DSH 643 Measured limiting voltage

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 643 8 \' G8 X) S6 h- c) B6 l8 h' l. F6 o 1 ]' C5 ]! T$ |# Q2 t# D

Measured limiting voltage

7.5 a), 7.5.4 a) 4 ?! [: [. f; l- b5 F8 g

61643-1(ed.2) . G/ g# ]5 ~7 R+ v% V  t* H

Standard(s)-(year and edition):
! P5 \5 V% p6 ?! AIEC 61643-1, 2nd edition, 2005-03
Sub clause(s): 7.5 a)  7.5.4 a)
DSH- 643
( X7 m8 T# v+ I& w- n2 d- j  iSubject:
Measured limiting voltage
5 Q/ O0 N" n8 \+ `- v% f+ B. HKey words:
- w& @/ V/ [$ s) H! u- measured limiting voltage
- protection level
- energised testing
: [! e+ s' k. `+ m* Q/ r/ @Approved by the 45th CTL plenary meeting 2008
8 U' Z! {/ m0 T: ~2 `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?
Rationale:
2 _: W5 z2 Q1 DClause 7.5 a) of the standard requires:
4 W& G8 F* G% |+ J; kAll one-port SPDs shall be tested unenergized. …
Clause 7.5.4 of the standard requires:
a) The combination wave will be applied to an energized SPD, with the mains voltage at Uc.
1 t8 \8 U  q( o" [/ wAs testing energised may give higher measurement results, the test should be performed energised
Decision:
7 K' j* R6 L; QThe test shall be performed with the SPD being energised at Uc.
' ]( c) r& S- Y) X+ ^& b
/ ~  s3 x" o3 f' i/ {% r