# IEEE Transactions on Power Delivery

## Filter Results

Displaying Results 1 - 25 of 78
• ### Computer aided design of synthetic test circuits for high voltage circuit-breakers

Publication Year: 1989, Page(s):1049 - 1055
Cited by:  Papers (6)
| |PDF (455 KB)

The authors describe experience acquired in designing test circuits for high-voltage circuits breakers. Circuit synthesis is achieved numerically, using an iterative method which involves the Laplace transform. Different test circuits are considered that are needed to obtain responses specified by ANSI and IEC standards. The specific interactive software has been created to permit automatic synthe... View full abstract»

• ### Discussion, with reply, of "Test results of personal protective grounding on distribution line wood pole construction" by J.T. Bonner, B. Erga, W.W. Gibbs, and V.M. Gregorius

Publication Year: 1989, Page(s):1127 - 1128
| |PDF (825 KB)

Several comments and criticisms are made concerning the above-named work (ibid., vol.4, no.1, Jan. 1989). In particular, the original authors' claim that the personal protective grounds (single-point ground) method is superior to the working ground and bracket ground methods used for worker protection was questioned.<> View full abstract»

• ### RFI source-locating on power lines-an update

Publication Year: 1989, Page(s):1137 - 1144
Cited by:  Patents (3)
| |PDF (880 KB)

The author describes a practical and efficient means for locating RI (radio interference) and TVI (television interference) sources on power lines, particularly those operating below 70 kV, where most complaints originate. The main emphasis is on locating sparking sources on overhead lines, but the location of RFI sources occurring in underground lines and the location of nonspeaking power line so... View full abstract»

• ### Adaptation of the control equipment to permit 3-terminal operation of the HVDC link between Sardinia, Corsica and mainland Italy

Publication Year: 1989, Page(s):1269 - 1274
Cited by:  Papers (5)
| |PDF (704 KB)

After more than 20 years of service as a conventional two-terminal HVDC link, the Sardinia-mainland Italy HVDC link (200 MW, 200 kV) is now operating as a three-terminal system. The original control equipment has been modified to allow the introduction of a tapping station on the line for three-terminal operation. The adaptations to the control equipment, including means to ensure that the convert... View full abstract»

• ### Performance of large air gaps under lightning overvoltages: experimental study and analysis of accuracy predetermination methods

Publication Year: 1989, Page(s):1379 - 1392
Cited by:  Papers (49)
| |PDF (1064 KB)

The authors summarize the results of research on the performance of large air gaps under impulses simulating lightning overvoltages. Tests were performed on various gap configurations and with several impulse shapes of both polarities. The impulse characteristics were varied to cover most cases of practical interest. Attention was paid to breakdown parameters and to physical aspects associated wit... View full abstract»

• ### Measurement of the electromagnetic environment of HVDC converter stations

Publication Year: 1989, Page(s):1129 - 1136
Cited by:  Papers (13)
| |PDF (660 KB)

The results of an experimental study on the electromagnetic environment of HVDC (high-voltage direct-current) converter stations are presented. Transient EMI (electromagnetic interference) as well as steady-state RI (radio interference) and TVI (television interference) measurements were made at the Arnott station of BC Hydro and the Chateaguay station of Hydro-Quebec. The maximum values of the el... View full abstract»

• ### Transient analysis of extended distribution networks

Publication Year: 1989, Page(s):1290 - 1296
Cited by:  Papers (8)
| |PDF (528 KB)

An analytical method is presented for the analysis of the transient behavior of extended distribution networks during short-circuits or start-up using interactive, graphical techniques. A fast algorithm is used which exploits the radical nature of the network to calculate the nodal voltages. Two models are available for the transient analysis of the induction motors, which can be used according to... View full abstract»

• ### Validated techniques for modeling shell-form EHV transformers

Publication Year: 1989, Page(s):1070 - 1078
Cited by:  Papers (24)
| |PDF (900 KB)

An EHV (extremely high voltage) shelf-form autotransformer has been thoroughly instrumented and tested for frequency response and step response. The results have been used to develop and validate computer models for predicting the transient behavior of transformers at the design stage. The models are based on relatively simple constant-parameter circuit models. The procedures have been applied to ... View full abstract»

• ### Ampacity studies on 49°C-rated transmission line

Publication Year: 1989, Page(s):1476 - 1485
Cited by:  Papers (6)  |  Patents (1)
| |PDF (1504 KB)

