2 TEST EQUIPMENT, SPECIMENS AND
PROCEDURE
2.1 TEST EQUIPMENT
The experimental investigations were carried out in the
multifunction artificial climate chamber with a diameter of
7.8 m and a height of 11.6 m, is shown in Figure 1. AC test
voltage is led to the specimen through a 330-kV wall
bushing. The test power was supplied with a
2000-kVA/500-kV pollution test transformer. The major
technical parameters are as follows: rated capacity 2000
kVA, rated current 4 A, input voltage 0-10.5 kV, output
voltage 0-500 kV, and short-circuit impedance less than 6
percent under a rated voltage of 500 kV. The capacity of test
transformer is satisfied with the requirement commended by
references [15-17].