|
|
|  DSH 386
* h+ ~% x6 q! {3 t' [
& o3 E2 j6 I' `& E. a5 H6 I | Overload of Transformers. ?& _+ g$ J- k8 h0 ^+ L
| 5.4.3 (5.3.3) and App. C18 w1 u5 W$ Q N5 D P8 \5 {: y
| 60950(ed.2) & 60950(ed.3), E- w) l, Z+ B8 |5 Y' }* H& L" s
|
. _- [9 _$ x# e' o4 x
Standard:2 K5 b) D3 @6 B0 {
IEC60950, 2nd (3rd) edition% g& }& y6 Q& G! y
Sub clause:( k7 ?) }7 Q, M t. _
5.4.3(5.3.3) and App. C1
5 ?: s6 ^2 N; c) WSheet n. 386. y% z& a" j# Z! N# Y+ \; ?: K
Page 1 (1)9 s9 G ~/ X) L1 d' f4 f \
Subject:
2 F1 U6 w4 M( N5 \1 J* M) }Overload of Transformers
s& q/ a# I# E% H: G6 o- NKey words:
( M" D) u( _0 ?, c-Transformers3 ?7 H% o. k$ ], U. X6 V$ V
-Overload
1 B6 y+ d5 {! a. h! m ZDecision confirmed
5 [* u" `. [0 N2 M1 S( i# lat CTL 38th meeting
: h3 P& j7 P. l( _* C+ F! S+ aQuestion:% u% k: I4 r8 s1 p% @2 g
How do you perform the overload test on a transformer used in a switched mode power, `5 }9 I4 B7 ^ l
supply? Do you agree with the following procedure?
# d, j$ y3 X" c$ ^0 sA power supply output-circuit shall be loaded with the worst normal load while overloading* y7 x# d" Y! e; `( v
that secondary winding which supplies the output-circuit.7 X- i' u& N" P4 X6 l- m; L; O
Decision:
5 y" ?1 x2 n/ ?4 \. X5 oThe load condition at the output of the switched mode power supply which causes the( ?8 w A" v7 \& o( l, b5 L2 q
greatest heating effect shall be used. The load is not likely to be a short circuit/ `* S& }) C* n* L5 V" Z# u4 ?' `
, Z: u1 a4 T3 i' S; A1 {% y+ [1 j7 c6 ^! K
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发表于 2012-11-6 17:20
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