CN215934443U - Three-phase inconsistent protection circuit of circuit breaker - Google Patents
Three-phase inconsistent protection circuit of circuit breaker Download PDFInfo
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- CN215934443U CN215934443U CN202121712725.5U CN202121712725U CN215934443U CN 215934443 U CN215934443 U CN 215934443U CN 202121712725 U CN202121712725 U CN 202121712725U CN 215934443 U CN215934443 U CN 215934443U
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Abstract
The utility model provides a three-phase inconsistent protection circuit of a breaker, which is used for three-phase inconsistent protection of a ground tank type breaker, and the three-phase inconsistent protection circuit of a breaker body comprises: the device comprises a dynamic break contact parallel unit, a dynamic make contact parallel unit, a time relay and an intermediate relay; when the opening and closing states of three-phase switches of the floor tank type circuit breaker are inconsistent, the movable contact parallel unit and the movable contact parallel unit are conducted simultaneously, the power supply supplies power to the time relay coil, the time relay coil is conducted by the time delay movable contact after being powered by the power supply within a preset time, the power supply supplies power to the intermediate relay coil through the conducted time delay movable contact, the intermediate relay coil conducts three intermediate movable contacts after obtaining the power supply, and the power supply supplies power to the tripping coil through the conducted movable contact parallel unit and the intermediate movable contact so as to enable the floor tank type circuit breaker to trip. This embodiment can improve the inconsistent protection circuit's of circuit breaker three-phase reliability and stability.
Description
Technical Field
The utility model relates to the technical field of electric power, in particular to a three-phase inconsistent protection circuit of a circuit breaker.
Background
In order to improve the stability of the power system, a ground tank type circuit breaker of split-phase operation is often used, the ground tank type circuit breaker is a circuit breaker with an arc extinguish chamber in a grounding metal tank, and a three-phase inconsistent protection circuit of the circuit breaker is a protection circuit commonly used in the power system, and can prevent negative sequence components from occurring in the system due to the inconsistent three phases of the ground tank type circuit breaker, so that the stability of the power system is maintained.
In the actual life, electric power system is when moving, because fall to the ground tank circuit breaker often exposes in outdoor operation, and the environment is often relatively poor, consequently make the electric elements among its circuit breaker three-phase inconsistent circuit wet, be heated, impaired etc. because of unfavorable environmental factor easily, make circuit breaker three-phase inconsistent circuit malfunction easily, still easily because of personnel's maloperation relay test button, lead to its circuit breaker three-phase inconsistent circuit malfunction, further lead to falling to the ground tank circuit breaker tripping operation by mistake, cause danger easily. Therefore, there is a need to improve the structure of today's circuit breaker three-phase inconsistent protection circuits to improve their stability.
SUMMERY OF THE UTILITY MODEL
Embodiments of the present invention provide a three-phase inconsistent protection circuit for a circuit breaker, so as to at least partially solve the above problems.
The embodiment of the application provides a inconsistent protection circuit of circuit breaker three-phase for the inconsistent protection of three-phase that falls to the ground tank circuit breaker, it includes three trip coil to fall to the ground tank circuit breaker, trip coil includes current inflow end and current outflow end, the inconsistent protection circuit of circuit breaker three-phase includes:
the device comprises a dynamic break contact parallel unit, a dynamic make contact parallel unit, a time relay and an intermediate relay; the time relay comprises a time relay coil and a time delay dynamic closing contact, and the intermediate relay comprises an intermediate relay coil and three intermediate dynamic closing contacts; the movable breaking contact parallel unit comprises a first end, a second end and three auxiliary movable breaking contacts connected in parallel between the first end of the movable breaking contact parallel unit and the second end of the movable breaking contact parallel unit; the movable contact parallel unit comprises a first end, a second end and three auxiliary movable contacts connected in parallel between the first end of the movable contact parallel unit and the second end of the movable contact parallel unit;
the time relay coil comprises a current inflow end and a current outflow end, the time delay dynamic contact comprises a first end and a second end, the intermediate relay coil comprises a current inflow end and a current outflow end, and the intermediate dynamic contact comprises a first end and a second end;
the first end of the dynamic disconnection contact parallel unit is connected with the positive voltage output end of the power supply, the second end of the dynamic disconnection contact parallel unit is connected with the first end of the dynamic disconnection contact parallel unit, the second end of the dynamic disconnection contact parallel unit is connected with the first end of the time relay coil, and the second end of the time relay coil is connected with the negative voltage output end of the power supply; the first end of the delay dynamic closing contact is connected with the positive voltage output end of the power supply, the second end of the delay dynamic closing contact is connected with the first end of the intermediate relay coil, and the second end of the intermediate relay coil is connected with the negative voltage output end of the power supply; the first end of each middle dynamic contact in the three middle dynamic contacts is connected to an electric connecting line between the second end of the dynamic contact parallel unit and the first end of the dynamic contact parallel unit, the second end of each middle dynamic contact in the three middle dynamic contacts is connected with the current inflow end of one trip coil, and the current outflow end of each trip coil in the three trip coils is connected with the negative voltage output end of the power supply;
when the open-close states of the three-phase switch of the floor tank type circuit breaker are inconsistent, at least one auxiliary break contact in the three auxiliary break contacts is conducted, at least one auxiliary make contact in the three auxiliary make contacts is conducted, so that the break contact parallel unit and the make contact parallel unit are conducted simultaneously, the power supply supplies power to the time relay coil, the time relay coil is conducted after being powered by the power supply for a preset time, the power supply supplies power to the intermediate relay coil through the conducted time delay make contact, the intermediate relay coil conducts the three intermediate make contacts after being powered by the power supply, and the power supply supplies power to the trip coil through the conducted break contact parallel unit and the intermediate make contact, to trip the ground tank circuit breaker.
In an alternative embodiment, the three intermediate moving contact contacts include a first intermediate moving contact, a second intermediate moving contact and a third intermediate moving contact, and the three trip coils include a first trip coil, a second trip coil and a third trip coil; the first end of the first middle dynamic contact, the first end of the second middle dynamic contact and the first end of the third middle dynamic contact are connected and then connected to an electric connecting line between the second end of the dynamic break contact parallel unit and the first end of the dynamic break contact parallel unit; the second end of the first middle dynamic closing contact is connected with the current inflow end of the first tripping coil, and the current outflow end of the first tripping coil is connected with the negative voltage output end of the power supply; the second end of the second middle dynamic closing contact is connected with the current inflow end of the second tripping coil, and the current outflow end of the second tripping coil is connected with the negative voltage output end of the power supply; the second end of the third middle dynamic contact is connected with the current inflow end of the third tripping coil, and the current outflow end of the third tripping coil is connected with the negative voltage output end of the power supply; when the movable contact parallel unit is conducted, the power supply supplies power to the first tripping coil, the second tripping coil and the third tripping coil through the conducted movable contact parallel unit so as to enable the ground tank type circuit breaker to trip.
