Thermal Overload Protection Holding The Auto-Reclosing Function Back - ABB REL650 Applications Manual

1MRK 506 334-UUS A
11.2.2.14
11.2.3
11.2.3.1
Application manual

Thermal overload protection holding the auto-reclosing function back

If the input THOLHOLD (thermal overload protection holding reclosing back) is
activated, it will keep the reclosing function on a hold until it is reset. There may thus be
a considerable delay between start of Auto-Reclosing and reclosing command to the
circuit-breaker. An external logic limiting the time and sending an inhibit to the INHIBIT
input can be used. The input can also be used to set the Auto-Reclosing on hold for a longer
or shorter period.
Setting guidelines
Configuration
Use the PCM600 configuration tool to configure signals.
Autorecloser function parameters are set via the local HMI or Parameter Setting Tool
(PST). Parameter Setting Tool is a part of PCM600.
Recommendations for input signals
Please see examples in figure 139.
ON and OFF
These inputs can be connected to binary inputs or to a communication interface block for
external control.
RI
It should be connected to the trip output protection function, which starts the autorecloser
for 3-phase operation (SMBRREC ,79) function. It can also be connected to a binary input
for start from an external contact. A logical OR-gate can be used to combine the number
of start sources.
If StartByCBOpen is used, the CB Open condition shall also be connected
to the input RI.
INHIBIT
To this input shall be connected signals that interrupt a reclosing cycle or prevent a start
from being accepted. Such signals can come from protection for a line connected shunt
reactor, from transfer trip receive, from back-up protection functions, busbar protection
trip or from breaker failure protection. When the CB open position is set to start
SMBRREC(79) , then manual opening must also be connected here. The inhibit is often
a combination of signals from external IEDs via the IO and internal functions. An OR gate
is then used for the combination.
Section 11
Control
311