ANALYSIS OF ELECTROMAGNETIC PROCESSES IN THE "VOLTAGE LIMITER - LOW-FREQUENCY FILTER" CIRCUIT DURING THE INFLUENCE OF HIGH-VOLTAGE SURGE FROM THE POWER SUPPLY NETWORK

In the work, a theoretical analysis of high-voltage surge (HVS) passing from a power supply network through the path "voltage limiter - low-pass filter" is carried out, with the aim to evaluate the effectiveness of the filter on reducing the amplitude of the residual HVS at the input of electrical and/or radio-electronic equipment. As a low-pass filter (LPF), an L-shaped filter was chosen. Typical means of limiting the amplitude of the HVS (gas-filled arresters, varistors, and suppressors) are analyzed, and their shortcomings are shown. The justification of the equivalent scheme for theoretical analysis is given. The analysis revealed a direct relationship between the cut-off frequency of the LPF, which is deter-mined by the nominal values of its elements, and the amplitude of the residual HVS at the mains input of the equipment, and also showed the effectiveness of inserting the LPF between the output of a typical HVS voltage limiter and the mains input of the mentioned equipment from the point of view of additional reduction of the residual HVS amplitude. References 18, figures 6.