CN219145010U - Circuit for preventing undervoltage protection misoperation of low-voltage frame type circuit breaker - Google Patents
Circuit for preventing undervoltage protection misoperation of low-voltage frame type circuit breaker Download PDFInfo
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- CN219145010U CN219145010U CN202223009015.3U CN202223009015U CN219145010U CN 219145010 U CN219145010 U CN 219145010U CN 202223009015 U CN202223009015 U CN 202223009015U CN 219145010 U CN219145010 U CN 219145010U
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Abstract
The utility model relates to the field of electrical protection of low-voltage frame circuit breakers, in particular to a circuit for preventing undervoltage protection misoperation of a low-voltage frame circuit breaker. The circuit for preventing undervoltage protection misoperation of the low-voltage frame-type circuit breaker comprises a microcomputer protection measurement and control device, wherein a working power supply terminal of the microcomputer protection measurement and control device is connected with an external direct current 220V power supply; the phase A of the three-phase power supply is connected with a first under-voltage relay coil through a first fuse, and the other end of the first under-voltage relay coil is connected with a three-phase power supply N; the C phase of the three-phase power supply is connected with a second under-voltage relay coil through a second fuse, and the other end of the second under-voltage relay coil is connected with a three-phase power supply N; the first normally open contact of the first under-voltage relay and the second normally open contact of the second under-voltage relay are connected in parallel to the digital input point of the microcomputer protection measurement and control device.
Description
Technical Field
The utility model relates to the field of electrical protection of low-voltage frame circuit breakers, in particular to a circuit for preventing undervoltage protection misoperation of a low-voltage frame circuit breaker.
Background
At present, a protection controller of a low-voltage frame type circuit breaker is in complete set configuration, the protection controller is an embedded special accessory, when the matched protection controller fails on the circuit breaker which operates for a long time, the accessory-free circuit breaker can be replaced or the whole set of circuit breaker can be replaced, the replacement cost is high and the time is too long, meanwhile, due to the fact that the undervoltage protection of the low-voltage alternating-current frame type circuit breaker adopts a mode of a single-phase power undervoltage release, when the undervoltage release coil is burnt down due to long-time electrified operation or the problem that the single-phase power control loop of the low-voltage circuit breaker has poor contact and the like, the undervoltage protection coil is released, so that undervoltage protection misoperation is caused, and a plurality of influences are brought to continuous production.
Disclosure of Invention
The utility model provides a circuit for preventing undervoltage protection misoperation of a low-voltage frame-type circuit breaker, and aims to solve the problem that a special protection module is required to be used when an embedded protection module is damaged when a frame-type low-voltage circuit breaker is used for protecting a controller.
The utility model is realized by the following technical scheme:
the circuit for preventing undervoltage protection misoperation of the low-voltage frame-type circuit breaker comprises a microcomputer protection measurement and control device, wherein a working power supply terminal of the microcomputer protection measurement and control device is connected with an external direct current 220V power supply; the device comprises a three-phase power supply, wherein the phase A of the three-phase power supply is connected with a first under-voltage relay coil through a first fuse, and the other end of the first under-voltage relay coil is connected with a three-phase power supply N; the C phase of the three-phase power supply is connected with a second under-voltage relay coil through a second fuse, and the other end of the second under-voltage relay coil is connected with a three-phase power supply N; the first normally open contact of the first under-voltage relay and the second normally open contact of the second under-voltage relay are connected in parallel to the digital input point of the microcomputer protection measurement and control device.
The three-phase current transformer comprises an ABC three-phase current transformer secondary winding, and the three-phase current transformer secondary winding is connected into a current measurement and control loop of the microcomputer protection measurement and control device in a star-shaped wiring mode.
The circuit breaker comprises a circuit breaker, a circuit breaker closing coil and a circuit breaker tripping coil; the frame type low-voltage circuit breaker is connected to a bus, a three-phase current transformer is further connected to the bus in series, a state signal of the circuit breaker is connected with a switching value acquisition board of the protection measurement and control device, a closing coil of the circuit breaker is connected to a digital value output point closing outlet of the microcomputer protection measurement and control device, and a tripping coil of the circuit breaker is connected to a digital value output point opening outlet of the microcomputer protection measurement and control device.
The microcomputer protection measurement and control device is internally provided with a tripping input point which is connected with the digital quantity input point of the microcomputer protection measurement and control device.
The overcurrent protection sampling signal of the microcomputer protection measurement and control device adopts a standard signal of 0-5A.
The utility model has the beneficial effects that:
1. the utility model monitors the two-phase voltage of the three-phase power supply through the two undervoltage relays respectively, and connects the normally open contacts of the two undervoltage relays in parallel and then accesses the digital input point of the microcomputer protection measurement and control device, thereby solving the problem that the protection module of the low-voltage frame circuit breaker is embedded and can not be replaced by using other through function protection modules, and simultaneously solving the problem of false tripping existing in the undervoltage tripping device of the original frame low-voltage circuit breaker.
2. According to the utility model, the original embedded protection module is externally separated from the low-voltage frame breaker and the protection module, meanwhile, the original embedded single-phase undervoltage tripping protection on the original low-voltage frame breaker is abandoned, two undervoltage relays are used for respectively detecting the voltage conditions of two phases of power supplies, and the problem of undervoltage protection misoperation can not occur when one undervoltage delay relay is released; therefore, the utility model solves the problem of universalization of the original embedded protection module on one hand, and solves the misoperation defect of the embedded under-voltage release through changing the scheme of the under-voltage circuit of the low-voltage frame breaker on the other hand.
3. The utility model discloses abandoned original undervoltage tripping type's undervoltage protection mode, but utilized two undervoltage protection relays to insert the two-phase in the three-phase power respectively to connect into microcomputer protection measurement and control device with its normally open contact in parallel, prevent that single undervoltage relay from damaging or single phase power contact is bad etc. from causing various drawbacks that undervoltage protection malfunction caused.
Drawings
FIG. 1 is a circuit diagram of the present utility model;
in the figure: 1. the circuit breaker comprises a frame type low-voltage circuit breaker, a three-phase current transformer, a first undervoltage relay, a second undervoltage relay, a 5.ABC three-phase current transformer secondary winding, a first normally open contact, a second normally open contact, a microcomputer protection measurement and control device, a circuit breaker closing coil, a circuit breaker opening coil, a first fuse and a second fuse.
Detailed Description
Referring to fig. 1, a circuit for preventing malfunction of undervoltage protection of a low-voltage frame type circuit breaker comprises a microcomputer protection measurement and control device, wherein a working power supply terminal of the microcomputer protection measurement and control device is connected with an external direct current 220V power supply; the high-voltage relay comprises a three-phase power supply, wherein the phase A of the three-phase power supply is connected with a coil of a first under-voltage relay 3 through a first fuse 11, and the other end of the coil of the first under-voltage relay 3 is connected with a three-phase power supply N; the C phase of the three-phase power supply is connected to a coil of a second under-voltage relay 4 through a second fuse 12, and the other end of the coil of the second under-voltage relay 4 is connected with a three-phase power supply N; the first normally open contact 6 of the first under-voltage relay 3 and the second normally open contact 7 of the second under-voltage relay 4 are connected in parallel to the digital input point of the microcomputer protection measurement and control device 8.
The three-phase current transformer comprises an ABC three-phase current transformer secondary winding 5, wherein the three-phase current transformer secondary winding is connected into a current measurement and control loop of a microcomputer protection measurement and control device 8 in a star connection mode, and signals of the ABC three-phase current transformer secondary winding are connected with the current loop of the microcomputer protection measurement and control device 8 to realize various overcurrent protection functions.
The circuit breaker comprises a frame type low-voltage circuit breaker 1, a circuit breaker closing coil 9 and a circuit breaker tripping coil 10; the frame-type low-voltage circuit breaker 1 is connected to a bus, the bus is further connected with a three-phase current transformer 2 in series, a state signal of the frame-type low-voltage circuit breaker 1 is connected with a switching value acquisition board of the protection measurement and control device 8, a circuit breaker closing coil 9 is connected to a digital value output point closing outlet of the microcomputer protection measurement and control device 8, and a circuit breaker tripping coil 10 is connected to a digital value output point opening outlet of the microcomputer protection measurement and control device 8 to achieve a protection effect on the microcomputer protection measurement and control device 8.
A tripping input point is arranged in the microcomputer protection measurement and control device 8 and is connected with a digital quantity input point of the microcomputer protection measurement and control device 8; thus, the control of the first undervoltage relay 3 and the second undervoltage relay 4 is realized.
The overcurrent protection sampling signal of the microcomputer protection measurement and control device 8 adopts a standard signal of 0-5A.
