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变压器磁是可以做为初级元件来处理的,这种情况多用于开关电源产品内的高频变压器。
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. k2 t' \ Z5 [0 p, m; K在标准中的Table 2H中有对此种情况进行了说明。见下文(摘录于标准)8 P8 ~5 Q' ?4 n) O8 ~2 L3 \: b1 u
The term "conductive part" refers to an electrically conductive part that is/ ~- Q$ \: i% w
– not normally energized, and( u7 p" D* d* {8 O
– not connected to any of the following:# t& T& h, u, U8 n; U6 Y
• a circuit at HAZARDOUS VOLTAGE, or4 g8 F1 _. o( y0 K
• an ELV CIRCUIT, or
9 r, \' v& V. W( q. v: o% g• a TNV CIRCUIT, or0 t9 N& T! N7 x1 y6 E
• an SELV CIRCUIT, or U+ K: `1 y# m$ ^7 A) h5 ^
• a LIMITED CURRENT CIRCUIT.9 R* i! V& ]# V! Z1 _6 P8 `, l
Examples of such a conductive part are the BODY of equipment, a transformer core, and in some cases a: F1 A F3 D0 M" x
conductive screen in a transformer.& [# `! w! o9 e) z2 N
If such a conductive part is protected from a part at HAZARDOUS VOLTAGE by:# a) e' K. \: f5 R% k
– DOUBLE INSULATION or REINFORCED INSULATION, it is termed a "double-insulated conductive part";" I+ I& Z; g* k" L$ `) A
– BASIC INSULATION plus protective earthing, it is termed an "earthed conductive part";( `8 m) Q; ~' [& m; k6 ]' J* t6 s
– BASIC INSULATION but is not earthed, that is it has no second level of protection, it is termed a "basic-insulated
0 K; U' B0 |' ~3 Q( q2 bconductive part".5 t- O8 }; v" }0 d4 ]2 i
A circuit or conductive part is termed "earthed" if it is connected to a protective earthing terminal or contact in
& E$ r& T$ w1 m/ @1 Z/ K' qsuch a way as to meet the requirements in 2.6 (although it will not necessarily be at earth potential). Otherwise
. @/ p) n, M' h. mthe circuit or conductive part is termed "unearthed". |
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