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17 Overload protection of transformers and associated circuits
( ?7 K4 k) D( V' [2 N. X( N6 r0 vAppliances incorporating circuits supplied from a transformer shall be constructed so that in; h" p( c* Y x3 m/ U5 _4 _
the event of short circuits which are likely to occur in normal use, excessive temperatures do
) f! j9 r% R8 v! |% {not occur in the transformer or in the circuits associated with the transformer.
- k. f- l( d" v" m" K0 R6 T! ~NOTE Examples are the short-circuiting of bare or inadequately insulated conductors of accessible circuits
0 F9 | h, V8 |, \, V. V; hoperating at safety extra-low voltage.
) @3 }0 a0 g, x1 K4 ^Compliance is checked by applying the most unfavourable short circuit or overload which is
7 }! p4 z8 C* F5 n. ]' {6 [2 Flikely to occur in normal use, the appliance being supplied with 1,06 times or 0,94 times rated
' }. t" D2 | l, m% B+ h% c! Rvoltage, whichever is the more unfavourable. Basic insulation is not short circuited.
; Y) B; a5 @, O p, g- N
- n6 v" V0 q( O' r6 o特殊标准好像有补充 |
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