A study of space charge measurement

•We developed a U-shaped cavity device to measure space charge.•We designed a kind of space charge generator for calibrating the U-shaped cavity charge measurement device.•The experiments have shown that U-shaped cavity device can measure space charge under transmission line at normally charged work condition.

At present, there is no appropriate measurement techniques for space charge. In this paper, a U-shaped cavity device is developed as the space charge measurement device, which can be applied to transmission lines. Its design principle and calculation techniques of design parameter are also introduced. To test the space charge measurement accuracy of the U-shaped cavity device, a space charge generator is developed specifically for this experiment. The test results are excellent and show that the U-shaped cavity device can meet the design requirements. This technique is suitable for space charge measurement under transmission line normally charged work condition.