DSH 643 Measured limiting voltage

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DSH 643

Measured limiting voltage

7.5 a), 7.5.4 a) 2 m) U' x( r' V% t$ H, q/ a+ j/ o

61643-1(ed.2) , d" {& K( \9 U8 t; F  {

+ K1 b, P$ f0 v. KStandard(s)-(year and edition):
( p2 S7 t. g* [  yIEC 61643-1, 2nd edition, 2005-03
  Z) D, ~. e: [* R! u0 NSub clause(s): 7.5 a)  7.5.4 a)
DSH- 643
Subject:
Measured limiting voltage
# e9 ^% L. ^# |/ }Key words:
4 @8 F' ~& i4 Y: `. I- measured limiting voltage
- protection level
% v0 X  s% b$ h, t' q  j1 H9 ]- energised testing
: P- G% ^2 r! `6 x$ K$ A: zApproved 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:
7 f7 X! e6 H, _/ M+ ?All one-port SPDs shall be tested unenergized. …
5 g  F- c' {- o1 Y5 i6 `Clause 7.5.4 of the standard requires:
" R- F5 x! [# ]& E! t* ~: xa) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.
3 X' }5 [6 R  H: ]% {As 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.

  `) g# n4 t, w* s( ?