DSH 643 Measured limiting voltage

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DSH 643 $ @- @& w- e) l: A2 N. ]

Measured limiting voltage 1 D; M) d  D, a- Z

7.5 a), 7.5.4 a)

61643-1(ed.2) : V% z% b( M/ `( L

- S5 x0 p$ z: X# lStandard(s)-(year and edition):
' K$ s" D3 B0 q! A3 {IEC 61643-1, 2nd edition, 2005-03
Sub clause(s): 7.5 a)  7.5.4 a)
  f" m9 V2 F/ DDSH- 643
Subject:
Measured limiting voltage
# |7 m: Y  r/ F5 mKey words:
- measured limiting voltage
, F! g& E8 c7 L. l6 _& u; _- protection level
' }4 ?& E9 ?/ I+ g; {! m# ?- energised testing
Approved by the 45th CTL plenary meeting 2008
Question:
Testing of one port SPDs according to test class III (Type 3):
: i' }2 ^+ _0 {9 a' X, @  d2 KShould 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:
3 ?2 ~% l: V6 I' 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.
, V2 s, C: ~+ S( aAs testing energised may give higher measurement results, the test should be performed energised
Decision:
+ r# B+ U4 s" C( U2 |1 IThe test shall be performed with the SPD being energised at Uc.


4 R7 N) u* L" }  B; X: k