Measurement; Display Of Measured Values - Siemens SIPROTEC 7SJ62 Manual

2.23.3

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.

2.23.3.1 Display of Measured Values

Table 2-27
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)
I = measured I
N N sec
value of I input
N
I I
Ns Ns sec.
(I ,
Ns
,
I
3I0real
I
3I0reactive
V , V , V , V
A B C Ph-N sec.
V , V , V ,
0 1 2
V
4
V , V , V V
A–B B–C C–A Ph-Ph sec.
V V
N N sec.
P, Q, S No secondary measured values
(P and Q phase-
segregated)
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
Conversion formulae between secondary values and primary/percentage values
primary
Functions
2.23 Auxiliary Functions
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