Power supply line fault detection method based on comparison method

Abstract

The invention provides a power supply line fault detection method based on a comparison method, the wire inlet end of each terminal power distribution cabinet is connected with a detection unit, and the detection unit comprises an alarm element and a contactor with a coil and a spring; during normal power supply, the coil is electrified to enable the contactor to act, the wire outlet end of a terminal power distribution cabinet is electrified, and the alarm element is in a short-circuit state; when a power failure occurs, the alarm element is connected with the contact of the contactor under the action of the spring, so that the alarm element is connected in series with each resident line at the outgoing line end of the terminal power distribution cabinet; when power failure detection is carried out, a low-voltage test power supply is connected between the zero line and the live line of a main power supply line, at the moment, the contactor does not act, the alarm element is powered on to give an alarm, and the alarm characteristic sent by the alarm element corresponding to the air switch which cannot trip is stronger than the alarm characteristics sent by other alarm elements. By comparing the alarm characteristics sent by the alarm element, the air switch with a problem can be quickly found, and the power supply recovery time is greatly shortened.

Description

technical field [0001] The invention relates to the field of power supply, in particular to a power supply line fault detection method based on a comparison method. Background technique [0002] In community power supply, one main power supply line usually supplies power to multiple residential buildings, and each residential building has multiple units, and a terminal power distribution cabinet is installed in the door opening of each unit, and a terminal power distribution cabinet is installed in the terminal power distribution cabinet. There is a main air switch, and several lines are separated from the main air switch to supply power to residents on different floors. In this way, the usage of the main power supply cables can be reduced, and the laying of the main power supply cables is also facilitated. [0003] Most of the power supply failures in the community are caused by short-circuits of household electrical appliances or lines. A small number of power supply fail...

AI Technical Summary

Problems solved by technology

Although every household has an air switch, the air switch is also damaged and does not work, especially when the main air switch in the terminal distribution cabinet cannot trip for protection. A short circuit in any household will cause the main control cabinet to trip. , so that all the residential buildings on the same road are powered off

The current troubleshooting problem is that before the source of the short circuit is found and eliminated, the power supply of most households can only be restored by finding and replacing the damaged air switch, and the damaged air switch is not easy to find, which seriously affects the recovery of power supply in the community time, has brought great inconvenience to the lives of the residents

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