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|  DSH 643
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| Measured limiting voltage/ y- I$ r; v- j' m) Z# K1 e
| 7.5 a), 7.5.4 a)7 P0 F' c% u c: T& l; O2 w
| 61643-1(ed.2)" L1 c' k" e, p4 b H5 {' N! G m
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8 S5 B$ m/ G7 C! q) K, r6 GStandard(s)-(year and edition):
1 a8 L8 Y3 j4 `0 |7 c( z, g( }IEC 61643-1, 2nd edition, 2005-03
8 r6 J" \3 v- i1 U- A8 l, GSub clause(s): 7.5 a) 7.5.4 a)
3 F; F6 m) Q& m1 j: H) k( iDSH- 643
9 g' O- S# j' d& A/ A$ cSubject:
v/ g! C/ B$ I, n7 PMeasured limiting voltage) N, Q6 O+ x! m
Key words:
! w Q( A, C. E/ |' r; w" \6 S- measured limiting voltage
. ~0 R# f7 {# _$ j( R3 @7 v- protection level+ i0 S5 f& w( n' g& C6 W( I
- energised testing. a7 i# o2 Z# v4 {7 N/ v
Approved by the 45th CTL plenary meeting 2008- V5 u. W4 `( @# y: `
Question:
" n' b5 u, L8 V: J# x4 j4 f0 |; LTesting of one port SPDs according to test class III (Type 3):
( I) C `) g8 z' B2 N3 YShould the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?
3 f: C5 F- W& }7 vRationale:
: t6 k2 c: P9 K5 z8 i( p" o# yClause 7.5 a) of the standard requires:2 H" c% X' R7 s
All one-port SPDs shall be tested unenergized. …' ^" l2 o. W& A% `, B' P
Clause 7.5.4 of the standard requires:
% }8 `! X; [% h4 [a) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.9 r; Z8 v( }8 P. o! M+ y
As testing energised may give higher measurement results, the test should be performed energised8 C! ?$ D& P$ E- r7 E5 n
Decision:5 l L" P; f$ a0 d9 e# ~$ L8 v
The test shall be performed with the SPD being energised at Uc.
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发表于 2012-11-7 19:13
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