CN111641195A - Circuit breaker body three-phase inconsistent protection misoperation prevention loop with monitoring function - Google Patents
Circuit breaker body three-phase inconsistent protection misoperation prevention loop with monitoring function Download PDFInfo
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- CN111641195A CN111641195A CN202010522934.7A CN202010522934A CN111641195A CN 111641195 A CN111641195 A CN 111641195A CN 202010522934 A CN202010522934 A CN 202010522934A CN 111641195 A CN111641195 A CN 111641195A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The invention discloses a circuit breaker body three-phase inconsistent protection misoperation prevention loop with a monitoring function. The loop comprises a first starting loop, a second starting loop, a first outlet loop, a second outlet loop, a first monitoring loop, a second monitoring loop, a first direct current power supply and a second direct current power supply; the starting circuit comprises a contact combination and a time relay coil which are connected in series at two ends of the direct-current power supply, a pair of normally open contacts and a tripping relay coil of two time relays which are connected in series at two ends of the direct-current power supply, and normally closed contacts of a monitoring relay which are connected in parallel at two ends of the normally open contacts of the time relays; the outlet loop comprises a normally open contact group of the tripping relay, and the first end of the normally open contact group is connected with the first end of the direct-current power supply after being combined by the contact; the monitoring circuit is connected in parallel with the two ends of the contact combination and comprises a monitoring relay coil. Compared with the prior art, the invention can not cause the false tripping of the outlet even if the outlet loop is conducted by mistake, and can effectively prevent the switch from being operated by mistake; the two loops are mutually independent, and the switch can be effectively prevented from refusing to operate.
Description
Technical Field
The embodiment of the invention relates to the technical field of circuit breakers, in particular to a circuit breaker body three-phase inconsistent protection misoperation prevention loop with a monitoring function.
Background
In a power system, the condition of inconsistent operation of three phases of a circuit breaker is frequent, and the stability of the system is seriously influenced. In order to avoid damage to a system caused by three-phase inconsistency of a breaker body, 220kV and above line breakers are required to be provided with three-phase inconsistency protection of the breaker body.
The three-phase inconsistent protection circuit of the circuit breaker body of 220kV or above in the existing operation adopts the scheme that the same circuit breaker is provided with two sets of three-phase inconsistent protection circuits of the same body. However, due to the reasons of complex wiring, bad operation environment and the like, the problems of poor contact or misconduction of the auxiliary contact of the circuit breaker, insulation damage of cable wiring, short circuit inside the relay and the like exist, and the false operation of the three-phase inconsistent protection circuit is easily caused. When the above conditions happen to any one of the two sets, the outlet is directly tripped, and the circuit breaker in operation is not planned to be disconnected. Directly connecting the junctions of the two outlet circuits in series also causes the problem of protection circuit failure due to a set of circuit faults.
The existing circuit breaker body three-phase inconsistent protection circuit malfunctions and action refusal events happen frequently, and the requirement of safe operation of a power grid cannot be met.
Disclosure of Invention
The invention provides a three-phase inconsistent protection misoperation prevention loop of a circuit breaker body with a monitoring function, which effectively prevents misoperation and refusal of the protection loop and meets the requirement of system stability.
The embodiment of the invention provides a circuit breaker body three-phase inconsistent protection misoperation prevention loop which comprises a first starting loop, a second starting loop, a first outlet loop, a second outlet loop, a first monitoring loop, a second monitoring loop, a first direct current power supply and a second direct current power supply, wherein the first starting loop is connected with the first monitoring loop; the first and second time relay are connected with the first and second monitoring relay respectively; the first time relay comprises a first time relay coil, a first time relay normally open contact and a first time relay normally open contact; the first tripping relay comprises a first tripping relay coil and a first tripping relay normally open contact group; the first monitor relay includes a first monitor relay coil and a first monitor relay first normally closed contact; the second time relay comprises a second time relay coil, a second time relay first normally open contact and a second time relay second normally open contact; the second tripping relay comprises a second tripping relay coil and a second tripping relay normally open contact group; the second monitor relay includes a second monitor relay coil and a second monitor relay first normally closed contact;
the first start loop comprises the first contact combination, the first time relay coil, the first time relay first normally open contact, the second time relay second normally open contact, the first trip relay coil, and the first monitor relay first normally closed contact; wherein a first end of the first contact combination is electrically connected with a first end of the first direct current power supply, a second end of the first contact combination is electrically connected with a first end of the first time relay coil, and a second end of the first time relay coil is electrically connected with a second end of the first direct current power supply; a first end of a first normally open contact of the first time relay is electrically connected with a first end of the first direct-current power supply, a second end of a first tripping relay coil is electrically connected with a second end of the first direct-current power supply, and a second normally open contact of the second time relay and a first normally closed contact of the second monitoring relay are connected between a second end of the first normally open contact of the first time relay and the first end of the first tripping relay coil in parallel;
the first outlet loop comprises the first trip relay normally open contact set; a normally open contact in the first tripping relay normally open contact group is connected in parallel between the second end of the first contact group and the output end of the first outlet loop, and a signal output by the output end of the first outlet loop is used for controlling the on-off state of the circuit breaker;
the first monitoring loop includes the first monitoring relay coil connected in parallel across the first combination of contacts;
the second start loop comprises the second contact combination, the second time relay coil, the second time relay first normally open contact, the first time relay second normally open contact, the second trip relay coil, and the first monitor relay first normally closed contact; a first end of the second contact combination is electrically connected with a first end of the second direct current power supply, a second end of the second contact combination is electrically connected with a first end of the second time relay coil, and a second end of the second time relay coil is electrically connected with a second end of the second direct current power supply; a first end of a first normally open contact of the second time relay is electrically connected with a first end of the second direct-current power supply, a second end of a coil of the second tripping relay is electrically connected with a second end of the second direct-current power supply, and a second normally open contact of the first time relay and a first normally closed contact of the first monitoring relay are connected between a second end of the first normally open contact of the second time relay and the first end of the coil of the second tripping relay in parallel;
the second outlet loop comprises the second trip relay normally open contact set; a normally open contact in the second tripping relay normally open contact group is connected in parallel between the second end of the second contact group and the output end of the second outlet loop, and a signal output by the output end of the second outlet loop is used for controlling the on-off state of the circuit breaker;
the second monitoring loop includes the second monitoring relay coil connected in parallel across the second combination of contacts.
