CN111682512B - Circuit breaker body three-phase inconsistent protection misoperation prevention loop and system - Google Patents
Circuit breaker body three-phase inconsistent protection misoperation prevention loop and system Download PDFInfo
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- CN111682512B CN111682512B CN202010522338.9A CN202010522338A CN111682512B CN 111682512 B CN111682512 B CN 111682512B CN 202010522338 A CN202010522338 A CN 202010522338A CN 111682512 B CN111682512 B CN 111682512B
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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
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Abstract
The invention discloses a circuit breaker body three-phase inconsistency protection misoperation prevention loop and system. The circuit breaker body three-phase inconsistency protection misoperation prevention loop comprises a first starting loop, a second starting loop, a first outlet loop, a second outlet loop, a first direct current power supply and a second direct current power supply; the starting loop comprises a contact combination and a time relay which are connected in series at two ends of the direct current power supply, and a normally open contact and a tripping relay of the time relay which are connected in series at two ends of the direct current power supply; the first end of the outlet loop is electrically connected with the first end of the direct-current power supply after being combined by the contact points, the outlet loop comprises respective normally open contact groups of the two tripping relays, and the normally open contacts are connected in series in a one-to-one correspondence mode. 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 false operation.
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 inconsistency protection misoperation prevention loop and system.
Background
In the power system, when the circuit breaker is not operated in full phase, namely three phases are not in consistent operation, a large negative sequence current is generated, 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 inconsistent protection of 220kV and above circuit breaker body three phases in the existing operation adopts double configuration, namely the same circuit breaker is provided with two sets of inconsistent protection loops of body three phases which are the same. However, due to the complex wiring, outdoor and open environment and other reasons, the operation environment of the three-phase inconsistent protection circuit is severe, and the problem that false operation is easy to occur exists. For example, tripping a three-phase circuit breaker directly, closing a reclosure, etc. 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.
Therefore, the current breaker body three-phase inconsistent protection circuit frequently generates error action events, and can not meet the requirement of safe operation of a power grid.
Disclosure of Invention
The embodiment of the invention provides a circuit breaker body three-phase inconsistent protection misoperation prevention loop and a system, which are used for effectively preventing misoperation of a protection loop and meeting the requirement of system stability.
In a first aspect, an embodiment of the present invention provides a circuit breaker body three-phase inconsistent protection anti-malfunction circuit, including a first start circuit, a second start circuit, a first outlet circuit, a second outlet circuit, a first dc power supply, and a second dc power supply; the relay comprises a first contact combination, a second contact combination, a first time relay, a second time relay, a first tripping relay and a second tripping relay; the first time relay comprises a first time relay coil and a first time relay normally open contact; the first tripping relay comprises a first tripping relay coil, a first group of first tripping relay normally open contacts and a second group of first tripping relay normally open contacts; the second time relay comprises a second time relay coil and a second time relay normally open contact; the second tripping relay comprises a second tripping relay coil, a first group of second tripping relay normally open contacts and a second group of second tripping relay normally open contacts;
the first start loop comprises the first contact combination, the first time relay coil, the first time relay normally open contact and the first trip relay coil; 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; the first time relay normally-open contact and the first tripping relay coil are connected between the first end and the second end of the first direct-current power supply in series;
the first outlet loop comprises the first set of first trip relay normally open contacts and the second set of second trip relay normally open contacts; the first ends of the normally open contacts of the second set of second tripping relays are electrically connected with the second end of the first contact combination, the normally open contacts of the second set of second tripping relay normally open contacts and the normally open contacts of the first set of first tripping relay normally open contacts are correspondingly connected in series between the second end of the first contact combination and the output end of the first outlet loop in a one-to-one mode, and signals output by the output end of the first outlet loop are used for controlling the opening and closing state of the circuit breaker;
the second start loop comprises the second contact combination, the second time relay coil, the second time relay normally open contact and the second trip relay coil; 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; the second time relay normally-open contact and the second tripping relay coil are connected between the first end and the second end of the second direct-current power supply in series;
the second outlet loop comprises the second set of first trip relay normally open contacts and the first set of second trip relay normally open contacts; the first end of the normally open contact of the second group of first tripping relays is electrically connected with the second end of the second contact combination, the normally open contact of the second group of first tripping relays and the normally open contact of the first group of second tripping relays are connected in series between the second end of the second contact combination and the output end of the second outlet loop in a one-to-one correspondence mode, and signals output by the output end of the second outlet loop are used for controlling the on-off state of the circuit breaker.
In a second aspect, an embodiment of the present invention further provides a three-phase inconsistency protection misoperation prevention system for a circuit breaker body, including the three-phase inconsistency protection misoperation prevention circuit for the circuit breaker body provided in any embodiment of the present invention, and further including a circuit breaker and an external device connected to the three-phase inconsistency protection misoperation prevention circuit for the circuit breaker body.
