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|  DSH 6434 |( g) }# F/ @* q7 E
0 g' A9 w) r: k+ T | Measured limiting voltage7 U. E; ]. X$ {$ A0 W* s M
| 7.5 a), 7.5.4 a)1 y& b$ P( C0 d* K! F: ]
| 61643-1(ed.2): u/ s6 |! j6 W' u) j6 s5 R
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3 X! P4 q/ ]/ W& f# a
Standard(s)-(year and edition):, y2 i1 v0 x$ v* N/ ]+ y% g- w
IEC 61643-1, 2nd edition, 2005-031 [3 u0 P, S9 S
Sub clause(s): 7.5 a) 7.5.4 a)
4 S9 X$ R1 o3 A4 | zDSH- 643- u) e& l/ C- ]" _
Subject:. u" p2 |" c" o. t& x
Measured limiting voltage
- @+ a* J: {2 c% n/ cKey words:7 _6 F+ P$ t, [) h1 i2 b
- measured limiting voltage! z9 ?0 L; R# J9 [& q* l5 M5 n
- protection level
$ v, J! K9 m3 X, q- energised testing7 d) c0 q1 B& Q9 K+ m! E6 k( o6 G
Approved by the 45th CTL plenary meeting 2008
% P3 U: B# A6 k6 x* }& q: d' v' JQuestion:
" X/ ^: ~7 L/ Z9 f/ KTesting of one port SPDs according to test class III (Type 3):
' V( @. Z+ U6 j/ O! j& iShould the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?
! s7 ]! V7 ^4 ]8 iRationale:
6 N" I @1 ~6 Q( |( ^Clause 7.5 a) of the standard requires:; B1 z* ~( n6 [6 C; m! D$ B8 f
All one-port SPDs shall be tested unenergized. …
; R8 M9 R' Y5 f# o$ X/ A3 V& lClause 7.5.4 of the standard requires:' o: \3 c' a& W; E& d9 c
a) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.7 [3 e. E# o! f+ m9 r: ~& _
As testing energised may give higher measurement results, the test should be performed energised) c1 B; \# ]6 N* L6 W) ^& f2 }( p7 I
Decision:3 Z$ h/ \6 Q0 N+ H3 t* W" |3 G* G
The test shall be performed with the SPD being energised at Uc.
, Z0 N4 S2 P$ \4 X9 v* Y, w" \2 a 7 i* s) ?5 S/ q
$ k; c, N0 ~1 z& X- d+ ~4 C |
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