COMPUTERIZED SURVEY OF CURRENT INTENSITY IN SERIES RLC CIRCUIT VARYING POWER FREQUENCY " Integration of InnoVativE MeThodologies for ELectrical Measurements

“COMPUTERIZED SURVEY OF CURRENT INTENSITY IN SERIES RLC CIRCUIT VARYING POWER FREQUENCY "

Integration of InnoVativE MeThodologies for ELectrical Measurements VET-ELM

Leonardo da VinciPARTNERSHIPS

DG Education and Culture

ISTITUTO TECNICO INDUSTRIALE STATALE“ALESSANDRO VOLTA”

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WORKING GROUPWORKING GROUP

Prof. Salvatore Avianidirigente scolastico

Prof. Biagio De Rosa vicepreside

Prof. Mariarosaria Damatoinglese

Prof. Vincenzo D’Antonioelettrotecnica/sistemi

Prof. Lomonte PaoloTDP/Impianti elettrici

Prof. Roberto Scognamiglio elettronica

Prof. Vincenzo Venerusoelettrotecnica/sistemi




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INDEX

INTRODUCTION

EDUCATIONAL OBJECTIVES OF THE MEASURE

PREREQUISITES

DESCRIPTION OF THE EXERCISE COMPONENTS AND INSTRUMENTS




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INDEX TEST RUN

THEORETICAL FORMULAS

COMPUTERIZED DEVELOPMENT OF THE MEASUREMENT RESULTS

SIMULATION WITH SOFTWARE NATIONAL INSTRUMENT “MULTISIM”

EVALUATION GRID




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INTRODUCTION




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INTRODUCTION

IN ITALY THE TEACHING OF "ELECTRICAL MEASUREMENT" AS

PART OF THE CURRICULUM OF STUDIES

" INDUSTRIAL EXPERT - ELECTRICAL AND AUTOMATION SPECIALIZAZTION"

IS NO LONGER AN AUTONOMUS SUBJECT.

THE SUBJECT’ S CONTENT IS PART OF “ELECTRICAL

ENGINEERING” INCLUDING LABORATORY HOURS DURING

WHICH STUDENTS ARE TESTED THROUGH EXERCISES.

I.T.I.S.A. Volta-Napoli

INTRODUCTION

IN PARTICULAR THE SUBJECT "AUTOMATIC ELECTRIC SYSTEMS",

HAS BEEN INTRODUCED, WHICH MOREOVER, HAS THE TASK OF

CREATING A SYNTHESIS BETWEEN THE ACQUIRED KNOWLEDGE

DURING THE ENTIRE COURSE OF STUDY, INCLUDING A

CONTINUOUS LINK WITH OTHER DISCIPLINES, FIRST OF ALL

ELECTRICAL AND ELECTRONICS ENGINEERING COMPUTING.


INTRODUCTION

ON THE STRENGTH OF THESE INNOVATIONS, EVEN "ELECTRICAL

MEASUREMENT“ TEACHING HAS EXPERIENCED AN UPGRADE,

INTRODUCING ELEMENTS OF ELECTRONICS AND COMPUTERS.

HERE BELOW YOU CAN SEE AN EXAMPLE OF A "MEASURES

EXERCISE "






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AT THE END OF THE EXERCISE STUDENTS WILL:

1. GAIN AWARENESS OF THE CONDUCT OF SIMPLE AC CIRCUITS AND OF THE PHENOMENON OF RESONANCE

2. ACQUIRE THE ABILITY TO INTEGRATE KNOWLEDGE OF THE FOLLOWING DISCIPLINES:

ELECTRIC MEASURES ELECTRONICS AUTOMATIC SYSTEMS


PREREQUISITES




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PREREQUISITES

PUPILS SHOULD KNOW:

BASIC PRINCIPLES OF ALTERNATING CURRENT;

BASIC PRINCIPLES OF ELECTRICAL MEASUREMENT (MEASURES);

SOFTWARE USUALLY USED IN A PC;

SOFTWARE MICROSOFT EXCEL.


DESCRIPTION OF THE EXERCISE




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THE EXERCISE PLANS TO MAKE A SERIES OF CURRENT

MEASUREMENT IN ORDER TO DESCRIBE THE CONDUCT OF A

A.C. CIRCUIT WHEN POWER FREQUENCY CHANGES.

THE RESULTS ARE INPUTTED ON A PERSONAL COMPUTER, AND

TRASFERRED THROUGH FILE TO THE SOFTWARE EXCEL

FOR GRAPHIC AND ANALYTICAL PROCESSING OF DATA.



