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A voltage transformer (VT) is used on alternating current (AC) systems to provide a standardised equivalent or representatative voltage compared to that of a higher voltage (HV) primary system.
At low voltage, e.g. the household 400/230v power supply systems, it is safe and simple enough to measure the voltage directly with a voltmeter or other instrument requiring the voltage information. At high voltages, e.g. greater than 1000v, it is no longer safe to do a direct measurement, thus voltage Transformers are used to provide isolation from the high voltage and give a secondary output proportional to the high voltage. For example, an 11kV supply system will typically use an 11kV / 110v voltage transformer to give secondary voltage of 110v which is 100 times smaller than the supply voltage. (the complexity of three phase systems is not covered here)
By measuring this secondary VT voltage and multiplying by 100, a person will have the value of the 11kV supply voltage.
Transformers all have errors/losses, including VTs, thus the VT is specifically designed to international standards, such as IEC 60044, to provide a small but acceptable error of measurement. The design allows for a small measurement load and is not intened to supply power to large loads.
A: Its function is to modify the input to some other output to be useful minus quite of bit of power loss at full load. I also provide isolation from the source and can provide impedance matching for maximum power transfer
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∙ 13y ago
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Is there possible the transformer can operate below the rated voltage?
A: Transformers are designed for the maximum voltage they can sustain in operation a lower voltage operation should not bother them
What the effect of switch on the no load transformer?
specially for high voltage operation
What is the purpose of constant voltage transformer?
The term 'constant voltage transformer' is used to differentiate the operation of transformers that are intended to change voltage levels, from those intended to change current levels -a current transformer (CT), for example, is termed a 'constant current transformer'.
What is the operation of a transformer?
A transformer is a static device which is used to step up or step down the voltage in a powered circuit.
What are operation of single-phase transformer?
To stept up or step down the voltage of transmisson of electricity.
What are the condition for transformer parallel operation?
CONDITIONS REQUIRED FOR TRANSFORMER PARALLEL operation are.. 1. Voltage turn ratio. 2. phase sequence 3. Impedence should be same 4. polarity Hitesh
What is no load tap changing in transformer?
It changes the tap while it is operation (hence "on load"). This allows real-time voltage regulation for the transformer secondary (as load picks up, causing the voltage to sag, the LTC can tap up, increasing the voltage).
What is a transformer that increases voltage?
A transformer that increases voltage is a step-up transformer.
How do you make 2v transformer in to a 9v transformer?
In reality there's no way to do that that'd make sense. In theory you could rewind the 2nd winding to get a higher voltage.
The incoming voltage from the current source to the transformer is called what?
The incoming voltage from the source to the transformer is called primary voltage.
What is the main different between the power transformer and voltage transformer?
Voltage Tarnsformer transforms only voltage. While power transformer transforms both voltage and current.
When is a step up transformer used in relationship as to when a step down transformer is used?
If the voltage needs to be increased from a lower voltage to a higher voltage a step up transformer is used. If the voltage needs to be lowered from a higher voltage to a lower voltage a step down transformer is used.
