FIELD: electrical engineering.
SUBSTANCE: invention is aimed to increase the efficiency of voltage reduction at the point of a single-phase short circuit (SSC). It is achieved by the fact that in the method of compensating capacitive currents in electrical networks with an isolated neutral, a single-phase active resistance is first briefly connected to the bus section, the current in the resistance and the zero-sequence voltage on the section in the voltage transformer are measured, the network resistance set point is formed relative to the section buses, the set point is stored in electronic control unit of the compensating device. When a short-circuit fault occurs at one of the connections of the section, the zero-sequence voltage is measured, and a current in the neutral is automatically formed in the current source as the ratio of the module of the measured zero-sequence voltage to the set point, lagging behind the zero-sequence voltage by 90 degrees. The changed zero-sequence voltage is measured again, a new value of the total current in the neutral is formed in the current source as the ratio of the measured complex zero-sequence voltage to the setting, then the process of forming the total current in the neutral is iteratively repeated until the difference between the modules of the measured zero-sequence voltage and the previous measured zero-sequence voltage will not be less than a specified value, for example 1%.
EFFECT: increase the efficiency of voltage reduction at the point of a single-phase short circuit.
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