How does electrodynamic wattmeter work?
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 working principle of dynamometer type wattmeter?
Dynamometer type wattmeter works on very simple principle and this principle can be stated as when any current carrying conductor is placed inside a magnetic field, it experiences a mechanical force and due to this mechanical force deflection of conductor takes place.
What is the principle of dynamometer type instrument?
Dynamometer Type Wattmeter Working Principle. In these wattmeters, the field produced by the current-carrying moving coil tries to come in line with the field produced by the current-carrying fixed coil, and a deflecting torque is exerted on the moving system. As a result, deflection takes place in the pointer.
How does power factor meter work?
The basic working principle of power factor meter is similar to that of dynamometer type wattmeter i.e. when the field produced by moving system tries to come in line with the field produced by the fixed coil, deflecting torque is exerted on the moving system which deflects the pointer attached to it (the moving system …
What is meant by phantom loading?
Phantom Loading is a loading condition in which an energy meter is connected to factious or phantom load for testing of energy meter with high current rating. Such loading is favorable to avoid wastage of energy during the test of measurement instrument.
What is the resistance of wattmeter?
The circuit is used to measure the power consumed by the load. Resistance of the current and potential coils of the wattmeter is 0.02 Ω and 1000 Ω respectively.
What are the two types of wattmeter?
Types of Wattmeters
- Ammeter. The technique used by an ammeter underlies most wattmeters.
- Digital Wattmeters.
- Professional Wattmeters.
What is the difference between direct loading and phantom loading?
Direct loading requires rated voltage and current and so power is large. Testing at various power factor is also easy in phantom loading . It requires only a phase shifting transformer to shift phase of voltage w r t to current. No elaborate loading arrangement for various power factor is required.
What causes phantom load?
What Devices Cause Phantom Load? Anything with a remote control. These appliances use electricity 24-7, even if it’s not always at full power. Appliances or devices with clocks.
How is 3 phase watts calculated?
AC three phase amps to watts calculation formula
- P(W) = √3 × PF × I(A) × VL-L(V) So watts are equal to square root of 3 times power factor PF times amps times volts:
- watt = √3 × PF × amp × volt. or.
- W = √3 × PF × A × V. Example.
- P = √3 × 0.8 × 3A × 110V = 457W. Watts calculation with line to neutral voltage.
What is multiplying factor in wattmeter?
Step3: The Multiplication Factor (MF) is: MF = (voltage range x current range x power factor)/(range of the wattmeter scale).
What is calibration of energy meter?
Energy meter calibration is a process required to determine and reduce the error when the energy is measured. The errors in the energy meter can be caused by different sources like voltage transformers, current transformers errors due to phase angle, crystal oscillators, etc.
What is the advantage of phantom loading?
Phantom loading is a fictitious loading that resembles the actual full-load conditions. The main advantage of testing a meter under phantom loading conditions over direct loading one is that the power or energy consumption is comparatively too small.
How do you reduce phantom loads?
How To Reduce Phantom Loads
- Unplug items that are not in use.
- Plug sensitive electronics such as computers, televisions or DVD players into surge suppressors, and then switch off the surge suppressor to eliminate the phantom power load.
What is difference between direct loading and phantom loading?
What is 3phase circuit?
Three-phase power is a three-wire ac power circuit with each phase ac signal 120 electrical degrees apart. Residential homes are usually served by a single-phase power supply, while commercial and industrial facilities usually use a three-phase supply.
How many watt is 1kVA?
1,000 watts
kW or kilowatt is a unit of electric power. It is equal to 1,000 Joules per second and it measures how fast the energy is transferred. That means that in DC circuits, 1 kVA is equal to 1 kW. That means that 1 kVA is equal to 1,000 watts.
What is the working principle of electrodynamometer wattmeter?
The controlling torque is provided by two spiral springs. Air friction damping is provided in electrodynamometer wattmeter. A pointer is attached with the moving coil. When electrodynamometer wattmeter is connected in the circuit to measure the electric power.
What are the errors in the electrodynamometer type wattmeters?
Following are the errors in the electrodynamometer type wattmeters: Errors in the pressure coil inductance. Errors may be due to pressure coil capacitance. Errors may be due to mutual inductance effects.
What is the instantaneous deflecting torque of electrodynamometer wattmeter?
In case of electrodynamometer wattmeter, i1 is current through PC and i2 is current through CC. Therefore deflecting torque The above expression gives the instantaneous deflecting torque of electrodynamometer wattmeter.
Which type of damping is provided in electrodynamometer wattmeter?
Air friction damping is provided in electrodynamometer wattmeter. A pointer is attached with the moving coil. When electrodynamometer wattmeter is connected in the circuit to measure the electric power. The current coil carries the load current and the potential coil carries a current proportional to the load voltage.