DSH 526 Point on wave closing

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DSH 526 6 V7 v5 X- c4 C

Point on wave closing ' \) _( b7 `* e- n

9.3.7.3

62019(ed.1)

Standard: IEC 62019: 1999
) B- z6 c5 \6 s  r  |Sub clause: 9.3.7.3
. v7 H* N2 w- c: j& w( SSheet No. DSH- 526
0 y5 S' d$ a  q6 C0 l5 `Subject: Point on wave closing
Key words: - short circuit test - point on voltage wave
) P8 {: ]2 w+ ZDecision taken at 40th CTL meeting 2003
6 o/ Q) w5 Y+ B' m% GQuestion:
" d( |) q, N, }) R+ c. a8 M( i( l# G: qThe issue concerns IEC 62019: 1999 (Auxiliary contact units) test procedure 9.3.7.3 in the test at
" h3 y* Z9 @; n. k7 b* uconditional short-circuit current (9.3.7). SC 23E is concerned that there may be discrepancies in test
: A' l* R' V; x8 r; q3 Xresults made by different test stations, or at different times by the same test station due to the short
$ M, Y" k( L' ?4 d9 Ccircuit being initiated at different points on the voltage wave.
Rationale:
+ Q3 p: w7 ]9 Z. kAt the meeting held in Beijing, SC 23E has asked that the improvement that they have made to the
/ m- ?/ X$ m; \; a. a3 U( }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
# j' l# t! [7 Smay imply some years before being endorsed in revised publication.
Decision:
In performing the test of clause 9.3.7.3 of IEC standard 62019, the following revised test method
shall be used:
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
( H/ O: f* S# y4 q5 dspecifies 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
" `1 w" t  g" ~. Z% X4 `30° for the second operation and to 60° for the third operation.
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