DSH 643 Measured limiting voltage

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DSH 643 . g4 J5 |' R( Z7 t # B! n" \6 }' c

Measured limiting voltage

7.5 a), 7.5.4 a) ) M/ w  i9 o$ {* W5 g$ \3 {

61643-1(ed.2) - \. L2 h. Y3 K# c3 C; C, a6 H

Standard(s)-(year and edition):
IEC 61643-1, 2nd edition, 2005-03
Sub clause(s): 7.5 a)  7.5.4 a)
DSH- 643
- U) A6 M4 `6 L, |0 L, W- PSubject:
; \1 Y2 u- h/ T( nMeasured limiting voltage
Key words:
- measured limiting voltage
- protection level
$ ~+ c; }6 \5 u5 l2 C& O% m- energised testing
/ q' p$ M/ O" o+ |Approved 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?
& K5 H% ^; C3 Y2 P8 s) o6 BRationale:
Clause 7.5 a) of the standard requires:
All 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.
As testing energised may give higher measurement results, the test should be performed energised
- a6 J: O3 [; o7 a# Z* DDecision:
The test shall be performed with the SPD being energised at Uc.
$ h- M5 `+ u# M+ K4 K! i) ?* N, ]
& y3 A, B. {2 L5 W