Personal safety assessment system and method for single-phase line short-connected towers considering soil stratification

Abstract

The invention discloses a single-phase line short-circuited pole and tower personal safety assessment system and method with soil stratification being considered. The system comprises a power module,a line module, a step voltage test module, an experiment box and a data analysis module. A power-frequency power supply is connected to the line module through a three-phase outgoing line. Three phases of lines are connected with a three-phase RLC load through line resistors, a broken line simulator and a load transformer. The broken line simulator is formed by 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 short-circuited pole and tower fault of a power transmission line. The step voltage test module is used for measuring the step voltage under the layered soil. The data analysis module is responsible for operation and control ofthe other modules and records relevant parameters. The system and method can effectively simulate the single-phase broken line short-circuited pole and tower fault of the power transmission line under the horizontally stratified soil, and can effectively evaluate the step voltage to achieve a purpose of assessment of personal safety.

Description

technical field [0001] The invention belongs to the field of power system grounding analysis, in particular to a single-phase line short-connected tower personal safety evaluation system and method considering soil stratification. Background technique [0002] Due to various meteorological disasters, conductor overload and external force damage, etc., line disconnection faults will occur frequently, especially single-phase disconnection faults are more likely to occur. When the tower is connected, due to the existence of the grounding grid of the tower, it will cause a short circuit of the transmission line and reduce the stability and reliability of the power system. The main function of the transmission line tower grounding device is to effectively drain the fault current into the earth. Due to the large fault current amplitude, disconnection faults are often accompanied by ground faults to form complex faults, which can easily lead to fire and electric shock hazards for ...

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Problems solved by technology

[0003] At present, the relevant research on step voltage at home and abroad mainly focuses on the step voltage simulation and ground resistance test research of the substation grounding grid, as well as the risk assessment of the distribution network system operation and the risk assessment of the grid structure. Power grid extreme ground step voltage test and risk assessment technology

When the single-phase short circuit of the transmission line is directly connected to the tower, the power frequency overvoltage generated will make the step voltage evaluation method more complicated. Therefore, in order to accurately test the step voltage, it is urgent to establish an intelligent safety evaluation system. It can take into account the impact of soil level stratification and short-circuit towers after a single-phase line disconnection fault, to measure the step voltage in the soil area around the power transmission and distribution system, and to conduct an effective safety assessment of its risk

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