Automatic regulator for rated protection current of circuit breakers

Abstract

The embodiment of the invention discloses an automatic regulator for rated protection current of circuit breakers. The regulator comprises a sampling circuit, an analog-digital conversion device, a microcontroller and a signal output device; the sampling circuit comprises a resistor which is in series connection with an auxiliary contact switch and has preset resistance; the auxiliary contact switch activates the sampling circuit when a branch circuit breaker of a branch loop corresponding to the sampling circuit is closed, and deactivates the sampling circuit when the branch circuit breaker is disconnected; an analog current signal of the sampling circuit is transmitted to the analog-digital conversion device when the sampling circuit is activated; the analog-digital conversion device isused for converting an analog signal of the sampling circuit into a digital signal; the microcontroller is used for generating the digital signal into a control signal according to certain operation rules; and the signal output device is used for outputting the control signal in the form of digital control signal or analog control signal, thus being capable of completing automatic regulation of the rated protection current of a main circuit breaker of a major loop in real time.

Description

technical field [0001] The invention relates to the field of power distribution, in particular to an automatic regulator for rated protection current of a circuit breaker. Background technique [0002] In a power distribution system, a main circuit breaker in a main circuit and a branch circuit breaker in a branch circuit need to be provided in a circuit in many usage environments. Among them, the main circuit breaker is used as the main switch for turning on or breaking off the power supply, and at the same time it also plays the role of the main protection switch for various overloads or short-circuit faults. In the prior art, when the number of branch circuit breakers in the branch circuits subordinate to the main circuit breaker in the main circuit increases or decreases, or the rated protection current value of the subordinate branch circuit breakers changes, the The rated protection current value of the main circuit breaker needs to be manually calculated and adjusted...

AI Technical Summary

Problems solved by technology

[0003] In this way, when the branch circuit breakers in the circuit are changed frequently, after each change, the main circuit breaker needs to manually calculate the rated protection current value and then manually set the main circuit breaker, so the work intensity of the staff is reduced. bigger

[0004] Moreover, since the main circuit breaker in the main circuit in the prior art cannot perform real-time dynamic adjustment according to the capacity of the branch circuits

Therefore, the main circuit breaker in the main circuit cannot provide timely and effective protection for the branch circuit breakers of the branch circuit and the equipment on the branch circuit, so that the damage or failure of the equipment in the circuit due to overcurrent is relatively high.

Images