Fault impedance estimation algorithm for digital distance relaying

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/61.311165· OSTI ID:7230406

Waikar, D L ^[1]; Elangovan, S; Liew, A C ^[2]

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1. Singapore Polytechnic (Singapore). Dept. of Electrical Engineering
2. National Univ. of Singapore (Singapore). Dept. of Electrical Engineering

Fault impedance is one of the major parameters that must be estimated accurately in digital distance relaying application. In this paper, a new algorithm is proposed based on symmetrical components theory. The proposed algorithm has computational advantage over previously suggested symmetrical components based algorithms. A procedure for applying shunt fault conditions to the sequence equations to estimate fault impedance of the protected transmission line is discussed. Alternative Transient Program (ATP) that is available on personal computers was used in evaluating the proposed algorithm. ATP models a power system and simulates many fault conditions on a selected transmission line. Fault data obtained were used in calculating fault impedance using the proposed algorithm. Fault impedance estimates were inserted in relay characteristics to determine suitability of the proposed algorithm for first zone distance protection. Sample results of these studies which show stable fault distance estimates are presented and discussed in the paper.

• OSTI ID: 7230406
• Journal Information: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States) Vol. 9:3; ISSN 0885-8977; ISSN ITPDE5
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240201* -- Power System Networks
Transmission & Distribution-- AC Systems-- (1990-)
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
ELECTRIC IMPEDANCE
ELECTRICAL EQUIPMENT
ELECTRICAL FAULTS
ENERGY SYSTEMS
EQUIPMENT
IMPEDANCE
ON-LINE CONTROL SYSTEMS
ON-LINE SYSTEMS
POWER SYSTEMS
POWER TRANSMISSION LINES
RELAYS