PDSH 1021 Short circuit and overload protection

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PDSH 1021

Short circuit and overload protection 2 R: @: T" `$ f7 S

15.2

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

+ P: K  \0 k6 zStandard(s):
6 P. o1 x& B! N. C. xIEC 61558-1
All editions
Subclause(s):
15.2
No. Year
PDSH
1021 2010
: s0 m& D& y$ g& a6 s+ FCategory: SAFE Developed by: ETF5
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7 ?$ g0 T% n. e  G" Z. ZSubject:
Short circuit and overload
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Key words:
- Transformers
7 b& k' `* n6 i7 }% V1 y- Steady state conditions
- Short circuit
9 x3 Z( `2 U- d! ^, O/ f# WTo be approved at the 49th
CTL Plenary Meeting, in 2012
Question:
" N4 c$ H# }$ ^# _Inherently short-circuit proof transformers shall be tested by short-circuiting the output windings until
steady-state conditions are reached.
4 _( ]3 o4 ~( k" U: QIn the IEC 61558-1 “steady-state condition” is not explained. Referring to other standards for the meaning
# i+ L: H* h) x1 Gof “steady-state conditions”. Or “thermal stability”. The thermal stability is the change of temperature of
+ V4 ?) V. v( R' `4 q- m" W' Bless 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)?
How 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).
7 Y" d( }* t% d- V( f' ?3 ?6 m5 f* h, hDecision:
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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