Secondary equipment electromagnetic compatibility problems have become increasingly prominent

With the ultra-high voltage grid, intensive direction and microelectronics technology in the wide application of the secondary equipment, substation electromagnetic Voltage stabilizer , secondary equipment, electromagnetic compatibility problems have become increasingly prominent, research substation switching transients and the effect on two times the cable coupling mechanism having a weightTo  mcb circuit breaker  and application value. This paper, based on finite-difference time-domain (FDTD) method to study the field of substation switching transients time-domain  air circuit breaker , substations and cable trench soil transient electromagnetic field distribution, bounded wave electromagnetic pulse (EMP) simulator transmission line designed for near-field Finite length cable coupling mechanism, as well as the transient electromagnetic field coupling cable numerical methods.