The embodiment of the invention sets a first outlet loop to comprise a first group of normally open contacts of a first tripping relay and a second group of normally open contacts of a second tripping relay; normally open contacts in the normally open contacts of the second set of second tripping relays and normally open contacts in the normally open contacts of the first set of first tripping relays are connected in series between the second end of the first contact combination and the output end of the first outlet loop in a one-to-one correspondence mode; the second outlet loop comprises a second group of first tripping relay normally open contacts and a first group of second tripping relay normally open contacts; and the normally open contacts in the normally open contacts of the second group of first tripping relays and the normally open contacts in the normally open contacts of the first group of second tripping relays are connected in series between the second end of the second contact combination and the output end of the second outlet loop in a one-to-one correspondence mode. Therefore, the circuit breaker can be tripped only by the simultaneous action of the two outlet loops, and the first outlet loop and the second outlet loop can not generate misoperation even if the phenomenon of contact closing of individual relay coils or auxiliary contacts thereof is generated due to insulation damage or other reasons when the circuit breaker normally operates. 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, ensure the safe operation of the power grid and meet 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 according to an 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 according to a second embodiment of the present invention;
fig. 3 is a circuit topology diagram of a circuit breaker body three-phase inconsistent protection anti-malfunction circuit monitoring circuit according to the second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a three-phase inconsistency protection misoperation prevention system for a circuit breaker body according to a third 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 inconsistent protection anti-malfunction circuit of a circuit breaker body according to an embodiment of the present invention. As shown in fig. 1, the three-phase inconsistent protection anti-misoperation loop of the circuit breaker body comprises:
a first start-up loop 110, a second start-up loop 210, a first outlet loop 120, a second outlet loop 220, a first DC power supply, 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 and a second trip relay; the first time relay comprises a first time relay coil KT1-X and a first time relay normally open contact KT 1-1; the first trip relay comprises a first trip relay coil KM1-X, a first set of first trip relay normally open contacts 122, and a second set of first trip relay normally open contacts 221; the second time relay comprises a second time relay coil KT2-X and a second time relay normally open contact KT 2-1; the second trip relay includes a second trip relay coil KM2-X, a first set of second trip relay normally open contacts 222, and a second set of second trip relay normally open contacts 121.
Wherein, first direct current power supply includes: first direct current power supply first end 101 and first direct current power supply second end 102, the second direct current power supply includes: a second dc power source first end 201 and a second dc power source second end 202, where the first dc power source first end 101 and the first dc power source second end 102 are dc positive and negative power terminals of the first group of control loops, and are used to supply power to the first start loop 110 and the first outlet loop 120; the second dc power first terminal 201 and the second dc power second terminal 202 are dc positive and negative power terminals of the second group of control loops, and are used for supplying power to the second start loop 210 and the second outlet loop 220. Optionally, the first dc power supply and the second dc power supply are the same dc power supply, and the first dc power supply first end 101, the first dc power supply second end 102, the second dc power supply first end 201, and the second dc power supply second end 202 are different terminals of the same dc power supply.
A coil KT1-X of the first time relay connected by a dotted line and a normally open contact KT1-1 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 normally open contact KT1-1 of the first time relay is closed; a coil KT2-X of the second time relay connected by a dotted line and a normally open contact KT2-1 controlled by the coil are packaged in a whole to form the second time relay, and when the coil KT2-X of the second time relay is electrified and excited, the normally open contact KT2-1 of the second time relay is closed; a coil KM1-X of the first tripping relay connected by a dotted line, a first group of first tripping relay normally open contacts 122 controlled by the coil and a second group of first tripping relay normally open contacts 221 form the first tripping relay; the coil KM2-X of the second trip relay connected by a dashed line constitutes a second trip relay with the first set of second trip relay normally open contacts 222 and the second set of second trip relay normally open contacts 121 controlled by the coils.
The first starting loop 110 comprises a first contact combination 111, a first time relay coil KT1-X, a first time relay normally open contact KT1-1 and a first tripping relay coil KM 1-1; 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 time relay normally open contact KT1-1 is connected in series with the first trip relay coil KM1-X between the first terminal 101 and the second terminal 102 of the first dc power source.
Further, the first contact assembly 111 includes a first normally open auxiliary contact group CK1 and a first normally closed auxiliary contact group 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 communicated when the circuit breaker generates three-phase inconsistent operation, so that the first time relay is connected to the circuit; the first time relay is used for starting timing when the first starting loop 110 is electrified, and closing a normally open contact KT1-1 of the first time relay after the timing reaches the setting time.
The first outlet loop 120 includes a first set of first trip relay normally open contacts 122 and a second set of second trip relay normally open contacts 121; the first end of the second set of second tripping relay normally-open contacts 121 is electrically connected with the second end of the first contact combination 111, the normally-open contacts in the second set of second tripping relay normally-open contacts 121 and the normally-open contacts in the first set of first tripping relay normally-open contacts 122 are correspondingly connected in series between the second end of the first contact combination 111 and the output end of the first outlet loop 120 in a one-to-one manner, and signals output by the output end of the first outlet loop 120 are used for controlling the opening and closing state of the circuit breaker;
wherein the first end of the first outlet loop 120 is designated CZ 1.
The second starting loop 210 comprises a second contact combination 211, a second time relay coil KT2-X, a second time relay normally-open contact KT2-1 and a second tripping relay coil KM 2-X; a first end of the second contact combination 211 is electrically connected with a first end 201 of a 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; a second time relay normally-open contact KT2-1 and a second tripping relay coil KM2-X are connected between the first end 201 and the second end 202 of the second direct-current power supply in series;
further, the second contact group 211 comprises a second normally open auxiliary contact group CK2 and a second normally closed auxiliary contact group CB2 which are 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 being connected when the breaker generates three-phase inconsistent operation, so that the second time relay is connected to the circuit; the second time relay is used for starting timing when the second starting loop 220 is electrified, and closing a normally open contact KT2-1 of the second time relay after the timing reaches the setting time.
The second outlet loop 220 includes a second set of first trip relay normally open contacts 221 and a first set of second trip relay normally open contacts 222; the first end of the second group of first tripping relay normally-open contacts 221 is electrically connected with the second end of the second contact combination 211, the normally-open contacts in the second group of first tripping relay normally-open contacts 221 and the normally-open contacts in the first group of second tripping relay normally-open contacts 222 are connected in series between the second end of the second contact combination 211 and the output end of the second outlet loop 220 in a one-to-one correspondence mode, and signals output by the output end of the second outlet loop 220 are used for controlling the opening and closing state of the circuit breaker.
Wherein the first end of the second outlet loop 220 is designated CZ 2.
