cable impedance
- Thread starter louie
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- Lockport, IL
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- Semi-Retired Electrical Engineer
Re: cable impedance
There are four principal units of measure for which ?per unit? quantities are used in power system analyses. They are voltage, current, impedance, and power. You are free to select any two of these, and to choose any value you wish for their base values. The remaining two base quantities can then be calculated from the values that you had chosen. So pick whatever you like. How about 42 volts for base voltage, and 0.1349308 VA for base power?
The most common choices are to select power and voltage as the base quantities. The value of base power is generally chosen to be the rated power of the service transformer. The value of base voltage is generally chosen to be the secondary side line-to-line voltage of that transformer. So perhaps one good choice for your base voltage would be 600 volts. But I wanted it understood that it is a design choice, the prerogative of the analyst, and that there are no wrong choices.
There are four principal units of measure for which ?per unit? quantities are used in power system analyses. They are voltage, current, impedance, and power. You are free to select any two of these, and to choose any value you wish for their base values. The remaining two base quantities can then be calculated from the values that you had chosen. So pick whatever you like. How about 42 volts for base voltage, and 0.1349308 VA for base power?
The most common choices are to select power and voltage as the base quantities. The value of base power is generally chosen to be the rated power of the service transformer. The value of base voltage is generally chosen to be the secondary side line-to-line voltage of that transformer. So perhaps one good choice for your base voltage would be 600 volts. But I wanted it understood that it is a design choice, the prerogative of the analyst, and that there are no wrong choices.
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