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|  DSH 6431 w/ j) ^! B3 K, A# \$ a8 z2 t
5 t1 w$ K7 R$ q% b! F$ J0 V0 L | Measured limiting voltage. c$ o+ F# |+ k/ X! V4 A+ K4 @
| 7.5 a), 7.5.4 a)
, U/ ^8 k/ G \0 Q | 61643-1(ed.2)
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) h) U: J# T0 OStandard(s)-(year and edition):
, p( E& A8 C) C1 p9 yIEC 61643-1, 2nd edition, 2005-03! l+ A9 @/ z) H6 A" Z d3 p* }1 F
Sub clause(s): 7.5 a) 7.5.4 a) 5 N9 j. m: n3 P" p4 ?0 s
DSH- 643
. L# E- A" e/ Y% J8 O jSubject:' G4 l4 q1 U4 G/ O0 v; J. i
Measured limiting voltage
; [' q* K8 q4 K) s9 A4 A4 MKey words: P& ]% u" A6 i4 G& g0 S8 m
- measured limiting voltage# a0 ~( p; v: _- v9 G7 k5 m
- protection level
8 P. U: @. G% T3 ]. L$ A x- energised testing* K) j# @+ W3 D, y" ^) N" \' \
Approved by the 45th CTL plenary meeting 20084 g( Z. ^! n2 }5 h0 p1 r) @
Question:; ?# z9 y; d7 A8 ~3 s. p. s: }
Testing of one port SPDs according to test class III (Type 3):* _# d% n: Z U! `( [
Should the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?
* ?' r9 A1 [9 |4 `/ ]Rationale:/ t6 x. P9 x! c q3 m
Clause 7.5 a) of the standard requires:" K4 n+ {5 x- @, |" U# ?
All one-port SPDs shall be tested unenergized. …
. S1 k1 E. c! |( u7 bClause 7.5.4 of the standard requires:
1 p! A; H8 V* ^2 \a) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.
& u' Q( U1 r6 U' |$ M& b7 xAs testing energised may give higher measurement results, the test should be performed energised; e! \) T* s4 o0 ?( w2 v' ?1 c
Decision:; M- j$ V" s' P
The test shall be performed with the SPD being energised at Uc.
* x2 _) ]+ \; Z( L4 e+ M # n- i& \7 k+ X4 y
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发表于 2012-11-7 19:13
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