High Frequency Current Transformer (HFCT)

Measures Partial Discharge (PD) in a range of electrical MV/HV assets

Our HFCT Sensors Are Inductively Coupled Around the MV/HV Cables To Provide a Means for On-line PD Measurements To Be Made on In-service Cables, Transformers and Rotating Machines

Each sensor inductively measures the high frequency current signals within the PD pulses flowing in the earth or the conductor of the cable without the need for any direct, galvanic connection to the HV. The sensors can be installed permanently during a planned outage or at the build stage of a project to enable On-line PD monitoring or routine spot testing. A temporary installation of the HFCT sensors can be carried out without an outage if the cable earth is available outside of the termination box, enabling On-line PD spot testing without the need for permanent sensors or an outage.

HFCT Sensor Installation At Crutch of 3-core Cable

A single HFCT sensor can be installed across all three cable phases at the cable cutch.

HFCT Sensors Installation On Single Core Cables

HFCT sensors installed around the conductor of each of the cable’s phases, with the earth looped back through the sensors. Mounted using silicone collars.

HFCT Sensor Range

All types of sensors are compatible for use with the HVPD Kronos® Permanent and HVPD Kronos® Spot Tester.