![]() ![]() The high current flow in the motor heats up the rotor quickly due to skin effect. As a result, the motor draws higher current to drive the excessive load. In locked rotor condition the rotor gets locked due to presence of the excessive load. Load jam in motor running condition is taken care by Locked rotor protection available in the relay. The Load Jam protection prevents overheating and mechanical damage due to a locked rotor. ![]() A trip occurs when the thermal capacity used by the motor reaches its 100 %. When the overload persists for a considerable amount of time, the motor temperature and thermal capacity will rise. Under transient and overload conditions the Thermal Capacity of the motor rises, but within the corresponding limits. The purpose of motor thermal protection is to allow the motor to start and run within the defined thermal Capacity limit but trip if the motor heat energy exceeds those ratings because of overloads, negative-sequence current,or locked rotor starting. This indicates when any protection tripping occur causes breaker trips. Motor Protection Relay LED Configuration:
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