PDSH 1021 Short circuit and overload protection

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PDSH 1021

Short circuit and overload protection + K; b" F9 E4 B" X+ _) \6 ]

15.2 $ X/ e, c% C! j. Y' Y; j

61558-1(ed.1);am1 & 61558-1(ed.2);am1 2 J# O5 t, s; C, v/ s0 v" C

Standard(s):
IEC 61558-1
1 T# r: n) V( Y3 w2 gAll editions
* H6 \  D2 t: w# X( |* w  ASubclause(s):
15.2
No. Year
1 T. |* \- U* M& cPDSH
1021 2010
Category: SAFE Developed by: ETF5
OSM/LUM
% z2 W( N) O# }; g9 J! JSubject:
Short circuit and overload
protection
Key words:
7 G' k9 _, u/ L: v+ s% T- Transformers
3 M& Q, T1 y: P3 f* e2 C7 R5 I5 o- Steady state conditions
- Short circuit
4 m2 d' i& J$ v9 E% t, P; WTo be approved at the 49th
CTL Plenary Meeting, in 2012
0 M4 C( N! }, u- V" j+ R! OQuestion:
+ L  b: X2 o4 }. a+ tInherently short-circuit proof transformers shall be tested by short-circuiting the output windings until
2 `0 k( J5 S4 t% Isteady-state conditions are reached.
0 G2 x  t' g( I$ J' B: mIn the IEC 61558-1 “steady-state condition” is not explained. Referring to other standards for the meaning
of “steady-state conditions”. Or “thermal stability”. The thermal stability is the change of temperature of
less than 1°C per hour. So the following questions arise:
Is it correct to record the temperatures after one hour when temperatures didn’t change (more than 1°C/h)?
/ N" n6 I0 h6 \2 a- t3 UHow shall an inherently short-circuit proof transformer be assessed when the above mentioned
requirements are fulfilled, but the transformer is damaged 6h, after reaching the steady state condition, in
a way where safety will be impaired (the transformer bursts).
Decision:
Yes. The transformer should not be accepted because the insulated materials are not corresponding to the
insulation class of the transformer.
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