Pole slip is a phenomenon caused by low excitation, a faulty regulator or abrupt changes of load within the mains. For a quick explanation, watch the short animation from ComAp below.
It can cause severe mechanical stress within the generator, putting winding at risk, causing shaft damage or adversely affecting the control operating system.
Very high currents can cause thermal instability and ultimately lead to complete destruction of the generator and immense instability on the grid.
Conventional protection, such as overcurrent, vector shift and ROCOF is not sufficient as it doesn’t respond quickly enough and is unreliable where large load jumps develop and cause oscillations.
An innovative solution from ComAp, available in the InteliPro protection relay from IPU, is able to predict imminent pole slip in time to minimise the destructive effects of lost synchronism without the need for complicated settings.
It is able to disconnect the mains at the very moment pole slip occurs, strengthening the overall protection of synchronous generators by preventing unnecessary damage to embedded power systems. Severe electrical and mechanical damage to the generator, its drive, shaft, winding and electrical connections can be avoided.
It’s the perfect solution where pole slip protection is required such as STOR sites.