Figure 4: Current Sensor Keca 250 B1 - ABB UniGear Series Engineering Manual

KECA 250 B1
For dynamic current measurement (protection purposes) the ABB sensors KECA 250 B1, fulfil
requirements of protection class 5P up to an impressive value reaching the rated short-time
thermal current I
continuous current measurement in the extended accuracy range from 5 % of the rated
primary current I
transformers), but even up to the rated continuous thermal current I
provides the possibility to designate the corresponding accuracy class as 5P125, proving
excellent linearity and accuracy measurements.

Figure 4: Current sensor KECA 250 B1

Technical parameters
– Continuous thermal current
– Rated primary current
– Accuracy class
6
(31.5 kA). With KECA 250 B1 sensors, measuring class 0.5 is reached for
th
not only up to 120 % of I
pr
(as being common for conventional current
pr
2 000 A
250 A / 150 mV at 50 Hz or 250 A / 180 mV at 60 Hz
0.5 / 5P125
(2 000 A). That
cth
1V LG 5 00007 E