High Voltage Surge Tester SWT 16 is useful equipment for to pin-point underground power cable fault by acoustic method with a suitable surge receiver. In power cable fault location most of majority faults pin-points test are carried out using a high voltage and high energy surge wave tester. It offers 500 Joules of energy on 4, 8 and 16 kV selectable ranges, which is use on low and medium voltage cable networks effectively. It is also used to pre-locate cable fault distance with the help of suitable pre-locator unit in impulse current (ICM) mode.