Description : 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.
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