The embodiment of the invention is characterized in that a first outlet loop comprises a first tripping relay normally-open contact group, and a normally-open contact in the first tripping relay normally-open contact group is connected between the second end of a first contact combination and the output end of the first outlet loop in parallel; the second outlet loop comprises a second tripping relay normally-open contact group, and a normally-open contact in the second tripping relay normally-open contact group is connected between the second end of the second contact group and the output end of the second outlet loop in parallel; the first monitoring circuit includes a first monitoring relay coil connected in parallel across the first combination of contacts, and the second monitoring circuit includes a second monitoring relay coil connected in parallel across the second combination of contacts. Thus, the circuit breaker can be tripped only if the two starting loops are communicated simultaneously; when the circuit breaker normally operates, even if the phenomenon that the contact of an individual relay coil or an auxiliary contact of the relay coil is closed due to insulation damage or other reasons, the first outlet loop and the second outlet loop cannot be caused to generate misoperation; and good independence is kept between the two loops, when the three phases of the circuit breaker are not operated consistently, even if any starting loop is broken or any direct current power supply is power-off, the other loop cannot be influenced, and the switch cannot be refused. Therefore, the embodiment of the invention can effectively prevent the unplanned shutdown of the high-voltage line or equipment caused by the fact that the three-phase circuit breaker is directly tripped by the misoperation of the protection circuit, can effectively prevent the protection circuit from refusing to operate when the three phases of the circuit breaker are inconsistent, ensures the safe operation of a power grid, and meets the requirement of the stability of the system.
Drawings
Fig. 1 is a circuit topology diagram of a three-phase inconsistent protection anti-misoperation loop of a circuit breaker body with a monitoring function according to a first embodiment of the present invention;
fig. 2 is a circuit topology diagram of a three-phase inconsistent protection anti-misoperation loop of a circuit breaker body with a monitoring function according to a second embodiment of the present invention;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a circuit topology diagram of a three-phase inconsistency protection anti-malfunction circuit of a circuit breaker body with a monitoring function according to an embodiment of the present invention. As shown in fig. 1, the circuit breaker body three-phase inconsistency protection anti-malfunction circuit with a monitoring function includes:
a first start-up loop 110, a second start-up loop 210, a first outlet loop 120, a second outlet loop 220, a first monitoring loop 130, a second monitoring loop 230, a first DC power supply and a second DC power supply; a first contact set 111, a second contact set 211, a first time relay, a second time relay, a first trip relay, a second trip relay, a first monitor relay, and a second monitor relay; the first time relay comprises a first time relay coil KT1-X, a first time relay first normally open contact KT1-1 and a first time relay second normally open contact KT 1-2; the first tripping relay comprises a first tripping relay coil KM1-X and a first tripping relay normally open contact set 121; the first monitoring relay includes a first monitoring relay coil SLJ1-X and a first monitoring relay first normally closed contact SLJ 1-1; the second time relay comprises a second time relay coil KT2-X, a second time relay first normally open contact KT2-1 and a second time relay second normally open contact KT 2-2; the second tripping relay comprises a second tripping relay coil KM2-X and a second tripping relay normally-open contact group 221; the second watchdog relay includes a second watchdog relay coil SLJ2-X and a second watchdog relay first normally closed contact SLJ 2-1.
Wherein, first direct current power supply includes: a first terminal 101 of a first dc power supply and a second terminal 102 of the first dc power supply, the second dc power supply comprising: a first terminal 201 of the second dc power supply and a second terminal 202 of the second dc power supply; the first terminal 101 of the first dc power supply and the second terminal 102 of the first dc power supply are dc positive and negative power terminals of the first group of control loops, and are used for supplying power to the first start loop 110, the first exit loop 120 and the first monitoring loop 130; the first terminal 201 of the second dc power supply and the second terminal 202 of the second dc power supply are dc positive and negative power terminals of the second set of control loops for supplying power to the second start loop 210, the second exit loop 220 and the second monitoring loop 230. Optionally, the first dc power supply and the second dc power supply are the same dc power supply, and the first terminal 101 of the first dc power supply, the second terminal 102 of the first dc power supply, the first terminal 201 of the second dc power supply, and the second terminal 202 of the second dc power supply are different terminals of the same dc power supply.
