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| DSH 752 y2 h$ l& e( ?6 p; a" t. {
# c2 b: |& b% M5 K3 {/ n3 \ | Definition of a flame for glow wire test
0 k$ f# @, _$ W4 l9 B | 11-12! Q- V/ V. Q9 b) t8 t, \* e/ S
| 60695-2-11 & 60695-2-12 & 60695-2-13
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Standard(s): No. Year# s! x; ?2 N7 c' B0 f, N& @
IEC 60695-2-11. D# b7 ~# v% y0 c, Z0 M. k; {
IEC 60695-2-12+ t5 \0 O' E% q; m8 B
IEC 60695-2-13' L3 S' u- K+ y+ C
DSH 07523 y2 o" F& B, s7 Q c( a1 k
20097 [6 b% v0 {) @& u
Category:, L) ]# ]6 @$ _7 F
VARIOUS - GENERAL
0 D3 e; _" j8 q* `6 LSub-clauses:
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Developed by:
* t8 G3 W( Q* c1 eWG4 – WG2- l- f2 Z; @1 Q+ J' n
Subject:
0 e8 ]% P9 U$ o1 _* Q; D0 q7 LDefinition of a flame for glow5 Z1 J) @4 ^+ b, `8 N: }) V
wire test
- X/ O) t$ h0 k! PKey words:
X) z' n* t. R6 W' \- Glow wire test$ i8 m# l) e; F1 G6 }
- Flame
0 ?' _9 z, u% D+ a/ c% t8 y. G- Corona Effect
) N2 G; O. a3 Q, e% Q- Ionized gasses- O% ~( Q4 `. O S+ h' ~
- Ignition of the sample' \' ?* e" N- |- I1 N0 l
Approved at the 47th CTL+ T6 B9 H7 E# u% u
Plenary Meeting, year 2010.
1 C* T7 L' ]2 T! FQuestion:& N3 o3 k6 a" ~1 U% B, g* t! G
How is the “Corona-Effect” to be interpreted when performing the Glow Wire Test?
8 O0 ^7 }! Z) j# r1 bDecision:
4 ]% q7 D" N- z7 UDuring the glow wire test (according to the temperature settings required by the standard), the
" t7 s9 b, H G3 ]. r5 zfollowing phenomena can occur:& Y4 d N$ Z7 Z; v) k* ?
1. If a brightly shining flame is observed directly at the test specimen (see picture 1), this is a
8 L$ u, F! A: Q5 H& O; Oclear indication of an ignition. Some materials show a colourless transparent flame3 n+ O. ?8 X( s8 h
instead of a bright shiny flame. This is considered to be ignition of the test specimen, if the
! c& |8 j+ D& n wmaximum flaming time allowed by the standard is exceeded.7 j X8 r) T4 c/ B
2. Sometimes, a circular corona can be observed around the tip of the glow wire, see picture
, ?' u }4 v/ m! ?0 n2. This corona consists of ionized gas, predominantly blue in colour and is located in the8 L2 a" g' z* M- w5 T# [
immediate vicinity of the glow wire. This phenomenon is not considered to be ignition of
* M6 z7 ?9 F, bthe test specimen, as long as it does not lead to an ignition of the test specimen according6 s" n& U, M+ ~6 L. e1 U4 P. T) h
to point 1.0 b: v! O# b5 f: G
3. Furthermore, ionized gasses can sometimes be noticed along the glow wire (see picture$ I# d6 h* m& U# P T+ Z3 m
3). This effect is also not considered to be ignition of the test specimen, as long as it does
( o0 b# S7 ]. s/ Knot lead to an ignition of the test specimen according to point 1.
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