When the values of resistance are to be placed in a percentage format, both transformer reactance as well as level of equivalent resistance is to be placed in a percentage manner.
The percentage resistance is maintained by drop in resistance level by volts in comparison to a frequency that is taken at a rated voltage percentage level.
To answer the query as to why both these formats are expressed in percentage format – with both reactance and resistance expressing themselves in percentage mode, chances are there that both will have similar values. In case they are expressed in ohms, irrespective of secondary or primary areas, values found are different from each other.
Since current levels that will be flowed within the transformers will be dependent on impedances and percent reactance. This happens when secondary format is shorted in an accidental manner.
It is to be noted that only if transformer is minimal in size, the level of equivalent resistance is minute and amount of percent reactance can be replaced by impedance percent amount. Also, for getting a detailed view, you can surely make use of per unit values.
Hence, in most cases, these are expressed in percentage format.
Links of Previous Main Topic:-
- Current Electricity Basic Concepts
- Introduction to Alternating Current
- Introduction Three Phase A C Circuits
- Magnetic Field
- General Aspects
- Elementary Theory of Ideal Transformer
- E M F Equation of a Transformer
Links of Next Electrical Engineering Topics:-
- Voltage Transformation Ratio K
- Transformer with Losses but No Magnetic Leakage
- Resistance and Magnetic Leakage
- Transformer with Resistance and Leakage Reactance
- Equivalent Resistance and Reactance
- Total Voltage Drop in a Transformer
- Equivalent Circuit
- Transformer Tests
- Regulation of a Transformer
- Percentage Resistance and Reactance
- Transformer Losses
- Transformer Efficiency
- All Day Efficiency
- Transformer Noise
- Auto Transformer
- Polarity of Transformers
- General Aspects Polyphase Induction Motors
- Single Phase Motors
- Characteristics of D C Generators
- Measuring Instruments
- Power Supply System