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|  DSH 643) v/ T, `- E1 o% p# ?& L
8 \/ g9 O+ K- O
| Measured limiting voltage" g7 M& T. Q# M; ~8 k) p1 q
| 7.5 a), 7.5.4 a)
. H" F0 s& e2 ^* o | 61643-1(ed.2)
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Standard(s)-(year and edition):
8 C, ~2 f1 Q7 c2 P9 z7 `% ?IEC 61643-1, 2nd edition, 2005-03, D. L! z% P+ n' s" U
Sub clause(s): 7.5 a) 7.5.4 a)
' ^8 n% J3 Q; F- T) kDSH- 643
5 l8 v/ T2 D( v, PSubject:
: z- z! O+ F- |0 S5 B2 m9 wMeasured limiting voltage( O0 O5 u6 \/ V' j( d/ u5 B8 G) N
Key words:
5 E. M9 H/ c* ?0 _1 f! \1 l6 x6 e+ a2 b- measured limiting voltage8 x" d5 y9 v8 s: ~
- protection level! v9 Z+ @; x6 M7 T9 \/ m1 U t
- energised testing4 E7 L& }3 N3 W2 r4 B
Approved by the 45th CTL plenary meeting 2008) p1 Y2 c! l8 a% a
Question:! l: {8 J* _$ F, c; r
Testing of one port SPDs according to test class III (Type 3):. E R3 o6 g! z7 W8 y$ y- c' s7 i% F" A& T
Should the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?
2 @4 K+ X) l$ B0 F4 gRationale:
}/ f1 ?2 c& K$ X# s3 sClause 7.5 a) of the standard requires:6 {) p4 _* w% i" ^& o) D$ v
All one-port SPDs shall be tested unenergized. …( b4 X* m( T/ r3 R& D6 B. z9 U
Clause 7.5.4 of the standard requires:
) u7 L3 H9 a- T, ^; Ha) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.7 h: B* o, y4 W- `. E+ b4 w; ^
As testing energised may give higher measurement results, the test should be performed energised
# s. j$ D' A7 c. ~& T- JDecision:
, }5 Z2 u- P7 {2 ~) _The test shall be performed with the SPD being energised at Uc.' H+ [ B; O% H/ W# J
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发表于 2012-11-7 19:13
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