A coil KT1-X of a first time relay connected by a dotted line and two normally open contacts KT1-1 and KT1-2 controlled by the coil are encapsulated in a whole to form the first time relay, and when the coil KT1-X of the first time relay is electrified and excited, the first normally open contact KT1-1 and the second normally open contact KT1-2 of the first time relay are closed; a coil KT2-X of the second time relay connected by a dotted line and two normally open contacts KT2-1 and KT2-2 controlled by the coil are packaged in a whole to form a second time relay, and when the coil KT2-X of the second time relay is electrified and excited, the first normally open contact KT2-1 and the second normally open contact KT2-2 of the second time relay are closed; a coil KM1-X of the first tripping relay connected by a dotted line and a normally open contact set 121 of the first tripping relay controlled by the coil form the first tripping relay; the coil KM2-X of the second trip relay connected by a dotted line and the second trip relay normally open contact set 221 controlled by the coil constitute a second trip relay.
Specifically, the first monitoring relay is a high-resistance relay and is used for preventing the circuit breaker from starting the first time relay by mistake when working normally; the second monitoring relay is a high-resistance relay and is used for preventing the second time relay from being started by mistake when the circuit breaker works normally.
The first starting loop 110 comprises a first contact combination 111, a first time relay coil KT1-X, a first time relay first normally open contact KT1-1, a second time relay second normally open contact KT2-2, a first tripping relay coil KM1-X and a second monitoring relay first normally closed contact SLJ 2-1; wherein, the first end of the first contact combination 111 is electrically connected with the first end 101 of the first DC power supply, the second end of the first contact combination 111 is electrically connected with the first end of the first time relay coil KT1-X, and the second end of the first time relay coil KT1-X is electrically connected with the second end 102 of the first DC power supply; the first end of a first time relay first normally open contact KT1-1 is electrically connected with a first end 101 of a first direct-current power supply, the second end of a first tripping relay coil KM1-X is electrically connected with a second end 102 of the first direct-current power supply, and a second time relay second normally open contact KT2-2 and a second monitoring relay first normally closed contact SLJ2-1 are connected between the second end of the first time relay first normally open contact KT1-1 and the first end of the first tripping relay coil KM1-X in parallel.
Illustratively, the first contact set 111 includes a first normally open auxiliary contact set CK1 and a first normally closed auxiliary contact set CB1 connected in series.
The on-off state of the normally open auxiliary contact in the first normally open auxiliary contact group CK1 is always consistent with the actual on-off state of the circuit breaker, namely the normally open auxiliary contact is closed when the circuit breaker operates normally; the opening and closing state of the normally closed auxiliary contact in the first normally closed auxiliary contact group CB1 is always kept opposite to the actual opening and closing state of the circuit breaker, namely the normally closed auxiliary contact is opened when the circuit breaker normally operates.
Specifically, the first starting circuit 110 is used for being connected when the circuit breaker generates three-phase inconsistent operation, so that the circuit breaker is connected into the circuit; the first time relay is used for starting timing when the first starting loop 110 is electrified, and closing the first normally open contact KT1-1 and the second normally open contact KT1-2 of the first time relay after the timing reaches the setting time.
The first outlet loop 120 includes a first trip relay normally open contact set 121; the normally open contact in the first trip relay normally open contact group 121 is connected in parallel between the second end of the first contact group 111 and the output end of the first outlet loop 120, and the signal output by the output end of the first outlet loop is used for controlling the on-off state of the circuit breaker.
Specifically, the first outlet loop 120 is configured to, when the breaker three-phase inconsistent operation is performed, energize and excite the first trip relay coil KM1-X, control the first trip relay normally-open contact group 121 to be closed, turn on the first outlet loop 120, control the breaker to trip, and end the three-phase inconsistent state of the breaker.
The first monitoring circuit 130 includes a first monitoring relay coil SLJ1-X, which SLJ1-X is connected in parallel across the first junction group 111.
Specifically, the first monitoring circuit 130 is configured to monitor a normal state of the first start-up circuit 110 and the first dc power supply; when the first monitoring relay coil SLJ1-X is electrified and excited, the first normally closed contact SLJ1-1 of the first monitoring relay is controlled to be opened.
The second starting loop 210 comprises a second contact combination 211, a second time relay coil KT2-X, a second time relay first normally open contact KT2-1, a first time relay second normally open contact KT1-2, a second tripping relay coil KM2-X and a first monitoring relay first normally closed contact SLJ 1-1; a first end of the second contact combination 211 is connected with a first end electric 201 of the second direct current power supply, a second end of the second contact combination 211 is electrically connected with a first end of a second time relay coil KT2-X, and a second end of the second time relay coil KT2-X is electrically connected with a second end 202 of the second direct current power supply; the first end of a first normally open contact KT2-1 of the second time relay is electrically connected with the first end 201 of a second direct-current power supply, the second end of a second tripping relay coil KM2-X is electrically connected with the second end 202 of the second direct-current power supply, and a second normally open contact KT1-2 of the first time relay and a first normally closed contact SLJ1-1 of the first monitoring relay are connected between the second end of a first normally open contact KT2-1 of the second time relay and the first end of a second tripping relay coil KM2-X in parallel.
