Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1986-06-11
1987-06-16
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
307252C, 361 86, 361100, 363 54, 324158SC, H02H 7122
Patent
active
046740236
ABSTRACT:
For recognizing the blocked state of a thyristor which can be switched off (GTO thyristor), especially also if it is alloyed through or the driver addressing the thyristor is defective, a state signal indicating the actual advent of the blocked state is generated after the occurrence of a turn-off signal, if the derivative in time of the gate current has exceeded a positive upper limit, which indicates that the thyristor has been turned off successfully. The maxima of the derivative in time of the gate current are almost independent of the actual anode-cathode current to be extinguished. The derivitive in time of the gate current is advantageously determined via a coupling inductance. Preferably, the method and apparatus are used with a mutual adaptive turn-on interlock of GTO thyristors in converter equipment and can be urged to release protective measures in time if permanent conduction (short circuiting) of a thyristor occurs.
REFERENCES:
patent: 4384248 (1983-05-01), Matsuda et al.
patent: 4600917 (1986-07-01), Seki et al.
Peppel Michael
Salzmann Theodor
Ault Anita M.
Salce Patrick R.
Siemens Aktiengesellschaft
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