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

Belted cables or with individually screened conductors with earth straps looped back through the HFCT.




HFCT sensors installation on single core cables

Earth strap looped back through HFCT. Mounted using silicone collars.




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

HFCT Sensor Range

HFCT-100 PD sensors for cables
Installation Type Permanent / Portable Permanent / Portable Permanent Permanent
Internal Aperture 45 mm 94 mm 140 mm 96 mm
Ex/ATEX Certified Version Yes Yes Yes Yes
Outdoor Version No Yes Yes Yes

Contact us

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