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How to calculate iron losses in dc machine
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Why are iron losses constant at all loads in a transformer?
because iron loss is depends on frequency and it is constant through out the operation ...irrespective from load
Will transformer heating be approximately the same for resistie inductive or capacitive loads of same VA rating?
Yes because the transformer heating (power losses) depend on the load current and the load voltage. It can be assumed that the voltage stays more or less constant, therefore the iron loss is also constant. The copper loss depends on the square of the load current. So it is the VA of the load that determines the power loss and any heating.
Transformer Output power less than input power?
A: Absolutely a power transfer will have an internal loss of IR . for a power transformer the loss can be as much of 20% or more if other magnetics are involved like iron screw holding the lamination together. Usually brass is used to reduce that loss.
Why is the efficiency of a transformer so high?
The efficiency of a transformer depends on its design and is equal to the power output divided by the power input. The difference between these two quantities is the power loss, which comes out in the form of heat. The power loss has two components, which are the power lost in the resistance of the windings, known as the copper loss, and the power lost in eddy currents in the magnetic core, the iron loss. The copper loss depends on the current, while the iron loss depends on the voltage. To increase the efficiency the designer can use thicker wire and a more massive iron core. Both these measures increase the size and cost of the transformer. Small transformers for electronic equipment might have efficiency of 80-90%, while power transformers used in electricity supply might have efficiency of 98%. It is necessary to use higher efficiency at the higher power levels because the amount of energy wasted is significant.
What is phase loss?
Phase loss is the loss of power to a specific area of the circuit. Phase loss can result from exposed wires or damaged wires or even downed power lines.
How does Lenz's Law explain power loss in transformers?
It doesn't, really. The power loss in transformers is broken down into copper loss and iron loss. The copper loss comes from the resistance of the windings in the transformer and depends on the load current, while the iron loss in the magnetic core depends on the magnetic flux density and is constant if the supply voltage is constant.
Why the efficiency of a power transformer increases with a decrease in Load at constant PF?
Maximum efficiency of a power transformer occurs when copper loss equals to iron losses. Decrease in current does not result in increase in efficiency unless the copper loss was more than iron loss and the decreased current made the copper loss is reduced and became equal to iron loss at some point.
Why the iron losses in a transformer is constant at all load prove that?
since the iron loss depends only on the volage and frequency,the supply volage is 230v ac.Hence iron loss is always constant
Why are iron losses constant at all loads in a transformer?
because iron loss is depends on frequency and it is constant through out the operation ...irrespective from load
Why iron loss is constant but copper loss is variable in a transformer?
Iron loss it includes the core loss is partically the same at all loads and copper loss the value of cu loss is found from short circuit test
Will transformer heating be approximately the same for resistie inductive or capacitive loads of same VA rating?
Yes because the transformer heating (power losses) depend on the load current and the load voltage. It can be assumed that the voltage stays more or less constant, therefore the iron loss is also constant. The copper loss depends on the square of the load current. So it is the VA of the load that determines the power loss and any heating.
What is iron loss?
Iron losses (Pi) are independent of of load which occur due to pulsation of flux in the core. Iron losses include both Hysteresis loss and eddy current loss and is same at all the loads.
Why transformer power expressed in KVA?
because of its losses i.e iron and copper losses. since iron loss depends on voltage (v)and copper loss depends on current(i).
What are core losses?
Iron losses are termed as core losses. There are mainly two losses - Copper loss and iron loss. Iron loss is no load loss.
Transformer Output power less than input power?
A: Absolutely a power transfer will have an internal loss of IR . for a power transformer the loss can be as much of 20% or more if other magnetics are involved like iron screw holding the lamination together. Usually brass is used to reduce that loss.
Difference between iron loss and hystersis loss?
In a transformer, there are two basic types of losses that are broken down even further: iron loss and copper loss. Hysteresis loss is part of what makes up the iron loss, but is not the only part of iron losses.
Why is the efficiency of a transformer so high?
The efficiency of a transformer depends on its design and is equal to the power output divided by the power input. The difference between these two quantities is the power loss, which comes out in the form of heat. The power loss has two components, which are the power lost in the resistance of the windings, known as the copper loss, and the power lost in eddy currents in the magnetic core, the iron loss. The copper loss depends on the current, while the iron loss depends on the voltage. To increase the efficiency the designer can use thicker wire and a more massive iron core. Both these measures increase the size and cost of the transformer. Small transformers for electronic equipment might have efficiency of 80-90%, while power transformers used in electricity supply might have efficiency of 98%. It is necessary to use higher efficiency at the higher power levels because the amount of energy wasted is significant.
