Ileana I Baran

University Politehnica of Bucharest, Electrical Power Engineering, Faculty Member

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Papers by Ileana I Baran

Study on the Acquisition, Analysis, and Statistical Processing of Data in a Transformation Substation

2020 International Symposium on Fundamentals of Electrical Engineering (ISFEE)

This paper was based on data obtained from a 20/0.4 kV substation, from a working day, purchased ... more This paper was based on data obtained from a 20/0.4 kV substation, from a working day, purchased using a class A power quality analyzer. From the set of data obtained, from the analyzer reports, the study of case was limited to data acquisition, data analysis and statistical processing of data on currents and voltages.

Numerical Model for High Voltage Insulating String Behavior

2021 12th International Symposium on Advanced Topics in Electrical Engineering (ATEE)

Knowing how insulating strings behave to different types of electrical stresses is useful in seve... more Knowing how insulating strings behave to different types of electrical stresses is useful in several situations including: designing the overhead transmission line and choosing the protection devices or the right interpretation of the records generated by the SCADA system. The integrity of the insulating strings is tested at commissioning and it can periodically be verified using laboratory tests involving standardized voltage forms. As a result, their behavior is well documented at lightning and switching impulse voltage, without insisting on other random voltage forms. Considering that during normal operation the electric stresses do not have standardized forms, we propose a numerical model in ATPEMTP that approximates the behavior of the insulator strings to any impulse voltage variation for different geometries and different weather conditions using the results obtained during standardized laboratory tests.

Side effects of the power frequency magnetic field mitigation

2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE), 2017

The paper aims to assess side effects which occur as a result of measures adopted to reduce the e... more The paper aims to assess side effects which occur as a result of measures adopted to reduce the electromagnetic field in the vicinity of overhead power lines, respectively using the phases' transposition for double circuit transmission lines. Practical considerations about the accuracy of magnetic field calculation were discussed considering the real positions of conductors, the optimal phasing in the case of double-circuit lines and the losses which appear in ground wire(s) in different configuration of phases.

Power losses on overhead lines under various loading regimes and weather conditions

2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE), 2017

The paper will present the first results of an extended analysis based on synchronously recorded ... more The paper will present the first results of an extended analysis based on synchronously recorded electrical and weather data, aimed to numerically evaluate the stochastic variation of transmission power losses measured on a given 400 kV line, in correlation with different environmental influence factors such as air temperature and pressure, dew point, wind speed and direction, type and amount of precipitation reported at 14 meteorological stations.

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components of the electromagnetic environment related to the

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Fault Analysis and Lightning Location Sy Ightning Location Sy Ightning Location Sy Ightning Location Systems Stems

This paper briefly describes the Romanian lightning monitoring system This paper briefly describe... more This paper briefly describes the Romanian lightning monitoring system This paper briefly describes the Romanian lightning monitoring system This paper briefly describes the Romanian lightning monitoring system This paper briefly describes the Romanian lightning monitoring system performances performances and analyses the possibility to and analyses the possibility to and analyses the possibility to and analyses the possibility to use the lightning database use the lightning database use the lightning database use the lightning database to develop tools for the design and maintenance of the assets or outages forensic. to develop tools for the design and maintenance of the assets or outages forensic. to develop tools for the design and maintenance of the assets or outages forensic. to develop tools for the design and maintenance of the assets or outages forensic.

High-Frequency Disturbances of Modern Lamps, a Statistical Approach

2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE), 2019

The paper presents an analysis of the HF disturbances emitted by modern lamps such as Compact Flu... more The paper presents an analysis of the HF disturbances emitted by modern lamps such as Compact Fluorescent Lamps and Light Emitting Diodes lamps, based on a statistical approach. For a given lamp, the level of the conducted disturbances emitted in CISPR Bands A and B during the stepped frequency scan was recorded by an EMI Receiver and then, considered as a data sample selected from a statistical population containing all the possible values of the disturbance. Each of the resulting samples has been processed in order to find the best theoretical model fitting the empirical cumulative distribution function. As will be shown, this approach allows the identification of a specific signature for the emission of a given lamp, and the use of this signature in order to compare emissions or to predict different characteristics of the emission, including the probability to exceed limits.

The behavior of high voltage insulators during the up-and-down procedure

2017 International Conference on ENERGY and ENVIRONMENT (CIEM), 2017

Industrial tests of high voltage equipment insulation at impulse voltages are carried out followi... more Industrial tests of high voltage equipment insulation at impulse voltages are carried out following rigorously described procedures and require, as a rule, long time duration and, implicitly, significant costs. Reducing the duration of these tests, as well as the possibility of disruptive voltage prediction has been always an objective of interest. This paper involved the rigorous statistical processing of a large number of recordings made during the testing of high-voltage insulator strings (with composite insulators and having rated voltage of 110 kV, 220 kV and 400 kV), fully equipped, using the up-and-down method. The aim was to describe the behavior of such equipment during lightning impulse tests, to know characteristic parameters of disruptive discharges, as well as to estimate the 50% voltage value based on previously recorded data, in order to reduce the number of voltage applications which do not provide relevant information.

