Siemens 6MD85, Manual

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All other cases result in 3-pole operate.
3-Pole Coupling
3-pole coupling describes the situation when the trip logic decides to execute 3-pole tripping despite the pres-
ence of a 1-pole operate indication.
This may be the case under the following circumstances:
•
The Automatic reclosing function cannot execute a 1-pole cycle. This is expressed by the cleared signal
79 permits 1-pole trip
.
•
If an upstream device has caused 1-pole tripping and the device in question detects this pole as open (via
the process monitor in the Line protection function group) and the device in question detects a fault in
another conductor
•
If 1-pole tripping reoccurs within 50 ms after an instance of 1-pole tripping has been cleared
•
If the permission for 1-pole tripping is canceled by the AR (internal or external) after a cleared 1-pole trip
(during the 1-pole pause)
By default, 3-pole coupling is carried out based on the cumulative operate indication. Optionally, the group
pickup indication can also be taken into account (parameter
3-pole coupling
). In this case, every multi-
phase pickup results in a 3-pole coupling, including pickups of different phases from different stages/func-
tions.
2-Phase Short-Circuits
For 2-pole faults, you set the behavior with the parameter
Trip at 2ph short circuit
.
•
3-pole
Tripping is executed in the event of 2-pole faults.
•
1-pole, leading phase
1-pole tripping takes place in the event of 2-pole faults without grounding. The leading phase is tripped
(for more information, see
Table 5-6 ). In the event of a BC fault, for example, pole B is tripped. 3-pole
tripping takes place in the event of 2-pole faults with grounding.
•
1-pole, lagging phase
1-pole tripping takes place in the event of 2-pole faults without grounding. The lagging phase is tripped.
In the event of a BC fault, for example, pole C is tripped. 3-pole tripping takes place in the event of 2-pole
faults with grounding.
Coupling Table
The following table shows the coupling table for Figure 5-34 . This table also explains its impact on 2-phase
faults.
Table 5-6 Coupling
Input Output
Impact of the parameter
Trip at 2ph short circuit
3-pole 1-pole, leading phase 1-pole, lagging phase
A B C Groun
d A B C A B C A B C
1 0 0 0 1 0 0 1 0 0 1 0 0
0 1 0 0 0 1 0 0 1 0 0 1 0
0 0 1 0 0 0 1 0 0 1 0 0 1
1 1 0 0 1 1 1 1 0 0 0 1 0
0 1 1 0 1 1 1 0 1 0 0 0 1
1 0 1 0 1 1 1 0 0 1 1 0 1
1 1 1 0 1 1 1 1 1 1 1 1 1
Function-Group Types
5.6 Function-Group Type Circuit Breaker, 1-/3-Pole
232 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017