An accurate fault locator with compensation for apparent reactance in the fault resistance resulting from remote-end infeed
A microprocessor based fault locator is described, which uses novel compensation techniques to improve accuracy. It displays the distance to the fault in percent of transmission line length, for facilitating repair and restoration following a permanent fault. Also, it pinpoints weak spots following transient faults. This new method for fault location on electric power transmission lines uses recorded phase currents and voltages at the near end. The main feature of the method is that it considers the influence of the remote-end infeed of the transmission line by using a complete network model. A microprocessor filters the ac currents and voltages from the protective relaying instrument transformers to extract the fundamental components of the signals. It then computes the distance to the fault point, compensating for the apparent reactance in the fault resistance resulting from load current and the variations in impedance angles in the power-system network. The design has undergone field tests and evaluation. The outcome of the field tests is presented and has confirmed the validity of the concept of the fault locator, showing an accurate display of the distance to fault.
- Research Organization:
- ASEA AB, Vasteras
- OSTI ID:
- 6120362
- Journal Information:
- IEEE Trans. Power Appar. Syst.; (United States), Vol. PAS-104:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
24 POWER TRANSMISSION AND DISTRIBUTION
ELECTRICAL FAULTS
MEASURING INSTRUMENTS
POWER DISTRIBUTION SYSTEMS
ACCURACY
DIGITAL FILTERS
IMPEDANCE
MICROPROCESSORS
POWER TRANSMISSION LINES
COMPUTERS
ELECTRONIC CIRCUITS
MICROELECTRONIC CIRCUITS
420800* - Engineering- Electronic Circuits & Devices- (-1989)
200300 - Electric Power Engineering- Power Transmission & Distribution- (-1989)