# 1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)

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Displaying Results 1 - 25 of 78
• ### 1999 IEEE Transmission and Distribution Conference [front matter]

Publication Year: 1999, Page(s):0_1 - xvi
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• ### An effective-resistance measurement technique for improving the current-cycling test of power connectors

Publication Year: 1999, Page(s):616 - 622 vol.2
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The current-cycling tests as prescribed by the ANSI C119.4 and CSA-C57 standards have been in use for many years by utilities in the US and Canada to evaluate the performance of electrical connectors. Although these standards can provide some satisfactory level of assurance for the users, their evaluation criteria are, however, not sensitive enough to detect the contact degradation. As a consequen... View full abstract»

• ### Author index

Publication Year: 1999, Page(s):0_4 - 0_6
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• ### New test method for evaluation of corona-caused aging in fiber-optic cables

Publication Year: 1999, Page(s):734 - 738 vol.2
Cited by:  Papers (1)
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Fiber-optic communication cables installed on high voltage transmission line structures are subject to high electric fields, which may cause corona discharge near the grounded cable support. This corona discharge, in the long term, deteriorates the cable jacket, which may result in puncture and failure. This paper proposes a new test method to evaluate the corona resistance of fiber-optic cable ja... View full abstract»

• ### Effects of electrical soil properties on electric fields around EHV transmission lines

Publication Year: 1999, Page(s):730 - 733 vol.2
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This paper discusses the effect of the electrical properties of soil, permittivity and conductivity, on the electric field values around EHV transmission lines. Also, this paper studies the effect of soil thickness on the field values. The assessment of such electric fields is based on the charge simulation technique with complex fictitious charges. A simultaneous combinations of finite realistic ... View full abstract»

• ### A new lossless circuit balancing the MV distribution systems from insulated shield wires of HV lines

Publication Year: 1999, Page(s):722 - 728 vol.2
Cited by:  Papers (1)
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Three-phase scheme shield wire lines (MV lines obtained by isolating 2 shield wires of an HV transmission line) are intrinsically unbalanced. Even though the load supplied is balanced, negative sequence components of the voltage are originated by this asymmetry. Balancing means are necessary in order to contain these components to tolerable values. The paper presents a new balancing circuit, made ... View full abstract»

• ### Monitoring changes in system variables due to islanding condition and those due to disturbances at the utilities' network

Publication Year: 1999, Page(s):460 - 465 vol.2
Cited by:  Papers (4)  |  Patents (1)
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The continuous growth in embedded generation (EG) has emphasised the importance of being able to reliably detect loss of mains (LOM) especially when the EG is islanded' with part of the utility network. Current methods of detection have not proved completely dependable, particularly when the islanded' load's capacity matches that of the EG. This paper is the result of an investigation, using the... View full abstract»

• ### An alternative procedure for the design of high voltage overhead transmission lines: sensitivity analysis, constrained design and line upgrading through tower reconductoring

Publication Year: 1999, Page(s):715 - 721 vol.2
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In a previous publication by the author (1999), a method was suggested for the proper selection of the number and radius of the line's subconductors, the bundle configuration as well as the main tower dimensions of HV and EHV lines. The objectives of this follow-up paper are: (1) the application of the above procedure to study the sensitivity of the line's transmitted power to changes in its condu... View full abstract»

• ### A new method to calculate power distribution losses in an environment of high unregistered loads

Publication Year: 1999, Page(s):609 - 614 vol.2
Cited by:  Papers (11)
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The paper presents a new method to break down, by subsystem and cause, power distribution losses in electrical systems where the share of nontechnical losses is important. In this type of system the traditional method has given rise to inaccuracies due to high unregistered load. The new method is based on the nature of the losses: resistive losses obtained from the squared ratio between hourly dem... View full abstract»

• ### Universal protection and control applied to a 3-breaker transfer scheme

Publication Year: 1999, Page(s):454 - 459 vol.2
Cited by:  Patents (1)
| | PDF (536 KB)

