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major component of power loss in a transformer is secondary resistance.when transformer is operated under no load,no current flows through the under no load conditions transformer has just very small megnetic losses.

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โˆ™ 2011-04-20 05:11:40
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Q: How much power is lost in a power distribution transformer under no load?
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Is the power transformer switched off under light load conditions?

No, the transformer has to supply the load, whether it is light or heavy.

When secondary coil is open there is no current in the primary coil WHY?

I am assuming the question is about the power / distribution transformer and not the current transformer. The primary current is a function of load connected on secondary. With the open secondary, there is no load, no current, it is open circuit. Hence no primary current. However there is always some small amount of no load current in the primary winding.

Why unity power factor is used in load test?

The aim is to load the transformer with its rated voltage and current. There is no real need to use unity power factor but it demonstrates that the transformer can supply the rated power and it avoids placing a load with a poor factor on to the supply.

Is Power stored in distribution system?

No. It's transported through the distribution system to load centers.

Which types of relay is use in power transformer?

A 'power transformer' is a category of transformer used within electricity transmission and primary distribution systems. Relays are widely used with power transformers to provide various types of protection that will act to disconnect the transformer in the event of a fault. Examples of these relays include Buchholz relays, earth-fault relays, and differential relays. Relays are also used to operate a power transformer's automatic tap-changing mechanism in order to compensate for changes in load.

Related questions

Is the power transformer switched off under light load conditions?

No, the transformer has to supply the load, whether it is light or heavy.

Is secondary system essential for distribution transformer?

There's very little point in having a distribution transformer if its secondary winding isn't connected to a load! So, to answer your question, a 'secondary system' (by which you, presumably, mean 'load'), isn't 'essential' to a distribution transformer, it could just sit there doing nothing!

Why on load or off load tap changer is always connected in the primary side of a power or distribution transformer. And why distribution and power transformer are rated MVA?

The size of any switch depends on current it carries. Your statement is true for step down transformers. The primary is HV hence less current, so the tap changer is on primary side.

What is no load transformer and load transformer?

When transformer is connected to a load i.e; some machine, it is called at on load or load transformer and when a transformer is not connected to any load it is called at no load transformer.

What is the significant relationship of the no load loss in excitation current test in transformer?

The no load losses are the losses caused by energizing the transformer. These are constant losses, regardless of loading. This in effect tells you the efficiency of the transformer. (Power in) - (no load losses) = (Power out)

Difference between off load transformer and on load transformer?

Hope this helpsAn "OFF-Load tap transformer" can only have it's tap adjusted when it is De-energized,while the "On-Load tap transformer" can adjust its tap under load conditions.Kind RegardsHammad KhanUniversity of Western AustraliaAnswerAn 'off load' transformer is one whose secondary is open circuited, and not supplying a load. An 'on load' (not 'load') transformer is one that is connected to a load.

Why does your power drain as soon as you put a load on it?

It could be a couple of things. Voltage drop is one, if the distance of the load is too far from the source of power this will happen. The other thing is if you are using a step down transformer and it is under sized, as soon as you apply the load the transformer output will drop off. If this condition lasts the transformer will eventual fail.

Why transformer power factor taken unity?

It isn't! A transformer operating at no load has a very low power factor.

Why no load current in transformer small?

No load current is energizing current. This is effectively "lost" power, power used in the transformer to energize the core. It, therefore, should be small!

How does a automatic transfer switch work?

The load have deference two feeder like transformer &generator when the power of transformer shutdown the load get power from second feeder generatoraoto

Why transformer is rating kva?

Power is voltage times current times power factor. The power factor is determined by the load. As the transformer manufacturer has no idea of the power factor of the load the transformer is to supply, he can only specify the transformer's rated current and rated voltage, the product of which is apparent power, expressed in volt amperes.

What does a transformer do to a voltage in a power line?

At the power station end, it steps the generated voltage up to a very high level for transmission. At load centres, it steps down the transmitted voltage for distribution.

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