Cable's Insulation Fault Location
Pre location of cable’s insulation fault.
Methods of pre location
Murray and Glasser Bridge method
Pulse reflection method
Impulse current method
Secondary Impulse Method (Arc reflection)
TDR graph (secondary impulse method)
Pin-point location of cable insulation fault
Methods of pin point location
Twist method
Acoustic method
Cable's Sheath Fault
Pre location of cable’s sheath fault.
Methods of pre location
Murray and Glasser Bridge method
Murray Bridge Method
Pin-point location of cable sheath fault
Methods of pin point location
Step Voltage method
The flow of pulsed DC voltages through the impedance of the earth fault creates slight DC voltage differences along the cable path. The effect is strongest exactly over the fault and can be detected by the use of two earth spikes and a very sensitive voltmeter – locator. If the fault is in the middle between the two earth spikes, the voltage difference is zero.
