Powerline cable count and engineering question (HV power distribution lines)

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Discussion Overview

The discussion centers around the engineering and operational aspects of high voltage power distribution lines, specifically focusing on the configuration of conductors in 110 kV and 330 kV transmission lines, the rationale behind having multiple voltage lines on the same structures, and the implications for power distribution to different types of consumers.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants propose that the presence of seven wires (three phases, two for each phase, and a neutral) may be for increasing current capacity, while others suggest that typically only three phase conductors are needed for transmission lines, with a shield wire for lightning protection.
  • There is mention of bundled conductors being used to increase current capacity and reduce corona losses, as well as the use of double circuit towers to save space.
  • One participant questions the design of substations, noting that the 330 kV line appears to be interrupted at the substation, which raises questions about how power is supplied to local areas and the role of circuit breakers.
  • Another participant discusses the absence of a neutral conductor in high voltage lines, explaining that three-phase power does not require one, as the phases can balance out.
  • There is speculation about the rationale for maintaining both 110 kV and 330 kV lines, with suggestions that they may serve different types of loads, such as industrial versus residential consumers.
  • Some participants express uncertainty about the coexistence of different voltage lines on the same structures, questioning whether this is typical practice and seeking references to support claims.

Areas of Agreement / Disagreement

Participants express a mix of agreement and disagreement regarding the technical aspects of high voltage lines, with no clear consensus on the reasons for having both 110 kV and 330 kV lines on the same structures or the necessity of neutral conductors in transmission lines.

Contextual Notes

There are unresolved questions regarding the specific configurations of the lines, the operational design of substations, and the implications for power distribution, which depend on various assumptions and definitions that are not fully explored in the discussion.

  • #31
Baluncore said:
Power line engineering is a complicated compromise, it is hard to guess what parameters were most important during the design.

Well said, and nearly complete list of design considerations.
 
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  • #32
I think the word compromise, has been vilified, and particularly to some more idealistic engineering types. One way to see this is an equation, with many possible solutions - and the best one(s) include many variables ( arguments).
 

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