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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。
5 Z+ s6 n! }9 y$ V: P& t- X; d" `& ^* [1 P3 O0 G) x5 z9 {
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）
E- l. E3 j2 h0 NThe term "conductive part" refers to an electrically conductive part that is3 L4 @6 W% N. {: {* B% V' E' a3 u
– not normally energized, and8 [6 J- b; K; i2 D
– not connected to any of the following:! O4 p: D" u4 J7 l, d% W/ S
• a circuit at HAZARDOUS VOLTAGE, or
8 v1 R/ g) b5 c, z+ t8 X \• an ELV CIRCUIT, or% j3 k$ U! j7 g9 w4 a/ R( m
• a TNV CIRCUIT, or! \1 O# h+ q. f' |1 a
• an SELV CIRCUIT, or
2 p0 `5 W/ e9 r% t. W: t• a LIMITED CURRENT CIRCUIT.
$ B4 Z7 q' v8 R; }0 O2 t, MExamples of such a conductive part are the BODY of equipment, a transformer core, and in some cases a: w/ Y8 e4 g& z+ |& N0 B5 h: Y! ~
conductive screen in a transformer.
4 P$ Z0 A% T6 \/ W& ~% v, fIf such a conductive part is protected from a part at HAZARDOUS VOLTAGE by:
4 N$ a* K e* r– DOUBLE INSULATION or REINFORCED INSULATION, it is termed a "double-insulated conductive part";
( L' M+ s0 G' i) w8 H– BASIC INSULATION plus protective earthing, it is termed an "earthed conductive part";6 ]/ y7 K+ n) M, ~& B
– BASIC INSULATION but is not earthed, that is it has no second level of protection, it is termed a "basic-insulated
" m% X5 [$ k+ R/ Econductive part".: u: h5 {1 R* B* R, z7 V* C: P. N
A circuit or conductive part is termed "earthed" if it is connected to a protective earthing terminal or contact in
5 X) A" n( D$ @' l% \9 v. usuch a way as to meet the requirements in 2.6 (although it will not necessarily be at earth potential). Otherwise5 @% V+ Z# c- ^3 ? s
the circuit or conductive part is termed "unearthed". |
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