Rural power grid three-level protection residual current fault rapid positioning device and positioning method

Abstract

The invention discloses a rural power grid three-level protection aftercurrent failure rapid positioning device and method. The rural power grid three-level protection aftercurrent failure rapid positioning device comprises an electric supply system, a microcontroller, a ZigBee communication module, a super capacitor and a boosting device. The electric supply system, the super capacitor, the boosting device, the microcontroller and the ZigBee communication module are sequentially connected, a current transformer is arranged between the electric supply system and the microcontroller, the current transformer regulates detected aftercurrents and then conducts digital-analogue conversion, and then the aftercurrents are online read in a circulating mode through the microcontroller. The microcontroller online detects the magnitude of the aftercurrents in a circulating mode and transmits detected current information to the ZigBee communication module. By the adoption of the device and method, rural power grid user aftercurrent information can be accurately detected, information is effectively transmitted through a ZigBee network, eventually information is sent to a power control center on a main node, central positioning aftercurrent failure points can be conveniently controlled, and a reference is provided for following maintenance operation.

Description

technical field [0001] The invention relates to the field of detection of rural power grids, in particular to a fast positioning device and a positioning method for residual current faults of three-level protection of rural power grids. Background technique [0002] In today's rural power grids, there are often residual currents, that is, the currents on the live wires entering the house and the neutral wires leaving the house are inconsistent, and part of the current is transmitted to the ground through other conductors. This may be caused by electrical leakage through the ground wire Leading the residual current into the ground may also cause electric shock to people. This hidden danger will pose a great threat to the personal and property safety of residents. Now rural residents are equipped with residual current operated circuit breakers. Once excess residual current is detected, the main power switch will trip to avoid the danger of leakage. However, the power supply ...

AI Technical Summary

Problems solved by technology

Wired transmission uses the power grid as the carrier and carries high-frequency signals containing residual current information. Its advantage is that it is easy to use and does not need to build additional transmission lines, but its modulation and demodulation process is complicated, and it cannot be used in the event of a power failure.

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