Direct Grounded System; Settings For Two Step Residual Overvoltage Protection - ABB REB670 Applications Manual
Busbar protection 2.1 ansi, relion 670 series
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Also See for REB670:
- Applications manual (554 pages) ,
- Commissioning manual (196 pages) ,
- Operator's manual (116 pages)
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Section 8
Voltage protection
8.3.3.5
8.3.3.6
242
Direct grounded system
In direct grounded systems, an ground fault on one phase indicates a voltage collapse in
that phase. The two healthy phases will have normal phase-to-ground voltages. The
residual sum will have the same value as the remaining phase-to-ground voltage. See
figure 101.
ANSI07000189 V1 EN
Figure 101:
Ground fault in Direct grounded system
Settings for Two step residual overvoltage protection
Operation: Disabled or Enabled
VBase (given in GlobalBaseSel) is used as voltage reference for the voltage. The voltage
can be fed to the IED in different ways:
1.
The IED is fed from a normal voltage transformer group where the residual voltage
is calculated internally from the phase-to-ground voltages within the protection. The
setting of the analogue input is given as VBase=Vph-ph.
2.
The IED is fed from a broken delta connection normal voltage transformer group. In
an open delta connection the protection is fed by the voltage 3V0 (single input). The
1MRK 505 337-UUS -
ANSI07000189-1-en.vsd
Application manual
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