Multifunctional self-recovery over-voltage and under-voltage protector

Abstract

Provided is a multifunctional self-recovery over-voltage and under-voltage protector. A main circuit is divided into a power supply end of the main circuit and a load end of the main circuit due to the fact that a normally-open contact of a self-hold relay is in serial connection with the middle portion of the main circuit, the on-off state of the self-hold relay is completely controlled through a main control circuit, and the sampling end of an over-voltage protection circuit and the sampling end of an under-voltage protection circuit are connected with the output end of a transformation and rectification filter circuit of a power supply of the main circuit; the sampling end of an over-current protection circuit, the sampling end of a short-circuit protection circuit and the sampling end of an earth leakage protection circuit are connected with the load end of the main circuit, and the output ends of the four protection circuits are connected with the main control circuit; the two ends of a self-checking circuit are connected with the load end and the power supply end of the main circuit in a crossing mode. The multifunctional self-recovery over-voltage and under-voltage protector is high in integration degree, comprehensive in protection function, easy to install, convenient to use and high in cost performance, and saves energy and electricity.

Description

technical field [0001] The invention relates to an electrical appliance for power distribution protection of electric terminal users, in particular to a multifunctional self-resetting overvoltage and undervoltage protector. Background technique [0002] The distribution boxes of the existing electrical end users are protected by an air switch or a leakage protector against the short circuit and leakage faults of the total circuit, and then a self-resetting overvoltage and undervoltage protector is used to protect the overvoltage and undervoltage of the total circuit. Voltage fault protection, such two products are used at the same time, not only the cost is high, the volume is large, the installation is also labor-intensive, and the protection accuracy of the air switch or leakage protector for over-current faults is very low, which is easy to cause electrical safety. Accidents, self-resetting over-voltage and under-voltage protectors use ordinary high-power relays to contro...

AI Technical Summary

Problems solved by technology

[0002] The distribution boxes of the existing electrical end users are protected by an air switch or a leakage protector against the short circuit and leakage faults of the total circuit, and then a self-resetting overvoltage and undervoltage protector is used to protect the overvoltage and undervoltage of the total circuit. Voltage fault protection, such two products are used at the same time, not only the cost is high, the volume is large, the installation is also labor-intensive, and the protection accuracy of the air switch or leakage protector for over-current faults is very low, which is easy to cause electrical safety. Accidents, self-resetting over-voltage and under-voltage protectors use ordinary high-power relays to control the on-off of the main circuit, and ordinary high-power relays rely on electric energy to maintain conduction, and long-term power-on is not conducive to energy saving

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