3 L e M* o2 l/ f6 o8 v" f; j6 H功能性绝缘的定义： ; S6 O: Q& S3 z, m. E6 }9 H! r 5 B E* C6 P O8 y2 ~5 J/ r$ d3.3.5- Q% R. N+ s7 T, q
functional insulation r" P1 ^" S! }insulation between conductive parts of different potential which is necessary only for the proper functioning of the appliance。 ! d: y: ?8 I* `' e3 a2 E2 _0 e- v8 j3 j. c3 F+ K
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功能性绝缘的电气间隙的要求： 4 X% r: m. I' ]2 H/ m+ l# c) D* u$ O2 y1 \5 ?9 p9 b5 c; x8 B7 ]
29.1.4 8 a5 Z, C$ l5 B6 YFor functional insulation, the values of table 16 are applicable. However, clearances are not specified if the appliance complies with clause 19 with the functional insulation short-circuited. Lacquered conductors of windings are considered to be bare conductors. However, clearances at crossover points are not measured.6 v! K# X! B3 B7 V3 v8 j
4 b. e5 Y9 A4 V5 p看蓝色字体部分，只要在短路时，能满足clause 19的要求，可不要求functional insulation 的电气间隙。 . v( [9 _+ b+ [5 O# l# H( K* z( s9 n! `
看红色字体部分，漆包线被视为“裸露导体”。也就是在本标准中，漆包膜不被视为功能性绝缘。这个前提很重要，这意味着绕组间不必进行“短路测试”。# }* o; \( m$ C# n/ C3 ^ t4 X
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功能性绝缘的爬电距离的要求：* _& f5 w% R! d/ H' H# c* w
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29.2.4 ' k0 D7 `( i$ V( i% [
Creepage distances of functional insulation shall be not less than those specified in table 18. However, creepage distances may be reduced if the appliance complies with clause 19 with the functional insulation short-circuited.3 ^/ ~+ H4 w7 \2 c1 @5 @$ n# ?# T
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