What are the coils present in the energy meter?
The device consists of a pair of fixed coils, known as current coils, and a movable coil known as the potential coil. The current coils are connected in series with the circuit, while the potential coil is connected in parallel.
What are the two coils used in energy meter?
The coil of the series magnet is excited by load current while that of the shunt magnet is excited by a current proportional to the supply voltage. These two coils are respectively referred as current coil and potential coil (or pressure coil) of the energy meter.
How many coils are in a energy meter?
The metallic disc is acted upon by two coils. One coil is connected 0r arranged in such a way that it produces a magnetic flux in proportion to the voltage and the other produces a magnetic flux in proportion to the current. The field of the voltage coil is delayed by 90 degrees using a lag coil.
What is pressure coil in energy meter?
A coil having a large number of turns of fine wire is wound on the middle limb of the shunt magnet. This coil is known as voltage coil or pressure coil and it is connected across the supply mains. Hence in an energy meter, the energy measures in kWh and the magnitude of flux vary due to abnormal current & voltage.
What is the function of current coil and pressure coil in wattmeter?
While the pressure coil is connected in parallel with the load. Moreover, the current coil measures the current while the pressure coil measures the voltage. Both the coils are used in a wattmeter scale and to measure current or voltage in tension transmission lines.
How do Wattmeters work?
A wattmeter does a complex job, measuring the power flowing through an electrical circuit. It simultaneously measures the voltage and current values and multiplies them to give power in watts. The three main types are electrodynamic, electronic and digital.
What is braking in energy meter?
The braking system of the energy meter: The main part of this system is a permanent magnet called a brake magnet. This eddy current reacts with the flux and exerts a braking torque which opposes the motion of the disk. The speed of the disk can be controlled by changing flux.
What is the braking mechanism used in an energy meter?
Braking System The main part of this system is a permanent magnet called brake magnet. It is located near the disk so that eddy currents are induced in it due to movement of rotating disk through the magnetic field. This eddy current reacts with the flux and exerts a braking torque which opposes the motion of the disk.
What is current coil why it is used?
A current coil is popularly known to be used Can Crusher. This application is based on the electromagnetic field that is generated when a can is placed inside a coil which then gets further energized to bend and deform the can by compressing it into a flat disc. Current coils are also commonly used as electromagnets.
Why voltage coil is called pressure coil?
The device consists of a pair of current coils, and a movable potential coil. The current coilsare connected in series with the circuit, while the potential coil is connected in parallel. Its connected across the voltage and hence a proportional current flows through this coil.
What is coil use?
coil, in an electric circuit, one or more turns, usually roughly circular or cylindrical, of current-carrying wire designed to produce a magnetic field or to provide electrical resistance or inductance; in the latter case, a coil is also called a choke coil (see also inductance).
Why does a coil create a magnetic field?
A current through any conductor creates a circular magnetic field around the conductor due to Ampere’s law. The magnetic fields generated by the separate turns of wire all pass through the center of the coil and add (superpose) to produce a strong field there. The more turns of wire, the stronger the field produced.
How are electromagnetic coils used in Electrical Engineering?
Electromagnetic coils are used in electrical engineering, in applications where electric currents interact with magnetic fields, in devices such as electric motors, generators, inductors, electromagnets, transformers, and sensor coils. Either an electric current is passed through the wire of the coil to generate…
How is Rogowski coil used in energy metering?
Rogowski coil has long been used for high current measurement such as in sub-station transformers and arc wielding machines. It offers numerous advantages comparing with the other current sensing solutions.
How are current sensors used in energy meters?
In any electronic energy meter, current sensors play an important part in energy accuracy, cost, size, and safety. Current sensors can be shunt resistors, current transformers (CT), Rogowski coils, Hall-effect, and others, with choices primarily made based the accuracy requirement of the meter.
How does an electric coil in a circuit work?
Electric coils are one of the simplest forms of electronic components and provide inductance in an electrical circuit, an electrical characteristic that opposes the flow of current.