A Kalman filter based digital percentage differential and ground fault relay for a 3-phase power transformer

Journal Article · Sun Jul 01 04:00:00 EDT 1990 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/61.57970· OSTI ID:6801440

Murty, Y V.V.S.; Smolinski, W J ^[1]

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1. Dept. of Electrical Engineering, Univ. of New Brunswick, Fredericton, NB (CA)

This paper presents the design and real-time implementation of a Kalman filter based digital percentage differential and ground fault protection scheme for three phase power transformers. A set of eleven-state Kalman filters is used to estimate the fundamental and up to fifth harmonic components of the transformer current signals. The protective relay is equipped with an even harmonic restraint during magnetizing inrush conditions and a fifth harmonic restraint during overexcitation conditions. The restraint during external faults is proved by means of a percentage differential characteristic. The relay operates in half a cycle during internal faults. In order to achieve sensitive ground fault protection, separate primary and secondary ground fault protection are provided. The relay algorithm is implemented on a single TMS320 digital signal processor and tested in real-time using a three phase laboratory power transformer.

• OSTI ID: 6801440
• Journal Information: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (USA), Journal Name: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (USA) Vol. 5:3; ISSN 0885-8977; ISSN ITPDE
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240200* -- Power System Networks
Transmission & Distribution-- (1990-)
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALGORITHMS
ELECTRIC GROUNDS
ELECTRICAL EQUIPMENT
ELECTRICAL FAULTS
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
HARMONICS
MATHEMATICAL LOGIC
OSCILLATIONS
RELAYS
TRANSFORMERS