Measured Values - Siemens siprotec 7SA6 User Manual

7.1.3

Measured Values

7.1.3.1 Measured Values
Read-out of
Measured Values
7SA6 Manual
C53000-G1176-C133-1
Figure 7-18 Setting statistic values in DIGSI
Operating measured values are determined in the background by the processor
system. They can be called up at the front of the device, read out via the operating
interface using a PC with DIGSI
system interface (if available).
No password entry is required to view the measured values. The values are updated
every few seconds.
Most measured values can be displayed in primary quantities, secondary quantities,
and percentages based on nominal values. A precondition for correct display is that
the nominal values be correctly set in the power system data.
Secondary values are values measured at the device terminals or values calculated
from the latter values.
In the 7SA6 with maximum functionality the measured values as shown in Table 7-1
are available.
The displacement voltage 3U
connected to the voltage input U
The power measurements P, Q are positive, if real power or inductive reactive power
flows into the protected object. This is assuming that this direction has been
parameterized as "forward".
The sign of the power factor cos ϕ corresponds to the sign of the active power.
For the thermal overload protection the calculated temperature rise values are related
to the tripping temperature rise.
If the device is provided with the synchronism and voltage check function, the
characteristical values (voltages, frequences, differences) can be read out.
®
4 — example
®
4, or transferred to a central master station via the
is either measured directly (3U
0
) or calculated (from 3U
4
Control During Operation
= √3·U
, if U
0 en en
= U + U + U
0 L1-E L2-E L3-E
is
).
7-15