CN215817502U - Motor closing coil protection device - Google Patents
Motor closing coil protection device Download PDFInfo
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- CN215817502U CN215817502U CN202121473673.0U CN202121473673U CN215817502U CN 215817502 U CN215817502 U CN 215817502U CN 202121473673 U CN202121473673 U CN 202121473673U CN 215817502 U CN215817502 U CN 215817502U
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- 230000001012 protector Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a protection device for a closing coil of a motor, which comprises a protector, a starting circuit and a fault output circuit, wherein the protector is connected with the starting circuit; the protector comprises a starting contact and a fault output contact; the starting circuit is electrically connected with the starting contact through the normally closed contact of the contactor; the fault output circuit comprises a contactor coil and a contactor normally open contact; the first end of the fault output contact is electrically connected with a first power supply, and is electrically connected with the contactor coil through the normally open contact of the contactor, and the second end of the fault output contact is electrically connected with the contactor coil. According to the protection device for the motor closing coil, the fault output circuit is connected with the fault output contact, the first end of the fault output contact is electrically connected with the first power supply, and meanwhile, the normally open contact of the contactor is electrically connected with the contactor coil, so that the fault output contact can output a fault signal during tripping, the contactor coil can keep an electrified state after resetting, the starting circuit is controlled to be disconnected with the contact, and the motor is effectively prevented from being started in the fault state.
Description
Technical Field
The utility model relates to the field of starting circuits, in particular to a protection device for a closing coil of a motor.
Background
The 10kV high-voltage switch cabinet motor comprehensive protection device is easy to generate faults of overcurrent, blockage, quick break and the like in the starting process or the running process of the motor due to the internal design problem.
An operator starts and stops the equipment on a field operation column, and after the equipment is started and once fault reporting is carried out, although the fault of the protector is still reported, the fault point is kept in a closed state and is automatically disconnected after a short time (about 6 seconds). Because the operating personnel opens and stops on the spot, can not see the distribution room protector condition, can think that equipment does not have the trouble and does not start successfully, can start equipment many times, cause many times heavy current rush, start many times under this condition, very easily cause the motor winding to burn out, cause the single-phase ground connection of system 10kV, after the ground connection, because of one phase earthing voltage is zero, another two-phase voltage rises to the line voltage, lead to the voltage that the motor bore to rise, all electrical equipment insulation in the whole system suffers the destruction of different degrees, cause unpredictable hidden trouble. Even the overvoltage protector bears over-high voltage to cause two-phase breakdown arc short circuit, and the system voltage is pulled down to cause the severe consequence of large-area power failure of equipment, so that great potential safety hazard exists.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a protection device for a closing coil of a motor, which can avoid the expansion of accidents caused by secondary accidents (such as short circuit) when the motor is started in a fault state.
The embodiment of the utility model provides a protection device for a closing coil of a motor, which comprises:
a protector, the protector comprising: a start contact and a fault output contact;
the starting circuit is electrically connected with the starting contact through a contactor normally closed contact;
a fault output circuit, the fault output circuit comprising: a contactor coil and a contactor normally open contact; the first end of the fault output contact is electrically connected with a first power supply, and meanwhile, the first end of the fault output contact is electrically connected with the contactor coil through the normally open contact of the contactor; the second end of the fault output contact is electrically connected with the contactor coil.
According to an embodiment of the present invention, a protection device for a motor closing coil further includes: and the starting contact is electrically connected with a second power supply through the closing coil.
According to an embodiment of the present invention, there is provided a protection device for a closing coil of a motor, where the starting contact includes: a first start contact and a second start contact;
the first starting contact is electrically connected with the second power supply through the starting circuit; the second starting contact is electrically connected with the second power supply through the closing coil.
According to an embodiment of the present invention, a protection device for a closing coil of a motor is provided, where the starting circuit includes:
starting a switch; the first starting contact is electrically connected with the second power supply through the contactor normally closed contact and the starting switch in sequence.
According to the protection device for the closing coil of the motor, which is provided by one embodiment of the utility model, the first power supply is a 220V alternating current power supply.
