A fundamental digital approach to impedance relays

Journal Article · Thu Oct 01 00:00:00 EDT 1992 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/61.156988· OSTI ID:6989008

Youssef, O A.S. ^[1]

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1. Misr Engineering Center, Cairo (Egypt)

This paper presents a new algorithm for computing transmission line impedances by digital methods. It describes a new technique for developing a digital filter which has the following features: It eliminates harmonic as well as nonharmonic transient components (with unknown frequencies) in the system voltages and currents; It effectively removes the dc-offset transient component; It explicitly takes account of the dc decay rate which is affected by the effective resistance of the system and the resistance of the arc at the fault location; The frequency response is highly selective as compared to other techniques presented before; The size of the data window required for the computational algorithm is 1.0625 power frequency cycle; The proposed technique is used to calculate impedances of a transmission line from fault data available at a power system bus.

• OSTI ID: 6989008
• 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. 7:4; ISSN 0885-8977; ISSN ITPDE5
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240100 -- Power Systems-- (1990-)
240300* -- Power Transmission Lines & Cables-- (1990-)
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALGORITHMS
CALCULATION METHODS
COMPUTER CODES
DIGITAL SYSTEMS
ELECTRIC IMPEDANCE
ELECTRICAL FAULTS
FREQUENCY RESPONSE TESTING
IMPEDANCE
MATHEMATICAL LOGIC
PERFORMANCE TESTING
POWER TRANSMISSION LINES
TESTING
TRANSIENTS