JKF

CURRENT TRANSFORMERS | OUTDOOR OPERATION

  • Split core CT
  • Hole diameters up to 700 mm
  • Various sizes available
  • Primary current up to 4000 A

Type JKF cable current transformers are used in outdoor switchgears. They transform high currents up to 4000 A into standardised values for meters, measuring and protection devices.

General description

Type JKF cable current transformers are used in outdoor switchgears. They transform high currents up to 4000 A into standardised values for meters, measuring and protection devices.

The outdoor version of the cable current transformer is designed for installation on fully insulated medium and high voltage cables or for installation on medium and high voltage bushings. This enables space-saving system design. Primary currents of up to 4000 A can be measured.

A specific core padding and the complete casting of all active parts in cycloaliphatic epoxy resin suitable for outdoor applications ensures that the magnetic properties, and therefore the class accuracy, remain constant for decades.

The standard secondary terminal box permits a housing degree of protection up to IP 65.

Thanks to a wide range of geometric dimensions the cable current transformer can be adapted to customer requirements. Applicable installation options are also available in various designs. Any type of installation position can be realised.

The transformers are designed according to applicable national and international standards. Designs meeting customer-specific standards are generally possible.

Advantages
JKF
  • Suitable for installation over fully insulated HV and MV cables

  • Suitable for installation on bushings

  • Suitable for indoor and outdoor applications with degree of protection IP 20, IP 40 or IP 65

  • Wide range of geometric dimensions

  • Any installation position
Technical data
Type JKF
StandardIEC / IEEE
Highest voltage for equipmentkV0.72
Rated power-frequency withstand voltagekV3
FrequencyHz16.7 / 50 / 60
Primary rated currentA1 - 4000
Secondary rated currentA1 / 5
Rated short-time thermal current [Ith]kA / 1s100 x In
Rated dynamic current [Idyn]kA2.5 x Ith
Accuracy class0.1-3; 0.2S; 0.5S; P; PR; PX; PXR; TPX; TPY; TPZ
Max. number of CT cores1
 
Type JKF
Height of unitHmmmax. 350
Internal diameterDimm160 - 1200
External diameterDamm400 - 1400