ABB REF 610 Technical Reference Manual

than the reclaim time (e.g. half of the reclaim time), the blocking of stage I>> (in
this case) will be reset before the AR function. Stage I>> will now be able to
continue the AR sequence and the pumping effect will thus be avoided.
6.1.2. Fast tripping and initiation of shot 1 using start signals
An alternative way to achieve fast tripping and shot initiation (typical for certain
countries, such as Finland), is to use start signals from protection stages for shot
initiation. The AR function of REF 610 can be initiated by the start signals from
stages I> and I
0
>.
The start time of stages I> and I
0
> is very short but can be extended with the settings
AR I> start Delay and AR I
0
> start Delay of the AR function. When the
set start delay elapses, the shot will be initiated and the AR function will trip the
circuit breaker by issuing the Open CB Command.
I>
0→1
t>
t>
t
Trip
Start
Close CB
CB closed
CB open
Shot 1
Shot 2 Shot 3
Definite Trip
I> Start
I> Trip
I> Trip
Open CB
I> start delay
Open CB
Open CB Command
Close CB Command
Close CB
Command
Open CB
Command
Close CB
Command
Close CB
Command
I> start delay
I> start delay
Open CB
Command
I> Start
Shots 1, 2 and 3
initiation
Shot 1 initiation
A040361
Fig. 6.1.2.-1 Fast initiation of shot 1 using start signals
Shot initiation by a start signal applies only to shot 1, and to definite tripping, i.e.
when no more shots are allowed but the network fault has not been cleared. In this
case, the AR function will trip the circuit breaker on expiration of AR I> start
Delay and AR I
0
> start Delay.
The signal Open CB Command must be routed to the output contact
used for tripping the circuit breaker.
154
REF 610REF 610
Feeder Protection Relay
Technical Reference Manual
1MRS755310

ABB REF 610 Specifications

General

Brand	ABB
Model	REF 610
Category	Relays
Language	English