CN115047327A - Circuit breaker closes trip full operating mode and keeps watch on operation return circuit - Google Patents

Circuit breaker closes trip full operating mode and keeps watch on operation return circuit Download PDF

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Publication number
CN115047327A
CN115047327A CN202210276713.5A CN202210276713A CN115047327A CN 115047327 A CN115047327 A CN 115047327A CN 202210276713 A CN202210276713 A CN 202210276713A CN 115047327 A CN115047327 A CN 115047327A
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China
Prior art keywords
trip
closing
contact
relay
monitoring
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CN202210276713.5A
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Chinese (zh)
Inventor
李珂
王辉
李巍
魏小栋
张成仁
赵冠琨
李永丽
陈晓龙
孙丽蓉
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State Grid Shaanxi Electric Power Co Ltd Xi'an Power Supply Co
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State Grid Shaanxi Electric Power Co Ltd Xi'an Power Supply Co
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Priority to CN202210276713.5A priority Critical patent/CN115047327A/en
Publication of CN115047327A publication Critical patent/CN115047327A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Keying Circuit Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention relates to a circuit breaker on/off full-working-condition monitoring operation loop, wherein an element is added in the circuit breaker operation loop to improve the loop, the model selection and parameter setting basis of the element are given, the running state of the circuit breaker on/off loop is analyzed, and the full-working-condition monitoring, the broken line branch recognition and the loop protection of the on/off loop are realized.

