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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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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)
4 f n* t0 P. H- J' p1 x# \, XThe term "conductive part" refers to an electrically conductive part that is+ z% a' g" B [# \
– not normally energized, and
% }& U$ _$ A. M! P* h( n– not connected to any of the following: F7 H. G1 U1 B
• a circuit at HAZARDOUS VOLTAGE, or
% s7 y+ }% K8 {$ [6 G0 O• an ELV CIRCUIT, or
3 q. [& n* k& G• a TNV CIRCUIT, or1 t$ t- {8 J! |) @2 y
• an SELV CIRCUIT, or
; b5 a- `% Q5 _: L m• a LIMITED CURRENT CIRCUIT.
( v8 q+ u& `$ B8 ]: a8 n7 Y& vExamples of such a conductive part are the BODY of equipment, a transformer core, and in some cases a9 Q( y% w/ `3 o! Q1 k
conductive screen in a transformer.
' u( V! Z. Y9 M' t, h4 JIf such a conductive part is protected from a part at HAZARDOUS VOLTAGE by:
: @% {- w/ X: t– DOUBLE INSULATION or REINFORCED INSULATION, it is termed a "double-insulated conductive part";
, r9 F2 R3 v, m6 w9 X– BASIC INSULATION plus protective earthing, it is termed an "earthed conductive part";) W; g: L; | @: H
– BASIC INSULATION but is not earthed, that is it has no second level of protection, it is termed a "basic-insulated- Y; o3 H: i, J7 N0 Y
conductive part".. B H0 J- N7 a. a( n5 q" u
A circuit or conductive part is termed "earthed" if it is connected to a protective earthing terminal or contact in/ F& N! |# p% f8 u
such a way as to meet the requirements in 2.6 (although it will not necessarily be at earth potential). Otherwise9 M# \4 K% _" k9 Y) }
the circuit or conductive part is termed "unearthed". |
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