Process for the fault monitoring of an electric valve

Details Process for the fault monitoring of an electric valve Process for the fault monitoring of an electric valve

1987-05-26

1989-11-28

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

340635, 363 68, G08B 2100, H02H 710

Patent

active

048840254

ABSTRACT:
With electric valves (7) having several series-connected thyristore (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 direction, apart from at least one thyristor being tested, are triggered within a predeterminable triggering interval. If a valve current (i.sub.R) then flows, an indicating and registering device (A1 . . . An) indicates in which thyristor stage the defect has occurred. This status check is preceded by a preliminary 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 (i.sub.R) occurs, a triggering channel fault signal (S.sub.U0) is generated.

REFERENCES:
patent: 3342337 (1974-10-01), Ekstrom et al.
patent: 4025845 (1977-05-01), Lhommelet et al.
patent: 4471301 (1984-09-01), Duwo et al.
patent: 4633241 (1986-12-01), Casteel et al.
patent: 4675800 (1987-06-01), Seki et al.
patent: 4685045 (1987-08-01), Baraban et al.
Camenzind, "Improved Circuits for Testing SCR's", Electronic Industries; Jun. 1965; pp. 93-95.
Willcox; "Thyristor Tester"; Television (GB), vol. 25, No. 8, Jun. 1975, pp. 368-370.

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