In an alternative embodiment, the intermediate relay further comprises a fourth intermediate moving contact comprising a first end and a second end; the first end of the fourth middle dynamic-combination contact is connected with the first end of the time-delay dynamic-combination contact, and the second end of the fourth middle dynamic-combination contact is connected with the second end of the time-delay dynamic-combination contact; and after the power supply supplies power to the intermediate relay coil through the switched-on delay dynamic closing contact, the intermediate relay coil obtains the power supply and then switches on the fourth intermediate dynamic closing contact, and after the delay dynamic closing contact is switched off, the state that the intermediate relay coil is powered by the power supply is maintained.
In an optional embodiment, the three-phase inconsistent protection circuit of the circuit breaker further comprises a reset button, wherein the reset button comprises a first end and a second end; the first end of the reset button is connected with the first end of the delay dynamic closing contact, the second end of the reset button is connected with the first end of the fourth middle dynamic closing contact, and the second end of the fourth middle dynamic closing contact is connected with the second end of the delay dynamic closing contact; when the reset button is pressed to be disconnected and the fourth middle movable contact is conducted, the three-phase inconsistent protection circuit of the circuit breaker is reset.
In an optional embodiment, the three-phase inconsistent protection circuit of the circuit breaker further comprises a first pressure plate, wherein the first pressure plate comprises a first end and a second end; the first end of the first pressing plate is connected with the current outflow end of the time relay coil, and the second end of the first pressing plate is connected with the negative voltage output end of the power supply; and after the first pressing plate is disconnected, the power supply disconnects the power supply of the time relay coil.
In an optional embodiment, the three-phase inconsistent protection circuit of the circuit breaker further comprises a second pressure plate, wherein the second pressure plate comprises a first end and a second end; the first end of the first middle dynamic contact, the first end of the second middle dynamic contact and the first end of the third middle dynamic contact are connected and then connected to the first end of the second pressing plate, and the second end of the second pressing plate is connected to an electric connecting line between the second end of the dynamic break contact parallel unit and the first end of the dynamic break contact parallel unit; and after the second pressing plate is disconnected, the power supply disconnects the power supply of the tripping coil.
In an optional embodiment, the three-phase inconsistent protection circuit of the circuit breaker further comprises: the switching-off relay comprises a switching-off relay coil and three switching-off moving contact terminals, the switching-off button comprises a first end and a second end, and the switching-off relay coil comprises a current inflow end and a current outflow end; the current inflow end of the opening relay coil is connected with the positive voltage output end of the power supply, the current outflow end of the opening relay coil is connected with the first end of the opening button, the second end of the opening button is connected with the negative voltage output end of the power supply, the first ends of the three opening and closing contacts are connected with the positive voltage output end of the power supply, and the second ends of the three opening and closing contacts are respectively connected with the current inflow ends of the three tripping coils; when the opening button is pressed down and conducted, the power supply supplies power to the opening relay coil, the opening relay coil obtains the power supply and then enables the three opening and closing contacts to be conducted, and the power supply supplies power to the tripping coil through the conducted three opening and closing contacts so that the floor tank type circuit breaker is opened.
In an alternative embodiment, at least one first current limiting resistor is connected in parallel across the intermediate relay coil.
In an alternative embodiment, at least one second current limiting resistor is connected in parallel across the trip coil.
In an optional embodiment, the intermediate relay further includes a case provided with a groove, and a test button provided on a bottom wall of the groove and having a height in a depth direction of the groove smaller than a height of a sidewall of the groove, the test button being used to trip the ground tank breaker after being turned on.
In the three-phase inconsistent protection circuit of the circuit breaker in the embodiment, the current inflow end of the trip coil is connected to the second end of the middle dynamic contact, the first end of the middle dynamic contact is connected to the electric connecting line between the second end of the dynamic contact parallel unit and the first end of the dynamic contact parallel unit, so that the trip coil can be powered by the power supply only when the dynamic contact parallel unit and the dynamic contact parallel unit are simultaneously conducted, and the three-phase inconsistent switching states of the ground tank type circuit breaker inevitably exist if the dynamic contact parallel unit and the dynamic contact parallel unit are simultaneously conducted, therefore, the three-phase inconsistent protection circuit of the circuit breaker in the embodiment of the application can ensure that the ground tank type circuit breaker trips only when the three-phase switching states of the ground tank type circuit breaker are inconsistent, and the ground tank type circuit breaker cannot malfunction under adverse environmental factors, therefore, the reliability and stability of the three-phase inconsistent circuit of the circuit breaker can be guaranteed.
Drawings
The drawings are only for purposes of illustrating and explaining the present application and are not to be construed as limiting the scope of the present application.
Fig. 1 shows a three-phase inconsistent protection circuit of a circuit breaker according to an embodiment of the application.
Reference numerals:
1. a dynamic break contact parallel unit; a1, auxiliary break contact; b1, auxiliary break contact; c1, auxiliary break contact; 2. a movable contact parallel unit; a2, auxiliary dynamic closing contact; b2, auxiliary dynamic closing contact; c2, auxiliary dynamic close contact; 3. a time relay coil; 4. a time-delay dynamic closing contact; 5. an intermediate relay coil; 61. a first intermediate moving contact; 62. a second intermediate moving contact; 63. a third intermediate moving contact; 64. a fourth intermediate moving contact; 71. a first trip coil; 72. a second trip coil; 73. a third trip coil; 8. a reset button; 91. a switching-off relay coil; 92. opening and closing the contact; 93. a brake separating button; 10. a first platen; 20. a second platen; r1, a first current limiting resistor; r2, a second current limiting resistor; r3, a third current limiting resistor.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application shall fall within the scope of the protection of the embodiments in the present application.