Further, the circuit breaker is a three-phase circuit breaker;
the first normally-open auxiliary contact group CK1 comprises an A-phase first normally-open auxiliary contact CK1-A, B phase first normally-open auxiliary contact CK1-B and a C-phase first normally-open auxiliary contact CK1-C which are connected in parallel; the first normally-closed auxiliary contact group CB1 comprises an A-phase first normally-closed auxiliary contact CB1-A, B phase first normally-closed auxiliary contact CB1-B and a C-phase first normally-closed auxiliary contact CB1-C which are connected in parallel;
the second normally-open auxiliary contact group CK2 comprises an A-phase second normally-open auxiliary contact CK2-A, B phase second normally-open auxiliary contact CK2-B and a C-phase second normally-open auxiliary contact CK2-C which are connected in parallel; the second normally-closed auxiliary contact group CB2 comprises an A-phase second normally-closed auxiliary contact CB2-A, B phase second normally-closed auxiliary contact CB2-B and a C-phase second normally-closed auxiliary contact CB2-C which are connected in parallel.
The auxiliary contact of the circuit breaker is mechanically connected with a switching-on and switching-off moving contact of the circuit breaker by adopting a metal connecting rod in a mechanism box of each phase of the circuit breaker and is used for reflecting the switching-on and switching-off 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.
Further, the circuit breaker is a three-phase circuit breaker;
the first group of first tripping relay normally-open contacts 122 comprise an A-phase first group of first tripping relay normally-open contacts KM1-1, a B-phase first group of first tripping relay normally-open contacts KM1-2 and a C-phase first group of first tripping relay normally-open contacts KM 1-3; the second group of first tripping relay normally-open contacts 221 comprise an A-phase second group of first tripping relay normally-open contacts KM1-4, a B-phase second group of first tripping relay normally-open contacts KM1-5 and a C-phase second group of first tripping relay normally-open contacts KM 1-6;
the first group of second tripping relay normally-open contacts 222 comprise an A-phase first group of second tripping relay normally-open contacts KM2-1, a B-phase first group of second tripping relay normally-open contacts KM2-2 and a C-phase first group of second tripping relay normally-open contacts KM 2-3; the second group of second trip relay normally open contacts 121 comprise an A-phase second group of second trip relay normally open contacts KM2-4, a B-phase second group of second trip relay normally open contacts KM2-5 and a C-phase second group of second trip relay normally open contacts KM 2-6.
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 anti-misoperation loop of the circuit breaker body 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 combination 111 and two ends of the second contact combination 211 are in an open state, so that the first starting loop 110 and the second starting loop 210 are not conducted, and the first outlet loop 120 and the second outlet loop 220 are not conducted because the outlet loops are connected with the first end of the direct-current power supply after being combined by the contacts;
2. when the circuit breaker normally operates, namely three phases are full, normally open auxiliary contacts in a first normally open auxiliary contact group CK1 and a second normally open auxiliary contact group CK2 are closed, normally closed auxiliary contacts in a first normally closed auxiliary contact group CB1 and a second normally closed auxiliary contact group CB2 are opened, two ends of a first contact combination 111 and two ends of a second contact combination 211 are in an open state, so that a first starting loop 110 and a second starting loop 210 are not conducted, coils of a first tripping relay and a second tripping relay are not excited, normally open contacts KM1-1, KM1-2, KM1-3, KM1-4, KM1-5 and KM1-6 of the first tripping relay and normally open contacts KM2-1, KM2-2, KM2-3, KM2-4, KM2-5 and KM2-6 of the second tripping relay are in an open state, therefore, the first outlet circuit 120 and the second outlet circuit 220 are not conductive;
at this time, if a certain starting loop is conducted by mistake due to the fact that the auxiliary contact of the circuit breaker is conducted by mistake, the cable connection between the auxiliary contact and the relay is damaged in an insulation manner or the relay is internally short-circuited, for example, the first starting loop 120 is conducted by mistake, so that the coil KM1-X of the first tripping relay is energized, six pairs of normally open contacts KM1-1, KM1-2, KM1-3, KM1-4, KM1-5 and KM1-6 of the first tripping relay are closed, but the second starting loop 220 is not conducted normally, six pairs of normally open contacts KM2-1, KM2-2, KM2-3, KM2-4, KM2-5 and KM2-6 of the second tripping relay in the two outlet loops are not closed, and at this time, because the six pairs of normally open contacts of the first tripping relay and the second tripping relay in the two outlet loops are correspondingly connected in series one-, the circuit breaker can not be tripped by false operation;
at this time, if a certain outlet loop is conducted by mistake due to the misoperation of the trip relay or the mistaken touch of a worker, if the A-phase second group trip relay normally-open contact KM2-4 in the first outlet loop 120 and the A-phase first group trip relay normally-open contact KM1-1 are both closed, the first outlet loop 120 is not electrified due to the normal non-conduction of the first contact combination 111, and the breaker is not tripped due to the misoperation;
3. when the three phases of the circuit breaker are not operated in a consistent mode, namely one-phase separation and two-phase combination or one-phase separation and two-phase combination, such as the A-phase separation and the B-phase separation of the circuit breaker, the A-phase normally-open auxiliary contact CK1 and the A-phase normally-open auxiliary contact CK1-A and the CK2-A in the second normally-open auxiliary contact CK2 are disconnected, the A-phase normally-closed auxiliary contact CB1-A and the CB2-A in the first normally-closed auxiliary contact CB1 and the second normally-closed auxiliary contact CB2 are closed, both ends of the first contact assembly 111 and the second contact assembly 211 are conducted, the first time relay coil KT1-X and the second time relay coil KT2-X are electrified and excited, when the electrifying time reaches the setting time, the first time relay normally-open contact KT1-1 and the second time relay coil KT2-1 are controlled to be closed, so that the first trip relay coil KM1-X and the second trip relay coil KM2-X are electrified and excited, and controlling six pairs of normally open contacts KM1-1, KM1-2, KM1-3, KM1-4, KM1-5 and KM1-6 of a first tripping relay coil and six pairs of normally open contacts KM2-1, KM2-2, KM2-3, KM2-4, KM2-5 and KM2-6 of a second tripping relay coil to be closed, tripping off the three-phase breaker and finishing the inconsistent state of the three-phase breaker.
