Biosafety assessment platform and method for shorting towers with single-phase disconnection in transmission lines

Abstract

The invention discloses a bio-safety evaluation platform and method for an electric transmission line single-phase disconnection short circuit pole and tower. A power module comprises a fundamental frequency power supply, a rectifier, an inverter and a transformer which are connected in sequence; an experimental box comprises a circuit module mounted at the upper end and a step voltage test modulemounted at the lower end; the step voltage test module comprises a simulation ground, a voltage measurement robot, the pole and tower and a grounding device. An electric transmission line single-phase disconnection short circuit pole and tower fault is simulated, current of each part of an earth screen of the experimental pole and tower is measured, step voltage values of different positions aremeasured, then a Gaussian error coefficient optimal value of earth pole contact resistance is obtained by using a particle swarm optimization method, and finally, security testing evaluation is carried out on the peripheral region of a fault point. The bio-safety evaluation platform and method for the electric transmission line single-phase disconnection short circuit pole and tower have the advantages that fault inversion can be carried out for the situation of the electric transmission line single-phase disconnection short circuit pole and tower, testing evaluation of a dangerous zone is carried out on the step voltage of the peripheral region of the fault point, and a solid foundation is provided for formulating relevant safety warning and insulation protection measure opinions.

Description

technical field [0001] The invention belongs to the field of electric power system grounding, in particular to a biosafety evaluation platform and method for transmission line single-phase disconnection short-circuited towers. Background technique [0002] The extreme grounding fault of the transmission line is the main problem affecting the safe operation of the power system. The tripping accidents of the transmission and distribution network occur frequently. Usually, when the transmission line is disconnected and shorted to the tower, the fault current will flow to the ground through the tower and the grounding device, and the fault current will It poses a great threat to the biological safety around the tower. When the living beings approach 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 body. In mild cases, the skin and organs will...

AI Technical Summary

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 transmission and distribution network system operation and the risk assessment of the grid structure. Line extreme ground step voltage testing and risk assessment techniques

When a single-phase disconnection short-connected tower fault occurs on the transmission line, the step voltage evaluation method will become more complicated. In order to accurately evaluate the step voltage under the fault, it is urgent to establish an intelligent evaluation platform that can consider power transmission. The impact of the overvoltage caused by line disconnection flowing through the tower, the risk of step voltage in the surrounding soil area, and safety assessment

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