EPQU Journal - Volume 11 Issue 1

Measuring accuracy of electric energy in HV power networks

By Isabelle Heriakian / Published on Sat, 2005-02-12 18:07

This article presents the effect of secondary circuits of inductive current and voltage transformers on measuring accuracy in HV power networks. The basic parameters of instrument transformers were defined, such as errors or rated output. The impedance effect of the leads connecting secondary terminals with measuring instruments and the impact of burden power on the energy measuring error were analyzed. The calculation samples illustrate the procedure when assessing energy (power) measuring error.

Read full story

Main content

Popular content

Measuring accuracy of electric energy in HV power networks

By Isabelle Heriakian / Published on Sat, 2005-02-12 18:07

This article presents the effect of secondary circuits of inductive current and voltage transformers on measuring accuracy in HV power networks. The basic parameters of instrument transformers were defined, such as errors or rated output. The impedance effect of the leads connecting secondary terminals with measuring instruments and the impact of burden power on the energy measuring error were analyzed. The calculation samples illustrate the procedure when assessing energy (power) measuring error.

Read full story

Sensitivity of electrical equipment to voltage sags and short interruptions: recommendations for testing

By Isabelle Heriakian / Published on Fri, 2005-02-11 18:13

General testing procedures for testing different types of electrical equipment against various types of voltage sags and short interruptions are proposed and described in this paper. The recommendations for testing are discussed with respect to a number of sag and interruption parameters, non-ideal voltage supply characteristics, type of equipment, operating/loading conditions of the equipment and multiplicity of the malfunction criteria of the equipment. Presented analysis is illustrated using the examples of equipment sensitivity identified in tests.

Read full story

Single-phase power active filter using instantaneous reactive power theory – Theoretical and practical approach

By Isabelle Heriakian / Published on Thu, 2005-02-10 18:18

The paper deals with the new method of analysis, synthesis and experimentation of single-phase power active filters. By using a new particular transformation theory, the ordinary single-phase system can be transformed into an equivalent two-axes orthogonal one. The new original thought is based on the idea that ordinary single-phase quantity can be complemented by fictitious second phase so that both of them will create an orthogonal system, as is usual in three-phase systems.

Read full story

Mitigation of voltage flicker by superconducting synchronous condenser (supervar)

By Isabelle Heriakian / Published on Wed, 2005-02-09 18:22

Voltage flicker caused by the electric arc furnace (EAF) and the mitigation using the superconducting synchronous condenser (SuperVAR) by the American Superconductor Corp. are considered in this paper. The modeling of EAF, SuperVAR and the system used are discussed. Fast reactive power support to reduce voltage flicker problem by an EAF is desirable. We use the voltage fluctuation amplitude as an index to evaluate the effectiveness of SuperVAR for two different MVar levels.

Read full story

On the thickness of phosphor coating in fluorescent lamps and its impact on selected light parameters

By Isabelle Heriakian / Published on Tue, 2005-02-08 18:31

This article presents the results of research carried out on the formation of light parameters of the phosphor coatings and surfaces of fluorescent lamps. Particular attention has been paid to those parameters which influence the formation of light parameters such as light efficacy and ripple. The results of the measurements of light efficacy and light ripple are given in terms of the thickness of coatings and some of the physical parameters of phosphors used in AC powered mains frequency fluorescent lamps.

Read full story

123next ›last »

Archives

Explore complete archive

Popular content