Table of Contents
Advertisement
1MRK 502 071-UUS A
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
High Voltage Side
(Load Current) I
L
Low Voltage Side
ANSI10000044 V1 EN-US
Figure 281:
Signal flow for a single transformer with voltage control
On the HV side, the three-phase current is normally required in order to feed the three-
phase over current protection that blocks the load tap changer in case of over-current
above harmful levels.
The voltage measurement on the LV-side can be made single phase-ground. However,
it shall be remembered that this can only be used in solidly grounded systems, as the
measured phase-ground voltage can increase with as much as a factor √3 in case of
ground faults in a non-solidly grounded system.
The analog input signals are normally common with other functions in the IED for
example, protection functions.
The LV-busbar voltage is designated V
point voltage V
I
,I
,I
A
B
C
signals/alarms
position
3ph or ph-ph or 1ph Currents
3ph or ph-ph or 1ph Voltages
VB (Busbar Voltage)
Line Impedance R+jX
Load Center
VL (Load Point Voltage)
.
L
Section 15
Control
IED
raise,lower
BOM
BIM
MIM
TRM
ANSI10000044-1-en.vsd
, the load current I
and load
B
L
599
Advertisement
Table of Contents
