Logic
[lovssumm-140611-01.tif, 3, en_US]
Figure 8-16
Logic Diagram of the Voltage-Sum Supervision
The device measures the phase-to-ground voltage and the ground voltage of the lines to be protected. The
sum of the 4 voltages must be 0.
Threshold
If the calculated fault voltage (V
F
) exceeds the
Threshold
, the parameter
Delay failure indication
triggers the indication
Failure
.
The device calculates the fault voltage (V
F
) with the formula:
VF = |VA+ VB + VC + Vph/VN • VN |, where Vph/VN forms the
Matching ratio Vph / VN
parameter.
The
Matching ratio Vph / VN
parameter takes into account the differing transformation ratios between
the residual voltage input and the phase-voltage inputs.
You can find more information in this respect in chapter
Delay failure indication
When the threshold value for the delay of the failure indication (parameter:
Delay failure indication
)
is exceeded, the indication
Failure
is generated.
Blocking the Function
The following blockings reset the picked up function completely:
•
Externally or internally via the binary input signal
>Block function
•
A protection pickup
The pickup signal of a protection function blocks the
Failure
indication.
Supervision Functions
8.3 Supervision of the Secondary System
956
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Summary of Contents for 6MD85
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