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Protection system for slip-ring induction motors

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At a glance




Power Station

The Challenge

To measure large currents at a low frequency (~1Hz) to check the performance of the regulator which was controlling a boiler feed pump motor at a power station.

Motor problems, such as excessive vibration, can be difficult to investigate because they can have both electrical and mechanical causes. Accurate measurement of the slip-frequency currents can help with the diagnosis.

Our Solution

The slip-frequency currents can be measured accurately using Rocoil rigid coils which have very good low-frequency response. The measurements can be used with a protection system to monitor phase imbalance and earth faults.

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