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Rural Electric Power Conference, 1988. Papers Presented at the 32nd Annual Conference

Date 1-3 May 1988

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  • 1988 Rural Electric Power Conference. Papers Presented at the 32nd Annual Conference (Cat. No.88CH2586-6)

    Publication Year: 1988
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    Freely Available from IEEE
  • Capacitor control relaying for switched capacitor banks

    Publication Year: 1988 , Page(s): B6/1 - B6/8
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    The development of an advanced capacitor bank control relay, its measurement techniques, its control parameters, and the applications for which it is suitable are described. The use of the relay in automated distribution systems, typical distribution loss improvements due to an increase in the number of switched capacitor locations, and the need for more accurate controls to accomplish this are considered. The discussion covers power factor control, voltage override, load-current-following capability, biased voltage control, and data-handling and remote control capability View full abstract»

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  • Database design concepts for automated mapping and facilities management (AM/FM) [power system applications]

    Publication Year: 1988 , Page(s): C5/1 - C5/5
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    The differences between a CAD mapping system and a GIS (graphic information system) or AM/FM system are briefly discussed, and some problems associated with power utility applications design from a software development standpoint are pointed out. The point stressed is that utility data retrieval requirements are tricky or nearly impossible and the benefits and caveats of integrating all of a utility's applications into a true GIS or AM/FM system and keeping data requirements prioritized at the same time are explored. A working AM/FM model, its development and the future possibilities of AM/FM are described View full abstract»

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  • Computer aided mapping/drafting performance is limited by plotter capability

    Publication Year: 1988 , Page(s): C4/1 - C4/4
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    Experience with a computer-aided mapping/drafting system using a pen plotter as the output device is discussed. The pen plotter proved to be an unacceptable bottleneck for system productivity, since it took an average of roughly three hours to plot a detail map or special-project map. To overcome this bottleneck, an electrostatic plotter was purchased. Plotting time has been reduced from hours to six minutes or less with multiple-copy capacity View full abstract»

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  • Overvoltages on five legged core transformers on rural electric systems

    Publication Year: 1988 , Page(s): D3/1 - D3/6
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    Five-legged-core, grounded-wye-grounded-wye, three-phase transformers can cause overvoltage conditions on an open phase when the primary is cable fed and single-phase switched. Field and laboratory test results on the overvoltage condition are given. An equivalent circuit of the transformer is evaluated and used to simulate laboratory and field test conditions. Techniques to minimize the overvoltage condition are discussed View full abstract»

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  • Evaluation of alternatives-design of distribution services

    Publication Year: 1988 , Page(s): C2/1 - C2/4
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    It is argued that utility designers have largely ignored the potential for savings available in the proper design of electrical secondaries and services. Improved transformer designs have reduced the losses associated with transformation, but alternatives are also available to the staking technician. Services designed by these technicians will contribute to system losses for twenty to thirty years. Reduction of these losses and the cost of ownership can make a significant contribution to improving utility efficiency. The software system described here allows the staking technician an opportunity to evaluate the cost-effectiveness of the work orders they prepare. The technician compares the cost of various alternatives and also determines whether the design chosen meets all applicable standards of service View full abstract»

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  • The TOROFORM transformer-the inside story

    Publication Year: 1988 , Page(s): D4/1 - D4/4
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    Present-day distribution transformer technology is reviewed and the characteristics of an ideal transformer are outlined. Design and fabrication procedures for an efficient distribution transformer are discussed and applied to a commercially available transformer View full abstract»

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  • A novice's guide to micro Monte Carlo [load forecasting]

    Publication Year: 1988 , Page(s): B5/1 - B5/7
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    The use of Monte Carlo methods to develop probability distributions of electric load forecasts is described. The methods can be used with either end-use or econometric forecasts and can be implemented on a microcomputer using LOTUS 1-2-3. The concept, forecasting model construction, probability distribution selection, random number generation, and evaluation of the forecast distribution are discussed View full abstract»

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  • Design considerations of medium voltage primary URD cables

    Publication Year: 1988 , Page(s): D2/1 - D2/5
    Cited by:  Papers (1)
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    The short service life of underground residential distribution (URD) cables has led to the development and evaluation of new insulators and cable designs. Some basic comparisons are made between the ethylene-propylene rubber (EPR) and cross-linked polyethylene (XLPE) families of primary cable insulation. Current insulation systems are briefly described, treeing and water-tree testing are discussed, and the performance of EPR and XLPE insulation is indicated. New design features, and their performance, are described. These features are: (1) improved insulation materials; (2) the use of 133% insulation levels in place of 100%; (3) jacketed constructions; (4) cable-in-conduit systems; (5) filled conductor strand; and (6) moisture barrier or moisture-blocked constructions View full abstract»

