What is the working 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 two types of moving iron instrument?
Moving iron type instruments are of mainly two types. Attraction type and repulsion type instrument. Whenever a piece of iron is placed nearer to a magnet it would be attracted by the magnet. The force of this attraction depends upon the strength said magnetic field.
What is the operating principle of Attraction type MI instrument?
The working principle of attraction type moving iron instrument is based on magnetic attraction, which attracts an iron piece when placed near a magnet field. Here, the magnet field will be produced by an electromagnet.
Why do we use AC for moving iron?
The moving iron instrument is used for measuring both the direct and alternating current whereas the moving coil is used for the DC measurement. In moving iron instruments, the gravity or spring provides the controlling torque to the instrument.
What is the principle of wattmeter?
The working of induction type wattmeter is based on the principle of electromagnetic induction. The induction wattmeter consists of two laminated electromagnets viz. Shunt Magnet and Series Magnet. The shunt magnet is connected across the supply and carries a current proportional to the supply voltage.
What is the classification of moving iron instrument?
There are two general types of moving-iron instruments namely: Repulsion (or double iron) type (figure 1) Attraction (or single-iron) type (figure 2)
What is the difference between MC and MI instruments?
The MI iron instrument has the non-uniform scale. The moving iron instrument consumes more power as compared to the moving coil instrument. The moving iron instrument is used for measuring both the direct and alternating current whereas the moving coil is used for the DC measurement.
What is repulsion type moving iron instrument?
Repulsion type moving iron instruments are used both for ac and dc measurements. In these instruments, when current flows through the coil, the two vanes i.e., fixed vane and movable vane are magnetized and same polarities are induced in it which results in a force of repulsion between them.
How do you classify moving iron type instrument?
There are two general types of moving-iron instruments namely:
- Repulsion (or double iron) type (figure 1)
- Attraction (or single-iron) type (figure 2)
What is Mi and MC?
Home / Electrical Articles / Comparison between moving-iron (M.I) instruments and moving-coil( M.C)instruments.
Why moving iron is used for both dc and ac?
As the operating torque is directly proportional to the square if the operating current. Thus, moving iron instruments are unpolarised instruments i.e. they are independent of the direction in which the current passes. Therefore, the instruments can be used on both ac and dc.
What is the working principle of Electrodynamometer?
The Electrodynamometer wattmeter working principle is very simple and easy. It is based on the theory of a current-carrying conductor experiences a magnetic force when it is placed in a magnetic field. Hence there will be a deflection of pointer that took place due to the mechanical force.
What is the principle of a moving iron instrument?
Moving iron instruments are of two types: Principle – When an unmagnetized soft iron piece is placed in the magnetic field of a coil, the piece is attracted to the coil. The moving system of the instrument is attached to a soft iron piece and the operating current is passed through a coil placed adjacent to it.
What can a moving iron be used for?
Moving iron instruments are used as Voltmeter and Ammeter only. Both can work on AC as well as on DC. Instrument used to measure current in the circuit. Always connected in series with the circuit and carries the current to be measured.
How does a moving iron scale system work?
The moving system of the instrument is attached to a soft iron piece and the operating current is passed through a coil placed adjacent to it. The operating current sets up a magnetic field that attracts the iron piece and thus creates deflecting torque in the pointer to move over the scale.
How does a moving iron instrument deflect torque?
The deflecting torque in any moving-iron instrument is due to forces on a small piece of magnetically ‘soft’ iron that is magnetized by a coil carrying theoperating current. In repulsion type moving–iron instrument consists of two cylindrical soft iron vanes mounted within a fixed current-carrying coil.