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VLF Tan Delta Measuring Instrument - Type HVS 986

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The instrument measures the loss angle of high voltage insulation at low frequencies. In practice low frequency means below 1Hz. The equipment is designed as an add-on to a linear high voltage power supply (VLF power supply)

And as such will measure the loss angle of the insulation in cables at low frequency and high voltage. Changes in the loss angle at low frequencies can indicate degradation of the insulation, which can be used to make decisions about the service life of cables.

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Monitor for the Rotor Circuit of Slip-ring Induction Motors - Type 997

The Slip-ring Induction Motor Monitor has been designed to monitor the rotor circuit (rotor winding, cables and regulator) of large rated slip-ring induction motors such as those used as start and standby boiler feed pumps. The primary function is to detect current unbalance that can arise from regulator unbalance, rotor winding faults and cable problems. It also has an earth fault function available.