Application
φsh
typical
Setting
Rotation angle of ref. volt.
30
o
Range 60
o
to 30
o
for PP faults
Selected: 45
o
30
o
Range 60
o
to 30
o
for PP faults
Selected: 45
o
Input signal:
>Test of direction
If you activate the binary input signal
>Test of direction
, the direction is determined and indicated even
without the current threshold being exceeded in one of the stages. This provides an easy means of checking
the direction during commissioning, without changing the threshold values of the stages.
Influence of Other Functions via Dynamic Settings
The influence of these functions via dynamic settings is described in chapter
7.4.8.2 Application and Setting Notes (Advanced Stage)
.
Application Notes for Parallel Lines
Parallel Lines or Transformers
In parallel lines or transformers with infeed at one end (see
), if there is no directional measuring
element, a fault on feeder T1 will also trip the other feeder T2. In contrast, a directional measuring element in
the devices on busbar B prevents the tripping of the circuit breaker in the parallel feeder. Therefore, in
, directional overcurrent protection is used in the places marked with direction arrows. Please
note that the forward direction of the protection device represents the direction towards the object to be
protected. This does not have to be the same as the power direction of normal power flow.
Set time grading in opposition to the power flow with increasing time. As load can only flow in one direction,
you can set the directional devices without time delay.
7.6.8
7.6.9
Protection and Automation Functions
7.6 Directional Overcurrent Protection, Phases
SIPROTEC 5, High-Voltage Bay Controller, Manual
697
C53000-G5040-C015-9, Edition 11.2017
Summary of Contents for 6MD85
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