Overcurrent Protection During Manual Close Of Breaker - Siemens 7UT51 Instruction Manual

8
Time Overcurrent Protection (50HS and 50/51)
8.5 Reset Time Delay
To ensure that the time between a trip and reset lasts
long enough for the circuit breaker to operate, the trip
state can be prolonged by a reset time delay
(Address 2118).
2118 TresetTRIP
Additional time to remain in trip state after
dropout of an overcurrent element (in addition
to the inherent reset time of the relay).
–
Range: 0.00 60.00 s
Default: 0.10 s
102
8.6 Overcurrent Protection
during Manual Close of
Breaker
When closing a breaker manually, there should be no
time delay between an overcurrent pickup and trip. If
the breaker can indicate that a manual close is in
progress (by activating a binary input of the relay), the
behavior of the overcurrent element can be
temporarily changed, as specified in Address 2121.
2121 M/C MODE P
Behavior of overcurrent protection element when breaker is
being closed manually. A binary signal from the breaker must
be wired to one of the relay's binary inputs that is marshalled
to event 356, ">MANUAL CLOSE" (see Section 13.2 on
page 126). The change in behavior remains in effect only as
long as the binary input is being activated by the signal from
the breaker.
Option Description
INACTIVE No change in behavior (default).
50HS w/o Immediate trip if the fundamental component of
DELAY a measured current reaches the 50HS pickup
threshold (Address 2103).
51 w/o Immediate trip if fundamental component of a
DELAY measured current reaches the 50 or 51 pickup
threshold (addresses 2112 or 2114, depending
on which element is chosen in Address 2111).
7UT51 v3
PRIM-2330C