PDSH 1021 Short circuit and overload protection

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PDSH 1021 & w+ K/ i- J& z* ?2 H; n& r) } 6 k' ~; O8 B$ [

Short circuit and overload protection 8 F) L( M8 W0 a5 k2 W) ?  p( C; H

15.2   |5 \' K8 F1 B8 G2 l

61558-1(ed.1);am1 & 61558-1(ed.2);am1 / {7 D  u2 w4 @

Standard(s):
IEC 61558-1
All editions
Subclause(s):
9 M$ i: q* X" d15.2
No. Year
4 b4 K1 t4 ^3 S4 ^1 P. oPDSH
5 Q! v1 H0 O1 b: S7 L# U1 p* ~4 ?: k1021 2010
Category: SAFE Developed by: ETF5
- T: l; Z) L* P! z# ROSM/LUM
Subject:
7 s) |) H: r% E  L; }, U% {. EShort circuit and overload
protection
Key words:
- Transformers
0 |3 o1 q( ]% |% `! B3 J3 y% ~: Y1 _- Steady state conditions
& u1 \/ h+ q+ _- Short circuit
To be approved at the 49th
' s. E; ^& \/ O/ ]+ sCTL Plenary Meeting, in 2012
Question:
Inherently short-circuit proof transformers shall be tested by short-circuiting the output windings until
steady-state conditions are reached.
! L! F3 j/ v  r" L' c) d& [In the IEC 61558-1 “steady-state condition” is not explained. Referring to other standards for the meaning
2 R1 P) i  S* |- g6 C- J! k+ pof “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)?
: w( }% h/ ~2 G/ p& ^! AHow shall an inherently short-circuit proof transformer be assessed when the above mentioned
6 `) m$ Z) g/ Vrequirements are fulfilled, but the transformer is damaged 6h, after reaching the steady state condition, in
* s! X  H5 X, Y! g- `0 Aa way where safety will be impaired (the transformer bursts).
$ O+ `2 k4 r2 B$ ^4 \Decision:
Yes. The transformer should not be accepted because the insulated materials are not corresponding to the
insulation class of the transformer.