Current Transformer JK

Cable current transformers type JK are used in indoor switchgears. They transform high currents up to 5000 A into standardized values for meters, measuring and protection devices.

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 a space-saving system design. Primary currents of up to 5000 A can be measured. A specific core padding and the complete casting of all active parts in polyurethane (PUR) ensures that the magnetic properties, and therefore the class accuracy, remain constant for decades. The standard secondary terminal enclosure permits a housing degree of protection up to IP 20. Optionally, secondary terminals can be integrated in a terminal box, providing a housing degree of protection of 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, as well as any type of installation position. The transformers are designed according to applicable national and international standards. Designs that meet customer-specific standards are possible on request.

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Features

  • Constant class accuracy
  • Wide range of geometric dimensions
  • Any installation position

Specifications and Downloads

Technical Specifications

Dimensions

Technical data

Type JK

 

 

Standard   DIN / IEC / IEEE
Highest voltage for equipment kV 0.72
Rated power-frequency withstand voltage kV 3
Frequency Hz 16.7 / 50 / 60
Primary rated current A 1 - 5000
Secondary rated current A 1 / 5
Rated short-time thermal current [lth] kA / 1s 100 x In
Rated dynamic current [ldyn] kA 2.5 x lth
Accuracy class  

0.1 – 3; 0.2S; 0.5S; P; PR; PX; PXR; TPX; TPY; TPZ

Max. number of cores   4

Type JK

           
Transformer size A mm 230 350 400 450
Height of unit H mm 80 - 180 80 - 300 100 - 300 100 - 300
Internal diameter D mm 50 - 180 60 - 250 100 - 290 100 - 290
Distance between screw holes at base B mm 200 300 350 400

 

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Related Products

Current Transformer JKS-S / JKS

  • Suitable for subsequent installation over fully insulated HV and MV cables
  • Suitable for indoor applications with degree of protection IP 20, on request IP 40
  • Wide range of geometric dimensions
  • Secondary terminals for cables up to max. diameter of 6 mm2

Current Transformer JKF

  • Suitable for installation over fully insulated HV and MV cables
  • Suitable for installation on bushings
  • Wide range of geometric dimensions
  • Any installation position

Current Transformer JK-G / JKS-G

  • Ring core or split CT
  • Hole Diameters up to 225 mm
  • Various sizes available
  • Primary current up to 3000 A

Current Transformer JLD

  • Porcelaine or Silicone bushing available
  • Can be equipped with several CT's
  • Various Versions for indoor and outdoor application
  • Primary current up to 6'000 A