FIELD: electricity.
SUBSTANCE: in the method for automatic adjusting the compensation of the arc suppression reactors (ASR) controlled by biasing with an error (compensation deviation) within 1% of the first harmonic of the single-phase earth fault current, a transient is generated in the network zero-sequence circuit by means of a pulsed high-duty cycle reference current source, voltages are measured at the signal winding of the reactor, and a free component of the transient process is extracted, based on the parameters of which the network capacity is calculated by zero-sequence, and, respectively, the corresponding compensation current, the wavelet transform is applied to the voltage measured at the signal winding of the reactor, and the time dependences of the wavelet coefficients are determined, the coefficient with the maximum amplitude is selected, corresponding to the frequency of free oscillations of the circuit zero sequence, while in contact with the maximum wavelet coefficient in frequency range of 35-70 Hz, biasing of the ASR is controlled that changes its inductance as long as the natural frequency of the circuit will not go beyond the specified range, the frequency determines the network capacity and the needed current compensation.
EFFECT: increasing the accuracy of adjusting the arc suppression reactors controlled by biasing.
2 dwg
