Anna University B.E. E&I - Semester 4 - ELECTRICAL MEASUREMENTS & INSTRUMENTS

Posted Date: 10 Dec 2007 Resource Type: Articles/Knowledge Sharing Category: General

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EI 237 ELECTRICAL MEASUREMENTS & INSTRUMENTS

1. DIFFERENT TYPES OF AMMETERS AND VOLTMETERS
Galvanometers – principle of operation, construction and sources of errors and compensation in PMMC & moving iron instruments – dynamometer and rectifier type ammeter and voltmeters.

2. WATTMETERS AND ENERGY METERS
Electrodynamic type wattmeter – theory and its errors – methods of correction – LPF wattmeter – phantom loading – induction type Kwh meter – theory and adjustments – calibration of wattmeters and energy meters.

3. POTENTIOMETERS AND INSTRUMENT TRANSFORMERS
Student type potentiometer û L and N type potentiometer – precision potentiometer – polar and co-ordinate type – A.C. potentiometers – their applications – construction and theory of operation C.T. and V.T. – phasor diagrams - characteristics – applications.

4. RESISTANCE MEASUREMENT
Measurement of low, medium and high resistances – ammeter – voltmeter method – Wheatstone bridge-precision form of Wheatstone bridge – Kelvin double bridge – Ductor Ohmmeter – series and shunt type ohmmeters – high resistance measurement – Megger – direct deflection methods – Price’s Guard wire method – Megohm bridges – loss of charge method – earth resistance measurement.

5. IMPEDANCE MEASUREMENT
A.C.Bridges – measurement of inductance, capacitance – Q of coil – Maxwell bridge – Maxwell wien bridge – Hey’s bridge – Schering bridge – Anderson bridge – Campbell bridge to measure mutual inductance – errors in A.C. bridge methods and their compensations – detectors – excited field a.c.alvanometer – vibration galvanometer.

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