitoring circuit comprises a monitoring unit which is used for monitoring the states of a tripping loop and a closing loop and comprises closing monitoring and tripping monitoring, and also comprises a switching unit which is connected in series with the monitoring unit and is used for switching the control modes of the circuit breaker and comprises closing switching and tripping switching; the anti-tripping unit is connected in series with the switching unit and is used for ensuring that the circuit breaker only acts once, including anti-tripping induction; according to the invention, the closing loop, the closing coil and the circuit breaker can be monitored when the circuit breaker operates at the closing position, and the tripping loop and the tripping coil can be monitored when the circuit breaker operates at the tripping position, so that the success rate of reclosing action is improved, the power supply reliability is greatly improved, and the circuit breaker is prevented from refusing to operate when the circuit breaker fails to be closed, thereby expanding the power failure range.
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Description

Technical Field

[0001] The invention relates to the technical field of electric power automation, in particular to a monitoring circuit and system for a high-voltage circuit breaker in different operating states. Background Art

[0002] At present, the circuit breaker control circuit can only perform two monitoring functions: when the circuit breaker is operating in the closed position, the trip circuit and the trip coil are monitored by the closing position relay connected in the trip circuit; and when the circuit breaker is in the tripped position, the closing circuit and the closing coil are monitored by the trip position relay connected in the closing circuit.

[0003] When the circuit breaker is in the closed position, the closing circuit and closing coil cannot be monitored. When the secondary circuit or a single component in the reclosing circuit fails, the circuit breaker cannot reliably reclose and must be processed afterwards, which affects the success rate of reclosing and greatly reduces the reliability of power supply. In addition, when the circuit breaker is in the tripped position, the tripping circuit and tripping coil cannot be monitored. If the circuit breaker is closed under fault conditions, it may cause the circuit breaker to fail to operate, thereby aggravating the scope of power outage.

[0004] At present, there are monitoring blind spots in the design of circuit breaker control circuits. There are many components in series in the control circuits under the above two operating states, which exposes the failure of a single component and will bring serious hidden dangers to the safe and stable operation of the power grid. Therefore, this patent proposes a monitoring circuit and system for high-voltage circuit breakers in different operating states, which can monitor the circuit and system of the closing circuit when the high-voltage circuit breaker is operating in the closing position, and can also monitor the circuit and system of the tripping circuit when the high-voltage circuit breaker is operating in the tripping position. Summary of the invention

[0005] In view of the above problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is that the closing circuit and the closing coil cannot be monitored when the circuit breaker is operating in the closing position, and the tripping circuit and the tripping coil cannot be monitored when the circuit breaker is operating in the tripping position.

[0007] In order to solve the above technical problems, the first object of the present invention is to provide a monitoring circuit for a high voltage circuit breaker in different operating states.

[0008] As a preferred solution of the high-voltage circuit breaker circuit monitoring circuit of the present invention, wherein: the monitoring unit is used to monitor the status of the tripping circuit and the closing circuit, including closing monitoring and tripping monitoring;

[0009] A switching unit, connected in series with the monitoring unit, for switching the control mode of the circuit breaker, including closing switching and tripping switching; and

[0010] The anti-trip unit is connected in series with the switching unit to ensure that the circuit breaker is actuated only once, including anti-trip sensing;

[0011] The closing switch is arranged between the closing monitoring and the anti-tripping sensing, and the tripping switch is arranged between the tripping monitoring and the anti-tripping sensing.

[0012] As a preferred solution of the high-voltage circuit breaker circuit monitoring circuit of the present invention, wherein: the closing monitoring includes a local closing button, one end of the local closing button is connected to the positive power supply end, and the other end is connected to the closing switch;

[0013] It also includes a voltage-type coincidence position relay and a first current-limiting resistor, wherein one end of the voltage-type coincidence position relay is connected to the positive power supply end, and the other end is connected to the first current-limiting resistor, and the other end of the first current-limiting resistor is connected to the closing switch;

[0014] It also includes a voltage-type trip position relay and a second current-limiting resistor, one end of the voltage-type trip position relay is connected to the positive power supply end, and the other end is connected to the second current-limiting resistor, and the other end of the second current-limiting resistor is connected to the closing switch;

[0015] It also includes a remote closing contact, one end of which is connected to the positive power supply end, and the other end is connected to the closing switch.

