ABB Relion 650 Series Technical Manual page 259

1MRK 506 326-UUS B
Table 185: LOVPTUV (27) Group settings (advanced)
Name Values (Range)
tPulse 0.050 - 60.000
tBlock 0.000 - 60.000
tRestore 0.000 - 60.000
Table 186: LOVPTUV (27) Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 6
7.4.6 Operation principle
The operation of Loss of voltage check LOVPTUV (27) is based on line voltage measurement.
LOVPTUV (27) is provided with a logic, which automatically recognises if the line was restored for
at least
output TRIP is activated. The PICKUP output signal indicates pickup.
Additionally, LOVPTUV (27) is automatically blocked if only one or two phase voltages have been
detected low for more than
LOVPTUV (27) operates again only if the line has been restored to full voltage for at least
Operation of the function is also inhibited by fuse failure and open circuit breaker information
signals, by their connection to dedicated inputs of the function block.
Due to undervoltage conditions being continuous the trip pulse is limited to a length set by
setting tPulse .
The operation of LOVPTUV (27) is supervised by the fuse-failure function (BLKV input) and the
information about the open position (CBOPEN) of the associated circuit breaker.
The BLOCK input can be connected to a binary input of the IED in order to receive a block
command from external devices or can be software connected to other internal functions of the
IED itself in order to receive a block command from internal functions. LOVPTUV (27) is also
blocked when the IED is in test mode and LOVPTUV (27) has been blocked from the HMI test menu
Blocked = Yes ).
(
Line distance protection REL650
Technical manual
Unit
s
s
s
Unit
-
tRestore before starting the tTrip timer. All three phases are required to be low before the
tBlock .
© Copyright 2011 ABB Power Grids. All rights reserved
Step Default
0.001 0.150
0.001 5.000
0.001 3.000
Step Default
1 1
Voltage protection
Description
Duration of TRIP pulse
Time delay to block when all 3ph voltages
are not low
Time delay for enable the function after
restoration
Description
Selection of one of the Global Base Value
groups
Section 7
SEMOD171765-4 v4
tRestore .
253