Measured Values - Siemens siprotec 7SA522 User Manual

7.1.3

Measured Values

7.1.3.1 Measured Values
Read-out of
Measured Values
7SA522 Manual
C53000-G1176-C119-2
Figure 7-15 Setting statistic values in DIGSI
Operating measured values are determined in the background by the processor sys-
tem. They can be called up at the front of the device, read out via the operating inter-
face using a PC with DIGSI
tem 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.
In the 7SA522 with maximum functionality the measured values as shown in Table 7-
1 are available.
The displacement voltage 3U
nected 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 parame-
terized as "forward".
The sign of the power factor cos ϕ corresponds to the sign of the real power.
In addition to those measured values listed in the table, it is possible to retrieve user
defined measurement, metering and set points, if these were generated during the
configuration of the device according to Section 5.3 "Generating user definable func-
tions with CFC".
®
4 — example
®
4, or transferred to a central master station via the sys-
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 con-
).
7-13