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This paper has proposed a time domain model of a fault locator with special reference to fault arc nonlinearities by applying the MODELS language of the EMTP. It has been found that an impedance relay type locator is significantly influenced by the fault arc nonlinearities, while the current diversion ratio method is not influenced. This validates the advantage of the current diversion approach over the impedance approach. Index Terms--ATP-EMTP, fault arc, fault locator, MODELS, time domain model.

Two new methods are proposed for fault point location in parallel double-circuit multi-terminal transmission lines by using voltages and currents information from CCVT's and CT's at all terminal. These algorithms take advantage of the fact that the sum of currents flowing into a fault section equals the sum of the currents at all terminals. Algorithm-1 employs an impedance calculation and Algorithm-2 employs the current diversion ratio method. Computer simulations are carried out and applications of the proposed methods are discussed. Both algorithms can be applied to all types of fault such as phase-to-ground and phase-to-phase faults. As one equation can be used for all types of fault, classification of fault types and selection of faulted phase are not required. Phase components of the line impedance are used directly, so compensation of unbalanced line impedance is not required. Index Terms--Fault location, Transmission line, Parallel double circuit, Multi-terminal.

Studies digital fault location for high resistance grounded electric power transmission lines. Importance of fault locators to support prompt recovery from transmission line fault; Effect of multiple load taps on single-phase-to-ground fault location; Fault location methods for parallel two-circuit two-terminal transmission lines.