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6 w) d0 ?1 J. c0 d* B: A/ C2 a; U; Q. j+ ?& u& \! {1 }! o; V2 ]
| Double insulation and reinforced insulation
$ @ v: l; w5 W | 6.5.2
: P0 H8 ^# f4 F/ e | 61010-1(ed.1);am1;am2/ U5 }) W) ^, D5 n+ \- s' ` P5 U
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Standard:
" D* M' A( {3 P6 b, iIEC 61010-1:1990 +A1:1992 + A2
7 U( X! H7 \0 N4 [- m:1995' h2 F2 T. q- @5 |
Sub clause:
; _9 X/ u8 i9 q$ Z6.5.20 E3 ]0 M1 p& ^, ]. Z* w# M
Sheet n. 371
k# b. J. G: rPage 1(1)
6 S: s" K4 H+ K$ u3 m4 D, t- ZSubject:
1 J- h) B7 _/ ^5 S, t. |# p7 ~Double insulation and reinforced ~+ v( x9 t% G
insulation2 a* B+ j, Z4 X- R4 B5 {! r
Key words:7 ~: E' N- p" X# U
- Vacuum encapsulated
: ?1 X7 \! J1 \" b' Wtransformer. f C! J( k- j4 C- `- w6 V
Decision taken by
: L$ k! d$ H5 f. _5 a8 bETF3 and confirmed7 n& t9 p, w' k0 y8 S% ]9 j
by CTL at its 38th! ] s' v+ K2 i/ }; m8 N
meeting, in Toronto# c- v6 \2 z5 p$ _
Question:
5 m- S+ e$ X3 D& v3 dCan we accept that the insulation between primary and secondary windings of a Vacuum; P& x: d" K& x) Z9 \) M6 Q
Encapsulated Transformer comply with requirements of double insulation defined in
: ?9 P V( G( k, z! d4 \sub-claue 6.5.2.
; B9 m' L* a1 }1 T7 ?" B5 e3 L. jBackground6 p* C$ M& t, b! _4 H/ a' k( L4 O
There is a conventional transformer with primary and secondary windings 220Vac / 12 Vac.
2 X0 I9 g! _/ w) g- ZBoth windings are wound on the same part of the bobbin and separated by 8 layers of- Z, B0 s* K4 q$ p3 N$ S
insulation tape. The thickness of the tape is 0,05 mm which gives the distance through- s f4 L& y' P8 f& \& A
insulation between primary and secondary windings close to the end of the bobbin at least( U& Z: k0 T! v
0,4 mm. . The insulation tape has fringes and is depicted in the attached drawing. The" D; W% H: k# y; @
transformer is vacuum impregnated by AralditCW2245N.
8 M6 I3 d4 P1 c4 M& xThe transformer has passed the test of . 2.9.6 and 2.9.7 of IEC60950 with humidity testing
( H( F0 Z; |0 ~/ L: Pperformed at 40C. This means that tests performed (temperature cycling test, Hipot test
% H) M# x' n0 @' ?with 3000x1,6Vac and sectioning after temperature cycling test) showed that there are no9 F: D' b, e: S8 T4 f
voids nor cracks in the compund.+ @4 Z, H' u( T
Decision:$ c j, O0 c; \" Z/ W
These measures taken are adequate to satisfy the needs of IEC61010-1
7 E* r$ J$ Z# O3 m- ?1 A, N
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