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17 Overload protection of transformers and associated circuits( y! A+ r1 X1 ?1 v8 K! w
Appliances incorporating circuits supplied from a transformer shall be constructed so that in
9 m( g" t3 B# X5 W4 j4 y, {* ethe event of short circuits which are likely to occur in normal use, excessive temperatures do! h) K8 S: g" X ^/ W9 x4 g+ j% n
not occur in the transformer or in the circuits associated with the transformer." p: {$ a$ C/ N6 Y$ }
NOTE Examples are the short-circuiting of bare or inadequately insulated conductors of accessible circuits7 i: t/ j- y2 l
operating at safety extra-low voltage.% ~( m& j% K7 X* H: ?
Compliance is checked by applying the most unfavourable short circuit or overload which is
" B4 s! z7 Q! W/ `0 ]: Xlikely to occur in normal use, the appliance being supplied with 1,06 times or 0,94 times rated
# n9 Y* S* Q" I L9 ^+ D9 P `$ wvoltage, whichever is the more unfavourable. Basic insulation is not short circuited., M' F2 z/ |8 x; h0 A
& @# J4 b" ^% `
特殊标准好像有补充 |
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