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| DSH 392
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3 d4 S2 E" k" D2 d | Test of non-separable thin sheet material
+ `3 f7 A7 \0 H& }6 Q8 e) S | 2.10.5.2
8 l4 d* P0 H& s5 ? | 60950(ed.3)
/ n0 S7 A6 v5 K/ \ |
5 j: X3 ]! m/ OQuestion:
8 S& W5 C7 m1 |$ [+ E: OHow is non-separable thin sheet insulation in wound components tested?
( `% K' ^4 x A7 g: g0 c% B' IRationale:0 N; e8 C# q$ ]3 G
There are non-separable thin sheet foils on the market and used in wound components,
; c) ]8 ]6 S+ a; s8 Hwhich cannot be tested according to the requirements and test-method in the existing4 V3 U' S# ?: d5 E. }0 Q; O
standard. A proposal was made to TC74-WG6 how this matter can be handled. The
- x: x- f; K, z3 `proposal is attached.
2 y! r) F! [2 TDecision:
7 Y3 q G' e2 [Use of non-separable thin sheet insulation in wound components: ?/ e0 K8 b% G% u
The following proposal shall be used until the new edition is published.
" H1 `+ C, x8 @8 K$ g8 V1. Introduction. B; G7 N% ?1 z' l8 \8 {) M
This document presents two alternative versions of the test procedure given in IEC
) Q) Z% ~7 s! G% s* h, g8 p: r, Y61558-1 for checking the mechanical durability of thin sheet materials.
" p: T% W; Y& _, U9 w# MTest method X adapts the published procedure to the conventions and practices used in( ?" h; Z7 l) J8 Q- B+ R
IEC 60950. In Method X, the metal foil is secured to the sample prior to the test.
. F5 d! R; g( ~" K) {) m8 ATest method Y is the slightly different procedure observed on a video presentation,4 b- n/ _: O; h' \, l1 X( c
whereby the metal foil is only added to the test assembly after the sample has been
& b5 i) i9 i+ l7 v' H2 [3 Estressed by rotating it in the test fixture.
7 o. A# T. Y; R7 ^3 r6 |Test method Y appears to be the more practical method, and is evidently how the test is8 N. b& {( }6 a3 \; Y# Y" o
carried out in at least one test laboratory. The two methods should give the same results.
8 |2 ?7 W2 d/ _0 Y+ h3 P' i2. Proposal
; ]1 x; Q2 R5 U7 oChange the title of 2.10.5.2 to the following:
' {4 K2 W( A3 t- s( ^+ F2.10.5.2 Separable thin-sheet material, H& `4 `/ {6 P9 m
Modify the first paragraph of 2.10.5.2 as follows:$ O7 x3 O2 {; c; L9 v5 O! g" L
Insulation in separable thin sheet materials, and in two layers of non-separable thin sheet- {3 u: [, j4 x$ v
materials, is permitted, ….
1 {% c' y- c X" e lAdd a new sub-clause 2.10.5.X or 2.10.5.Y.
. V9 ~: D- m7 ^3 G% e# rTest Method X
' ~& O% q( t0 b2 R/ _% U2.10.5.X Non-separable thin sheet material
1 J/ D; ~0 y. P/ g* G) H( fInsulation in three or more layers of non-separable thin-sheet materials is permitted for use within8 a1 N7 o2 K2 F2 @
the equipment ENCLOSURE, and shall not be subject to handling or abrasion during servicing. It
8 t" I: }/ s$ i: [2 x% Mshall have adequate mechanical strength.
* |/ i$ o5 s0 G! |$ S4 E/ m7 cNOTE - The purpose of the tests in 2.10.5.X is to reveal defects that are hidden in inner layers of insulation,
1 A, R( O M3 X: R6 ~! qso there is no test for insulation in two layers. For insulation in two layers of non-separable thin-sheet
3 l* e/ N% e- Nmaterials, see 2.10.5.2( S1 _9 E& f3 F: d
There is no requirement regarding distances through insulation, nor for all layers of insulation to be$ s3 r6 X1 ^9 Q8 w* ^+ e
of the same material.5 x. a( {$ ^. H$ \
Compliance is checked by inspection and by the following test:
$ ], c3 R' u) A% Q8 GThree test samples of thin sheet material are used, each approximately 70 mm wide.; `! |. H7 `2 e9 l: R
One sample is fixed to the mandrel of the test fixture as shown in figure 5X.
{. K j2 E) U# T# V! J# r/ X& u0 kA sheet of aluminium or copper foil, 0,035 mm ± 0,005 mm thick, approximately 30 mm wide and at
' N6 g2 ]8 p3 H# R. ^3 kleast 100 mm long, is fixed to the surface of the sample. The foil is positioned so that its edges are0 m6 I( l5 K; H! w6 H
approximately 20 mm from the edges of the sample (see figure 5Xd) and so that when the
0 k2 F2 e, M8 L+ Lmandrel is in its final position, the foil overlaps the free end of the sample by at least 10 mm (see+ V+ R4 Q0 w. o
figure 5Xc). The foil is tightened by a pull of approximately 1 N, using an appropriate clamping9 b+ f. I, _ _( Q5 z
device.; ~! j6 V6 _! y7 V% a) _
A pull of 150 N is applied to the free end of the sample, using an appropriate clamping device. The# P3 Q1 ^3 k# Q! ]0 X/ @
mandrel is twice rotated forwards and backwards by 230°, and then forwards to the final position.
