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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。0 P6 x, X+ ]$ g& ?" T+ T% t
: K/ R1 t" Y1 U; _! x- h7 `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)/ O/ R) G2 |0 K- E9 C
The term "conductive part" refers to an electrically conductive part that is
! b: V$ X3 ]9 L# G/ _6 j3 a– not normally energized, and
y v) `0 B. p) R2 G9 ~/ Q– not connected to any of the following:; S0 i9 b' j2 u
• a circuit at HAZARDOUS VOLTAGE, or, a! X; ~: T* A0 w C# m% z
• an ELV CIRCUIT, or4 J; ]: W' I$ o
• a TNV CIRCUIT, or
' z" t. \. _% Q1 A5 T9 J [! z8 Y• an SELV CIRCUIT, or
h" v" o& q/ Q5 p• a LIMITED CURRENT CIRCUIT.2 P6 P* c% W" i9 b3 r
Examples of such a conductive part are the BODY of equipment, a transformer core, and in some cases a/ E. E2 n* u0 K0 w( l$ \! E3 B* P
conductive screen in a transformer.: J; x/ z# k& B { E; y
If such a conductive part is protected from a part at HAZARDOUS VOLTAGE by:& d3 J( }) p; x4 g- T
– DOUBLE INSULATION or REINFORCED INSULATION, it is termed a "double-insulated conductive part";
% X" t4 j1 d+ a8 v y; L3 z– BASIC INSULATION plus protective earthing, it is termed an "earthed conductive part";
& j' L p( }& d, Y– BASIC INSULATION but is not earthed, that is it has no second level of protection, it is termed a "basic-insulated* D* L& [4 Q" o. @( ?7 b8 I
conductive part"., W4 [1 K2 D5 X K8 H9 z
A circuit or conductive part is termed "earthed" if it is connected to a protective earthing terminal or contact in
, M- _2 O% O. a: q% _" D0 m/ j* Zsuch a way as to meet the requirements in 2.6 (although it will not necessarily be at earth potential). Otherwise
+ n5 }# _/ @: y* g1 {the circuit or conductive part is termed "unearthed". |
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