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Permanent HFCT sensors are installed inside the HV cable box (of the switchgear, transformer or rotating machine) to enable OLPD testing and/or monitoring of in‑service MV/HV cable circuits without the need for an outage. We also supply Ex/ATEX versions of this permanent HFCT sensor for use in hazardous gas zones in the oil & gas industry.
High-current HFCT sensors have been designed for applications where there are high conductor currents (350 A and 1000 A versions of this sensor are available from HVPD). Specifically designed for the application of OLPD monitoring of large rotating HV machines, the high‑current HFCT sensors are suitable for the measurement of PD in machines rated up to 20 MVA and above.
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