Journal ArticleDOI
Measurements of RIV on Large EHV Apparatus in High Voltage Laboratory
TLDR
In this paper, the measured levels of RIV for EHV apparatus may be unrealistically high at 1 MHz due to an internal resonance in the test circuit, which cannot be corrected by the application of the Circuit RIV Factor "p" since the circuit responses of the calibration and test set-ups are different.Abstract:
North American practice for the measurement of Radio Interference Voltage, (RIV), on EHV apparatus is specified by the NEMA 107 Standard. The recommended measurement frequency is 1 MHz but at this frequency physically large test circuits do not represent the service condition. The measured levels of RIV for EHV apparatus may be unrealistically high at 1 MHz. This phenomenon is caused by an increase of RIV signals due to an internal resonance in the test circuit. This increased reading cannot be corrected by the application of the Circuit RIV Factor "p" since the circuit responses of the calibration and test set-ups are different.read more
Citations
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Proceedings ArticleDOI
Investigations on the Corona Performance of a Ceramic Disc Insulators Integrated with Field Reduction Electrode
Subba Reddy Basappa,Udaya Kumar +1 more
TL;DR: Comparisons are made for the experimental results of the potential distribution across the insulator string (with and without filed reduction electrode) with the simulation results obtained by using Surface Charge Simulation Method.
Journal Article
Partial discharge classification through wavelet packets of their modulated ultrasonic emission
TL;DR: In this article, an efficient scheme for neural network recognition of partial discharges is proposed based on wavelet packets features of their modulated ultrasound emissions, which led to successful classification up to 100% when longer duration signals are processed.
Proceedings ArticleDOI
Neural networks recognition of weak points in power systems, based on wavelet features
TL;DR: This paper develops an effective pattern recognition scheme, employing wavelet feature extraction and Artificial Neural Network classification, to identify the basic weak-points and two weakpoint combinations, based on their modulated ultrasonic emissions.
Book ChapterDOI
Partial Discharge Classification Through Wavelet Packets of Their Modulated Ultrasonic Emission
TL;DR: Based on wavelet packets features of their modulated ultrasound emissions, an efficient novel scheme for neural network recognition of partial discharges is proposed and employed preprocessing, wavelet features and near-optimally sized network led to successful classification up to 100%, particularly when longer duration signals are processed.
References
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Journal ArticleDOI
Analysis of Radio Noise From High-Voltage Lines I-Meter Response to Corona Pulses
TL;DR: In this article, the authors describe some basic characteristics of corona discharges and radio noise meters and establish a general approach for radio noise analysis on highvoltage lines, which is demonstrated by tests.
Journal ArticleDOI
The Relationship Between the Picocoolomb and Microvolt for Corona Measurements on HV Transformers and Other Apparatus
R. T. Harrold,Thomas W. Dakin +1 more
TL;DR: In this article, partial discharge or corona measurements in MV have been used for transformer quality control and customer acceptance, but in the future it is anticipated the pC unit may also be used.
Journal ArticleDOI
Radio Noise Meter Response to Random Pulses by Computer Simulation
TL;DR: In this article, the response of the conventional radio noise meters to random pulses is investigated using digital computer simulation, which represents more closely the detector output circuit of a radio noise meter, and the results show that the degree of randomness, both in amplitudes and separation intervals, of the pulses increases, the quasi-peak value becomes roughly proportional to the rms value.
Journal ArticleDOI
Calibration and comparison of partial-discharge and radio-interference measuring circuits
E.M. Dembinski,J.L. Douglas +1 more
TL;DR: Methods of calibrating circuits for measuring partial discharges and radio-interference (r.i.) voltages are discussed and it is concluded that for many applications either a discharge detector or an r.i. meter will enable both discharge magnitude and r.
Effet couronne en tension alternative
TL;DR: In this article, the authors define the limites du niveau-perturbateur and define a set of criteria for determining whether a given perturbation is a good fit for a particular application.
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