The application to supervise the voltage on two voltage transformers in the generator
circuit is shown in figure 211.
Vd>
V1
v2
To Protection
To Excitation
Gen
en06000389_ansi.vsd
ANSI06000389 V1 EN-US
Figure 211: Supervision of fuses on generator circuit voltage transformers
10.5.3 Setting guidelines
SEMOD153915-5 v3
The parameters for the voltage differential function are set via the local HMI or
PCM600.
The following settings are done for the voltage differential function.
Operation: Off/On
GlobalBaseSel: Selects the global base value group used by the function to define
IBase, VBase and SBase as applicable.
BlkDiffAtVLow: The setting is to block the function when the voltages in the phases are
low.
RFLx: Is the setting of the voltage ratio compensation factor where possible differences
between the voltages is compensated for. The differences can be due to different
voltage transformer ratios, different voltage levels e.g. the voltage measurement inside
the capacitor bank can have a different voltage level but the difference can also e.g. be
used by voltage drop in the secondary circuits. The setting is normally done at site by
evaluating the differential voltage achieved as a service value for each phase. The
Section 10 1MRK 502 071-UUS A
Voltage protection
462 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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