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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。
, G2 o) h! `) u/ c4 j8 ?- q* ~0 }; P, m, ~
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) v, U) L4 ~9 q' T2 Z
The term "conductive part" refers to an electrically conductive part that is
% M- U! O( P( R/ w5 q– not normally energized, and
: t' J* U; m: B3 o% r– not connected to any of the following:
7 M) Y! U( f! v) C• a circuit at HAZARDOUS VOLTAGE, or, M2 D" `. ^! B- i7 P
• an ELV CIRCUIT, or
5 D/ g2 Q* W9 m• a TNV CIRCUIT, or2 ^9 |' [7 b3 c: @' @
• an SELV CIRCUIT, or V( \# O* q/ p( |
• a LIMITED CURRENT CIRCUIT.
X+ r7 ~, I+ p1 l/ U8 ?. o" XExamples of such a conductive part are the BODY of equipment, a transformer core, and in some cases a
u5 X3 l3 X Y% M" C4 Sconductive screen in a transformer.) W8 B, L. a, u0 W/ h! z1 B
If such a conductive part is protected from a part at HAZARDOUS VOLTAGE by:
! l6 E% d/ X: B# H! |1 u– DOUBLE INSULATION or REINFORCED INSULATION, it is termed a "double-insulated conductive part";6 b& ^2 C9 C8 }8 L& ^; E
– BASIC INSULATION plus protective earthing, it is termed an "earthed conductive part";
' X1 Z$ {" s6 N% |– BASIC INSULATION but is not earthed, that is it has no second level of protection, it is termed a "basic-insulated* L3 W' P" I( y. X/ t+ g1 G
conductive part".+ {( I7 i/ ?1 h3 P* l
A circuit or conductive part is termed "earthed" if it is connected to a protective earthing terminal or contact in
+ i- p3 k2 w$ }such a way as to meet the requirements in 2.6 (although it will not necessarily be at earth potential). Otherwise
+ m7 |9 a& L; x; H! Fthe circuit or conductive part is termed "unearthed". |
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