Digital protection of power transformer based on weighted least square algorithm

Journal Article · Mon Nov 01 04:00:00 EST 1982 · IEEE Trans. Power Appar. Syst.; (United States)

DOI:https://doi.org/10.1109/TPAS.1982.317365· OSTI ID:6003719

Rahman, M A; Dasn, P K; Downton, E R

The paper presents a new weighted leastsqare scheme for differential protection of power transformers using digital techniques. The differential current waveform is modelled as a sum of decaying dc, fundamental and selected higher harmonic components. The model coefficients are established by using a least-square filtering technique for the sampled data. A root mean square error criterion is established to select the proper harmonic orders, data window, weighting matrix and sampling rate for fast detection of internal faults and high restraint against energising transients in transformers. A variety of simulated waveforms is presented to highlight the important features of this algorithm. The results clearly demonstrate the efficacy and weakness of the weighted least square model.

• OSTI ID: 6003719
• Journal Information: IEEE Trans. Power Appar. Syst.; (United States), Journal Name: IEEE Trans. Power Appar. Syst.; (United States) Vol. PAS-101:11; ISSN IEPSA
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
ALGORITHMS
DC SYSTEMS
DIGITAL SYSTEMS
ELECTRICAL EQUIPMENT
ELECTRICAL TRANSIENTS
ENERGY SYSTEMS
EQUIPMENT
HARMONICS
LEAST SQUARE FIT
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MAXIMUM-LIKELIHOOD FIT
NUMERICAL SOLUTION
OSCILLATIONS
POWER SYSTEMS
SAFETY
SAMPLING
TRANSFORMERS
TRANSIENTS
VOLTAGE DROP
WAVE FORMS