安规网

标题: DSH 752 Definition of a flame for glow wire test [打印本页]
作者: 小米    时间: 2012-11-8 19:48
标题: DSH 752 Definition of a flame for glow wire test
DSH 752
3 p5 X& T2 n! ?" l: J5 _! Z) j; Q, s  i# [7 ?6 y3 `% ~
Definition of a flame for glow wire test2 C) A1 l+ _  ?4 L( Y3 K
11-12" J# u( ~. P! n! Z- K5 }
60695-2-11 & 60695-2-12 & 60695-2-13
- j0 B/ B2 ^) ]. K

9 Y% I" n% n6 \* y- K3 e3 Y& @Standard(s): No. Year' H- X' ]- L1 u' z
IEC 60695-2-11% p2 h  D& L8 N
IEC 60695-2-12
4 w4 m* M' a) B5 ^' p2 ^' C( jIEC 60695-2-137 P) [9 b, K) ^: _1 ?- q/ l
DSH 0752
* M# b8 x. H6 |4 m2009+ a; v  c. D, T; a
Category:
7 p( g8 f0 E) j  _; AVARIOUS - GENERAL- v) ?" P  M  U0 B* v
Sub-clauses:
8 R9 g2 ~  ?1 I- K, ^) `11 - 12
- f7 E9 p5 \5 J' r* ]4 I, _, B: pDeveloped by:& P! V" X$ W, \, |% j3 P
WG4 – WG2
8 g( x7 e/ g& z- VSubject:
( _+ l  X. a4 V$ C; K  EDefinition of a flame for glow/ b/ J. w: j8 k# I) Y
wire test/ V  O5 `# k5 Y& V) _9 H' N5 V" w
Key words:+ u& [! k9 O: X! f1 I$ P0 f
- Glow wire test
7 \( m6 `; s  K" y0 l- Flame- t% G7 G' ]( u6 Q+ k: O
- Corona Effect
( q3 ^0 K3 h5 }; `, z; M2 i( b- Ionized gasses
) y, A# E" D% ^& w% X- Ignition of the sample' M, a: g0 \" B, o5 C
Approved at the 47th CTL0 h7 r, z( `. {: Z6 E; N6 u' c; T! |
Plenary Meeting, year 2010.0 q8 N( l2 O; ]1 @$ |3 m/ `
Question:
+ Q% J/ G0 d. y4 EHow is the “Corona-Effect” to be interpreted when performing the Glow Wire Test?3 Q; L8 a; S; T! d3 r7 s! V
Decision:0 k( q/ J8 p0 K
During the glow wire test (according to the temperature settings required by the standard), the& K9 ~/ A+ e/ ]/ I/ p% M
following phenomena can occur:$ a7 Z  g8 m" H" J1 E8 E$ v
1. If a brightly shining flame is observed directly at the test specimen (see picture 1), this is a5 J+ S4 \) w7 y+ i$ }% F( i
clear indication of an ignition. Some materials show a colourless transparent flame3 U) r, N: Y7 Q
instead of a bright shiny flame. This is considered to be ignition of the test specimen, if the
1 C3 F" D/ m9 B0 i% {+ x0 @+ ?1 {maximum flaming time allowed by the standard is exceeded.* F. B8 u9 o6 k3 i- s; h) ?- n3 G8 `
2. Sometimes, a circular corona can be observed around the tip of the glow wire, see picture( V8 {8 G" n) S. V- _2 J9 K7 G
2. This corona consists of ionized gas, predominantly blue in colour and is located in the
; g; {. H; a/ m1 c0 ~immediate vicinity of the glow wire. This phenomenon is not considered to be ignition of" T4 F5 l4 g; f7 p. `$ @! K
the test specimen, as long as it does not lead to an ignition of the test specimen according
% n  V7 A( F. |0 R  Z$ kto point 1.
* c* D# ]; w: j9 F4 C$ N5 E/ I3 y3. Furthermore, ionized gasses can sometimes be noticed along the glow wire (see picture! z  }4 m% v7 O; \+ t7 f/ F9 R
3). This effect is also not considered to be ignition of the test specimen, as long as it does0 `# p3 ]4 A) P! K5 o
not lead to an ignition of the test specimen according to point 1.
- u* m7 Y* e+ S5 y
: h4 q" A) h8 h# R* o$ q[attach]77309[/attach]: b9 z; O) U& n




欢迎光临 安规网 (http://bbs.angui.org/) Powered by Discuz! X3.2