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  • Monitoring and investigating power disturbance problems

    Publication Year: 1988 , Page(s): B1/1 - B1/6
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    The four main power disturbance situations that can have adverse affects on electronic equipment (voltage fluctuation, transients, noise and power outages) are discussed, and possible methods for reducing these problems are outlined. The solutions include use of power enhancement systems and power synthesis devices. In addition, a number of low-cost measures to address these problems are given View full abstract»

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  • Trends in underground residential distribution cable systems

    Publication Year: 1988 , Page(s): D1/1 - D1/5
    Cited by:  Papers (1)
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    Some observed trends in underground residential distribution cable designs being installed are discussed. Three major changes needed in cable design to improve service reliability are explored: (1) different insulation materials; (2) greater insulation thickness; and (3) use of a jacketed cable. Another change in design which is gaining in popularity, the use of solid or filled strand conductor, is also discussed. Cable accessory performance is reviewed, and standards for terminations and separable connectors are examined. Accessory application issues for various cable designs are discussed View full abstract»

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  • An expert system applied to power system operation

    Publication Year: 1988 , Page(s): B4/1 - B4/4
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    The development and features of an expert system package to assist the supervisor in the control center at a distribution or transmission level is described along with criteria for its application. This microcomputer package is intended for use in a power system configuration with distributed control centers. The expert system analyzes the electrical system's voltage and power flow parameters and helps the operator to organize strategies and plans of actions when the parameters fall outside of specified limits. With a simulator, the package can also be used for training personnel View full abstract»

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  • Impact of rural design, operating and restoration practices on the costs of service interruptions

    Publication Year: 1988 , Page(s): C6/1 - C6/9
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    Two common isolation-restoration procedures are evaluated in some detail to demonstrate that the isolation-restoration procedures adopted by a power utility depend on many variables and are usually unique to each utility's distribution circuit configuration. Generalized conclusions may be in error without a detailed analysis of the isolation-restoration practices proposed. A zone branch methodology based on outage activity flow graphs is used to estimate the reliability levels of customers being served from different line sections of a sectionalized distribution trunk line. The results demonstrate that a customer's reliability level depend on his location within a distribution circuit configuration and the type of isolation-restoration procedure adopted by a utility. A case study is presented to illustrate the impact of various isolation-restoration procedures on the cost of interruptions to a single rural customer View full abstract»

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  • A field investigation of the effects of neutral separation and supplemental grounding on primary neutral-to-earth voltage levels

    Publication Year: 1988 , Page(s): A3/1 - A3/8
    Cited by:  Papers (1)
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    The authors present the results of a field investigation undertaken to examine how primary neutral-to-earth voltage levels on a rural distribution feeder are affected by the degree of primary neutral grounding and/or primary/secondary neutral separation. Separation of primary and secondary neutral/ground systems has been identified as one method for reducing potential off-farm voltage sources in studies of stray voltage problems at diary farms. The results of this study have shown that the present preferred method of solidly bonding primary and secondary neutrals is consistent with the goal of minimizing the primary neutral-to-earth voltage on rural feeders. The large amounts of supplemental primary neutral grounding provided for in this investigation, could not reduce the primary neutral-to-earth voltage to zero while the neutral was performing its intended function of serving the distribution load View full abstract»

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  • Computed design and measured electrical loads on farms

    Publication Year: 1988 , Page(s): B3/1 - B3/5
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    Sections 220-40 and 220-41 of the National Electrical Code (NEC) deal with electrical design criteria for the computation of farm loads. Those sections are based on the American Society of Agricultural Engineers (ASAE) Engineering practice EP294.1 entitled, ```Computing Electrical Demands for Farms'. Peak electric demand data and equipment surveys of over 280 farms in Kansas and Nebraska were collected between 1980 and 1985. Design loads computed by the method specified in Article 220 of the NEC and actual measured loads revealed that the latter were generally less than the former. However, a few measured loads actually exceeded the computed design load View full abstract»

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  • Effects of voltage levels and transients at the point of utilization

    Publication Year: 1988 , Page(s): B2/1 - B2/7
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    Voltage-sensitive electronic equipment (such as personal computers, stereos, VCRs, and satellite dishes) is becoming increasingly common on utility systems. In addition, standard equipment such as dishwashers, washing machines, refrigerators, and the like are using microelectrics for control purposes. As a result, consumers are becoming more sensitive to power quality and utilities are faced with answering consumer complaints. Some voltage levels which should be maintained as well as the types of voltage transients a consumer might experience are given. A troubleshooting guide is also presented View full abstract»

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