Kalman filter based incipient fault detection method for underground cables

Teymoor Ghanbari

Kalman filter based incipient fault detection method for underground cables

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Author(s): Teymoor Ghanbari ¹
- Affiliations: 1: School of Advanced Technologies, Shiraz University, Shiraz, Iran
Source: Volume 9, Issue 14, 05 November 2015, p. 1988 – 1997
DOI: 10.1049/iet-gtd.2015.0040 , Print ISSN 1751-8687, Online ISSN 1751-8695

Received 07/06/2014, Accepted 08/06/2015, Revised 28/04/2015, Published 05/11/2015

An incipient and self-clearing arcing fault can be utilised as a precursor of an imminent permanent failure for monitoring of underground cables. Due to very short duration of the incipient faults, generally they cannot be detected by conventional protection relays. This study presents a new method for detection of incipient cable failures by using measured current and voltage at one end of the cable. The incipient faults are detected using an innovation signal calculated from the measured fault current via a Kalman filter. Upon change detection by the innovation signal, the change is checked for discriminating possible incipient fault from other similar conditions. The proposed method is evaluated using several simulations and field data collected from a real network. The results confirm that the method can achieve high accuracy and speed for detection of cables incipient faults.

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