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Session 2433

Electric Demand Calculations as a Critical Component of Power Distribution System Design and Analysis

Ilya Grinberg, Petro Gogolyuk

Buffalo State College/ L’viv Polytechnic National University

1. Introduction

Calculation of electric demand is one of the most important procedures in design of a power distribution system (PDS) of any facility. Since demand is calculated at the very early stages of design, it significantly influences selection of the rest of the PDS elements as well as its technical and economical indices. Such parameters as capital investments and energy losses, to name a few, depend on the accuracy of demand calculations. If calculated demand is less than actual, additional energy losses, aging of insulation, and premature failure of PDS’s elements will result. On the other hand, inflated demand results in unjustified expenses and inefficient utilization of electrical equipment and wiring system1,2 . Obviously, engineering education should reflect best and innovative engineering practices as well as traditional ones. Implementation of the methodology discussed in this paper provides such a venue as well as gives students more insight into energy conservation issues right at the beginning of the design process.

2. Basic Definitions

Total Connected Load - the sum of the continuous ratings of the load-consuming apparatus connected to the system or any part thereof. The value of total connected load is a rather certain number because it is usually known. The sum of the continuous ratings of the load-consuming apparatus permits us to roughly estimate the upper limit of the rated demand (see below) of the group of consumers. The group’s connected real power is the sum of connected real powers of individual loads within the group. The group’s connected reactive power is the sum of connected reactive powers of individual loads within the group. n Pcon = p1 + p 2 + p3 + ... + p n = ∑ pcon ,i (1) i =1

n n Qcon = q1 + q2 + q3 + ... + qn = ∑ qcon ,i = ∑ Pn tgθ (2) i =1 i =1

Proceedings of the 2003 American Society for Engineering Education Annual Conference & Exposition Copyright © 2003, American Society of Engineering Education

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Gogolyuk, P., & Grinberg, I. (2003, June), Electric Demand Calculations As A Critical Component Of Power Distribution System Design And Analysis Paper presented at 2003 Annual Conference, Nashville, Tennessee. 10.18260/1-2--12540