Learn More
The primary objective of any electric utility company in the new competitive environment is to increase the market value of the services by providing the right amount of reliability, and at the same time, lower its costs for operation, maintenance and construction of new facilities in order to provide lower rates for customers. The electric utility company(More)
This paper presents probabilistic models developed based on the Poisson probability distribution for determining the optimal number of transformer spares for distribution transformer systems. The outage of a transformer is a random event and the probability mathematics can best describe this type of failure process. The developed models have been(More)
Among the major issues facing utilities in today's competitive electricity market is the pressure to hold the line on rates and provide electricity with adequate quality and reliability. Utilities are increasingly recognizing that the level of supply reliability planned and designed into a system has to evolve away from levels determined basically on a(More)
A proactive approach to determining power quality by monitoring voltage disturbances and harmonic levels dictated by a power quality survey program is discussed. The authors present and discuss in detail some of the key objectives of the power quality program. A methodology for quantifying power quality as experienced by customers in a graphical form is(More)
  • D.O. Koval
  • Conference Record of the IEEE Industry…
  • 1989
The author defines and discusses what is a power supply disturbance from various perspectives, indicating what effects power supply disturbances have on sensitive electronic equipment. He presents several case studies on computer performance, clearly revealing the correlation between the distinctive patterns of occurrence of power supply disturbance and(More)
A very popular method utilized in quantifying the benefit of power delivery service reliability is to estimate the customer monetary losses associated with power supply interruptions by collecting data with customer surveys. MidAmerican Energy Company, a Midwest utility, recently performed surveys of its customers in the residential, commercial, industrial,(More)
There is a need recognized in the power industry to identify and utilize a standard tool or a set of tools to analyze the reliability of industrial and commercial power systems. Historically, the reliability results of different reliability methodologies varied significantly and comparisons were extremely difficult, The Reliability Analysis Technique(More)
Power grid reliability impacts could be significant when a large amount of variable wind generation is integrated with the electric power system. The widely used deterministic reliability assessment method is invalid when modeling the intermittency of wind energy sources. The energy-based probabilistic reliability assessment models are required in system(More)
Quantitative transmission-system reliability is a prerequisite in transmission-system planning and operation supplying industrial and commercial customer loads. A utility industry traditionally has relied on a set of deterministic criteria such as the widely used <i>N</i> - 1 criterion to guide transmission planning supplying all customer types, e.g.,(More)
Utilities construct various power system network configurations to service their customers are economically as possible and maintain continuity and quality of service. The authors present a case study of a customer's sensitive computerized processes, which were significantly affected by power-supply disturbances when their system was connected to an(More)