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|  DSH 386
! M4 {+ G; c, o7 M; R5 Y
( d/ c- @( j' c9 t1 x5 E | Overload of Transformers
- U9 N1 s+ Y7 L% f8 ?2 [; |# u5 E | 5.4.3 (5.3.3) and App. C1
; b( O3 Q, {; C5 ? | 60950(ed.2) & 60950(ed.3)
3 @. t( h* v7 F( g$ i |
# H% p% A" _$ gStandard:" r' r2 u. l5 T: y& u/ L
IEC60950, 2nd (3rd) edition, D7 P3 S D7 n! e
Sub clause:
1 g$ J) @4 s: w6 X m5.4.3(5.3.3) and App. C1
9 A# w ?5 U2 a+ YSheet n. 3860 y" Z) c+ K) D3 _
Page 1 (1)
. A: h5 p# a( Z: v* i# }2 l$ ]Subject:
8 ^3 |$ g! C+ |8 m% OOverload of Transformers3 Q8 m7 e- w# b7 V4 G0 B* N: `
Key words:6 G0 w2 U* J: C, r; Q8 |+ E$ u. j
-Transformers* |( W/ Z$ W2 `/ Z' Q4 O8 \5 u* p
-Overload7 F, y) O/ n$ s; c+ @
Decision confirmed
# w6 d8 \( z/ }) V/ Rat CTL 38th meeting& C+ l$ d: s& w- W, z+ Z) b
Question:" X; u8 d5 w% m. x4 p# \1 L3 B" Z
How do you perform the overload test on a transformer used in a switched mode power1 q* U, H/ y# T& L! y9 | T3 w
supply? Do you agree with the following procedure?( S& y, T6 b% T5 ~8 l/ f: \: z
A power supply output-circuit shall be loaded with the worst normal load while overloading
u5 @' m; m2 I" R4 [) zthat secondary winding which supplies the output-circuit.* w* U1 S3 K! Y+ Y
Decision:4 {) u7 w- S' w
The load condition at the output of the switched mode power supply which causes the4 } H( C* c7 T# y0 D, A
greatest heating effect shall be used. The load is not likely to be a short circuit ^0 W' F, G' r$ b
% z* n6 u1 q$ Y" p! m" T& G+ _) D) k+ z# z
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发表于 2012-11-6 17:20
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