According to the technical scheme of the embodiment, two sets of starting loops are started through respective independent contact combinations, and meanwhile, two outlet loops are connected in series by normally open contact sets of two sets of tripping relays in a one-to-one correspondence mode, so that only when a breaker is really in a three-phase inconsistent state and the three phases need to be tripped, the two starting loops are both conducted, and the two outlet loops both act to trip the outlets; 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 embodiment can be directly transformed by adopting the standby cable core wire, does not need to newly add an auxiliary contact, does not need to newly add a relay, does not influence the wiring and the setting of other loops, and is simple, reliable and feasible.
Example two
In this embodiment, based on the above embodiment, a first monitoring circuit group and a second monitoring circuit group are added to the above embodiment, and fig. 2 is a circuit topology diagram of a three-phase inconsistent protection anti-misoperation circuit of a circuit breaker body according to a second embodiment of the present invention; fig. 3 is a circuit topology diagram of a circuit breaker body three-phase inconsistent protection anti-malfunction circuit monitoring circuit according to the second embodiment of the present invention. Referring to fig. 2 and 3, the same or corresponding terms as those of the above-described embodiment are explained, and the description of the embodiment is omitted.
The circuit breaker body three-phase inconsistent protection misoperation prevention loop further comprises a first monitoring loop group and a second monitoring loop group; the system comprises a first on-position monitoring relay group, a second on-position monitoring relay group, a first normally open contact group, a second normally open contact group, a first trip coil group and a second trip coil group; the first on-position monitoring relay group comprises a first on-position monitoring relay coil group, a first on-position monitoring relay normally-open contact group, a first connecting plate group and a first on-position monitoring relay normally-closed contact group; the second on-position monitoring relay group comprises a second on-position monitoring relay coil group, a second on-position monitoring relay normally-open contact group, a second connecting piece group and a second on-position monitoring relay normally-closed contact group;
the first monitoring loop group includes: the system comprises a first on-position monitoring relay coil group, a first on-position monitoring relay normally-open contact group, a first connecting plate group, a first on-position monitoring relay normally-closed contact group, a first normally-open contact group and a first tripping coil group; the first end of a first on-position monitoring relay coil group is electrically connected with the first end 101 of a first direct-current power supply, the second end of a coil in the first on-position monitoring relay coil group is electrically connected with the first end of a normally open contact in the first normally open contact group in a one-to-one correspondence mode, a normally open contact in the first on-position monitoring relay normally open contact group is connected with a first connecting piece in the first connecting piece group in series in a one-to-one correspondence mode and then connected to two ends of the coil in the first on-position monitoring relay coil group in parallel, the second end of the normally open contact in the first on-position monitoring relay group is electrically connected with the first end of a tripping coil in the first tripping coil group in a one-to-one correspondence mode, the second end of the first tripping coil group is electrically connected with the second end 102 of the first direct-current power supply, and a normally closed contact of the first on-position monitoring relay normally closed contact group is connected with a normally open contact in the second group of first tripping relay normally open contacts 221 in parallel in a one-to-one correspondence mode;
the opening and closing state of the normally open contact in the first normally open contact group is always consistent with the actual opening and closing state of the circuit breaker, namely the normally open contact is closed when the circuit breaker operates normally.
Further, the output end of the first outlet loop 120 is electrically connected to the first ends of the normally open contacts in the first normally open contact group in a one-to-one correspondence manner, so that the output end of the first outlet loop 120 is connected to the second end 102 of the first dc power supply after passing through the first normally open contact group and the first trip coil group.
Specifically, first normally open contact group for when the circuit breaker tripping operation success back of inconsistent operation of three-phase, normally open contact in the first normally open contact group all breaks off, avoids burning out first tripping coil group.
The second monitoring loop group includes: the second on-position monitoring relay coil group, the second on-position monitoring relay normally-open contact group, the second connecting piece group, the second on-position monitoring relay normally-closed contact group, the second normally-open contact group and the second tripping coil group; the first end of the second combined position monitoring relay coil group is electrically connected with the first end 201 of the second direct-current power supply, the second end of the coil in the second combined position monitoring relay coil group is electrically connected with the first end of the normally open contact in the second normally open contact group in a one-to-one correspondence mode, the normally open contact in the second combined position monitoring relay normally open contact group is electrically connected with the two ends of the coil in the second combined position monitoring relay coil group in parallel after being connected in series in a one-to-one correspondence mode with the second connecting piece in the second connecting piece group, the second end of the normally open contact in the second normally open contact group is electrically connected with the first end of the tripping coil in the second tripping coil group in a one-to-one correspondence mode, the second end of the second tripping coil group is electrically connected with the second end 202 of the second direct-current power supply, and the normally closed contact of the second combined position monitoring relay normally closed contact group is electrically connected with the normally open contact in parallel in a one-to-one correspondence mode in the second tripping relay normally open contact 121.
The opening and closing state of the normally open contact in the second normally open contact group is always consistent with the actual opening and closing state of the circuit breaker, namely the normally open contact is closed when the circuit breaker operates normally.
Further, the output end of the second outlet loop 220 is electrically connected to the first ends of the normally open contacts in the second normally open contact set in a one-to-one correspondence manner, so that the output end of the second outlet loop 220 is connected to the second end 202 of the second dc power supply after passing through the second normally open contact set and the second trip coil set.
Specifically, the second normally open contact group for when the circuit breaker tripping operation success back of inconsistent operation of three-phase, normally open contact in the second normally open contact group all breaks off, avoids burning out second trip coil group.