A ground tank circuit breaker, i.e. a circuit breaker in which an arc extinguishing chamber is located in a grounded metal tank, is a very common circuit breaker in an electric power system, and most of ground tank circuit breakers are high-voltage circuit breakers. The ground tank circuit breaker is often operated in phase separation, for example into A, B, C three phases. In order to ensure the operation safety of the ground tank type circuit breaker, a common ground tank type circuit breaker can be provided with three-phase inconsistent protection measures, the three-phase inconsistent state of the ground tank type circuit breaker mainly refers to the condition that the opening and closing states of three-phase switches of the ground tank type circuit breaker are inconsistent (for example, two-phase closing and one-phase opening) due to faults and the like when the ground tank type circuit breaker operates, under the condition, a negative sequence component can occur to a system due to the three-phase inconsistency of the ground tank type circuit breaker, and a three-phase inconsistent protection circuit of the circuit breaker is an important means for ensuring the safety of a power system. In the actual life, electric power system is when the operation, because fall to the ground tank circuit breaker often exposes in outdoor operation, and the environment is often relatively poor, consequently makes the electric elements in its circuit breaker three-phase nonconformity circuit wet, be heated, impaired etc. because of bad environmental factor easily, makes the inconsistent circuit malfunction of circuit breaker three-phase easily, further leads to falling to the ground tank circuit breaker tripping by mistake, causes danger easily.
The embodiment of the application provides a inconsistent protection circuit of circuit breaker three-phase for fall to the ground tank circuit breaker, its characterized in that, this inconsistent protection circuit of circuit breaker three-phase includes:
the fall to the ground tank circuit breaker includes three tripping coil, tripping coil includes current inflow end and current outflow end, the inconsistent protection circuit of circuit breaker three-phase includes:
the device comprises a dynamic break contact parallel unit 1, a dynamic make contact parallel unit 2, a time relay and an intermediate relay; the time relay comprises a time relay coil 3 and a time delay dynamic closing contact 4, and the intermediate relay comprises an intermediate relay coil 5 and three intermediate dynamic closing contacts; the movable break contact parallel unit 1 comprises a first end, a second end and three auxiliary movable break contacts connected in parallel between the first end of the movable break contact parallel unit 1 and the second end of the movable break contact parallel unit 1; the movable contact parallel unit 2 comprises a first end and a second end, and three auxiliary movable contacts connected in parallel between the first end of the movable contact parallel unit 2 and the second end of the movable contact parallel unit 2;
the time relay coil 3 comprises a current inflow end and a current outflow end, the time delay dynamic contact 4 comprises a first end and a second end, the intermediate relay coil 5 comprises a current inflow end and a current outflow end, and the intermediate dynamic contact comprises a first end and a second end;
the first end of the dynamic break contact parallel unit 1 is connected with the positive voltage output end of a power supply, the second end of the dynamic break contact parallel unit 1 is connected with the first end of the dynamic make contact parallel unit 2, the second end of the dynamic make contact parallel unit 2 is connected with the first end of the time relay coil 3, and the second end of the time relay coil 3 is connected with the negative voltage output end of the power supply; the first end of the delay dynamic closing contact 4 is connected with the positive voltage output end of the power supply, the second end of the delay dynamic closing contact 4 is connected with the first end of the intermediate relay coil 5, and the second end of the intermediate relay coil 5 is connected with the negative voltage output end of the power supply; the first end of each middle dynamic contact in the three middle dynamic contacts is connected to an electric connecting line between the second end of the dynamic contact parallel unit 1 and the first end of the dynamic contact parallel unit 2, the second end of each middle dynamic contact in the three middle dynamic contacts is connected with the current inflow end of one trip coil, and the current outflow end of each trip coil in the three trip coils is connected with the negative voltage output end of the power supply;
when the open-close states of the three-phase switch of the floor tank breaker are inconsistent, at least one auxiliary break contact of the three auxiliary break contacts is conducted, at least one auxiliary make contact of the three auxiliary make contacts is conducted, so that the break contact parallel unit 1 and the make contact parallel unit 2 are conducted simultaneously, the power supply supplies power to the time relay coil 3, the time relay coil 3 is conducted after being powered by the power supply for a preset time, the time delay make contact 4 is conducted, the power supply supplies power to the intermediate relay coil 5 through the conducted time delay make contact 4, the intermediate relay coil 5 conducts the three intermediate make contacts after being powered by the power supply, and the power supply supplies power to the trip coil through the conducted break contact parallel unit 1 and the intermediate make contact, to trip the ground tank circuit breaker.
In the three-phase inconsistent protection circuit of the circuit breaker in the embodiment, the current inflow end of the trip coil is connected to the second end of the middle dynamic contact, the first end of the middle dynamic contact is connected to the electric connection line between the second end of the dynamic contact parallel unit 1 and the first end of the dynamic contact parallel unit 2, so that the trip coil can be powered only when the dynamic contact parallel unit 1 and the dynamic contact parallel unit 2 are simultaneously conducted, and the three-phase switch open-close states of the floor tank circuit breaker are inevitably inconsistent if the dynamic contact parallel unit 1 and the dynamic contact parallel unit 2 are simultaneously conducted, therefore, the three-phase inconsistent protection circuit of the circuit breaker in the embodiment of the application can circuit breaker can ensure that the floor tank circuit breaker trips only when the three-phase switch open-close states of the floor tank circuit breaker are inconsistent, and false operation can not be caused by adverse environmental factors, therefore, the reliability and stability of the three-phase inconsistent circuit of the circuit breaker can be guaranteed.
The three-phase inconsistent protection circuit of the circuit breaker in the embodiment can be preferably used for a floor tank type circuit breaker of 220KV and above.
Specifically, in the three-phase inconsistent protection circuit of the circuit breaker in the embodiment, the movable contact parallel unit 1 includes three auxiliary movable contacts connected in parallel, and the movable contact parallel unit 2 includes three auxiliary movable contacts connected in parallel. In this embodiment, the auxiliary moving-on contact is a moving-on contact of an auxiliary switch corresponding to a three-phase switch of the ground tank type circuit breaker, and the auxiliary moving-off contact is a moving-off contact of an auxiliary switch corresponding to a three-phase switch of the circuit breaker. When a three-phase switch of the ground tank type circuit breaker is not closed, the auxiliary dynamic closing contact is in an open state, the auxiliary dynamic breaking contact is in a closed state, and after the three-phase switch is closed, the auxiliary dynamic closing contact is closed, and the auxiliary dynamic breaking contact is broken. It is understood that closed, i.e. conducting.
In the circuit, for a relay, a dynamic open contact refers to a contact which is in a closed state when a relay coil is not electrified and is opened after the relay coil is electrified, and a dynamic close contact refers to a contact which is in an open state when the relay coil is not electrified and is closed and then conducted after the relay coil is electrified.
