Risk assessment platform and method for single-phase disconnection connection tower under lightning strike considering soil stratification

Abstract

The invention discloses a risk assessment platform and method for a single-phase broken line short-circuited pole and tower under lightning stroke and with soil stratification being considered. The upper end of an experiment box is mounted by a line module; and the lower end of the experiment box is mounted by a step voltage test module. The lower end surface of the experiment box is opened. An impulse voltage source is connected with the line module through a three-phase outgoing wire. 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 ground fault of a single-phase broken line short-circuited pole and tower 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 of the other modules and records relevant parameters. The risk assessment platform and method can effectively simulate overvoltage and the ground fault of the single-phase broken line short-circuited pole and tower caused by lightning strike on the transmission line under the horizontallystratified soil, and can effectively evaluate the step voltage.

Description

technical field [0001] The invention belongs to the field of electric power system grounding, in particular to a risk assessment platform and method for a single-phase disconnected connection tower under lightning strikes and considering soil stratification. Background technique [0002] The lightning strike transmission line fault is the main problem affecting the safe transportation of the power system. The transmission and distribution network tripping accidents caused by lightning strikes occur frequently. Usually, when the lightning strikes the transmission line, the lightning current will flow to the ground through the tower. This kind of high amplitude and high frequency The fault current will pose a great threat to the biological safety around the tower. When the organism approaches the potential area, a potential difference will be generated between the two feet, resulting in a step voltage electric shock accident. The step voltage will cause great harm to the human...

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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

When the transmission line is directly struck by lightning, the step voltage evaluation method will become more complicated. In order to accurately evaluate the step voltage under lightning strike, it is urgent to establish an intelligent evaluation platform that can consider soil stratification and lightning strike transmission. The impact of the overvoltage generated by the line flowing through the tower, the risk of step voltage in the surrounding soil area, and safety assessment

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