Identification of ions near HVDC (high-voltage direct-current) transmission lines: Final report
Positive and negative ion species were identified and studied at two separate field sites and one laboratory site. The first field study was conducted under an operating HVDC transmission line. The second was near a HVDC test line and measurements were performed with the line in both an energized and de-energized state. During clear, sunny days HSO/sub 4//sup /minus///center dot/H/sub 2/SO/sub 4/ was observed to be the dominant negative ion in the natural ion spectrum. At night, however, HSO/sub 4//sup /minus// core ions virtually disappeared, and were replaced by NO/sub 3//sup /minus// core ions and their first nitric acid cluster. Both negative spectra also typically contained lesser concentrations of the malonate ion. The transmission line negative spectra were similar but were typically dominated by the NO/sub 3//sup /minus// core ions during both day and night. The positive ions observed under HVDC lines were typically either NH/sub 4//sup +/ or C/sub 5/H/sub 6/N/sup +/, which reacted with higher proton affinity species (such as methylpyridines, trimethylamine and quinoline) farther from or in the absence of the transmission line. The observed differences between natural and anthropogenic ion spectra near HVDC lines are attributed primarily to a shortening of ion lifetimes by the strong electric field associated with the HVDC lines. One exception is the production of potassium and probably sodium based ions from the decomposition of insects in transmission line coronas. 22 refs., 29 figs.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (USA); Georgia Inst. of Tech., Atlanta (USA). Electromagnetics Lab.
- OSTI ID:
- 6043108
- Report Number(s):
- EPRI-EN-6391
- Country of Publication:
- United States
- Language:
- English
Similar Records
Study on reduction in electric field, charged voltage, ion current and ion density under HVDC transmission lines by parallel shield wires
Bipolar HVDC transmission-system study between +- 600 kV and +- 1200 kV: corona studies, Phase II
Related Subjects
CORONA DISCHARGES
BIOLOGICAL EFFECTS
IONS
PRODUCTION
ELECTRIC FIELDS
HVDC SYSTEMS
PROGRESS REPORT
QUANTITATIVE CHEMICAL ANALYSIS
CHARGED PARTICLES
CHEMICAL ANALYSIS
DC SYSTEMS
DOCUMENT TYPES
ELECTRIC DISCHARGES
ENERGY SYSTEMS
POWER SYSTEMS
560400* - Other Environmental Pollutant Effects