Self-resetting overvoltage and undervoltage protector

Abstract

The invention discloses a self-resetting overvoltage and undervoltage protector. The key point of the technical solution is that the fixed contact and the spring tongue contact of the contact part are controlled to be attracted or separated by an adjustment mechanism, and the spring tongue contact is installed close to the moving contact. One side of the seat is hinged with a rotating shaft, which is fixed at the inner bottom of the housing, and the rotating shaft is provided with a torsion elastic member for tilting the spring tongue contact, and the other end of the spring tongue contact extends below the fixed contact. The elastic tongue contact has a large enough final contact pressure under the force of the torsion elastic member. When the overpressure state occurs during use, the distance between the elastic tongue contact and the fixed contact is relatively large, and the external circuit applies The voltage strength between the elastic tongue contact and the fixed contact cannot break down the air between them, so it is not easy to generate an arc, and the natural contact part will not be welded or ablated to make the elastic tongue touch The head and the fixed contact are melted and bonded, so as to avoid the failure of the protector or the explosion caused by the small opening distance and insufficient final pressure of the contact.

Description

technical field [0001] The invention relates to the technical field of electrical switches, more specifically, it relates to a self-resetting overvoltage and undervoltage protector. Background technique [0002] The control circuit of the self-resetting overvoltage and undervoltage protector adopts a high-speed micro-low power consumption processor as the core, a magnetic latching relay as the main circuit, and a modular standard design. Delay reset function after normal voltage. It is mainly used for the protection of the incoming line of the residential household box or the protection of the distribution line of the single-phase electrical equipment. Its installation method is the same as that of the miniature circuit breaker, and the wiring method and side shape are also similar to the miniature circuit breaker. When overvoltage or undervoltage occurs on the power supply line, the protector can quickly and safely cut off the circuit under continuous high-voltage impact,...

AI Technical Summary

Problems solved by technology

[0003] The self-resetting overvoltage and undervoltage protector includes a shell, a circuit part, and a contact device. The contact device includes a contact part and an adjustment mechanism for controlling the contact part to be pulled in or separated. The existing contact devices are all used The magnetic latching relay is used to realize the connection and disconnection of the contacts. The magnetic latching relay is used to pull in or separate the two contacts through the magnet to realize the circuit control function. Due to the limited magnetic force of the magnet, the contact part cannot be operated. If the opening distance of the relay is large enough, automatic reset cannot be realized if the opening distance of the relay is large. Therefore, when the main circuit is disconnected by overvoltage, the two contacts are in a micro-break state. The distance between the contacts is small, so the open circuit voltage between the two contacts will be relatively large in the overvoltage state, so it is very easy to break down the air between the two contacts, resulting in the generation of arc, while the traditional The magnetic latching relay uses the magnetic force of the permanent magnet to provide the final pressure, so it is prone to the problem of insufficient final pressure of the contact. However, in the normal use process, the insufficient final pressure of the contact will cause the problem of violent vibration of the contact. Due to the shaking of the contacts, the circuit of the contacts will be disconnected multiple times, which will lead to the generation of arcs (that is, the problem of pulling arcs between the contacts), and the contacts will melt under the action of the arcs. Adhesion, the two contacts are turned on for a long time, and the failure of the protector makes the equipment in the state of overload operation for a long time, resulting in damage to the equipment. At the same time, it is also very easy for the main circuit part of the protector to explode due to the high temperature of the arc, and then cause a fire. question

In order to be able to withstand the withstand current without causing the failure of the electrical control device or the explosion caused by the small opening distance and insufficient contact end pressure, the opening distance of the contact part needs to be greater than the safety index, so the traditional magnetic latching relay cannot achieve this. Effect

[0004] At the same time, although the existing circuit part of the self-resetting overvoltage and undervoltage protector has a disclosed detection circuit, the detection circuit is used to detect whether the voltage is undervoltage, thereby controlling the contact device to be in a tripping state or a closed state, but in the prior art The self-resetting over-voltage and under-voltage protector cannot directly display the voltage value, which is not convenient for human-computer interaction, and there is no detection button on the housing, which is not convenient for detecting whether the self-resetting over-voltage and under-voltage protector is in a normal working state

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