According to the protection device for the closing coil of the motor, provided by one embodiment of the utility model, the second power supply is a 220V alternating current power supply.
According to an embodiment of the present invention, there is provided a protection device for a closing coil of a motor, where the fault output contact includes: a first fault output contact and a second fault output contact;
the first fault output contact is electrically connected with the first power supply, and meanwhile, the first fault output contact is electrically connected with the contactor coil through the normally open contact of the contactor; the second fault output contact is electrically connected with the contactor coil.
According to an embodiment of the present invention, there is provided a protection device for a closing coil of a motor, the protection device further including: a timing circuit;
the motor closing coil protection device is provided with a fault output state;
in the fault output state, the timing circuit communicates the first fault output contact and the second fault output contact; the first power supply is electrically connected with the contactor coil sequentially through the first fault output contact and the second fault output contact.
According to the protection device for the motor closing coil, which is provided by one embodiment of the utility model, the protection device for the motor closing coil is also provided with a fault reset state;
in the fault reset state, the timing circuit opens the first fault output contact and the second fault output contact; and the first power supply is electrically connected with the contactor coil sequentially through the first fault output contact and the normally open contact of the contactor.
According to the protection device for the motor closing coil, which is provided by one embodiment of the utility model, the protection device for the motor closing coil is also provided with a normal state;
in the normal state, the timing circuit opens the first faulty output contact and the second faulty output contact; the second fault output contact is electrically connected with the contactor coil.
According to the protection device for the motor closing coil, the starting circuit is connected with the starting contact, the fault output circuit is connected with the fault output contact, the first end of the fault output contact is electrically connected with the first power supply, and meanwhile, the first end of the fault output contact is electrically connected with the contactor coil through the normally open contact of the contactor; the second end of trouble output contact is connected with the contactor coil electricity for if the tripping operation that breaks down after the start, trouble output contact can output fault signal, and after reseing, the contactor coil can keep the state of being electrified moreover, and control starting circuit and contact disconnection effectively avoid the motor to start under the fault condition.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a protection device for a closing coil of a motor in the prior art;
fig. 2 is a schematic structural diagram of a motor closing coil protection device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the starting process of the existing motor, as shown in fig. 1, after a starting switch SB4 is pressed, a protector DMP371 receives a starting signal, starting contacts (C13 and C5) are switched on to supply power to a closing coil, and after the closing coil is powered on, a breaker is closed, and the motor is started immediately. If fault tripping occurs, the fault output contacts (B4 and B5) are connected, a fault signal is output, automatic resetting is carried out after 6 seconds, the fault output contacts (B4 and B5) are disconnected, the switch-on coil is electrified after the start button of the start switch SB4 is pressed at the moment, and the motor can still be started for the second time. When the motor is started under the condition, the motor winding is easy to burn,
in order to solve the above problem, the present invention provides a protection device for a motor closing coil, as shown in fig. 2, the protection device 1 for a motor closing coil includes: protector, starting circuit and trouble output circuit.
Wherein, the protector includes: start contacts (C13 and C5) and fault output contacts (B4 and B5). The starting circuit is electrically connected with the starting contacts (C13 and C5) through the contactor normally closed contact KA 1. The fault output circuit includes: a contactor coil KA and a contactor normally open contact KA 2. The first ends of the fault output contacts (B4 and B5) are electrically connected with a first power supply through a circuit breaker QF2, and the first power supply is 220V alternating current power supply. Meanwhile, the first ends of the fault output contacts (B4 and B5) are electrically connected with the contactor coil KA through the contactor normally open contact KA 2. The second ends of the fault output contacts (B4 and B5) are electrically connected to the contactor coil KA.
