![ABB Relion 670 series Technical Manual Download Page 722](http://html.mh-extra.com/html/abb/relion-670-series/relion-670-series_technical-manual_3045226722.webp)
REG 670
RXTTE 4
I
V
230 V AC
120 V AC
0
Generator rotor winding
G
313
314
315
421
428
324
325
221
222
Optional external
resistor
Connection to be done by
the panel builder / field
contractor
en07000185_ansi.vsd
321
ANSI07000185 V1 EN-US
Figure 383: Connection of rotor ground fault protection
By using a two stage directional current measurement in the General current and voltage
protection (CVGAPC), as shown in figure
, the ground fault current on the DC side of the
excitation is detected. The protection operates when the resistive component of the measured
injected current exceeds the pre-set operate level. Stage one provides an alarm signal and stage
two trips the generator after a short time delay for fully developed rotor ground faults.
Section 11
1MRK 502 066-UUS B
Multipurpose protection
716
Technical manual
Summary of Contents for Relion 670 series
Page 1: ... RELION 670 SERIES Generator protection REG670 Version 2 1 ANSI Technical manual ...
Page 2: ......
Page 48: ...42 ...
Page 62: ...56 ...
Page 182: ...176 ...
Page 692: ...686 ...
Page 726: ...720 ...
Page 1014: ...1008 ...
Page 1242: ...1236 ...
Page 1362: ...1356 ...
Page 1386: ...1380 ...
Page 1422: ...1416 ...
Page 1431: ...1425 ...