PDSH 1021 Short circuit and overload protection

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PDSH 1021 % \/ }8 f" S0 h # z4 d5 x8 E; J! u1 o* F

Short circuit and overload protection 5 F' q9 X. `# Y

15.2

61558-1(ed.1);am1 & 61558-1(ed.2);am1   k; ?4 o/ N; I8 S" G) F7 ]/ _9 m

0 s: J& \0 \* aStandard(s):
/ Z6 i+ ?: G) l. h& ?% ZIEC 61558-1
All editions
$ c3 t. s5 ~6 b4 ^5 J2 TSubclause(s):
# y4 E2 d; u8 S0 D& v: M4 {" J8 `15.2
4 ]! b/ p& y% L' QNo. Year
PDSH
1021 2010
Category: SAFE Developed by: ETF5
OSM/LUM
; u9 @3 a" m# J& W7 L: X2 wSubject:
Short circuit and overload
0 c7 j9 }& d/ D: D# t3 T( K* A; kprotection
8 f$ t2 _) f* p$ E5 a# pKey words:
- Transformers
- Steady state conditions
0 {" v4 h2 V9 ]0 h: A, z- Short circuit
To be approved at the 49th
CTL 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.
In the IEC 61558-1 “steady-state condition” is not explained. Referring to other standards for the meaning
9 l$ q; ^. U0 x; T1 l+ aof “steady-state conditions”. Or “thermal stability”. The thermal stability is the change of temperature of
0 Z1 X: X- q$ }0 L7 t3 Aless than 1°C per hour. So the following questions arise:
+ E( o4 _$ |: k; F" FIs 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).
Decision:
1 }8 X" f: ?3 q6 r0 sYes. The transformer should not be accepted because the insulated materials are not corresponding to the
' J* H5 c4 R: O  Z' x, P! |7 _$ \* finsulation class of the transformer.