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| DSH 526
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: G- l) H0 e9 T- X5 ^5 v2 K9 Q2 M | Point on wave closing X7 m. C- n0 l% D# P: `
| 9.3.7.3
& D. I8 X6 p/ j7 V | 62019(ed.1)
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Standard: IEC 62019: 1999' n) w- s% }, n9 f6 g, x* F/ w
Sub clause: 9.3.7.3- S# T( X" j2 c# w
Sheet No. DSH- 526+ u5 ~0 A. ~. F9 x
Subject: Point on wave closing
. Z, I2 c4 e7 _Key words: - short circuit test - point on voltage wave2 D1 u, [) B/ c. ~5 i6 j$ g/ L0 n
Decision taken at 40th CTL meeting 20033 [* Q# p( y, R3 k5 _* e, e
Question:& s6 j" H3 ^! i' k, r
The issue concerns IEC 62019: 1999 (Auxiliary contact units) test procedure 9.3.7.3 in the test at0 I" e# r0 u9 a4 c/ t# D) X
conditional short-circuit current (9.3.7). SC 23E is concerned that there may be discrepancies in test
5 c- }: t2 {! e8 mresults made by different test stations, or at different times by the same test station due to the short" E$ V% U7 [& |0 V0 c5 p+ Y( J* N
circuit being initiated at different points on the voltage wave.# a5 [* z+ H4 n0 X& }+ o" K
Rationale:; T; ~4 e0 G8 U1 s
At the meeting held in Beijing, SC 23E has asked that the improvement that they have made to the
3 z; B5 N* h8 k6 ]8 K7 }standard be used by the CTL, as it will improve the repeatability of tests. According to IEC procedure
& U4 e' y T$ y4 c$ z% l7 n7 |, [for technical work, this modification can only be introduced in the maintenance of IEC 62019, which( K( O! m' m7 R/ ]
may imply some years before being endorsed in revised publication.1 ?; G# @) G; X, A
Decision:
, M) X/ n) @" q* {In performing the test of clause 9.3.7.3 of IEC standard 62019, the following revised test method6 N6 D& n- G$ Z
shall be used:- N' K# ]0 K2 ^
The procedure requires that the contact unit, in the closed position, be subject three times to short
3 q5 x" `1 g; j/ h/ @circuit, which is cleared by a short circuit protective device installed in series. Clause 9.3.7.31 j4 h: A& V' u0 }: Y( w
specifies three operations. For the first operation, the making switch is synchronized with respect to1 [& L+ M9 T% M' {/ O" d
the voltage wave so that the circuit is closed on the point 0° on the wave. This point is then shifted by" q/ h+ i9 Z' D1 r
30° for the second operation and to 60° for the third operation.6 l* w4 g0 y \" c; [
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