Using of non-traditional current and voltage sensors for the fault location

Abstract

Abstract. The article describes the possibilities of using the nontraditional current and voltage sensors to solve the problem of fault location in terms of digital transformers developed at the Ivanovo State Power Engineering University (ISPEU). Frequency and metrological characteristics of current and voltage sensors are given.

Research of the Remote Fault Location Algorithm Based on Sampled Values for Measured Primary Electrical Quantities

“…During the first step, the design expressions were tested in Simulink, where the models of electrical grids and the algorithm itself were implemented. [7]. Then there were researched various options of algorithm realization (using different sensors like Rogowski coil or traditional electromagnetic current transformer with further digitization) and algorithm performance in cases of various distorting factors (e.g.…”

“…The usage of transformers as primary converters for connecting with remote fault location devices helps to improve the accuracy of fault location thanks to their advantages [7]. Presence of several current sensors (including the Rogowski coils) allows one to determine the values of alternating and direct currents and also, physically, the derivative of the input current.…”

Increase of Accuracy of the Fault Location Methods for Overhead Electrical Power Lines

“…For the research of the transient processes during the short circuit and the development of the fault location algorithms, the models of the grids 110-330 kV simpli ed (containing models of ideal current and voltage meters) and integrated were developed in the system Matlab + Simulink [13]. e simpli ed model was used for the research of the e ects caused by some confounding factors.…”

“…e circuit of the real part of the grid with a single supply was modelled for the complex research [13]. ere are taps (downward transformation stations) on the modelled power lines.…”

“…e traditional electromagnetic sensors (current and voltage transformers) have the limited frequency range and the error caused by core saturation [12]. Increasing the accuracy of the fault location methods became possible because of the invention of new innovative digital current and voltage transformers [13][14][15]. Its usage helps to improve the accuracy of the fault location determination, thanks to such advantages as high accuracy of the measurement (current and voltage error ≤0.1%), wide frequency range of the measurement including the direct current measurement, and absence of the saturation caused by short-circuit current and aperiodic component.…”