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[POW] DSH 526 Point on wave closing

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发表于 2012-11-7 18:32 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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DSH 526: ^: s( O4 b) {7 Z1 n, h

, T" V- U3 N" I- n( }( p  e
Point on wave closing8 y  y$ L3 g. l4 l
9.3.7.3
2 _+ L# z) d0 K; e
62019(ed.1)* F! L  A- N7 g

( u; x# Y" ]+ H/ n* u, p/ ]Standard: IEC 62019: 1999
7 S, F( o6 o2 x* V% n% LSub clause: 9.3.7.3
" B; {* |) F  E  M( DSheet No. DSH- 5266 g# j" G$ o3 f7 f, y! C
Subject: Point on wave closing
0 t  L9 p- `; [: A/ u- eKey words: - short circuit test - point on voltage wave  M! T1 m( Z- r. Y% F
Decision taken at 40th CTL meeting 2003
& b/ A. z# r% L& z% Z4 x0 CQuestion:$ D4 a4 }; R3 x. w8 Z
The issue concerns IEC 62019: 1999 (Auxiliary contact units) test procedure 9.3.7.3 in the test at, G4 F" ]$ i2 I% h+ J9 c- S
conditional short-circuit current (9.3.7). SC 23E is concerned that there may be discrepancies in test1 @( c+ h  T( V* I. G, I8 A
results made by different test stations, or at different times by the same test station due to the short
5 T1 K" N6 }3 ]7 I3 _circuit being initiated at different points on the voltage wave.
% g, p: y$ i& N0 K6 \: d2 \Rationale:" i! i1 U. z* J) x4 A0 b% u5 z
At the meeting held in Beijing, SC 23E has asked that the improvement that they have made to the% Q$ J0 x* b% @, h2 C
standard be used by the CTL, as it will improve the repeatability of tests. According to IEC procedure# ^/ `6 q9 f7 q+ T* i6 @1 C0 x
for technical work, this modification can only be introduced in the maintenance of IEC 62019, which3 l$ \) A: p$ W1 z' p3 F; y
may imply some years before being endorsed in revised publication.
3 c" L! h( N( O4 P% wDecision:
- G# f. s  f: A: S* v! eIn performing the test of clause 9.3.7.3 of IEC standard 62019, the following revised test method
9 Y# V6 V- q: i, ^/ W' xshall be used:9 O/ F/ O: k, O
The procedure requires that the contact unit, in the closed position, be subject three times to short
2 Y, C+ s; W$ E5 R  I  w! ccircuit, which is cleared by a short circuit protective device installed in series. Clause 9.3.7.3/ t+ _- V$ ]/ ^2 P1 G- C  D
specifies three operations. For the first operation, the making switch is synchronized with respect to7 q* x7 Z) t, W" r1 }
the voltage wave so that the circuit is closed on the point 0° on the wave. This point is then shifted by
9 J' z4 `* r" \3 b& H/ @' [30° for the second operation and to 60° for the third operation.: [  z0 H; p8 d/ g8 k  A: E
& b; a. z$ d0 }* ^& A; M

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