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Standard: IEC 62019: 1999: ^1 u6 A# ?; k1 k0 X6 _
Sub clause: 9.3.7.31 r8 t' ?* s% F/ Z3 F, c& y
Sheet No. DSH- 526
# K( y3 ]9 i7 ]- Q, PSubject: Point on wave closing
! b; _# |: D# ]+ [Key words: - short circuit test - point on voltage wave
6 k- K5 J- R. |; d& k* {Decision taken at 40th CTL meeting 2003
' u* U, l a( J1 _" s0 oQuestion: F0 f. x8 w1 |1 Z2 N$ ]5 h
The issue concerns IEC 62019: 1999 (Auxiliary contact units) test procedure 9.3.7.3 in the test at
$ D2 h$ t7 Y0 h- z) q1 gconditional short-circuit current (9.3.7). SC 23E is concerned that there may be discrepancies in test
4 m" h2 j3 ^- {8 Bresults made by different test stations, or at different times by the same test station due to the short7 B% ^% K: ^* H* t5 N
circuit being initiated at different points on the voltage wave.5 @1 ^: q. M4 L' z8 n( x
Rationale:6 E1 q, V" _6 z: ]+ C! p$ Q
At the meeting held in Beijing, SC 23E has asked that the improvement that they have made to the
: \; n4 r# a, k Ustandard be used by the CTL, as it will improve the repeatability of tests. According to IEC procedure
" V6 D& O Z1 v4 q7 \4 Gfor technical work, this modification can only be introduced in the maintenance of IEC 62019, which
$ b. e2 {; R1 f% e: K$ G2 F$ Pmay imply some years before being endorsed in revised publication.+ X% m; i# P+ _2 Q( e6 i
Decision:
3 U: B7 q# ?( H* |( c6 d+ M8 TIn performing the test of clause 9.3.7.3 of IEC standard 62019, the following revised test method
0 N! F6 A9 _9 j: Q+ ishall be used:! }* w" Q( b% C. F$ r
The procedure requires that the contact unit, in the closed position, be subject three times to short4 G* l5 b$ [/ W, g
circuit, which is cleared by a short circuit protective device installed in series. Clause 9.3.7.36 b! o0 | w: B/ D; P( t! B% y
specifies three operations. For the first operation, the making switch is synchronized with respect to6 ~& U' n# t8 L( T, c7 m
the voltage wave so that the circuit is closed on the point 0° on the wave. This point is then shifted by
$ T) D- M( p0 S30° for the second operation and to 60° for the third operation.
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