Single- And/Or Three-Pole Tripping - ABB REL650 Applications Manual

Section 13
Logic
13.2.2.1
416
• Three-pole tripping for all fault types (3ph operating mode)
• Single-pole tripping for single-pole faults and three-pole tripping for multiphase and
evolving faults (1ph/3ph operating mode). The logic also issues a three-pole tripping
command when phase selection within the operating protection functions is not
possible, or when external conditions request three-pole tripping.
The three-pole trip for all faults offers a simple solution and is often sufficient in meshed
transmission systems and in High Voltage (HV) systems. Since most faults, especially at
the highest voltage levels, are single pole to ground faults, single pole tripping can be of
great value. If only the faulty pole is tripped, power can still be transferred on the line
during the dead time that arises before reclosing. Single pole tripping during single phase
faults must be combined with single pole reclosing.

Single- and/or three-pole tripping

The single-/three-pole tripping will give single-pole tripping for single-phase faults and
three-pole tripping for multi-phase fault. The operating mode is always used together with
a single-phase autoreclosing scheme.
The single-pole tripping can include different options and the use of the different inputs
in the function block.
The inputs 1PTRZ and 1PTREF are used for single-pole tripping for distance protection
and directional ground fault protection as required.
The inputs are combined with the phase selection logic and the pickup signals from the
phase selector must be connected to the inputs PS_A, PS_B and PS_C to achieve the
tripping on the respective single-pole trip outputs TR_A, TR_B and TR_C. The Output
TRIP is a general trip and activated independent of which phase is involved. Depending
on which phases are involved the outputs TR1P, TR2P and TR3P will be activated as well.
When single-pole tripping schemes are used a single-phase autoreclosing attempt is
expected to follow. For cases where the autoreclosing is not in service or will not follow
for some reason, the input Prepare Three-pole Trip P3PTR must be activated. This is
normally connected to the respective output on the Auto- Recloser but can also be
connected to other signals, for example an external logic signal.If two breakers are
involved, one TR block instance and one Auto-Recloser instance is used for each breaker.
This will ensure correct operation and behavior of each breaker.
The output Trip 3 Phase TR3P must be connected to the respective input in SESRSYN
(25) to switch SESRSYN (25) to three-phase reclosing. If this signal is not activated
SESRSYN (25) will use single-phase reclosing dead time.
1MRK 506 334-UUS A
Application manual