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' t4 P) @3 |7 r# m. g
4 o5 `+ n" J% \0 m( z% z1 L DSH 371
8 M* y7 a1 \- v) x/ \1 g" @$ ?7 m | Double insulation and reinforced insulation
, ?! n! [) ~7 S3 P1 j | 6.5.2
/ ?! V F$ o" z; s! ]0 s6 J* i9 @3 r | 61010-1(ed.1);am1;am2
3 R. k1 D5 A6 v) j' x. z |
* M% W6 _3 J3 F; g
, W- ~/ ~7 ^; p( v6 YStandard:
$ n3 a$ A2 _# b. RIEC 61010-1:1990 +A1:1992 + A2
" {9 y4 Z* J! o0 v w:1995
/ q7 o! W, G: q2 ]Sub clause:2 ^4 c# s( ]5 Z. \; @( P$ z
6.5.2* Z. m3 [! `& ^5 O5 [+ I$ a# l
Sheet n. 3710 P& x2 D4 r* _
Page 1(1)" o* U' O3 M( S1 `
Subject:7 L7 q# a) V/ l! b8 s% |( @# p1 `/ Q
Double insulation and reinforced( S& N7 ?- m4 N# R# \5 E
insulation* L. ?$ x! }4 X
Key words:
7 _- `, C( s% S- Vacuum encapsulated
9 J3 t8 l7 Q+ v8 f2 d# W1 @- Otransformer2 K: T/ z! q, j- t# _
Decision taken by+ T8 K' d+ m* ]0 R( b' z) d# V
ETF3 and confirmed( Q/ Q' M) ]2 F
by CTL at its 38th
6 |7 K ^, `% d8 ~' u3 H) w6 Umeeting, in Toronto: G' d' g% C# c8 m
Question:
8 D$ R/ p, N& [6 CCan we accept that the insulation between primary and secondary windings of a Vacuum5 I! \2 \; f' U$ z: r% C1 x+ g
Encapsulated Transformer comply with requirements of double insulation defined in
. Q- U$ o- Q$ Q; B9 H" J' wsub-claue 6.5.2.5 [( M" h* m) P: A4 k
Background+ |6 U: N4 V9 e: K" m
There is a conventional transformer with primary and secondary windings 220Vac / 12 Vac.8 Y' b- ?$ F h% k
Both windings are wound on the same part of the bobbin and separated by 8 layers of
1 F5 ^2 q" f/ _7 }: S4 O* Binsulation tape. The thickness of the tape is 0,05 mm which gives the distance through4 c( m. q1 d) Q6 k+ n
insulation between primary and secondary windings close to the end of the bobbin at least/ `5 G& i2 M8 G0 a# S% I( j
0,4 mm. . The insulation tape has fringes and is depicted in the attached drawing. The
" ?* O) Z: j# g4 Wtransformer is vacuum impregnated by AralditCW2245N.3 W1 e2 @4 s# M
The transformer has passed the test of . 2.9.6 and 2.9.7 of IEC60950 with humidity testing$ U6 g, y* s) ]
performed at 40C. This means that tests performed (temperature cycling test, Hipot test9 e3 j6 E) f% t1 N
with 3000x1,6Vac and sectioning after temperature cycling test) showed that there are no6 y+ L( b. g! r
voids nor cracks in the compund.! Z3 H4 d$ h" m3 B3 S1 d5 a$ \5 l; z
Decision:
: @! J g; b( x3 n* YThese measures taken are adequate to satisfy the needs of IEC61010-18 ?3 i+ r; r) I0 @- Q7 Q" n
) A! E" @) G8 {: u' \) f
& w3 G( k+ S5 z- _) o8 r/ h. R$ m; h: i" p$ \
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