Edgar R. Taylor

Characteristics of Static, Thyristor-Controlled Shunt Compensators for Power Transmission System Applications

The operating and performance characteristics of two basic types of static, thyristor-controlled shunt compensators, one with a fixed capacitor bank and the other with synchronously switchable capacitor banks, are presented with regard to power transmission system applications. The operating principles, and the similarities and differences between the performance of the two schemes are discussed in the areas of steady-state voltage versus VAR characteristic, behavior under small and large system disturbances, harmonic generation, and loss versus output VAR characteristic.

The Prediction and Control of Self-Excited Oscillations Due to Series Capacitors in Power Systems

This paper covers the analysis of the problem of self-excited current oscillations which may occur when synchronous machines are closely coupled to transmission lines which are highly compensated with series capacitors. A mathematical analysis is made. Corrective measures are suggested and the results of confirming tests are discussed. Two typical system configurations which would be likely to produce these self-excited oscillations are used as examples for detailed calculations.

The Apple Grove 750-kV Project- 515-kV Radio Influence and Corona Loss Investigations

This paper gives the results to date of radio influence and corona loss tests performed at a voltage of 775 kV at the extra-high-voltage test project at Apple Grove, W. Va., a joint research project sponsored by the American Electric Power Service Corporation and Westinghouse Electric Corporation with six other participating companies. Effects of line radio-influence terminations and larger centerphase conductors are discussed. Radio influence and corona loss results are given for there test lines utilizing 4-conductor bundles with subconductor diameters of 1.0, 1.196, and 1.382 inches.

A Method for Analysis of Radio Noise on High-Voltage Transmission Lines

A technique is described for approximating the effect of various factors on the radio noise level, due to conductor corona, on EHV transmission lines. The technique is essentially one of comparison. Relations are given in the Appendix for calculating the conductor gradients and results are presented in curve form. The application is intended only for comparison of radio noise generated by conductor corona on ac lines, with conductors ranging only from 0.3 to 1.3 inches radius (1.5 to 3.3 cm) and for the frequency range from about 0.2 to 1.6 MHz. If an existing line has been evaluated statistically the technique can be used to approximate the radio noise level of another line. A relation is also given for obtaining curves of 3-phase voltage to conductor radius for the same radio noise generation. Because of possible conductor surface differences and environmental differences, which cannot be too accurately evaluated, care is necessary in any final estimation of the average radio noise level.

The Apple Grove 750-kV Project- Equipment Design and Instrumentation

The Apple Grove 750-kV project, jointly sponsored by American Electric Power Service Corporation and Westinghouse Electric Corporation, with six other participating companies, was designed to provide data on corona loss and radio influence performance of conductors at a nominal voltage of 750 kV and to determine the technical and economic feasibility of transmitting power at this extra-high-voltage. The project also incorporates facilities for studying conductor configuration, insulator assemblies, spacers, connectors, splices, hardware, and steel structures. Operating experience has been gained on a 750-kV transformer, lightning arresters, coupling capacitors, and line traps, as well as on a typical 500-kV line design. This paper describes equipment design, instrumentation, and special project features, such as the determination of conductor performance on a statistical basis by the use of simultaneous comparison under the same environmental conditions.

Switching Surge Duty on Modern Arresters

This paper presents the results of an Anacom study which investigated the performance of modern lightning arresters during switching surge operation. A description of the variable characteristic arrester model used to simulate the lightning arrester is presented as are the results of the study using the model on a representative 345-kV system. Particular emphasis is placed on the parameters effecting the discharge current, voltages and energy with attention given to the protective characteristic of the arrester.

Overvoltages and Harmonics on EHV Systems

Steady-state overvoltages can occur on EHV transmission systems during various system operating conditions. The voltage waveforms are characterized by a periodic waveform which may be distorted by harmonics if iron saturation of equipment on the lines occurs. This paper discusses the results of digital and transient network analyzer (Anacom) studies which analyzed system parameters with respect to their effect on harmonics in steady-state overvoltages. Special emphasis was focused on the factors influencing harmonic distortion of the steady-state voltages.

Verification Tests of the VEPCO 500-kY System

The results of the first field tests performed to verify the design of the Virginia Electric Power Company 500-kV system are presented. Initial radio influence measurements made on each line section are compared with levels calculated during the design studies. Switching-surge voltages recorded during various normal and abnormal switching conditions are given, and are shown to be well within predicted values. Descriptions are given of the measuring equipment and techniques used for the field tests and for a continual monitoring of the system.