Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Electromechanical Meters
Electromechanical energy meters are based on the Ferraris Principle (see note in the margin). The working of these meters is explained.
Working of Electromechanical Meters
The meters have a revolving metallic disc mounted on jewel bearings or magnetic suspension bearings. The display is cyclometer or mechanical counters and accuracy is classically 1% or 2% (class 1.0 or 2.0). They cater to limited tariffs applicable majorly to 1-phase or 3- phase direct connected segment (whole current meters).The electromechanical induction meter operates through counting the revolutions of the disc that rotates at a speed proportional to the power consumed.
The number of revolutions is, therefore, proportional to the energy usage. The metallic disc is acted upon through three magnetic fields, one proportional to the voltage, the other to the current and a third constant field supplied by a permanent magnet. One of the varying fields induces currents in the metallic disc, that are then acted upon through the other varying field to produce a torque.
This results in the torque being proportional to the product of the current and voltage, that is power. As the metallic disc rotates through the permanent magnetic field, eddy currents are again produced that dissipate energy (because the disc has some resistance) and act to slow the rotation. This drag is proportional to the rotation speed. The equilibrium among the applied torque and the drag results within a speed proportional to the power. The rotating disc in this category of meter is, actually, an electric motor of a category known as a reluctance motor or eddy current motor. It consumes a little amount of power, classically around 2 W.
Calculate the cross-sectional area, in mm 2 , of a piece of aluminium wire 100 m long and having a resistance of 2Ω. Take the resistivity of aluminium as 0.03 x 10-6 Ωm.
Draw an electrical relay diagram rung showing a N/O contact of CR1(coil) in series witha N/C contact of CR2(Coil), operating a lamp L1. A delay-on (TON) relay has a preset of 5.
please, how do i design a linear phase stable recursive digital filter
Design a low noise amplifier using an Infineon RF transistor BFP640. The amplifier is to be used to amplify the L2 GPS signal and so the centre frequency is 1227MHz and bandwidth 4
Q. Draw the circuit of a two stage RC coupled amplifier?
Shunt DC motor In this arrangement, the armature and field coils are connected in parallel (the motor is called 'shunt connected'). Analysis With refere
Potentiometric type DVM: A potentiometric type of DVM, employs voltage comparison technique. In this DVM the unknown Voltage is compared with a reference voltage value is fixed by
1. Design four (4) different 5 volt DC power supplies to operate from 230 volts AC. The four power supplies are to have the same full wave rectifier with capacitive filte
Q. Illustrate Electric Potential and Voltage? When electrical forces act on a particle, it will possess potential energy. In order to describe the potential energy that a parti
Selection of Right- Flex : It is also important that the flex we choose is appropriate to the appliance used. Like fuses, the cables and flexes are also rated according to their
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd