Low-voltage intelligent circuit breaker

Abstract

The invention discloses a low-voltage intelligent circuit breaker which comprises a shell; the shell comprises a left end closure, a right end closure and at least one standard middle module which are connected into a whole body by rivets / screws; a main circuit board and a control circuit board are arranged in the inner chamber of the shell; an electric current mutual inductor, a voltage mutual inductor and a zero sequence mutual inductor, a temperature sensor, an energy-storage capacitor, an electromagnetic switch and a Hall sensor are arranged on the main circuit board, wherein the Hall sensor is arranged on the electromagnetic switch; a MCU (microprogrammed control unit) processor and a communication socket are arranged on the control circuit board; an operating button and a red and a green indicator lights are arranged at the obverse side of the shell; power input / output binding posts are respectively embedded in the middle parts of the upper side surface and the lower side surface of the shell; and standard communication sockets, which are connected with the control circuit board, are respectively fixed on the left end closure and the right end closure. The low-voltage intelligent circuit breaker has the advantages of small volume, compact structure, reliability for fixation, standardized and modular design, and convenience for use and install and the complete intellectualization of digital protection, automatic control and communication functions are really implementated.

Description

technical field [0001] The invention relates to a switch device for intelligently controlling the on and off of a low-voltage power supply, in particular to a low-voltage switch device with digital protection, automatic control and communication functions, belonging to the field of low-voltage electrical equipment. Background technique [0002] At present, our country has proposed the concept of developing an intelligent grid, which also includes the intelligence of the low-voltage grid, and the most important part of the intelligence of the low-voltage grid is the intelligence of the low-voltage circuit breaker. The intelligent low-voltage circuit breaker must have digital protection, automatic control and communication functions. At present, our country is moving in this direction. Major professional low-voltage electrical appliance manufacturers and scientific research institutes have done a lot of innovative work, such as Chint's NB7 series electrical appliances, Shangdi...

AI Technical Summary

Problems solved by technology

[0004] 1. The protection is single, the circuit breaker only has current protection, if you want to add other protection functions, you must add a special protection unit

[0005] 2. The protection method is electromagnetic, the protection accuracy is not high, it is not sensitive, and it is impossible to realize the free setting of the protection fixed value, and the free setting of the protection input and withdrawal

[0006] 3. The circuit breaker is abnormal or tripped, and the alarm information such as sound, light, and text cannot be issued in time

[0007] 4. There is no reliable communication function, and it cannot be self-organized and online monitoring

[0008] 5. The control method is on-site, and the on-off circuit breaker can only be manually controlled on site. It does not have remote or remote control functions, and the control method is mechanical.

[0009] 6. The circuit breaker is fixed in a two-dimensional way, which is not easy to fix and regular, and it is easy to loosen and deform after installation

[0010] 7. The tripping speed is fixed, and the tripping speed can not be set freely according to the magnitude of the fault current

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