High frequency current transformer couplers

Product Documents
  • Split-core and permanent HFCTs available
  • Can be used for HF, VHF, and UHF applications
  • Easy to install
  • Ideal for periodic or permanent on-line PD measurements
  • Low cost alternative for UHF PD sensors
  • High measuring bandwidth
  • Several diameters available

The HFCTs (High Frequency Current Transformers) are current couplers designed for the decoupling of PD signals and can be used as accessories for multiple applications in MV, HV, and EHV range and can be used for HF, VHF, and UHF applications. The HFCT sensors are attached around the cable/accessories earth connection (e.g., a cable earth screen).

Megger offers permanent as well as split-core HFCT sensors. Permanent HFCT sensors are ideal for assets where permanent monitoring is required or where getting outages is almost impossible. In the latter case, having pre-installed HFCT sensors will allow you to perform on-line PD monitoring without the need of an outage.

The split-core HFCTs are ideal for spot testing where there is direct access to the earth. The split-core HFCTs can also be used inside switchgear cabinets, but in most of these cases, for safety reasons, an outage is required.