Fireproof intelligent circuit breaker for dynamic detection, static detection and zero cutoff

Abstract

The invention relates to a fireproof intelligent circuit breaker for dynamic detection, static detection and zero cutoff, which is formed by electrically connecting an air circuit breaker connected in a three-phase load circuit and an intelligent control protection circuit, wherein the signal sampling end of the intelligent control protection circuit is connected to the three-phase load circuit, and the output end of the intelligent control protection circuit is connected to a tripping coil of the air circuit breaker through a microcomputer main control unit circuit; and the intelligent control protection circuit comprises a three-phase high-current split phase zero passage cutoff circuit, an inter-phase dynamic-static impedance detection and short-circuit protection circuit, a zero phase dynamic-static impedance detection and short-circuit protection circuit and a phase-ground dynamic-static impedance detection and leakage protection circuit. The fireproof intelligent circuit breaker solves the problem of three-phase high-current split phase zero passage cutoff, solves the problem of running dynamic impedance detection and protection problem of distribution and supply power grids, and eliminates the hidden danger of short circuit and electric leakage of the load end when a switch is not switched on.

Description

Technical field [0001] The invention relates to a new type of intelligent circuit breaker that connects strong and weak currents, and has monitoring and protection functions such as dynamic detection, static detection, and large current phase-separated zero-crossing cutoff. Background technique [0002] Existing circuit breakers have almost no intelligent control because of the technical difficulties of connecting high voltage and low voltage, high frequency and low frequency, and AC and DC. Therefore, the intelligent control of electrical products is still relatively backward. It only uses isolated sampling to detect parameters. Short-circuit and over-current use thermoelectric protection, and the cut-off speed is slow (≥150ms), which cannot meet the user's safe electricity requirements. [0003] The invention patent application "Intelligent Security Electric Control Device" with publication number 101499642 has performed switch isolation treatment for the pre-inspection of unclos...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects in the above-mentioned prior art, the present invention aims to provide a dynamic and static zero-cut fireproof intelligent circuit breaker, which adopts a three-phase high-power solid-state relay connected in parallel with the main circuit breaker to solve the problem of three-phase high-current split-phase zero-crossing. The technical problem of cutting off; at the same time, it solves the problem of dynamic impedance detection of the distribution power supply after the circuit breaker is put into operation, so that the detection results are consistent with the static (circuit breaker is not in operation) detection results, and complete the high-voltage and low-voltage, high-frequency and low-frequency, AC and DC connection; eliminates the hidden danger of short circuit and leakage at the load end when the switch is not closed

Images