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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。+ o3 M. v/ s, n
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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)
; i1 B* f5 S2 X# m: nThe term "conductive part" refers to an electrically conductive part that is E2 W( |5 I# ~6 h% a: {, h
– not normally energized, and: y0 u8 ^! i& g7 n
– not connected to any of the following:
3 F3 c, K6 ?/ H( L- x+ C! u" r5 S; m• a circuit at HAZARDOUS VOLTAGE, or- [9 B" }" y3 p/ Q8 A9 F0 |7 R% ]
• an ELV CIRCUIT, or* F1 d& Y4 `; I" S0 l
• a TNV CIRCUIT, or
# O: m( G& z+ g( S: R0 s8 Z• an SELV CIRCUIT, or; B+ u) k7 {) |# u7 V0 g& X
• a LIMITED CURRENT CIRCUIT.* F. t1 a( R" n8 T3 @1 N
Examples of such a conductive part are the BODY of equipment, a transformer core, and in some cases a
, g% k# g* A' s& _1 L/ V2 }conductive screen in a transformer.
, q# [2 C# P: v) ^# L6 v7 EIf such a conductive part is protected from a part at HAZARDOUS VOLTAGE by:2 |' P. t0 G' _! p' Z! q
– DOUBLE INSULATION or REINFORCED INSULATION, it is termed a "double-insulated conductive part";
: l4 {/ O. j6 ?5 c$ D4 p– BASIC INSULATION plus protective earthing, it is termed an "earthed conductive part";2 d& f: k3 P; G' _ P
– BASIC INSULATION but is not earthed, that is it has no second level of protection, it is termed a "basic-insulated
+ M( p- W. h K S' H2 m9 K: v7 ~conductive part".5 `- H/ o5 f0 l8 }* D8 D4 Y0 r
A circuit or conductive part is termed "earthed" if it is connected to a protective earthing terminal or contact in
5 A$ p. `! ?' D" s( o2 n" Hsuch a way as to meet the requirements in 2.6 (although it will not necessarily be at earth potential). Otherwise
/ @( c5 |! m% _1 Vthe circuit or conductive part is termed "unearthed". |
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