What's the Difference Between 13.8kV and 14.4kV for Higher Voltage Equipment?

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The discussion clarifies the differences between 13.8kV and 14.4kV in the context of higher voltage equipment. It emphasizes that the choice of voltage impacts the performance of components such as resistors and capacitors. Specifically, using a 10kW resistor rated at 14.4kV on a 13.8kV supply will not yield the expected power output. Additionally, when selecting capacitors for power factor correction, the voltage rating must align with the system voltage to ensure proper reactive power calculations.

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  • Understanding of electrical power ratings and impedance
  • Familiarity with reactive power and power factor correction
  • Knowledge of voltage ratings for electrical components
  • Basic principles of electrical engineering related to higher voltages
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Electrical engineers, equipment vendors, and technicians working with higher voltage systems, particularly those involved in power factor correction and equipment specification.

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New to "higher" voltage

Hi all, new to the site and I'm looking for a little guidance.
I'm new to working with higher voltages (kV) and I am wondering what the difference is between using 13.8kV and 14.4kV. I'm dealing with some equipment vendors and one has specified 13.8kV while the other used 14.4kV.
Other than the obvious, what am I missing.

Thanks!
 
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Well it all depends on what you are trying to buy. For instance if you want to buy capacitors to improve your power factor, then yes the voltage matters.

Simply put, take for instance a 100W Edison light bulb. The power rating on the bulb is for a certain voltage, say 240V. if you connect this 100W on 120V, will it produce 100W of light (and heat)? No. It will produce only 25W, because the constant here is the impedance (resistance) of the bulb. The same reasoning applies to for instance a 10kW@14.4kV resistor. If you connect this resistor on 13.8kV, you won't get 10kW. The reasoning also applies to capacitors. If you need for instance 25 kvar of capacitors to improve your power factor and some vendors have 25 kvar @ 13.8kV and some others have 25 kvar @ 14.4kV, you need to be careful to calculate the amount of reactive power you need depending on your voltage.

Hope this helps
 

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