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2.20.3
Measurement
A series of measured values and the values derived from them are constantly available for call up on site, or
for data transfer.
Applications
• Information on the actual status of the system
• Conversion of secondary values to primary values and percentages
Prerequisites
Except for secondary values, the device is able to indicate the primary values and percentages of the measured
values.
A precondition correct display of the primary and percentage values is the complete and correct entry of the
nominal values for the instrument transformers and the protected equipment as well as current and voltage
transformer ratios in the ground paths when configuring the device. The following table shows the formulas
which are the basis for the conversion of secondary values to primary values and percentages.
When using the capacitive voltage connection, or with the connection types Vab, Vbc or Vab, Vbc, Vx of
the voltage transformers (address 213VT Connect. 3ph), the measured values for power P, Q, S, power
factor, energy and the derived values, such as mean values etc. are not available.
Measured values which cannot be calculated due to the selected voltage connection are shown as dots.
2.20.3.1 Display of Measured Values
Table 2-20
Measured
second-
values
ary
, I
, I
,
I
I
A
B
C
sec
I
, I
1
2
I
= 3 ·I
I
N
0
N sec
(calculated)
= measured
I
I
N
N sec
value from the I
N
input
I
I
Ns
Ns sec.
(I
,
Ns
,
I
3I0real
I
3I0reactive
I
= measured
I
N2
N2 sec.
value from the
I
input
E2
V
, V
, V
,
V
A
B
C
Ph-N sec.
V
, V
, V
0
1
2
V
, V
, V
V
A–B
B–C
C–A
Ph-Ph sec.
V
V
N
N sec.
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
Conversion formulae between secondary, primary and percentage measured values
primary
Functions
2.20 Auxiliary Functions
%
273
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