Question

what is the used of The HFCT and its located cable of the transformer 132 KV Cables (PD) ? and how its work

Answer 1

The HFCT is a high frequency current transformer designed specifically for picking up partial discharge signals. The HFCT sensors are attached temporarily or permanently around the cable and/or earth straps in the switchgear, rotating machine or transformer cable box. It has a split core ferrite to allow retrospective fitting to earth straps without the need for disconnection. The durable body has a hinge and a quick release latch, making use quick and easy. The HFCT is constructed with an aluminium body to provide RF shielding and improved performance in noisy environments.

Partial discharge activity in solid high voltage insulation induces small high frequency currents in the earth conductor of the electrical system. These impulses travel along the equipment earth to the substation earth. Using a high frequency current transformer they can be detected as they pass through the CT.

This transducer is ideal for all earth and neutral PD monitoring applications.