[0016] As a preferred solution of the high-voltage circuit breaker circuit monitoring circuit of the present invention, wherein: the trip monitoring includes a local trip button, one end of the local trip button is connected to the positive power supply end, and the other end is connected to the trip switch;

[0017] It also includes a voltage-type tripping position relay and a third current-limiting resistor, wherein one end of the voltage-type tripping position relay is connected to the positive power supply end, and the other end is connected to the third current-limiting resistor, and the other end of the third current-limiting resistor is connected to the trip switch;

[0018] It also includes a voltage-type closing position relay and a fourth current-limiting resistor, wherein one end of the voltage-type closing position relay is connected to the positive power supply end, and the other end is connected to the fourth current-limiting resistor, and the other end of the fourth current-limiting resistor is connected to the trip switch;

[0019] It also includes a remote tripping contact, one end of which is connected to the positive power supply end, and the other end of which is connected to the tripping switch.

[0020] As a preferred solution of the high-voltage circuit breaker circuit monitoring circuit of the present invention, wherein: the anti-tripping induction includes a first normally closed contact and a closing coil, and the first normally closed contact and the closing coil are connected to the closing switch and the negative power supply terminal;

[0021] It also includes a first normally open contact, a fourth normally open auxiliary contact and an anti-jump induction coil, wherein the first normally open contact is connected to the closing switch and the positive power supply end of the anti-jump induction coil, and the fourth normally open auxiliary contact is connected to the closing switch and the anti-jump induction coil; the other end of the anti-jump induction coil is connected to the negative power supply end;

[0022] It also includes a tripping coil, one end of which is connected to the tripping switch, and the other end is connected to the negative power supply end.

[0023] As a preferred solution of the high-voltage circuit breaker circuit monitoring circuit of the present invention, wherein: the trip switch includes a second normally open auxiliary contact and a second local contact, the second normally open auxiliary contact is connected to the local trip button and the second local contact, and the second local contact is connected to the trip coil;

[0024] It also includes a third normally closed auxiliary contact and a second remote contact, wherein the third normally closed auxiliary contact is connected to the third current limiting resistor and the second remote contact, and the second remote contact is connected to the trip coil;

[0025] It also includes a third normally open auxiliary contact, one end of which is connected to the fourth current limiting resistor and the remote tripping contact, and the other end of which is connected to the second remote contact.

[0026] As a preferred solution of the high-voltage circuit breaker circuit monitoring circuit of the present invention, wherein: the closing switch includes a first normally closed auxiliary contact and a first local contact, the first normally closed auxiliary contact is connected to the local closing button and the first local contact, and the first local contact is connected to the first normally closed contact;

[0027] It also includes a first normally open auxiliary contact and a first remote contact, wherein the first normally open auxiliary contact is connected to the first current limiting resistor and the first remote contact, and the first remote contact is connected to the second normally closed contact;

[0028] It also includes a second normally closed auxiliary contact, one end of which is connected to the second current limiting resistor and the remote closing contact, and the other end is connected to the first remote contact.

[0029] As a preferred solution of the high-voltage circuit breaker circuit monitoring circuit of the present invention, wherein: the closing switch includes a first normally closed auxiliary contact and a first local contact, the first normally closed auxiliary contact is connected to the local closing button and the first local contact, and the first local contact is connected to the first normally closed contact;

[0030] It also includes a first normally open auxiliary contact and a first remote contact, wherein the first normally open auxiliary contact is connected to the first current limiting resistor and the first remote contact positive power supply terminal, and the first remote contact negative power supply terminal is connected to the first normally closed contact.

[0031] As a preferred solution of the high-voltage circuit breaker circuit monitoring circuit of the present invention, wherein: the closing switch further includes a second normally closed contact and a second normally closed auxiliary contact, the second normally closed contact is connected to the second current limiting resistor and the second normally closed auxiliary contact, and the second normally closed auxiliary contact is connected to the first remote contact;

[0032] It also includes a third local contact, one end of which is connected to the local closing button, and the other end of which is connected to the first normally open contact and the fourth normally open auxiliary contact.

[0033] As a preferred solution of the high-voltage circuit breaker circuit monitoring circuit of the present invention, wherein: the closing switch also includes a third remote contact, one end of the third remote contact is connected to the remote closing contact, and the other end is connected to the first normally open contact and the fourth normally open auxiliary contact;

[0034] It also includes a fourth normally closed auxiliary contact, one end of the second normally closed auxiliary contact is connected to the remote closing contact, and the other end is connected to the first remote contact.

[0035] Another object of the present invention is to provide a high voltage circuit breaker circuit monitoring system.

[0036] As a preferred solution of the high-voltage circuit breaker circuit monitoring system of the present invention, the high-voltage circuit breaker circuit monitoring system includes a high-voltage circuit breaker circuit monitoring circuit.

