As you said, equivalent positive and negative phase seq. networks can be placed in parallel when considering this fault. However, this doesn't produce a series circuit of all the impedances fed by emf "e" since currents in different parts of new network are generally different (i1≠i2≠if).BTW, if you calculate in p.u. system, all voltages,currents,impedances must be in p.u., and denoted in small letters. I have modified your schematic accordingly:Physicist3 said:
A Line Fault Circuit is a type of electrical circuit that is designed to detect and respond to faults or abnormalities in the power supply line. It is used to protect electrical equipment and prevent damage from power surges or fluctuations.
A Line Fault Circuit works by constantly monitoring the voltage and current levels in the power supply line. If there is a sudden increase or decrease in these levels, it triggers the circuit to shut off the power supply, preventing any damage to connected equipment.
The main components of a Line Fault Circuit include a voltage and current sensor, a comparator, a relay, and a control unit. These work together to detect and respond to any faults in the power supply line.
A Line Fault Circuit should be used whenever there is a risk of power surges or fluctuations that could damage electrical equipment. This includes in industrial settings, in homes with sensitive electronics, and in areas with unreliable power grids.
A Line Fault Circuit and a circuit breaker both protect electrical equipment, but they work in different ways. A circuit breaker is designed to trip when there is an overload or short circuit, while a Line Fault Circuit responds to changes in voltage and current levels. Additionally, a circuit breaker can be manually reset, while a Line Fault Circuit typically resets automatically.