Measured limiting voltage . }0 Z! ]" A8 B( W, b' l& d
7.5 a), 7.5.4 a)+ c% v0 F- z# |. D
61643-1(ed.2) b. I; P& q5 {" x3 J# Z- F
8 P' _0 M% v' h! N0 e+ d7 CStandard(s)-(year and edition): $ V: [4 w7 O7 h) r% nIEC 61643-1, 2nd edition, 2005-030 K- F* o! R- V
Sub clause(s): 7.5 a) 7.5.4 a) ) A$ T5 m: i* d2 T) o/ D! n
DSH- 6438 P% n+ X% h6 ^9 Q
Subject: & {5 ?0 M. N8 HMeasured limiting voltage8 h5 t7 F3 ^: P# F# A9 L/ u
Key words:2 r9 C% B/ _# A* P3 r6 M6 U4 D
- measured limiting voltage; C+ J' x" |* P0 v6 L7 u
- protection level + B2 P$ |+ Y6 j# h, ?" X {- energised testing9 u$ ]* d/ T7 p) W2 d
Approved by the 45th CTL plenary meeting 2008- X: P: V% `: Z
Question: % U# A8 x% L- S! eTesting of one port SPDs according to test class III (Type 3): v% ?2 z; p& \5 C( u
Should the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?: }* p; @% R q; O* ^
Rationale: ; k; G7 C* p, f8 j: M6 }Clause 7.5 a) of the standard requires:% @& F' H* k3 Z# Q" [ _: `/ }. h
All one-port SPDs shall be tested unenergized. …! m* h* u+ R% r0 g
Clause 7.5.4 of the standard requires:. @) W2 h+ q7 w' Q5 s o
a) The combination wave will be applied to an energized SPD, with the mains voltage at Uc. / q; m1 t! Y5 }+ D; SAs testing energised may give higher measurement results, the test should be performed energised 0 B' Q* s( |! E- w' z8 NDecision:) f" f5 Y) w" [
The test shall be performed with the SPD being energised at Uc.1 g+ s: A& d% G1 s% {! |2 n
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[attach]77213[/attach]% T, n' I3 d3 H7 M7 g/ m0 k% @
DSH 643