Siemens siprotec 7SJ63, Инструкция по эксплуатации

Страница: 227 / 604

Functions
6-63
7SJ63 Manual
C53000-G1140-C120-1
If a relay element picks up while the dynamic settings are enabled, elapse of the
$F
WLYH7LPH
or
6WRS7LPH
will not restore the normal pickup settings until drop out
of the relay element occurs based on the dynamic settings.
If the dynamic cold load pick-up function is blocked via a binary input, all triggered tim-
ers will be immediately reset and all normal settings will be restored. If blocking occurs
during an on-going fault with dynamic cold load pick-up functions enabled, the timers
of all directional and non-directional overcurrent relay elements will be stopped, and
then restarted based on their normal duration.
During power up of the protective relay with an open circuit breaker, the time delay set
at address
&%2SHQ7LPH
is started, and is processed using the normal set-
tings. Therefore, when the circuit breaker is closed, the normal settings are effective.
Figure 6-29 shows a timing diagram, Figure 6-30 describes the logic for cold load pick-
up function.
Figure 6-29 Cold Load Pickup Timing Sequence
Breaker
Closed
Open
“CB open“-Timer
“Active Time-Timer“
“CB open“
“CB open“
“Active Time“
Possible shorter
CLP, due to
“Stop Time“
Operating State
“Stop Time“-Timer
“Normal“
PickUp Levels
“CLP“ setting active
“normal setting active“
“Stop Time“
Pickup
Dropout
Trip, if increased
power demand is
present after “Ac-
tive Time“ expired increased power consumption
after long outage
www
. ElectricalPartManuals
. com