DSH 643 Measured limiting voltage

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DSH 643 4 H; ]3 Q3 y- m' ?

Measured limiting voltage : H" K0 u$ |( W3 j. G$ m

7.5 a), 7.5.4 a) ( o7 x( w( J; w- Y2 m

61643-1(ed.2) 3 E4 ~  j% T/ O& S0 W4 j& O0 |8 M

2 _9 C* p' d6 ?, e" W2 @- B6 ^Standard(s)-(year and edition):
IEC 61643-1, 2nd edition, 2005-03
Sub clause(s): 7.5 a)  7.5.4 a)
. C) p. s: j9 N. h4 ^8 H( u# NDSH- 643
Subject:
9 g( U: \, U2 S# }! ]' DMeasured limiting voltage
Key words:
- measured limiting voltage
- protection level
- energised testing
( J% }' N) K9 w: S! XApproved by the 45th CTL plenary meeting 2008
Question:
Testing of one port SPDs according to test class III (Type 3):
Should the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?
Rationale:
Clause 7.5 a) of the standard requires:
- x  n( _6 `$ J& yAll one-port SPDs shall be tested unenergized. …
Clause 7.5.4 of the standard requires:
a) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.
' I1 [, E4 e0 E. cAs testing energised may give higher measurement results, the test should be performed energised
5 \: c+ k7 k4 z7 k9 ~" m* J* G! J& @Decision:
% S3 B- P9 W3 rThe test shall be performed with the SPD being energised at Uc.
0 S( G1 {. w4 }
1 r2 c( w; c; Z8 R