Risk assessment platform and method for single-phase earth fault step voltage of distribution network under layered soil

Abstract

The invention discloses a risk assessment platform and method for single-phase earth fault step voltage of a distribution network under layered soil. The upper end of an experiment box carries a linemodule; and the lower end of the experiment box carries a step voltage test module. A power-frequency power supply is connected with the line module through a three-phase outgoing line after connecting with a rectifier, an inverter and a transformer. The line module comprises an A phase line, a B phase line, a C phase line and a three-phase RLC load. The C phase line is provided with a broken linesimulator. The broken line simulator comprises current sensors, high-voltage switches, a current acquisition device, a switch action judgment device, a central processor and a wireless transceiver device and is used for simulating single-phase broken line ground fault of a power transmission line. The step voltage test module is used for measuring the step voltage under the layered soil. A data analysis module is responsible for operation and control and records relevant parameters. The system and method can effectively simulate the single-phase broken line ground fault of the distribution network under the horizontally stratified soil, and can carry out risk assessment on the step voltage.

Description

technical field [0001] The invention belongs to the field of grounding analysis of power systems, and in particular relates to a single-phase grounding fault step voltage risk assessment platform and method of a distribution network under layered soil. Background technique [0002] Single-phase ground faults account for a large part of the 10kV distribution network faults, and the probability of occurrence is high. When a single-phase ground fault occurs in the distribution network line, it is allowed to operate with a period of time. During this period, the vicinity of the ground point will be High potential and potential gradient will continue to exist, and when a person approaches the potential area, a potential difference will be generated between the two feet, causing step voltage electric shock accidents. The step voltage will cause great harm to the human body. In mild cases, the skin and organs will be burned and scars will be left. In serious cases, the excessive cu...

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Problems solved by technology

[0003] At present, relevant research on step voltage at home and abroad mainly focuses on the step voltage simulation and ground resistance test of the power plant and substation ground grid, as well as the risk assessment of the distribution network system operation and the risk assessment of the grid structure. Extreme Ground Step Voltage Testing and Risk Assessment Techniques

Due to the diversity of soil environment, the step voltage evaluation method will become more complicated

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