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Industrial and Commercial Power Systems Technical Conference, 1992. Conference Record, Papers Presented at the 1992 Annual Meeting., IEEE Conference Record of the

Date 4-7 May 1992

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Displaying Results 1 - 15 of 15
  • 1992 IEEE Conference Record of the Industrial and Commercial Power Systems Technical Conference (Cat. No.92CH3174-0)

    Publication Year: 1992
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    Freely Available from IEEE
  • Coordination of low voltage circuit breakers-chapter 6 of P1015-Blue Book

    Publication Year: 1992 , Page(s): 1 - 9
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    IEEE project P1015, Application Guide for Low Voltage Circuit Breakers, the Blue Book, deals the proper selection and application of low-voltage power and molded case circuit breakers. Chapter six deals with factors to consider in coordinating these circuit breakers with other protective devices View full abstract»

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  • Efficiency of dual-winding induction motors with integral capacitors

    Publication Year: 1992 , Page(s): 65 - 70
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    A steady-state circuit model, based on that of a three-winding transformer, is used to represent the motor configuration designed by G.D. Roberts (1989). The model was found to predict the motor performance with remarkable accuracy. Optimal capacitor values that maximize the efficiency of both the Roberts motor and that proposed by C.L. Wanlass (1980) were determined for various load conditions. It was found that the Roberts motor under test is less efficient than the standard induction motor even when using optimal capacitor sizes at each load point. However, simulation results indicated that the Wanlass motor is slightly more efficient under heavy loads but less efficient under light loads, when compared to the conventional motor View full abstract»

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  • The effect of corrosion myths on national electrical standards

    Publication Year: 1992 , Page(s): 39 - 43
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    It is argued that stainless steel does corrode and should not be listed as an acceptable grounding material without caveats. A review of corrosion basics along with a detailed account of how stainless steel does corrode is provided. Examples of other misconceptions on the part of electrical engineers, as well as corrosion engineers, are also discussed. This discussion underlies the need for a strong liaison between the IEEE and the National Association of Corrosion Engineers (NACE) View full abstract»

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  • The designer of industrial and commercial power systems and code interpretations

    Publication Year: 1992 , Page(s): 50 - 56
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    The analysis is developed from the viewpoint of the electrical engineer and designer of industrial and commercial power systems. It assesses the problems of what is seen to be interpretations of the National Electrical Code which deviate from established general good practice. The problems of interpretations by the inspection authority which are not in the realm of mainstream practice are addressed. Recommendations are made for handling code violations which may be charged to design staff. Some suggestions are made on how the IEEE Industry Applications Society might assist design engineers in working with the Code View full abstract»

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  • Superconducting magnetic energy storage for power systems application

    Publication Year: 1992 , Page(s): 28 - 34
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    A survey of the technology for superconducting magnetic energy storage (SMES) is discussed. This technology is attractive in terms of its high efficiency and fast response, but the economic benefits are dubious. Research in the USA and Japan resulted in several conceptual designs for utility-scale SMES systems. Experiments on power system models proved that SMES systems offer other benefits in addition to energy storage. Economic evaluations showed that the SMES is competitive with pumped hydro, especially when the energy price increases. A power flow program was used to verify the application of a SMES plant to the Taiwan power system View full abstract»

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  • Protecting load devices from the effects of low-side surges

    Publication Year: 1992 , Page(s): 15 - 22
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    Wherever lightning and poor utility power system grounds exist, distribution secondary systems are subjected to high-voltage surges due to lightning current seeking ground through low-voltage circuits. The authors describe this low-side surge phenomenon, and the importance of protecting the service entrance and critical load devices properly, especially when secondary arresters are applied on distribution transformers. This practice can increase the voltage stress at the customer service entrance. If any ground paths exist on the customer side of the service entrance, these surges can penetrate further into the customer's system. Damage caused by low-side surges can be avoided if properly coordinated arresters are installed at the transformer secondary, service entrance, and at load devices. A properly coordinated and effective MOV protection scheme is described and recommended View full abstract»

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  • Industrial substations: plant-utility interface considerations

    Publication Year: 1992 , Page(s): 35 - 38
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    A chapter has been written for the next update of the Red Book, ANSI/IEEE Standard 141. The authors provide an abbreviated version of the chapter. This chapter provides a discussion of a plant's interface considerations with its utility company for the planning, design, construction, and operation of industrial-type substations most commonly supplied by 15-230 kV class utility systems View full abstract»

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  • Effecting changes in the National Electrical Code

