What is the principle of moving iron instrument?
Definition: The instrument in which the moving iron is used for measuring the flow of current or voltage is known as the moving iron instrument. It works on the principle that the iron place near the magnet attracts towards it. The force of attraction depends on the strength of the magnet field.
What are the advantages of moving iron instrument?
Advantage of Moving iron Instrument
- It is a universal instrument which can be used for the measurement of AC and DC quantities.
- These types of instruments have high value of torque to weight ratio.
- It is very cheap due to simple construction.
- These instruments are quite robust due to its simple construction.
What are the two types of moving coil instruments?
There are two types of moving coil instruments namely, permanent magnet moving coil type which can only be used for direct current, voltage measurements and the dynamometer type which can be used on either direct or alternating current, voltage measurements.
What is the working principle of galvanometer?
The main function of a galvanometer is to measure the presence, direction, and electric current in the conductor. This works on the principle of mechanical energy to electric energy. Once the current is in the magnetic field after the supply is turned on, the magnetic torque can be realized.
What are the instrument used in measuring AC current?
Ammeter, instrument for measuring either direct or alternating electric current, in amperes. An ammeter can measure a wide range of current values because at high values only a small portion of the current is directed through the meter mechanism; a shunt in parallel with the meter carries the major portion.
What are the principles of a moving iron instrument?
The basic construction of attraction type moving iron instrument is illustrated bellow A thin disc of soft iron is eccentrically pivoted in front of a coil. This iron tends to move inward that is from weaker magnetic field to stronger magnetic field whencurrent flowing through the coil.
How is a moving iron instrument a repulsion instrument?
Repulsion-type Moving-Iron Instruments In the repulsion type, there are two vanes inside the coil. One is fixed and the other is movable. These are similarly magnetized when the current flows through the coil and there is a force of repulsion between the two vanes resulting in the movement of the moving vane.
How are the vanes of an iron instrument magnetized?
Ø It is clear that whatever may be the direction of the current in the coil of the instrument, the iron vanes are so magnetized that there is always a force of attraction in the attraction type and repulsion in the repulsion type of instruments.
How is the attraction of an iron vane determined?
The attraction type of moving iron instrument depends on the attraction of an iron vane into a coil carrying the current to be measured. The figure shows an attraction-type moving iron (MI) instrument. An attraction type moving iron instrument A soft iron vane IV is attached to the moving system.