Siemens 6MD85, Manual

Page: 1033 / 1256

selectively. The integrals are referred to the squared rated normal current of the circuit breaker as shown in
the following formula, with phase A as example.
[FoCBWI2T-301012-01.tif, 1, en_US]
Where:
I
rated
Rated normal current
i
A
(t) Sampled measured current value of phase A
The calculated squared tripping current integrals are added to the existing statistic values.You can reset or
preset the statistic value according to the specific application.
Circuit-Breaker Maintenance Warning
If the statistic value of any phase lies above the threshold, a phase-selective warning signal is generated.
Application and Setting Notes
Parameter:
Threshold
•
Default setting
(_:101) Threshold
=
10 000.00 I/Ir*s
You use the
Threshold
parameter to specify the maximum permitted integral of squared sampled measured
values of the phase currents.
Settings
Addr. Parameter C Setting Options Default Setting
I2t-method
_:1 I2t-method:Mode
•
off
•
on
•
test
off
_:101 I2t-method:Threshold 0.00 I/Ir*s to 21400000.00 I/Ir*s 10000.00 I/Ir*s
Information List
No. Information Data Class
(Type) Type
I2t-method
_:54 I2t-method:Inactive SPS O
_:52 I2t-method:Behavior ENS O
_:53 I2t-method:Health ENS O
_:301 I2t-method:ΣI²t A BCR O
_:302 I2t-method:ΣI²t B BCR O
_:303 I2t-method:ΣI²t C BCR O
_:304 I2t-method:Warning ACT O
9.6.6.2
9.6.6.3
9.6.6.4
Measured Values, Energy Values, and Supervision of the Primary System
9.6 Circuit-Breaker Wear Monitoring
SIPROTEC 5, High-Voltage Bay Controller, Manual 1033
C53000-G5040-C015-9, Edition 11.2017