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RPROP network is applied to fault diagnosis of analog circuit in time domain and frequency domain. Also the diagnostic results are made use of fuzzy logic to carry on further diagnosis in time domain, frequency domain and comprehensive domain integrated the two domains. Analyses indicate that fault diagnosis of analog circuit using neural network and fuzzy logic in comprehensive domain is effective...
In view of the difficulties caused by component tolerance, a method based on principal component analysis (PCA) is proposed for fault detection of analog circuits. The basic model of the proposed method and the general rule for analog fault detection are described in detail. At first, the principal component model of fault-free circuit is constructed. Then the circuits-under-test are compared with...
The fact of a dominant resonance frequency existed in the transient process of short-circuit fault is discovered by analyzing transient characteristics of single-phase earthed fault. At this frequency, the magnitude of zero modal current in faulty feeder is much larger than that in healthy feeder, and their phase is approximately opposite. Dominant transient frequency(DTF) zero modal current in faulty...
The fact of a dominant resonance frequency existed in the transient process of short-circuit fault is discovered by analyzing transient characteristics of single-phase earthed fault. At this frequency, the amplitude of zero modal current in faulty feeder is much larger than that in healthy feeder, and their polarity is approximately opposite. Transient dominant frequency zero modal current in faulty...
Fault line detection in distribution system is a problem. In this paper, method of the module maximum value is employed to analyze the electric information after the fault, and to respond the abrupt change of zero sequence currents, and through comparing the change of the zero sequence currents on all lines' polarities and magnitudes, then the fault line can be determined. With the using of inner...
With the rapid advancement of fab process technology into the nanometer node era, there is an increasing trend in the manifestation of deep submicron (DSM) marginal defects in integrated circuit (IC) fabrication. Despite transition delay fault (TDF) tests providing reasonable coverage against DSM marginal defects, this methodology is hampered in designs with multiple clock domains where the lowest...
A novel protection technique using parameter identification is proposed. According to the electric network theory, there are fixed relationships among the stimulated signals, the network parameters and the actual responses. This means that it is possible to identify the network parameters using measurement data from stimulation and network response. Any electric component to be protected can be considered...
This paper proposes a fault classification scheme for transmission lines based on spectrum of fault component. First it analyses the spectrum of fault component, then the characters of power frequency and nature frequencies in two data windows are used to identify fault type and fault phase respectively. The scheme performance was proven using ATP/EMTP simulations in a 500-kV power system considering...
Using the separability of the Volterra spectrum with the amplitude modulation (AM) stimulation, an approach of characteristic extracting for weakly nonlinear circuits diagnosis is presented based on the Volterra frequency domain slices (VFDS). Based on VFDS decomposition, the nonlinear diagnosis problem can be implemented on linear sub-circuits, and the phenomenon of faults characteristicpsilas overlap...
Presented work focuses on detecting a single hard fault in analog electronic circuit in AC domain. The combined approach to analog circuit fault test frequency selection is proposed. Reduction of a fault dictionary size is the main goal of the method. It is achieved by the use of heuristic algorithm and modified fitness function. Simulated annealing as a search engine and fuzzy system as a fitness...
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