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17 Overload protection of transformers and associated circuits
8 t1 U% s+ y3 F5 L b! L, O% oAppliances incorporating circuits supplied from a transformer shall be constructed so that in8 W4 Z3 [ m: D( c
the event of short circuits which are likely to occur in normal use, excessive temperatures do
c! g4 A* R; D5 ?8 Z2 B& c1 E7 ^+ wnot occur in the transformer or in the circuits associated with the transformer.
5 N9 N+ |7 N) j+ q: J! WNOTE Examples are the short-circuiting of bare or inadequately insulated conductors of accessible circuits8 {7 ^/ Z5 T& F& V" B
operating at safety extra-low voltage.
. q3 I' Z4 S9 v( rCompliance is checked by applying the most unfavourable short circuit or overload which is4 Z4 v3 L" [ o6 f: p/ S
likely to occur in normal use, the appliance being supplied with 1,06 times or 0,94 times rated
) d7 ^ h p% @voltage, whichever is the more unfavourable. Basic insulation is not short circuited.
$ B8 _3 n4 z: X3 D- w6 W2 [2 o: c
特殊标准好像有补充 |
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