Functions
2.10 Direct Local Trip
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
140
2.10.2
Setting Notes
General
In order to use the direct and remote tripping functions, address
122
DTT Direct Trip
must have been set
to
Enabled
during the configuration of the device functional scope. At address
2201
Direct Trip(DT)
it
can also be switched
ON
or
OFF
.
It is possible to set a trip delay for both the local external trip and the receive side of the remote trip in address
2202
Trip Time DELAY
. This delay can be used as a safety margin, especially in case of local direct tripping.
Once a trip command has been issued, it is maintained for at least as long as the set minimum trip command
duration
TMin TRIP CMD
which was set for the device in general in address
240
(Section 2.1.3). Reliable
operation of the circuit breaker is therefore ensured, even if the initiating signal pulse is very short. This param-
eter can only be set in DIGSI at
Display Additional Settings
.
2.10.3
Settings
The table indicates region-specific default settings. Column C (configuration) indicates the corresponding sec-
ondary nominal current of the current transformer.
2.10.4
Information List
Addr.
Parameter
C
Setting Options
Default Setting
Comments
2201
Direct Trip(DT)
ON
OFF
OFF
Direct Trip (DT)
2202
Trip Time DELAY
0.00 .. 30.00 sec;
∞
0.00 sec
Trip Time Delay
2203
Iph rel.Trip
1A
0.0 .. 25.0 A;
∞
0.0 A
Minimal Phase Current to
release trip
5A
0.0 .. 125.0 A;
∞
0.0 A
2204
3I0 rel.Trip
1A
0.0 .. 25.0 A;
∞
0.0 A
Minimal 3I0 Current to
release trip
5A
0.0 .. 125.0 A;
∞
0.0 A
No.
Information
Type of In-
formation
Comments
4403
>BLOCK DTT
SP
>BLOCK Direct Transfer Trip option
4417
>DTT Trip ØABC
SP
>Direct Transfer Trip INPUT Phases ABC
4421
DTT OFF
OUT
Direct Transfer Trip is switched OFF
4422
DTT BLOCK
OUT
Direct Transfer Trip is BLOCKED
4435
DTT TRIP ØABC
OUT
DTT TRIP command Phases ABC