Functions
2.18 Auxiliary Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
257
Depending on the type of device ordered and the device connections, some of the operational measured values
listed below may not be available. The phase–to–Ground voltages are either measured directly, if the voltage
inputs are connected phase–to–Ground, or they are calculated from the phase–to–phase voltages V
A–B
and
V
B–C
and the displacement voltage V
N
.
The displacement voltage V
N
is either measured directly or calculated from the phase-to-Ground voltages:
Please note that value V
0
is indicated in the operational measured values.
The ground current I
N
is either measured directly or calculated from the conductor currents.
In addition, the following may be available:
• Θ/Θ
Trip
thermal measured value of overload protection value for stator in % of the trip initiating overtem-
perature
• Θ/Θ
LTrip
thermal measured value of restart inhibit (rotor winding)
• Θ
Restart
restarting limit of restart inhibit
•T
Reclose
total time, before the motor can be restarted
• Θ
RTD 1
to Θ
RTD 12
temperature values at the RTD-boxes.
Upon delivery, the power and operating values are set in such manner that power in line direction is positive.
Active components in line direction and inductive reactive components in line direction are also positive. The
same applies to the power factor cosϕ . It is occasionally desired to define the power drawn from the line (e.g.
as seen from the consumer) positively. Using parameter 1108 P,Q sign the signs for these components can
be inverted.
The calculation of the operational measured values also takes place while a fault is running. The values are
updated at intervals of > 0.3 s and < 1 s.
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