When the three-phase switches of the ground tank type circuit breaker are in inconsistent opening and closing states, at least one of the three auxiliary dynamic-breaking contacts cannot be disconnected, and at least one of the three auxiliary dynamic-closing contacts is closed, so that the dynamic-breaking contact parallel unit 1 and the dynamic-closing contact parallel unit 2 are simultaneously conducted. The positive voltage output end of the power supply can be connected with the current inflow end of the time relay coil 3 through the break contact parallel unit 1 and the make contact parallel unit 2 which are conducted simultaneously, and the current outflow end of the time relay coil 3 is connected with the negative voltage output end of the power supply, so that the power supply supplies power for the time relay coil 3, the time relay coil 3 is electrified, and the time delay make contact 4 is further conducted after the time delay preset time.
In this embodiment, the time relay coil 3 and the delay moving contact 4 are a coil and a delay moving contact in the same time relay, respectively. The time relay comprises a time relay coil 3 and a time delay movable contact 4, and obviously, due to the electrical characteristics of the time relay, after the time relay coil 3 is powered by a power supply, the time delay movable contact 4 can be closed after preset time, so that the time delay movable contact is conducted.
On this basis, the time relay coil 3 may delay the preset time after the power is turned on (the preset time may be set by a user for the time relay, for example, two seconds), so that the delay snap contact 4 is turned on, the first end of the delay snap contact 4 is connected to the positive voltage output end of the power supply, the second end of the delay snap contact 4 is connected to the current inflow end of the intermediate relay coil 5, and the current outflow end of the intermediate relay coil 5 is connected to the negative voltage output end of the power supply, therefore, after the time relay coil 3 is turned on, the delay snap contact 4 is turned on, so that the intermediate relay coil 5 is turned on, and further, the three intermediate snap contacts can be closed.
In short, the first end and the second end of the delay moving contact 4 are two terminals of the delay moving contact respectively, and the first end and the second end of the middle moving contact are two terminals of the middle moving contact respectively.
In one embodiment, the intermediate relay coil 5 and the three intermediate moving contacts are the coil and the moving contacts, respectively, in the same intermediate relay. The intermediate relay in this embodiment is an electromagnetic relay, and the intermediate relay coil 5 generates magnetic force after being powered by a power supply, and the magnetic force can attract the armature of the electromagnetic relay, and the armature moves and drives the intermediate moving contact to move, so that the intermediate moving contact can be closed, and the three intermediate moving contacts are turned on. The intermediate relay in this embodiment may serve the function of an outlet relay.
The structure of the intermediate relay is not particularly limited in this embodiment, and in one preferred embodiment, specifically, the intermediate relay further includes a case provided with a recess, and a test button provided on a bottom wall of the recess and having a height in a depth direction of the recess smaller than a height of a sidewall of the recess, the test button being for tripping the ground tank breaker after being turned on. Because the test button on the intermediate relay of prior art often stands out outside the casing, consequently causes personnel's spurious triggering easily, and directly leads to falling to the ground tank circuit breaker tripping operation, consequently adopt modified structure in this embodiment, the test button does not stand out from the casing is outside outstanding, but wholly lies in the recess, thereby can effectively prevent that its test button from being triggered by personnel's spurious triggering, greatly reduce personnel's spurious triggering test button and cause the possibility that falls to the ground tank circuit breaker spurious tripping, thereby further improved the inconsistent protection circuit's of circuit breaker three-phase reliability and stability.
Specifically, the three intermediate moving-on contacts include a first intermediate moving-on contact 61, a second intermediate moving-on contact 62, and a third intermediate moving-on contact 63, and the three trip coils include a first trip coil 71, a second trip coil 72, and a third trip coil 73; the first end of the first middle dynamic contact 61, the first end of the second middle dynamic contact 62 and the first end of the third middle dynamic contact 63 are connected to an electric connection line between the second end of the dynamic break contact parallel unit 1 and the first end of the dynamic break contact parallel unit 2; a second end of the first intermediate moving contact 61 is connected to a current inflow end of the first trip coil 71, and a current outflow end of the first trip coil 71 is connected to a negative voltage output end of the power supply; a second end of the second intermediate moving contact 62 is connected to a current inflow end of the second trip coil 72, and a current outflow end of the second trip coil 72 is connected to a negative voltage output end of the power supply; a second end of the third intermediate moving-on contact 63 is connected with a current inflow end of the third tripping coil 73, and a current outflow end of the third tripping coil 73 is connected with a negative voltage output end of the power supply; when the movable contact parallel unit 1 is turned on, the power supply supplies power to the first, second, and third trip coils 71, 72, and 73 through the turned-on movable contact parallel unit 1 to trip the ground tank type circuit breaker.
In this embodiment, the trip coil in this embodiment is a trip coil of a ground tank circuit breaker, and the power supply can supply power to the trip coil through the conductive breaking contact parallel unit 1. The trip coil, when energized, causes the ground tank circuit breaker to trip. When the three-phase switches of the ground tank type circuit breaker are in inconsistent opening and closing states, the dynamic breaking contact parallel unit 1 and the dynamic closing contact parallel unit 2 are conducted simultaneously, and three middle dynamic closing contacts are conducted.
Since the existing floor tank circuit breaker generally adopts split-phase operation, in this embodiment, the open-close states of the three auxiliary dynamic open contacts and the three auxiliary dynamic close contacts respectively correspond to the open-close states of the three-phase switch of the tank circuit breaker, and for the three phases of the floor tank circuit breaker are respectively the a phase, the B phase and the C phase, as shown in fig. 1, the three auxiliary dynamic open contacts and the three auxiliary dynamic close contacts respectively correspond to the a phase, the B phase and the C phase. In addition, the three middle movable contact contacts and the three tripping coils respectively correspond to the A phase, the B phase and the C phase.
In the three-phase inconsistent protection circuit of the circuit breaker in the embodiment, the current inflow end of the trip coil is connected to the second end of the middle dynamic contact, the second end of the middle dynamic contact is connected to the electric connection line between the second end of the dynamic contact parallel unit 1 and the first end of the dynamic contact parallel unit 2, so that the trip coil can be powered only when the dynamic contact parallel unit 1 and the dynamic contact parallel unit 2 are simultaneously conducted, and the three-phase inconsistent switching states of the circuit breaker inevitably exist if the dynamic contact parallel unit 1 and the dynamic contact parallel unit 2 are simultaneously conducted, therefore, the three-phase inconsistent protection circuit of the circuit breaker in the embodiment of the application can ensure that the ground tank circuit breaker trips only when the three-phase switches of the circuit breaker are inconsistent in the switching states, and the ground tank circuit breaker cannot malfunction under adverse environmental factors, therefore, the reliability and stability of the three-phase inconsistent circuit of the circuit breaker can be guaranteed.
