METHOD AND DEVICE FOR DETECTING THE FAILURE OF AN EXCITATION CIRCUIT OF A POLYPHASE ALTERNATOR
First Claim
1. Method for detecting the failure of an excitation circuit of a polyphase alternator controlled by a regulator, said method comprising the following steps:
- a) electrical information (Iexc;
Von) is continuously taken from said excitation circuit;
b) the electrical information taken in step a) is continuously compared with a predetermined threshold value (Iref, Vref);
c) a logic state (LT) is continuously determined according to the result of the comparison made in step b);
d) if the logic state (LT) determined in step c) persists for a time at least equal to a predetermined delay time (6), an electrical continuity fault of said excitation circuit is signalled.
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Abstract
The method of detecting the failure of the excitation circuit of a polyphase alternator controlled by a regulator comprises the following steps: a) electrical information (Iexc) is continuously taken from the excitation circuit (1); b) the electrical information taken in step a) is continuously compared with a predetermined threshold value (Iref); c) a logic state (LT) is continuously determined according to the result of the comparison made in step b); and d) if the logic state (LT) determined in step c) persists for a time at least equal to a predetermined delay time (6), an electrical continuity fault of said excitation circuit is signalled. This method is particularly suitable for machines having a rotor equipped with permanent magnets or having a high remanence of the magnetic circuit of the rotor.
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Citations
10 Claims
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1. Method for detecting the failure of an excitation circuit of a polyphase alternator controlled by a regulator, said method comprising the following steps:
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a) electrical information (Iexc;
Von) is continuously taken from said excitation circuit;b) the electrical information taken in step a) is continuously compared with a predetermined threshold value (Iref, Vref); c) a logic state (LT) is continuously determined according to the result of the comparison made in step b); d) if the logic state (LT) determined in step c) persists for a time at least equal to a predetermined delay time (6), an electrical continuity fault of said excitation circuit is signalled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification