(b)
From left to right:
高压试验变压器：
High-voltage test transformer
硅堆：
Silicon stack
电容：
Capacitance
球隙：
Ball-gap
声音强度：
Sound intensity
距离：
Distance
电缆：
Cable
Find out the point of fault using location instrument, is usually performed on the
basis of performing rough measurement using flash tester, and has identified the
approximate distance, and cable path has been completed. On one hand, input impact
high-voltage to cable to make it flashover discharge. On the other hand, listen with a
location instrument probe audio meter along the cable path on the estimated location
of the fault. After hearing the sound of the point of fault discharge, you still need to
find out the biggest sounding place along the cable path. Just find the loudest point;
dig the soil layer will be it. That is generally right, unless the sound is spread from the
cable through the tube, calandria tubes, witch causes errors.
In the actual test using impulse discharge acoustic method, it usually increases
the difficulty to identify due to the interference of ambient noise. This requires
capacitor discharge equipment can produce steady periodic, powerful discharge pulse,
so that people can distinguish the difference between the ambient noise glitch
