ABB RELION 670 SERIES REG670 - Page 454

~
Gen
Generator
Circuit
Breaker
ROV2 PTOV
59N 3Vo>
ROV2 PTOV
59N Vo>
ROV2 PTOV
59N 3Vo>
Unit
transformer
LV side VT
Generator
terminal VT
Generator
29MVA
11kV
150rpm
Grounding
resistor and
neutral point
VT
Unit
Transformer
29MVA
121/11kV
YNd5
110kV Bus
{
{
{
#3
#2
#1
IED
11 0.11
/
3
3
kV
11 0.11
/
3 3
kV
11
/ 0.11
3
kV
1
0
0
0
O
ANSI10000171_2_en.vsd
ANSI10000171 V2 EN-US
Figure 205: Voltage-based stator ground-fault protection
ROV2PTOV (59N) application #1
ROV2PTOV (59N) is here connected to a voltage (or distribution) transformer located
at generator star point.
1. Due to such connection, ROV2PTOV (59N) measures the Uo voltage at the
generator star point. Due to such connection, ROV2PTOV (59N) measures the Vo
voltage at the generator star point. The maximum Vo voltage is present for a single
phase-to-ground fault at the generator HV terminal and it has the maximum
primary value:
Section 10 1MRK 502 071-UUS A
Voltage protection
448 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual