DSH 752 Definition of a flame for glow wire test

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DSH 752 ; A  s  q! m7 }6 T; X  W. x * W: r6 ^) h% O/ k% g9 M+ j* R* f

Definition of a flame for glow wire test

11-12

60695-2-11 & 60695-2-12 & 60695-2-13 ' `: G4 ~0 X+ ]1 x# A) e0 y

Standard(s): No. Year
IEC 60695-2-11
$ {) t6 b% y2 ?& g1 |% `IEC 60695-2-12
IEC 60695-2-13
1 `4 i0 j4 M( }6 l2 \% e$ J8 iDSH 0752
2009
Category:
VARIOUS - GENERAL
' C  w/ f1 U' ]0 X- Z  aSub-clauses:
5 \1 L! E# K* n( D11 - 12
Developed by:
& R4 b" e& u6 \WG4 – WG2
3 j2 M: [+ ~9 T3 K- M5 |6 HSubject:
- G8 {" b6 `" N- ^3 H9 |9 fDefinition of a flame for glow
wire test
' L! R; e7 K) x$ I; zKey words:
0 E* ~! P& f; B! H! \- Glow wire test
- Flame
- Corona Effect
8 R5 j1 r. g' f4 _  g- e8 P1 H1 z" F- Ionized gasses
4 Z0 p0 _0 r, o9 ?- Ignition of the sample
( t5 g5 p# F' Y) O5 S! @$ EApproved at the 47th CTL
( T' U$ V  ~. {( u: I/ H0 WPlenary Meeting, year 2010.
' |% m' X' w: v! D/ {. P3 `- l" BQuestion:
How is the “Corona-Effect” to be interpreted when performing the Glow Wire Test?
Decision:
During the glow wire test (according to the temperature settings required by the standard), the
( n  ?0 z6 k/ q$ [" O# W3 }6 J9 Jfollowing phenomena can occur:
1. If a brightly shining flame is observed directly at the test specimen (see picture 1), this is a
clear indication of an ignition. Some materials show a colourless transparent flame
# o. g6 R8 F* E6 G$ Zinstead of a bright shiny flame. This is considered to be ignition of the test specimen, if the
* I7 |/ D' h4 e9 n* U7 H0 Dmaximum flaming time allowed by the standard is exceeded.
' h6 C5 Z7 F; G: W7 X! w+ a2. Sometimes, a circular corona can be observed around the tip of the glow wire, see picture
9 E& @& p- x: {. R) I, }2. This corona consists of ionized gas, predominantly blue in colour and is located in the
5 @1 W' t3 e3 P; ~5 Aimmediate vicinity of the glow wire. This phenomenon is not considered to be ignition of
& H4 k) o$ O$ v( @( Nthe test specimen, as long as it does not lead to an ignition of the test specimen according
to point 1.
7 x/ M8 }! o+ V1 w7 q9 {3. Furthermore, ionized gasses can sometimes be noticed along the glow wire (see picture
, q: ]) c: J4 T8 ?# l$ \5 q3). This effect is also not considered to be ignition of the test specimen, as long as it does
1 W: ?7 m, Q& v  r, T) Nnot lead to an ignition of the test specimen according to point 1.