The measurement and the harmonic analysis of the resistive Ieakage current present is an eificient parameter for determining the degradation level of metal oxide surge arresters. In this paper, the methodology and results of a novel circuit for measuring the resistive leakage current in metal oxide surge arresters is described. The technique requires the digital acquisition of the voltage applied to the surge arrester and the total current of the arrester. A virtual bridge has been implemented in software Matlab@ to eliminate the capacitive component. In this implementation the resistive leakage current waveform is computed without the need for an expensive high voltage capacitor, The implementation suggested in this paper agrees well with measurements obtained with a coupling capacitor.
The DRM (dynamic contact resistance measurement) in high voltage circuit breakers is a manner of evaluating the internal ageing condition of the chamber. DRM is similar to static contact resistance measurement testing, but instead of measuring a single value when the breaker contacts are closed (static value), the ohmic resistance is measured at various contact positions, from the beginning of the contact opening until a complete separation of the contacts. The relationship between the contact resistances of the new circuit breaker and the ageing circuit breaker in operation provides subsidy for the evaluation of both the main and arcing contact conditions. This research aims to analyze the correlation between the various levels of degradation of the contacts and the configuration of the DRM curve. This work considers curve samples from new breaker chamber contacts and different levels of degradation by acceleration tests.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.