STEP OF WORK:

1 - DIRECT MEASUREMENT OF CURRENT IN A SERIES RLC CIRCUIT POWERED WITH VARIABLE FREQUENCY

2 - TRANSFER OF DIGITAL DATA MEASURED BY A DIGITAL MULTIMETRO ON A PERSONAL COMPUTER

3 - ANALYSIS OF THE BEHAVIOUR OF COMPONENTS AND CIRCUIT THROUGH AN EXCEL SPREADSHEET.



THE FOLLOWING FIGURE SHOWS THE SETUP CIRCUIT.


Figure 1

C

E

R

L

COMPONENTS AND INSTRUMENTS




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A FUNCTION GENERATOR WITH VARIABLE FREQUENCY FROM 10 A 20.000 Hz

A RESISTOR: 1 kOhm

AN INDUCTANCE: 100 mH

A CAPACITOR: 330 nF

DIGITAL MULTIMETER DM3051 RIGOLI COMPLETE WITH USB CONNECTION AND SOFTWARE INTERFACE

PERSONAL COMPUTER

SOFTWARE MICROSOFT EXCEL



DIGITAL MULTIMETER

FEATURES:

HIGH PRECISION

MULTIFUNCTIONAL

SUITABLE FOR AUTOMATIC DATA ACQUISITION

ACCESSORY WITH N. 2 SOFTWARE INTERFACE WITH PC (ULTRASENSOR AND ULTRALOGGER)



DIGITAL MULTIMETER

PICTURES



DIGITAL MULTIMETER:DATASHEET MULTIMETER



DIMENSIONING OF CIRCUIT COMPONENTS :

COMPONENTS HAVE BEEN CHOSEN IN ORDER TO OBTAIN A

RESONANCE FREQUENCY OF APPROXIMATELY 870 Hz AND

TO LIMIT THE CIRCUIT CURRENT TO A VALUE NOT

EXCEEDING 5 mA


TEST RUN




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TEST RUN

THE CIRCUIT WILL POWERED BY A SINUSOIDAL SIGNAL VARIABLE

FREQUENCY FROM 10 TO 15000 Hz N. 25 MEASURES WILL BE MADE

FOR VALUES OF GROWING FREQUENCY.

BY INCREASING THE FREQUENCY THE CURRENTE VALUE WILL

INCREASE ACHIEVING ITS MAXIMUM VALUE AT THE RESONANCE

RATE. AFTER REACHING ITS RESONANCE RATE ITS VALUE WILL

DECREASE.


TEST RUN I.T.I.S.

A. Volta-Napoli

THEORETICAL FORMULA




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THEORETICAL FORMULA

V = Z I

Z = R + j (XL – XC)

XL = 2*π*f*L

XC = 1/(2*π*C )

fr = 1/(2π*L*C )1/2

I = V / Z


COMPUTERIZED DEVELOPMENT OF

THE MEASUREMENTS RESULTS




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COMPUTERIZED DEVELOPMENT OF THE MEASUREMENTS RESULTS

THE RESULTS OF THE MEASUREMENTS ARE TRANSFERRED TO THE

SOFTWARE TOOL KIT.

ONCE ACQUIRED THE RESULTS ON AN INTERCHANGE FILE,

DATA ARE INSERTED INTO AN EXCEL FILE AND PROPERLY

PROCESSED


COMPUTERIZED DEVELOPMENT OF

THE MEASUREMENTS RESULTS


COMPUTERIZED DEVELOPMENT OF THE MEASUREMENTS RESULTS


SIMULATION WITH SOFTWARE NATIONAL

INSTRUMENT “MULTISIM”




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SIMULATION WITH SOFTWARE NATIONAL INSTRUMENT MULTISIM

FOR EDUCATIONAL USE, A “MULTISIM” SOFTWARE SIMULATION WAS

MADE, BEFORE THE LAB TESTS.


SIMULATION SOFTWARE WITH NATIONAL INSTRUMENT MULTISIM

ON THE FOLLOWING PAGES WILL BE SHOWN :

1 – THE CIRCUIT DIAGRAM

2 – PERFORMANCE CHART WITH THE FUCTION OF CURRENT

INTENSITY - FREQUENCY

3 - SURVEY ON THE CHART OF THE FREQUENCY OF RESONANCE



THE CIRCUIT

DIAGRAM



PERFORMANCE

CHART WITH

THE FUNCTION

OF CURRENT

INTENSITY/

FREQUENCY

(BODE)




SURVEY ON THE CHART OF THE FREQUENCY OF RESONANCE

EVALUATION GRID




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EVALUATION GRID


EVALUATION GRID


EVALUATION GRID


Documents

COMPUTERIZED SURVEY OF CURRENT INTENSITY IN SERIES RLC CIRCUIT VARYING POWER FREQUENCY " Integration of InnoVativE MeThodologies for ELectrical Measurements