DC Electric Field Effects During Measurements of Monopolar Charge Density and Net Space Charge Density near HVDC Power Lines

Abstract

The influence of a dc electric field on the measurement of monopolar charge densities using an aspirator-type ion counter and the measurement of net space charge density using a Faraday cage or filter is examined. Optimum configurations which minimize the effect of the electric field are identified for each type of instrumentation.

Calculation method of ion mobility spectrum for single‐measurement‐electrode Gerdien tubes

“…3. Substituting formula (3) into formula (10) yields the relation between the U sat and individual U 0i , as shown by following equation…”

“…Therefore, it is necessary to fit the I-U data pair firstly, and then obtain the current value at the voltage corresponding to the logarithmic mobility interval. Lastly, the ion mobility spectrum and the average ion mobility can be calculated by solving formula (7), (10), and (12) simultaneously.…”

“…The advantage of the ion counter method is that it can measure the ion density at different heights within a certain range. Some researchers have applied this method to the measurement of corona ion density [7,[9][10][11][12][13][14][15].…”