Study of electric field and ion effects on HVDC lines: Technical progress report No. 10

A description of the size-charge equipment and the basic theory of charged aerosol motion has been presented in previous Technical Progress reports. This report provides a more detailed look at the device and an explanation of the modifications made to develop the instrument to its present state. A number of measurements were made under various conditions to calibrate the instrument package, check its reliability and repeatability, and to perform a preliminary investigation into the characterization of the size-charge distribution of aerosols downwind from HVDC transmission lines. This report also presents results of measurements of the space charge above ground near the DC Pacific Intertie at the Bonneville Power Administration's DC test site near Grizzly Mountain in central Oregon. The measurements were made with a space charge cage carried aloft by helium balloons.