Siemens 7UT51

7UT51 v3
Binary-Signal Inputs, Signal Contacts, Trip Contacts, and LED Indicators
13
PRIM-2330C 131
13.6 Processing External Trip Commands
Up to two desired trip signals from external protection
or supervision units can be incorporated into the
processing of 7UT51. the signals are coupled as
“External signals” via binary-signal inputs. Like the
internal protection and supervision signals, they can
be annunciated as “External trip”, time delayed and
transmitted to the trip matrix. A precondition is that
they are configured to
Existent/Enabled
.
The settings for processing external trip commands
are contained in Address Block 3000.
13.6.1 Normal Operational Status
Each external trip function can be set either to exist or
not exist (addresses 7830 and 7831).
An external trip function exists, it can be configured.
The normal status of each is set in Address 1601.
13.6.2 Time Delays
If a pickup occurs, the function will immediately trip
unless a time delay has been set in Address 3002 or
3102.
If a trip occurs, the contacts and LEDs marshalled to
the event will remain activated until the binary-signal
input controlling the corresponding external trip
function is no longer energized. To ensure that the trip
state lasts long enough for the circuit breaker to
operate, the trip state of each function can be
prolonged by a corresponding reset time delay set in
Address 3003 or 3103.
7830 EXT TRIP 1
7831 EXT TRIP 2
Choice of whether the corresponding external trip
function exists.
Option Description
EXISTENT/
ENABLED
Corresponding external trip
function exists.
NONEXISTENT/
DISABLED
Corresponding external trip
function does not exist (default).
3001 EXT1 STATUS
3101 EXT1 STATUS
Normal operational status of transformer differential
protection (87T and 87HS).
Option Description
OFF Corresponding external trip function is
inactive (default).
ON Corresponding external trip function is active.
BLOCK
TRIPPING
Corresponding external trip function is active
except that trip contacts and signal contacts
will not respond to its events.
3002 T
-
DELAY
3102 T
-
DELAY
Time delay between energization of a binary
-
signal
input marshalled to an external trip function event
and the trip of the external trip function (in addition
to the inherent operating time of the relay).
Range: 0.00
–
60.00 s, or ∞
Default: 0.00 s
3003 T
-
RESET
3103 T
-
RESET
Additional time to remain in trip state after
the binary
-
signal input that caused a trip
becomes de
-
energized (in addition to the
inherent reset time of the relay).
Range: 0.00
–
60.00 s
Default: 0.10 s