Small current ground fault online information monitoring and control method and device

Abstract

The invention discloses a small current grounding fault online information monitoring and controlling method and device. The monitoring and controlling method includes a grounding fault remote automatic monitoring and controlling method, a remote manual monitoring and controlling method and a GPRS (general packet radio service) module automatic restart method, the device comprises a monitoring and controlling device and a zero-sequence voltage and zero-sequence current monitoring and controlling device, the monitoring and controlling device is mounted on a remote monitoring and controlling center, the zero-sequence voltage and zero-sequence current monitoring and controlling device is mounted on a circuit and comprises an ADC (analog-to-digital converter) controller module, a timer module, an ARMCortex-M3 processor chip, a GPS (global positioning system) module, a WatchDog controller module, an external KB3030 GPRS module, a universal component and a GPRS switch control circuit, the universal component comprises external interfaces, and the GPRS switch control circuit comprises elements such as a relay. The method and the device solve the problems of data backlogging and low utilization efficiency of GPRS communication in the small current grounding fault online information monitoring and controlling process by the aid of wide-area monitoring technology.

Description

technical field [0001] The invention relates to the technical field of power system power distribution, in particular to a method and device for online information monitoring and control of single-phase grounding faults in a small current grounding system using wide-area measurement technology for monitoring and control in power distribution systems. Background technique [0002] At present, my country's power system distribution network is dominated by non-effective grounding methods, including non-grounding of the neutral point, grounding of the neutral point through the arc suppression coil, and high impedance grounding of the neutral point. Among them, the grounding method of the arc suppression coil accounts for The main part, in the distribution network system grounded by the arc suppression coil, due to the compensation effect of the arc suppression coil, the characteristic information of the zero-sequence current in the line is destroyed. In this case, it is necessary ...

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Problems solved by technology

[0003] The patent application number 201220012928.8 is "On-Line Location Method and System for Small Current Ground Fault Sections" and the patent application number is 201210027405.5 "Online Location Method for Small Current Ground Fault Zones and Segments". method, but the existing device sends zero-sequence voltage and zero-sequence current phasor information is one-way communication, poor controllability, and when a fault occurs, due to the backlog of data, GPRS communication is not smooth, garbled characters appear and the sensor circuit board is minimized The system crashes. In addition, due to the seasonal periodicity of the frequency of small current single-phase ground faults, a large amount of non-fault data occupies the communication channel, which increases the cost

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