What is the meaning of HVDC transmission line voltages?

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HVDC transmission line voltages, such as +/-500kV, indicate that one conductor operates at 500kV above ground while the other is at 500kV below ground, resulting in a total voltage difference of 1000kV between the two conductors. This configuration allows for efficient power transmission over long distances. An example from Clean Line Energy Partners illustrates that lines operating at ±500kV can transmit significant power, up to 3,100 MW. The discussion seeks clarification on the interpretation of these voltage designations. Understanding HVDC voltage levels is crucial for grasping their operational capabilities in power transmission systems.
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HVDC transmission line voltages are usually written as, for example., +/-500kV. Does this mean the voltage between the two conductors is 500kV, or does it mean that one conductor is 500kV above ground and the other is 500kV below ground, which would mean the voltage between the two is 1000kV? I've looked around on the internet, but haven't found the answer. Any help would be appreciated.
 
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Hi there
welcome to PF

AV8Electric said:
HVDC transmission line voltages are usually written as, for example., +/-500kV.

can you give an example or 2 of where you have seen this written please
it may help us guys put your comment into better context :smile:Dave
 
The following quote is from Clean Line Energy Partners web site. " Operating at ±500 kilovolts, the line is capable of transmitting up to 3,100 MW of power. In terms of operating voltage and capacity, the Pacific Intertie is similar to the Clean Line transmission line projects, which will operate at ±600 kilovolts and deliver up to 3,500 MW of power." Hope this helps.
 

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