DSH 526 Point on wave closing

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 526

Point on wave closing

9.3.7.3 ! _! Y, o2 f" U5 h- n$ {$ x

62019(ed.1)

) @6 v% j2 R0 I2 \* Y$ d  SStandard: IEC 62019: 1999
$ _9 m1 V$ n+ a7 USub clause: 9.3.7.3
  a9 {+ T7 x  b4 M7 w+ DSheet No. DSH- 526
) L3 b% q* O2 ^7 cSubject: Point on wave closing
5 w' N4 L& ^7 d5 t, X- z$ f$ ?8 RKey words: - short circuit test - point on voltage wave
Decision taken at 40th CTL meeting 2003
Question:
: S4 J4 _! {7 X5 d' J+ AThe issue concerns IEC 62019: 1999 (Auxiliary contact units) test procedure 9.3.7.3 in the test at
. |* z7 z  V' ~$ ?% v5 ], xconditional short-circuit current (9.3.7). SC 23E is concerned that there may be discrepancies in test
results made by different test stations, or at different times by the same test station due to the short
circuit being initiated at different points on the voltage wave.
. W* d# L9 h( z: o0 w/ V4 T! dRationale:
8 G( m  z- U7 i% W( N1 |At the meeting held in Beijing, SC 23E has asked that the improvement that they have made to the
standard be used by the CTL, as it will improve the repeatability of tests. According to IEC procedure
for technical work, this modification can only be introduced in the maintenance of IEC 62019, which
9 S, ~; f$ ~- p1 j; b; Pmay imply some years before being endorsed in revised publication.
* n! D/ A9 i4 l0 J/ Q! W& XDecision:
% K- Z% k/ v: M- [! A/ v3 O3 XIn performing the test of clause 9.3.7.3 of IEC standard 62019, the following revised test method
shall be used:
5 y! q5 Z" v( H1 P" G# \The procedure requires that the contact unit, in the closed position, be subject three times to short
circuit, which is cleared by a short circuit protective device installed in series. Clause 9.3.7.3
4 i1 [- H; ~+ t, i& Pspecifies three operations. For the first operation, the making switch is synchronized with respect to
" s; }1 q9 T, a# w4 b) y, lthe voltage wave so that the circuit is closed on the point 0° on the wave. This point is then shifted by
% u& \. q+ n" W- O- k0 x% }30° for the second operation and to 60° for the third operation.