PDSH 1021 Short circuit and overload protection

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PDSH 1021

Short circuit and overload protection

15.2 + P" G; c6 b& o; U; w

61558-1(ed.1);am1 & 61558-1(ed.2);am1

. x1 A" J4 J) q% l0 ]/ RStandard(s):
IEC 61558-1
8 O2 T  {- D- x! I( D% EAll editions
Subclause(s):
. K( |3 G" Q( a15.2
No. Year
  D, c6 A" N* uPDSH
7 B9 p. Z( q* Z) E6 f8 F1021 2010
  S1 ~: L8 c, H5 |" e, I; hCategory: SAFE Developed by: ETF5
OSM/LUM
Subject:
Short circuit and overload
/ W3 U9 e( T+ Q6 o3 i) |' qprotection
' {# o  x* F3 _5 ~- W: z3 ^$ hKey words:
/ ]2 m3 b6 K9 q4 i1 P- Transformers
% Q% u5 d- O+ T: u+ V; O5 o& I- Steady state conditions
: B2 u$ |% |7 X8 C- y9 b6 a* @- Short circuit
; |5 m  v, b2 \To be approved at the 49th
CTL Plenary Meeting, in 2012
* K' ?; z! a5 @. S1 N; P) j7 T' z0 M) ]Question:
+ i2 i& T  t# w+ O/ l' WInherently short-circuit proof transformers shall be tested by short-circuiting the output windings until
steady-state conditions are reached.
, X$ p' Y9 Z7 j7 j6 S, Q& i- 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)?
" X' C& i* N. s5 ]9 t5 E9 NHow shall an inherently short-circuit proof transformer be assessed when the above mentioned
: k- c6 ^7 B3 w  Y( \  w7 \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
5 a# H% v# p1 q5 ninsulation class of the transformer.