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17 Overload protection of transformers and associated circuits
: s2 u% D! h6 B B5 oAppliances incorporating circuits supplied from a transformer shall be constructed so that in
# _4 K$ s. k7 |the event of short circuits which are likely to occur in normal use, excessive temperatures do
* O' D( J4 K0 E& B1 Knot occur in the transformer or in the circuits associated with the transformer.
. O a0 W* p6 U$ f$ D& JNOTE Examples are the short-circuiting of bare or inadequately insulated conductors of accessible circuits; R4 p0 g1 e5 W; w3 `0 ~
operating at safety extra-low voltage.
7 A4 _+ y* }7 R) Z2 v' SCompliance is checked by applying the most unfavourable short circuit or overload which is0 ~6 |; n8 B0 v2 S
likely to occur in normal use, the appliance being supplied with 1,06 times or 0,94 times rated% Q; r! X5 d/ B% ~
voltage, whichever is the more unfavourable. Basic insulation is not short circuited.
, Q8 j! K+ \( A6 e. ]: }& |0 |& l) ^1 _- ^/ ~, E6 w6 c: U2 C4 E; b" w
特殊标准好像有补充 |
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