6
1VLG5 00007 E
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
th
(31.5 kA). With KECA 250 B1 sensors, measuring class 0.5 is reached for
continuous current measurement in the extended accuracy range from 5 % of the rated
primary current I
pr
not only up to 120 % of I
pr
(as being common for conventional current
transformers), but even up to the rated continuous thermal current I
cth
(2 000 A). That
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
2 000 A
–
Rated primary current
250 A / 150 mV at 50 Hz or 250 A / 180 mV at 60 Hz
–
Accuracy class
0.5 / 5P125
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