变压器课件(英文)ABB Presentation

Power enter through bushings at a certain voltage
Coolers to dissipate the heat.
Inside the tank are the windings and core
Conservator to allow expansion of insulating oil.
Power (MVA) = Sqrt3 x Voltage (kV) x Current (A) Thus the current is given indirectly!
A small part of the energy will leave the transformer as heat.
100% POWER
surroundings a magnetic field. 2) A varying magnetic field will cause a voltage to appear on a
Why Power Transformers?
With Transformers men can produce, transport and distribute electricity at the most convenient (economical!) Voltages.
A transformer is a component that receives power at one voltage and delivers virtually the same power at another voltage.
99.7% POWER
VOLTAGE 1
VOLTAGE 2
Ex: 100 MVA and 230 kV gives 251 A
Ex: 100 MVA and 23 kV gives 2510 A
A transformer may operate with the power flowing in any direction.
Basic physics The Transformer
The main transformer input is one voltage and the power. The main transformer output is another voltage and virtually the same power.
Virtually all existing power transformers were made for 3-phase systems.
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Three Phase Symetrical Voltage
1.T5 hree Phase Systems
6.67 ms
6.67 ms
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Basic physics
Generator Step-Up transformers
System transformers
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Basic Physics Components Active Part Cost Drivers Testing Order execution Manufacturing process Packing and shipping Quality Applications
The Transformer
Tap Changer to regulate output voltage
Basic physics Three Phase Systems
Varying voltages and currents means in time varying power. To obtain reduced power variation it is much better to generate and consume electric energy using 3 phases rather than just one.
6.67 ms
Voltage
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3 Low Voltage Bushings
3 High Voltage Bushings
Power Transformers
The Vital component in Power Systems
1-
Content
Basic Physics Components Active Part Cost Drivers Testing Order execution Manufacturing process Packing and shipping Quality Applications
Plus possible grounding bushings and/or test bushings
Three Phase Transformer
6 or more bushings.
Basic physics Main physical principle
What makes the transformer possible are two physical facts: 1) A current flowing through a conductor will create on its