Function Logic; Pickup Logic For The Entire Device; Tripping Logic For The Entire Device - Siemens SIPROTEC 4 7SD80 Manual

2.16

Function Logic

Pickup Logic for the Entire Device

2.16.1
Phase Segregated Fault Detection
The fault detection logic combines the fault detection (pickup) signals of all protection functions. The protec-
tion functions that allow phase segregated pickup the output is done in a phase segregated manner. If a
protection function detects a ground fault, this is also output as a common device alarm. Thus the alarms
Relay PICKUP ØA , Relay PICKUP ØB , Relay PICKUP ØC and Relay PICKUP G are available.
The above indications can be routed to LEDs or output relays. For some protection functions, also the picked
up phases are available as a group indication for displaying fault indications locally or transmitting them to a
PC or control center; only one group indication is displayed at a time and represents the entire pickup situa-
tion.
General Pickup
The pickup signals are combined with OR and lead to a general pickup of the device. It is signaled with the
alarm Relay PICKUP . If no protection function of the device has picked up any longer, Relay PICKUP
disappears (message: "OFF").
General device pickup is a precondition for a series of internal and external functions that occur subsequently.
The following internal functions are controlled by general device pickup:
•
Opening of fault case: From general device pickup to general device drop out, all fault messages are
entered in the trip log.
•
Initialization of fault storage: The storage and maintenance of fault values can also be made dependent
on the occurrence of a trip command.
•
Generation of spontaneous indications: Certain fault indications can be displayed as spontaneous indica-
tions (see margin heading "Spontaneous indications"). This indication can also be made dependent on
the general device trip.
•
Start action time of automatic reclosure (if available and used)
External functions may be controlled by this indication via an output contact. Examples are:
•
Automatic reclose devices,
•
Channel boost in conjunction with signal transmission by PLC,
•
Further additional devices or similar.
Spontaneous Indications
Spontaneous displays are fault messages which appear in the display automatically following a general fault
detection or trip command of the device. For the 7SD80, these messages include:
"Relay PICKUP.":
"S/E/F TRIP":
PU Time :
TRIP Time :

Tripping Logic for the Entire Device

2.16.2
3-Pole Tripping
The device trips 3-pole in the event of a fault. The output function
command to the circuit breaker.
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
protective function that picked up;
protection function which tripped (only device with
graphic display);
Operating time from the general pickup to the
dropout of the device, in ms;
the operating time from general pickup to the first
trip command of the device, in ms;
Relay TRIP is used for to send the
Functions
2.16 Function Logic
177