Benefits and Problems raised by Multi-circuit Overhead Lines Operation

2021 12th International Symposium on Advanced Topics in Electrical Engineering (ATEE)

The paper presents a short analysis of benefits and disadvantages of multi-circuit overhead lines... more The paper presents a short analysis of benefits and disadvantages of multi-circuit overhead lines operation. Nowadays, the problem to build a new overhead line is a very difficult one because of land cost and different properties crossed by it, environmental impact, opposition of large public etc. Therefore, the solution to use same tower to support many circuits, with same or different rated voltage, also for AC and DC systems is very attractive. The main advantage is that of use of a narrow corridor to transmit a large amount of power. But other problems must be solved in order to make this type of line working properly, from solving the mutual influence of the circuits to lightning protection and up to the low frequency electromagnetic fields profile recorded near to ground.

Procedure for Assessing Normality in Small Size Samples of Physiological Data

This paper reports an experimental study for physiological signals acquisition, using artery appl... more This paper reports an experimental study for physiological signals acquisition, using artery applanation tonometry method. The records acquired from a small size sample (20 subjects) were measured with Omron HEM 9000 AI device. Results are analysed at univariate level in order to identify, estimate the statistical model of data and validate the parameters inferred for each of the proposed theoretical distribution laws.

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Features of magnetic fields produced by distorted or unbalanced systems of currents

2018 18th International Conference on Harmonics and Quality of Power (ICHQP), 2018

As it is well known, at least in the low frequencies domain, generally considered up to 9 kHz, th... more As it is well known, at least in the low frequencies domain, generally considered up to 9 kHz, the power quality and electromagnetic compatibility are strongly connected. A poor power quality (as example, high level of harmonics, dips, voltage variations etc.) can lead to unwanted interferences in certain consumers, and reciprocally, a poor design or a badly chosen operation mode of a consumer supplied by a network can produce voltage distortions which can be quantified through power quality parameters. The paper goal is to find a relation between the harmonic currents' level and also an unbalanced system of currents flowing through a three-phase circuit and the surrounding magnetic field. A new concept is introduced, namely “total harmonic magnetic field distortion” and the lack of correlation between magnetic field and currents' distortion was studied theoretically and experimentally.

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Statistics of Lightning Occurrence and Lightning Current ’ S Parameters Obtained Through Lightning Location Systems

Lightning data have been collected by the French Lightning Detection and Location Network FLDLN, ... more Lightning data have been collected by the French Lightning Detection and Location Network FLDLN, the so-called “Météorage” network, over a region situated between 43-45 degrees latitude North and 4-8 degrees longitude East, during the entire year 1999. For more clearness the above mentioned region was marked on the map of France reproduced in figure 1. The area of the observation region can be evaluated to 71150 km. The events recorded by FLDLN are the return strokes in cloud-to-ground flashes. Each event recorded in the database receives an identification number and it is stored with the following attributes: date (year, month, day), time (hour, second), impact coordinates (longitude and latitude), polarity and crest value of the current. If several successive events are identified as return strokes belonging to the same flash each return stroke will receive the same identification number, which will become the identification number of the flash. Figure 1 Position of the observatio...

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Interlaboratory Tests and Transfer Standards for Conducted Electromagnetic Disturbances

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1 coatu@uhv.helios.pub.ro , 2 a_ignea@etc.utt.ro , 3 licpe@dicpe.icpe.ro , 4 amarin@icmet.ro ... ... more

Fault Analysis and Lightning Location Systems

This paper briefly describes the Romanian lightning monitoring system performances and analyses t... more

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Evaluation of environmental low frequency magnetic fields in occupational exposure

by Ileana I Baran and Alexandru M Morega

2014 International Conference and Exposition on Electrical and Power Engineering (EPE), 2014

Low frequency electromagnetic hot spots in air insulated substations

by Ileana I Baran and Marian Costea

2016 International Conference on Applied and Theoretical Electricity (ICATE), 2016

Weather-based assessment of the overhead line conductors thermal state

2015 IEEE Eindhoven PowerTech, 2015

Sparkover of a Rod/rod Gap Stressed with Impulse Voltages of Non-Standard Wave-Shape II Influence of Humidity

Lightning current parameters-correlations and derived statistics

The CIGRE-defined lightning current parameters were replaced by a new set of parameters, slightly... more The CIGRE-defined lightning current parameters were replaced by a new set of parameters, slightly different, especially for time-components, and univariate analysis was performed for all the involved random variables. Multivariate frequency distribution of the new set of parameters was also analysed and some practical conclusions related to time to crest and steepness of the current, important for lightning protection applications, are presented.

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Statistics of Lightning Occurrence and Lightning Current's Parameters Obtained Through Lightning Location Systems

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