DSH 643 Measured limiting voltage

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DSH 643 $ s5 J0 u, t; F

Measured limiting voltage

7.5 a), 7.5.4 a) & k! _, ]* J- P! K' j+ y/ y$ e+ r

61643-1(ed.2) 8 T$ n% ?" w" W! L* H( }3 a

3 R& }  _' Y- nStandard(s)-(year and edition):
1 k- y  I" [& Q2 l9 X- P3 K7 v( qIEC 61643-1, 2nd edition, 2005-03
) g" p; A9 _' N5 V4 n: u# z# ], mSub clause(s): 7.5 a)  7.5.4 a)
DSH- 643
Subject:
Measured limiting voltage
' I' r1 j( R, L4 q9 b7 A2 H8 FKey words:
- measured limiting voltage
4 R, x& q/ Q. B0 O8 R4 _; @- protection level
- energised testing
8 `. z9 N. X- [6 WApproved by the 45th CTL plenary meeting 2008
$ r! Q, j* s: k8 J5 O+ b% AQuestion:
1 K9 l& [$ [# r9 F! LTesting 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:
! @) w- {. j8 _  \0 o3 VClause 7.5 a) of the standard requires:
0 W5 u- g0 C. q& RAll one-port SPDs shall be tested unenergized. …
% r  o4 z0 H2 W6 {! U6 n# xClause 7.5.4 of the standard requires:
4 o9 j( }* i5 [; G" ba) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.
' D- A- B) T# S; r' h+ V6 s8 r8 Q7 FAs testing energised may give higher measurement results, the test should be performed energised
Decision:
The test shall be performed with the SPD being energised at Uc.

# n1 `" R! ~0 D# |" L5 j0 A