DSH 643 Measured limiting voltage

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DSH 643

Measured limiting voltage

7.5 a), 7.5.4 a)

61643-1(ed.2) 8 t- d, s) _* f1 v' v1 A

Standard(s)-(year and edition):
IEC 61643-1, 2nd edition, 2005-03
Sub clause(s): 7.5 a)  7.5.4 a)
: m. A- i0 k9 U. z# vDSH- 643
( _) \8 U# T0 t' X5 \) S" S% OSubject:
9 \* ?; K6 c3 _& k% A/ xMeasured limiting voltage
Key words:
- measured limiting voltage
- protection level
- energised testing
! W3 `7 l0 g- E1 X2 L5 AApproved by the 45th CTL plenary meeting 2008
  D7 \, U& V3 b  G3 Y, {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?
- ^9 [+ ?. J+ w6 e8 X  jRationale:
Clause 7.5 a) of the standard requires:
& e( ]9 _, g9 V: A0 QAll one-port SPDs shall be tested unenergized. …
) Z9 x; z6 z1 U! C; T+ t0 N4 yClause 7.5.4 of the standard requires:
1 \& R  @: L3 w& T( Wa) 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
/ D) I( @( m5 Q4 i  U' SDecision:
0 [) z+ g# f5 ]' Y& D- dThe test shall be performed with the SPD being energised at Uc.
9 O& j0 X1 z+ [& G% @0 z: c( e