ABB REG670 Applications Manual

3U
0
UL1
IEC07000190-2-en.vsd
IEC07000190 V2 EN
Figure 206: Earth fault in Non-effectively earthed systems
10.3.3.6 Direct earthed system
In direct earthed systems, an earth fault on one phase is indicated by voltage collapse
in that phase. The other healthy phase will still have normal phase-to-earth voltage.
The residual sum will have the same value as the remaining phase-to-earth voltage,
which is shown in Figure 207.
UL1
IEC07000189-2-en.vsd
IEC07000189 V2 EN
Figure 207: Earth fault in Direct earthed system
Section 10 1MRK 502 071-UEN -
Voltage protection
416 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual

ABB REG670 Specifications

General

Brand	ABB
Model	REG670
Category	Protection Device
Language	English