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|  DSH 643" W" j' O6 r! L0 D' L
R. [# r* s% ?2 x
| Measured limiting voltage
( }) @0 y3 B- Y9 K( h | 7.5 a), 7.5.4 a)
. |1 P0 d" ~2 U | 61643-1(ed.2)
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8 b3 l& f( T% e% i6 hStandard(s)-(year and edition):' \3 m) K/ a4 P- U
IEC 61643-1, 2nd edition, 2005-03- S K0 Q/ [ J; P
Sub clause(s): 7.5 a) 7.5.4 a) - T( n8 i* V, ^2 J/ }/ D
DSH- 643- d+ v1 E6 d- C6 A/ M6 M* o2 m d
Subject:* N* _ e! }' L0 b3 d% \
Measured limiting voltage5 D7 `( j Y& Z+ R/ v& ~" N" T
Key words:- \' F8 V" _: h7 ]3 P
- measured limiting voltage
H* b: H2 U$ p8 _8 k- protection level5 |7 Q! ^* T2 R
- energised testing
! l; }9 ~5 D6 f0 R1 S9 D0 ZApproved by the 45th CTL plenary meeting 2008( p& t+ E1 l3 U2 F
Question:
# M S! H5 ~* JTesting of one port SPDs according to test class III (Type 3):. o: L. V% d8 P- S! Z, a
Should the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?% o3 @* r1 a2 j- b) o2 A* l! c
Rationale:: y$ Z/ Y$ Q* Z, }5 P
Clause 7.5 a) of the standard requires:
N- ?; `8 D7 }; w9 vAll one-port SPDs shall be tested unenergized. …; W3 s. I/ v& s9 h. X/ Z- Z
Clause 7.5.4 of the standard requires:* ?; t+ ]( l3 q! N
a) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.
, K. s5 X" o" s: ~0 _As testing energised may give higher measurement results, the test should be performed energised: ~; M" f) t' n- Z% @( G4 u
Decision:
1 W/ ?8 q# G6 w: W2 a0 ^" S) h) FThe test shall be performed with the SPD being energised at Uc.) u( T- d2 G7 i& r% y9 J$ D4 L
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发表于 2012-11-7 19:13
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