THE OFF-LINE DIAGNOSE OF AUTOMATIC CIRCUIT BREAKERS BY THE TIME DOMAIN AND FREQUENCY VIBRATION ANALYSIS
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
This paper presents a methodology for determining the operation time at opening and closing of the circuit breakers, using multi-channel sound and vibration analyzers. All the tests on the circuit breaker are made according the prescriptions of normative [3]. It is noteworthy that all tests prescribed by normative [3] are based on preventive diagnosis. This paper approaches the issue of predictive diagnosis of circuit breakers by proposing an original method of comparing the "witness pattern" to "actual pattern" by the Dynamic Time Warping algorithm (DTW). This algorithm is developed by the Megger Company from Sweden and use FFT frequency analysis and time domain analysis. To determine the speed and time of closing-opening for circuit breakers, the authors used sound and vibration analyzer Svan 958, which has triaxial accelerometers for vibration measurements, and offers the opportunity to make independent measurements on three phase. Using the multi-channel analyzer in diagnosis of circuit breakers, have the following advantages: enable the opening and closing times determining; by comparing the amplitude-time characteristics can be determined the non simultaneity of phases L1, L2 and L3; the setting possibilities of the SVAN 958 analyzer to determine acceleration, velocity or displacement, allow dynamic behavior analyzing; the frequency analysis by selecting 1/1 octave or 1/3 octave allows the analysis simplification by the method of Dynamic Time Warping in the predictive diagnosis procedures of circuit breakers.
Authors and Affiliations
Horia BĂLAN, Aurel BOTEZAN, Mircea BUZDUGAN, Elena STEFAN, Gabriel PIRV, Petros KARAISSAS
Keywords
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