Optionally, the intermediate relay further comprises a fourth intermediate moving contact 64, the fourth intermediate moving contact 64 comprising a first end and a second end; a first end of the fourth intermediate moving contact 64 is connected with a first end of the delay moving contact 4, and a second end of the fourth intermediate moving contact 64 is connected with a second end of the delay moving contact 4; after the power supply supplies power to the intermediate relay coil 5 through the conducted time-delay moving contact 4, the intermediate relay coil 5 obtains the power supply to enable the fourth intermediate moving contact 64 to be conducted, and after the time-delay moving contact 4 is disconnected, the state that the intermediate relay coil 5 is powered by the power supply is maintained.
Specifically, the intermediate relay coil 5 is a coil of an intermediate relay, and the first intermediate moving contact 61, the second intermediate moving contact 62, and the third intermediate moving contact 63 are moving contacts in the same intermediate relay, and the fourth intermediate moving contact 64 is also a moving contact of the intermediate relay. That is, like the first intermediate moving contact 61, the second intermediate moving contact 62, and the third intermediate moving contact 63, when the intermediate relay coil 5 is energized, the fourth intermediate moving contact 64 is closed and conducted. When the opening and closing states of the three-phase switch of the floor tank type circuit breaker are inconsistent, after the power supply supplies power to the intermediate relay coil 5, the fourth intermediate dynamic contact 64 is conducted, and the fourth intermediate dynamic contact 64 is connected in parallel at two ends of the delay dynamic contact 4, so that the intermediate relay coil 5, the fourth intermediate dynamic contact 64 and the delay dynamic contact 4 form self-locking after the intermediate relay coil 5 is electrified, and after the self-locking, even if the delay dynamic contact 4 is disconnected, the state of the intermediate relay coil 5 supplied with power can still be kept.
Optionally, the three-phase inconsistent protection circuit of the circuit breaker in this embodiment further includes a reset button 8, where the reset button 8 includes a first end and a second end; a first end of the reset button 8 is connected to a first end of the delay dynamic joint contact 4, a second end of the reset button 8 is connected to a first end of the fourth middle dynamic joint contact 64, and a second end of the fourth middle dynamic joint contact 64 is connected to a second end of the delay dynamic joint contact 4; when the reset button 8 is pressed to be switched off, and the fourth middle movable contact 64 is switched on, the three-phase inconsistent protection circuit of the circuit breaker is reset.
Specifically, the reset button 8 can reset the three-phase inconsistent protection circuit of the circuit breaker. The first end and the second end of the reset button 8 are two terminals of the reset button 8, respectively. Optionally, the reset button 8 is a normally closed button, so that it opens when depressed. The reset button 8 in this embodiment is connected in series with the fourth intermediate moving contact 64, and after being connected in series, is connected in parallel with the delay moving contact 4. The intermediate relay coil 5 is powered on when the delay dynamic closing contact 4 is switched on, the intermediate relay coil 5 is self-locked by the fourth intermediate dynamic closing contact 64, the delay dynamic closing contact 4 is disconnected from the intermediate relay coil 5 and cannot be powered off, then the reset button is pressed down, the reset button 8 is changed from a closed state to an open state, the power supply is disconnected from the intermediate relay coil 5, the intermediate relay coil 5 is powered off, the fourth intermediate dynamic closing contact 64, the first intermediate dynamic closing contact 61, the second intermediate dynamic closing contact 62 and the third intermediate dynamic closing contact 63 are all disconnected, and the purpose of resetting the inconsistent three-phase protection circuit of the circuit breaker is achieved.
Optionally, the three-phase inconsistent protection circuit of the circuit breaker in this embodiment further includes a first pressing plate 10, where the first pressing plate 10 includes a first end and a second end; a first end of the first pressing plate 10 is connected with a current outflow end of the time relay coil 3, and a second end of the first pressing plate 10 is connected with a negative voltage output end of the power supply; after the first pressing plate 10 is disconnected, the power supply disconnects the power supply of the time relay coil 3.
The first presser plate 10 in this embodiment functions to open or close an electric circuit. The first end and the second end of the first presser plate 10 are two terminals of the first presser plate 10, respectively. The first pressing plate 10 is pressed to enable the first pressing plate 10 to be disconnected or connected from a circuit, after the first pressing plate 10 is pressed by a worker to be conducted, the time relay coil 3 can obtain power supply on the basis that the movable contact breaking parallel unit 1 and the movable contact breaking parallel unit 2 are conducted, the time delay movable contact 4 is conducted in a delayed preset time mode, if the first pressing plate 10 is disconnected, the connection between the time delay relay coil 3 and a negative voltage output end of a power supply is disconnected, and therefore the power supply of the time relay coil 3 is disconnected.
Optionally, the three-phase inconsistent protection circuit of the circuit breaker in the present embodiment further includes a second pressing plate 20, where the second pressing plate 20 includes a first end and a second end; a first end of the first intermediate dynamic contact 61, a first end of the second intermediate dynamic contact 62 and a first end of the third intermediate dynamic contact 63 are connected and then connected to a first end of the second pressing plate 20, and a second end of the second pressing plate 20 is connected to an electric connection line between a second end of the dynamic break contact parallel unit 1 and a first end of the dynamic break contact parallel unit 2; after the second pressure plate 20 is disconnected, the power supply disconnects the power to the trip coil.
Specifically, the first end and the second end of the second presser plate 20 are two terminals of the second presser plate 20, respectively. The user can open or close the second pressing plate 20 from the circuit by pressing the second pressing plate 20, so that the connection between the first intermediate make contact 61, the second intermediate make contact 62, the third intermediate make contact 63 and the electrical connection lines between the second end of the break contact parallel unit 1 and the first end of the make contact parallel unit 2 can be switched on or off, and when the second pressing plate 20 is disconnected and not switched on, the three trip coils cannot obtain power supply.
