No. Information Type of
Informa-
tion
Comments
30759 φI12= MV Phase angle of current I12
30760 U4 = MV Operat. meas. voltage U4
30761 U0meas.= MV Operat. meas. voltage U0 measured
30762 U0calc.= MV Operat. meas. voltage U0 calculated
30792 φUL1E= MV Phase angle of voltage UL1E
30793 φUL2E= MV Phase angle of voltage UL2E
30794 φUL3E= MV Phase angle of voltage UL3E
30795 φU4= MV Phase angle of voltage U4
30796 φUE= MV Phase angle of voltage UE
Thermal Measurement
Depending on its configuration, the device can determine and display thermal measurement values.
Functional Description
The measured thermal values are listed in Table 2-15. They can only be displayed if the overload protection
functions has been configured as Enabled. Which measured values are possible also depends on the overload
detection method chosen and, in certain cases, of the number of temperature detectors connected via the
RTD-box.
The hot-spot temperatures are calculated in transformers for each leg. Therefore, temperatures are indicated
with a phase (in the case of Y windings), or with a phase-phase concatenation (D windings). For standard
vector groups, this information correspond to the ends of the windings. In more unusual vector groups (which
are created by phase swapping), the phase assignment in the vector group is not always clear.
The thermal values are referred to the tripping temperature rise. For degrees of temperature there are no
referred values. However, since further processing of such values (in CFC or when transmitted through serial
interfaces) requires values without dimension, arbitrary references have been chosen, which are contained in
Table 2-15 in the column “% conversion”.
Table 2-15
Thermische Messwerte
Measured values Dimension
% Conversion
4)
θ
L1
/θ
OFF
; θ
L2
/θ
OFF
;
θ
L3
/θ
OFF
1)
Thermal value of each phase, referred to
the tripping value
%
θ/θ
OFF
1)
Thermal resultant value, referred to the
tripping value
%
Ag.rate
2)
3)
Relative ageing rate L p.u.
Res Warn
2)
3)
Load reserve to hot-spot/ageing alarm
(stage 1)
%
Res Alarm
2)
3)
Load reserve to hot-spot tripping (stage %
θ leg L1; θ leg L2; θ
leg L3
2)
3)
Hot-spot temperature for each phase (Y
winding or Z winding)
°C or °F
0 °C = 0 %
500 °C = 100 %
0 °F = 0 %
1000 °F = 100 %
θ leg L12; θ leg L23;
θ leg L31
2)
3)
Hot-spot temperature for each phase (D
winding)
°C or °F
θ RTD 1... θ RTD 12
3)
Temperature measured at the Tempera-
ture detectors 1 to 12
°C or °F
1)
only for overload protection with thermal replica (IEC 60255-8): Address 142 THERM. OVERLOAD = th
repl w. sens
2.22.3
2.22.3.1
Functions
2.22 Auxiliary Functions
SIPROTEC 4, 7UT6x, Manual 285
C53000-G1176-C230-5, Edition 09.2016
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