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Space charge drift from a +/- 400-kV direct current transmission line
Bioelectromagnetics
|January 1, 1986
Summary
A 3-year study found that space charge plumes from bipolar direct current (DC) transmission lines extend at least 1600 meters. These plumes, containing charged aerosols and ions, affect air quality near transmission lines.
Area of Science:
- Environmental Science
- Atmospheric Physics
- Electrical Engineering
Background:
- High-voltage direct current (HVDC) transmission lines generate electric fields.
- Understanding the environmental impact of these fields is crucial for public health and safety.
Purpose of the Study:
- To quantify the extent and characteristics of space charge plumes from bipolar HVDC transmission lines.
- To assess potential human and animal exposure to electric fields and charged particles.
Main Methods:
- Field study conducted over 3 years in rural Minnesota.
- Measurements of DC potential gradient and small air ion concentrations.
- Analysis of plume relaxation rates and polar conductivity.
Main Results:
- Space charge plumes are detectable up to 1600 meters downwind.
- Plume characteristics depend on transmission line polarity and wind conditions.
- Charge imbalance, with elevated ions of one polarity and suppressed ions of the opposite, persists for at least 1600 meters.
Conclusions:
- Bipolar DC transmission lines create distinct space charge plumes with measurable effects on the local atmosphere.
- The study provides critical data on the environmental reach of HVDC transmission line space charges.