[0037] The beneficial effects of the present invention are as follows: the present invention can monitor the closing circuit, the closing coil and the circuit breaker when the circuit breaker is operating in the closing position, and can monitor the tripping circuit and the tripping coil when the circuit breaker is operating in the tripping position, thereby improving the success rate of the reclosing action, greatly improving the power supply reliability, and avoiding the circuit breaker refusing to operate when the circuit breaker is closed to a fault, thereby expanding the scope of the power outage. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 It is the circuit diagram for monitoring the status of the closing circuit and the opening circuit when the operation box is used remotely for anti-tripping and the mechanism box is used locally for anti-tripping.

[0040] Figure 2 This is the circuit diagram for monitoring the status of the closing circuit and the opening circuit when the mechanism box anti-tripping is used both remotely and locally.

[0041] Figure 3 This is the detection diagram of the disconnection signal of the reclosing circuit.

[0042] Figure 4 This is the detection diagram of the trip circuit break signal. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0046] Example 1

[0047] Reference Figures 1 to 4 , which is the first embodiment of the present invention, provides a monitoring circuit for a high-voltage circuit breaker in different operating states, including a monitoring unit 100, a switching unit 200 and an anti-trip unit 300.

[0048] Specifically, the monitoring unit 100 is used to monitor the status of the tripping circuit and the closing circuit, including a closing monitor 101, which is used to monitor the closing circuit of the circuit breaker, and also includes a tripping monitor 102, which is used to monitor the tripping circuit of the circuit breaker, including local buttons and contacts, the local buttons include a local closing button SB1 and a local tripping button SB2, the contacts include a first local contact SBT1 and a first remote contact SBT2, the buttons and contacts are used for local control and monitoring of closing or tripping operations.

[0049] There are also relays, including voltage-type coincidence position relay CHWJ and voltage-type trip position relay TWJ, and also voltage-type trip position relay TTWJ and voltage-type closing position relay HWJ, which are used to confirm the closing or tripping state of the circuit breaker by voltage signals.

[0050] There are also current limiting resistors, including a first current limiting resistor RCHWJ, a second current limiting resistor RTWJ, a third current limiting resistor RTTWJ and a fourth current limiting resistor RHWJ, which are used to limit the current to prevent excessive current from damaging the circuit.

[0051] Specifically, the switching unit 200 is connected in series with the monitoring unit 100 to switch the control mode of the circuit breaker, including a closing switch 201 connected to the closing monitor 101, and a tripping switch 202 connected to the tripping monitor 102, to ensure that the circuit breaker can correctly switch its working state according to the instructions of the monitoring system under different circumstances.

[0052] Specifically, the anti-tripping unit 300 and the switching unit 200 are connected in series to ensure that the circuit breaker is actuated only once to prevent multiple tripping, including an anti-tripping induction 301, in which a first normally open contact FTJ2 and a first normally closed contact FTJ1 are connected in series with the anti-tripping induction coil FTJ to ensure the normal operation of the anti-tripping logic and avoid multiple closings of the circuit breaker due to the continued existence of the fault signal, thereby affecting the stability and safety of the circuit.

[0053] Specifically, the closing switch 201 is arranged between the closing monitoring 101 and the anti-tripping sensor 301, and the tripping switch 202 is arranged between the tripping monitoring 102 and the anti-tripping sensor 301. The closing switch 201 is used to close the power supply when necessary; the tripping switch 202 is used to disconnect the power supply when a fault or other abnormal situation occurs. The anti-tripping sensor 301 is used to detect abnormal situations in the circuit, such as loop abnormalities, and send signals to prevent incorrect closing, thereby jointly ensuring the safe operation of the power system.

[0054] When in use, the monitoring unit 100 is used to monitor the status of the tripping circuit and the closing circuit, and the switching unit 200 is used to switch the control mode of the circuit breaker to ensure that the circuit breaker can correctly switch its working state according to the instructions of the monitoring system under different circumstances; the anti-tripping unit 300 is used to ensure that the circuit breaker only operates once to prevent multiple closings, so as to avoid multiple closings of the circuit breaker due to the continued existence of the fault signal, which affects the stability and safety of the circuit.

[0055] Example 2

[0056] Reference Figure 1 , Figure 3 and Figure 4 , which is the second embodiment of the present invention, and is based on the previous embodiment. This embodiment provides a monitoring circuit for high-voltage circuit breakers in different operating states, which is used to monitor the closing circuit and opening circuit states when the operation box is used remotely for anti-tripping and the mechanism box is used locally for anti-tripping.

