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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。7 ^# }% f, Z. D5 q2 G
! h( G+ c7 `9 {+ k, L" x
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)$ Y0 h( _0 ^/ z! _- W, G! D( Q. E; e
The term "conductive part" refers to an electrically conductive part that is
! m2 O9 I/ b7 v* N/ ]1 {– not normally energized, and
1 U N) ~' U( C( ?! Y+ Q" g– not connected to any of the following:1 u" s0 `5 }# C/ S- v; ?/ R/ O
• a circuit at HAZARDOUS VOLTAGE, or
0 r! H; q4 A0 W( R. Y. O7 h8 a3 G• an ELV CIRCUIT, or$ D% p* p2 O% {. [
• a TNV CIRCUIT, or
) \+ g8 H) b/ L2 C0 A• an SELV CIRCUIT, or
( A' S/ t6 J! ?+ Z* }( N* J0 U7 P• a LIMITED CURRENT CIRCUIT.
) h) z. `2 i. ]& N* k2 DExamples of such a conductive part are the BODY of equipment, a transformer core, and in some cases a) d4 K1 R& m b3 ~
conductive screen in a transformer. ]3 c& }7 Z; F* t& p( _' p
If such a conductive part is protected from a part at HAZARDOUS VOLTAGE by:* `# d( c& ^5 P+ Y- b! H5 t
– DOUBLE INSULATION or REINFORCED INSULATION, it is termed a "double-insulated conductive part";
Q$ x2 Q$ G. C4 g% O5 A– BASIC INSULATION plus protective earthing, it is termed an "earthed conductive part";
& p9 J0 Q1 y0 W- Z. r– BASIC INSULATION but is not earthed, that is it has no second level of protection, it is termed a "basic-insulated
7 m1 x6 a8 k' s7 U: {" Sconductive part".- r* O% ~2 _8 D# N. r. f
A circuit or conductive part is termed "earthed" if it is connected to a protective earthing terminal or contact in* ~( o- G1 L+ \5 e6 M* u _5 {! d1 c8 V
such a way as to meet the requirements in 2.6 (although it will not necessarily be at earth potential). Otherwise7 g! i( p: y& N$ r
the circuit or conductive part is termed "unearthed". |
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