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标题: 电工绝缘胶布作附加绝缘 [打印本页]
作者: yearl    时间: 2013-5-5 08:12
标题: 电工绝缘胶布作附加绝缘
II类器具，通过外壳的开口，试验指触及到了带电部件的基本绝缘。# S+ L- M0 U3 e  [/ a+ j
现在想用两层电工绝缘胶布缠绕在基本绝缘上作为附加绝缘。' \2 ]. X% K8 S8 m( i7 N3 x
请问这样可以吗？
  r& I! u% s5 d& H如果不可以，违反了标准的哪些条款？
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作者: hgf397556998    时间: 2013-5-5 08:25
个人认为，需要符合绝缘耐热，绝缘就是附加绝缘的耐压试验，耐热应当没问题，如果有认证自然更好，但是29章貌似对附加绝缘有厚度要求，你的绝缘胶布行吗？
作者: yearl    时间: 2013-5-5 11:16
本帖最后由 yearl 于 2013-5-6 08:12 编辑
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6 e$ N; t' @$ }2 P" k两层薄层材料，每层都符合附加绝缘要求；) X+ g" b& R; a& d1 H2 t6 _& W  Z( K/ E
虽然厚度小于1mm，但是隔着外壳，有必要进行21.2的刮擦试验吗？
; Q3 P2 z! a( D* U) J) }隔着外壳，不应判为可拆卸部件；
5 r# z* H7 Y0 I  _/ p第19章试验时温升值不超过表3，不必进行干热试验。
. h$ |" l: @: p: A: |! c" ?所以我找不出不可以使用的依据。
作者: Dan_Tan    时间: 2013-5-6 09:00
以面两种情况OK
- F2 c  C9 P- b: W6 n1， 加一层厚于1mm的套管2 F9 Q' O' C% B8 [" e/ t9 k7 Y
2，加两层可套管（每层需分别可通过电气强度测试）
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7 v" W( ^$ O- Z2 E' X/ N# l标准要求如下：5 ]7 w& ]- I. v0 O  O( T
29.3 Supplementary insulation and reinforced insulation shall have adequate thickness,: t5 ?  y! r# P! |% j
or have a sufficient number of layers, to withstand the electrical stresses that can be expected- n( Z3 _; ~) |. q* E
during the use of the appliance.
9 R1 @5 g  v! c) u8 bCompliance is checked1 W' r3 k1 z  J: v
– by measurement, in accordance with 29.3.1, or& m. b$ @" X2 L) J. m( q
– by an electric strength test in accordance with 29.3.2, if the insulation consists of more& H9 e7 L; f, U# I5 ?; _4 D4 M! j1 j
than one separate layer, other than natural mica or similar flaky material, or
+ _3 a, s: p) n( J– by an assessment of the thermal quality of the material combined with an electric strength
0 L; J7 ~8 y5 Q2 L* G: ]3 ttest, in accordance with 29.3.3 and for accessible parts of reinforced insulation
# h! o" s1 l( S$ d4 \5 {- gconsisting of a single layer, by measurement in accordance with 29.3.4, or4 j3 y7 N+ i3 S
– as specified in Subclause 6.3 of IEC 60664-4 for insulation that is subjected to any4 M; b  s# k! C- B5 \' a, f
periodic voltage having a frequency that exceeds 30 kHz.- j2 `5 E: l- P$ D7 b2 g  T4 x
29.3.1 The thickness of the insulation shall be at least' ]6 \6 @% y3 a* C* K( y. r! X6 B
– 1 mm for supplementary insulation;* L4 X8 v* g) a! w! c
– 2 mm for reinforced insulation.
( C" l/ a( |# N  ?29.3.2 Each layer of material shall withstand the electric strength test of 16.3 for% k0 ~5 `- k% N
supplementary insulation. Supplementary insulation shall consist of at least 2 layers of! m2 g+ w& @' {9 @
material and reinforced insulation of at least 3 layers./ s1 p6 |8 Y5 ~( c0 @8 q0 ^% X
29.3.3 The insulation is subjected to the dry heat test Bb of IEC 60068-2-2 for 48 h at a
# E% e; j) |+ e& l% E- ~3 F/ y1 S& ctemperature of 50 K in excess of the maximum temperature rise measured during the test of
$ Y1 I* ^, `' ]1 n2 {, i" q+ \+ sClause 19. At the end of the period, the insulation is subjected to the electric strength test of
$ f# K3 d$ C# R4 J! e7 P" p3 J16.3 at the conditioning temperature and also after it has cooled down to room temperature.
0 B0 C* G+ S# `# A+ U& cIf the temperature rise of the insulation measured during the tests of Clause 19 does not! E; F: K# Q! \) @2 p! H, k- @. S9 _
exceed the value specified in Table 3, the test of IEC 60068-2-2 is not carried out.
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作者: winson1982    时间: 2013-5-28 15:11
要是符合绝缘要求的话个人觉得应该可以的，但一定要可靠固定，比如加根扎带
作者: 一行白鹭上青天    时间: 2021-4-26 17:59
yearl 发表于 2013-5-5 11:168 p" l! n, a. q3 P
两层薄层材料，每层都符合附加绝缘要求；$ \2 s' c$ D  E; J1 U& `' s) u
虽然厚度小于1mm，但是隔着外壳，有必要进行21.2的刮擦试验吗？0 L8 A, k) z9 G0 V- k# c
...

  ]1 a. o: e5 ]( M/ D我最近也在找这个问题，找不到理由不能用，但又觉得不合适。请问前辈您当时是怎么解决的？
作者: innochina    时间: 2021-5-6 10:31
量产产品中，不应该使用电工胶布这种东西进行绝缘，
( u& G5 t% Y; K+ W1.因为用胶是不可靠的固定方式，
' v* P7 [1 c7 k' [3 q0 L/ t2.你无法控制胶带缠绕的总厚度，) k9 x" K8 ~( F8 q0 o7 h
3.改小开口挡住试验指，或者安装挡柱试验指的零件不碰到带电部分，



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