Description

Circuit breaker closes trip full operating mode and keeps watch on operation return circuit
Technical Field
The invention belongs to the field of power protection, relates to a relay, and particularly relates to a circuit breaker on/off full-working-condition monitoring operation loop.
Background
Circuit breakers are critical electrical devices driven by protection to isolate faulty components, playing a dual role in protection and control in electrical power systems. Incorrect operation of the circuit breaker can cause a power grid accident or enlarge the accident range, even cause the power system to be collapsed, and cause great economic loss. The reason for the incorrect operation of the circuit breaker is caused by a fault of an operation circuit for controlling the tripping/closing operation of the circuit breaker, in addition to a fault of the circuit breaker. The operation loop is a bridge between the connection protection device and the circuit breaker and mainly comprises a plurality of relays, contacts of the relays and secondary cables for connecting all elements. The adhesion of the contact and the disconnection of the circuit are the most frequent faults in the operation circuit and are one of the main reasons causing the incorrect action of the protection system.
The method for directly monitoring the normal traffic light loop of the operation loop or indirectly monitoring the normally closed contact of the position relay by connecting the signal loop in series cannot monitor the closing loop after the breaker is closed and cannot monitor the tripping loop after tripping. The direct current operation loop can only achieve the purpose of continuously monitoring the direct current operation power supply, and cannot meet the requirement of continuously monitoring the tripping/closing loop under the full working condition. In addition, no matter whether the tripping circuit or the closing circuit has the disconnection abnormality, the operation circuit disconnection monitoring circuit can send out the same alarm signal. Therefore, the traditional method cannot specifically identify the branch with the broken line. Finally, if the circuit breaker auxiliary contact QF2 or QF1 fails to break the tripping/closing circuit after completing the tripping/closing operation due to contact adhesion or refusal, the tripping/closing circuit is continuously in a conducting state after the circuit breaker completes the operation due to the self-holding relay TBJ of the circuit and the closed contact of the HBJ, and if the conducting state lasts for a long time, elements in the circuit, particularly a tripping/closing coil, will be burned out due to overheating, thereby causing the circuit to be disconnected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, improve a circuit by adding elements in an operation circuit of the circuit breaker, provide the basis for type selection and parameter setting of the elements, analyze the running state of a tripping/closing circuit of the circuit breaker and realize full-working-condition monitoring, disconnection branch identification and circuit protection of the tripping/closing circuit.
The technical problem to be solved by the invention is realized by the following technical scheme:
a circuit breaker closes/trips full operating mode and keeps watch on the operating circuit, characterized by: the operation loop comprises a closing loop and a tripping loop;
after a normally open contact HTJ1 and an automatic closing contact ZHJ of a closing time relay in the closing loop are connected in parallel with a manual closing contact SHJ, the normally open contact HTJ1 and the automatic closing contact ZHJ are sequentially connected in series with the closing time relay HTJ, an anti-tripping relay contact TTJ3, a closing time relay time-delay normally closed contact HTJ2, a cable, a breaker normally closed auxiliary contact QF1 and a closing coil HQ, a closing position relay HWJ is connected in parallel with a breaker normally closed auxiliary contact QF1, one end of a closing and disconnecting monitoring relay HDJJ is connected with a direct-current operating power supply, and the other end of the closing and disconnecting monitoring relay HDJJ is connected with the closing coil through the cable and the breaker normally closed auxiliary contact QF 1;
the trip circuit is characterized in that after a trip time relay normally-open contact TTJ1, an automatic trip contact ZTJ and a manual trip contact STJ are connected in parallel, the trip time relay normally-open contact TTJ1, the automatic trip contact ZTJ and the manual trip contact STJ are sequentially connected in series, the trip time relay TTJ, the trip time relay time delay normally-closed contact TTJ2, a cable, a breaker normally-open auxiliary contact QF2 and a trip coil TQ are connected in series, a trip position relay TWJ is connected in parallel with a breaker normally-open auxiliary contact QF2, one end of a trip wire breaking monitoring relay TDJJ is connected with a direct current operating power supply, and the other end of the trip wire breaking monitoring relay TDJJ is connected with the trip coil through the cable and the breaker normally-open auxiliary contact QF 2.
Moreover, the closing and breaking monitoring relay HDJJ, the cable, the closing position relay HWJ and the closing coil HQ are sequentially connected in series to form a breaking monitoring branch after the closing loop is closed; the switching-on and breaking monitoring relay HDJJ, the cable, the breaker normally-closed auxiliary contact QF1 and the switching-on coil HQ are sequentially connected in series to form a monitoring branch after the switching-on loop trips, and the two monitoring branches jointly form full-working-condition monitoring on the switching-on loop.
Moreover, the trip disconnection monitoring relay TDJJ, the cable, the trip position relay TWJ and the trip coil TQ are sequentially connected in series to form a disconnection monitoring branch circuit after the trip loop trips; the trip disconnection monitoring relay TDJJ, the cable, the normally open auxiliary contact QF2 of the circuit breaker and the trip coil TQ are sequentially connected in series to form a monitoring branch circuit after the trip circuit is switched on, and the two monitoring branch circuits jointly form full-working-condition monitoring on the trip circuit.
The invention has the advantages and beneficial effects that:
1. the circuit breaker on/off full-working-condition monitoring operation loop improves the existing off/on loop, gives the basis of selection of elements in the loop and parameter setting, and can realize the full-working-condition monitoring of the off/on loop, namely the off/on loop can be always monitored no matter in the off position or the off position.
2. According to the circuit breaker on/off full-working-condition monitoring operation loop, the added time relay delay contact can realize protection of the off/on loop, and element burnout caused by long-time conduction of the off/on loop due to adhesion or movement rejection of the auxiliary contact of the circuit breaker is avoided.
3. According to the circuit breaker on/off full-working-condition monitoring operation loop, the improved off/on loop can identify the broken branch, and whether the on loop or the off loop is broken can be independently monitored.
Drawings
Fig. 1 is a schematic structural diagram of a modified closing circuit in an embodiment of the present invention;
fig. 2 is a schematic diagram of an improved trip circuit structure in an embodiment of the invention.
Description of the reference numerals
