Figure 34: Current Sensor With Unique Physical Polarity; Table 4: Maximum Current Start And Protection Setting Values - ABB UniGear Series Engineering Manual

E NG INEE R ING
Maximum current Start and protection setting values
If the ratio of the application nominal current I
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
... 1 250 A
1 250 ... 2 500 A
2 500 ... 4 000 A
Priority
Each current sensor has unique physical polarity defined by sensor hardware.

Figure 34: Current sensor with unique physical polarity

1V LG 5 000 07 E
Rated Secondary Value with
(I ) 80 A / 0.150 V at 50 Hz
n
1.000 ... 46.875 mV / Hz
46.875 ... 93.750 mV / Hz
93.750 ... 150.000 mV / Hz
and sensor-rated primary current I
n
Maximum current Start and
protection setting values
S E NS O R S
becomes
pr
40 x I
n
20 x I
n
12.5 x I
n
2 9