[0057] The closing monitor 101 includes a local closing button SB1, one end of which is connected to the positive power supply end, and the other end is connected to the closing switch 201; it also includes a voltage-type coincidence position relay CHWJ and a first current-limiting resistor RCHWJ, one end of the voltage-type coincidence position relay CHWJ is connected to the positive power supply end, and the other end is connected to the first current-limiting resistor RCHWJ, and the other end of the first current-limiting resistor RCHWJ is connected to the closing switch 201; it also includes a voltage-type tripping position relay TWJ and a second current-limiting resistor RTWJ, one end of the voltage-type tripping position relay TWJ is connected to the positive power supply end, and the other end is connected to the second current-limiting resistor RTWJ, and the other end of the second current-limiting resistor RTWJ is connected to the closing switch 201; it also includes a remote closing contact YH, one end of the remote closing contact YH is connected to the positive power supply end, and the other end is connected to the closing switch 201.

[0058] The tripping monitoring 102 includes a local tripping button SB2, one end of which is connected to the positive power supply terminal, and the other end is connected to the tripping switch 202; it also includes a voltage-type tripping position relay TTWJ and a third current-limiting resistor RTTWJ, one end of the voltage-type tripping position relay TTWJ is connected to the positive power supply terminal, and the other end is connected to the third current-limiting resistor RTTWJ, and the other end of the third current-limiting resistor RTTWJ is connected to the tripping switch 202; it also includes a voltage-type closing position relay HWJ and a fourth current-limiting resistor RHWJ, one end of the voltage-type closing position relay HWJ is connected to the positive power supply terminal, and the other end is connected to the fourth current-limiting resistor RHWJ, and the other end of the fourth current-limiting resistor RHWJ is connected to the tripping switch 202; it also includes a remote tripping contact YT, one end of the remote tripping contact YT is connected to the positive power supply terminal, and the other end is connected to the tripping switch 202.

[0059] The anti-tripping unit 300 and the switching unit 200 are connected in series to ensure that the circuit breaker only operates once, including an anti-tripping induction 301; the anti-tripping induction 301 includes a first normally closed contact FTJ1 and a closing coil HQ, the first normally closed contact FTJ1 is connected to the closing switch 201 and the negative power supply terminal; it also includes a first normally open contact FTJ2, a fourth normally open auxiliary contact S8 and an anti-tripping induction coil FTJ, the first normally open contact FTJ2 is connected to the closing switch 201 and the positive power supply terminal of the anti-tripping induction coil FTJ, the fourth normally open auxiliary contact S8 is connected to the closing switch 201 and the anti-tripping induction coil FTJ; the other end of the anti-tripping induction coil FTJ is connected to the negative power supply terminal; it also includes a tripping coil TQ, one end of the tripping coil TQ is connected to the tripping switch 202, and the other end is connected to the negative power supply terminal.

[0060] The switching unit 200 is connected in series with the monitoring unit 100 and is used to switch the control mode of the circuit breaker, including a closing switch 201 and a tripping switch 202; the tripping switch 202 includes a second normally open auxiliary contact S4 and a second local contact SBT3, the second normally open auxiliary contact S4 is connected to the local trip button SB2 and the second local contact SBT3, and the second local contact SBT3 is connected to the tripping coil TQ; it also includes a third normally closed auxiliary contact S5 and a second remote contact SBT4, the third normally closed auxiliary contact S5 is connected to the third current limiting resistor RTTWJ and the second remote contact SBT4, and the second remote contact SBT4 is connected to the tripping coil TQ; it also includes a third normally open auxiliary contact S6, one end of the third normally open auxiliary contact S6 is connected to the fourth current limiting resistor RHWJ and the remote tripping contact YT, and the other end is connected to the second remote contact SBT4.

[0061] The closing switch 201 includes a first normally closed auxiliary contact S1 and a first local contact SBT1, the first normally closed auxiliary contact S1 is connected to the local closing button SB1 and the first local contact SBT1, the first local contact SBT1 is connected to the first normally closed contact FTJ1; it also includes a first normally open auxiliary contact S2 and a first remote contact SBT2, the first normally open auxiliary contact S2 is connected to the first current limiting resistor RCHWJ and the first remote contact SBT2, the first remote contact SBT2 is connected to the first normally open contact FTJ2 and the fourth normally open auxiliary contact S8; it also includes a second normally closed auxiliary contact S3, one end of the second normally closed auxiliary contact S3 is connected to the second current limiting resistor RTWJ and the remote closing contact YH, and the other end is connected to the first remote contact SBT2.

