Measuring instruments inductor measuring instrument scribd. Moving iron ammeters and voltmeters there are two basic forms of these instruments. Induction electrical measuring instrument article about. 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. The main components of an induction instrument are a magnetic system, a movable part, and a permanent magnet. Following are the advantages of induction type meters. Dynamometer and induction type energy meterinduction type instrument transformers.
A volt meter is an instrument used to measure the potential difference between the two points in an electric circuit. Pdf in this project, the results of magnetic induction measurements into cores of distribution. Movingiron ammeters and voltmeters there are two basic forms of these instruments. Basics of measuring instruments and types study buddy. The damping torque in indicating instruments can be provided by. Methods of measurement based on agreed units and standards. They have high torque is to weight ratio as compared to other instruments. Induction type siqgle phase and three phase energy meter, compensation, creep, error, testing, frequency meters. They retain their accuracy over wide range of temperature as well as loads. 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. When a drum or disc of a non magnetic conducting material is placed in a rotating magnetic field, eddycurrents are induced in it.
The principle of working and construction of induction type meter is very simple. Pdf magnetic induction measurements in distribution transformer. Multiple choice questions and answers on measurement and instrumentation. Measuring instruments free download as powerpoint presentation. Dynamometer and induction type energy meterinduction typeinstrument transformers. Induction type energy meter ii electrical technology ii unit 3 s.
Induction type siqgle phase and three phase energy meter, compensation, creep. Multiple choice questions and answers on measurement and. The electrical measurements notes pdf em notes pdf book starts with the topics covering control and damping torques, design considerations type of p. Vibrating reed type, electrical resonance type moduleii 10 hours instrument transformers. Dynamometer type wattmeter induction type wattmeter. Power factormeter synchroscope frequency meter digital. The reaction between the rotating flux and the eddy current produced by it creates a torque which rotates the disc or drum. Principles of electrical measurement by slawomir tumanski. They are inexpensive as compared to moving iron type instruments. Induction type measuring instrument energy meter 1. Potential and current transformers, ratio and phase angle errors, phasor. Electrical measurements pdf notes em pdf notes smartzworld. A moving iron ammeter may be compensated for frequency errors by a. Meters, double element and three element dynamometer wattmeter, errors and compensations, measurement of unknown resistance, method of measuring low, measurement of inductance, ballistic.
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