DSH 643 Measured limiting voltage

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DSH 643 / s0 w" B5 x& e  C / y$ N0 O2 i8 r; r' i6 f

Measured limiting voltage

7.5 a), 7.5.4 a) , {1 j7 E2 \: S& p* {( u7 v% k

61643-1(ed.2) , a# Q! n' D7 F  u! C2 N  x

4 L8 `7 ~8 y/ LStandard(s)-(year and edition):
0 J6 j4 U3 Z; A' C$ j% gIEC 61643-1, 2nd edition, 2005-03
Sub clause(s): 7.5 a)  7.5.4 a)
DSH- 643
4 m( G* F! t+ n4 kSubject:
) d1 i: ]( [( zMeasured limiting voltage
8 f) N" @9 Z, A7 A' hKey words:
- measured limiting voltage
; ?1 c' T# s" q- protection level
- energised testing
Approved by the 45th CTL plenary meeting 2008
& J! X( {* ?% ^9 S) a8 MQuestion:
) r% O) h) G1 Z) Z2 FTesting of one port SPDs according to test class III (Type 3):
" X( L5 K& t6 T( A' lShould the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?
5 u/ d3 ~1 [5 V# K3 u3 KRationale:
Clause 7.5 a) of the standard requires:
/ o6 g4 D! o1 d" \6 e) u# f- ZAll one-port SPDs shall be tested unenergized. …
Clause 7.5.4 of the standard requires:
/ l1 N) D& [- X( b0 Qa) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.
8 e2 b. |9 T  ^) {/ p# pAs testing energised may give higher measurement results, the test should be performed energised
1 j4 c6 z( ]" b+ J) W1 \Decision:
3 g& I+ Z  [9 _* D$ T/ O% \) GThe test shall be performed with the SPD being energised at Uc.


; f" J: d! c+ k' b