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|  DSH 643
; L- v! H8 A6 b$ W# {7 B& ^' l! k
| Measured limiting voltage
+ V2 A' j4 H; Y1 E | 7.5 a), 7.5.4 a)3 o! W. k' _: `4 f: m0 j( y- e& R3 v
| 61643-1(ed.2). j* Z. Y* H- P. K, D- O% |0 H. x: A. d6 x
|
& j/ H* ~; E0 |# {! a( y
Standard(s)-(year and edition):
) V# s; G+ L3 S9 @IEC 61643-1, 2nd edition, 2005-03
. m+ ^# `5 T {. h, p1 SSub clause(s): 7.5 a) 7.5.4 a) ' r' n7 l! m( w8 \3 e
DSH- 643; m; M$ t$ p3 T8 H4 t' \0 m) ^
Subject:
" b/ I/ O9 W% M1 O& e9 N0 FMeasured limiting voltage& |5 P! |9 E( ?, b
Key words:
, |$ A- f, V+ p- measured limiting voltage- ]3 e: ?, g, Y4 S9 U; t7 v. Z' [- n6 q
- protection level
8 [+ w0 [& J1 A* f/ X. t- energised testing4 P1 ?+ S/ u3 V* L
Approved by the 45th CTL plenary meeting 2008
9 c% Z: }8 y8 nQuestion:! ^7 n6 W* s7 d% m1 _" D
Testing of one port SPDs according to test class III (Type 3):( |* L' Z: _3 l
Should the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?" ~8 g2 ~1 ]' J+ m% U
Rationale:
; h. m, p5 B& { y+ _Clause 7.5 a) of the standard requires:7 l4 d3 ]- n5 x
All one-port SPDs shall be tested unenergized. …# c: e( V# u. L9 j
Clause 7.5.4 of the standard requires:' ?7 a" U. `) q4 A, @+ r
a) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.# X& c/ x1 C# P! E8 n
As testing energised may give higher measurement results, the test should be performed energised3 W j4 V* q, c: ^
Decision:9 f8 r+ m/ r1 c! A; \
The test shall be performed with the SPD being energised at Uc.) V+ }7 b o' h7 M" |9 a
5 O8 ?7 u4 K' }% F; s; F
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发表于 2012-11-7 19:13
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