Illustratively, the second contact set 211 includes a second normally open auxiliary contact set CK2 and a second normally closed auxiliary contact set CB2 connected in series.
The opening and closing state of the normally open auxiliary contact in the second normally open auxiliary contact group CK2 is always consistent with the actual opening and closing state of the circuit breaker, namely the normally open auxiliary contact is closed when the circuit breaker operates normally; the opening and closing state of the normally closed auxiliary contact in the second normally closed auxiliary contact group CB2 is always kept opposite to the actual opening and closing state of the circuit breaker, namely the normally closed auxiliary contact is opened when the circuit breaker normally operates.
Specifically, the second starting circuit 210 is used for communicating when the circuit breaker generates three-phase inconsistent operation, so that the circuit breaker is connected into the circuit; the second time relay is used for starting timing when the second starting loop 210 is electrified, and closing the first normally open contact KT2-1 and the second normally open contact KT2-2 of the second time relay after the timing reaches the setting time.
The second outlet circuit 220 includes a second trip relay normally open contact set 221; and a normally open contact in the second tripping relay normally open contact group 221 is connected in parallel between the second end of the second contact group 211 and the output end of the second outlet loop 220, and a signal output by the output end of the second outlet loop is used for controlling the on-off state of the circuit breaker.
Specifically, the second outlet loop 220 is used for energizing and exciting the second trip relay coil KM2-X when the three phases of the circuit breaker are not in consistent operation, controlling the normally open contact group 221 of the second trip relay to be closed, conducting the second outlet loop 220, controlling the circuit breaker to trip, and ending the three-phase inconsistent state of the circuit breaker.
The second monitoring circuit 230 includes a second monitoring relay coil SLJ2-X, which SLJ2-X is connected in parallel across the second junction group 211.
Specifically, the second monitoring circuit 230 is configured to monitor the normal states of the second start-up circuit 210 and the second dc power supply; when the second monitoring relay coil SLJ2-X is electrified and excited, the first normally closed contact SLJ2-1 of the second monitoring relay is controlled to be opened.
Optionally, the circuit breaker is a three-phase circuit breaker;
the first normally-open auxiliary contact group CK1 comprises an A-phase normally-open auxiliary contact CK1-A, B phase normally-open auxiliary contact CK1-B and a C-phase normally-open auxiliary contact CK1-C which are connected in parallel; the first normally-closed auxiliary contact group CB1 comprises an A-phase normally-closed auxiliary contact CB1-A, B, an A-phase normally-closed auxiliary contact CB1-B and a C-phase normally-closed auxiliary contact CB1-C which are connected in parallel;
the second normally-open auxiliary contact group CK2 comprises an A-phase normally-open auxiliary contact CK2-A, B phase normally-open auxiliary contact CK2-B and a C-phase normally-open auxiliary contact CK2-C which are connected in parallel; the second normally-closed auxiliary contact group CB2 comprises an A-phase normally-closed auxiliary contact CB2-A, B, an A-phase normally-closed auxiliary contact CB2-B and a C-phase normally-closed auxiliary contact CB2-C which are connected in parallel.
The circuit breaker auxiliary contact is arranged in a mechanism box of each phase of circuit breaker, and is mechanically connected with a circuit breaker opening and closing moving contact by adopting a metal connecting rod and used for reflecting the opening and closing state of the circuit breaker in real time; all the contacts are controlled by the breaker opening and closing moving contacts in a unified way and simultaneously displace.
Optionally, the circuit breaker is a three-phase circuit breaker;
the first tripping relay normally-open contact group 121 comprises an A-phase first tripping relay normally-open contact KM1-1, a B-phase first tripping relay normally-open contact KM1-2 and a C-phase first tripping relay normally-open contact KM 1-3; the second tripping relay normally-open contact group 221 comprises an A-phase second tripping relay normally-open contact KM2-1, a B-phase second tripping relay normally-open contact KM2-2 and a C-phase second tripping relay normally-open contact KM 2-3.
When the coil of the tripping relay is electrified and excited, the normally open contact controlled by the coil is closed.