A new modular hardware and software based protection and control system has been developed to be more flexible and economical than conventional relay platforms for the development of custom protection and control schemes. The system includes a computer aided engineering (CAE) package to permits rapid customization of the scheme's logic and protective elements. An embedded virtual test system allow... View full abstract»

• ### Development of high current draw lead transformer bushings designed in accordance with IEEE standards

Publication Year: 1999, Page(s):866 - 870 vol.2
Cited by:  Papers (1)
| | PDF (352 KB)

Historically draw lead bushings, designed in accordance with IEEE Standards were limited in current carrying capacity to a maximum of 400 amperes through 69 kV and 800 amperes 115 kV and above. For most medium power transformers, the high voltage bushings were applied with draw lead conductors. However, the low voltage side of these transformers almost always required bottom-connected bushings. Th... View full abstract»

• ### An alternative procedure for the design of high voltage overhead transmission lines

Publication Year: 1999, Page(s):708 - 714 vol.2
Cited by:  Papers (1)
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An alternative procedure for the design of HV and EHV overhead transmission lines is presented. It is based on the simultaneous full utilization of the conductors' current carrying capacity, the electric insulating capability of air as well as the satisfaction of the line's steady state stability condition. The line, of a given length, is assumed to operate without any series or shunt compensation... View full abstract»

• ### Feeder loss reduction by switching operations with a hybrid programming technique

Publication Year: 1999, Page(s):603 - 608 vol.2
Cited by:  Papers (4)
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This paper presents a hybrid programming (HP) technique to reduce distribution feeder losses. The problem is optimized in a stochastic searching manner similar to that of evolutionary programming (EP). The initial population is determined by opening the switches with the lowest current in every mesh derived in the optimal power flow (OPF) with all switches closed. Solutions provided by OPF are the... View full abstract»

• ### Polymer concrete catenary insulation for mass transit electric traction

Publication Year: 1999, Page(s):670 - 674 vol.2
Cited by:  Papers (1)
| | PDF (344 KB)

This paper describes a complete insulating arrangement for electric traction aerial contact line, commonly named catenary, employing only polymer concrete (PC) insulators. The electromechanical components were conceived and manufactured taking into account the existing 3000 V DC electric traction catenary keeping in mind the use of standardized components or using standard insulators normally prod... View full abstract»

• ### Economical optimization of conductor selection in planning radial distribution networks

Publication Year: 1999, Page(s):858 - 863 vol.2
Cited by:  Papers (2)
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A new computer algorithm and program is presented for selection of optimal conductor type and size for each feeder segment. An acceptable voltage profile is maintained along the entire feeder of the network while obtaining an objective of minimizing the total cost, which consists of capital investment and cost of feeder losses, etc. Node numbering scheme and node connection sequence selection have... View full abstract»

• ### Signature analysis for leakage current waveforms of polluted insulators

Publication Year: 1999, Page(s):806 - 811 vol.2
Cited by:  Papers (6)
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Previous researchers have shown, using FFT spectrum analyzers, that arcing causes a significant increase in the third harmonic content of the leakage current of polluted insulators. This paper investigates the feasibility of using modern high resolution digital spectral analysis methods to obtain better spectral estimates. Techniques discussed include the classical periodogram, correlogram, autore... View full abstract»

• ### A thermal model for optimized distribution and small power transformer design

Publication Year: 1999, Page(s):925 - 929 vol.2
Cited by:  Papers (5)
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A thermal model for the design of rectangular layer windings for transformers is summarized. The model calculates thermal gradients across layers, to and from the core, and from the no-duct region under the core iron to the ducted region. The model evaluates the effects of cooling duct quantity, location, and size on the thermal performance. The model includes temperature dependent fluid propertie... View full abstract»

• ### Evaluation of the failure probability for gapless metal oxide arresters

Publication Year: 1999, Page(s):700 - 705 vol.2
Cited by:  Papers (1)
| | PDF (392 KB)