Further, the first normally open contact group comprises a phase a first normally open contact CKA1, a phase B first normally open contact and a phase C first normally open contact; the second normally-open contact group comprises an A-phase second normally-open contact CKA2, a B-phase second normally-open contact and a C-phase second normally-open contact; the first tripping coil group comprises an A-phase first tripping coil TQA1, a B-phase first tripping coil and a C-phase first tripping coil; the second trip coil group comprises an A-phase second trip coil TQA2, a B-phase second trip coil and a C-phase second trip coil.
Further, the first on-position monitoring relay coil group comprises a phase A first on-position monitoring relay coil HWJA1-X, B phase first on-position monitoring relay coil and a phase C first on-position monitoring relay coil; the normally open contact group of the first on-position monitoring relay comprises a normally open contact HWJA1-1 of the A-phase first on-position monitoring relay, a normally open contact of the B-phase first on-position monitoring relay and a normally open contact of the C-phase first on-position monitoring relay; the first connecting piece group comprises a phase A first connecting piece LPA1, a phase B first connecting piece and a phase C first connecting piece; the first on-position monitoring relay normally-closed contact group comprises an A-phase first on-position monitoring relay normally-closed contact HWJA1-2, a B-phase first on-position monitoring relay normally-closed contact HWJB1-2 and a C-phase first on-position monitoring relay normally-closed contact HWJC 1-2;
the second on-position monitoring relay coil group comprises an A-phase second on-position monitoring relay coil HWJA2-X, B phase second on-position monitoring relay coil and a C-phase second on-position monitoring relay coil; the normally open contact group of the second on-position monitoring relay comprises a normally open contact HWJA2-1 of the A-phase second on-position monitoring relay, a normally open contact of the B-phase second on-position monitoring relay and a normally open contact of the C-phase second on-position monitoring relay; the second connecting piece group comprises a phase A second connecting piece LPA2, a phase B second connecting piece and a phase C second connecting piece; the second on-position monitoring relay normally-closed contact group comprises an A-phase second on-position monitoring relay normally-closed contact HWJA2-2, a B-phase second on-position monitoring relay normally-closed contact HWJB2-2 and a C-phase second on-position monitoring relay normally-closed contact HWJC 2-2.
Further, the first monitoring loop group includes a phase a first monitoring loop, a phase B first monitoring loop, and a phase C first monitoring loop;
the A-phase first monitoring circuit comprises an A-phase first on-position monitoring relay coil HWJA1-X, A phase first on-position monitoring relay normally-open contact HWJA1-1, an A-phase first connecting plate LPA1, an A-phase first on-position monitoring relay normally-open contact HWJA1-2, an A-phase first normally-open contact CKA1 and an A-phase first tripping coil TQA 1;
the B-phase first monitoring loop comprises a B-phase first on-position monitoring relay coil, a B-phase first on-position monitoring relay normally-open contact, a B-phase first connecting piece, a B-phase first on-position monitoring relay normally-open contact HWJB1-2, a B-phase first normally-open contact and a B-phase first tripping coil;
the C-phase first monitoring loop comprises a C-phase first on-position monitoring relay coil, a C-phase first on-position monitoring relay normally-open contact, a C-phase first connecting piece, a C-phase first on-position monitoring relay normally-closed contact HWJC1-2, a C-phase first normally-open contact and a C-phase first tripping coil;
the second monitoring loop group comprises an A-phase second monitoring loop, a B-phase second monitoring loop and a C-phase second monitoring loop;
the A-phase second monitoring circuit comprises an A-phase second on-position monitoring relay coil HWJA2-X, A phase second on-position monitoring relay normally-open contact HWJA2-1, an A-phase second connecting piece LPA2, an A-phase second on-position monitoring relay normally-open contact HWJA2-2, an A-phase second normally-open contact CKA2 and an A-phase second tripping coil TQA 2;
the B-phase second monitoring loop comprises a B-phase second on-position monitoring relay coil, a B-phase second on-position monitoring relay normally-open contact, a B-phase second connecting piece, a B-phase second on-position monitoring relay normally-open contact HWJB2-2, a B-phase second normally-open contact and a B-phase second tripping coil;
the C-phase second monitoring loop comprises a C-phase second on-position monitoring relay coil, a C-phase second on-position monitoring relay normally-open contact, a C-phase second connecting piece, a C-phase second on-position monitoring relay normally-closed contact HWJC2-2, a C-phase second normally-open contact and a C-phase second tripping coil.
As shown in fig. 3, the connection of the parts of the monitoring circuit and the outlet circuit is explained taking a phase a circuit as an example, wherein for a phase a first monitoring circuit: the first end of the A-phase first on-position monitoring relay coil HWJA1-X is electrically connected with the first end 101 of the first direct-current power supply, and the A-phase first on-position monitoring relay normally-open contact HWJA1-1 is connected with the A-phase first connecting piece LPA1 in series and then connected with the two ends of the A-phase first on-position monitoring relay coil HWJA1-X in parallel; the second end of the A-phase first on-position monitoring relay coil HWJA1-X is electrically connected with the first end of the A-phase first normally open contact CKA 1; the second end of the A-phase first normally open contact CKA1 is electrically connected with the first end of the A-phase first trip coil TQA1, and the second end of the A-phase first trip coil TQA1 is electrically connected with the second end 102 of the first direct current power supply; the A-phase first on-position monitoring relay normally-closed contact HWJA1-2 is connected in parallel to the two ends of the A-phase second group first tripping relay normally-open contact KM 1-4.
For phase a second monitoring loop: the first end of the A-phase second on-position monitoring relay coil HWJA2-X is electrically connected with the first end 201 of the second direct-current power supply, and the normally open contact HWJA2-1 of the A-phase second on-position monitoring relay is connected with the A-phase second connecting piece LPA2 in series and then connected with the two ends of the A-phase second on-position monitoring relay coil HWJA2-X in parallel; the second end of the A-phase second on-position monitoring relay coil HWJA2-X is electrically connected with the first end of the A-phase second normally open contact CKA 2; a second end of the A-phase second normally-open contact CKA2 is electrically connected with a first end of the A-phase second trip coil TQA2, and a second end of the A-phase second trip coil TQA2 is connected with a second end of the second direct-current power supply 202; the A-phase second on-position monitoring relay normally-closed contact HWJA2-2 is connected in parallel to the two ends of the A-phase second group second tripping relay normally-open contact KM 2-4.
