ABB KOKM 1 EB KOKM 1 ED KOKM 1 DB KOKM 1 CB indoor cable low-voltage current transformers,
n resin insulation. These types are suitable for the measurement of phase currents.
A busbar or cable serves as the primary conductor.
Current transformers from the KOKM series can also be use to measure phase currents,
at voltages higher than 1.2 kV if the insulation of the high-voltage primary conductor fulfils the requirements,
of the relevant standards relate to the working voltage. Inner diameter of EB/ED is 72 mm, DB 60 mm and CB 50 mm.
Technical parameters Transformer type:
KOKM 1 EB
KOKM 1 ED
KOKM 1 DB
KOKM 1 CB
Highest voltage for equipment, Um 1.2 kV
Rated power-frequency withstand voltage 6 kV
Rated lightning impulse withstand voltage –
Rated frequency fR 50 or 60 Hz
Rated primary current, Ipr 50 – 1 250 A
Extended current rating 1.2 × Ipr A
Rated short-time thermal current, Ith max. 50 kA/1s
Rated dynamic current, Idyn 2.5 × Ith kA
Conformity with standards IEC, ANSI, GOST, others
on request
Maximal number of cores 3
