CN212063480U - Under-voltage protection device - Google Patents
Under-voltage protection device Download PDFInfo
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- CN212063480U CN212063480U CN202020644724.0U CN202020644724U CN212063480U CN 212063480 U CN212063480 U CN 212063480U CN 202020644724 U CN202020644724 U CN 202020644724U CN 212063480 U CN212063480 U CN 212063480U
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- relay
- contactor
- undervoltage
- fuse
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Abstract
The utility model discloses an undervoltage protection device, which is characterized in that the A end of a breaker QF is connected with a fuse FU1 in series and then connected with the 5 end of an undervoltage relay KV, the 7 and 6 ends of the undervoltage relay KV are in short circuit, and the 8 end of the undervoltage relay KV is connected with the C end of the breaker QF; control little generating line L11 concatenates fuse FU2 and connects the 3 ends of undervoltage relay KV back, 13 ends of button SB1, the parallel connection end of 13 ends of contactor KM, 4 termination time relay HJ's of undervoltage relay KV 13 ends, button SB 1's 14 ends, the parallel connection end of 14 ends of contactor KM concatenates button SB2, connect 13 ends of contactor KM behind the time relay HJ, control little generating line L31 concatenates 14 ends of fuse FU3 and connect time relay HJ behind the fuse, the parallel connection end of 14 ends of contactor KM, the utility model has the characteristics of simple structure, reliable performance is high, the commonality is strong.
Description
Technical Field
The utility model belongs to the technical field of fault protection, especially, relate to an undervoltage protection device.
Background
In production practice, when the motor is normally operated, an excessive reduction in the power supply voltage will cause the motor speed to drop and even stall, and the motor current will increase sharply at a certain load torque to cause an overcurrent. Therefore, when the voltage drops to the minimum allowable value, the power supply needs to be cut off, the equipment is prevented from being burnt due to overload, and the running reliability of the motor is improved.
Disclosure of Invention
An object of the utility model is to improve the not enough of prior art and provide an undervoltage protection device that simple structure, reliable performance are high, the commonality is strong.
The utility model aims at realizing the same, the undervoltage protection device is characterized in that the A end of the plastic-shell breaker QF is connected with the 5 end of the undervoltage relay KV in series after the FU1, the 7 end of the undervoltage relay KV is connected with the 6 end of the undervoltage relay KV, and the 8 end of the undervoltage relay KV is connected with the C end of the plastic-shell breaker QF; the control small bus L11 is connected in series with a fuse FU2 and then connected with the 3 end of an undervoltage relay KV, the 13 end of a button SB1 and the parallel end of the 13 end of a contactor KM, the 4 end of the undervoltage relay KV is connected with the 13 end of a time relay HJ, the 14 end of the button SB1 and the parallel end of the 14 end of the contactor KM are connected in series with a button SB2 and the 13 end of the contactor KM and then connected with the 14 end of the time relay HJ and the parallel end of the 14 end of the contactor KM are connected in series with a fuse FU3 and then connected with the control small bus L31.
Compared with the prior art, the utility model has the following characteristics of showing and positive effect: the utility model discloses after system's voltage reduces, under voltage relay KV detects the voltage and crosses the action of low back contact, and the voltage range can make time relay HJ lose the electricity according to the particular case adjustment, opens and stops loop time relay HJ contact time delay disconnection, and the time delay can be adjusted according to the particular case, and main loop contactor KM coil loses the electricity disconnection, motor M stop motion. The utility model discloses safe, convenient, have easy to assemble, maintain advantages such as simple, safe and reliable, prevent that equipment from burning out because of transshipping, improved the reliability of motor operation, be convenient for popularize and promote. The device is an economic, intelligent and reliable device and has wide application prospect in the fields of civil use, industry, commerce and the like.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a circuit diagram of a primary main connection of a conventional motor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
An under-voltage protection device, refer to fig. 1, an a end of a molded case circuit breaker QF is connected in series with a fuse FU1 and then connected with a 5 end of an under-voltage relay KV, a 7 end of the under-voltage relay KV is connected with a 6 end of the under-voltage relay KV, and an 8 end of the under-voltage relay KV is connected with a C end of the molded case circuit breaker QF; the control small bus L11 is connected in series with a fuse FU2 and then connected with the 3 end of an undervoltage relay KV, the 13 end of a button SB1 and the parallel end of the 13 end of a contactor KM, the 4 end of the undervoltage relay KV is connected with the 13 end of a time relay HJ, the 14 end of the button SB1 and the parallel end of the 14 end of the contactor KM are connected with the 11 end of the button SB2, the 12 end of the button SB2 is connected with the 1 end of the time relay HJ, the 3 end of the time relay HJ is connected with the 13 end of the contactor KM, and the control small bus L31 is connected in series with the fuse FU3 and then connected with the 14 end of the time relay H.
In the embodiment, the contactor KM is CJX1 series, the undervoltage relay KV is DY-28C, the time relay HJ is ST3PE, the fuses FU1 and FU2 are RT18-32/6, and the molded case circuit breaker QF is NM1 series.
Use the utility model discloses in the time, will the utility model discloses correspond to insert in the main line circuit of current motor, refer to fig. 2, promptly the utility model discloses the A end of the moulded case circuit breaker QF of secondary circuit's moulded case circuit corresponds the A end of the main line circuit moulded case circuit breaker QF of access, and the C end of moulded case circuit breaker QF corresponds the C end of the main line circuit moulded case circuit breaker QF of access, and control little generating line L11 corresponds the L11 of the little generating line of control in the main line circuit of access, and control little generating line L31 corresponds the L31 end of the main line circuit control little generating line of access. After the system voltage is reduced, the contact acts (the voltage range can be adjusted according to specific conditions) after the undervoltage relay KV detects that the voltage is too low, so that the time relay HJ loses power, the contact of the start-stop loop time relay HJ is disconnected in a delayed mode (the delay time can be adjusted according to specific conditions), the coil of the main loop contactor KM loses power and is disconnected, and the motor M stops running.
Claims (1)
1. An undervoltage protection device is characterized in that an A end of a molded case circuit breaker QF is connected with a fuse FU1 in series and then connected with a 5 end of an undervoltage relay KV, a 7 end of the undervoltage relay KV is connected with a 6 end of the undervoltage relay KV, and a 8 end of the undervoltage relay KV is connected with a C end of the molded case circuit breaker QF; the control small bus L11 is connected in series with a fuse FU2 and then connected with the 3 end of an undervoltage relay KV, the 13 end of a button SB1 and the parallel end of the 13 end of a contactor KM, the 4 end of the undervoltage relay KV is connected with the 13 end of a time relay HJ, the 14 end of the button SB1 and the parallel end of the 14 end of the contactor KM are connected in series with a button SB2 and the 13 end of the contactor KM and then connected with the 14 end of the time relay HJ and the parallel end of the 14 end of the contactor KM are connected in series with a fuse FU3 and then connected with the control small bus L31.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020644724.0U CN212063480U (en) | 2020-04-26 | 2020-04-26 | Under-voltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020644724.0U CN212063480U (en) | 2020-04-26 | 2020-04-26 | Under-voltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212063480U true CN212063480U (en) | 2020-12-01 |
Family
ID=73517617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020644724.0U Active CN212063480U (en) | 2020-04-26 | 2020-04-26 | Under-voltage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212063480U (en) |
-
2020
- 2020-04-26 CN CN202020644724.0U patent/CN212063480U/en active Active
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