Issue 3 • July-1999
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Insulation coordination of MV power cables
Publication Year: 1999,Page(s):675 - 678
Cited by: Papers (2)
In medium voltage power cables, the concept of cost/reliability has been current since the end of the 1980s when the Brazilian Standards introduced ethylene-propylene-rubber (EPR) insulated cables, with different thicknesses of insulation for conventional cables and for those with blocked conductors or with water tightness constructions. However, despite the benefits obtainable by use of such cabl...Show More
Field monitoring of parameters and testing of EP and TR-XLPE distribution cables
Publication Year: 1999,Page(s):679 - 684
Cited by: Papers (8)
Five commercial ethylene-propylene rubber (EP) and one tree-retardant cross-linked polyethylene (TR-XLPE) 15 kV cables are being aged in the laboratory, and in field service on a utility distribution system. The cables were obtained from six different manufacturers. This study subjects commercially available, widely used EP cables, and one TR-XLPE cable to similar conditions at three different sit...Show More
Five 69 kV XLPE cables, 6 to 23 years in service and two old vintage cables from storage plus a 115 kV XLPE cable from service together with a spare cable from the same production, kept in storage, were evaluated. All components of the cables were found to show little signs of deterioration except for AC breakdown. The 69 kV XLPE cable from service has breakdown levels ranging from 10.2 to 18.2 kV...Show More
Evaluation of jacket materials and configurations and effect of moisture absorbing materials on preventing water tree growth in power cables
Publication Year: 1999,Page(s):690 - 698
Polymer insulated medium voltage cables have experienced premature failures in-service, due in large part to water treeing. Research has shown that the initiation sites of these water trees are often located where there are stress enhancements at the insulation/semiconducting shield interface and where water soluble contaminants permeate into the insulation. Material suppliers, cable manufacturers...Show More
Investigation of the dependence of DC insulation resistivity of ultra-clean polyethylene on temperature and electric field
Publication Year: 1999,Page(s):699 - 704
Cited by: Papers (20)
The present work aims at determining the dependence of the DC insulation resistivity on temperature and electric field for a super-clean low density polyethylene (LDPE) used in manufacturing modern high voltage AC cables. Resistivity measurements were made using relatively thick (/spl sim/2 mm) samples at different temperatures and DC electric fields. Based on the present experimental data, a math...Show More
Temperature dependence of return voltage characteristics
Publication Year: 1999,Page(s):705 - 708
Cited by: Papers (12)
The return voltage measurements have been proposed for the diagnostics on the high voltage equipment characterising the dielectric properties of insulation systems. The application of return voltage method at the diagnostics of the HV current transformers are presented in this paper. The return voltage characteristics such as maximum of return voltage, the initial slope of return voltage and the t...Show More
Cable crossings-derating considerations. I. Derivation of derating equations
Publication Year: 1999,Page(s):709 - 714
Cited by: Papers (15)
Dangerously high interference temperatures can occur at points where cables cross external heat sources even when the crossing occurs at 90/spl deg/. For perpendicular and oblique crossings, these interference temperatures are usually ignored for distribution circuits, whereas for transmission cables, corrective actions in physical installation condition are sometimes taken. Analytical solutions a...Show More
Cable crossings-derating considerations. I. Derivation of derating equations
Year: 1999 | Volume: 14 | Issue: 3
Cable crossings-derating considerations. II. Example of derivation of derating curves
Publication Year: 1999,Page(s):715 - 720
Cited by: Papers (12)
For pt.I see ibid., vol.14, no.3, p.705-14 (1999). Cables crossing other heat sources either perpendicularly or at oblique angles will experience a rise in conductor temperature which should result in ampacity derating. In the first part of the paper a mathematical model for calculation of derating factors was presented. In this paper, a practical numerical example is considered with a 138 kV pipe...Show More
Probability techniques application for economic operation of power cables
Publication Year: 1999,Page(s):721 - 728
Cited by: Papers (1)
