DSH 386 Overload of Transformers

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DSH 386 5 ~2 t  O" n' y! u + P1 a% T$ P. i% j2 U

Overload of Transformers

5.4.3 (5.3.3) and App. C1 $ _0 l- a$ [' j  G2 a4 Z

60950(ed.2) & 60950(ed.3) 3 r7 w2 L* Z3 p* w. [# N  C, Z" O

Standard:
) F9 ]( k1 s: IIEC60950, 2nd (3rd) edition
Sub clause:
1 @  X: F+ Q' ^% E2 ?' H8 R5.4.3(5.3.3) and App. C1
- O' i. z" W# r  \6 W1 w9 CSheet n. 386
Page 1 (1)
Subject:
Overload of Transformers
Key words:
3 q: F  Q- ^7 q* Q$ Y-Transformers
-Overload
' S6 L3 v/ N! R$ N/ ]2 hDecision confirmed
: `1 v4 H! g  V7 Q5 w- g. T- ?at CTL 38th meeting
Question:
: _% v: W2 ^; m) ^/ N" nHow do you perform the overload test on a transformer used in a switched mode power
7 t8 v2 D8 q3 S7 W: {: Vsupply? Do you agree with the following procedure?
+ H; N* L' ^4 b+ r0 J8 `; a& A1 _A power supply output-circuit shall be loaded with the worst normal load while overloading
' x  A( j; w& D  uthat secondary winding which supplies the output-circuit.
: D9 X' s! N& n) f9 gDecision:
3 b; P/ Q% S2 n9 t7 K5 d" jThe load condition at the output of the switched mode power supply which causes the
: \% F/ y; l; X% ~! [# Bgreatest heating effect shall be used. The load is not likely to be a short circuit
6 t9 E7 U/ @# P' G" x1 Q) O+ B
# l8 {0 Z) S; g$ d& h( p
* P8 m& y- Y: \! e/ i0 q