—
Current sensors
Combined accuracy class 0.5/5P630 (5P400)
•
Current sensors, thanks to their linear
characteristic, guarantee wide range of
primary current
•
The sensor standard defines accuracy
characteristic as combination of metering
and protection class into one
•
Thus, current sensors transmit currents
from couple of Amps up to short circuit,
therefore accuracy class is defined as
5P630, where 630 is not an error but a real
number calculated out of maximal current
to be transmitted via sensor to secondary
side
Accuracy of sensor is improved by utilizing
correction factors in the protection relays
Slide 28
—
Voltage sensors
Combined accuracy class 0.5/3P
•
For voltage sensors, the sensor standard
defines the accuracy class combining
metering and protection class into one
•
Thus voltage sensors have accuracy
class of 0.5
Slide 29