Summary
Accurate fault location in hybrid transmission corridors combining overhead lines (OHL) and underground cables (UGC) represents a critical challenge for power system reliability. The industry-standard Takagi algorithm, in phase to ground failures, relies on a constant zerosequence compensation factor 𝑘 that is inadequate for representing the non-homogeneous nature of these mixed circuits, frequently leading to faulted section misidentification. This contribution presents a single-ended fault location method for single phase-to-ground faults that incorporates a dynamic, distance-dependent compensation factor 𝑘(𝑥). The algorithm iteratively evaluates the cumulative sequence impedances along the route, automatically adapting to the specific characteristics of each segment (whether OHL, UGC, or cross-bonded cable systems) ensuring a physically consistent representation of the distributed system without requiring additional communication infrastructure.
Read more Read lessThe method has been implemented in an operationally oriented software tool integrated with
COMTRADE records and corridor parameter databases. Validation on high-voltage field cases demonstrates significant accuracy improvements over constant-k approaches. Synthetic simulations confirm low error under radial operating conditions, independent of fault resistance, and a sensitivity analysis identifies OHL section reactance as the dominant parameter influence.
By enhancing precision in cable sections and transitions, this approach supports faster fault clearance and improves operational reliability for utilities managing complex interconnected corridors.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B1_11613_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Argentine Republic |
| Study committees | |
| File size | 916 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
ENCISO Luciano - EDENOR SA
