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|  DSH 643
4 @+ N/ b3 q5 @' H. ~5 B& D' k( x; ]9 L% E# }. b; O+ _
| Measured limiting voltage0 k; {! [; z) U: }0 [* w
| 7.5 a), 7.5.4 a)& t: p1 B. A R" t0 {5 c @/ F
| 61643-1(ed.2)/ s8 l/ D- A9 T. l" O% r
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, @; e% Z0 j% L# O( I4 c dStandard(s)-(year and edition):
]/ `% v U: k% Z& wIEC 61643-1, 2nd edition, 2005-03# E9 A3 X: {' ~, ?0 Q
Sub clause(s): 7.5 a) 7.5.4 a)
0 |) Q4 ~& Q5 hDSH- 643
y! b2 X& b! Q+ iSubject:
+ S0 h! j8 o( Q5 I( Q1 B- BMeasured limiting voltage4 T; M: M, G! G0 t3 C, \+ W; c
Key words:7 u# U% y/ B- _ E* n2 Q
- measured limiting voltage4 K$ B$ e' x6 a4 v F& S% d5 ?
- protection level4 D9 K/ H& U5 n( B. g6 u
- energised testing
0 O6 ?! b, m0 I$ t) HApproved by the 45th CTL plenary meeting 2008
% f. M+ I6 j9 w; ZQuestion:
% ~) O1 ^" O, |" ]6 g3 f2 D) L! STesting of one port SPDs according to test class III (Type 3):
9 h# y9 T" i) c* q& xShould the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?" y4 Q5 G, n* ^" e
Rationale:6 m( }8 n" }+ H
Clause 7.5 a) of the standard requires:& w+ a/ F9 Q6 s- v, L
All one-port SPDs shall be tested unenergized. …2 p1 \' l5 F. q
Clause 7.5.4 of the standard requires:
' R& |% [6 r# G4 _6 ~1 {a) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.
0 v6 a' O0 x3 T3 y) t" n; n/ F* ~As testing energised may give higher measurement results, the test should be performed energised$ ^3 x0 t) T3 C9 X5 d* c
Decision:" E4 k4 ?* v& j
The test shall be performed with the SPD being energised at Uc.
" V8 |# a) N: {* t" v: @: D8 n* ~; @ " `# l3 g5 e) R; q2 C0 q
6 [( ~* {& D8 M: V3 j* ]9 v; b1 |( i |
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发表于 2012-11-7 19:13
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