Measurement; Functional Description - Siemens Siprotec 7UM611 Manual

2.35.2 Measurement

A series of measured values and the values derived from them are constantly avail-
able for call up on site, or for data transfer (See table 2-12, as well as the following list).

2.35.2.1 Functional Description

Display of Mea- The operational measured values listed in Table 2-12 can be read out as secondary,
sured Values primary or percent values. A precondition for correctly displaying the primary and per-
centage values is complete and correct entry of the nominal values for the current
transformers and other equipment, as well as the transformation ratios of the current
and voltage transformers in the earth paths, in accordance with Subsections2.3 and
2.5. Table 2-12 lists the formulae for conversion of secondary into primary or percent-
age values.
Depending on the version ordered, the type of device connection and the configured
protection functions, only a part of the operational measured values listed in the fol-
lowing table may be available. The displacement voltage 3 U
phase-earth voltages: 3 U
ground connected for this.
Table 2-12
Measured Secondary
Values
I , I , I
L1 L2 sec.
I , I , I ,
L3 1 2
3I
0
I I
Ns EE sec.
U , U
L1E Ph-N sec.
U ,
L2E
U ,
L3E
U , U , U
0 1 2
U , U
L1-L2 Ph Ph sec.
U ,
L2-L3
U
L3-L1
U U
0 E sec.
7UM61 Manual
C53000-G1176-C127-3
= |U
0
Conversion formulae between secondary values and primary/percentage
values
Primary
U measured:
E
U computed:
E
+ U + U |. All three voltage inputs must be phase-
L1 L2 L3
2.35 Ancillary Functions
is calculated from the
0
%
211