Addr. Parameter C Setting Options Default Setting
_:781:107 Inverse-T 1:Time dial 0.00 to 15.00 1.00
Information List
No. Information Data Class
(Type)
Type
Group indicat.
_:4501:55 Group indicat.:Pickup ACD O
_:4501:57 Group indicat.:Operate ACT O
Inverse-T 1
_:781:81 Inverse-T 1:>Block stage SPS I
_:781:500 Inverse-T 1:>Block delay & op. SPS I
_:781:54 Inverse-T 1:Inactive SPS O
_:781:52 Inverse-T 1:Behavior ENS O
_:781:53 Inverse-T 1:Health ENS O
_:781:60 Inverse-T 1:Inrush blocks operate ACT O
_:781:59 Inverse-T 1:Disk emulation running SPS O
_:781:55 Inverse-T 1:Pickup ACD O
_:781:56 Inverse-T 1:Operate delay expired ACT O
_:781:57 Inverse-T 1:Operate ACT O
Stage with User-Defined Characteristic Curve
Description
This stage is only available in the advanced function type.
This stage is structured the same way as the Inverse-time overcurrent protection – advanced stage (see
chapter 6.5.5.1 Description ). The only differences are as follows:
•
You can define the characteristic curve as desired.
•
The pickup and dropout behaviors of this stage are determined by the standard parameter Threshold
and, if necessary, by an additional parameter Threshold (absolute).
User-Defined Characteristic Curve
With the user-defined characteristic curve, you can define the operate curve point by point using up to 30
value pairs of current and time. The device uses linear interpolation to calculate the characteristic curve from
these values. You can also define a dropout characteristic curve if you wish.
Pickup and Dropout Behaviors with the User-Defined Characteristic Curve
When the input variable exceeds the Threshold value by 1.1 times, the characteristic curve is processed. An
integrating method of measurement totalizes the weighted time. The weighted time results from the charac-
teristic curve. For this, the time that is associated with the present current value is determined from the char-
acteristic curve. Once the weighted time exceeds the value 1, the stage operates.
When the measured value falls short of the pickup value by a factor of 1.045 (0.95 x 1.1 x Threshold value),
the dropout is started. The pickup will be indicated as clearing. You can influence the dropout behavior via
setting parameters. You can select between instantaneous dropout (totalized time is deleted) or dropout
according to the characteristic curve (reduction of totalized time depending on the characteristic curve). The
dropout according to characteristic curve (disk emulation) is the same as turning back a rotor disk. The
weighted reduction of the time is initiated from 0.9 of the set threshold value.
6.5.5.4
6.5.6
6.5.6.1
Protection and Automation Functions
6.5 Overcurrent Protection, Ground
SIPROTEC 5, Overcurrent Protection, Manual 397
C53000-G5040-C017-8, Edition 07.2017
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