DSH 371 Double insulation and reinforced insulation

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DSH 371 4 P- |1 r* N* t: E; p

Double insulation and reinforced insulation

6.5.2   M; a: W# D, _! |0 p+ n4 J$ x* I6 {

61010-1(ed.1);am1;am2 5 P$ }3 \! ]6 V! P8 h

# F8 L3 g8 k( d& S9 b5 ^( [9 T3 ZStandard:
/ N& R/ i8 q2 S2 j- Z: aIEC 61010-1:1990 +A1:1992 + A2
  [/ h' ~3 ~2 q* f% S3 I( t9 W:1995
4 J% @% P/ |2 SSub clause:
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  `& L6 E+ X, V6 L- bSheet n. 371
Page 1(1)
Subject:
9 K/ A+ B3 s- ~3 h/ UDouble insulation and reinforced
insulation
" b) x3 I5 A4 q! G" P" \2 K" @0 aKey words:
# ]1 p+ A$ p# s8 K- Vacuum encapsulated
transformer
Decision taken by
0 z+ t$ J8 ^+ B9 \' r6 C- xETF3 and confirmed
by CTL at its 38th
- l5 F- {1 S+ N0 S& `# C8 E0 omeeting, in Toronto
Question:
Can we accept that the insulation between primary and secondary windings of a Vacuum
Encapsulated Transformer comply with requirements of double insulation defined in
sub-claue 6.5.2.
Background
$ u1 B+ p' R9 O% `/ m# EThere is a conventional transformer with primary and secondary windings 220Vac / 12 Vac.
Both windings are wound on the same part of the bobbin and separated by 8 layers of
; R# O, B* k/ Z: p. Iinsulation tape. The thickness of the tape is 0,05 mm which gives the distance through
2 g8 Y$ B  x, r, m: a6 g; |insulation between primary and secondary windings close to the end of the bobbin at least
' I7 x9 }8 v( `% g3 \# B- o0,4 mm. . The insulation tape has fringes and is depicted in the attached drawing. The
3 f; w9 \* t7 u6 c9 Dtransformer is vacuum impregnated by AralditCW2245N.
9 \% u9 A6 C1 I- a" ]- A7 H1 JThe transformer has passed the test of . 2.9.6 and 2.9.7 of IEC60950 with humidity testing
performed at 40C. This means that tests performed (temperature cycling test, Hipot test
with 3000x1,6Vac and sectioning after temperature cycling test) showed that there are no
- |8 k9 A5 t0 p2 ]2 b" l: mvoids nor cracks in the compund.
6 e( |- I. \& q' T. ~6 O% JDecision:
These measures taken are adequate to satisfy the needs of IEC61010-1
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