External-type power distribution network leakage indicating device

Abstract

The invention discloses an external-type power distribution network leakage indicating device which comprises a buckle-type housing, an open-close-type residual current transformer, a leakage current monitoring and comparison circuit, a leakage indicator sign, a power supply and a charging portion. The leakage current monitoring and comparison circuit comprises a signal pick-up circuit, a current amplifier circuit and a reference voltage comparison circuit. The open-close-type residual current transformer detects the magnitude of the current; through the application of a signal conditioning unit formed by an amplifier, a voltage signal which can be received by a comparator unit and is in proportion to the leakage current at the primary side of the residual current transformer is obtained; the signal and a reference voltage (setting voltage) are compared through the comparator, and then, a leakage signal is output to an indicating part; after receiving the leakage signal, the indicating part gives out an obvious sign and turns off the power supply of the device; and after receiving a reset indicating indication, the device goes back to work again. Different from other leakage protectors, the device adopts the external-type open-close-type residual current transformer to collect the electric leakage signal, and convenient mounting and dismounting can be achieved, and meanwhile, the device is allowed to be separated from a high-voltage portion, thereby improving reliability of the device. Compared with a conventional leakage protection device, the device is wider in application range, higher in safety factor and plays an early warning function on electric leakage danger states.

Description

technical field [0001] The invention belongs to the field of electric leakage detection, and in particular relates to an external electric leakage indicating device, which is used for the electric leakage indication of 220V / 380V power line distribution network, can be conveniently installed on the electric power line, and can give Indicating mark of excessive leakage current. technical background [0002] Since humans use electricity, electricity has brought a lot of convenience to humans, but it has also brought disasters to humans. It could burn out electrical appliances, cause a fire, or give people an electric shock. While all kinds of electrical appliances come one after another, all kinds of protectors are also born. One of them is specially designed to protect people, called leakage protector. Leakage protector, commonly known as leakage switch, is used to prevent personal electric shock when the circuit or electrical insulation is damaged and short-circuited to t...

AI Technical Summary

Problems solved by technology

[0005](1) The leakage current action protector installed at the user end of the existing distribution network, due to the setting error of the protector, aging, deterioration of the working environment, incomplete protection at the end and Due to reasons such as early stage and relatively backward design, the terminal protection frequently operates, and the user cannot use electricity normally, so the terminal protection is released privately.

[0006](2) The leakage current action protector installed at the user end of the existing distribution network is usually installed indoors and managed by the user. The behavior of power consumption management personnel cannot carry out effective supervision and management

[0007](3) Existing leakage current-operated protectors are usually installed indoors or in meter boxes, and the power management personnel of the distribution network cannot check the status of the protector at a glance Find the location of leakage accurately, and then quickly isolate and eliminate the faults in the distribution network area, which brings troubles to the safety and reliability of power supply

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