Ефективність засобів примусового вирівнювання напруженості електричного поля зовнішньої ізоляції газонаповнених трансформаторів струму

Abstract

There have been proposed methods of intensity distribution regulation along external isolator of gas-filled current transformers. This method allows us to estimate the efficiency of the distribution of forced voltage using capacitor plates by changing their design parameters. On the structure of the tire there is a cavity, where the internal passage of the current carrying the particles and grounded elements of the design of the transformer current. Such a constructive solution enhances the distortion of the electric field and forms a sharp uneven voltage distribution and field strength along the insulation structure. In the offered methods the column from sequentially connected insulators is considered, the principal circuit elements of substitution selected a certain capacity of a separate part of the reference isolation center and its partial capacities on the earth and conductive elements. Thus, we can say that to improve the voltage distribution and reduce the heterogeneity of the electric field by controlling the structure of the capacitor. Different variants of constructive decisions for forced equalization of voltage distribution are analyzed, especially in the upper part of the tire near a powerful electrode. The structure analysis showed that the following structural parameters influence on the distribution of capacitance and field strength along the capacitor height: the length of the overlap of the capacitor plates, the length of the capacitor plates and the distance between the individual capacitor plates. The results of thepreliminary estimation of the field intensity distribution are shown in the figure. On the basis of this methodology, software was developed that allows us to estimate the strength of the field at individualpoints along the height of the cylindrical condenser. Thus, it was concluded a possibility of improving of intensity distribution regulation and reduction of non-uniformity of an electric field.