PDSH 1021 Short circuit and overload protection

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PDSH 1021 % k1 ~3 A* C5 o$ ?+ e1 d: Q

Short circuit and overload protection

15.2 " B* w) f2 O4 W

61558-1(ed.1);am1 & 61558-1(ed.2);am1 ( s9 k9 l) j0 `: g! F- U

7 J& p  q, H+ w2 O/ }& oStandard(s):
5 {% Q" U, x" T6 IIEC 61558-1
All editions
Subclause(s):
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9 h9 w. W2 Q) ~5 M  r. W, U6 a3 M) e( xNo. Year
PDSH
1021 2010
Category: SAFE Developed by: ETF5
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Subject:
- _& U6 \; X3 e5 kShort circuit and overload
7 e7 v0 m6 ?; P# U) E2 tprotection
3 O6 ~* y2 f. r( E4 r3 B. [. PKey words:
- Transformers
  I# {. ]. h5 N- ~0 t" R$ l# J- Steady state conditions
6 @' p* [; R+ i3 G- Short circuit
To be approved at the 49th
- ?; Q* O3 Q& O1 F5 e, n) U/ o. PCTL Plenary Meeting, in 2012
5 V. n3 ~' I0 i0 [. b4 ?* `Question:
Inherently short-circuit proof transformers shall be tested by short-circuiting the output windings until
steady-state conditions are reached.
( ~4 T( S9 J1 W5 yIn the IEC 61558-1 “steady-state condition” is not explained. Referring to other standards for the meaning
! r3 w* p# p+ q# C; B; m. P8 J- ^of “steady-state conditions”. Or “thermal stability”. The thermal stability is the change of temperature of
, o* \% |. Y/ s% E' pless than 1°C per hour. So the following questions arise:
: z; \) ^. o. ]) [3 p) Z) t; ?$ uIs it correct to record the temperatures after one hour when temperatures didn’t change (more than 1°C/h)?
" J& F2 T1 H5 bHow 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
7 q0 ^3 m& T8 o0 q& Za way where safety will be impaired (the transformer bursts).
" V5 A7 O/ q( Q6 X! a+ RDecision:
# j0 [0 c$ Z: K: r. W8 S' bYes. The transformer should not be accepted because the insulated materials are not corresponding to the
6 W7 a& i) }* }) f+ p8 d2 finsulation class of the transformer.
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4 I1 y! A7 n# n3 {1 Q) ~7 b
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