The working principle of the three-phase inconsistent protection misoperation prevention loop of the circuit breaker body with the monitoring function is as follows:
1. when the three phases of the circuit breaker are fully shared, normally open auxiliary contacts in the first normally open auxiliary contact group CK1 and the second normally open auxiliary contact group CK2 are both opened, normally closed auxiliary contacts in the first normally closed auxiliary contact group CB1 and the second normally closed auxiliary contact group CB2 are both closed, and two ends of the first contact group 111 and the second contact group 211 are in an open state, so that the first starting circuit 110 and the second starting circuit 210 are not conducted; since the outlet loop is connected to the first end of the dc power source after the combination of the contacts, the first outlet loop 120 and the second outlet loop 220 are not powered; because the first monitoring circuit 130 is connected in parallel with two ends of the first contact combination 111, the second end 102 of the first direct current power supply is connected through the first time relay coil KT1-X, the first monitoring circuit 130 is conducted and is used for monitoring the normal state of the first starting circuit 110 and the first direct current power supply, and the first monitoring relay coil SLJ1-X is electrified and excited; since the second monitoring circuit 230 is connected in parallel to both ends of the second contact group 211, the second monitoring circuit 230 is connected to the second end 202 of the second dc power supply through the second time relay coil KT2-X, and is turned on to monitor the normal state of the second start circuit 210 and the second dc power supply, and the second monitoring relay coil SLJ2-X is energized and excited.
2. When the circuit breaker normally operates, namely three phases are full, normally open auxiliary contacts in the first normally open auxiliary contact group CK1 and the second normally open auxiliary contact group CK2 are both closed, normally closed auxiliary contacts in the first normally closed auxiliary contact group CB1 and the second normally closed auxiliary contact group CB2 are both opened, and two ends of the first contact group 111 and two ends of the second contact group 211 are in an open state, so that the first starting circuit 110 and the second starting circuit 210 are not conducted; as the first trip relay coil KM1-X and the second trip relay coil KM2-X are not excited, and the first trip relay normally open contact group 121 and the second trip relay normally open contact group 221 are both in an off state, the first outlet loop 120 and the second outlet loop 220 are not conductive; because the first monitoring circuit 130 is connected in parallel to the two ends of the first contact combination 111, the second end 102 of the first dc power supply is connected through the first time relay coil KT1-X, and the first monitoring circuit 130 is conducted to monitor the normal state of the first start circuit 110 and the first dc power supply; the second monitoring circuit 230 is connected in parallel to two ends of the second contact combination 211, and is connected to the second end 202 of the second dc power supply through the second time relay coil KT2-X, and the second monitoring circuit 230 is turned on, so as to monitor the normal states of the second start circuit 210 and the second dc power supply;
at the moment, if the normally open contact of the relay at a certain time is closed due to the reasons of the fault conduction of the auxiliary contact of the circuit breaker in a certain starting circuit, the insulation damage of the cable connection between the auxiliary contact and the relay or the internal short circuit of the relay, and the like, if the first contact combination 111 is conducted by mistake, the coil KT1-X of the first time relay is excited, so that the first normally open contact KT1-1 and the second normally open contact KT1-2 of the first time relay are closed; however, the normally open contacts of the time relays in the two starting loops are connected in series in a one-to-one correspondence manner, at the moment, the second starting loop 210 is normally not conducted, the first normally open contact KT2-1 of the second time relay and the second normally open contact KT2-2 of the second time relay are not closed, so that the first tripping relay coil KM1-X and the second tripping relay coil KM2-X are not electrified, the first tripping relay normally open contact group 121 and the second tripping relay normally open contact group 221 are both kept in an open state, and the first outlet loop 120 and the second outlet loop 220 cannot be in misoperation;
at this time, if a certain outlet circuit is conducted by mistake due to a malfunction of the trip relay or a mistake of a worker, if the a-phase first trip relay normally open contact KM1-1 in the first outlet circuit 120 is closed, the first outlet circuit 120 is not electrified because the first contact combination 111 is not normally conducted, and the circuit breaker is not tripped due to the malfunction.
3. When the three-phase inconsistent operation of the circuit breaker, namely one-phase split two-phase combined operation or one-phase split two-phase combined operation, such as the A-phase split operation, the B-phase split operation and the C-phase split operation of the circuit breaker, the A-phase normally-open auxiliary contact CK1-A and the CK2-A in the first normally-open auxiliary contact group CK1 and the second normally-open auxiliary contact group CK2 are disconnected, the A-phase normally-closed auxiliary contact CB1-A and the CB2-A in the first normally-closed auxiliary contact group CB1 and the second normally-closed auxiliary contact group CB2 are closed, so that both ends of the first contact group 111 and the second contact group 211 are conducted, the first time relay coil KT1-X and the second time relay coil KT 24-X are both electrified and excited, and when the electrifying time reaches the setting time, the first normally-open contact 1-1, the second normally-open contact of the first time relay, the first time relay KT relay 1-2, the second time relay normally-open contact 2-1 and the second time relay 22, closing the first tripping relay coil KM1-X and the second tripping relay coil KM2-X, energizing and exciting, controlling the normally open contact group 121 of the first tripping relay coil and the normally open contact group 221 of the second tripping relay coil to be closed, tripping off the three-phase breaker, and finishing the inconsistent state of the three-phase breaker; when the three-phase tripping is completed, the first contact assembly 111 and the second contact assembly 211 are reset to the off state again, the first time relay, the second time relay, the first tripping relay and the second tripping relay are all powered off and reset, and the first monitoring loop 130 and the second monitoring loop 230 still work normally.