The output terminal of the first outlet circuit 120 is electrically connected to the first terminal of the a-phase first normally open contact CKA1, and the output terminal of the second outlet circuit 220 is electrically connected to the first terminal of the a-phase second normally open contact CKA 2.
The working principle of the monitoring circuit in the three-phase inconsistent protection anti-misoperation circuit of the circuit breaker body is as follows:
1. when the three phases of the circuit breaker are fully shared, normally open contacts in the first normally open contact group and the second normally open contact group are both disconnected, the first on-position monitoring relay coil group and the second on-position monitoring relay coil group are not electrified, and the first monitoring loop group and the second monitoring loop group are not conducted;
2. when the circuit breaker normally operates, namely when three phases are full, normally open contacts in a first normally open contact group and a second normally open contact group are both closed, a first combined position monitoring relay coil group and a second combined position monitoring relay coil group are electrically excited to control the normally closed contact group of the first combined position monitoring relay and the normally closed contact group of the second combined position monitoring relay to be disconnected, the normally open contact group of the first combined position monitoring relay and the normally open contact group of the second combined position monitoring relay are closed, correspondingly, a first connecting piece group and a second connecting piece group are closed, and a first monitoring circuit group and a second monitoring circuit group are conducted and used for monitoring the normal state of each set of tripping coil and the direct-current power supply;
at this time, if a certain tripping coil is disconnected, for example, the a-phase first tripping coil TQA1 is disconnected, the closing monitoring relay coil HWJA1-X in the monitoring loop corresponding to the tripping coil loses power, the a-phase first closing monitoring relay normally open contact HWJA1-1 is controlled to be opened, the a-phase first closing monitoring relay normally closed contact HWJA1-2 is closed, the a-phase first closing monitoring relay normally closed contact hw 1-2 is closed, then the a-phase second group of first tripping relay normally open contacts KM1-4 are short-circuited, at this time, as long as the second loop normally works, if the breaker has three-phase inconsistent operation, the breaker can still be tripped by outlet motion;
at this time, if a certain end of the dc power supply of a certain loop loses power, for example, the first end 101 of the first dc power supply loses power, the first on-position monitoring relay coil set in the first monitoring loop set loses power, and controls the first on-position monitoring relay normally open contact set to open, the first on-position monitoring relay normally closed contact set is closed, and the second set of first trip relay normally open contact 221 is shorted, at this time, as long as the second loop works normally, if the breaker runs in three phases inconsistently, the second outlet loop 220 can still act to trip the breaker;
3. when the three phases of the circuit breakers are not operated in a consistent mode, the coils of the first monitoring circuit and the second monitoring circuit which correspond to one or two phases of the circuit breaker are closed to monitor the power failure, the normally closed contacts of the corresponding closed monitoring relay are closed, the short circuits are connected in parallel with the normally open contacts of the tripping relay at the two ends of the closed monitoring relay, the normal action of the two outlet loops is not influenced, and the tripping of the circuit breaker is not influenced.
According to the technical scheme of the embodiment, two sets of starting loops are started through respective independent contact combinations, meanwhile, two outlet loops are connected in series by normally open contact groups of two tripping relays in a one-to-one correspondence mode, and the outlet loops are connected with the first end of the direct-current power supply through the contact combinations, so that the outlet misoperation is effectively prevented; the monitoring circuits are added, the normally closed contacts of the normally closed contact group of the on-position monitoring relay and the normally open contacts of the normally open contact group of the tripping relay are connected in parallel in a one-to-one correspondence mode, so that good independence is kept between the two sets of circuits, and the influence on the other set of circuits caused by the fault of any one set of circuits or the power loss of any direct-current power supply is avoided; on the basis of effectively preventing the misoperation of the protection circuit, the power grid can not be refused, the safe operation of the power grid is ensured, and the requirement of the system stability is met. In addition, the spare cable core wire is directly transformed, an auxiliary contact and a relay do not need to be newly added, the wiring and the arrangement of other loops are not influenced, and the method is simple, reliable and feasible.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a three-phase inconsistency protection misoperation prevention system for a circuit breaker body according to a third embodiment of the present invention. As shown in fig. 4, the three-phase inconsistent protection misoperation prevention system of the breaker body comprises: the three-phase inconsistency protection misoperation prevention circuit 310 of the breaker body provided by any embodiment of the invention further comprises a breaker 300 and an external device 320 which are connected with the three-phase inconsistency protection misoperation prevention circuit of the breaker body.
The third embodiment comprises the three-phase inconsistent protection misoperation prevention loop of the circuit breaker body provided by any embodiment of the invention, so that the technical principle and the generated effect are similar, and the description is omitted.
Note that fig. 4 is only a schematic structural diagram of the three-phase inconsistent protection and malfunction prevention system of the circuit breaker body, and is not a unique structure of the three-phase inconsistent protection and malfunction prevention system of the circuit breaker body.
