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|
|  DSH 386& y* K- b G g I9 v5 b5 B
+ D1 ]$ P, K; U8 K% l
| Overload of Transformers
' ^) R. y) w" z B | 5.4.3 (5.3.3) and App. C1) g- D' M8 @- ?! B/ @) k% l9 Q
| 60950(ed.2) & 60950(ed.3)
1 Y$ e$ Y8 C$ v! Z' I4 U: Z; ? |
2 ]; H, F; Y `0 |Standard:% v# P; a; J* v! w
IEC60950, 2nd (3rd) edition
( r7 `! g- M: t+ g% G. t6 kSub clause:% O& }- \6 B' p, U
5.4.3(5.3.3) and App. C1
/ z& O1 E" O/ CSheet n. 386) b% ]/ K: h t1 ~
Page 1 (1)
. C9 p. n% t2 Z- }0 ^' fSubject:
. B' L( n. j. Y* P8 mOverload of Transformers
1 B: A2 M8 {, i' k, U. T0 e* VKey words:+ D; S) [5 x" F/ n) m
-Transformers- `9 _/ k" J, B* W; R: O# \4 ~
-Overload
: u N' O l/ Y) _Decision confirmed, O6 e9 L" I0 w3 f% e) T. I
at CTL 38th meeting
# y- j# w' q5 g# l& _Question:! \+ _2 b& W# L* d" m, a
How do you perform the overload test on a transformer used in a switched mode power/ j7 |9 G F& }5 d2 W
supply? Do you agree with the following procedure?
; L4 T( ?2 W' ~% }A power supply output-circuit shall be loaded with the worst normal load while overloading# ^+ S6 X9 {( r2 \2 Q) Q
that secondary winding which supplies the output-circuit.
/ _* S* }# j9 h7 L) [/ CDecision:
) E4 i/ F; t2 lThe load condition at the output of the switched mode power supply which causes the' ?3 W* g' P7 j* U
greatest heating effect shall be used. The load is not likely to be a short circuit# a/ [, Z5 L# L+ ^
3 p" A2 `" ~1 j, r- q. I& F' y" q+ v# ~3 C3 g: [2 N
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发表于 2012-11-6 17:20
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