ABB Relion 650 Series Technical Manual page 254

Section 7
Voltage protection
Name Values (Range)
OperationStep2 Disabled
Enabled
Pickup2 1 - 100
t2 0.000 - 60.000
Table 179: ROV2PTOV (59N) Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 6
7.3.6 Monitored data
Table 180: ROV2PTOV (59N) Monitored data
Name
VLevel
7.3.7 Operation principle
Two step residual overvoltage protection ROV2PTOV (59N) is used to detect high single-phase
voltage, such as high residual voltage, also called 3V
directly from a voltage transformer in the neutral of a power transformer or from a three-phase
voltage transformer, where the secondary windings are connected in an open delta. Another
possibility is to measure the three-phase voltages and internally in the IED calculate the
corresponding residual voltage and connect this calculated residual voltage to ROV2PTOV (59N).
ROV2PTOV (59N) has two steps with separate time delays. If the single-phase (residual) voltage
remains above the set value for a time period corresponding to the chosen time delay, the
corresponding TRIP signal is issued.
The time delay characteristic is setable for step 1 and can be either definite or inverse time
delayed. Step 2 is always definite time delayed.
The voltage related settings are made in percent of the global phase-to-phase base voltage
divided by √3.
7.3.7.1 Measurement principle
The residual voltage is measured continuously, and compared with the set values,
Pickup2 .
To avoid oscillations of the output PICKUP signal, a hysteresis has been included.
248
Unit Step
- -
%VB 1
s 0.001
Unit Step
- 1
Type Values (Range)
REAL -
© Copyright 2011 ABB Power Grids. All rights reserved
Default Description
Enabled Enable execution of step 2
45 Voltage start value (DT & IDMT) in % of
VBase for step 2
5.000 Definite time delay of step 2
Default Description
1 Selection of one of the Global Base Value
groups
Unit Description
kV Magnitude of measured voltage
. The residual voltage can be measured
0
1MRK 506 326-UUS B
PID-2718-MONITOREDDATA v5
M15331-3 v4
M15331-6 v4
Pickup1 and
Line distance protection REL650
Technical manual