|
|
|  DSH 5260 E* D# k4 L1 ]' j+ l
7 V' c% n: S) h3 ]8 k& N* R# u; K/ l4 V
| Point on wave closing
( H& Y( a4 d8 U1 c& o. N | 9.3.7.35 z$ y7 j5 c5 t
| 62019(ed.1)/ p+ A8 o" o' v, m* }5 I) e: Y7 T A
|
9 ?; |. d/ i# J" ^+ f3 ]: {Standard: IEC 62019: 1999
% w* W/ F# f$ e# Z7 t" m7 ]Sub clause: 9.3.7.3
' A0 |, K. ?( K+ cSheet No. DSH- 5269 ]- ^& @% `6 m) c$ [' f# e
Subject: Point on wave closing) \5 J- d* P5 ]6 [- g
Key words: - short circuit test - point on voltage wave
9 T5 M! I. ]; \" r& x4 E0 YDecision taken at 40th CTL meeting 2003* V% k }3 p% U j8 B; V
Question:2 H. p5 z2 V5 }# I
The issue concerns IEC 62019: 1999 (Auxiliary contact units) test procedure 9.3.7.3 in the test at8 w2 s/ }( X) |
conditional short-circuit current (9.3.7). SC 23E is concerned that there may be discrepancies in test# B8 g3 c( D4 }! n9 j9 \3 _9 K
results made by different test stations, or at different times by the same test station due to the short9 o8 J) \3 M, a& M2 F
circuit being initiated at different points on the voltage wave.
! T! d4 Y- h e2 I* GRationale:
7 I/ ^! o4 w* Y: S/ d0 ~2 L9 IAt the meeting held in Beijing, SC 23E has asked that the improvement that they have made to the
' J4 l& K+ v) G! d" w# [standard be used by the CTL, as it will improve the repeatability of tests. According to IEC procedure
- L& \5 h( u2 E! | wfor technical work, this modification can only be introduced in the maintenance of IEC 62019, which
[( `" _9 H$ k+ r8 ^/ gmay imply some years before being endorsed in revised publication.
+ q8 m { Z, m9 r. s8 ~Decision:
6 z; D. H3 V4 z6 h SIn performing the test of clause 9.3.7.3 of IEC standard 62019, the following revised test method
; d7 c8 {3 b- ?4 zshall be used:
3 T+ t$ i* O) ^/ x4 CThe procedure requires that the contact unit, in the closed position, be subject three times to short9 D& G# }4 p2 {. a, j- \
circuit, which is cleared by a short circuit protective device installed in series. Clause 9.3.7.3* S* m) [ X4 M) r: T( V
specifies three operations. For the first operation, the making switch is synchronized with respect to" ]$ e4 G2 P" g
the voltage wave so that the circuit is closed on the point 0° on the wave. This point is then shifted by* N4 N4 t6 p$ u# d3 ^3 W
30° for the second operation and to 60° for the third operation.1 g9 `; Y' p }. L7 [% Y& U! G
: }, Y! ~3 l# F: x
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有帐号？注册安规
x
|
/2 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2012-11-7 18:32
收藏
分享
好帖
鸡蛋
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