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Report
No.
132230
7.1
TABLE: temperature rise measurements
P
Monitored point:
dT (K) at
253V, 50Hz
dT (K) at
198V, 50Hz
dT (K) at
253V, 60Hz
dT (K) at
198V, 60Hz
Limit dT (K)
*)
Sub transformer core
36.7
31.3
35.8
31.3
85
E-capacitor, C112 body
26.6
23.6
26.5
23.6
85
°C
PWB near D109
27.9
24.9
27.6
25.1
95
Ambient 24.0
o
C 25.7
o
C 24.9
o
C 25.5
o
C -
Winding temperature rise
measurements
measurements
253V,
50Hz
198V,
50Hz
253V,
60Hz
198V,
60Hz
—
Ambient temperature t1 (
o
C) :
22.0 22.0 22.0 22.0
—
Ambient temperature t2 (
o
C) :
24.0 25.7 24.9 25.5
—
Temperature rise dT of winding:
R
1
(Ω)
R
2
(Ω)
dT (K)
Limit dT (K)
*)
Insulation
class
Sub transf. Pri. winding (253V, 50Hz)
3782
4435
42.3
85
E
Sub transf. Pri. winding (198V, 50Hz)
3782
4314
32.4
85
E
Sub transf. Pri. winding (253V, 60Hz)
3782
4386
38.1
85
E
Sub transf. Pri. winding (198V, 60Hz)
3782
4294
31.2
85
E
*) Temperature rise limits for Singapore is 10K less
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