Sub-harmonic detection and control system

Details Sub-harmonic detection and control system Sub-harmonic detection and control system

H - Electricity

02

J

H02J 3/01 (2006.01) H02J 3/18 (2006.01)

Patent

CA 2362651

A distribution series capacitor control system is provided with a sub-harmonic detection module (100) connected to an input signal and operable to detect the presence of at least two distinct types of sub-harmonic content in the input signal. A logical signal processor (140) is electrically connected to the sub- harmonic detection module (100), and operates to independently determine the existence of self-excitation during induction motor starting and ferroresonant phenomena based upon the at least two distinct types of sub-harmonic content, respectively. A system controller (142) is electrically connected to the logical signal processor (140) and operates to eliminate effects of self- excitation during induction motor starting and ferroresonant phenomena on the system.

Cette invention concerne un système de commande de distribution à condensateur en série qui est équipé d'un module de détection sub-harmonique (100) lui même connecté à un signal d'entrée et servant à détecter la présence d'au moins deux types distincts de composante sub-harmonique dans le signal d'entrée. Un processeur de signal logique (140), qui est relié électriquement au module de détection sub-harmonique (100), intervient pour déterminer indépendamment l'existence d'une auto-excitation pendant le lancement d'un moteur à induction et des phénomènes ferrorésonants, ceci à partir d'au moins deux types distincts de composante sub-harmonique. Une unité de commande système (142), reliée électriquement au processeur de signal logique (140), élimine les effets d'auto-excitation pendant le lancement d'un moteur à induction et les phénomènes ferrorésonnants.

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