When the three phases of the circuit breaker are inconsistent to operate, if a loop where a contact combination in a certain starting loop is located is disconnected, or a certain end of a certain direct current power supply loses power to cause the corresponding starting loop to be disconnected, if the first end 101 of the first direct current power supply loses power, the first starting loop 110 is disconnected, and the first time relay coil KT1-X loses power, so that the first time relay first normally-open contact KT1-1 and the first time relay second normally-open contact KT1-2 are disconnected, the first tripping relay coil KM1-X cannot be powered, the first tripping relay normally-open contact group 121 cannot be closed, and the first outlet loop 120 cannot normally control the circuit breaker to trip; however, at this time, since the first end 101 of the first dc power supply loses power, the first monitoring circuit 130 is not powered, and the first monitoring relay coil SLJ1-X loses power, the first normally closed contact SLJ1-1 of the first monitoring relay is closed, and the second normally open contact KT1-2 of the first time relay is shorted, so that the three-phase circuit breaker can be disconnected by the action of the second outlet circuit as long as the second power supply normally operates and the second start circuit and the second outlet circuit are normally conducted, and the three-phase inconsistent operation state is ended.
According to the technical scheme of the embodiment, two sets of starting loops are started through respective independent contact combinations, meanwhile, the two starting loops are connected in series by normally open contacts of two time relays in a one-to-one correspondence mode, only when a breaker is really in a three-phase inconsistent state and the three phases need to be tripped off, the two starting loops are conducted, and only when the two outlet loops act, the outlets can be tripped; and the outlet loop is connected with the first end of the direct current power supply through the contact combination, so that the problem of false operation of a three-phase inconsistent protection loop of the circuit breaker body is solved, the high-voltage line or equipment unplanned shutdown caused by the fact that the false operation of the protection loop directly trips the three-phase circuit breaker is effectively prevented, the safe operation of a power grid is ensured, and the requirement of system stability is met. In addition, the first monitoring relay and the second monitoring relay are additionally arranged, so that the independence between the two loops is ensured, if any one starting loop is disconnected or any one direct-current power supply end is abnormal in power failure, the normal operation of the other loop cannot be interfered, and the protection refusal is effectively prevented.
Example two
In this embodiment, based on the above embodiment, an alarm circuit, a trip coil and a resistor are added on the basis of the above embodiment, and fig. 2 is a circuit topology diagram of a three-phase inconsistent protection anti-malfunction circuit of a circuit breaker body with a monitoring function according to a second embodiment of the present invention, referring to fig. 2, the same or corresponding terms as those in the above embodiment are explained, and no further description is given in this embodiment.
This inconsistent protection of circuit breaker body three-phase that possesses monitoring function prevents maloperation return circuit still includes: an alarm loop 310; the first monitoring relay further comprises a first monitoring relay second normally closed contact SLJ1-2, the second monitoring relay further comprises a second monitoring relay second normally closed contact SLJ 2-2; the alarm circuit 310 comprises a first monitoring relay second normally closed contact SLJ1-2, a second monitoring relay second normally closed contact SLJ2-2 and a third direct current power supply; the first monitoring relay second normally closed contact SLJ1-2 and the second monitoring relay second normally closed contact SLJ2-2 are connected between the first end 301 of the third direct current power supply and the output end of the alarm loop 310 in parallel; the output of the alarm loop 310 is used to control a three-phase inconsistent start loop fault alarm.
Specifically, the operating principle of the alarm loop 310 is as follows:
1. when the first starting circuit 110, the second starting circuit 210, the first direct current power supply and the second direct current power supply are normal, the first monitoring relay coil SLJ1-X and the second monitoring relay coil SLJ2-X are electrified and excited, the first monitoring relay second normally closed contact SLJ1-2 and the second monitoring relay second normally closed contact SLJ2-2 in the alarm circuit 310 are both disconnected, the alarm circuit 310 is not conducted, and the first starting circuit fault alarm and the second starting circuit fault alarm signal are not sent.
2. When the circuit where the first contact combination 111 is located in the first starting circuit 110 is disconnected, or any end of the first direct current power supply loses power, the first monitoring relay coil SLJ1-X loses power, the second normally closed contact SLJ1-2 of the first monitoring relay in the alarm circuit 310 is closed, the circuit is conducted, and the output end controls and sends a first starting circuit fault alarm signal.
3. When the circuit where the second contact combination 211 in the second starting circuit 210 is located is disconnected, or any end of the second direct current power supply loses power, the first monitoring relay coil SLJ1-X loses power, the second normally closed contact SLJ1-2 of the first monitoring relay in the alarm circuit 310 is closed, the circuit is conducted, and the output end controls and sends a first starting circuit fault alarm signal.
4. When a circuit where the first contact combination 111 in the first starting circuit 110 is located is disconnected, or any end of the first direct current power supply loses power, and a circuit where the second contact combination 211 in the second starting circuit 210 is located is disconnected, or any end of the second direct current power supply loses power, the first monitoring relay coil SLJ1-X and the second monitoring relay coil SLJ2-X both lose power, the first monitoring relay second normally-closed contact SLJ1-2 and the second monitoring relay second normally-closed contact SLJ2-2 in the alarm circuit 310 are both closed, the alarm circuit 310 is conducted, and the output end controls and sends a first starting circuit fault alarm and a second starting circuit fault alarm signal.
This inconsistent protection of circuit breaker body three-phase that possesses monitoring function prevents maloperation return circuit still includes: a first trip coil set 122 and a second trip coil set 222; the second end of the first trip coil group 122 is electrically connected with the second end 102 of the first direct current power supply, and the first end of the trip coil in the first trip coil group 122 is electrically connected with the second end of the normally open contact in the first trip relay normally open contact group 121 in the first outlet loop 120 in a one-to-one correspondence manner; a second end of the second trip coil set 222 is electrically connected to the second end 202 of the second dc power source, and a first end of the trip coil in the second trip coil set 222 is electrically connected to a second end of the normally open contact in the second trip relay normally open contact set 221 in the second outlet loop 220 in a one-to-one correspondence.
The tripping coil in the tripping coil group is used for being electrified after the normally open contact of the tripping relay in the outlet loop is closed when the three phases of the circuit breaker are not consistent to operate, so that the circuit breaker is tripped.
Further, the first trip coil group 122 includes a-phase first trip coil TQA1, a B-phase first trip coil TQB1, and a C-phase first trip coil TQC 1; the second trip coil group 222 includes an a-phase second trip coil TQA2, a B-phase second trip coil TQB2, and a C-phase second trip coil TQC 2.
In the three-phase inconsistency protection misoperation prevention circuit of the circuit breaker body with the monitoring function, the first monitoring circuit 130 further comprises a first resistor R1, and the first resistor R1 and a first monitoring relay coil SLJ1-X are connected in series at two ends of the first contact combination 111; the second monitoring 230 loop also includes a second resistor R2, the second resistor R2 being connected in series with the second monitoring relay coil SLJ2-X across the second junction group 211.
Specifically, the first resistor R1 in the first monitoring circuit 130 is used for, when the first monitoring relay coil SLJ1-X is short-circuited, the first resistor R1 serves as a voltage dividing resistor, and the first time relay is not started by mistake, and the size of the first resistor R1 is not limited in the embodiment of the present invention; the second resistor R2 in the second monitoring circuit 230 is configured to, when the second monitoring relay coil SLJ2-X is short-circuited, the second resistor R2 serves as a voltage dividing resistor, so that the second time relay is not erroneously activated.
According to the technical scheme of the embodiment, on the basis of achieving the technical effects of the embodiment, the alarm loop is added, the abnormal monitoring and alarm functions of the direct-current power supply and the starting loop are achieved, and operating personnel can be reminded to handle faults of the starting loop and the direct-current power supply in time; in addition, a first resistor and a second resistor are additionally arranged to be used as voltage dividing resistors, and therefore the time relay is effectively prevented from being started by mistake when a coil of the monitoring relay is short-circuited.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A three-phase inconsistent protection misoperation prevention loop of a circuit breaker body with a monitoring function is characterized by comprising a first starting loop, a second starting loop, a first outlet loop, a second outlet loop, a first monitoring loop, a second monitoring loop, a first direct current power supply and a second direct current power supply; the first and second time relay are connected with the first and second monitoring relay respectively; the first time relay comprises a first time relay coil, a first time relay normally open contact and a first time relay normally open contact; the first tripping relay comprises a first tripping relay coil and a first tripping relay normally open contact group; the first monitor relay includes a first monitor relay coil and a first monitor relay first normally closed contact; the second time relay comprises a second time relay coil, a second time relay first normally open contact and a second time relay second normally open contact; the second tripping relay comprises a second tripping relay coil and a second tripping relay normally open contact group; the second monitor relay includes a second monitor relay coil and a second monitor relay first normally closed contact;
the first start loop comprises the first contact combination, the first time relay coil, the first time relay first normally open contact, the second time relay second normally open contact, the first trip relay coil, and the second monitor relay first normally closed contact; wherein a first end of the first contact combination is electrically connected with a first end of the first direct current power supply, a second end of the first contact combination is electrically connected with a first end of the first time relay coil, and a second end of the first time relay coil is electrically connected with a second end of the first direct current power supply; a first end of a first normally open contact of the first time relay is electrically connected with a first end of the first direct-current power supply, a second end of a first tripping relay coil is electrically connected with a second end of the first direct-current power supply, and a second normally open contact of the second time relay and a first normally closed contact of the second monitoring relay are connected between a second end of the first normally open contact of the first time relay and the first end of the first tripping relay coil in parallel;
the first outlet loop comprises the first trip relay normally open contact set; a normally open contact in the first tripping relay normally open contact group is connected in parallel between the second end of the first contact group and the output end of the first outlet loop, and a signal output by the output end of the first outlet loop is used for controlling the on-off state of the circuit breaker;
the first monitoring loop includes the first monitoring relay coil connected in parallel across the first combination of contacts;
the second start loop comprises the second contact combination, the second time relay coil, the second time relay first normally open contact, the first time relay second normally open contact, the second trip relay coil, and the first monitor relay first normally closed contact; a first end of the second contact combination is electrically connected with a first end of the second direct current power supply, a second end of the second contact combination is electrically connected with a first end of the second time relay coil, and a second end of the second time relay coil is electrically connected with a second end of the second direct current power supply; a first end of a first normally open contact of the second time relay is electrically connected with a first end of the second direct-current power supply, a second end of a coil of the second tripping relay is electrically connected with a second end of the second direct-current power supply, and a second normally open contact of the first time relay and a first normally closed contact of the first monitoring relay are connected between a second end of the first normally open contact of the second time relay and the first end of the coil of the second tripping relay in parallel;
the second outlet loop comprises the second trip relay normally open contact set; a normally open contact in the second tripping relay normally open contact group is connected in parallel between the second end of the second contact group and the output end of the second outlet loop, and a signal output by the output end of the second outlet loop is used for controlling the on-off state of the circuit breaker;
the second monitoring loop includes the second monitoring relay coil connected in parallel across the second combination of contacts.
