GE DTR GEK-106305A, Instruction Manual

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2. OPERATION PRINCIPLES
8 DTR Digital Tap Changer Controller GE—106305A
The Operation Time to initiate a tap change will be calculated in the following way:
Tb = 10 * ID / |DV| tb==Base Time
OT = FT * tb
The user can set the Time Factor (FT) and DV is the deviation between the real voltage and the setpoint
calculated in the following way (depending on the selected algorithm)
Algorithm 1: Voltage regulation:
DV = V
0
- V
m
V
0
: setpoint, V
m
: Measured voltage
Algorithm 2: Compensating by means of the calculation of apparent current:
DV = (V
0
+ V
com
) - V
m
V
0
=setpoint, V
m
= Measured voltage
V
com
= K
com
* I
m
/ I
n
K
com
==Calculation of current (Adjustable)
I
m
=Measured current, I
n
=Nominal current
Only when V
com
< V
comax
Otherwise
V
com
= V
comax
V
comax
==Maximum voltage increase (Adjustable).