Optionally, the three-phase inconsistent protection circuit of the circuit breaker in this embodiment further includes: the switching-off relay comprises a switching-off relay coil 91 and three switching-off moving contact terminals 92, and the switching-off button 93 comprises a first end and a second end, wherein the switching-off relay coil 91 comprises a current inflow end and a current outflow end; the current inflow end of the opening relay coil 91 is connected with the positive voltage output end of the power supply, the current outflow end of the opening relay coil 91 is connected with the first end of the opening button 93, the second end of the opening button 93 is connected with the negative voltage output end of the power supply, the first ends of the three opening and closing contacts 92 are connected with the positive voltage output end of the power supply, and the second ends of the three opening and closing contacts 92 are respectively connected with the current inflow ends of the three tripping coils; when the opening button 93 is pressed to be turned on, the power supply supplies power to the opening relay coil 91, the opening relay coil 91 obtains the power supply to turn on the three opening and closing contacts 92, and the power supply supplies power to the tripping coil through the three opening and closing contacts 92 so as to open the floor tank type circuit breaker. The first end and the second end of the opening button 93 are two terminals of the opening button 93, respectively. This make can-type circuit breaker that can fall to ground can be by manual separating brake when its three-phase switch open and shut the state unanimity, only need the staff to press the separating brake button and make it switch on, just can make the trip coil get electric, arouse and fall to ground can-type circuit breaker separating brake to withdraw from operating condition fast.
Optionally, at least one first current limiting resistor R1 is connected in parallel to two ends of the intermediate relay coil 5, and the first current limiting resistor R1 is connected in parallel to two ends of the intermediate relay coil 5, so that the first current limiting resistor R1 plays a role in limiting current, and can also effectively divide voltage across the two ends of the intermediate relay coil 5 after power-on, thereby preventing the intermediate relay coil 5 from being damaged to the greatest extent, and ensuring the stability of the three-phase inconsistent protection circuit of the circuit breaker in this embodiment.
Further optionally, at least one second current limiting resistor R2 is connected in parallel to two ends of the trip coil, and the second current limiting resistor R2 is connected in parallel to two ends of the trip coil, and the second current limiting resistor R2 plays a role in limiting current, and can also effectively divide voltage across the trip coil after being powered on, so as to prevent the trip coil from being damaged to the greatest extent and ensure the stability of the three-phase inconsistent protection circuit of the circuit breaker in this embodiment.
The first current limiting resistor R1 may be any type of resistor, and in an alternative embodiment, there are two first current limiting resistors R1, at least one of which, the first current limiting resistor R1, is a varistor. In this embodiment, the resistance values of the first current limiting resistor R1 and the second current limiting resistor R2 are not limited, and only the actual use requirement can be met.
Optionally, at least one third current limiting resistor R3 may also be connected in parallel at two ends of the opening relay coil 91, and the third current limiting resistor R3 is connected in parallel at two ends of the opening relay coil 91, so that the third current limiting resistor R3 plays a role in current limiting, and voltage at two ends of the opening relay coil 91 may also be effectively divided after power-on, thereby preventing the opening relay coil 91 from being damaged to the greatest extent, and ensuring stability of the three-phase inconsistent protection circuit of the circuit breaker in this embodiment when the ground tank circuit breaker is opened. Similarly, the resistance of the third current limiting resistor R3 is not limited in this embodiment, and only needs to be able to meet practical requirements. In an alternative embodiment, the third current limiting resistor R3 is a voltage dependent resistor.
The following is a summary of the present embodiment, and a general description of the trip process of the three-phase inconsistent circuit of the breaker in the present embodiment for the ground tank breaker is provided in conjunction with the specific drawings, it should be understood that the description is only for convenience of understanding and is not a limitation in the present embodiment.
Referring to the circuit structure in fig. 1, when the open and close states of the three-phase switches of the ground tank breaker are not consistent, it is easy to understand that, taking the example that the a phase is not closed and the B phase and the C phase are closed, the auxiliary dynamic open contact a1 in the dynamic open contact parallel unit 1 does not act to maintain the closed state, the auxiliary dynamic open contact B1 and the auxiliary dynamic open contact C1 are opened, the auxiliary dynamic close contact a2 in the dynamic close contact parallel unit 2 maintains the open state, and the auxiliary dynamic close contact B2 and the auxiliary dynamic close contact C2 are closed, so that the auxiliary dynamic open contact a1 is closed, the auxiliary dynamic close contact B2 is closed, and the auxiliary dynamic close contact C2 is closed, so that the dynamic open contact parallel unit 1 and the dynamic close contact parallel unit 2 are simultaneously conducted. The positive voltage output end of the power supply is connected to the current inflow end of the time relay coil 3 from the conducted break contact parallel unit 1 and the break contact parallel unit 2, and the time relay coil 3 is electrified; the time relay coil 3 and the time delay closing contact 4 are coils and time delay closing contacts in the time relay, so that the time delay closing contact 4 is conducted after the time relay coil 3 is electrified and a preset time is delayed, the intermediate relay coil 5 is electrified, the fourth intermediate closing contact 64 is closed and conducted, and the fourth intermediate closing contact, the time delay closing contact 4 and the intermediate relay coil 5 form self-locking to maintain the electrified state of the intermediate relay coil 5. The intermediate relay coil 5, the first intermediate moving-contact 61, the second intermediate moving-contact 62, the third intermediate moving-contact 63 are the coil and the moving-contact in the intermediate relay, and the fourth intermediate moving-contact 64 is also the moving-contact of the intermediate relay. Therefore, the intermediate relay coil 5 is energized to close all the first intermediate moving contact 61, the second intermediate moving contact 62 and the third intermediate moving contact 63, and further, the first trip coil 71, the second trip coil 72 and the third trip coil 73 are energized to trip the ground tank circuit breaker.
When the reset button 8 is pressed down, the circuit is disconnected, the intermediate relay coil 5 loses power, the first intermediate movable contact 61, the second intermediate movable contact 62 and the third intermediate movable contact 63 are all disconnected, and the first tripping coil 71, the second tripping coil 72 and the third tripping coil 73 lose power, so that the three-phase inconsistent protection circuit of the circuit breaker is reset.
The opening button 93 is pressed, the opening relay coil 91 is electrified, so that the three opening and closing contacts 92 are all conducted, and the three second auxiliary opening and closing contacts are also in a conducting state at the moment, so that the first tripping coil 71, the second tripping coil 72 and the third tripping coil 73 are all electrified, and the ground tank type circuit breaker is opened.
