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No-load loss is the amount of power (watts) used by a device such as a transformer or electric motor when it is connected to the power line but is not delivering any useful output. For example, if your doorbell is run from a transformer, it may consume, say, 3 watts continuously. This ends up as heat due to the heating of its windings, and the energy needed to magnetise the iron core. When someone presses the doorbell, it may draw 6 watts, 3 of them going to the bell to make it ring.
Another example is an electric motor which is going round, but not driving anything. It may consume 100 watts, but its efficiency is zero. When it is driving, say, a machine tool it may consume 1000 watts, 900 of them being useful work in driving the machine.
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What is loss load factor?
A load loss factor, LLF,not loss load factor,Êis a calculation used by electrical utility companies to measure energy loss.Ê Its the ratio of average load loss to peak load loss.
Function of no-load in transformer in a open-circuit?
To calculate the no load current from transformer & core loss is also calculated.
Why are distribution transformers frequently designed to develop maximum efficiency at loads that are somewhat lower than rated value?
It is always desirable to run any equipment or device at maximum efficiency for that matter, not only the power transformer. Power transformer maximum efficiency occurs when copper loss is equal to iron loss. (or no load loss equals to load loss). This does not necessariliy mean that maximum efficiency occurs at maximum or full load. Generally the maximum efficiency occurs at relatively less than full load of the transformer.
Is wattmeter reading under no load test is equal to iron loss of the transformer?
Yes; that is the principle used in no-load tests on transformers. The current in the copper windings is zero on the secondary and low on the primary, so the copper loss is negligible.
How Core Loss is dependent on Frequency?
since at no load only excitation current(responsible for core loss ie iron loss) flow on the primary side so core loss current will be 1A and core loss = v1*i1*powerfactor. core loss = 1*11000*0.24= 2640watt.
What is loss load factor?
A load loss factor, LLF,not loss load factor,Êis a calculation used by electrical utility companies to measure energy loss.Ê Its the ratio of average load loss to peak load loss.
Which loss in transformer varies significantly with load?
Copper loss varies with the load.
When is the efficiency maximum in a transformer?
the efficiency is maximum in a transformer when no load loss is equal to load loss.
What are the factors affecting stability factor?
1.sudden application of load 2.loss of generation 3.loss of large load 4.a fault on the system
What are the factors affecting the transient stability?
1.sudden application of load 2.loss of generation 3.loss of large load 4.a fault on the system
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.
Function of no-load in transformer in a open-circuit?
To calculate the no load current from transformer & core loss is also calculated.
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.
Why impedance matching are important in communication circuit?
to reduce reflection loss from the load
Why are distribution transformers frequently designed to develop maximum efficiency at loads that are somewhat lower than rated value?
It is always desirable to run any equipment or device at maximum efficiency for that matter, not only the power transformer. Power transformer maximum efficiency occurs when copper loss is equal to iron loss. (or no load loss equals to load loss). This does not necessariliy mean that maximum efficiency occurs at maximum or full load. Generally the maximum efficiency occurs at relatively less than full load of the transformer.
Is wattmeter reading under no load test is equal to iron loss of the transformer?
Yes; that is the principle used in no-load tests on transformers. The current in the copper windings is zero on the secondary and low on the primary, so the copper loss is negligible.
How Core Loss is dependent on Frequency?
since at no load only excitation current(responsible for core loss ie iron loss) flow on the primary side so core loss current will be 1A and core loss = v1*i1*powerfactor. core loss = 1*11000*0.24= 2640watt.
