Loss of excitation protection for modern synchronous generators

Berdy, J.

doi:10.1109/t-pas.1975.31987

Cited by 136 publications

(100 citation statements)

References 2 publications

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“…If this generator is not shut down, the adjacent generators start increasing the production of reactive power up to the limit when their limiters of rotor and stator currents act. The effect of loss of excitation on adjacent generators is analyzed in more details in [8].…”

Section: Loss Of Excitation Protectionmentioning

confidence: 99%

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Loss of excitation of synchronous generator

Krištof

Mešter²

2017

Journal of Electrical Engineering

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This paper presents results of study of loss-of-excitation phenomena simulations. Loss of excitation is a very common fault in synchronous machine operating and can be caused by short circuit of the field winding, unexpected field breaker open or loss-of-excitation relay mal-operation. According to the statistic [1], the generator failure due to loss-of-excitation accounts for 69 % of all generator failures. There has been concern over possible incorrect operation of the relay when operating the generator in the under-excited region, during stable transient swings and during major system disturbances. This article can serve as inputs for system operators in preparation of operation area or protection relaying area.

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Section: Loss Of Excitation Protectionmentioning

confidence: 99%

“…However, there is an area of generator operation when this type of protection can function improperly. These are the cases when generator operated in under excited condition, during stable transient power swings in the grid and during significant system outages with frequency drop [8].…”

Section: Loss Of Excitation Protectionmentioning

confidence: 99%

Loss of excitation of synchronous generator

Krištof

Mešter²

2017

Journal of Electrical Engineering

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“…1(b). This figure shows the relay operation zones according to References 15,16, and 17. These zones contain two circles.…”

Section: Loss Of Excitation (Loe) Relaymentioning

confidence: 99%

Performance comparison of LOE protection of synchronous generator in the presence of UPFC

Ebrahimi

Ghorbani

2016

Engineering Science and Technology, an International Journal

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Available online Keywords: Generator loss of excitation (LOE) protection Unified power flow controller (UPFC) Phasor measurement units (PMUs) Flexible AC transmission system (FACTS) A B S T R A C TGenerator loss of excitation (LOE) protection is a principal protection of power system which operate based on impedance measurement. This relay calculates impedance by measuring voltage and current at the generator terminal. On the other hand, the presence of unified power flow controller (UPFC) in transmission lines changes measured voltage and current signals during loss of excitation. In this paper, the impact of UPFC on the performance of LOE protection has been analytically investigated. Afterwards, using modeling results, it has been attained that the presence of UPFC leads to the drastic delay on the performance of LOE relay. This delay results to the overloading and damaging of armature winding of generator. It is also shown that in partial LOE presence of UPFC causes under-reach of the relay. Finally, the phasor measurement units (PMUs) based method has been proposed to reduce the effect of UPFC on the LOE protection. The results indicate that using this new method, the delay of LOE relay has been reduced. In the surveys conducted, various conditions of the power system have been considered.

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“…The majority of them are based on the impedance method [7][8][9][10]. In fact, the most widely used technique for synchronous generator LOE detection is a negative offset distance relay with two protective zones [10].…”

Section: Literature Reviewmentioning

confidence: 99%

Impact of static synchronous compensator on flux‐based synchronous generator loss of excitation protection

Yaghobi

2015

IET Generation, Transmission & Distribution

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In order to increase the power transfer and providing the optimum utilisation of the power system capability, application of flexible alternating current transmission system (FACTS) devices technology, such as static synchronous compensator (STATCOM), has been attracted, in recent years. However, the STATCOM changes the voltage and current of the power system that disturb the operation of the impedance-based synchronous generator loss of excitation (LOE) protection. Then, this study proposes a new flux-based LOE protection method, in the presence of STATCOM, that is based on the local variation of the flux linkage of the generator available at the location of relay. The mentioned relay is independent of other generator protection relays without any coordination. In order to show the satisfying operation of the proposed method, some simulations have been carried out in the Matlab/Simulink software. A single-machine infinite bus and a three-machine infinite bus systems have been used in simulations. The results show that the presence of STATCOM has no important effect on the performance of proposed relay opposite to a negative offset relay with two protective zones (the widely used impedance method) which is affected by STATCOM operation.

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Loss of excitation protection for modern synchronous generators

Cited by 136 publications

References 2 publications

Loss of excitation of synchronous generator

Loss of excitation of synchronous generator

Performance comparison of LOE protection of synchronous generator in the presence of UPFC

Impact of static synchronous compensator on flux‐based synchronous generator loss of excitation protection

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