Current Transformer JKF
Type JKF cable current transformers are used in outdoor switchgears. They transform high currents up to 4000 A into standardized 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 realized. The transformers are designed according to applicable national and international standards. Designs meeting customer-specific standards are generally possible.
Specifications and Downloads
Technical Specifications
JKF
Technical data
Type JKF | ||
| 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 - 4000 |
| Secondary rated current | A | 1 /5 |
| Rated short-time thermal current [lth] | kA / 1s | 100 x ln |
| 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 CT cores | 1 (more than 1 on request) |
Type JKF | |||
| Height of unit | H | mm | max. 350 |
| Internal diameter | Di | mm | 160 - 1200 |
| External diameter | Da | mm | 400 - 1400 |
*other dimensions on request
