Allowable Voltage Drop Percentage

Posted: October 1, 2011 in Electrical Engineering

According to Petronas Technical Standards (PTS), the allowable voltage drop percentage from the main power supply to the end load is capped at 5%. In our design, we need to make sure this condition is met.

In formulating the best allowable voltage drop at each feeder and loads, we also need to consider the power supply that comes from the battery terminal when power obstruction occurs. The percentage of allowable voltage drop from the battery to the end load also needs to be 5%.

Below is the simple single line example I had made for the project I’m assigned too. This helps to deepen my understanding and help me to have a quick overview of the allowable voltage drop percentage in the system.

Initially you could assume the allowable voltage drop at each feeder and loads by putting a rough figure. Then, from your cable sizing calculation you can then alter them accordingly to obtain the best result. Usually, your concern is to use the smallest cable possible in every design.

Smaller cable = Less cost = More profit! 😉

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