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Standard: IEC 62019: 1999
& o3 D# }* D( I9 V1 eSub clause: 9.3.7.3
/ S K' S( H9 bSheet No. DSH- 526
; @+ K# U- }# f1 {: c' f* u0 E# @Subject: Point on wave closing
- {, `) J8 F" ^) _3 M X- b9 C* vKey words: - short circuit test - point on voltage wave
: |# u" s4 c. M: f5 p! GDecision taken at 40th CTL meeting 20032 R6 n# T2 V1 j1 f `7 O N: w
Question:
; k+ }2 Y; [5 V, S# C2 J! \The issue concerns IEC 62019: 1999 (Auxiliary contact units) test procedure 9.3.7.3 in the test at, H; I: G, ]" |& d0 `
conditional short-circuit current (9.3.7). SC 23E is concerned that there may be discrepancies in test, ]" X8 L4 `9 k0 V; ^
results made by different test stations, or at different times by the same test station due to the short
3 _0 L/ z3 f3 x7 i1 A3 ^circuit being initiated at different points on the voltage wave.4 _1 m+ C- T8 {+ f" C
Rationale:, `! J, A0 N+ L& b
At the meeting held in Beijing, SC 23E has asked that the improvement that they have made to the. _/ D$ [: R1 V7 l0 k& i r# L
standard be used by the CTL, as it will improve the repeatability of tests. According to IEC procedure
8 M: Z/ g& o/ xfor technical work, this modification can only be introduced in the maintenance of IEC 62019, which
7 N3 ~' l- {+ D* M u$ tmay imply some years before being endorsed in revised publication.
+ E. f- F4 `! HDecision:) d$ N ?! c- U/ a
In performing the test of clause 9.3.7.3 of IEC standard 62019, the following revised test method; h7 q/ D4 p7 U* A q( U2 ^
shall be used:$ H# _# h* e8 y+ s/ p# X
The procedure requires that the contact unit, in the closed position, be subject three times to short0 o8 X) [' M& r$ s
circuit, which is cleared by a short circuit protective device installed in series. Clause 9.3.7.3' `9 N/ K" F8 Q/ A H+ ?2 o
specifies three operations. For the first operation, the making switch is synchronized with respect to
; T3 l( z$ H/ X) p1 i, p2 n9 e4 P* {the voltage wave so that the circuit is closed on the point 0° on the wave. This point is then shifted by+ u# {+ k. G+ e8 N% }
30° for the second operation and to 60° for the third operation.
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