A New Relaying Algorithm to Detect Loss of Excitation of Synchronous Generators
A new digital relaying algorithm is introduced for the protection of synchronous generators against loss of excitation conditions. The new algorithm is based on measuring of the 3-phase reactive power output of the machines, and monitors the direction and magnitude of leading reactive power at the generator terminal. The protection algorithm is designed such that it can provide reliable protection against loss of field conditions and remains stable during recoverable power system swing conditions. While the new relay produces a trip signal for partial loss of field conditions causing the machine to lose its stability, it remains stable for the partial loss of field conditions that can be corrected via machine excitation and AVR systems.
Anahtar Kelimeler:
Digital relaying, generator protection, reactive power, loss of field, capability curve
A New Relaying Algorithm to Detect Loss of Excitation of Synchronous Generators
A new digital relaying algorithm is introduced for the protection of synchronous generators against loss of excitation conditions. The new algorithm is based on measuring of the 3-phase reactive power output of the machines, and monitors the direction and magnitude of leading reactive power at the generator terminal. The protection algorithm is designed such that it can provide reliable protection against loss of field conditions and remains stable during recoverable power system swing conditions. While the new relay produces a trip signal for partial loss of field conditions causing the machine to lose its stability, it remains stable for the partial loss of field conditions that can be corrected via machine excitation and AVR systems.
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- Generator parameters: Rated voltage:24 kV Rated power:991 MVA at cos ϕ = 0.8 Rated excitation current:1640 A xd= 1.15 pu, xq= 0.685 pu, xd = 0.31 pu, xq = 0.68 pu, xd= 0.21 pu, xq= 0.182 pu
- Transformer rated power:1300 MVA
- For each transmission line:r = 4.74 ohm, x = 21.34 ohm. Automatic Voltage Regulator: VT Vmax V min Ks fs +Ts f Ka= 250 Kf= 0.04 Te= 0.04 Tr= 0.015
- ISSN: 1300-0632
- Yayın Aralığı: Yılda 6 Sayı
- Yayıncı: TÜBİTAK
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A New Relaying Algorithm to Detect Loss of Excitation of Synchronous Generators