Protection arrangement for a brushless synchronous machine

Details Protection arrangement for a brushless synchronous machine Protection arrangement for a brushless synchronous machine

1977-05-11

1978-08-08

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

318181, 361 79, 322 68, 322 25, H02H 708

Patent

active

041060695

ABSTRACT:
In a protective arrangement for protecting a brushless synchronous machine against overvoltage at a field winding which is connected to a rotating excitation rectifier which is fed from an exciter machine, in which the field winding is short circuited by means of a solid state switching element when overvoltages occur, a voltage comparison means is provided to which are fed as respective first and second inputs, a first input voltage proportional to the primary voltage of the exciter machine and a second input voltage proportional to the primary current of the exciter machine with the proportionality constant chosen such that for normal operation of the synchronous machine the absolute value of the second input voltage is lower than the first input voltage and for operation when the field winding is short circuited, the absolute value of the second input voltage is greater than the first input voltage.

REFERENCES:
patent: 3539906 (1970-11-01), Habock
patent: 3548287 (1970-12-01), Blaschke et al.
patent: 3564391 (1971-02-01), Dinger
patent: 3748555 (1973-07-01), Hoffman

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