0 y/ e+ g( ^5 FWhile the mandrel is in its final position, and within the 60 s following the final positioning, an! x. w& O: Q* E$ b' |' J$ W3 ?! C4 G
electric strength test is applied between the mandrel and the metal foil in accordance with 5.2.2,' T! \' M) M7 U) ?. p
using a test voltage of 1,5 times the value specified in table 5B.5 m5 m6 [% p! t$ B# h0 }# c
The test is repeated with the other two samples! k- v* I7 S% x; r
If a sample breaks at the clamping device during rotation, the test is repeated on a fresh sample. If+ |5 k r6 l. B5 L# z- u
one or more samples breaks at any other place, the test has failed.4 \3 _. F, E5 y- G# @2 h( J' {9 @+ s
............................) b/ `1 M6 w: k/ y0 ^
Add new Figure 5X (adapted from Figure 6 of IEC 61558-1)# z5 c& l/ Q0 |8 w! N
Figure 5Xa is as figure 6a of IEC 61558-1, modified as follows:& L2 ]9 X0 J- T
Replace "3 x R = 0,5 ± 0,02" by "R = 0,5 ± 0,02 (typ)"
1 V ^. K j5 BReplace "Material: steel nickel plated or brass" by "Material: metal"/ s& ~( v; m& l9 H8 ~
Figure 5Xd is the same as figure 6c of IEC 61558-1
% Z# a8 U$ k/ ]5 ETest Method Y
2 l8 n8 E8 m8 q- r2.10.5.Y Non-separable thin sheet material
) G$ `! F3 w# W' G6 o1 DInsulation in three or more layers of non-separable thin-sheet materials is permitted for use within! p2 H9 ?. T$ E$ Y& Z
the equipment ENCLOSURE, and shall not be subject to handling or abrasion during servicing. It+ R$ U4 x4 K7 w: Y5 l( a9 q
shall have adequate mechanical strength.) a7 O' P. y3 l- b9 a
NOTE - The purpose of the tests in 2.10.5.y is to reveal defects that are hidden in inner layers of insulation,7 e [) k+ K# t' K2 C9 q
so there is no test for insulation in two layers. For insulation in two layers of non-separable thin-sheet# T+ m, f3 W1 W2 O8 {3 Z* w
materials, see 2.10.5.2' |% z, @( T- w8 S9 {0 o2 O5 J$ }
There is no requirement regarding distances through insulation, nor for all layers of insulation to be2 A( J6 ], a8 M( Q
of the same material.
, o6 V7 {8 X" W, Z6 NCompliance is checked by inspection and by the following test:% G- Q5 W8 A7 q( t
Three test samples of thin sheet material are used, each approximately 70 mm wide.
0 W' y8 e8 e0 j# b2 f6 @& Q5 QOne sample is fixed to the mandrel of the test fixture as shown in figure 5Y.
+ e, I, f0 k/ hA pull of 150 N is applied to the free end of the sample, using an appropriate clamping device. The* j; F6 w, E% v- I
mandrel is twice rotated forwards and backwards by 230°, and then forwards to the final position.3 N9 U) ?$ h5 V; ]7 T8 C
A sheet of aluminium or copper foil, 0,035 mm ± 0,005 mm thick, approximately 30 mm wide and at
; ]- w4 \3 x# U. e. v Xleast 200 mm long, is placed across is the surface of the sample, hanging down on each side of
2 Z) A/ x9 V/ h9 @the mandrel. The foil is tightened by a pull of approximately 1 N at each end, using appropriate- P' I5 G0 P. i& l* l8 s, d
clamping devices.. The foil is positioned so that its edges are approximately 20 mm from the edges
! W; q1 Y9 n) P2 t# H8 K. j$ N! Lof the sample (see figure 5Yd).
* y4 s7 G/ o/ {3 O' V$ _While the mandrel is in its final position, and within the 60 s following the final positioning, an8 X1 A! ~0 q8 G- \+ q) D
electric strength test is applied between the mandrel and the metal foil in accordance with 5.2.2,
/ a& m8 S+ ]0 ]using a test voltage of 1,5 times the value specified in table 5B.
% y' z4 @$ D( P/ R* c1 P4 iThe test is repeated with the other two samples# p! _- t6 f; O7 `( Z/ z% w, ~
If a sample breaks at the clamping device during rotation, the test is repeated on a fresh sample. If" D6 L# c/ V2 P3 @( ?
one or more samples breaks at any other place, the test has failed.
* @, w u' z) _0 f( U! r...............................
2 B5 `# J# q: l; F2 W, q+ TAdd new Figure 5Y (adapted from Figure 6 of IEC 61558-1)& T. Q, i. C7 B3 o
Figure 5Ya is as figure 6a of IEC 61558-1, modified as follows:
3 M5 x" ^' j2 [% c9 ~: |0 N* {3 {+ yReplace "3xR = 0,5 ± 0,02" by "R = 0,5 ± 0,02 (typ)"/ \* @6 r) s! K5 u! B' N
Replace "Material : steel nickel plated or brass" by "Material: metal"
, _" h! q7 @0 Q Y4 u, m. fFigure 5Yd is the same as figure 6c of IEC 61558-1
6 Y7 h0 b5 V; p5 }3 Y3 P0 p* h! S F. x
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