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 (8)
1. A circuit breaker body three-phase inconsistent protection misoperation prevention loop is characterized by comprising a first starting loop, a second starting loop, a first outlet loop, a second outlet loop, a first direct current power supply and a second direct current power supply; the relay comprises a first contact combination, a second contact combination, a first time relay, a second time relay, a first tripping relay and a second tripping relay; the first time relay comprises a first time relay coil and a first time relay normally open contact; the first tripping relay comprises a first tripping relay coil, a first group of first tripping relay normally open contacts and a second group of first tripping relay normally open contacts; the second time relay comprises a second time relay coil and a second time relay normally open contact; the second tripping relay comprises a second tripping relay coil, a first group of second tripping relay normally open contacts and a second group of second tripping relay normally open contacts;
the first start loop comprises the first contact combination, the first time relay coil, the first time relay normally open contact and the first trip relay coil; 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; the first time relay normally-open contact and the first tripping relay coil are connected between the first end and the second end of the first direct-current power supply in series;
the first outlet loop comprises the first set of first trip relay normally open contacts and the second set of second trip relay normally open contacts; the first ends of the normally open contacts of the second set of second tripping relays are electrically connected with the second end of the first contact combination, the normally open contacts of the second set of second tripping relay normally open contacts and the normally open contacts of the first set of first tripping relay normally open contacts are correspondingly connected in series between the second end of the first contact combination and the output end of the first outlet loop in a one-to-one mode, and signals output by the output end of the first outlet loop are used for controlling the opening and closing state of the circuit breaker;
the second start loop comprises the second contact combination, the second time relay coil, the second time relay normally open contact and the second trip relay coil; 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; the second time relay normally-open contact and the second tripping relay coil are connected between the first end and the second end of the second direct-current power supply in series;
the second outlet loop comprises the second set of first trip relay normally open contacts and the first set of second trip relay normally open contacts; the first ends of the normally open contacts of the second group of first tripping relays are electrically connected with the second end of the second contact combination, the normally open contacts of the second group of first tripping relays and the normally open contacts of the first group of second tripping relays are correspondingly connected in series between the second end of the second contact combination and the output end of the second outlet loop in a one-to-one mode, and signals output by the output end of the second outlet loop are used for controlling the opening and closing state of the circuit breaker;
the circuit breaker body three-phase inconsistent protection anti-misoperation loop is characterized in that 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;
the circuit breaker is a three-phase circuit breaker; the first normally-open auxiliary contact group comprises an A-phase first normally-open auxiliary contact, a B-phase first normally-open auxiliary contact and a C-phase first normally-open auxiliary contact which are connected in parallel; the first normally closed auxiliary contact group comprises an A-phase first normally closed auxiliary contact, a B-phase first normally closed auxiliary contact and a C-phase first normally closed auxiliary contact which are connected in parallel;
the second normally-open auxiliary contact group comprises an A-phase second normally-open auxiliary contact, a B-phase second normally-open auxiliary contact and a C-phase second normally-open auxiliary contact which are connected in parallel; the second normally closed auxiliary contact group comprises an A-phase second normally closed auxiliary contact, a B-phase second normally closed auxiliary contact and a C-phase second normally closed auxiliary contact which are connected in parallel.
2. The circuit breaker body three-phase inconsistent protection false-action prevention circuit of claim 1, further comprising a first monitoring circuit group and a second monitoring circuit group; the system comprises a first on-position monitoring relay group, a second on-position monitoring relay group, a first normally open contact group, a second normally open contact group, a first trip coil group and a second trip coil group; the first on-position monitoring relay group comprises a first on-position monitoring relay coil group, a first on-position monitoring relay normally-open contact group, a first connecting plate group and a first on-position monitoring relay normally-closed contact group; the second on-position monitoring relay group comprises a second on-position monitoring relay coil group, a second on-position monitoring relay normally-open contact group, a second connecting piece group and a second on-position monitoring relay normally-closed contact group;
the first monitoring loop group includes: the first on-position monitoring relay coil group, the first on-position monitoring relay normally-open contact group, the first connecting plate group, the first on-position monitoring relay normally-closed contact group, the first normally-open contact group and the first tripping coil group; a first end of the first on-position monitoring relay coil assembly is electrically connected with a first end of the first direct current power supply, the second ends of the coils in the first on-position monitoring relay coil group are electrically connected with the first ends of the normally open contacts in the first normally open contact group in a one-to-one correspondence mode, the normally open contacts in the normally open contact group of the first on-off monitoring relay are connected in series with the first connecting pieces in the first connecting piece group in a one-to-one correspondence manner and then are connected in parallel with two ends of the coil in the coil group of the first on-off monitoring relay, the second ends of the normally open contacts in the first normally open contact group are electrically connected with the first ends of the tripping coils in the first tripping coil group in a one-to-one correspondence mode, 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 normally closed contacts of the first on-position monitoring relay normally closed contact group are connected with the normally open contacts of the second group of first tripping relay normally open contacts in a one-to-one corresponding and parallel mode;
the second monitoring loop group includes: the second on-position monitoring relay coil group, the second on-position monitoring relay normally-open contact group, the second connecting piece group, the second on-position monitoring relay normally-closed contact group, the second normally-open contact group and the second tripping coil group; the first end of the second on-position monitoring relay coil set is electrically connected with the first end of the second direct-current power supply, the second ends of the coils in the second on-position monitoring relay coil group are electrically connected with the first ends of the normally open contacts in the second normally open contact group in a one-to-one correspondence mode, the normally open contacts in the normally open contact group of the second on-position monitoring relay are correspondingly connected in series with the second connecting pieces in the second connecting piece group one by one and then are connected in parallel with the two ends of the coil in the coil group of the second on-position monitoring relay, the second ends of the normally open contacts in the second normally open contact group are electrically connected with the first ends of the tripping coils in the second tripping coil group in a one-to-one correspondence mode, 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 normally closed contacts of the second closing monitoring relay normally closed contact group are in one-to-one corresponding parallel connection with the normally open contacts of the second tripping relay normally open contacts of the second group.
3. The circuit breaker body three-phase inconsistent protection false-action prevention circuit of claim 2, wherein the circuit breaker is a three-phase circuit breaker;
the first normally-open contact group comprises an A-phase first normally-open contact, a B-phase first normally-open contact and a C-phase first normally-open contact; the second normally-open contact group comprises an A-phase second normally-open contact, a B-phase second normally-open contact and a C-phase second normally-open contact; the first tripping coil group comprises an A-phase first tripping coil, a B-phase first tripping coil and a C-phase first tripping 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.
