Auxiliary Functions
289
7UM62 Manual
C53000-G1176-C149-3
2.45.2 Measurements
Display of
Measured Values
A series of measured values and the values derived from them are constantly
available for call up on site, or for data transfer (See Table 2-19, as well as the
following list).
The operational measured values listed in Table 2-19 can be read out as secondary,
primary or percent values. A precondition for correctly displaying the primary and
percentage values is complete and correct entry of the nominal values for the current
transformers, and protected equipment, in accordance with Subsections 2.3 and 2.5.
Table 2-19 lists the formulae for the conversion of secondary into primary or
percentage values.
Depending on the version ordered, the type of device connection and the configured
protective functions, only a part of the operational measured values listed in Table 2-
19 may be available. The displacement voltage 3U
0
is calculated from the phase-earth
voltages: 3 U
0
= |U
L1
+ U
L2
+ U
L3
|. All three voltage inputs must be phase-ground
connected for this.
Table 2-19
Conversion Formulae between Secondary Values and Primary/Percentage Values
Measured Val.
Secondary
Primary
%
I
L1 S2
, I
L2 S2
,
I
L3 S2
,
I
1 S2
, I
2 S
3
I
0 S2
I
sec S2
I
L1 S1
, I
L2 S1
,
I
L3 S1
,
I
sec S1
Diff. protect. for generators/motors:
Diff. protect. for 3-phase transformer:
I
EE 1
I
EE1 sec
I
EE S2
I
EE2 sec
U
L1E
, U
L2E
,
U
L3E
,
U
0
U
1
, U
2
U
L-E sec.
U
L1-L2
, U
L2-L3
,
U
L3-L1
U
LL sec.
IN–PRI I–CT S2
IN–SEC I–CT S2
--------------------------------------------- I
sec S2
⋅
I
prim. S2
SN GEN/MOTOR
3 UN GEN/MOTOR
⋅
(
)
⁄
-------------------------------------------------------------------------------------------------------------------
100
⋅
IN–PRI I–CT S1
IN–SEC I–CT S1
--------------------------------------------- I
sec S1
⋅
I
prim. S1
SN GEN/MOTOR
3 UN GEN/MOTOR
⋅
(
)
⁄
-------------------------------------------------------------------------------------------------------------------
100
⋅
I
prim. S1
SN TRANSF
3 UN WIND.S1
⋅
(
)
⁄
------------------------------------------------------------------------------------------
100
⋅
FACTOR IEE1
I
EE1 sec
⋅
I
EE1 prim
.
SN GEN/MOTOR
3 UN GEN/MOTOR
⋅
(
)
⁄
-------------------------------------------------------------------------------------------------------------------
100
⋅
FACTOR IEE2
I
EE2 sec
⋅
I
EE2 prim.
SN GEN/MOTOR
3 UN GEN/MOTOR
⋅
(
)
⁄
-------------------------------------------------------------------------------------------------------------------
100
⋅
UN–VT PRIMARY
UN–VT SECONDARY
-----------------------------------------------------------
U
L-E sec
⋅
U
prim.
UN GEN/MOTOR
3
(
)
⁄
---------------------------------------------------------------
100
⋅
UN–VT PRIMARY
UN–VT SECONDARY
-----------------------------------------------------------
U
LL sec
⋅
=
U
prim.
UN GEN/MOTOR
-----------------------------------------------
100
⋅
