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如果从标准61558 字面意思来看,% N. r/ \; w+ y* q/ \
19.17 Transformers having a protection index from IPX1 up to and including IPX6 shall; z9 I2 J$ y6 b! ^
have an effective drain hole at least 5 mm in diameter or 20 mm2 in area, with a width of at# J* g! c1 ~+ p- g9 a" R, C c# ^
least 3 mm.
: [* M* I! q, dThe drain hole is not required if the transformer, including its windings and core and all
$ i( t! o" [+ N1 q9 vuninsulated live parts, are completely embedded in an appropriate potting material.% I0 a* H5 X* L: o# N+ F! f
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最后一段,线圈、铁心 和所有没绝缘的带电体,都要完整地覆盖 |
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