[0062] The voltage-type coincidence position relay CHWJ includes a coincidence normally closed contact CHWJ1, the voltage-type tripping position relay TTWJ includes a tripping normally closed contact TTWJ1, the voltage-type tripping position relay TWJ includes a tripping normally open contact TWJ1, the voltage-type closing position relay HWJ includes a closing normally open contact HWJ1, the first normally closed contact CHWJ1 is connected to the first normally open contact HWJ1, and the first normally closed contact TTWJ1 is connected to the first normally open contact TWJ1.

[0063] When the high-voltage circuit breaker is in the closed position, the first normally open auxiliary contact S2 is closed; when the remote local switch is in the remote position, the first remote contact SBT2 is closed, the voltage sensing coil CHWJ of the coincidence position relay senses the voltage and operates, and the first normally closed contact CHWJ1 is disconnected;

[0064] When the voltage sensing coil CHWJ of the reclosing position relay loses power, the first normally closed contact CHWJ1 closes, and the "reclosing circuit is broken" sends out an alarm signal.

[0065] When the high-voltage circuit breaker is in the open position, the first normally closed auxiliary contact S1 is closed. When the remote / local switch SBT is switched to the local position, the first local contact SBT1 is closed. When closing the circuit locally, the SB1 button is closed, and the closing coil HQ senses the voltage and operates to close the high-voltage circuit breaker.

[0066] At this time, if the local closing button SB1 is closed and does not return, the fourth normally open auxiliary contact S8 is closed, the anti-tripping relay FTJ coil is inductively activated by the voltage, the first normally closed contact FTJ1 is disconnected, and the first normally open contact FTJ2 is closed, and the excitation of the anti-tripping relay FTJ coil is self-maintained, ensuring that when the local closing is performed and the closing contacts are stuck, causing the closing command to be issued continuously, the high-voltage circuit breaker is only closed once.

[0067] When the high-voltage circuit breaker is in the open position, the second normally closed auxiliary contact S3 is closed. When the remote / local switch SBT is switched to the remote position, the first remote contact SBT2 is closed. When the remote is closed, the positive power supply passes through the remote closing contact, the second normally closed auxiliary contact S3, and the first remote contact SBT2 to the closing coil HQ. The closing coil senses the voltage and operates to close the high-voltage circuit breaker.

[0068] Example 3

[0069] Reference Figure 2 , Figure 3 and Figure 4 , which is the third embodiment of the present invention, is based on the previous embodiment. The difference from the previous embodiment is that the structure and connection of the closing switch 201 are used to monitor the closing circuit and opening circuit status when the mechanism box is used for anti-tripping both remotely and locally.

[0070] Specifically, the closing switch 201 includes a first normally closed auxiliary contact S1 and a first local contact SBT1, the first normally closed auxiliary contact S1 is connected to the local closing button SB1 and the first local contact SBT1, the first local contact SBT1 is connected to the first normally closed contact FTJ1; it also includes a first normally open auxiliary contact S2 and a first remote contact SBT2, the first normally open auxiliary contact S2 is connected to the first current limiting resistor RCHWJ and the first remote contact SBT2, the first remote contact SBT2 is connected to the first normally open contact FTJ2 and the fourth normally open auxiliary contact S8; it also includes a second normally closed contact FTJ3 and a second normally closed auxiliary contact S3, the second normally closed contact FTJ3 is connected to the second current limiting resistor RCHWJ and the first remote contact SBT2. The current resistor RTWJ and the second normally closed auxiliary contact S3 are connected, and the second normally closed auxiliary contact S3 is connected to the first remote contact SBT2; it also includes a third local contact SBT5, one end of the third local contact SBT5 is connected to the local closing button SB1, and the other end is connected to the first normally open contact FTJ2 and the fourth normally open auxiliary contact S8; it also includes a third remote contact SBT6, one end of the third remote contact SBT6 is connected to the remote closing contact YH, and the other end is connected to the first normally open contact FTJ2 and the fourth normally open auxiliary contact S8; it also includes a fourth normally closed auxiliary contact S7, one end of the fourth normally closed auxiliary contact S7 is connected to the remote closing contact YH, and the other end is connected to the first remote contact SBT2.

[0071] When the high-voltage circuit breaker is remotely / locally operated with an operating box for anti-tripping, when the high-voltage circuit breaker is operating in the closed position, the first normally open auxiliary contact S2 is closed, and when the remote local switch is operating in the remote position, the first remote contact SBT2 is closed, the voltage sensing coil CHWJ of the coincidence position relay senses the voltage and operates, and the first normally closed contact CHWJ1 is disconnected; when the voltage sensing coil CHWJ of the coincidence position relay loses power, the first normally closed contact CHWJ1 is closed, and the "reclosing circuit is broken" sends a signal to the outside.