The energy absorption of surge arresters on power systems due to lightning strokes is evaluated using the Electromagnetic Transients Program (EMTP). On the basis of this study, a selection criteria is given in order to determinate the optimal arrester for a location. The improvement is applied to a practical example. The analysis shows that the failure probability of an arrester depends on its ene... View full abstract»

• ### An effective algorithm for distribution feeder loss reduction by switching operations

Publication Year: 1999, Page(s):597 - 602 vol.2
Cited by:  Papers (3)
| | PDF (388 KB)

This paper presents an effective heuristic-based switching scheme to solve the distribution feeder loss reduction problem in fuzzy notations. By using the proposed algorithm, an efficient network configuration can be obtained to reduce loss. According to the switch searching strategies, some membership functions were defined in this paper. Through the “set” operations of all the member... View full abstract»

• ### Fault location technique for six phase transmission lines with unsynchronized phasors

Publication Year: 1999, Page(s):663 - 667 vol.2
Cited by:  Papers (2)  |  Patents (1)
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Six-phase lines utilize right-of-way more efficiently than double circuit three-phase lines, and may be used to meet increasing power transmission demand. However, accurate relaying and fault location algorithms must be developed for six-phase lines. Since six-phase lines are not ideally transposed in the same manner as conventional three-phase lines, fault location using traditional symmetric com... View full abstract»

• ### Composite insulators are gaining ground-25 years of Swiss experience

Publication Year: 1999, Page(s):827 - 833 vol.2
Cited by:  Papers (7)
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This paper presents the newest applications of silicone composite insulators which are finding increasing use not only in Switzerland, but also in the power industry worldwide. These applications include interesting designs for railway overhead lines, medium voltage lines, and 400 kV high voltage overhead transmission lines. Solutions are presented for high-voltage outdoor equipment, which have be... View full abstract»

• ### ACSS/TW-an improved conductor for upgrading existing lines or new construction

Publication Year: 1999, Page(s):852 - 857 vol.2
Cited by:  Papers (7)
| | PDF (496 KB)

This paper describes the properties and performance characteristics of an improved overhead conductor, ACSS/TW. ACSS/TW is constructed of fully annealed aluminum wires formed into a trapezoidal shape. The aluminum wires are stranded around a steel core of seven or more wires as described in ASTM B-857. The improved conductor can operate continuously at temperatures up to 250°C without loss of ... View full abstract»

• ### Transmission line models used in travelling wave studies

Publication Year: 1999, Page(s):797 - 803 vol.2
Cited by:  Papers (4)
| | PDF (428 KB)

In this paper, for solving the problem of simulating the travelling wave phenomena, a method used for determining the number of equivalent Π sections of the transmission line model in accordance with the travelling wave frequency range of interest and the model accuracy required is proposed. By analyzing the fault transients of the multiple Π models and comparing them with those of the distr... View full abstract»

• ### Accurate hot spot modeling in a power transformer leading to improved design and performance

Publication Year: 1999, Page(s):920 - 924 vol.2
Cited by:  Papers (13)
| | PDF (460 KB)

Power transformers are key components in the distribution of electrical energy, so it is very important to protect them from a breakdown. Hot spot temperature is an important parameter in aging of a transformer so it's both for customers and producers of transformers very useful to have an accurate measurement or computer model prediction of the hot spot temperature. This paper describes a compute... View full abstract»

• ### Resonance in inhomogeneous transmission lines using travelling waves

Publication Year: 1999, Page(s):778 - 783 vol.2
| | PDF (528 KB)

The paper presents an analytical procedure for estimation of resonance frequencies in inhomogeneous transmission lines. The procedure is based on a new approach which is based on the fact that the phenomenon is characterized by an algebraic sum of travelling current waves at the beginning of the line. Two typical cases of discontinuities on a practical transmission line are considered: a transpose... View full abstract»