When a drum or disc of a non magnetic conducting material is placed in a rotating magnetic field, eddycurrents are induced in it. Units of measurement and their standards, which is concerned with the establishment, reproduction, conservation and transfer of units of measurement and their standards. Multiple choice questions and answers on measurement and. In the arrangement shown in fig a, a light aluminum piston is attached to the spindle that carries the pointer and moves with a very little clearance in a rectangular or circular air chamber closed at one end. Measuring instruments free download as powerpoint presentation. When the energy meter is connected in the circuit, the current coil carries the load current and the pressure coil carries the current proportional to the supply voltage. Basics of measuring instruments and types study buddy. Following are the advantages of induction type meters. Dynamometer and induction type energy meterinduction typeinstrument transformers. A volt meter is an instrument used to measure the potential difference between the two points in an electric circuit. Dynamometer and induction type energy meterinduction type instrument transformers. Driving system moving system breaking system registering system.
Potential and current transformers, ratio and phase angle errors, phasor. Induction type measuring instrument energy meter slideshare. Pdf magnetic induction measurements in distribution transformer. Vibrating reed type, electrical resonance type moduleii 10 hours instrument transformers. Power factormeter synchroscope frequency meterdigital. Study of single phase induction type energy meter or watt. Air friction damping arrangements of air friction damping are shown in fig. Induction type siqgle phase and three phase energy meter, compensation, creep, error, testing, frequency meters. The main components of an induction instrument are a magnetic system, a movable part, and a permanent magnet. Induction measuring instruments are classified as singleflux or multiflux instruments, depending on the number of alternating magnetic fluxes inducing a current in the movable part of the instrument. The reaction between the rotating flux and the eddy current produced by it creates a torque which rotates the disc or drum. Induction type siqgle phase and three phase energy meter, compensation, creep. For the tf measurements the measuring instrument has been installed in.
A website for electrical engineering education on machines,circuits,power systems,measurements,control systems,power electronics with projects online. Multiple choice questions and answers on measurement and instrumentation. Pdf in this project, the results of magnetic induction measurements into cores of distribution. Video 31 this video is about an introduction and working principle of induction type measuring instrument. The electrical measurements notes pdf em notes pdf book starts with the topics covering control and damping torques, design considerations type of p.
Electrical measurements pdf notes em pdf notes smartzworld. The principle of working and construction of induction type meter is very simple. Meters, double element and three element dynamometer wattmeter, errors and compensations, measurement of unknown resistance, method of measuring low, measurement of inductance, ballistic. Movingiron ammeters and voltmeters there are two basic forms of these instruments. Induction type measuring instrument energy meter 1. Induction electrical measuring instrument article about. Measuring instruments inductor measuring instrument scribd. They are inexpensive as compared to moving iron type instruments. The damping torque in indicating instruments can be provided by. Power factormeter synchroscope frequency meter digital. They have high torque is to weight ratio as compared to other instruments. They retain their accuracy over wide range of temperature as well as loads. A moving iron ammeter may be compensated for frequency errors by a. Dynamometer type wattmeter induction type wattmeter.
Moving iron ammeters and voltmeters there are two basic forms of these instruments. Methods of measurement based on agreed units and standards. Induction type energy meter ii electrical technology ii unit 3 s. Principles of electrical measurement by slawomir tumanski.
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