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13 results on '"Cornick A"'

1. A three-phase model for surge distribution studies in electrical machines

Author

Guardado, J.L., Cornick, K.J., Venegas, V., Naredo, J.L., and Melgoza, E.

Subjects
Transients (Electricity) -- Models, Electrical machinery -- Research, Business, Electronics, Electronics and electrical industries
Abstract

This paper describes a computer model for surge distribution studies in the winding of electrical machines. The computer model takes the coil as the basis for the analysis and uses multiconductor transmission line theory to obtain the transference matrix for the winding. Several practical formulations based on machine design characteristics are used for calculating electrical parameters. Flux penetration into the iron core and mutual coupling between coils in different_phase windings are incorporated into the analysis. The model was validated by a comparison of predicted and calculated results in a high voltage motor. Keywords: computer simulation, switching transients, surge distribution, electrical machines, electrical parameters.

Published
1997

3. Calculation of interturn voltages in machine windings during switching transients measured on terminals

Author

Guardado, J.L., Carrillo, V., and Cornick, K.J.

Subjects
Electrical machinery -- Research, Voltage -- Measurement, Electric motors -- Windings, Electric generators -- Windings, Transients (Electricity) -- Measurement, Business, Electronics, Electronics and electrical industries
Abstract

This paper describes a technique for calculating interturn voltages in machine windings during transient conditions. The technique is based on the measurement of switching transients at the machine terminals and computer simulation of the surge travelling through the winding. The machine winding is treated as a multiconductor transmission line and the Discrete Fourier Transform and convolution techniques are used for calculating the switching transient distribution along the winding. Switching transients results obtained on two electrical motors in the Manzanillo II power plant are used in the analysis. Keywords: Switching transients, interturn voltage, computer simulation, field measurements.

Published
1995

4. The effect of coil parameters on the distribution of steep-fronted surges in machine windings

Author

Guardado, J.L. and Cornick, K.J.

Subjects
Electric generators -- Windings, Electric motors -- Windings, Transients (Electricity) -- Analysis, Electric coils -- Evaluation, Electric insulators -- Evaluation, Business, Electronics, Electronics and electrical industries
Abstract

Studies have been made to establish what coil design parameters have an important influence on the amplitude of interturn voltages developed in a machine winding subject to steep-fronted surges. The studies are based on a multiconductor transmission line computer model of a machine winding energised by a simple ramp function. Variation in interturn voltages produced by changes in insulation thickness, insulation permittivity, turn geometry, coil length and number of turns are examined and certain guidelines for avoiding high interturn voltages are evaluated. An application study is included to show how interturn voltages can be significantly reduced by applying these guidelines.

Published
1992

5. Transient Overvoltages in Electrical Motors During Sequential Pole Closure

Author

Guardado, J.L., Venegas, V., Melgoza, E., Cornick, K.J., and Naredo, J.L.

Subjects
Electric motors -- Models, Transients (Dynamics) -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

This paper addresses the problem of transient overvoltages in electrical motors during sequential pole closure in industrial installations. A computer model that includes the circuit breaker, high-voltage cable and electrical motor is proposed. Multiconductor transmission line theory and modal analysis are applied to the components and the piecewise Fourier transform is used to simulate sequential pole closure. The mechanism of sequential pole closure is analyzed including parallel capacitors and series inductors. Critical times for switching transients are calculated. Finally, the effect of several system and machine parameters on transient overvoltages is investigated. Keywords--Overvoltages, simulation, switching transients, electrical machines, sensitivity analysis, dielectric stresses.

Published
1999

6. Transient overvoltages in electrical motors during sequential pole closure

Author

V. Venegas, K.J. Cornick, Jose L. Guardado, E. Melgoza, and Jose Luis Naredo

Subjects
Electric motor, Engineering, business.industry, High-voltage cable, Energy Engineering and Power Technology, Hardware_PERFORMANCEANDRELIABILITY, Inductor, law.invention, Capacitor, law, Overvoltage, Transmission line, Control theory, Hardware_INTEGRATEDCIRCUITS, Electronic engineering, Transient (oscillation), Electrical and Electronic Engineering, business, Circuit breaker
Abstract

This paper addresses the problem of transient overvoltages in electrical motors during sequential pole closure in industrial installations. A computer model that includes the circuit breaker, high-voltage cable and electrical motor is proposed. Multiconductor transmission line theory and modal analysis are applied to the components and the piecewise Fourier transform is used to simulate sequential pole closure. The mechanism of sequential pole closure is analyzed including parallel capacitors and series inductors. Critical times for switching transients are calculated. Finally, the effect of several system and machine parameters on transient overvoltages is investigated.

