The SWG 500 16 kV, 500 J surge wave generator operates in the middle voltage range of the usual SWGs. While its surge energy is in the lower range, you can switch between the three voltage ranges available (4 kV, 8 kV, and 16 kV), which allows each voltage stage to use the full surge energy of 500 Joules.
Together with reflectometers, surge wave generators are a central component of cable fault location and are used for both pre-locating and pinpointing faults.