The motor surge protection bank (MSP) provides protection against insulation failure for motors, other rotating machines, and dry-type transformers. This yields assurance of continuous operation of the equipment, the electrical system and the manufacturing process.
The primary function of the MSP motor surge protection bank is to guard the winding insulation of the device being protected. Station class, and metal oxide lightning arresters act to limit the maximum voltage to the device, at a predetermined magnitude. Specially designed surge capacitors, connected in parallel with the arresters, control the rate of rise of the resultant overvoltage. The combination of surge arresters and surge capacitors serve to limit the turn-to-turn insulation stress on the device being protected.