High costs and shortages of many raw materials have necessitated renewed analysis of utilization of many engineering material and products. Also, substantial increases in costs to manufacture high quality engineering products have motivated the engineering community to seek more sophisticated techniques to analyze problems. These techniques are designed to render solutions which account for a vari...Show More
Probability techniques application for economic operation of power cables
Year: 1999 | Volume: 14 | Issue: 3
Calculation of the internal thermal resistance and ampacity of 3-core screened cables with fillers
Publication Year: 1999,Page(s):729 - 734
Cited by: Papers (22)
All 3-core cables require fillers to fill the space between insulated cores and the belt insulation or a sheath. The equations given in IEC 287 and in the Neher-McGrath paper (1957) for the internal thermal resistance of 3-core cables were developed for paper insulated cables. For such cables, it was assumed that the insulation and filler materials have the same thermal resistivities. In reality, ...Show More
Experimental validation of a thermal model for the ampacity derating of electric cables in wrapped trays
Publication Year: 1999,Page(s):735 - 742
Cited by: Papers (6)
As a safety measure for certain applications in nuclear power stations, cable trays must be wrapped with a fireproof material. In this paper a new implementation of a thermal model is presented, suitable for the determination of the ampacity derating of electric cables in wrapped trays. Model simulation predictions have been compared with field tests to validate the model. Better agreement between...Show More
Analysis of LN/sub 2/ cooling system and electrical insulation contraction for high Tc superconducting cables
Publication Year: 1999,Page(s):743 - 749
The LN/sub 2/ cooling system for fully flexible three phase high Tc superconducting cables was addressed in this paper. Explicit formulas were presented to calculate the cooling capacity and stability. Thereafter, the stress cracking and the thermal contraction of electrical insulation at low temperature were analyzed theoretically and experimentally. The thermal contractions of the ultra-high mol...Show More
Dielectric breakdown strength correlation with time-to-failure during wet aging of XLPE-insulated cables
Publication Year: 1999,Page(s):750 - 755
Cited by: Papers (7)
This paper reviews two sets of failure information, the GMTF (a parameter obtained from time-to-failure results) and GMBD stress (a parameter that is calculated from AC breakdown test results), and suggests a correlation. The test results were obtained from accelerated aging experiments on full-sized medium voltage cables in carefully controlled and monitored water-filled tanks. Results show that ...Show More
A simple method for the characterization of I-V transducers
Publication Year: 1999,Page(s):756 - 760
Cited by: Papers (2)
The paper presents a simple method for the characterization of the current-to-voltage (I-V) transducers that are based on current transformers. It is performed by reducing to a minimum the unbalance voltage that arises when the transducer output is compared with the voltage drop caused by the transducer input current across a precision noninductive shunt. Experimental data relevant to different ty...Show More
Frequency estimation of distorted power system signals using extended complex Kalman filter
Publication Year: 1999,Page(s):761 - 766
Cited by: Papers (223)
The paper proposes an extended complex Kalman filter and employs it for the estimation of power system frequency in the presence of random noise and distortions. From the discrete values of the 3-phase voltage signals of a power system, a complex voltage vector is formed using the well known /spl alpha//spl beta/-transform. A nonlinear state space formulation is then obtained for this complex sign...Show More
Apparent power definitions for three-phase systems
Publication Year: 1999,Page(s):767 - 772
Cited by: Papers (93)
It is shown that currently used apparent power definitions, namely the arithmetic VA, S/sub A/ and the vector VA, S/sub V/, both lack an important property: the system power losses are not a linear function of the apparent power squared, S/sub A//sup 2/ or S/sub V//sup 2/. The only apparent power definition known today, that holds this property for all the possible situations-balanced, unbalanced,...Show More
Real time digital power system simulator design considerations and relay performance evaluation
Publication Year: 1999,Page(s):773 - 781
Cited by: Papers (27)
Environmental pressures, right of way problems for new transmission lines, large scale system interconnection and increasing power demand especially in developing countries call for new transmission technologies. Use of FACTS and HVDC is gaining momentum. Relaying problems in such systems require a sophisticated approach and numerical technology using high grade processors offers a promising solut...Show More
