Arcteq AQ-S215, Instruction Manual

Page: 144 / 289

• from Trip with two shots (both fail)
• from Trip with two shots (high-speed fails, time-delayed succeeds)
• from Trip with two shots (high-speed succeeds)
• from Start with two shots (both fail)
• from Start with two shots (high-speed fails, time-delayed succeeds)
• from Start with two shots (high-speed succeeds).
The signal status graphs describe the statuses of available requests, the statuses of the auto-
recloser's internal signals, the statuses of the timers, the breaker controls from the auto-
recloser function as well as the breaker status signals.
The auto-recloser function operates closely with the object control and monitoring function, and all
breaker status and monitor signals are forwarded from the selected object to the auto-
recloser function. The circuit breaker's "Open" and "Close" signals are also controlled through the
dedicated object. When the breaker cannot be closed (because it is not ready or the closing is waiting
for a Synchrocheck allowance), the wait state is forwarded to the auto-recloser function to wait for the
object's acknowledgement either of a successful closing or of a failure time-out. A similar situation can
arise in the circuit breaker's "Open" command, for example, if the command is blocked because of an
SF
6
gas leakage. In failure acknowledgement situations the auto-recloser function is always put to a
lock-out state with a requirement for resetting once the cause of the lock-out is cleared. Resetting is
done by an external input to the function or by closing the breaker.
Auto-recloser sequence from Trip with two shots (both fail).
In this auto-recloser scheme, the TRIP signal from the directional eath fault protection function (I0dir>
TRIP) was set up as the operation starter for Request 2 (REQ2). REQ2 has two shots (Shots 1 and 2)
enabled with the setting detailed in the image below; the first one is a high-speed shot (0.2 s) that is
then followed by a time-delayed shot (60 s).
Figure. 5.4.4 - 91. Settings for I0dir> with two shots.
When the TRIP signal is used to initiate the auto-recloser sequence, no additional starting or
discrimination times are needed as the protection stage's own operation takes care of the breaker
opening timings directly. Therefore, the auto-recloser function only monitors the status of the directional
earth fault stage's tripping before initiating requests and shots.
A AQ Q-S215 -S215
Instruction manual
Version: 2.04
143