In addition, in fig. 1, a first current limiting resistor R1 is connected in parallel to two ends of the intermediate relay coil 5, which plays a role of current limiting and can also divide the voltage across the intermediate relay coil; three second current limiting resistors R2 are respectively connected in parallel to two ends of the first trip coil 71, the second trip coil 72 and the third trip coil 73, and play a role in limiting current, and can also respectively divide voltages at two ends of the first trip coil 71, the second trip coil 72 and the third trip coil 73; the third current limiting resistor R3 is connected in parallel to the two ends of the opening relay coil 91, and plays a role of current limiting, and can also divide the voltage at the two ends. The first pressing plate 10 is pressed to be disconnected, so that the time relay coil 3 is disconnected with the negative voltage output end of the power supply, and the power supply cuts off the power supply of the time relay coil 3; alternatively, the second pressing plate 20 is pressed to be opened, so that all the connections between the first intermediate moving contact 61, the second intermediate moving contact 62, the third intermediate moving contact 63 and the electrical connection lines between the second end of the moving contact parallel unit 1 and the first end of the moving contact parallel unit 2 are opened, and the power supply to the trip coil is cut off.
It is understood that in fig. 1, the above phase a includes an auxiliary moving-open contact a1, an auxiliary moving-close contact a2, etc.; the phase B is related to the phase B and comprises an auxiliary dynamic open contact B1, an auxiliary dynamic close contact B2 and the like; and the phase C is related to the phase C and comprises an auxiliary dynamic open contact C1, an auxiliary dynamic close contact C2 and the like.
As can be seen from the above process, in the three-phase inconsistent protection circuit of the circuit breaker in the embodiment, since the current inflow end of the trip coil is connected to the second end of the intermediate moving contact, and the first end of the intermediate moving contact is connected to the electrical connection line between the second end of the moving contact parallel unit 1 and the first end of the moving contact parallel unit 2, the trip coil can be powered only when the moving contact parallel unit 1 and the moving contact parallel unit 2 are simultaneously conducted, and the three-phase switch open/close states of the ground tank type circuit breaker are necessarily inconsistent if the moving contact parallel unit 1 and the moving contact parallel unit 2 are simultaneously conducted, so that the ground tank type circuit breaker can be tripped only when the three-phase switch open/close states of the ground tank type circuit breaker are inconsistent, and can not malfunction under adverse environmental factor to can guarantee circuit breaker three-phase nonconformity circuit's reliability and stability, on this basis, even someone has triggered the test button of auxiliary relay by mistake and also can not arouse tank circuit breaker's mistake tripping operation, guaranteed circuit breaker three-phase nonconformity protection circuit's reliability, and fall to the ground the safety when tank circuit breaker uses. In addition, because the test button of the improved intermediate relay used does not protrude out of the shell of the intermediate relay, but is integrally positioned in the groove, personnel are difficult to trigger the test button under the condition that other tools are not used to go deep into the groove, so that the intermediate relay of the type is applied to the three-phase inconsistent protection circuit of the circuit breaker in the embodiment, the possibility that the fault tripping of the floor tank type circuit breaker is caused by the fact that the personnel trigger the test button by mistake can be greatly reduced, and the reliability and the stability of the three-phase inconsistent protection circuit of the circuit breaker are further improved.
The expressions "first", "second", "first" or "second" used in various embodiments of the present application may modify various components without regard to order and/or importance, but these expressions do not limit the respective components. The above description is only configured for the purpose of distinguishing elements from other elements. For example, the first user equipment and the second user equipment represent different user equipment, although both are user equipment. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. The utility model provides a circuit breaker three-phase nonconformity protection circuit for fall to ground the three-phase nonconformity protection of tank circuit breaker, its characterized in that, fall to ground the tank circuit breaker and include three trip coil, trip coil includes current inflow end and current outflow end, the circuit breaker three-phase nonconformity protection circuit includes: the device comprises a dynamic break contact parallel unit (1), a dynamic make contact parallel unit (2), a time relay and an intermediate relay; the time relay comprises a time relay coil (3) and a time delay dynamic closing contact (4), and the intermediate relay comprises an intermediate relay coil (5) and three intermediate dynamic closing contacts;
the movable break contact parallel unit (1) comprises a first end and a second end, and three auxiliary movable break contacts which are connected in parallel between the first end of the movable break contact parallel unit (1) and the second end of the movable break contact parallel unit (1); the movable contact parallel unit (2) comprises a first end and a second end, and three auxiliary movable contacts connected in parallel between the first end of the movable contact parallel unit (2) and the second end of the movable contact parallel unit (2);
the time relay coil (3) comprises a current inflow end and a current outflow end, the time delay dynamic contact (4) comprises a first end and a second end, the intermediate relay coil (5) comprises a current inflow end and a current outflow end, and the intermediate dynamic contact comprises a first end and a second end;
the first end of the movable contact parallel unit (1) is connected with the positive voltage output end of a power supply, the second end of the movable contact parallel unit (1) is connected with the first end of the movable contact parallel unit (2), the second end of the movable contact parallel unit (2) is connected with the first end of the time relay coil (3), and the second end of the time relay coil (3) is connected with the negative voltage output end of the power supply; the first end of the delay dynamic closing contact (4) is connected with the positive voltage output end of the power supply, the second end of the delay dynamic closing contact (4) is connected with the first end of the intermediate relay coil (5), and the second end of the intermediate relay coil (5) is connected with the negative voltage output end of the power supply; the first end of each middle dynamic contact in the three middle dynamic contacts is connected to an electric connecting line between the second end of the dynamic contact parallel unit (1) and the first end of the dynamic contact parallel unit (2), the second end of each middle dynamic contact in the three middle dynamic contacts is connected with the current inflow end of one trip coil, and the current outflow end of each trip coil in the three trip coils is connected with the negative voltage output end of the power supply;
when the opening and closing states of the three-phase switch of the floor tank type circuit breaker are inconsistent, at least one auxiliary break contact in the three auxiliary break contacts is conducted, at least one auxiliary make contact in the three auxiliary make contacts is conducted, so that the break contact parallel unit (1) and the make contact parallel unit (2) are conducted simultaneously, the power supply supplies power to the time relay coil (3), the time relay coil (3) is conducted after being powered by the power supply for a preset time, the time delay make contact (4) is conducted, the power supply supplies power to the intermediate relay coil (5) through the conducted time delay make contact (4), the intermediate relay coil (5) conducts the three intermediate make contacts after obtaining the power supply, and the power supply supplies power to the tripping coil through the conducted break contact parallel unit (1) and the intermediate make contact, to trip the ground tank circuit breaker.
