Effect of clearing short circuits and automatic reclosing on torsional stress and life expenditure of turbine-generator shafts

Abolins, A.; Lambrecht, D.; Joyce, John S.; Rosenberg, L. T.

doi:10.1109/t-pas.1976.32073

Cited by 81 publications

(15 citation statements)

References 10 publications

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“…Furthermore, large conventional generators are susceptible to resonance of torsional oscillations, because of long shaft lengths and several rotating inertias, greatly increasing the torsional stress at certain points on the shaft [4 -7]. This can lead to shaft fatigue life expenditure and failure [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of loading, voltage difference and phase angle on the synchronisation of a small alternator

Best

Morrow

Crossley

2009

IET Electr. Power Appl.

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Synchronisation of small distributed generation, 30 kVA -2 MVA, employing salient-pole synchronous machines is normally performed within a narrow range of tolerances for voltage, frequency and phase angle. However, there are situations when the ability to synchronise with non-ideal conditions would be beneficial. Such applications include power system islanding and rapid generator start-up. The physical process and effect of out-of-phase synchronisation is investigated both through simulation and experimental tests on a salientpole alternator. There are many factors that affect synchronisation, but particular attention is given to synchronisation angle, voltage difference and, as generators will be loaded during islanding, the load angle. The results suggest that it would be acceptable for the maximum synchronisation angle of distributed generation to exceed that of current practice. Interesting observations on the nature of out-of-phase synchronisation are made, including some specific to small salient-pole synchronous machines. Furthermore, recommendations are made for synchronisation under different system conditions.reactance a angular acceleration u sync synchronisation angle d load angle t time constant F magnetic flux C flux linkage v angular speed Subscripts and superscripts a armature bus power system bus d direct axis (armature) e electrical f field k d direct-axis damper k q quadrature axis damper m mechanical m d direct-axis mutual m q quadrature-axis mutual

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Section: Introductionmentioning

confidence: 99%

Effect of loading, voltage difference and phase angle on the synchronisation of a small alternator

Best

Morrow

Crossley

2009

IET Electr. Power Appl.

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“…This is because the optimal reactor capacity depends on many variables, as indicated in Eq. (7). Those variables vary with the configuration and condition of the system.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Such operations can result in transient mechanical forces on both the rotating and stationary components of the turbine generator. These forces can damage the turbine generator shaft; in the worst cases, even to the point of causing shaft breakage [6][7][8][9][10][11][12]. Thus, development of effective reclosing schemes that consider the effect on the turbine generator is necessary.…”

Section: Introductionmentioning

confidence: 99%

Development of a Reclosing Scheme for Reduction of Turbine Generator Shaft Torsional Torques: A Decision Method to Achieve Optimal Reactor Capacity

Oh¹,

Seo²,

Yang³

et al. 2014

Journal of Electrical Engineering and Technology

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-It is well known that line switching operations like reclosing are able to cause transient power oscillations which can stress or damage turbine generators. This paper presents a reclosing scheme to reduce the shaft torsional torques of turbine generators by inserting an additional reactor. A novel method to determine optimal reactor capacity to minimize the torsional torque generated in a turbine generator is also proposed. In this paper, the turbine generator shaft is represented by a multimass model to measure torsional torques generated in the shaft between the turbine and the generator. Transmission systems based on actual data from Korea are modeled to verify the proposed scheme using ElectroMagnetic Transient Program (EMTP) software. The simulation results clearly show the effectiveness of the proposed scheme and torsional torque can be minimized by applying the proposed scheme.

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“…Damage could happen if the phase difference is larger than 90 [11]. Therefore, the probability of damage occurs during out-of-sync reclosure can be calculated as:…”

Section: Impact Of Rocof Protection Failure To Detect Lom Conditionmentioning

confidence: 99%

Risk Assessment Analysis to Find Optimum ROCOF Protection Settings

Adrianti

2014

12th IET International Conference on Developments in Power System Protection (DPSP 2014)

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The rate of change of frequency during transmission system disturbances in UK will increase in incoming years. This is due the decreasing system inertia and increasing maximum generation loss in the system. Therefore, ROCOF protection will require higher setting to prevent unwanted operation while still ensuring correct detection of LOM condition. This paper proposes risk assessment analysis as a technique to find optimum setting which aims to minimise the risk of protection malfunction. The analysis use predicted Great Britain power system generation mix for year 2020 with gone green scenario. The study has successfuly found the optimum setting of the ROCOF protection which provides minimum overall risk under specific assumptions. The recomended setting is 0.5 Hz/s with operating time-delay 500ms.

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Effect of clearing short circuits and automatic reclosing on torsional stress and life expenditure of turbine-generator shafts

Cited by 81 publications

References 10 publications

Effect of loading, voltage difference and phase angle on the synchronisation of a small alternator

Effect of loading, voltage difference and phase angle on the synchronisation of a small alternator

Development of a Reclosing Scheme for Reduction of Turbine Generator Shaft Torsional Torques: A Decision Method to Achieve Optimal Reactor Capacity

Risk Assessment Analysis to Find Optimum ROCOF Protection Settings

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