The secondary winding 5 of the three-phase current transformer is connected into a current measurement and control loop of the microcomputer protection measurement and control device 8 in a star-shaped wiring mode. The phase A of the three-phase power supply is connected with a first under-voltage relay 3 coil through a first fuse 11, and the other end of the first under-voltage relay 3 coil is connected with a three-phase power supply N; the C phase of the three-phase power supply is connected to a coil of a second under-voltage relay 4 through a second fuse 12, and the other end of the coil of the second under-voltage relay 4 is connected with a three-phase power supply N; the first under-voltage relay normally-open contact 6 and the second under-voltage relay normally-open contact 7 are connected in parallel to a digital input point of the microcomputer protection device 8; the breaker closing coil 9 is connected to a digital output point closing outlet of the microcomputer protection measurement and control device 8; the tripping coil 10 of the breaker is connected to the digital output point opening outlet of the microcomputer protection measurement and control device 8. The signal of the secondary winding 5 of the ABC three-phase current transformer is connected with a current acquisition loop of a microcomputer protection measurement and control device 8 to realize various overcurrent protection functions; the two-phase voltage of the three-phase power supply is monitored through the two undervoltage relays respectively, normally open contacts of the two undervoltage relays are connected in parallel and then connected to a digital input point of the microcomputer protection measurement and control device (the microcomputer protection measurement and control device is internally provided with a tripping input point), a state signal of the circuit breaker is connected with a switching value acquisition board of the protection device, a tripping coil of the circuit breaker is connected with a tripping outlet of the microcomputer protection device, and an external direct current 220V power supply is connected with a working power supply terminal of the microcomputer protection device. And re-accounting and inputting a protection fixed value to realize the protection function of the frame type low-voltage circuit breaker.
Claims (4)
1. The utility model provides a prevent circuit of undervoltage protection maloperation of low voltage frame-type circuit breaker, includes microcomputer protection measurement and control device, and microcomputer protection measurement and control device's work power supply terminal links to each other with external direct current 220V power, its characterized in that: the high-voltage relay comprises a three-phase power supply, wherein the phase A of the three-phase power supply is connected with a coil of a first under-voltage relay (3) through a first fuse (11), and the other end of the coil of the first under-voltage relay (3) is connected with a three-phase power supply N; the C phase of the three-phase power supply is connected to the coil of the second under-voltage relay (4) through the second fuse (12), and the other end of the coil of the second under-voltage relay (4) is connected with the three-phase power supply N; the first normally open contact (6) of the first under-voltage relay (3) and the second normally open contact (7) of the second under-voltage relay (4) are connected in parallel to the digital input point of the microcomputer protection measurement and control device (8).
2. The circuit for preventing undervoltage protection malfunction of a low voltage frame type circuit breaker according to claim 1, wherein: the three-phase current transformer comprises an ABC three-phase current transformer secondary winding (5), and the three-phase current transformer secondary winding is connected into a current measurement and control loop of a microcomputer protection measurement and control device (8) in a star-shaped wiring mode.
3. The circuit for preventing undervoltage protection malfunction of a low voltage frame type circuit breaker according to claim 1, wherein: the circuit breaker comprises a circuit breaker closing coil (9) and a circuit breaker tripping coil (10); the circuit breaker closing coil (9) is connected to a digital quantity output point closing outlet of the microcomputer protection measurement and control device (8), and the circuit breaker tripping coil (10) is connected to a digital quantity output point opening outlet of the microcomputer protection measurement and control device (8).
4. The circuit for preventing undervoltage protection malfunction of a low voltage frame type circuit breaker according to claim 1, wherein: the microcomputer protection measurement and control device (8) is internally provided with a tripping input point which is connected with a digital quantity input point of the microcomputer protection measurement and control device (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223009015.3U CN219145010U (en) | 2022-11-12 | 2022-11-12 | Circuit for preventing undervoltage protection misoperation of low-voltage frame type circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223009015.3U CN219145010U (en) | 2022-11-12 | 2022-11-12 | Circuit for preventing undervoltage protection misoperation of low-voltage frame type circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219145010U true CN219145010U (en) | 2023-06-06 |
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ID=86593132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223009015.3U Active CN219145010U (en) | 2022-11-12 | 2022-11-12 | Circuit for preventing undervoltage protection misoperation of low-voltage frame type circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219145010U (en) |
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2022
- 2022-11-12 CN CN202223009015.3U patent/CN219145010U/en active Active
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