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Transformers are used to step up and down voltages. The amount of this step is directly proportional to the turns ratio from one winding to the other. Using circular coils means a minimum amount of copper can be used, since the number of coils is relatively fixed by the voltage levels involved.
Another reason is corners are not a good idea when dealing with really high voltages - they can result in eddy currents, strange flux paths, corona, and localized heating to name a few problems.
Wiki User
∙ 13y ago
Wiki User
∙ 10y agoBecause the laminations are rectangular.
AnswerThis might be true for small transformers, but for power and distribution transformers their windings are rarelyrectangular; most are circular, being wound on insulated tubes. To achieve this, most larger transformers have laminations whose sizes are graduated to give an approximately circular cross-section.
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Why grease is used in electrical transformers?
Grease is not used in transformers. An insulation oil is used to circulate around the internal coils to dissipate the heat generated when the transformer is in operation. Thermo syphon principals are used. Warm oil moves to the top of the transformer case and is displaced by cooler oil moving to the bottom creating a flow in the oil and there by aiding in the cooling of the coils. Transformers in larger sizes have cooling fins or tubes through which the oil flows to give more surface area to dissipate the internal coil heat. Smaller size transformers use the oil contact with the oil containment shell of the transformer to dissipate the heat.
Why desiel is used in transformers?
Transformers use transformer oil as an insulator and to conduct the heat away from the windings. The oil usually flows through a radiator in a closed circuit on high-power transformers.
What allows simple transformers to step up or down?
The voltage ratio in transformers used in power supply is set by the ratio of the number of turns on the primary and secondary windings.
What is zero pcb?
It's Basic Project Of Transmitter & Receiver circuit <<>> Poly-chlorinated-biphenyls, it is a oil used in transformers to dissipate the heat from the coils of the transformer to the transformer's case. This helps in the transformers cooling. The only problem, it was found out after many years of use that it is toxic to the environment. Zero PCB's is the terminology used for the new transformer oils that are not PCB based.
Is the wire coil in a transformer made of an alloy?
Most transformers have coils made of pure copper. This copper is really pure, and it is not an alloy.Certainly we know of situations where other materials are used to wind the cores of transformers. In superconcuctive matnets, the coils are alloys or composite materials that have specific superconductive properties. And don't forget the coils in the calutrons used at Oak Ridge National Laboratory to enhance uranium diring World War 2. They were made of silver that was borrowed by the ton from reserves at Fort Knox!By and large, most transformers we encounter will be wound with pure copper wire. It might be worth noting that recycled copper is not generally used to make copper wire as it is not pure enough. Virgin copper is generally the best choice for electrical wire, and recycled copper works very well for copper pipes and copper tubing.
What are the advantages of power transformers over voltage transformers?
Power transformers can be used for power transformation. Voltage transformers are not suitable for high power applications.
Distribution transformer vs power transformer?
Power transformers are step-up or step-down transformers used in the electricity transmission system, whereas distribution transformers are step-down transformers used in the electricity distribution system.
Why ac current is used in a transformer?
AC current or DC current can be used in transformers. A transformer is made of two coils of wire, the input coil induces a current into the output coil. Transformers change the voltage either up (step up transformer) or down (step down transformer). The amount of change in voltage is dependent solely on the number of windings in both coils in the transformer. DC transformers work exactly the same way AC transformers do.
Application of instrument transformer in power system?
Instrumental transformers are potential transformers and current transformers,they are used to measuring and protecting purposes at power systems
What is tie transformer?
It is a step down transformer which is used to supply the electrical power to the station transformers and the colony transformers
What are the uses of solenoid?
Solenoids are coils of wire that create a magnetic field when an electric current passes through it. These are used in the alternator of a car to create electricity. Solenoids are also used in generators to create electricity in power stations and in transformers to change the voltage of an AC current.
Why auto transformers are not used directly on dc circuits?
Transformers are not used on DC circuits because they rely on a varying magnetic field to transform power.
Why grease is used in electrical transformers?
Grease is not used in transformers. An insulation oil is used to circulate around the internal coils to dissipate the heat generated when the transformer is in operation. Thermo syphon principals are used. Warm oil moves to the top of the transformer case and is displaced by cooler oil moving to the bottom creating a flow in the oil and there by aiding in the cooling of the coils. Transformers in larger sizes have cooling fins or tubes through which the oil flows to give more surface area to dissipate the internal coil heat. Smaller size transformers use the oil contact with the oil containment shell of the transformer to dissipate the heat.
Is varnish a good conductor of electricity?
No. In fact it is used as an insulator.The copper wire, used in transformers and other similar wound coils, are coated in varnish, to act as an insulator between each wire.
What are the applications of autotransformer?
Power transformers may be step-up or step-down. Distribution transformers are step-down. Isolation transformers are 1:1 ration transformers. Matching transformers are used in electronic circuits for impedence matching purposes. Instrument transformers are used to measure high-voltage voltages and currents or to operate protective systems.
Why are transformer used with power tools?
Transformers are used with tools that operate on less than 'mains' voltage.
Why desiel is used in transformers?
Transformers use transformer oil as an insulator and to conduct the heat away from the windings. The oil usually flows through a radiator in a closed circuit on high-power transformers.
