# ELECTRICAL MEASUREMENTS

 Course Code : RT31021 Author : uLektz University : JNTU Kakinada Regulation : 2013 Categories : Electrical & Electronics Format : ePUB3 (DRM Protected) Type : eBook

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Description :ELECTRICAL MEASUREMENTS of RT31021 covers the latest syllabus prescribed by JNTU Kakinada for regulation 2013. Author: uLektz, Published by uLektz Learning Solutions Private Limited.

Note : No printed book. Only ebook. Access eBook using uLektz apps for Android, iOS and Windows Desktop PC.

##### Topics
###### UNIT I MEASURING INSTRUMENTS

1.1 Classification – Deflecting, control and damping torques

1.2 Ammeters and Voltmeters – PMMC, moving iron type, dynamometer and electrostatic instruments – Expression for the deflecting torque and control torque

1.3 Errors and compensations– Extension of range using shunts and series resistance

1.4 CT and PT: Ratio and phase angle errors – Design considerations

###### UNIT II MEASUREMENT OF POWER AND ENERGY

2.1 Single phase and three phase dynamometer wattmeter – LPF and UPF – Expression for deflecting and control torques

2.2 Extension of range of wattmeter using instrument transformers – Measurement of active and reactive powers in balanced and unbalanced systems – Type of P.F. Meters

2.3 Single phase and three phase dynamometer and moving iron type Single phase induction type energy meter - Driving and braking. torques – errors and compensations

2.4 Testing by phantom loading using R.S.S. meter– Three phase energy meter – Tri vector meter – Maximum demand meters– Electrical resonance type frequency meter and Weston type synchroscope

###### UNIT III POTENTIOMETERS

3.1 Principle and operation of D.C. Crompton’s potentiometer – Standardization – Measurement of unknown resistance – Current – Voltage

3.2 AC Potentiometers:polar and coordinate types –Standardization – Applications

###### UNIT IV MEASUREMENTS OF PARAMETERS

4.1 Method of measuring low, medium and high resistance – Sensitivity of Wheat stone’s bridge – Carey Foster’s bridge– Kelvin’s double bridge for measuring low resistance

4.2 Loss of charge method for measurement of high resistance – Megger - Measurement of earth resistance

4.3 Measurement of inductance – Quality Factor - Maxwell’s bridge – Hay’s bridge – Anderson’s bridge

4.4 Measurement of capacitance and loss angle – Desauty bridge – Schering Bridge–Wagner’s earthing device–Wien’s bridge

###### UNIT V MAGNETIC MEASUREMENTS

5.1 Ballistic galvanometer – Equation of motion – Flux meter – Constructional details

5.2 Determination of B–H Loop methods of reversals six point method – AC testing

5.3 Iron loss of bar samples– Core loss measurements by bridges and potentiometers

###### UNIT VI DIGITAL METERS

6.1 Digital Voltmeter–Successive approximation

6.2 Measurement of phase difference – Frequency – Hysteresis loop using lissajious patterns in CRO – Ramp and integrating type

6.3 Digital frequency meter–Digital multimeter– Digital Tachometer.