[0072] When the high-voltage circuit breaker is in the open position, the first normally closed auxiliary contact S1 is closed. When the remote / local switch SBT is switched to the local position, the first local contact SBT1 and the third local contact SBT5 are closed. When closing the circuit locally, the SB button is closed, and the closing coil HQ senses the voltage and operates to close the high-voltage circuit breaker. At this time, if the local closing button SB is closed and does not return, the fourth normally open auxiliary contact S8 is closed, the anti-tripping relay FTJ coil is sensed by the voltage and operates, the first normally closed contact FTJ1 is disconnected, and the first normally open contact FTJ2 is closed, and the excitation of the anti-tripping relay FTJ coil is self-maintained, ensuring that when closing the circuit locally and the closing contacts are stuck, causing the closing command to be issued continuously, the high-voltage circuit breaker is only closed once.

[0073] When the high-voltage circuit breaker is in the open position, the second normally closed auxiliary contact S3 is closed. When the remote / local switching switch SBT is switched to the remote position, the first remote contact SBT2 and the third remote contact SBT6 are closed. When the remote closing is performed, YH is closed. At this time, if the remote closing contact YH is stuck and does not return, the fourth normally open auxiliary contact S8 is closed, the anti-tripping relay FTJ coil is inductively activated by the voltage, the first normally closed contact FTJ1 is disconnected, and the first normally open contact FTJ2 is closed. The excitation of the anti-tripping relay FTJ coil is self-maintained, ensuring that when the local closing is performed and the closing contact is stuck, resulting in the closing command being issued continuously, the high-voltage circuit breaker is only closed once.

[0074] When the high-voltage circuit breaker is in the open position, the third normally closed auxiliary contact S5 is closed; when the remote local transfer switch is operating in the remote position, the second remote contact SBT4 is closed, the voltage sensing coil TTWJ of the trip position relay senses the voltage and operates, and the first normally closed contact TTWJ1 is disconnected;

[0075] When the voltage sensing coil TTWJ of the tripping position relay loses power, the first normally closed contact TTWJ1 closes, and the "tripping circuit is broken" alarm signal is sent out.

[0076] When the high-voltage circuit breaker is in the closed position, the third normally open auxiliary contact S6 is closed. When the remote / local switch SBT is switched to the remote position, the second remote contact SBT4 is closed. When the remote switch is closed, the YT contact is closed, and the trip coil TQ senses the voltage and operates to trip the high-voltage circuit breaker.

[0077] Example 4

[0078] Reference Figure 1 to Figure 4 , which is the fourth embodiment of the present invention, and is based on the first three embodiments. This embodiment provides a high-voltage circuit breaker circuit monitoring system, including a high-voltage circuit breaker circuit monitoring circuit.

[0079] The system includes a monitoring unit 100 , a switching unit 200 and an anti-jump unit 300 .

[0080] Specifically, the monitoring unit 100 is used to monitor the status of the tripping circuit and the closing circuit, including a closing monitoring 101, which is used to monitor whether the circuit breaker is closed, and also includes a tripping monitoring 102, which is used to monitor whether the circuit breaker is tripped, including local buttons and contacts, the local buttons include a local closing button SB1 and a local tripping button SB2, the contacts include a first local contact SBT1 and a first remote contact SBT2, the buttons and contacts are used for local control and monitoring of closing or tripping operations.

[0081] There are also relays, including voltage-type coincidence position relay CHWJ and voltage-type trip position relay TWJ, and also voltage-type trip position relay TTWJ and voltage-type closing position relay HWJ, which are used to confirm the closing or tripping state of the circuit breaker by voltage signals.

[0082] There are also current limiting resistors, including a first current limiting resistor RCHWJ, a second current limiting resistor RTWJ, a third current limiting resistor RTTWJ and a fourth current limiting resistor RHWJ, which are used to limit the current to prevent excessive current from damaging the circuit.

[0083] Specifically, the switching unit 200 is connected in series with the monitoring unit 100 to switch the control mode of the circuit breaker, including a closing switch 201 connected to the closing monitor 101, and a tripping switch 202 connected to the tripping monitor 102, to ensure that the circuit breaker can correctly switch its working state according to the instructions of the monitoring system under different circumstances.

