The application to supervise the voltage on two voltage transformers in the generator
circuit is shown in figure 294.
Vd>
V1
v2
To Protection
To Excitation
Gen
en06000389_ansi.vsd
ANSI06000389 V1 EN
Figure 294: Supervision of fuses on generator circuit voltage transformers
10.5.3 Setting guidelines
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
Section 10 1MRK 506 369-UUS -
Voltage protection
588 Line distance protection REL670 2.2 ANSI
Application manual
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