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( k: ?4 j3 g1 M! C. n7 A0 c DSH 371
; R) E: A- r6 k4 w8 a* P* a | Double insulation and reinforced insulation
: |: q8 B3 S/ F( q | 6.5.2
4 X1 G, A) F* h1 N* }1 B | 61010-1(ed.1);am1;am2' }$ G: t! x' ~) i) r4 N9 ^
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6 @3 \6 v9 M. S
( P7 @$ ~1 z0 f" kStandard:7 Z3 C3 T; D2 I- w6 A1 c
IEC 61010-1:1990 +A1:1992 + A2% F& `- C2 O$ G4 q5 n% a
:1995
3 p( K- U) M/ H9 mSub clause:
& C; o; g( i& f/ C* Q. q3 M6.5.2
. J/ ~, v y; v8 j* [Sheet n. 371
0 Q" |! Q1 {1 h' YPage 1(1)
/ H' {5 F+ i# {Subject:
& Z: A. G0 u2 K3 H' O4 vDouble insulation and reinforced( S, s8 A! U: x; i" ~1 b- D" |
insulation$ K0 u! f. x, |4 o: p/ g
Key words:
! O S. @/ ^9 d5 }. A# J" ?( n- Vacuum encapsulated
1 \, `1 L4 F! z: {; V7 E0 ]transformer. C# c! H7 [/ c6 d7 q+ O1 K& }4 z
Decision taken by2 m* j3 o$ c B( ]) K9 W. F) W7 t
ETF3 and confirmed
1 ~9 ?) w, I fby CTL at its 38th" g+ l0 Z0 y5 A& n( M4 S
meeting, in Toronto8 C8 n- G. }: c' d* W2 X
Question:% ? T; x. E3 Q0 ? i. B
Can we accept that the insulation between primary and secondary windings of a Vacuum4 A* j, ]/ a$ [. s, n
Encapsulated Transformer comply with requirements of double insulation defined in
3 l/ m/ T- Y" e, C, rsub-claue 6.5.2.
; H# e$ {5 ]( ?* i; q, N* u& z& bBackground. P& B% Z6 m! Y6 i; ^
There is a conventional transformer with primary and secondary windings 220Vac / 12 Vac.5 A# G. P* V; [1 b* p# n9 e) i
Both windings are wound on the same part of the bobbin and separated by 8 layers of
! N" Y. X- c3 h8 ?2 i# P9 [insulation tape. The thickness of the tape is 0,05 mm which gives the distance through
" |( P" D/ h% j. Ginsulation between primary and secondary windings close to the end of the bobbin at least
6 j& f7 h4 y# @1 Z4 k0,4 mm. . The insulation tape has fringes and is depicted in the attached drawing. The0 ^. z8 v! ~- Q! H& k
transformer is vacuum impregnated by AralditCW2245N., ]. j1 w0 J/ y7 P: r+ P
The transformer has passed the test of . 2.9.6 and 2.9.7 of IEC60950 with humidity testing, m' j* m# x, h5 {! D* S. u) L
performed at 40C. This means that tests performed (temperature cycling test, Hipot test
- P' h) m2 R" p# e) V( G' Twith 3000x1,6Vac and sectioning after temperature cycling test) showed that there are no$ P0 F8 E- h$ c
voids nor cracks in the compund.
! F4 o2 t f2 E: L& a3 hDecision:
5 }# B# n. \% Z5 F+ M2 J6 cThese measures taken are adequate to satisfy the needs of IEC61010-1# }; [. [9 j. H3 W4 O: Q- p0 ]
7 c( I/ S0 U5 Z2 B
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