It is noted that transmission lines rated at 49°C have little thermal margin when operated in the summer. Results are given of an experimental study on four spans of an idle 115 kV three-phase transmission line. Under conditions of 33°C ambient, 2 to 4 km/hr effective wind speed, high solar input and 260 A load current, the 477 kcmil conductor temperature reached 47°C. The ampacity mod... View full abstract»

• ### Instrumentation system used to determine the effects of steep front short duration impulses on electric power system insulation

Publication Year: 1989, Page(s):938 - 941
Cited by:  Papers (2)
| |PDF (380 KB)

The author describes instrumentation which is capable of recording steep-front short-duration or EMP (electromagnetic pulse) transients. The instrumentation includes a digitizer that samples the voltage (digitizes) at 742 ps per sample and has a 10 K work (sample) memory depth. A second digitizer is capable of nanoseconds per sample, and 32 K words of memory. The instrumentation system used in a s... View full abstract»

• ### Transient analysis of heat dissipation due to a HVDC ground electrode

Publication Year: 1989, Page(s):916 - 920
Cited by:  Papers (8)
| |PDF (240 KB)

The temperature of the soil surrounding a high-voltage direct-current (HVDC) ground electrode was computed at various points in time using finite difference methods. The temperature response for various ground electrodes was computed using these same techniques. The results were then compared with results obtained experimentally in a laboratory. It is suggested that peak temperature calculations m... View full abstract»

• ### Treatment effects and strength grading for CCA-treated red pine poles

Publication Year: 1989, Page(s):1262 - 1268
| |PDF (676 KB)

Destructive and nondestructive (NDE) tests were performed on 25 untreated and 75 chromated copper arsenate (CCA) treated red pipe poles to determine basic strength properties and the effects of treatment and strain rate. Test results are compared to previously reported data and to the ANSI 05.1 fiber stress rating and show that the ANSI stress rating continues to be adequate for its intended purpo... View full abstract»

• ### EHV series capacitor banks: a new approach to platform to grounds signalling, relay protection and supervision

Publication Year: 1989, Page(s):1369 - 1378
Cited by:  Papers (5)  |  Patents (6)
| |PDF (1200 KB)

A method for platform-to-ground signaling, relay protection, and supervision of EHV (extremely high voltage) series capacitor banks is presented. The system comprises optical current transducers, optical fiber system, interface unit, and microprocessor-based protection supervision and control equipment located in the control room. The optical current transducer, located at high potential, does not... View full abstract»

• ### HVDC models used in stability studies

Publication Year: 1989, Page(s):1153 - 1163
Cited by:  Papers (16)
| |PDF (940 KB)

The author discusses the new generation of detailed models for HVDC systems that were recently introduced in power system stability programs. These models represent the high-speed dynamics of the converter controllers as well as the L/R dynamics of the DC transmission. Older DC models based on pseudo-steady-state relationships are still in general use. The author addresses the following questions ... View full abstract»

• ### Loss minimization of distribution feeders: optimality and algorithms

Publication Year: 1989, Page(s):1281 - 1289
Cited by:  Papers (107)
| |PDF (800 KB)

Determining open switch positions for the minimum-loss configuration of a radial distribution system is a discrete optimization problem. The authors present a global optimality condition of the problem and two algorithms: one is based on the uniformly distributed load model and the other on the concentrated current (or power) demand model. The derivation of the optimality condition relies on a con... View full abstract»

• ### Network reconfiguration in distribution systems for loss reduction and load balancing

Publication Year: 1989, Page(s):1401 - 1407
Cited by:  Papers (1320)  |  Patents (3)
| |PDF (728 KB)

A general formulation of the feeder reconfiguration problem for loss reduction and load balancing is given, and a novel solution method is presented. The solution uses a search over different radial configurations created by considering switchings of the branch exchange type. To guide the search, two different power flow approximation methods with varying degrees of accuracy have been developed an... View full abstract»

• ### Electrical environment of the uprated Pacific NW/SW HVDC Intertie

Publication Year: 1989, Page(s):1305 - 1317
Cited by:  Papers (17)
| |PDF (1164 KB)

The authors summarize the results of a research effort to characterize the electrical environment of the Pacific NW/SW HVDC (northwest/southwest high voltage direct current) Intertie. Forty channels of data were collected simultaneously at 10 test locations, including electric field, ion current density, unipolar ion density, net space charge density, audible noise, radio noise, and important weat... View full abstract»

