Electricity leakage-prevention and overcurrent protection device

Abstract

The invention relates to an electricity leakage-prevention and overcurrent protection device. The device comprises a power source input unit A, an output control execution unit Z, an electricity leakage detection unit K and an overcurrent detection unit M which are respectively connected in series with the electricity leakage detection units C1-Cn, the overcurrent detection units D1-Dn and the output control execution units H1-Hn of each branch circuit, wherein the electricity leakage detection units C1-Cn, the overcurrent detection units D1-Dn and the output control execution units H1-Hn of each branch circuit are connected in parallel; a DC power source unit E is respectively connected with an earth detection unit B and a microcontrol unit F; and the microcontrol unit F is respectively connected with the earth detection unit B, the electricity leakage detection units C1-Cn, the overcurrent detection units D1-Dn, the output control execution units H1-Hn, the output control execution unit Z, the electricity leakage detection unit K and the overcurrent detection unit M.

Description

technical field [0001] The invention relates to an anti-leakage and overcurrent protection device. Background technique [0002] CN93247465.9 announced a "power universal protector", its purpose is to provide a small number of components on the basis of the original series leakage protector, improve the circuit and structure of the original leakage protector, improve its performance, increase protection Range, anti-leakage, anti-electric shock, anti-overvoltage, anti-overcurrent, anti-lightning, anti-short circuit universal protector. Its technical solution: the power supply of the universal power protector first passes through the over-rated current thermal protector (RJ) to perform over-current protection, and an appropriate lightning protection varistor is connected in parallel to the detection circuit of the original leakage protector (RV) and the discharger (G) connected to the ground discharge in the protected power line, in order to protect itself, a suitable current...

AI Technical Summary

Problems solved by technology

[0005] (1) It is impossible to detect the connection state of the ground wire. As we all know, the leakage current can only be reflected in the leakage circuit. Only when the ground wire exists or other conductors are used as the ground connection, the leakage current can be displayed. Possibility to implement earth leakage protection

[0006] (2) All the leakage switches are used as the main switch. Once the leakage is detected, the switch will trip first and cut off the power supply, thereby disconnecting the power supply of other branches, which will affect the normal power consumption of other branches and give Inconvenience caused by power consumption of other branches

It is not suitable to design the controllable switch of the action time, it is more difficult to meet the branch action, and the main switch lags behind the judgment and action

[0008] (4) There is also a time relay to delay time, but its operation is inconvenient, and it is more difficult for users to grasp

[0010] (1). When the grounding wire is not connected or the grounding connection fails, even if there is leakage in the branch circuit, the leakage switch may not trip. At this time, only when the human body or other conductors are grounded as conductive equipment, the leakage switch can trip normally. There is a certain detection and action time for tripping. At this time, if the human body is used as a conductor, it will cause certain damage to the human body.

[0011] (2). The leakage switch is used as the main switch, and then connected to each branch, but once a leakage occurs in a branch, the leakage switch will trip, and all power will be cut off at this time, affecting other branches. Normal power supply, if it is at night, you have to use other forms of power supply as lighting to eliminate this problem, if it is in the office area, it will affect the safe use of electricity in other branches

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