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 9.3.6.1 Overview of Functions ).
Operate delay
When the threshold value for the Operate delay 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.
Application and Setting Notes
Parameter: Threshold
•
Recommended setting value (_:3) Threshold = 25 V
The Threshold parameter is used to set the voltage which the device uses to recognize the calculated fault
voltage (V
F
) as a failure of the voltage sums. Siemens recommends using the default setting.
Parameter: Operate delay
•
Recommended setting value (_:6) Operate delay = 5.00 s
Set the Operate delay parameter so that overfunctions due to disturbing influences (such as switching
operations) are avoided. Siemens recommends using the default setting.
Settings
Addr.
Parameter C Setting Options Default Setting
Supv. sum V
_:1 Supv. sum V:Mode
•
off
•
on
•
test
off
_:3 Supv. sum V:Threshold 0.300 V to 170.000 V 43.300 V
_:6 Supv. sum V:Delay
supervision alarm
0.00 sto 100.00 s 5.00 s
Information List
No.
Information Data Class
(Type)
Type
Supv. sum V
_:82 Supv. sum V:>Block function SPS I
_:54 Supv. sum V:Inactive SPS O
_:52 Supv. sum V:Behavior ENS O
_:53 Supv. sum V:Health ENS O
_:71 Supv. sum V:Failure SPS O
9.3.6.4
9.3.6.5
9.3.6.6
Supervision Functions
9.3 Supervision of the Secondary System
SIPROTEC 5, Overcurrent Protection, Manual 1263
C53000-G5040-C017-8, Edition 07.2017
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