Distribution of Ground Fault Currents Along Transmission Lines -- An Improved Algorithm
The calculation of fault current distribution between ground wires and ground is important for the operation of modern power systems. A new method is presented based on an approach whereby the current distribution is solved through the computation of driving-point impedances. The method is applied to three phase systems with mutual couplings between conductors (phase and ground, respectively) included. Currents computed by this method and methods published in recent literature are compared and are found in good agreement. Results show that the method is more efficient in terms of CPU time and memory space.
Ground Fault Current Distribution Between Soil and Neutral Conductors
When a phase-to-ground fault occurs on a grounded power network, the current returns to the generating sources through the soil and the neutral conductors. The magnitude of the fault current and its distribution in soil and neutral conductors are of prime importance to, design safe grounding installations, calculate accurately electromagnetic induction on neighbouring circuits and determine the optimum setting of the protective relays.
Determination of induced currents and voltages in earth wires during faults
The multiconductor analysis introduced to the study of the current and voltage distributions of power-transmission lines of any configuration may account for the induced currents and voltages in earth wires at any point of interest along a transmission line under normal or fault conditions at any operating voltage levels. The earth wires are employed as individual entities in the analysis along with the line conductors. Huge currents and high voltages are to be induced in earth wires during the occurrence of a fault in the line conductors in extra-high-voltage transmission lines of power frequency. From the safety and reliability point of view, the prediction of induced currents and voltages in earth wires under the fault conditions of the line conductors is significant and important for those power-transmission lines operated at high-voltage or extra-high-voltage levels.