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: Y9 k: q( M; |: s3 M& t/ p* B! K
0 Q3 u( X. w# R3 Y& V) x: K3 X
| Double insulation and reinforced insulation2 N u* }: F5 j2 U+ c3 [
| 6.5.2
$ d# e) y' k9 n& `, E/ @" v | 61010-1(ed.1);am1;am2
. f0 a) b& {+ Q |
# ?+ R, e+ v N5 Y& O
: r. ^" \; ~0 b
Standard:
P t8 c3 e8 I2 O4 Q$ }IEC 61010-1:1990 +A1:1992 + A20 E7 \" D( S1 c
:1995% M0 a! m( z, C
Sub clause:0 l* b$ ^1 l! ] w2 g: Y
6.5.2
# r: h& E% b7 {3 ]! SSheet n. 371
/ }+ V U: Y$ V) K2 pPage 1(1)
2 w* x: h5 B3 y( e' Z# cSubject:9 [$ V* U) D& y$ K! ^* p$ }! j! G
Double insulation and reinforced! A( O T# j9 _3 F
insulation9 b0 ^# v+ q9 F
Key words:
6 M$ i4 I" R9 e9 a2 U2 H4 f- Vacuum encapsulated8 }" s- I& M# [& w1 K
transformer" G2 g m X0 y/ a% c
Decision taken by: V: n: G3 U6 o) j9 H4 ~; J7 V- Z
ETF3 and confirmed
/ _# a1 ?, @: R* H0 h: pby CTL at its 38th3 e8 A1 W2 u/ x6 ?9 X5 X0 `/ y
meeting, in Toronto/ f H) L- ]1 F
Question:
$ E7 D0 d8 @1 w1 E& i# R5 |9 I. BCan we accept that the insulation between primary and secondary windings of a Vacuum- N2 t: T8 H) Y, {2 |- O( Z+ c1 s' X
Encapsulated Transformer comply with requirements of double insulation defined in" o8 d+ C( w0 a! Q: C; C* L
sub-claue 6.5.2.
R6 H0 i" @& Z" f$ O9 |7 P7 Z$ eBackground, d1 Z Q; z6 z* }/ R
There is a conventional transformer with primary and secondary windings 220Vac / 12 Vac.( S: s: m2 x+ w$ n, O j; o
Both windings are wound on the same part of the bobbin and separated by 8 layers of, S9 N2 h) M2 X6 g7 b# u( w
insulation tape. The thickness of the tape is 0,05 mm which gives the distance through$ O/ q" W$ T$ A3 P# d$ h' T
insulation between primary and secondary windings close to the end of the bobbin at least+ L. T* L, ?5 R
0,4 mm. . The insulation tape has fringes and is depicted in the attached drawing. The& S! g+ R7 O3 o0 ~1 \. \" a
transformer is vacuum impregnated by AralditCW2245N.( C: V/ o, r; N8 j9 `8 Y
The transformer has passed the test of . 2.9.6 and 2.9.7 of IEC60950 with humidity testing
M$ H' D; x% a Zperformed at 40C. This means that tests performed (temperature cycling test, Hipot test
, y- S. Z4 ~9 }! W0 A5 ~6 h' kwith 3000x1,6Vac and sectioning after temperature cycling test) showed that there are no" {- }( y- `" |2 L( M6 K
voids nor cracks in the compund.
3 p% Z4 n& J" `, B U6 _Decision:
! P, o" c8 ?+ J! [These measures taken are adequate to satisfy the needs of IEC61010-1
) N* }6 {, _0 @0 \- l2 x" ~* F5 h, a* E, C
/ f$ J2 S! @ T, ?
' C% Y# a" @$ q' B, c! U |
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