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|  DSH 6438 P8 n c5 O/ i& e9 x! e% Y
9 j+ i/ A3 Q: O( C1 _; ? | Measured limiting voltage* d4 k. c& I, S
| 7.5 a), 7.5.4 a)' H1 [6 _/ u, o! F6 G6 t2 ?
| 61643-1(ed.2)
% H% m8 ?. G! \: G8 r- u |
( ?. G4 K/ f1 G7 \( M
Standard(s)-(year and edition):
# s9 z8 l4 T' u, S' k1 w! o4 IIEC 61643-1, 2nd edition, 2005-03 y9 ^( r A3 w# v8 h) w7 ~, x
Sub clause(s): 7.5 a) 7.5.4 a)
% s6 j0 Q" I5 n3 NDSH- 643/ f- \- U. x8 N- T. \7 w: a
Subject:
6 Z% ?4 V$ ]/ E, Y! A& RMeasured limiting voltage
8 H m: y; r% l' UKey words:
1 x' Y% A2 |1 ]9 C; j- measured limiting voltage
* s7 R* r( D2 b$ ~2 W( i- protection level" F' r( m) H( N9 h
- energised testing) s5 u6 r3 ~$ T' S% u k' s8 ~
Approved by the 45th CTL plenary meeting 2008# L) B$ f8 Q! |% l. ]/ `( |
Question:
0 |& w% z2 @! y, d4 _' hTesting of one port SPDs according to test class III (Type 3):3 m& o2 V: ?7 d. w) h
Should the test to measure the limiting voltage with the combination wave be performed with the SPD being energised at Uc or without energisation?: R4 l. S; |0 W$ Z' r h$ F1 X
Rationale:
! U: k) n7 e9 U* RClause 7.5 a) of the standard requires:# ]3 B, p; V. A# L1 t4 Z
All one-port SPDs shall be tested unenergized. …9 T. N. `- Q! \% a
Clause 7.5.4 of the standard requires:
! v1 O) T4 O( m* G, z! S& da) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.
% E) h, ^' q+ ?) j) HAs testing energised may give higher measurement results, the test should be performed energised2 d+ y8 Y. _7 ]5 I# b
Decision:$ T: g- I0 e S8 o7 [8 R5 B; R! H1 i
The test shall be performed with the SPD being energised at Uc.
, H- B+ X6 C' u' U, B% O 6 R3 u8 c V% N! m) w: `
3 @0 _5 n0 K/ H; q5 p) v+ W
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发表于 2012-11-7 19:13
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