[0084] Specifically, the anti-tripping unit 300 and the switching unit 200 are connected in series to ensure that the circuit breaker is actuated only once to prevent multiple tripping, including an anti-tripping induction 301, in which a first normally open contact FTJ2 and a first normally closed contact FTJ1 are connected in series with the anti-tripping induction coil FTJ to ensure the normal operation of the anti-tripping logic and avoid multiple tripping of the circuit breaker due to the continued existence of the fault signal, thereby affecting the stability and safety of the circuit.

[0085] Specifically, the closing switch 201 is arranged between the closing monitoring 101 and the anti-tripping induction 301, and the tripping switch 202 is arranged between the tripping monitoring 102 and the anti-tripping induction 301. The closing switch 201 is used to close the power supply when necessary; the tripping switch 202 is used to disconnect the power supply when a fault or other abnormal situation occurs. The anti-tripping induction 301 is used to detect abnormal situations in the circuit, such as short circuit or overload, and send a signal to prevent erroneous closing or tripping actions, thereby jointly ensuring the safe operation of the power system.

[0086] When in use, the monitoring unit 100 is used to monitor the status of the tripping circuit and the closing circuit, and the switching unit 200 is used to switch the control mode of the circuit breaker to ensure that the circuit breaker can correctly switch its working state according to the instructions of the monitoring system under different circumstances; the anti-tripping unit 300 is used to ensure that the circuit breaker only operates once to prevent multiple tripping, so as to avoid multiple tripping of the circuit breaker due to the continued existence of the fault signal, which affects the stability and safety of the circuit.

[0087] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A monitoring circuit for a high voltage circuit breaker in different operating states, characterized in that: include, A monitoring unit (100) is used to monitor the status of a tripping circuit and a closing circuit, including a closing monitor (101) and a tripping monitor (102); A switching unit (200) is connected in series with the monitoring unit (100) and is used to switch the control mode of the circuit breaker, including closing switching (201) and tripping switching (202); and The anti-tripping unit (300) is connected in series with the switching unit (200) to ensure that the circuit breaker is actuated only once, and includes an anti-tripping induction (301); The closing switch (201) is arranged between the closing monitoring (101) and the anti-tripping induction (301), and the tripping switch (202) is arranged between the tripping monitoring (102) and the anti-tripping induction (301).

2. The high voltage circuit breaker circuit monitoring circuit according to claim 1, characterized in that: Also includes, The closing monitor (101) comprises a local closing button (SB1), one end of the local closing button (SB1) is connected to the positive power supply end, and the other end is connected to the closing switch (201); It also includes a voltage-type coincidence position relay (CHWJ) and a first current-limiting resistor (RCHWJ), wherein one end of the voltage-type coincidence position relay (CHWJ) is connected to the positive power supply end, and the other end is connected to the first current-limiting resistor (RCHWJ), and the other end of the first current-limiting resistor (RCHWJ) is connected to the closing switch (201); It also includes a voltage-type trip position relay (TWJ) and a second current-limiting resistor (RTWJ), wherein one end of the voltage-type trip position relay (TWJ) is connected to the positive power supply end, and the other end is connected to the second current-limiting resistor (RTWJ), and the other end of the second current-limiting resistor (RTWJ) is connected to the closing switch (201); It also includes a remote closing contact (YH), ​​one end of which is connected to the positive power supply end, and the other end of which is connected to the closing switch (201).

3. The high voltage circuit breaker circuit monitoring circuit according to claim 2, characterized in that: The tripping monitoring (102) comprises a local tripping button (SB2), one end of the local tripping button (SB2) is connected to the positive power supply end, and the other end is connected to the tripping switch (202); It also includes a voltage-type trip position relay (TTWJ) and a third current-limiting resistor (RTTWJ), wherein one end of the voltage-type trip position relay (TTWJ) is connected to the positive power supply end, and the other end is connected to the third current-limiting resistor (RTTWJ), and the other end of the third current-limiting resistor (RTTWJ) is connected to the trip switch (202); It also includes a voltage-type closing position relay (HWJ) and a fourth current-limiting resistor (RHWJ), wherein one end of the voltage-type closing position relay (HWJ) is connected to the positive power supply end, and the other end is connected to the fourth current-limiting resistor (RHWJ), and the other end of the fourth current-limiting resistor (RHWJ) is connected to the trip switch (202); It also includes a remote tripping contact (YT), one end of which is connected to the positive power supply end, and the other end of which is connected to the tripping switch (202).