An automatic closing contact ZHJ; a manual closing contact SHJ; a closing time relay HTJ; an anti-bounce relay contact TTJ 3; a normally open contact HTJ1 of a closing time relay; a closing time relay delay normally closed contact HTJ 2; closing and breaking monitoring relay HDJJ; a breaker normally closed auxiliary contact QF 1; a switch-on position relay HWJ; a closing coil HQ; an automatic trip contact ZTJ; a manual trip contact STJ; a trip time relay TTJ; trip time relay normally open contact TTJ 1; a trip time relay time delay normally closed contact TTJ 2; a trip disconnection monitoring relay TDJJ; a breaker normally open auxiliary contact QF 2; a trip position relay TWJ; the trip coil TQ.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
A circuit breaker closes/trips full operating mode and keeps watch on the operating circuit, characterized by: the operation loop comprises a closing loop and a tripping loop.
As shown in fig. 1, the improved closing circuit of the present invention has the following specific structure:
(1) after a closing time relay normally-open contact HTJ1, an automatic closing contact ZHJ and a manual closing contact SHJ in a closing loop are connected in parallel, the closing time relay HTJ, an anti-tripping relay contact TTJ3, a closing time relay time-delay normally-closed contact HTJ2, a cable, a breaker normally-closed auxiliary contact QF1 and a closing coil HQ are sequentially connected in series, a closing position relay HWJ is connected in parallel with a breaker normally-closed auxiliary contact QF1, one end of a closing and disconnecting monitoring relay HDJJ is connected with a direct-current operating power supply, and the other end of the closing and disconnecting monitoring relay HDJJ is connected with the closing coil through the cable and the breaker normally-closed auxiliary contact QF 1.
(2) The closing and breaking monitoring relay HDJJ, the cable, the closing position relay HWJ and the closing coil HQ are sequentially connected in series to form a breaking monitoring branch after the closing loop is closed; and the closing and breaking monitoring relay HDJJ, the cable, the normally closed auxiliary contact QF1 of the circuit breaker and the closing coil HQ are sequentially connected in series to form a monitoring branch circuit after the tripping of the closing loop. The two monitoring branches jointly form the full-working-condition monitoring of the closing brake loop.
(3) The normally open contact HTJ1 of the closing time relay can meet the self-holding requirement of closing action; the closing time relay time-delay normally closed contact HTJ2 can normally cut off a closing loop after the closing operation of the circuit breaker is completed, and meanwhile, the normally closed auxiliary contact QF1 of the circuit breaker can be prevented from being burnt out due to the fact that an action current flows through an element of the action loop for a long time, and the protection of the closing loop is achieved.
(4) The switch-on position relay HWJ is turned on only after the circuit breaker is closed, and its contact state can reflect whether the current circuit breaker is in the switch-on position.
As shown in fig. 2, the improved trip circuit of the present invention has the following specific structure:
(1) after a tripping time relay normally-open contact TTJ1, an automatic tripping contact ZTJ and a manual tripping contact STJ are connected in parallel in a tripping loop, the tripping time relay TTJ, the tripping time relay time delay normally-closed contact TTJ2, a cable, a breaker normally-open auxiliary contact QF2 and a tripping coil TQ are sequentially connected in series, a tripping position relay TWJ is connected in parallel with a breaker normally-open auxiliary contact QF2, one end of a tripping broken wire monitoring relay TDJJ is connected with a direct current operating power supply, and the other end of the tripping position relay TWJ is connected with the tripping coil through the cable and the breaker normally-open auxiliary contact QF 2.
(2) The trip disconnection monitoring relay TDJJ, the cable, the trip position relay TWJ and the trip coil TQ are sequentially connected in series to form a disconnection monitoring branch circuit after the trip loop trips; the trip disconnection monitoring relay TDJJ, the cable, the normally open auxiliary contact QF2 of the circuit breaker and the trip coil TQ are sequentially connected in series to form a monitoring branch circuit after the trip circuit is switched on. The two monitoring branches jointly form the full-working-condition monitoring of the tripping circuit.
(3) The trip time relay normally open contact TTJ1 can meet the self-holding requirement of trip action; the tripping time relay time-delay normally closed contact TTJ2 can normally cut off a tripping circuit after the tripping operation of the circuit breaker is completed, and meanwhile, the circuit elements can be prevented from being burnt out due to the fact that action current flows through the circuit elements for a long time when the normally open auxiliary contact QF2 refuses to move, and the protection of the tripping circuit is realized.
(4) The trip position relay TWJ is turned on only after the circuit breaker is tripped, and its contact state can reflect whether the current circuit breaker is in the trip position.
The contact capacity and setting time of the relay are considered when selecting the time relay. In order that the tripping/closing time relay delay contact can cut off tripping/closing loop current after tripping/closing operation is completed, a relay with large contact capacity is selected as much as possible. The setting time of the time relay is slightly larger than the tripping/closing time of the circuit breaker so as to ensure the reliable action of the circuit breaker.
Taking a closing loop as an example, in order to prevent the closing coil from being burnt out due to long-term conduction of the closing loop, the internal resistance of the closing and disconnecting monitoring relay HDJJ is relatively large; in addition, since the closing position relay HWJ is required to limit the current so that the time relay delay contact can cut off the closing circuit current after the closing operation is completed, the closing position relay HWJ should be large. To facilitate the model selection of the on position relay HWJ, the same relay as the on/off monitoring relay HDJJ is selected. Therefore, the requirements for the switch position relay HWJ are:
(1) in order to prevent the tripping/closing coil from being burnt due to the long-term conduction of the tripping/closing loop, the current passing through the tripping/closing coil is not more than the long-term thermal stable current. Assuming that the long-term thermal stable current of a tripping/closing coil is I s Then R is w Should satisfy
Figure BDA0003556309040000051
(2) In order that the time relay delay contact can cut off the current of the closing loop after the closing operation is finished, the passing current of the closing operation finished loop is smaller than the maximum current which can be cut off by the contact. Assuming that the maximum current that the time relay contact can cut off is I cut Then R is w Should satisfy
Figure BDA0003556309040000052
(3) In order to monitor the trip/close loop using the contact states of the close wire monitoring relay HDJJ and the close position relay HWJ, the current through the relay should be greater than its starting current. Suppose the starting current of the relay is I q Then R is w Should satisfy
Figure BDA0003556309040000053
Wherein R is c Resistance, R, representing closing coil HQ w Indicating the internal resistance, R, of the closing and breaking monitoring relay HDJJ or the closing position relay HWJ t Indicating the internal resistance of the closing time relay HTJ.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.

