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2 Functions
Display of mea-
Operational measured values and metered values are determined in the background
sured values
by the processor system. They can be called up on the front of the device, read out
via the operator interface using a PC with DIGSI, or transferred to a control centre via
the system interface.
Table 2-11 shows a survey of the measured values of the local device. Depending on
the version ordered, the connection of the device, and the configured protection func-
tions, only a part of the measured operating values listed in Table is available.
Phase-to-earth voltages can only be measured if the phase-to-earth voltage inputs are
connected. The displacement voltage 3U
connected — or calculated from the phase-to-earth voltages 3U
All three voltage inputs must be phase-earth connected for this.
Both devices connected via the protection interface form a joint frequency value (con-
stellation frequency). This value is displayed as the operational measured value „Fre-
quency". It allows to display a frequency even in devices in which local frequency mea-
surement is not possible. The constellation frequency is also used by the differential
protection for synchronizing the measured values. Locally operating functions always
use the locally measured frequency.
If the device is in „Log out device" ON mode, in differential protection test mode or if
there is no protection data interface connection, the locally measured frequency is dis-
played.
For the thermal overload protection, the calculated overtemperatures are indicated in
relation to the trip overtemperature. Overload measured values can appear only if the
overload protection was configured Enabled.
The power and operating values upon delivery are set such 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 for 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 1107 P,Q sign the signs for these com-
ponents can be inverted.
The computation of the operational measured values is also executed during an exis-
tent system fault in intervals of approx. 0.5s.
248
is e-n-voltage multiplied by v3 — if U
0
= |U
0
is
en
+ U
+ U
|.
L1
L2
L3
7SD610 Manual
C53000-G1176-C145-4
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