• ### An experimental study of ionizing air terminal performance

Publication Year: 1989, Page(s):1175 - 1184
Cited by:  Papers (8)
| |PDF (1064 KB)

An experimental study of the performance of ionizing air terminals versus nonionizing air terminals is reported. Radioactive sources were used to obtain ionization of the air surrounding the tip of the air terminals. Outdoor tests were made during both rain/fog and clear weather with the natural bias produced by the clouds above the testing area, and also under artificial bias. This arrangement pe... View full abstract»

• ### Availability of corona cage for predicting audible noise generated from HVDC transmission line

Publication Year: 1989, Page(s):1422 - 1431
Cited by:  Papers (28)
| |PDF (772 KB)

The authors examine the feasibility of using a corona cage to predict audible noise (AN) generated from an HVDC (high-voltage direct current) transmission line. The possible use of the cage is based on the assumption that generation quantities of AN and corona current are determined by Fmax (the true' maximum conductor surface gradient in the presence of space charge) regardless of the... View full abstract»

• ### Experimental investigation of the dielectric recovery strength between the separating contacts of vacuum circuit breakers

Publication Year: 1989, Page(s):1063 - 1069
Cited by:  Papers (8)
| |PDF (472 KB)

An experimental investigation has been carried out to examine the dielectric recovery strength of two commercial vacuum circuit breakers rated 15 kV and 7.2 kV, respectively, using the substitute method of Rabus. The two breakers exhibited different characteristics when tested up to 45 kV; continuous repetitive breakdowns occurred with the 7.2 kV device but not with the 15 kV interrupter, reflecti... View full abstract»

• ### Evaluation of the effectiveness of shielding and filtering of HVDC converter stations

Publication Year: 1989, Page(s):1469 - 1475
Cited by:  Papers (5)
| |PDF (504 KB)

The application of the Numerical Electromagnetic Code (NEC) to the problem of EMI (electromagnetic interference) from HVDC (high-voltage direct current) converter stations is investigated, with particular emphasis on evaluating the effectiveness of valve hall shielding and filtering. It is shown that valve hall shielding alone is not effective in reducing the EMI of converter stations. Appropriate... View full abstract»

• ### Performance assessment and control of power system relaying

Publication Year: 1989, Page(s):986 - 994
Cited by:  Papers (11)
| |PDF (796 KB)

The author outlines various reliability assessment and performance monitoring methods for power system protection. Particular reference is made to the approach adopted for protection performance assessment and control in China Light & Power Company Ltd. because of the special operation when needed' nature of protection relaying, a probabilistic approach for reliability assessment is adopted w... View full abstract»

• ### Instrumentation for high-speed digital recording of switching surges

Publication Year: 1989, Page(s):932 - 937
Cited by:  Papers (2)
| |PDF (612 KB)

Three sophisticated monitoring systems were developed and used to make unattended measurements of over 600 switching surges on 33 motors at 11 different utilities. The authors describe in detail one of the recording systems which relies on ECL (emitted coupler logic) digital electronics and high-speed commercial digitizers to measure the multiple, fast-risetime, high-voltage surges typically creat... View full abstract»

• ### The implications of the electrogeometric model regarding effect of height of structure on the median amplitude of collected lightning strokes

Publication Year: 1989, Page(s):1450 - 1460
Cited by:  Papers (54)
| |PDF (880 KB)

M. Sargent (1972) concluded that the median current of the lightning strokes collected by a structure increases when the height of the structure is increased. In the present work, it is shown that Sargent's conclusion is applicable only to the case of equal striking distances, and that Sargent's use of too low a median current to flat ground has inadvertently exaggerated the effect of height on me... View full abstract»

• ### Short-circuit heating of insulated conductors

Publication Year: 1989, Page(s):873 - 877
Cited by:  Papers (1)
| |PDF (340 KB)

The author presents a calculation method, developed from measurements and mathematical-physical methods, for investigating the short-circuit heating of insulated conductors. The proposed approach permits the determination of the temperature at the conductors or of the admissible currents. Starting from common positions of adiabatic and nonadiabatic heating situations, models based on transmission ... View full abstract»

## Aims & Scope

Installation and operation of apparatus, equipment, structures, materials and systems for the safe, reliable and economic generation, transmission, distribution, conversion, measurement and control of electric energy.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Wilsun Xu
Ph.D., P.Eng.
Dept. Electrical and Computer Eng.
University of Alberta
(9107 - 116 Street)