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.
Q. Required Conditions for connecting two transformers in parallel? Ans: a) Voltage rating should be same b) Per unit impedance should be same c) Phase sequence should
Whose principle or law states that each point on a wave front may be considered a new wave source? Is it: w) Snell's Law x) Huygen's Principle y) Young's Law z)
Question : a) Embedded Systems will be Hard Real-Time Systems, Soft Real-Time Systems and Hybrid Real-Time Systems. Briefly explain all three types of Real-Time Systems, using
Explain ferroelectricity. Ferroelectricity: - Materials of ferroelectric have a high dielectric constant that is non-linear that is, this depends to a considerable extent on t
2's Complement Multiplication Two's complement multiplication follows the similar rules as binary multiplication. For illustration, (-4) × 4 = (-16) 1111
Electromagnetic torque The torque is given by the force on the armature winding multiplied by its radius. Force on a conductor in magnetic field B is: F=B.I.L so, T=B
what is zener breakdown mechanism ?
Hello may i know if it is possible for me to teach online on electrical maters?
i need tutor for teaching me matrix converter based upfc modelling and building using matlab
Q. Explain the working principle of an electronic voltmeter. Sol. Electronic voltmeter Basic Voltmeter: The addition of a series resistor, or multiplier, converts the
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