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In power cable fault location the vast majority of pin-pointing and cable test are carried out using a surge wave tester.

It is a powerful equipment and offers 1000 Joules energy on 8, 16 and 32 kV ranges, and DC high voltage (High-Pot) test which allows its use on LT, Medium and HT networks effectively.

It is also used to pin-point the cable faults in power cables with the help of surge wave receiver and pre-locate cable fault distance with the help of suitable pre-locator unit in Impulse Current (ICM) mode. It can couple to an arc reflection filter to pre-locate faults in Secondary Impulse (SIM) Mode.

It is used to pin-point underground cable faults in acoustic mode with the help of suitable surge wave receiver and to perform DC high voltage di-electric test up to 32 kV in power transmission and distribution cable networks.

In surge mode ignites an arc or spark at the fault. This results in a transient, i.e. a spreading and repeatedly reflected traveling wave between the fault point and the connected end of HV Surge Tester. Inductive couplers record this transient wave with the help of a pre-locator unit and convert it into the fault distance.

Surges of high energy are applied to the fault at the set voltage and time interval for pin-pointing the exact spot on the cable length. These surges create noise and vibrations at the fault point. The intensity of the noise and vibrations get attenuated during their travel to the ground surface. A sensitive surge wave receiver with ground microphone carried out on the cable route at the pre-located area and pin-point the exact spot of the fault in minimum time.

The high voltage DC test up to 32 kV is carried out to check the di-electric strength or insulation of cable on DC test mode. The respective voltage and leakage current is indicated on the meters.

The HV Surge Tester used for fault pin-point location is basically a variable DC high voltage power supply, connected to a high voltage capacitor bank. The value of capacitance is usually selectable by parallel, series - parallel and series combination. This combination being linked with suitable high voltage taping to give the constant energy output on low voltage / high capacitance or high voltage / low capacitance in surge mode. In DC test mode the internal capacitor bank is isolated through a mode selection switch and DC high voltage is applied to the cable under test through a spark discharge device.