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|  PDSH 1022
( M. q) b; x. \8 K2 Z: n
8 V& m$ _9 @+ M g, ~$ w | Short circuit and overload protection% z- D- X) x- l8 v. w, u% K9 k
| 15.3.2
+ R+ T9 v( W% i/ N5 X9 f | 61558-1(ed.1);am1 & 61558-1(ed.2);am1& [2 ?$ L& F6 I
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; V, h2 u/ [* h; N, S5 uStandard(s):
- N6 B. _9 @, U9 B1 J2 A7 dIEC 61558-1& N0 Q* `7 d1 E3 w
All editions- U. H$ ^$ U" s) E b; F! u
Subclause(s):) H w6 e4 [8 O( d# `9 C
15.3.2$ F' o3 j$ t7 {2 Y4 e3 e+ k6 m
No. Year+ t! Q8 z2 e) H k4 q
PDSH4 L/ L! m1 ~7 D# c4 F. U
1022 20108 e8 T9 _3 H1 |. d) U" Z5 `# h9 p! y
Category: SAFE Developed by: ETF5
7 g8 C/ w1 S( m. X9 g U% QOSM/LUM
I% Z3 w7 i" ^) f8 B7 ~- B; @% zSubject:+ C% r. t( T+ Q6 X- c t6 T: j
Short circuit and overload
" w9 V/ x0 w3 o7 P" M4 b( B+ h! Kprotection
0 n+ P9 G# b" t( P5 tKey words:
! ~$ k6 h9 v3 n* `2 _3 M3 C4 U- Fuse current
0 M; R N* L- I+ R6 q N- Overloading test4 {, T- W! ~# h( E( }
- Overload current
$ u! P! k4 `. t& S5 lTo be approved at the 49th' q& K' a9 Z+ B4 d) _$ _( U
CTL Plenary Meeting, in 20129 G- P& T7 Y4 z3 }9 D
Question:" k7 }2 q- y* o( _
During the overloading test on the transformer according to § 15.3.2 the temperature of the windings and
8 F& p7 T8 X ctheir resistance increase and consequently the overload current decreases. Has the fuse current be
0 l9 M8 @' s# F8 p* a* s9 Qreadjusted to the original overload current during the test or no adjustment has to be made?/ H% p' N, Y8 b4 d9 a& n, a$ T8 Q# L
Decision:/ A" e% ?/ X) J" M, y& A
The fuse current has to be kept constant during the test.
/ z1 _6 _) x [7 s- y/ G- |$ {+ S: h. C& j& q$ C0 J( h# U' J: q" ?9 @1 [
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发表于 2012-11-8 15:15
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