What is the difference between phantom loading and direct loading?
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What is the difference between phantom loading and direct 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 is 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 are the advantages 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.
What is meant by direct loading?
When electrical energy utilised directly in a electrical circuit then it is called direct loading such as when Electrical energy is consumed by resistor and some amount in inductor and capacitor also .
What is LPF and UPF in wattmeter?
Answer: LPF wattmeter is used to measure power in inductive circuits. Inductive circuits have the property of lagging power factor and hence these wattmeters are used. So UPF(Unit Power Factor) Wattmeter is used in SHORT CIRCUIT TEST of Transformer.
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.
How do I reduce phantom power?
The easiest thing you can do to reduce phantom power is unplug anything you’re not using. This includes unplugging your phone or laptop charger when your device isn’t charging, not simply unhooking the device. Leaving cords plugged in when they’re not connected to anything is a common way phantom power can add up.
What is Phantom load example?
Examples of phantom loads are the clocks in VCRs and microwave ovens, the small black wall cubes that adapt DC appliances to run on AC house current, and the instant-on features in televisions and home entertainment centers. These loads typically range from 1 to 10 Watts per appliance.
What is an example of phantom load?
What is creeping error?
Whenever there is a current passing through the current coil with the coil excited, the disc of the energy meter rotates and measures the amount of energy consumed. The phenomenon of rotation of disc without any current through the current coil is known as Creeping. Due to this, the meter shows the incorrect reading.
What is meant by direct loading and indirect loading?
Direct loading can be used to Single transformation where as indirect transformation can be used to multiple transformations or files In the direct we can perform recovery process but in Indirect we cant do it .
Why LPF wattmeter is used for no load test?
No load losses of transformer, mainly because of magnetising /exciting ampere turns of the core — has low power factor and current is only a few \% of rated current. Hence the use of LPF wattmeter along with matched V&I range.