When the motor needs to be started, the starting circuit is switched on. The starting circuit is electrically connected with starting contacts (C13 and C5) through a contactor normally closed contact KA1, and the motor is started immediately. In the process of starting and normally operating the motor, if fault tripping occurs, fault output contacts (B4 and B5) are connected, as the first ends of the fault output contacts (B4 and B5) are electrically connected with a first power supply through a breaker QF2, and the second ends of the fault output contacts (B4 and B5) are electrically connected with a contactor coil KA, the contactor coil KA is electrified, and a contactor normally-open contact KA2 is connected with the contactor coil KA and the fault output contacts (B4 and B5), so that self-locking is realized. And simultaneously, the contactor normally closed contact KA1 opens the starting contacts (C13 and C5) and the starting circuit. Even if the contactor is automatically reset, the power-on state of the contactor coil KA can still be maintained, so that the starting contacts (C13 and C5) and the starting circuit are kept disconnected, and even if the starting circuit is connected, the motor can not be started at all, so that the phenomenon that the motor is started in a fault state to cause secondary accidents (such as short circuit) to cause accident expansion is avoided.
According to the protection device for the motor closing coil, the starting circuit is connected with the starting contact, the fault output circuit is connected with the fault output contact, the first end of the fault output contact is electrically connected with the first power supply, and meanwhile, the first end of the fault output contact is electrically connected with the contactor coil through the normally open contact of the contactor; the second end of trouble output contact is connected with the contactor coil electricity for if the tripping operation that breaks down after the start, trouble output contact can output fault signal, and after reseing, the contactor coil can keep the state of being electrified moreover, and control starting circuit and contact disconnection effectively avoid the motor to start under the fault condition.
In another embodiment provided by the present invention, as shown in fig. 2, the protection device for a closing coil of a motor further includes: and a closing coil is arranged, and the starting contacts (C13 and C5) are electrically connected with a second power supply (provided with a circuit breaker QF1) through the closing coil. The second power supply is 220V alternating current power supply.
Wherein, the starting contact includes: a first actuating contact C13 and a second actuating contact C5. The first actuating contact C13 is electrically connected to the second power source through an actuating circuit. The second starting contact C5 is electrically connected to the second power source through the closing coil. The start-up circuit includes: switch SB4 is activated. The first starting contact C13 is electrically connected to the second power source through the contactor normally closed contact KA1 and the starting switch SB4 in this order.
When the motor needs to be started, the starting switch SB4 is pressed, the protector DMP371 receives a starting signal, the first starting contact C13 and the second starting contact C5 are connected to supply power to the closing coil, after the closing coil is electrified, the breaker QF1 corresponding to the second power supply is closed, and the motor is started immediately.
In still another embodiment provided by the present invention, as shown in fig. 2, the fault output contacts (B4 and B5) include: a first fail output contact B4 and a second fail output contact B5. The first fault output contact B4 is in electrical communication with a first power source, while the first fault output contact B4 is in electrical communication with the contactor coil KA through the contactor normally open contact KA 2. The second fault output contact B5 is electrically connected with the contactor coil KA.
Wherein, the protector still includes: a timing circuit. The motor closing coil protection device is provided with a fault output state, a fault reset state and a normal state.
The start-up circuit is switched on. The starting circuit is electrically connected with starting contacts (C13 and C5) through a contactor normally closed contact KA1, and the motor is started immediately. In the normal state, the timing circuit opens the first fail output contact B4 and the second fail output contact B5. The second fault output contact B5 is electrically connected with the contactor coil KA.
In the fault output state, the timing circuit communicates the first fault output contact B4 with the second fault output contact B5. The first power source is electrically connected to the contactor coil KA through the first and second fault output contacts B4 and B5 in sequence. When the contactor coil KA is electrified, the contactor normally open contact KA2 connects the contactor coil KA and a fault output contact (B4 and B5). The contactor normally closed contact KA1 opens the first start contact C13 and the start circuit.
After the timing circuit is controlled to be connected for preset time, for example, after 6 seconds, and a fault signal is output, the motor closing coil protection device is adjusted to a fault reset state through the timing circuit, and at the moment, the timing circuit disconnects the first fault output contact B4 and the second fault output contact B5. And a normally open contact KA2 of the contactor is connected with a contactor coil KA and a first fault output contact B4, so that self-locking is realized. The first power source is electrically connected with the contactor coil KA through the first fault output contact B4 and the contactor normally open contact KA2 in sequence. The power-on state of the coil KA of the contactor is maintained, so that the starting contacts (C13 and C5) and the starting circuit are kept disconnected, even if the starting circuit is connected, the motor can not be started at all, and the phenomenon that the motor is started in a fault state to cause secondary accidents to cause accident expansion is avoided.
