Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Air ion mobility spectra and concentrations upwind and downwind of overhead AC high voltage power lines
https://orcid.org/0000-0003-0550-6134
https://orcid.org/0000-0002-5908-0610
Abstract Corona ions produced by high-voltage power lines (HVPLs) can alter the nearby electrical environment, potentially increasing aerosol charge levels downwind. However, there is a lack of knowledge concerning the concentration and mobility of ions from AC HVPLs and their dispersion away from the line. We present ion concentration and mobility measurements made near AC HVPLs in South-West England. Examples of typical mobility spectra are shown highlighting features commonly observed. Corona was observed during 33 of 46 measurements, at 9 of 11 sites, with positive or ‘bipolar’ (both polarities) ion production commonly seen. Ion production usually increases atmospheric concentrations by only a modest amount, but extreme cases can enhance concentration by an order of magnitude or more. A polarity imbalance is required to increase aerosol charge via ion attachment; this was observed on 15 of 24 days when positive corona was observed, but was not seen for negative ions. Ion mobility was higher downwind compared with upwind for both ion polarities, but the increase was not statistically significant. Future work should focus on identifying and characterising ‘heavy-producing’ HVPLs, and obtaining results in conditions which may favour negative ion production e.g. high humidity, inclement weather or during nighttime.
Graphical abstract Display Omitted
Highlights Air ion concentration and mobility measurements near AC high voltage power lines. Corona observed during 33 of 46 measurements, at 9 of 11 sites. Bipolar (both polarities) and positive ion production observed most frequently. Polarity imbalance observed for positive (15 of 24 days) but not negative ions. Particular line configurations shown to be ‘heavy producers’ of corona ions.
Air ion mobility spectra and concentrations upwind and downwind of overhead AC high voltage power lines
https://orcid.org/0000-0003-0550-6134
https://orcid.org/0000-0002-5908-0610
Abstract Corona ions produced by high-voltage power lines (HVPLs) can alter the nearby electrical environment, potentially increasing aerosol charge levels downwind. However, there is a lack of knowledge concerning the concentration and mobility of ions from AC HVPLs and their dispersion away from the line. We present ion concentration and mobility measurements made near AC HVPLs in South-West England. Examples of typical mobility spectra are shown highlighting features commonly observed. Corona was observed during 33 of 46 measurements, at 9 of 11 sites, with positive or ‘bipolar’ (both polarities) ion production commonly seen. Ion production usually increases atmospheric concentrations by only a modest amount, but extreme cases can enhance concentration by an order of magnitude or more. A polarity imbalance is required to increase aerosol charge via ion attachment; this was observed on 15 of 24 days when positive corona was observed, but was not seen for negative ions. Ion mobility was higher downwind compared with upwind for both ion polarities, but the increase was not statistically significant. Future work should focus on identifying and characterising ‘heavy-producing’ HVPLs, and obtaining results in conditions which may favour negative ion production e.g. high humidity, inclement weather or during nighttime.
Graphical abstract Display Omitted
Highlights Air ion concentration and mobility measurements near AC high voltage power lines. Corona observed during 33 of 46 measurements, at 9 of 11 sites. Bipolar (both polarities) and positive ion production observed most frequently. Polarity imbalance observed for positive (15 of 24 days) but not negative ions. Particular line configurations shown to be ‘heavy producers’ of corona ions.
Air ion mobility spectra and concentrations upwind and downwind of overhead AC high voltage power lines
https://orcid.org/0000-0003-0550-6134
https://orcid.org/0000-0002-5908-0610
Abstract Corona ions produced by high-voltage power lines (HVPLs) can alter the nearby electrical environment, potentially increasing aerosol charge levels downwind. However, there is a lack of knowledge concerning the concentration and mobility of ions from AC HVPLs and their dispersion away from the line. We present ion concentration and mobility measurements made near AC HVPLs in South-West England. Examples of typical mobility spectra are shown highlighting features commonly observed. Corona was observed during 33 of 46 measurements, at 9 of 11 sites, with positive or ‘bipolar’ (both polarities) ion production commonly seen. Ion production usually increases atmospheric concentrations by only a modest amount, but extreme cases can enhance concentration by an order of magnitude or more. A polarity imbalance is required to increase aerosol charge via ion attachment; this was observed on 15 of 24 days when positive corona was observed, but was not seen for negative ions. Ion mobility was higher downwind compared with upwind for both ion polarities, but the increase was not statistically significant. Future work should focus on identifying and characterising ‘heavy-producing’ HVPLs, and obtaining results in conditions which may favour negative ion production e.g. high humidity, inclement weather or during nighttime.
Graphical abstract Display Omitted
Highlights Air ion concentration and mobility measurements near AC high voltage power lines. Corona observed during 33 of 46 measurements, at 9 of 11 sites. Bipolar (both polarities) and positive ion production observed most frequently. Polarity imbalance observed for positive (15 of 24 days) but not negative ions. Particular line configurations shown to be ‘heavy producers’ of corona ions.
Air ion mobility spectra and concentrations upwind and downwind of overhead AC high voltage power lines
Wright, Matthew D. (Autor:in) / Buckley, Alison J. (Autor:in) / Matthews, James C. (Autor:in) / Shallcross, Dudley E. (Autor:in) / Henshaw, Denis L. (Autor:in)
Atmospheric Environment ; 95 ; 296-304
21.06.2014
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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