Siemens 6MD85, Manual

Page: 965 / 1256

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Threshold
The
Threshold
parameter is the lower limit of the operating range of the Current-sum supervision func-
tion.
Delay failure indication
When the calculated fault current (I
F
) exceeds the calculated fault current limit (I
Fmax
), the delay of the failure
indication (parameter:
Delay failure indication
) starts. If the threshold-value violation persists for
that time, the
Failure
indication 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 indication
Failure
.
Application and Setting Notes
Parameter: Slope factor
•
Recommended setting value
(_:101) Slope factor
=
0.1
The
Slope factor
parameter is used to set the ratio between the minimum (I
min
) and the maximum (I
max
)
phase current. This function calculates the RMS values.
Parameter: Threshold
•
Recommended setting value
(_:102) Threshold
=
0.1 A
for I
rated
= 1 A or
0.5 A
for I
rated
= 5 A
The
Threshold
parameter is used to set the maximum phase current (I
max
).
Parameter: Delay failure indication
•
Recommended setting value
(_:6) Delay failure indication
=
5.00 s
Set the
Delay failure indication
parameter so that overfunctions due to disturbing influences (such as
switching operations) are avoided.
Settings
Addr. Parameter C Setting Options Default Setting
Supv. sum I
_:1 Supv. sum I:Mode
•
off
•
on
•
test
off
_:102 Supv. sum I:Threshold 1 A @ 100 Irated 0.030 A to 10.000 A 0.100 A
5 A @ 100 Irated 0.15 A to 50.00 A 0.50 A
1 A @ 50 Irated 0.030 A to 10.000 A 0.100 A
5 A @ 50 Irated 0.15 A to 50.00 A 0.50 A
1 A @ 1.6 Irated 0.001 A to 1.600 A 0.100 A
5 A @ 1.6 Irated 0.005 A to 8.000 A 0.500 A
_:101 Supv. sum I:Slope factor 0.00 to 0.95 0.10
8.3.9.4
8.3.9.5
Supervision Functions
8.3 Supervision of the Secondary System
SIPROTEC 5, High-Voltage Bay Controller, Manual 965
C53000-G5040-C015-9, Edition 11.2017