Standard Power Line Research Articles

МОДЕЛИРОВАНИЕ ЭЛЕКТРОМАГНИТНЫХ ПОЛЕЙ, СОЗДАВАЕМЫХ КОМПАКТНЫМИ МНОГОСЕГМЕНТНЫМИ ЛИНИЯМИ ЭЛЕКТРОПЕРЕДАЧИ

In the article analysis technique of electromagnetic safety conditions on routes of
 compact power lines (CPL) is offered. As the tool the program complex Fazonord was applied to modeling of CPL modes and electromagnetic fields.
 Results of modeling show that the average levels of CPL electric field strengths exceed a similar indicator for the standard power line by 25…145 %, distinctions of maximums lie within 7… 150 %.
 Especially considerable strength excesses take place at three-segment CPL. By criterion of magnetic
 field strength the return picture is observed: levels of CPL magnetic field strength on 70 … 90 % below
 than in traditional power line, and the best picture of electromagnetic safety possesses the foursegment power line.

МОДЕЛИРОВАНИЕ КОМПАКТНЫХ ЛИНИЙ ЭЛЕКТРОПЕРЕДАЧИ С ТРЕУГОЛЬНЫМ РАСПОЛОЖЕНИЕМ ПРОВОДОВ

Development of methods and simulars of compact lines of an electricity transmission
 of the increased capacity. Methods of definition of the modes of electrical power systems (EPS) on the
 basis of phase coordinates which basis models of elements in the form of trellised equivalent circuits
 with full-coherent topology are were applied. These models and methods are realized in the program
 Fazonord-APC complex providing modeling of the EPS stationary modes and also definition of tensions of the electromagnetic field which is created by power lines of various design. Results of modeling of the modes and electromagnetic fields on routes of the compact power line (CPL) of an electricity transmission of 220 kV with a triangular arrangement of wires are presented. For comparison similar calculations for a standard power line (SPL) of 220 kV of a standard design are executed.

Performance Verification of Power Quality Signals Classification System

Power quality has become a greater concern nowadays. The increasing number of power electronics equipment contributes to the poor quality of electrical power supply. The power quality signals will affect manufacturing process, malfunction of equipment and economic losses. This paper presents the verification analysis of power quality signals classification system. The developed system is based on linear time-frequency distribution (TFD) which is spectrogram that represents the signals jointly in time-frequency representation (TFR). The TFD is very appropriate to analyze power quality signals that have magnitude and frequency variations. Parameters of the signal such as root mean square (RMS) and fundamental RMS, total waveform distortion (TWD), total harmonic distortion (THD) and total non-harmonic distortion (TnHD) of voltage signal are estimated from the TFR to identify the characteristics of the signal. Then, the signal characteristics are used as input for signal classifier to classify power quality signals. In addition, standard power line measurements are also calculated from voltage and current such as RMS and fundamental RMS voltage and current, real power, apparent power, reactive power, frequency and power factor. The power quality signals focused are swell, sag, interruption, harmonic, interharmonic, and transient based on IEEE Std. 1159-2009. The power quality analysis has been tested using a set of data and the results show that, the spectrogram gives high accuracy measurement of signal characteristics. However, the system offers lower accuracy compare to simulation due to the limitation of the system.

A Digital Instrument for Nonstationary Disturbance Analysis in Power Lines

In this paper, a real-time instrument for nonstationary disturbance measurement on power lines is reported. It is mainly based on a digital signal processor TMS320C6711 and on an original algorithm. In this paper, a full description of the realized instrument, which implements the proposed method for disturbance detection and extraction, is described in detail. This paper is completed with an experimental results comparison between a standard power line transient analyzer and the proposed one.