Increase Accuracy of Phase Difference Measurement at Industrial Frequency

Abstract

The necessity of creating metrological support for measuring the loss tangent angle of high-voltage insulation under the action of operating voltage is noted. Requirements for hardware tools are defined. The expediency of using the method of measuring the phase difference of quasi-harmonic signals to create the specified metrological support is shown. A number of improvements to the method have been proposed with the aim of improving the accuracy and speed of measuring devices based on it. The mathematical modeling showed that the modernized method surpasses the one known for speed and accuracy of measurements and can be used to solve the set task. References 10, figure 1, tables 2.

Estimating the failure probability of an instrument transformer cell in the high voltage distributing device using an expert-statistical method

“…When applying the expert-statistical model for determining the probability of a cell failure, the error was ∆ f(D-02) =1-Q apost =0.034, or 3.4 %. The advantage of the developed model over those proposed in [1][2][3][4][5][6][10][11][12][13][14][15] is predetermined by taking into consideration the influence of a TC of each piece of equipment of the cell on a failure probability, and by the integrated assessment of controlled diagnostic parameters that influence the TC. This leads to the higher accuracy of the forecast, in compar-ison with existing methods of current control over the TC of electrical equipment.…”

“…The global nature of the issues related to energy security raises the question of improving the existing approaches to control the reliable operation of power equipment, in particular the equipment of power supply systems. Thus, works [1,2] report the results of studying the method improvement and the measurement devices that control insulation under a working voltage. However, the issue of the comprehensive evaluation of the investigated apparatus remained unresolved.…”