ABB Relion 670 series - Settings for Two Step Residual Overvoltage Protection

V
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A
V
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B
V
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C
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F
I
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ANSI07000189-1-en.vsd
ANSI07000189 V1 EN
Figure 290: Ground fault in Direct grounded system
10.3.3.6 Settings for two step residual overvoltage protection
Operation: Disabled or Enabled
VBase (given in GlobalBaseSel) is used as voltage reference for the set pickup values. 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).
Section Analog inputs in the Application manual explains how the analog input needs
to be set.
3. The IED is fed from a single voltage transformer connected to the neutral point of a
power transformer in the power system. In this connection the protection is fed by the
voltage VN=V
0
(single input). Section Analog inputs in the Application manual
explains how the analog input needs to be set.
ROV2PTOV (59N) will measure the residual voltage corresponding to the nominal
phase-to-ground voltage for a high-impedance grounded system. The measurement will
be based on the neutral voltage displacement.
The setting parameters described below are identical for the two steps (n = step 1 and 2).
Therefore the setting parameters are described only once.
Section 10 1MRK 506 369-UUS -
Voltage protection
578 Line distance protection REL670 2.2 ANSI
Application manual