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以面两种情况OK
+ K/ R* v' ?0 P7 J% W* N* h1, 加一层厚于1mm的套管7 c: N6 Y; G' H8 F/ s A; |
2,加两层可套管(每层需分别可通过电气强度测试), h5 Z5 U& @/ J3 D
: b# h& y0 l5 a% L
标准要求如下:+ r1 V) D- t! j; A; Z
29.3 Supplementary insulation and reinforced insulation shall have adequate thickness,6 l8 S9 c1 Y j. u2 ^' ^- S3 _# r
or have a sufficient number of layers, to withstand the electrical stresses that can be expected
' M6 o. @. c" m) C$ y+ rduring the use of the appliance.
" ^1 n% b3 |, yCompliance is checked- ?5 H8 g$ [- ^0 A4 [& F2 y
– by measurement, in accordance with 29.3.1, or2 t$ Y; |) b5 N( x$ z: r3 H6 J
– by an electric strength test in accordance with 29.3.2, if the insulation consists of more
! e$ D" g# `: f [than one separate layer, other than natural mica or similar flaky material, or
+ [" B3 r9 v" Y) {0 j: r5 [+ K– by an assessment of the thermal quality of the material combined with an electric strength: q/ }; F) T2 b# P
test, in accordance with 29.3.3 and for accessible parts of reinforced insulation" B4 f0 l8 z; h; M# A0 j$ Q
consisting of a single layer, by measurement in accordance with 29.3.4, or
" h) p* P1 k$ {) d$ l9 E– as specified in Subclause 6.3 of IEC 60664-4 for insulation that is subjected to any
, H2 G2 q6 g5 }1 j1 g' s* k# R: @# [periodic voltage having a frequency that exceeds 30 kHz.! i- |; i3 l2 r$ a$ V6 b6 a0 p
29.3.1 The thickness of the insulation shall be at least/ s T; R, K: B: _
– 1 mm for supplementary insulation;% V& q% N! E+ _
– 2 mm for reinforced insulation.0 g0 R8 ?$ s4 }! n# [* ^+ f
29.3.2 Each layer of material shall withstand the electric strength test of 16.3 for) r/ T: X5 U! |
supplementary insulation. Supplementary insulation shall consist of at least 2 layers of
9 M+ \+ d: x' O, x% pmaterial and reinforced insulation of at least 3 layers.! N# [, Z: p# c8 x9 r4 b
29.3.3 The insulation is subjected to the dry heat test Bb of IEC 60068-2-2 for 48 h at a# Q3 S2 D2 a& F% A% J
temperature of 50 K in excess of the maximum temperature rise measured during the test of
4 W0 `$ \/ w' h# fClause 19. At the end of the period, the insulation is subjected to the electric strength test of
+ _% v# `- ?% `16.3 at the conditioning temperature and also after it has cooled down to room temperature.) \. F8 B+ [7 D2 Q% Q C$ f: q( [- _
If the temperature rise of the insulation measured during the tests of Clause 19 does not
/ w2 k: Y4 ]7 S: Wexceed the value specified in Table 3, the test of IEC 60068-2-2 is not carried out.
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