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|  DSH 5266 n) n( l$ E; B- D
% m' O" z' z3 K+ E" Y1 J A- y
| Point on wave closing
" ]8 h: w& ~0 B1 o | 9.3.7.3* V( { [8 k8 I) @% p' }
| 62019(ed.1)( o1 m3 k" X. J1 b4 t& T# W
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1 Q3 B/ s$ i. [2 ?6 G; c
Standard: IEC 62019: 19994 T9 x) p- H7 R2 {* d4 H, B
Sub clause: 9.3.7.3
% x t2 [* t$ V9 ^1 ]/ ZSheet No. DSH- 526
! ^9 L: G0 E+ B$ P' T& A) eSubject: Point on wave closing
* V3 x9 Z G% ~0 m8 sKey words: - short circuit test - point on voltage wave- u/ v& Q0 R: E/ ~! P; m
Decision taken at 40th CTL meeting 2003" v9 o3 q! X! P* T) g
Question:- g9 |% T9 ^8 D
The issue concerns IEC 62019: 1999 (Auxiliary contact units) test procedure 9.3.7.3 in the test at
. w+ b7 w- c) {! ]8 V( \$ aconditional short-circuit current (9.3.7). SC 23E is concerned that there may be discrepancies in test ^: {) q9 m; U7 o- U, j) D" r
results made by different test stations, or at different times by the same test station due to the short
; q0 n, A* Y$ z4 c& icircuit being initiated at different points on the voltage wave.6 L! p, e2 u$ |+ Q
Rationale:3 {& B& P0 J3 \4 K- `/ V- d
At the meeting held in Beijing, SC 23E has asked that the improvement that they have made to the
: |6 v: m1 U( v; ]* K0 C) ]0 \* gstandard be used by the CTL, as it will improve the repeatability of tests. According to IEC procedure+ a$ j& F9 d$ o# u9 D+ L
for technical work, this modification can only be introduced in the maintenance of IEC 62019, which
G2 }" L$ p. hmay imply some years before being endorsed in revised publication.
% i W$ v& t4 m' zDecision:
$ x; _5 I/ F+ }. xIn performing the test of clause 9.3.7.3 of IEC standard 62019, the following revised test method5 Y5 {1 {2 A+ k7 L& h
shall be used:" ]3 f# o3 a" W2 M
The procedure requires that the contact unit, in the closed position, be subject three times to short
' R* y0 ]5 d% b5 y; f4 {circuit, which is cleared by a short circuit protective device installed in series. Clause 9.3.7.3
# ]+ w( i2 A& H! S1 Xspecifies three operations. For the first operation, the making switch is synchronized with respect to2 {( p* e. N( F' @
the voltage wave so that the circuit is closed on the point 0° on the wave. This point is then shifted by
$ F: k3 D0 w& y9 E. M0 k( c6 V( C30° for the second operation and to 60° for the third operation.7 t2 m. \: y; n8 [$ Y" h' N0 e
8 Y- w) b( t4 \: H6 r+ ]5 @4 C
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