switching electromagnetic pulse (SEMP)

Switching Electromagnetic Pulses (SEMP) are overvoltages that are triggered by switching operations in the low-voltage systems, medium-voltage systems and high-voltage systems. They are electromagnetically induced voltages that are superimposed on the mains voltage. When switching on and off high active loads and reactive loads such as motors, heating furnaces, induction furnaces, pumps and presses, high voltages of many kilovolts can be induced by the switching currents.