EFT/B interference transmission model and method of anti-interference in a coal mine monitoring substation

Coal mining monitoring system has been enforcing tests for the immunity of Electromagnetic Compatibility (EMC) since 2006. However, not all monitoring substations can pass the Electrical Fast Transient/Burst (EFT/B) immunity test and the explosion-proof test simultaneously. In order to enhance EMC, the EFT/B interfere transmission model was presented at the substation power port, after the EFT/B test method was used to analyze the monitoring substation power ports. Hence, a low-pass filter was designed by using the simulation software PIPICE and an anti-jamming method was proposed by way of a parallel connection of the discharge interfere circuit and the low-pass filter. The improved complex EMI filter was made up of an interference discharge device and a filter. The dynamic equivalent circuit was proposed for the EFT/B immunity test. As a result, the monitoring substation has passed the EFT/B immunity and explosion-proof tests with the complex filter. It is concluded that the complex EMI filter has significantly enhanced the immunity of the coal mining monitoring system.