Combined residual voltage detection protection device

Abstract

The invention relates to the field of power line protection, in particular to a combined residual voltage detection protection device which comprises a residual voltage detection circuit, a voltage and current analog quantity acquisition circuit, a key module, a power module, a microprocessor module, a display screen module, a network communication interface module, a storage module, a remote signaling input interface and a control output interface. The residual voltage detection circuit is connected with the microprocessor module I / O, a control output interface is connected with a processor output port, and the voltage and current sensor analog quantity acquisition circuit is connected with the microprocessor module AD circuit; the output end of the key module is connected with the input end I / O of the microprocessor module; the output end of the power module is connected with a corresponding power port of the microprocessor module; the input end of the display screen module is connected with the output end I / O of the microprocessor module. According to the device, the power grid recombination self-healing efficiency is effectively improved, the network recombination time of the power grid is shortened, and the power supply reliability of the power grid is greatly enhanced.

Description

technical field [0001] The invention relates to the field of power line protection, in particular to a combined residual voltage detection and protection device. Background technique [0002] With the country's continuous investment and development of smart grids, the requirements for the self-healing function of smart grids are getting higher and higher. How to reduce the number of actions in the process of reorganizing the grid after a grid accident and achieve the fastest self-healing time to effectively improve the reliability of power supply , The need to improve the quality of power supply is more urgent. The effective judgment of the residual voltage in the process of reorganizing the network can shorten the reorganization time by half, but the residual voltage time is short, and it takes time for the general protection device to restart in the event of power failure. Especially now, in order to realize the maintenance-free life of the protection device, The backup p...

AI Technical Summary

Problems solved by technology

The effective judgment of the residual voltage in the process of reorganizing the network can shorten the reorganization time by half, but the residual voltage time is short, and it takes time for the general protection device to restart in the event of power failure. Especially now, in order to realize the maintenance-free life of the protection device, The backup power supply uses supercapacitors, but compared with batteries, supercapacitors have the advantages of long life and high instantaneous output power, but the power density is relatively small, and the maintenance time of backup power supply is short without external power supply, and power is often lost during the reorganization process. At this time, it is difficult to effectively judge the residual pressure. Often the residual pressure exceeds the control device and the control device is not activated, thus losing the residual pressure judgment.

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