DSH 526 Point on wave closing

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DSH 526   c# F7 T  C) r' d* O' ^; D& x1 D

Point on wave closing

9.3.7.3

62019(ed.1) 0 S0 {! Z% ]! g! W

Standard: IEC 62019: 1999
Sub clause: 9.3.7.3
* ]4 t8 i0 h) @* _- S, Z/ W* iSheet No. DSH- 526
Subject: Point on wave closing
4 n2 C5 V# a* q6 d' ~! MKey words: - short circuit test - point on voltage wave
Decision taken at 40th CTL meeting 2003
  T+ n- @& @# u' ZQuestion:
2 d( `% B% n6 t. y  u* OThe issue concerns IEC 62019: 1999 (Auxiliary contact units) test procedure 9.3.7.3 in the test at
conditional short-circuit current (9.3.7). SC 23E is concerned that there may be discrepancies in test
  e3 y  o+ m  m3 g0 ?  v7 x4 fresults made by different test stations, or at different times by the same test station due to the short
1 m* c% _! i1 w% [& k7 u4 rcircuit being initiated at different points on the voltage wave.
  q3 g; |$ t& N& ^; zRationale:
- \4 p5 i, K- dAt 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
may imply some years before being endorsed in revised publication.
7 q5 f6 A6 {- q! s5 c! kDecision:
In performing the test of clause 9.3.7.3 of IEC standard 62019, the following revised test method
7 c" G8 U2 k* ?  g% bshall be used:
The procedure requires that the contact unit, in the closed position, be subject three times to short
5 B* Y4 V7 M0 Y; N% i4 rcircuit, which is cleared by a short circuit protective device installed in series. Clause 9.3.7.3
2 W; {% ^2 j$ `0 y% jspecifies three operations. For the first operation, the making switch is synchronized with respect to
the voltage wave so that the circuit is closed on the point 0° on the wave. This point is then shifted by
30° for the second operation and to 60° for the third operation.