ABB REG316 4 Series Operating Instructions Manual page 115

REG 316*4 1MRB520049-Uen / Rev. F
Typical settings:
Current
Delay
Hold-Voltage
Hold-Time
Should the rated currents of generator and c.t's differ apprecia-
bly, compensation of the overcurrent setting is recommended, if
this has not already been done with the aid of the reference
value of the A/D channel.
Example:
Generator rated current
C.t. rated current
Typical value
(referred to the rated
current of the protection)
Compensated setting:
I
4000
GN
= =
15 . 15 .
I 5000
N 1
since the rated voltages of generator and v.t's are generally the
same, compensation of the undervoltage setting is seldom
necessary.
Should they differ, the compensated setting would be:
U
GN
0 7 .
U
N 1
1.5 I
N
3 s
0.7 U
N
0.5 s
12 .
ABB Switzerland Ltd
I = 4 000 A
GN
I = 5 000 A
N1
1.5
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