Medium voltage switchgear application guide
Medium voltage switchgear application guide
Medium voltage switchgear application guide
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<strong>Medium</strong> <strong>voltage</strong> <strong>switchgear</strong> <strong>application</strong> <strong>guide</strong><br />
Appendix 7: diode and<br />
thyristor <strong>application</strong>s<br />
(cont’d)<br />
The information corresponding should be relay taken must directly be positively from its safe auxiliary and the contacts device’s (opening opening<br />
contact) operating and device. relayed as directly as possible to the thyristor trigger<br />
than In this the case, given the values. arc is maintained in the device as long as the di/dtis higher<br />
MV<br />
+ Vdc<br />
+ Vdc<br />
S4<br />
stop PB<br />
S4<br />
1 NC<br />
KM<br />
tripping<br />
- Vdc<br />
trip.<br />
KM<br />
1 NO<br />
MV side fault<br />
1 NC<br />
MV<br />
+ Vdc<br />
LV<br />
K1<br />
1 NO<br />
K1<br />
LV contactor<br />
- Vdc<br />
LV =<br />
M<br />
=<br />
The vaccum technology allows the breaking in every cases<br />
date<br />
11/94<br />
- B•3•2 -<br />
revised<br />
05/2004<br />
page 14
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