An experimental platform and method for risk assessment of single-phase disconnection and grounding faults of transmission lines

Abstract

The invention discloses a single-phase broken line ground fault risk assessment experiment platform and method for a power transmission line. The experiment platform comprises a power module, a line module, a step voltage test module, an experiment box and a data analysis module. The power module comprises a power frequency power supply, a rectifier, an inverter and a transformer. The upper end ofthe experiment box is provided with the line module; and the lower end is provided with the step voltage test module. The step voltage test module comprises a simulated ground and a voltage measuringrobot. The simulated ground is in close contact with a ground conductor of a broken line simulator. The single-phase broken line ground fault risk assessment experiment platform and method can carryout effective simulation and relevant fault inversion on single-phase broken line ground fault of the power transmission line, and can assess the danger level of the step voltage in the area around afault point, thereby facilitating formulation and optimization of relevant safety warning and insulation protection measures for the power transmission lines.

Description

technical field [0001] The invention belongs to the field of electric power system grounding, in particular to an experimental platform and method for risk assessment of single-phase disconnection grounding faults of transmission lines. Background technique [0002] The disconnection and grounding of transmission lines is one of the main problems affecting the safe and stable operation of power systems, and single-phase grounding faults are the most common faults in transmission lines. In the area near the single-phase disconnection grounding, the high-amplitude voltage will pose a great threat to the safety of surrounding organisms. When the organism enters the potential area, a potential difference will be generated between the two feet and cause a step voltage electric shock accident. Step voltage will cause greater harm to the human body, ranging from burns to the skin, organs, etc., leaving scars, and causing shock, coma, and even life-threatening. Nowadays, due to the...

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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 transmission and distribution network system operation and the risk assessment of the grid structure. Effective testing and risk assessment technology of line extreme grounding step voltage. In order to accurately and effectively evaluate single-phase disconnection and grounding faults of transmission lines, it is urgent to establish an intelligent evaluation platform that can accurately and efficiently test single-phase disconnection and grounding in surrounding areas. Step voltage distribution, effectively evaluate the step voltage risk in the surrounding soil area, and conduct safety assessment

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