ABB UniGear Series, Engineering Manual

Page: 41 / 112

ENGINEERING S ENS O RS
1VLG5 00007 E 29
Maximum current Start and protection setting values
If the ratio of the application nominal current I
n
and sensor-rated primary current I
pr
becomes
higher, and the rated secondary value needs to be set higher than 46.875 mV / Hz, the high-
est value that the relay can measure before the current sensor input
is saturated is smaller
than the maximum setting value of the current protection.
Table 4: Maximum current Start and protection setting values
Application Nominal current
(I
n
)
Rated Secondary Value with
80 A / 0.150 V at 50 Hz
Maximum current Start and
protection setting values
... 1 250 A 1.000 … 46.875 mV / Hz 40 x I
n
1 250 … 2 500 A 46.875 … 93.750 mV / Hz 20 x I
n
2 500 … 4 000 A 93.750 … 150.000 mV / Hz 12.5 x I
n
Priority
Each current sensor has unique physical polarity defined by sensor hardware.
Figure 34: Current sensor with unique physical polarity