MEGGER HFCT HIGH Frequency Current Transformers

The MEGGER HFCT HIGH FREQUENCY are designed for decoupling of PD signals and can be used for multiple applications in MV, HV and EHV range.

SKU: 5010

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Megger High Frequency Current Transformers (HFCT) are innovative devices crafted to optimize partial discharge (PD) monitoring across various electrical systems, extending from medium voltage (MV) to extra high voltage (EHV) applications. Specifically engineered for the decoupling of PD signals, HFCT sensors are adept at enhancing the reliability and performance of electrical infrastructure.

These sensors are typically attached around the earth connection of cable accessories, such as a cable earth screen, facilitating accurate and efficient PD signal extraction. Megger provides two primary types of HFCT sensors to meet diverse application needs: permanent and split-core.

Permanent HFCT sensors are particularly suited for installations where continuous monitoring is essential. This type of sensor is invaluable for assets where operational downtime is rare or difficult to schedule. With permanent HFCT sensors in place, utilities and service providers can perform online PD monitoring seamlessly, eliminating the need for power outages and thereby minimizing disruption and downtime.

Split-core HFCT sensors, on the other hand, offer flexibility and convenience for spot testing scenarios. These sensors are designed to be easily applied and removed, making them ideal for temporary diagnostics where direct access to the earth screen is available. While split-core HFCTs can be used within switchgear cabinets, safety protocols typically require a power outage to ensure the safety of personnel during their installation and operation.


  • Frequency range (-3 dB):

HFFCT 20:100 kHz – 150 MHz,HFCT SC40:100 kHz – 20 MHz,HFCT SC60:100 kHz – 20 MHz

  • Transfer-impedance (1 MHz):

HFFCT 20:ca. 4.2 Ohm,HFCT SC40:ca. 4 Ohm,HFCT SC60:ca. 4 Ohm

  • Inner diameter:

HFFCT 20:Ø 21 mm 0.83 in,HFCT SC40:40 x 22 mm 1.57 in. x 0.87 in,HFCT SC60:Ø 60 mm 2.36 in

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Megger since 1889 is a leading global premium manufacturer of measurement and testing technology. Megger top priority has always been to make your everyday work easier and safer. As such, insulation testers, micro-ohmmeters, and multimeters are among the long line of Megger inventions, making this brand one of the pioneers in the electrical industry. Megger products combine many years of experience and the valued feedback from our global users with the inventiveness and conscientiousness of our product developers. In Germany, we manufacture at three sites, Aachen, and Baunach near Bamberg and Radeburg near Dresden. Other manufacturing locations are based in Sweden, England, and America.


DATA sheet

Data Sheet


Model Frequency Range (-3 dB) Transfer-Impedance (1 MHz) Inner Diameter
HFFCT 20 100 kHz – 150 MHz ca. 4.2 Ohm Ø 21 mm (0.83 in)
HFCT SC40 100 kHz – 20 MHz ca. 4 Ohm 40 x 22 mm (1.57 in. x 0.87 in)
HFCT SC60 100 kHz – 20 MHz ca. 4 Ohm Ø 60 mm (2.36 in)