Implementation and laboratory test results of an Elman network-based transmission line directional relay
Publication Year: 1999,Page(s):782 - 788
Cited by: Papers (23)
A transmission line fault direction identification module based on an Elman recurrent network has been implemented on a DSP board and its behavior is investigated on a physical power system model. Details of implementation and the experimental studies are given and analysed in the paper. Studies show that the proposed approach is able to identify the direction of a fault on a transmission line rap...Show More
A new accurate fault locating algorithm for series compensated lines
Publication Year: 1999,Page(s):789 - 797
This paper presents a new, accurate and robust fault locating algorithm for series compensated lines. The algorithm is developed as a one-end fundamental frequency based technique and offsets both the series compensation effect and the reactance effect resulting from the remote end in-feed. The method uses phase coordinates (abc) instead of symmetrical components [012]. The basic algorithm is pres...Show More
A power transformer protection technique with stability during current transformer saturation and ratio-mismatch conditions
Publication Year: 1999,Page(s):798 - 804
Cited by: Papers (28)
This paper describes a digital technique for protecting power transformers. The technique uses positive- and negative-sequence models of the power system in a fault-detection algorithm. While phase voltages and currents at the transformer terminals are used to detect a fault, no information concerning parameters of the transformer and power system is required. The performance of the proposed techn...Show More
Islanding and load shedding schemes for captive power plants
Publication Year: 1999,Page(s):805 - 809
This paper outlines the various schemes adopted for islanding in industrial plants with captive generation in India. Considerations in the design of islanding and load shedding schemes and reliability aspects are described. Major benefits by interfacing with SCADA are briefly given.Show More
Energy variance criterion and threshold tuning scheme for high impedance fault detection
Keng-Yu Lien;Shi-Lin Chen;Ching-Jung Liao;Tzong-Yih Guo;Tsair-Ming Lin;Jer-Sheng Shen
Publication Year: 1999,Page(s):810 - 817
This paper presents a new approach to the detection of high impedance fault (HIF). The proposed approach (or detector which implements this approach) has four distinct features. First, the detector input signal is the three-phase unbalanced current (or feeder 3I/sub 0/), rather than the conventional three individual phase-currents. Secondly, the detector is designed by monitoring the energy varian...Show More
Design and field testing of a source based protection relay for wind farms
Publication Year: 1999,Page(s):818 - 823
Cited by: Papers (11)
The paper describes the design and field testing of a source based relay suitable for the protection of wind farms with fixed-speed induction generators. The relay provides short-circuit protection for the medium voltage (MV) power collection circuit and the MV and low voltage (LV) windings of each generator transformer. The use of the relay allows a reduction in the construction cost of a wind fa...Show More
Design and field testing of a source based protection relay for wind farms
Year: 1999 | Volume: 14 | Issue: 3
ANN-based novel fault detector for generator windings protection
Publication Year: 1999,Page(s):824 - 830
Cited by: Papers (27)
In this paper, an artificial neural network (ANN) based internal fault detector algorithm for generator protection is proposed. The detector uniquely responds to the winding earth and phase faults with remarkably high sensitivity. Discrimination of the fault type is provided via three trained ANNs having a six dimensional input vector. This input vector is obtained from the difference and average ...Show More
Bibliography of relay literature, 1997 IEEE Committee report
T.S. Sidhu;M. Bajpai;J. Burnworth;P. Crossley;A. Darlington;R. Das;W. Marsh;M.S. Sachdev;J.E. Stephens;M. Swanson;S.S. Venkata;P.B. Winston
Publication Year: 1999,Page(s):831 - 850
The latest of a series of classified lists of power system relaying references, begun in 1927, is presented. This bibliography is in continuation to the bibliographies of relay literature which were published previously and are contained in the following volumes of the IEEE Transactions.Show More
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New York University, Department of Electrical and Computer Engineering
Brooklyn
USA
fdeleon@nyu.eduContact Information
Editor-in-Chief
New York University, Department of Electrical and Computer Engineering
Brooklyn
USA
fdeleon@nyu.eduIEEE Account
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