The tests were performed at STRI. A climate chamber
was used in order to control the air temperature and
humidity. The inner dimension of the climate chamber is
3050×2950×5000 mm (width × length × height). The test
voltage is connected into the climate chamber via a wall
bushing installed on the ceiling of the chamber.
Switching impulse of 400 kV can be applied through this
bushing to test objects inside the climate chamber. Fig.1
is the front view of the chamber.