Q: How is the underground cable fault detection done?
A: Underground cable fault detection is done using cable voltage drop as an input and resistance at every kilometer is the consideration.
Q: How is the fault detected?
A: Cable length represented by a set of resistors is subjected to a current flow through a series resistor, the voltage drop of which is used in the programming through in-built ADC to calculate the distance.
Q: What are the types of fault created in this system?
A: Three Line to Ground, three Line-to-Lines and line to line are the types of faults created in this system.
Q: Which microcontroller is used in this project?
A: Arduino development board with ATMega328 microcontroller is used in this project.
Q: From any digital energy meter internal circuit that delivers one pulse per a certain fraction of one unit is taken from its blinking LED points.
A: Using Arduino is easier as one can avoid assembly of a microcontroller circuit with ADC etc.
Q: What is the formula for calculating smoothing capacitor value?
A: There is some approximated formula .Peak to peak ripple voltage = Load current in amps / (2*line frequency in hertz *capacitance in farads). But as rule of thumb for 1 A current 1000uF is best. Thus it is load dependent.