According to the protection device for the motor closing coil, the starting circuit is connected with the starting contact, the fault output circuit is connected with the fault output contact, the first end of the fault output contact is electrically connected with the first power supply, and meanwhile, the first end of the fault output contact is electrically connected with the contactor coil through the normally open contact of the contactor; the second end of trouble output contact is connected with the contactor coil electricity for if the tripping operation that breaks down after the start, trouble output contact can output fault signal, and after reseing, the contactor coil can keep the state of being electrified moreover, and control starting circuit and contact disconnection effectively avoid the motor to start under the fault condition.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 of the embodiments of the present invention.
Claims (10)
1. The utility model provides a motor closing coil protection device which characterized in that includes:
a protector, the protector comprising: a start contact and a fault output contact;
the starting circuit is electrically connected with the starting contact through a contactor normally closed contact;
a fault output circuit, the fault output circuit comprising: a contactor coil and a contactor normally open contact; the first end of the fault output contact is electrically connected with a first power supply, and meanwhile, the first end of the fault output contact is electrically connected with the contactor coil through the normally open contact of the contactor; the second end of the fault output contact is electrically connected with the contactor coil.
2. The motor closing coil protection device of claim 1, further comprising: and the starting contact is electrically connected with a second power supply through the closing coil.
3. The motor closing coil protection device of claim 2, wherein the starting contact comprises: a first start contact and a second start contact;
the first starting contact is electrically connected with the second power supply through the starting circuit; the second starting contact is electrically connected with the second power supply through the closing coil.
4. The motor closing coil protection device of claim 3, wherein the starting circuit comprises:
starting a switch; the first starting contact is electrically connected with the second power supply through the contactor normally closed contact and the starting switch in sequence.
5. The motor closing coil protection device of claim 1, wherein the first power source is a 220V AC power source.
6. The motor closing coil protection device of claim 2, wherein the second power source is a 220V AC power source.
7. The motor closing coil protection device according to any one of claims 1 to 6, wherein the fault output contact comprises: a first fault output contact and a second fault output contact;
the first fault output contact is electrically connected with the first power supply, and meanwhile, the first fault output contact is electrically connected with the contactor coil through the normally open contact of the contactor; the second fault output contact is electrically connected with the contactor coil.
8. The motor closing coil protection device of claim 7, wherein the protector further comprises: a timing circuit;
the motor closing coil protection device is provided with a fault output state;
in the fault output state, the timing circuit communicates the first fault output contact and the second fault output contact; the first power supply is electrically connected with the contactor coil sequentially through the first fault output contact and the second fault output contact.
9. The motor closing coil protection device according to claim 8, wherein the motor closing coil protection device is further provided with a fault reset state;
in the fault reset state, the timing circuit opens the first fault output contact and the second fault output contact; and the first power supply is electrically connected with the contactor coil sequentially through the first fault output contact and the normally open contact of the contactor.
10. The motor closing coil protection device according to claim 8, wherein the motor closing coil protection device is further provided with a normal state;
in the normal state, the timing circuit opens the first faulty output contact and the second faulty output contact; the second fault output contact is electrically connected with the contactor coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121473673.0U CN215817502U (en) | 2021-06-30 | 2021-06-30 | Motor closing coil protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121473673.0U CN215817502U (en) | 2021-06-30 | 2021-06-30 | Motor closing coil protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215817502U true CN215817502U (en) | 2022-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121473673.0U Active CN215817502U (en) | 2021-06-30 | 2021-06-30 | Motor closing coil protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215817502U (en) |
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2021
- 2021-06-30 CN CN202121473673.0U patent/CN215817502U/en active Active
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