Power quality and losses in 0.38 kV rural distribution networks

Igor V Naumov,Marina N Yakupova,Alexander N Tretiakov,Elvira G Fedurinova,Dmitriy N Karamov,C Rehtanz,N Voropai

doi:10.1051/epjconf/201921701012

Abstract

The guidelines for the design of rural and urban power supply systems do not consider the issues of reactive power compensation and reduction in additional losses due to unbalanced and non-sinusoidal conditions. At the same time, today’s rural power consumers have a great number of non-linear loads in their residential premises. Moreover, the unbalanced phase currents and voltages are an established fact. The paper aims to demonstrate the extent to which power quality and losses vary in real rural 0.38 kV networks. To this end, the objectives were posed to study the operation of two facilities: 1- switchgear at the cottage (with an installed capacity of 15 kW); 2- switchgear at the communal entrance hallway for 60 apartments in an apartment building (with an installed capacity of 75 kW).

Highlights

Numerous studies on the improvement in power quality and the reduction in power losses [1,2,3,4,5,6,7,8] indicate that solving these problems can significantly improve the efficiency of power supply to various household and nonhousehold consumers
The ever-increasing number of different loads in residential premises has changed greatly the nature of electricity consumption, the need arises to revise some guidelines for the design of their power supply systems
As is evidenced by the results obtained by measuring with a certified device, the power quality at the connection point of the consumer is within the permissible limits of the Standard

Summary

Introduction

Numerous studies on the improvement in power quality and the reduction in power losses [1,2,3,4,5,6,7,8] indicate that solving these problems can significantly improve the efficiency of power supply to various household and nonhousehold consumers. In a cottage, where the installed capacity and, correspondingly, the calculated load are much less than those in the apartment building, the values of the coefficients characterizing the non-sinusoidal phase and phase-to-phase voltages do not exceed the limits set by the Standard during the entire measurement interval. The time diagrams of changes in phase currents at the input to a cottage are shown, and at the input to an apartment building - Fig. A6.

Results

Conclusion