    Publication Year: 1992 , Page(s): 44 - 46
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    The procedures for processing changes to the National Electrical Code (NEC) are addressed. The NEC governs all electrical installations in industrial facilities as well as commercial and residential occupancies. Since new products and electrical technology are constantly evolving, it is necessary to revise the NEC periodically to incorporate these changes in materials and methods. The complete revision cycle is defined, and guidance for submitting proposals to revise the NEC is provided View full abstract»

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  • Effects of medium voltage capacitor bank switching surges in an industrial distribution system

    Publication Year: 1992 , Page(s): 57 - 64
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (704 KB)  

    Three effects of medium-voltage capacitor bank switching surges in an industrial distribution system are described. The switching duties on the medium-voltage circuit breakers could be exceeded under back-to-back switching conditions of the capacitor banks. The switching surges at the primary distribution voltage level could be transmitted through the transformer windings, and the resulting overvoltages could shut down the secondary connected DC or variable frequency AC drive loads. The capacitors could be stressed due to frequent switching surge overvoltages. It is shown that the effects of capacitor bank switching surges can be minimized and the switching duties on the circuit breakers can be reduced by series reactors in the capacitor banks, switching resistors, surge capacitors, and surge arresters at the primary and secondary voltage levels of the distribution system View full abstract»

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  • Shaft currents in electric machines fed by solid-state drives

    Publication Year: 1992 , Page(s): 71 - 79
    Cited by:  Papers (11)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (508 KB)  

    The author discusses the generation of shaft voltages and currents in electric rotating machinery. Those mechanisms of shaft voltage generation that are susceptible to being intensified by solid-state drives are identified. Harmonic generation by solid-state drives is reviewed and categorized for its severity for the most commonly used types of circuit topologies and commutation techniques. Both elements are integrated to ascertain the resulting additional onerous effects that solid-state switched power supplies have on the bearings of electrical machines. Although shaft voltages and currents exist in both AC and DC machines, the author has limited the discussion to AC drives View full abstract»

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  • Reliability optimization of PLC-integrated high-quality power supply protection systems

    Publication Year: 1992 , Page(s): 10 - 14
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    The authors deal with the analysis of some possibilities related to the adoption of the programmable logic controller (PLC) in a protection system for a medium-voltage electrical installation. A reliability evaluation of the entire protection system as obtained with PLC adoption is performed in order to point out every possible advantage of this promising technical solution. A correct reliability evaluation of PLC integrated solutions must analyze the entire system behavior if there is a PLC failure to indicate improved reliability indices of the whole system. On the basis of numerical evaluations, some design criteria on protection system logic are proposed, which allows achievement of a noticeable improvement of these indices, by means of an appropriate choice of tripping logic between positive and negative View full abstract»

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  • Exploring simplified, reliable, maintainable power systems for Space Station Freedom

    Publication Year: 1992 , Page(s): 87 - 98
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    The author describes a conceptual design study whose principal purpose was to demonstrate that the design, operating, and maintenance philosophies developed in the industrial and commercial power systems environment are far more appropriate to a quasi-permanent, maintainable, multipurpose facility such as the Space Station Freedom than the principles NASA has traditionally applied to one-shot space missions. In the study, a concept for the space station power system which promises essentially the same performance as the NASA-developed baseline design while reducing weight, volume, losses, maintenance, and logistical requirements was developed. It was also shown that the blind application of design ground rules supposedly intended to ensure high reliability and availability can actually have the opposite effect View full abstract»

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  • Substation reliability simulation model

    Publication Year: 1992 , Page(s): 80 - 86
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    Utility supply operational characteristics are used to reveal the possible significant differences between theoretical and actual reliability indices when component failures and restoration activities are not independent. A customized simulation model is described for assessing the reliability indices of an industrial substation configuration as a function of calendar time based on the historical utility supply data and an industrial substation's operation configurations, loading patterns, and restoration activities which are dependent upon the severity of the power interruption. The simulation model was applied to a radial industrial substation configuration. The historical reliability performance of the utility-industrial customer is considered as it relates to the theoretical expectations and changing utility and industrial facility operational characteristics View full abstract»

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  • Fault current calculations template

    Publication Year: 1992 , Page(s): 23 - 27
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    The author introduces a technique for using personal computers in some of the more arduous calculations of electrical power design. He deals with the development of a template, which is a set of preformulated algorithms for use in a spreadsheet program, to provide calculations for fault current estimates. The spreadsheet program handles the mechanics of calculation and data management. Complex values of impedances and other circuit elements can be included in the computation. The template contains algorithms for conversions of data to and from per unit form, complex number calculations for network resolution, and calculations to find fault current, voltage drop, power factor, and other functions View full abstract»

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