15.2.2.22 Thermal overload protection holding the auto recloser back
If the THOLHOLD input (thermal overload protection holding auto reclosing back) is
activated, it will keep the auto recloser on a hold until it is reset. There may thus be a
considerable delay between start of the auto recloser and the breaker closing 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 recloser on hold for
a longer or shorter period.
15.2.3 Setting guidelines
15.2.3.1 Configuration
Use the PCM600 configuration tool to configure signals.
Auto recloser 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 Figure
311, Figure 312 and Figure 313 and default factory configuration for
examples.
BLKOFF
Used to unblock the auto recloser when it has been blocked due to activating BLKON input
or by an unsuccessful auto reclosing attempt if the BlockByUnsucCl setting is set to On.
BLKON
Used to block the auto recloser, for example, when certain special service conditions arise.
When used, blocking must be reset with BLKOFF.
CBCLOSED and CBREADY
These binary inputs should pick-up information from the circuit breaker. At three
operating gears in the circuit breaker (single pole operated circuit breakers) the connection
should be “All poles closed” (series connection of the NO contacts) or “At least one pole
open” (parallel connection of NC contacts). The CBREADY is a signal meaning that the
circuit breaker is ready for an auto reclosing operation, either Close-Open (CO), or Open-
Close-Open (OCO). If the available signal is of type “circuit breaker not charged” or “not
ready”, an inverter can be inserted in front of the CBREADY input.
INHIBIT
To this input shall be connected signals that interrupt an auto 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
Section 15 1MRK 506 369-UUS -
Control
666 Line distance protection REL670 2.2 ANSI
Application manual
To Next Page
Loading...
