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|  DSH 386
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* [% O- R. i. m z, y9 v, N# ? | Overload of Transformers
2 X! a" w) X4 Y! K- }/ Q | 5.4.3 (5.3.3) and App. C1
* v w9 \2 [9 ]8 E, s3 D! L | 60950(ed.2) & 60950(ed.3)
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# b1 \( w- r6 G# V5 G$ `( \Standard:
. z4 N( O" f) q# l8 e/ uIEC60950, 2nd (3rd) edition
/ J+ J8 F8 W( a$ S$ k I+ A/ R$ ySub clause:) {+ G) ~! D% r* q3 S6 g; I
5.4.3(5.3.3) and App. C1
( F3 y0 `' N. T7 q# R, qSheet n. 386
: q8 [- D/ ] U: D6 E* Z1 `Page 1 (1)9 n; M. ], ] E) n# J# U; D
Subject:& J$ R7 |" m* |
Overload of Transformers2 i' d+ J% G: i4 U- d# ?
Key words:
2 ]& w) A% x& ^7 Y-Transformers
! H- v, L' [ d0 P9 n( l-Overload6 Z; Z9 f ?6 V( d# T" w
Decision confirmed
6 s: C5 c3 K" w8 Wat CTL 38th meeting
; |+ ` B+ v7 O2 f- c- b; B4 fQuestion:
' A, O8 k1 P! ~4 o, K' v0 a3 nHow do you perform the overload test on a transformer used in a switched mode power) ?7 S3 p5 s8 f9 _/ B; }. ] L
supply? Do you agree with the following procedure?& j8 e# Z2 }: E5 o# H' _
A power supply output-circuit shall be loaded with the worst normal load while overloading
9 p) u' J) G8 ~3 R; G. Gthat secondary winding which supplies the output-circuit.4 Q, F/ M& p2 q. P! ?' Q1 Q
Decision:
& |* }7 K5 W* A, V. ?& A0 KThe load condition at the output of the switched mode power supply which causes the
5 D3 S+ G. @. d% n0 G! s. ?greatest heating effect shall be used. The load is not likely to be a short circuit o: Z6 h k! I5 c' I
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