A Calculation Method for Maximum Contact Voltage in Gas Insulated Substation
A technology of gas insulation and contact voltage, which is applied in the direction of AC/DC potential difference measurement devices, etc., can solve the problems of inaccurate calculation methods, achieve the effects of improving calculation accuracy, reducing economic losses, and high accuracy
Active Publication Date: 2018-03-13
HENAN PINGGAO ELECTRIC +2
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Problems solved by technology
[0005] The purpose of the present invention is to provide a calculation method for the maximum contact voltage in a gas-insulated substation to solve the inaccurate problem of the existing calculation method
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Embodiment Construction
[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0024] The basic scheme of the present invention is: a method for calculating the maximum contact voltage in a gas-insulated substation, the steps are as follows: 1) read the basic data of each node in the substation, and determine the The circulating current value of the internal grounding grid of the substation gas-insulated combined electrical apparatus; 2) According to the determined circulating current value of the grounding grid and the entire electrical layout in the substation, establish the loop current relationship to determine when a short-circuit fault occurs in the substation. The current value in the circuit and the potential value of various places on the shell of the gas-insulated combined electrical appliance; 3) According to the potentials of various places on the shell of the gas-insulated combined electrical appliance, determine the positio...
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The invention relates to a method for calculating the maximum contact voltage in a gas-insulated substation, including: 1) reading the basic data of each node in the substation, and determining the gas-insulated combined electrical appliance of the substation in combination with the collected three-phase bus current value and frequency value The circulating current value of the internal grounding grid; 2) According to the determined circulating current value of the grounding grid and the entire electrical layout in the substation, the loop current relationship is established to determine the current value in the grounding loop in each grounding body when a short-circuit fault occurs in the substation And the potential value of each place on the shell of the gas-insulated combined electrical appliance; 3) According to the potentials of various places on the shell of the gas-insulated combined electrical appliance, determine the position and value of the maximum contact voltage. The invention has the obvious characteristics of being simple and intuitive, high in accuracy, and clearly expressing the overall situation of the substation.
Description
technical field [0001] The invention relates to a calculation method for the maximum contact voltage in a gas-insulated substation, which belongs to the field of power system operation analysis and safety control. Background technique [0002] When a ground fault occurs in the power equipment, the ground fault current flows through the grounding device, and the potential difference between two points on the ground at a horizontal distance of 0.8m from the equipment and at a vertical distance of 1.8m along the equipment shell is called the contact potential difference; The voltage at two points is called the contact voltage. [0003] With the continuous improvement of the voltage level of the power system, in gas-insulated substations, due to the application of fully enclosed combined electrical appliances, various electrical equipment is encapsulated in metal casings. When a ground fault occurs in the electrical equipment, a huge fault current will be generated on the casing...
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IPC IPC(8): G01R17/20
Inventor 钟建英张一茗孙银山尹军华王振郝莎宋亚凯高群伟李少华张文涛寇新民刘逸凡毛志宽马东岭
Owner HENAN PINGGAO ELECTRIC