4. The circuit breaker body three-phase inconsistent protection false-action preventing circuit of claim 2, wherein the first on-position monitoring relay coil group comprises an A-phase first on-position monitoring relay coil, a B-phase first on-position monitoring relay coil and a C-phase first on-position monitoring relay coil; the normally open contact group of the first on-position monitoring relay comprises a normally open contact of an A-phase first on-position monitoring relay, a normally open contact of a B-phase first on-position monitoring relay and a normally open contact of a C-phase first on-position monitoring relay; the first connecting piece group comprises a phase A first connecting piece, a phase B first connecting piece and a phase C first connecting piece; the first on-position monitoring relay normally-closed contact group comprises an A-phase first on-position monitoring relay normally-closed contact, a B-phase first on-position monitoring relay normally-closed contact and a C-phase first on-position monitoring relay normally-closed contact;
the second on-position monitoring relay coil group comprises an A-phase second on-position monitoring relay coil, a B-phase second on-position monitoring relay coil and a C-phase second on-position monitoring relay coil; the normally open contact group of the second on-position monitoring relay comprises a normally open contact of an A-phase second on-position monitoring relay, a normally open contact of a B-phase second on-position monitoring relay and a normally open contact of a C-phase second on-position monitoring relay; the second connecting piece group comprises a phase A second connecting piece, a phase B second connecting piece and a phase C second connecting piece; the second closed monitoring relay normally-closed contact group comprises an A-phase second closed monitoring relay normally-closed contact, a B-phase second closed monitoring relay normally-closed contact and a C-phase second closed monitoring relay normally-closed contact.
5. The circuit breaker body three-phase inconsistent protection false-action prevention circuit of claim 2, wherein the first monitoring circuit group comprises an A-phase first monitoring circuit, a B-phase first monitoring circuit and a C-phase first monitoring circuit;
the A-phase first monitoring loop comprises an A-phase first on-position monitoring relay coil, an A-phase first on-position monitoring relay normally-open contact, an A-phase first connecting piece, an A-phase first on-position monitoring relay normally-closed contact, an A-phase first normally-open contact and an A-phase first tripping coil;
the B-phase first monitoring loop comprises a B-phase first on-position monitoring relay coil, a B-phase first on-position monitoring relay normally-open contact, a B-phase first connecting piece, a B-phase first on-position monitoring relay normally-closed contact, a B-phase first normally-open contact and a B-phase first tripping coil;
the C-phase first monitoring loop comprises a C-phase first on-position monitoring relay coil, a C-phase first on-position monitoring relay normally-open contact, a C-phase first connecting piece, a C-phase first on-position monitoring relay normally-closed contact, a C-phase first normally-open contact and a C-phase first tripping coil;
the second monitoring loop group comprises an A-phase second monitoring loop, a B-phase second monitoring loop and a C-phase second monitoring loop;
the A-phase second monitoring loop comprises an A-phase second on-position monitoring relay coil, an A-phase second on-position monitoring relay normally-open contact, an A-phase second connecting piece, an A-phase second on-position monitoring relay normally-open contact, an A-phase second normally-open contact and an A-phase second tripping coil;
the B-phase second monitoring loop comprises a B-phase second on-position monitoring relay coil, a B-phase second on-position monitoring relay normally-open contact, a B-phase second connecting piece, a B-phase second on-position monitoring relay normally-open contact, a B-phase second normally-open contact and a B-phase second tripping coil;
the C-phase second monitoring loop comprises a C-phase second on-position monitoring relay coil, a C-phase second on-position monitoring relay normally-open contact, a C-phase second connecting piece, a C-phase second on-position monitoring relay normally-closed contact, a C-phase second normally-open contact and a C-phase second tripping coil.
6. The circuit breaker body three-phase inconsistency protection false-operation prevention circuit according to claim 1, wherein the output end of the first outlet circuit is electrically connected with the first ends of the normally open contacts in the first normally open contact group in a one-to-one correspondence manner; and the output end of the second outlet loop is electrically connected with the first ends of the normally open contacts in the second normally open contact group in a one-to-one correspondence manner.
7. The circuit breaker body three-phase inconsistent protection false-action prevention circuit of claim 1, wherein the circuit breaker is a three-phase circuit breaker;
the first group of first tripping relay normally-open contacts comprise A-phase first group of first tripping relay normally-open contacts, B-phase first group of first tripping relay normally-open contacts and C-phase first group of first tripping relay normally-open contacts; the second group of first tripping relay normally-open contacts comprise an A-phase second group of first tripping relay normally-open contacts, a B-phase second group of first tripping relay normally-open contacts and a C-phase second group of first tripping relay normally-open contacts;
the first group of second tripping relay normally-open contacts comprise A-phase first group of second tripping relay normally-open contacts, B-phase first group of second tripping relay normally-open contacts and C-phase first group of second tripping relay normally-open contacts; the second group of second tripping relay normally-open contacts comprise an A-phase second group of second tripping relay normally-open contacts, a B-phase second group of second tripping relay normally-open contacts and a C-phase second group of second tripping relay normally-open contacts.
8. A breaker body three-phase inconsistency protection misoperation prevention system is characterized by comprising the breaker body three-phase inconsistency protection misoperation prevention circuit according to any one of claims 1 to 7, and further comprising a breaker and external equipment connected with the breaker body three-phase inconsistency protection misoperation prevention circuit.
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| CN209375133U (en) * | 2018-12-26 | 2019-09-10 | 广东电网有限责任公司 | Breaker protective loop |
| CN110086183A (en) * | 2019-05-31 | 2019-08-02 | 广东电网有限责任公司 | A kind of breaker body unbalanced three-phase lines protection circuit |
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