A new methodology for technical losses estimation of radial distribution feeder

Abstract

<span lang="EN-US">Power distribution feeders is one of the key contributors of technical losses (TL) as it is typically large in numbers and scattered over large geographic areas. Traditional approach using classical formulation or time series load flow simulations to determine TL in each and every feeder and feeder sections in all distribution network require is an expensive exercise as it requires extensive modelling of the feeders and voluminous data. This paper presents a simple analytical approach to estimate monthly TL of a radial distribution feeder using analytical approach. TL for each feeder sections are evaluated on a monthly basis based on estimation of the load profile of the load points, peak power loss characteristics and loss factor. Total feeder TL are then estimated as the sum of all TL contributed by each feeder section. The developed models and procedure have been demonstrated through case studies performed on three (3) typical and representative feeders characterized by the different area served, number of feeder sections, load distribution and feeder length. The results shows close agreement (less than 5% differences) when compared with time series load flow simulations. With this model, the approach could be extended and applied to estimate TL of any radial distribution feeders of different configurations and characteristics</span>

Power losses evaluation in low voltage distribution network: a case study of 250 kVA, 11/0.416 kV substation

“…where S is the apparent power of transformer (VA), VL is line voltage in volt, IL is the line current in ampere. The total copper losses (Ploss) under balanced transformer feeder network condition are calculated by (2) [8], [18]:…”

“…In any generation and distribution system, there is no ideal efficiency, which means there is no electrical power supplied and totally consumed by consumers without any power waste or loss. Therefore, as long as electrical power flow in any power distribution components, a certain amount of the power are lost between the generation station and load points [3]. There are several factors that contribute to increase the technical losses in distribution sector such as the quality of the conductors, length of the lines, type of the connected loads and the unbalance in phase loading.…”