4. The high voltage circuit breaker circuit monitoring circuit according to claim 3, characterized in that: The anti-jump sensor (301) comprises a first normally closed contact (FTJ1) and a closing coil (HQ), wherein the first normally closed contact (FTJ1) and the closing coil (HQ) are connected to the closing switch (201) and a negative power supply terminal; It also includes a first normally open contact (FTJ2), a fourth normally open auxiliary contact (S8) and an anti-jump induction coil (FTJ), wherein the first normally open contact (FTJ2) is connected to the closing switch (201) and the positive power supply end of the anti-jump induction coil (FTJ), and the fourth normally open auxiliary contact (S8) is connected to the closing switch (201) and the anti-jump induction coil (FTJ); the other end of the anti-jump induction coil (FTJ) is connected to the negative power supply end; It also includes a trip coil (TQ), one end of which is connected to the trip switch (202), and the other end of which is connected to the negative power supply end.

5. The high voltage circuit breaker circuit monitoring circuit according to claim 4, characterized in that: The trip switch (202) comprises a second normally open auxiliary contact (S4) and a second local contact (SBT3), wherein the second normally open auxiliary contact (S4) is connected to the local trip button (SB2) and the second local contact (SBT3), and the second local contact (SBT3) is connected to the trip coil (TQ); It also includes a third normally closed auxiliary contact (S5) and a second remote contact (SBT4), wherein the third normally closed auxiliary contact (S5) is connected to the third current limiting resistor (RTTWJ) and the second remote contact (SBT4), and the second remote contact (SBT4) is connected to the trip coil (TQ); It also includes a third normally open auxiliary contact (S6), one end of which is connected to the fourth current limiting resistor (RHWJ) and the remote tripping contact (YT), and the other end is connected to the second remote contact (SBT4).

6. The high voltage circuit breaker circuit monitoring circuit according to claim 5, characterized in that: The closing switch (201) comprises a first normally closed auxiliary contact (S1) and a first local contact (SBT1), wherein the first normally closed auxiliary contact (S1) is connected to the local closing button (SB1) and the first local contact (SBT1), and the first local contact (SBT1) is connected to the first normally closed contact (FTJ1); It also includes a first normally open auxiliary contact (S2) and a first remote contact (SBT2), wherein the first normally open auxiliary contact (S2) is connected to the first current limiting resistor (RCHWJ) and the first remote contact (SBT2), and the first remote contact (SBT2) is connected to the first normally closed contact (FTJ1); It also includes a second normally closed auxiliary contact (S3), one end of which is connected to the second current limiting resistor (RTWJ) and the remote closing contact (YH), ​​and the other end is connected to the first remote contact (SBT2).

7. The high voltage circuit breaker circuit monitoring circuit according to claim 5, characterized in that: The closing switch (201) comprises a first normally closed auxiliary contact (S1) and a first local contact (SBT1), wherein the first normally closed auxiliary contact (S1) is connected to the local closing button (SB1) and the first local contact (SBT1), and the first local contact (SBT1) is connected to the first normally closed contact (FTJ1); It also includes a first normally open auxiliary contact (S2) and a first remote contact (SBT2), wherein the first normally open auxiliary contact (S2) is connected to the first current limiting resistor (RCHWJ) and the positive power supply terminal of the first remote contact (SBT2), and the negative power supply terminal of the first remote contact (SBT2) is connected to the first normally closed contact (FTJ1).

8. The high voltage circuit breaker circuit monitoring circuit according to claim 7, characterized in that: The closing switch (201) further comprises a second normally closed contact (FTJ3) and a second normally closed auxiliary contact (S3), wherein the second normally closed contact (FTJ3) is connected to the second current limiting resistor (RTWJ) and the second normally closed auxiliary contact (S3), and the second normally closed auxiliary contact (S3) is connected to the positive power supply terminal of the first remote contact (SBT2); It also includes a third local contact (SBT5), one end of which is connected to the local closing button (SB1), and the other end of which is connected to the first normally open contact (FTJ2) and the fourth normally open auxiliary contact (S8).

9. The high voltage circuit breaker circuit monitoring circuit according to claim 8, characterized in that: The closing switch (201) further comprises a third remote contact (SBT6), one end of the third remote contact (SBT6) being connected to the remote closing contact (YH), ​​and the other end of the third remote contact (SBT6) being connected to the first normally open contact (FTJ2) and the fourth normally open auxiliary contact (S8); It also includes a fourth normally closed auxiliary contact (S7), one end of which is connected to the remote closing contact (YH) and the other end of which is connected to the first remote contact (SBT2).

10. A high voltage circuit breaker circuit monitoring system, characterized in that: It comprises a high-voltage circuit breaker circuit monitoring circuit as claimed in any one of claims 1 to 9.