2. The circuit breaker three-phase inconsistent protection circuit of claim 1,
the three intermediate moving contact contacts comprise a first intermediate moving contact (61), a second intermediate moving contact (62) and a third intermediate moving contact (63), and the three tripping coils comprise a first tripping coil (71), a second tripping coil (72) and a third tripping coil (73);
the first end of the first middle dynamic contact (61), the first end of the second middle dynamic contact (62) and the first end of the third middle dynamic contact (63) are connected and then connected to an electric connection line between the second end of the dynamic disconnection contact parallel unit (1) and the first end of the dynamic connection contact parallel unit (2);
the second end of the first intermediate movable contact (61) is connected with the current inflow end of the first tripping coil (71), and the current outflow end of the first tripping coil (71) is connected with the negative voltage output end of the power supply;
the second end of the second intermediate movable contact (62) is connected with the current inflow end of the second tripping coil (72), and the current outflow end of the second tripping coil (72) is connected with the negative voltage output end of the power supply;
the second end of the third intermediate movable contact (63) is connected with the current inflow end of the third tripping coil (73), and the current outflow end of the third tripping coil (73) is connected with the negative voltage output end of the power supply;
when the movable contact parallel unit (1) is turned on, the power supply supplies power to the first trip coil (71), the second trip coil (72) and the third trip coil (73) through the turned-on movable contact parallel unit (1) to trip the ground tank type circuit breaker.
3. The circuit breaker three-phase inconsistent protection circuit of claim 2, wherein the intermediate relay further comprises a fourth intermediate moving contact (64), the fourth intermediate moving contact (64) comprising a first end and a second end;
the first end of the fourth intermediate dynamic joint contact (64) is connected with the first end of the delay dynamic joint contact (4), and the second end of the fourth intermediate dynamic joint contact (64) is connected with the second end of the delay dynamic joint contact (4);
after the power supply supplies power to the intermediate relay coil (5) through the conducted delay on contact (4), the intermediate relay coil (5) obtains the power supply and then conducts the fourth intermediate on contact (64), and after the delay on contact (4) is disconnected, the state that the intermediate relay coil (5) is powered by the power supply is maintained.
4. The circuit breaker three phase delta inconsistent protection circuit of claim 3, further comprising a reset button (8), the reset button (8) comprising a first end and a second end;
the first end of the reset button (8) is connected with the first end of the delay dynamic joint contact (4), the second end of the reset button (8) is connected with the first end of the fourth intermediate dynamic joint contact (64), and the second end of the fourth intermediate dynamic joint contact (64) is connected with the second end of the delay dynamic joint contact (4);
when the reset button (8) is pressed to be disconnected and the fourth middle dynamic joint contact (64) is conducted, the three-phase inconsistent protection circuit of the circuit breaker is reset.
5. The circuit breaker three-phase inconsistent protection circuit of claim 2, further comprising a first pressure plate (10), the first pressure plate (10) comprising a first end and a second end;
the first end of the first pressing plate (10) is connected with the current outflow end of the time relay coil (3), and the second end of the first pressing plate (10) is connected with the negative voltage output end of the power supply; and after the first pressing plate (10) is disconnected, the power supply disconnects the power supply of the time relay coil (3).
6. The circuit breaker three-phase inconsistent protection circuit of claim 2, further comprising a second pressure plate (20), the second pressure plate (20) comprising a first end and a second end;
the first end of the first middle dynamic contact (61), the first end of the second middle dynamic contact (62) and the first end of the third middle dynamic contact (63) are connected and then connected to the first end of the second pressing plate (20), and the second end of the second pressing plate (20) is connected to an electric connection line between the second end of the dynamic break contact parallel unit (1) and the first end of the dynamic break contact parallel unit (2); and after the second pressing plate (20) is disconnected, the power supply disconnects the power supply of the tripping coil.
7. The circuit breaker three-phase inconsistent protection circuit of claim 1, further comprising:
the switching-off relay comprises a switching-off relay coil (91) and three switching-off and closing contacts (92), the switching-off button (93) comprises a first end and a second end, and the switching-off relay coil (91) comprises a current inflow end and a current outflow end;
the current inflow end of the opening relay coil (91) is connected with the positive voltage output end of the power supply, the current outflow end of the opening relay coil (91) is connected with the first end of an opening button (93), the second end of the opening button (93) is connected with the negative voltage output end of the power supply, the first ends of the three opening and closing contacts (92) are connected with the positive voltage output end of the power supply, and the second ends of the three opening and closing contacts (92) are respectively connected with the current inflow ends of the three tripping coils;
when the opening button (93) is pressed to be conducted, the power supply supplies power to the opening relay coil (91), the opening relay coil (91) enables the three opening and closing contacts (92) to be conducted after power supply is obtained by the opening relay coil, and the power supply supplies power to the tripping coil through the conducted three opening and closing contacts (92) so that the ground tank type circuit breaker is opened.
8. Three-phase inconsistent protection circuit of circuit breaker according to claim 1, characterized in that at least one first current limiting resistor is connected in parallel at both ends of the intermediate relay coil (5).
9. The circuit breaker three-phase inconsistent protection circuit of claim 1, wherein at least one second current limiting resistor is connected in parallel across the trip coil.
10. The breaker three-phase inconsistent protection circuit of any one of claims 1 to 9, wherein the intermediate relay further comprises a housing and a test button, the housing is provided with a groove, the test button is arranged on a bottom wall of the groove, the height of the test button along the depth direction of the groove is smaller than the height of a side wall of the groove, and the test button is used for tripping the floor type tank breaker after being conducted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121712725.5U CN215934443U (en) | 2021-07-27 | 2021-07-27 | Three-phase inconsistent protection circuit of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121712725.5U CN215934443U (en) | 2021-07-27 | 2021-07-27 | Three-phase inconsistent protection circuit of circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN215934443U true CN215934443U (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121712725.5U Active CN215934443U (en) | 2021-07-27 | 2021-07-27 | Three-phase inconsistent protection circuit of circuit breaker |
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| CN (1) | CN215934443U (en) |
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2021
- 2021-07-27 CN CN202121712725.5U patent/CN215934443U/en active Active
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Address after: 310018 No. 128, 18th Street (East), Hangzhou Economic and Technological Development Zone, Zhejiang Province Patentee after: Siemens Energy High Voltage Switch (Hangzhou) Co.,Ltd. Address before: 310018 No. 128, 18th Street (East), Hangzhou Economic and Technological Development Zone, Zhejiang Province Patentee before: Siemens (Hangzhou) high voltage switch Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |