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17 Overload protection of transformers and associated circuits1 S( P: r2 y* E) `8 S' k: H! z
Appliances incorporating circuits supplied from a transformer shall be constructed so that in: \& |* E# x8 A0 A
the event of short circuits which are likely to occur in normal use, excessive temperatures do
" S% M# {# ?+ z1 v- pnot occur in the transformer or in the circuits associated with the transformer.
& y8 l- ?4 J1 P$ [* VNOTE Examples are the short-circuiting of bare or inadequately insulated conductors of accessible circuits
9 L1 b9 ?! t0 p0 F; F: L: J0 E5 O, ?( Uoperating at safety extra-low voltage.
$ D- h" M! f0 l2 B! s3 T2 ] l) cCompliance is checked by applying the most unfavourable short circuit or overload which is
7 J: V; h+ S8 t! k+ b$ K9 F7 Vlikely to occur in normal use, the appliance being supplied with 1,06 times or 0,94 times rated
: I) H6 _7 O! U5 G3 t# z6 Z0 xvoltage, whichever is the more unfavourable. Basic insulation is not short circuited.
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; d3 a: ]2 U* h1 t特殊标准好像有补充 |
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