Published
1999

7. Calculation of machine winding electrical parameters at high frequencies for switching transient studies

Author

K.J. Cornick and Jose L. Guardado

Subjects
Electric machine, Engineering, business.product_category, business.industry, Energy Engineering and Power Technology, High voltage, Mechanics, Magnetic flux, Transmission line, Electromagnetic coil, Electronic engineering, Transient response, Transient (oscillation), Electrical and Electronic Engineering, business, Induction motor
Abstract

This paper describes a multiconductor transmission line approach for calculating the machine winding electrical parameters for switching transient studies. The technique is based upon the solution of the one dimension diffusion equation in the slot of electrical machines. The coil electrical parameters are calculated considering both the magnetic flux in the iron and in the air. Several practical formulations for calculating the winding electrical parameter are proposed which take into account the machine winding design characteristics. The computer models are validated by a comparison of measured and calculated results in two high voltage induction motors.

Published
1996

8. Calculation of interturn voltages in machine windings during switching transients measured on terminals

Author

V. Carrillo, Jose L. Guardado, and K.J. Cornick

Subjects
Electric motor, Engineering, business.industry, Electrical engineering, Energy Engineering and Power Technology, Discrete Fourier transform, Convolution, Transmission line, Electromagnetic coil, Electronic engineering, Transient (oscillation), Electrical and Electronic Engineering, Surge, business, Voltage
Abstract

This paper describes a technique for calculating interturn voltages in machine windings during transient conditions. The technique is based on the measurement of switching transients at the machine terminals and computer simulation of the surge travelling through the winding. The machine winding is treated as a multiconductor transmission line and the discrete Fourier transform and convolution techniques are used for calculating the switching transient distribution along the winding. Switching transients results obtained on two electrical motors in the Manzanillo II power plant are used in the analysis. >

Published
1995

9. The effect of coil parameters on the distribution of steep-fronted surges in machine windings

Author

Jose L. Guardado and K.J. Cornick

Subjects
Permittivity, Engineering, Machine theory, business.industry, Acoustics, Electrical engineering, Energy Engineering and Power Technology, Ramp function, Distribution (mathematics), Electromagnetic coil, Transmission line, Electrical and Electronic Engineering, business, Voltage
Abstract

The authors identify the coil parameters that are of importance, when assessing interturn voltages produced by steep-fronted transients. The studies are based on a multiconductor transmission line computer model of a machine winding energized by a simple ramp function. Variations in interturn voltages produced by changes in insulation thickness, insulation permittivity, turn geometry, coil length and number of turns are examined and certain guidelines for avoiding high interturn voltages are evaluated. An application study is included to show how interturn voltages can be significantly reduced by applying these guidelines. >

Published
1992

12. A computer model for calculating steep-fronted surge distribution in machine windings

Author

Jose L. Guardado and K.J. Cornick

Subjects
Electric machine, Engineering, business.product_category, business.industry, Modal analysis, Energy Engineering and Power Technology, Capacitance, Inductance, Electromagnetic coil, Transmission line, Control theory, Electronic engineering, Electrical and Electronic Engineering, Surge, business, Voltage
Abstract

A computer model for predicting the distribution of steep-fronted surges in the line-end coils of machine windings is described. The model uses certain aspects of previous models combined to achieve simplification of solution while retaining accuracy. The solution technique is based on multiconductor transmission line theory and modal analysis. Parameter evaluation is based on the relationship between capacitance, inductance and wave velocity. The theory is extended to include a number of series-connected coils. Experimental and computational results are presented to illustrate the application and accuracy of the model. >

Published
1989

13. Field Investigations into the Factors Governing the Severity of Prestriking Transients

Author

Acosta, J. and Cornick, K.J.

Abstract

Steep-fronted surges are a major cause of insulation failure in motor windings. These surges are produced by switching operations and will vary depending upon the type of system and type of circuit-breaker. Results of investigations carried out at a number of installations are described. The prime objective of these investigations was to determine the nature and severity of the switching transients produced during circuit-breaker closing operations and the variation of these transients with system parameters and type of circuit-breaker. Techniques used during these investigations, including on-site synthetic testing methods, will also be described. The value of these techniques in evaluating system characteristics will be demonstrated.

Published
1986
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