C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
356/24
C07D 401/04 (2006.01) H02M 1/088 (2006.01)
Patent
CA 1281143
ABSTRACT OF THE DISCLOSURE With electric valves (7) having several series-connected thyristors (T1 ... Tn; T1'... Tn'), individual thyristors may become defective, so that they do not withstand the blocking voltage applied to them. For the simplified checking of such defects, a process is specified which does not require any individual monitoring on the spot, i.e. for high potential. For this purpose, in the blocked state of the valve (7), all thyristors of one current direct- ion, apart from at least one thyristor being tested, are triggered within a predeterminable triggering interval. If a valve current (iR then flows, an indicating and registering device (A1 ... An) in- dicates in which thyristor stage the defect has occured. This status check is preceded by a pre- liminary test in which it is checked whether all thyristor triggering channels are in order. All thyristors are triggered in this test. If no valve current (iR) occurs, a triggering channel fault signal (SuO) is generated.
538292
Bbc Brown Boveri Ag
Swabey Ogilvy Renault
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