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) T2 {; G- ^$ N- F6 J4 s/ E
; G/ ~1 s/ i! w7 s: `+ m. n
| Double insulation and reinforced insulation3 S; {! @0 l) x! P- q: g
| 6.5.2
8 B" e' E- `- g" V" l. n | 61010-1(ed.1);am1;am28 l8 S5 W ^; U
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) L# L, f2 d: s' X, a9 O- a* k
- }( i: |2 z0 S& o% n3 {Standard:
. \6 }: y) w/ _, O6 N9 Y1 O3 TIEC 61010-1:1990 +A1:1992 + A2- p6 r" s/ O ]$ b0 V
:1995. n. e9 ]! p) j0 {) h) Y* b9 z
Sub clause:! I% G/ W" o! \% w2 G
6.5.2" M# d' g, Y, \& N
Sheet n. 371% c6 \# r9 L7 {; y$ Z
Page 1(1)8 R1 Z* G* _2 |$ T0 c- p
Subject:
/ o0 Z$ L; U+ M9 W1 ?8 I7 GDouble insulation and reinforced
0 Q; z7 C$ M$ J+ E: W' p! _ d1 Hinsulation
% J1 b4 X( R. v* t: |+ I7 uKey words:
0 y3 ?. O3 X, K* g( z- }* T3 _; A- Vacuum encapsulated
# s+ W5 J( V+ Ltransformer
6 [: Q i, p$ S3 D3 Q0 bDecision taken by
1 K6 Y* z4 J1 `8 p* U" X0 y$ U5 `ETF3 and confirmed8 U- T4 e }9 L+ d+ R# U. S
by CTL at its 38th! M5 R# W% p2 s- }
meeting, in Toronto
; V( ^7 |: w" W/ o. w1 j% R. IQuestion:$ S0 G1 c" B$ f5 [3 ]3 _3 L8 \% K
Can we accept that the insulation between primary and secondary windings of a Vacuum
* V. y' s# X/ `2 y" A6 F, gEncapsulated Transformer comply with requirements of double insulation defined in; Y+ i- [) `7 r/ U/ \
sub-claue 6.5.2.# F4 F0 O w1 A* o! q0 ^
Background8 K: \) J" p* ]( f; f
There is a conventional transformer with primary and secondary windings 220Vac / 12 Vac.
6 v+ ?& f' v/ r- s, N3 u3 E E! UBoth windings are wound on the same part of the bobbin and separated by 8 layers of6 R1 Y# ~+ [2 [
insulation tape. The thickness of the tape is 0,05 mm which gives the distance through
; Y' B! g0 O# h/ x' g. Linsulation between primary and secondary windings close to the end of the bobbin at least+ i- m- l9 w% N# l+ _
0,4 mm. . The insulation tape has fringes and is depicted in the attached drawing. The
6 H6 Q2 N- P6 a2 R' ]3 Otransformer is vacuum impregnated by AralditCW2245N.3 j w$ O& G8 g, P+ \- C
The transformer has passed the test of . 2.9.6 and 2.9.7 of IEC60950 with humidity testing/ {2 E0 h' t" S2 G% O
performed at 40C. This means that tests performed (temperature cycling test, Hipot test
; m0 d( Y: R$ fwith 3000x1,6Vac and sectioning after temperature cycling test) showed that there are no
* r9 M2 X2 {6 O- uvoids nor cracks in the compund.# W7 | i u) q- G! q- {9 N' z0 u" Z, k7 U
Decision:
2 N" V. j; c$ |1 GThese measures taken are adequate to satisfy the needs of IEC61010-1
. b$ F; C/ T9 W/ f& R _! M6 [ p) X( }! ?4 K2 h
9 L8 B6 E5 H! ]$ \# K2 ?
/ C% C4 m! [8 r! k j4 Z J! \$ m
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