A combined residual voltage detection and protection device

Abstract

The invention relates to the field of power line protection, in particular to a combined residual voltage detection and protection device, comprising a residual voltage detection circuit, a voltage and current analog quantity acquisition circuit, a button module, a power supply module, a microprocessor module, a display screen module, a network Communication interface module, storage module, remote signal input interface, control output interface; the residual voltage detection circuit is connected with the I / O of the microprocessor module, the control output interface is connected with the processor output port, the voltage and current sensor analog quantity acquisition circuit is connected with the microprocessor The AD circuit of the controller module is connected; the output end of the button module is connected with the input end I / O of the microprocessor module; the output end of the power module is connected with the 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. O connection. The device of the invention effectively improves the self-healing efficiency of the grid reorganization, reduces the grid network reorganization time, and greatly enhances the power supply reliability performance of the grid.

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 continuous investment and development of the smart grid, the requirements for the self-healing function of the smart grid are getting higher and higher. How to reduce the number of actions in the process of reorganizing the grid after a grid accident, achieve the fastest self-healing time, and effectively improve the reliability of power supply , The need to improve the quality of power supply is more urgent. The effective judgment of residual voltage in the process of grid reorganization can shorten the reorganization time by half, but the residual voltage time is short. Generally, it takes time for the protection device to restart in the event of a power failure. The backup power supply adopts super capacitor, but the super capacitor has the advantages of long life and large...

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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