Method for calculating maximum voltage withstanding position of zero load high voltage power cable

Abstract

The invention discloses a method for calculating a maximum voltage withstanding position of a zero load high voltage power cable. The method comprises the following steps: resistance per unit length, inductance, capacitance and admittance parameters of a cable loop are calculated according to cable structure parameters; an attenuation coefficient and a phase position coefficient per unit length of the cable are calculated based on the resistance, inductance, capacitance and admittance parameters; the attenuation coefficient and the phase position coefficient are applied to a sine wave function, a sine wave propagation function is built, a calculating model for maximum voltage withstanding capability of all points along the cable is built via a sine wave propagation rule based on the sine wave propagation function, and the maximum voltage withstanding position of the cable can be calculated. The method can help solve a problem that currently no method for calculating the maximum voltage withstanding position of the zero load high voltage power cable is available; analysis guidance can be provided for cable transient breakdown faults in high voltage power frequency operation, variable frequency voltage withstanding tests, damping oscillatory wave tests and the like in a long distance zero load cable line; a data basis can be provided for fault cable line breakdown accident simulation tests.

Description

technical field [0001] The invention relates to a method for calculating the highest withstand voltage position of an unloaded high-voltage power cable, which belongs to the technical field of electric power. Background technique [0002] At present, for long-distance transmission lines, the calculation of sine wave voltage along the transmission line voltage mostly adopts the method of steady-state distributed parameter circuit derivation to calculate the attenuation coefficient and phase coefficient of the line, so as to calculate the steady-state voltage of each point along the line, but it cannot be solved Calculation of transient voltage of sinusoidal traveling wave on transmission line. For the sinusoidal traveling wave along the cable transmission line, there is currently no calculation method for the highest withstand transient voltage of the sinusoidal traveling wave at each point along the long-distance cable transmission line caused by misoperation and faults. C...

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Problems solved by technology

[0002] At present, for long-distance transmission lines, the calculation of sine wave voltage along the transmission line voltage mostly adopts the method of steady-state distributed parameter circuit derivation to calculate the attenuation coefficient and phase coefficient of the line, so as to calculate the steady-state voltage of each point along the line, but it cannot be solved Calculation Problems of Transient Voltage of Sine Traveling Wave on Transmission Line

For the sinusoidal traveling wave along the cable transmission line, there is currently no calculation method for the highest withstand transient voltage of the sinusoidal traveling wave at each point along the long-distance cable transmission line caused by misoperation and faults

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