Claims (3)

1. A circuit breaker closes/trips full operating mode and keeps watch on the operating circuit, characterized by: the operation loop comprises a closing loop and a tripping loop;
after a normally open contact HTJ1 and an automatic closing contact ZHJ of a closing time relay in the closing loop are connected in parallel with a manual closing contact SHJ, the normally open contact HTJ1 and the automatic closing contact ZHJ are sequentially connected in series with the closing time relay HTJ, an anti-tripping relay contact TTJ3, a closing time relay time-delay normally closed contact HTJ2, a cable, a breaker normally closed auxiliary contact QF1 and a closing coil HQ, a closing position relay HWJ is connected in parallel with a breaker normally closed auxiliary contact QF1, one end of a closing and disconnecting monitoring relay HDJJ is connected with a direct-current operating power supply, and the other end of the closing and disconnecting monitoring relay HDJJ is connected with the closing coil through the cable and the breaker normally closed auxiliary contact QF 1;
the trip circuit is characterized in that after a trip time relay normally-open contact TTJ1, an automatic trip contact ZTJ and a manual trip contact STJ are connected in parallel, the trip time relay normally-open contact TTJ1, the automatic trip contact ZTJ and the manual trip contact STJ are sequentially connected in series, the trip time relay TTJ, the trip time relay time delay normally-closed contact TTJ2, a cable, a breaker normally-open auxiliary contact QF2 and a trip coil TQ are connected in series, a trip position relay TWJ is connected in parallel with a breaker normally-open auxiliary contact QF2, one end of a trip wire breaking monitoring relay TDJJ is connected with a direct current operating power supply, and the other end of the trip wire breaking monitoring relay TDJJ is connected with the trip coil through the cable and the breaker normally-open auxiliary contact QF 2.
2. The circuit breaker on/off full condition monitoring operation circuit of claim 1, wherein: the closing and breaking monitoring relay HDJJ, the cable, the closing position relay HWJ and the closing coil HQ are sequentially connected in series to form a breaking monitoring branch after the closing loop is closed; the switching-on and breaking monitoring relay HDJJ, the cable, the breaker normally-closed auxiliary contact QF1 and the switching-on coil HQ are sequentially connected in series to form a monitoring branch after the switching-on loop trips, and the two monitoring branches jointly form full-working-condition monitoring on the switching-on loop.
3. The circuit breaker on/off full condition monitoring operation circuit of claim 1, wherein: the trip disconnection monitoring relay TDJJ, the cable, the trip position relay TWJ and the trip coil TQ are sequentially connected in series to form a disconnection monitoring branch circuit after the trip loop trips; the trip disconnection monitoring relay TDJJ, the cable, the normally open auxiliary contact QF2 of the circuit breaker and the trip coil TQ are sequentially connected in series to form a monitoring branch circuit after the trip circuit is switched on, and the two monitoring branch circuits jointly form full-working-condition monitoring on the trip circuit.
CN202210276713.5A 2022-03-21 2022-03-21 Circuit breaker closes trip full operating mode and keeps watch on operation return circuit Pending CN115047327A (en)

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CN202210276713.5A CN115047327A (en) 2022-03-21 2022-03-21 Circuit breaker closes trip full operating mode and keeps watch on operation return circuit

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CN202210276713.5A CN115047327A (en) 2022-03-21 2022-03-21 Circuit breaker closes trip full operating mode and keeps watch on operation return circuit

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