2. The circuit breaker body three-phase inconsistency protection false-operation prevention circuit with a monitoring function according to claim 1, further comprising an alarm circuit; the first monitoring relay further comprises a first monitoring relay second normally closed contact, the second monitoring relay further comprises a second monitoring relay second normally closed contact; the alarm circuit comprises a second normally closed contact of the first monitoring relay, a second normally closed contact of the second monitoring relay and a third direct-current power supply; the second normally closed contact of the first monitoring relay and the second normally closed contact of the second monitoring relay are connected between the first end of the third direct-current power supply and the output end of the alarm circuit in parallel; and the output end of the alarm loop is used for controlling the three-phase inconsistent starting loop to perform fault alarm.
3. The three-phase inconsistent protection false-action-preventing circuit of the circuit breaker body with the monitoring function according to claim 1, wherein the first contact combination comprises a first normally-open auxiliary contact group and a first normally-closed auxiliary contact group which are connected in series; the second contact combination comprises a second normally open auxiliary contact group and a second normally closed auxiliary contact group which are connected in series.
4. The circuit breaker body three-phase inconsistency protection false-operation prevention circuit with monitoring function according to claim 3, wherein the circuit breaker is a three-phase circuit breaker;
the first normally-open auxiliary contact group comprises an A-phase normally-open auxiliary contact, a B-phase normally-open auxiliary contact and a C-phase normally-open auxiliary contact which are connected in parallel; the first normally closed auxiliary contact group comprises an A-phase normally closed auxiliary contact, a B-phase normally closed auxiliary contact and a C-phase normally closed auxiliary contact which are connected in parallel;
the second normally-open auxiliary contact group comprises an A-phase normally-open auxiliary contact, a B-phase normally-open auxiliary contact and a C-phase normally-open auxiliary contact which are connected in parallel; the second normally closed auxiliary contact group comprises an A-phase normally closed auxiliary contact, a B-phase normally closed auxiliary contact and a C-phase normally closed auxiliary contact which are connected in parallel.
5. The circuit breaker body three-phase nonconformity protection false-operation prevention circuit with monitoring function according to claim 4, wherein the breaker auxiliary contact is provided in each phase breaker mechanism box.
6. The circuit breaker body three-phase inconsistency protection false-operation prevention circuit with monitoring function according to claim 1, wherein the circuit breaker is a three-phase circuit breaker;
the first tripping relay normally-open contact group comprises an A-phase first tripping relay normally-open contact, a B-phase first tripping relay normally-open contact and a C-phase first tripping relay normally-open contact; and the second tripping relay normally-open contact group comprises an A-phase second tripping relay normally-open contact, a B-phase second tripping relay normally-open contact and a C-phase second tripping relay normally-open contact.
7. The circuit breaker body three-phase inconsistency protection false-operation prevention circuit with a monitoring function according to claim 1, further comprising a first trip coil set and a second trip coil set; the second end of the first tripping coil group is electrically connected with the second end of the first direct-current power supply, and the first end of the tripping coil in the first tripping coil group is electrically connected with the second end of the normally open contact in the normally open contact group of the first tripping relay in the first outlet loop in a one-to-one correspondence manner; and the second end of the second tripping coil group is electrically connected with the second end of the second direct-current power supply, and the first end of the tripping coil in the second tripping coil group is electrically connected with the second end of the normally open contact in the second tripping relay normally open contact group in the second outlet loop in a one-to-one correspondence manner.
8. The circuit breaker body three-phase inconsistency protection false-operation prevention circuit with a monitoring function according to claim 7, wherein the first trip coil group comprises an A-phase first trip coil, a B-phase first trip coil and a C-phase first trip coil; the second tripping coil group comprises an A-phase second tripping coil, a B-phase second tripping coil and a C-phase second tripping coil.
9. The circuit breaker body three-phase inconsistency protection false-operation prevention circuit with a monitoring function according to claim 1, wherein the first monitoring relay and the second monitoring relay are both high-resistance relays.
10. The circuit breaker body three-phase inconsistent protection false-action prevention circuit with monitoring function as claimed in claim 1, wherein said first monitoring circuit further comprises a first resistor, said first resistor and said first monitoring relay coil being connected in series across said first contact combination; the second monitoring circuit further includes a second resistor connected in series with the second monitoring relay coil across the second junction combination.
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