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In transformer core flux depends on voltage whereas leakage flux depends on current?
In a Transformer, Core flux is the difference of primary flux and Secondary flux which are opposite to each other in direction. There difference is equal to the no load flux at all loads. So, some of primary flux passes through the core and remaining becomes leakage flux (Because Secondary flux forces it to get out of the core). Same is the case with Secondary flux. Now, flux is directly proportional to Voltage and Current. When Current increases due to increased load (and voltage remains same): Then both primary and secondary flux increase. Because both of them increase, so there difference remains same. And all remaining flux is forced out. Hence leakage flux increases with current, but Core flux remains constant. When Primary Voltage is increased: Then only primary flux increases. So difference of this new increased primary flux and previous same secondary flux increases. Hence Core flux increases with voltage, But leakage flux does not. That's how In transformer core flux depends on voltage whereas leakage flux depends on current.
Why open circuit test the ohmic losses are negligible in comparison with normal core loss-explain?
In the open circuit test, the voltage applied to the transformer is at its rated value with no load (open terminals), resulting in minimal current flowing through the windings. As a result, the copper losses (ohmic losses) in the windings are negligible since the current is minimal. The main power loss in this test is from core losses due to hysteresis and eddy currents in the core material, which are much larger than the ohmic losses when the transformer is under load.
Why do power lines have a high voltage in order to minimize current and heat loss?
Power lines have a high voltage to reduce the amount of current flowing through them, which helps to minimize heat loss and energy waste during the transmission of electricity.
What the threshold voltage depends on?
The threshold voltage of a device, such as a transistor, depends on its physical structure and material properties, such as channel length, channel doping concentration, oxide thickness, and gate material. It is also affected by external factors like temperature and supply voltage. In digital circuits, the threshold voltage is a critical parameter that determines the device's switching behavior.
How many amps to a kilowatt?
The relationship between amps and kilowatts depends on the voltage of the circuit. To calculate the amperage for a given kilowatt value, you need to know the voltage as well. The formula to convert kilowatts to amps is Amps = (kW * 1000) / Volts.
Is core loss same as no load loss in transformer?
Yes, that is almost true, apart from a very small copper loss in the primary winding that carries the small magnetising current. The core loss (iron loss) depends on the applied voltage. This loss is measured by the open-circuit test, carried out at the working voltage.
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.
What are losses of transformer?
Core loss is one of the many fixed losses in a transformer. This means that no matter the loading of the transformer there this loss would be fixed unlike copper loss which depends on the loading of the transformer.
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).
Why core is made up of silicon steel?
produces magnetic properties,such as small hysteresis area and permeability Hysteresis loss depends upon the material of the core
What happens when a transformer is operated at no load with high voltage?
It depends on how much voltage you have applied. If you apply rated voltage nothing happens only core losses will be there on the transformer nothing will happen apart from that. If you go on increase the voltage core losses will increase and transformer will get heated up. After attaining the breakdown voltage of insulation, insulation in the primary and secondary will fail and the coils will get short circuited then the coils will burn.
No load current of transformer is non sinusoidal even though sinusoidal voltage is provided in oc sc test?
eddy current loss in the transformer core is reduced by
How do you minimize core losses?
Hysteresis and eddy current loss constitute core loss. It can be reduced by replacing solid core by laminated core... by adeeb
What is a card inside a notebook that converts voltage to CPU core voltage?
What is a card inside a notebook that converts voltage to CPU core voltage?
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.
Why us the power measured during the open circuit test considered to be approximately equal to the core loss?
During open circuit test on transformer, no load is connected across the secondary side. Hence, the total power drawn by the transformer is only to induce the voltage across the secondary, i.e., core loss AND negligible amount of primary copper loss. As the primary copper losses during open circuit are negligible, it is practice to attribute the open circuit power to core loss.
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.
