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TECHNICAL REPORT CSQ
CSQ n° 9101.TESA
Certificazione sistema di Qualità
ISO9001
POWER TRANSFORMER pag. 1/15
Page 1 of 15
Ability to Withstand Dynamic Effects of Short Circuit
Comparative Statement
DATA: 28/03/10ISSUED BY APPROVED BY
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TECHNICAL REPORT CSQ
CSQ n° 9101.TESA
Certificazione sistema di Qualità
ISO9001
POWER TRANSFORMER pag. 2/15
2
Ability to Withstand Dynamic Effects of Short Circuit Comparative Statement
The IEC 60076-5 standard gives the comparison criteria to verify the applicability of a short-circuit withstand
test performed on a transforer to a similar transformer. The technical feature to be taken into consideration are
prescribed in the Annex B “Guidance for the identification of a similar transformer” and showed in Table 1
below.
Tesar has positively tested a Cast-Resin Transformer 2500 kVA at CESI Laboratory (test certificate n.
A7030507 dtd 3rd
Ddecember 2007):
This test certificate is applicable to the transformers having characteristics according to the content of Table 1
and Table 2
Table 1
Critical features as per IEC 60076.5 Tested Transformer 2500
kVA
Similar Transformers
same type of operation: distribution type distribution type
same conceptual design: cast resin, core type with
concentric and circularwindings
cast resin, core type with
concentric and circular windings
same arrangement of main windings and
geometrical sequence
HV : cast
LV: pre-preg
Geometrical sequence :
HV outside , LV inside
Same as the tested transformer
same type of winding conductors Al Same as the tested transformer
same type of main windings layer for LV and HV coils layer for LV and HV coils
absorbed power for at short circuit between
30% and 130% of that of the reference unit
from 12.038,52 up to
52166,93 p.u.
≤ 52.166,93 p.u.
axial forces and relative winding stresses at
short circuit not exceeding 110% of those in
the reference unit
as per design Transformers in Table 2 have
forces and stresses within the
limit required
same manufacturing process HV : cast
LV : pre-preg
Same
same clamping and supporting arrangement Correlated to the short
circuit current
Same arrangement , correlated to
the short circuit current
Table 2
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TECHNICAL REPORT CSQ
CSQ n° 9101.TESA
Certificazione sistema di Qualità
ISO9001
POWER TRANSFORMER pag. 3/15
3
Tested transformer
Rated Power [kVA] 2500
Impedance [%] 6,23
Absorbed power at S.C. [pu] 40.128,41
Range 30% [pu] 12.038,52
Range 130% [pu] 52.166,93
Similar transformer
Rated Power
Rated
Impeda
nce
Absorbed
power at
S.C.
Impedance
min
Impedance
max
[kVA] [%] [pu] [pu] [pu]
500 4 12.500,00 0,96 4,15
630 4 15.750,00 1,21 5,23
800 6 13.333,33 1,53 6,65
1000 6 16.666,67 1,92 8,31
1250 6 20.833,33 2,40 10,38
1500 6 25.000,00 2,88 12,46
1600 6 26.666,67 3,07 13,29
2000 6 33.333,33 3,83 16,61
2500 6 41.666,67 4,79 20,77
2700 6 45.000,00 5.17 22,43
3000 6 50.000,00 5,75 24,92
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