Overvoltages Due to Open-Phase Occurrence in Reactor Compensated EHV Lines

Iliceto, F.; Cinieri, E.; Vita, A. Di

doi:10.1109/mper.1984.5525524

Cited by 5 publications

(12 citation statements)

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“…Actual power systems are not perfectly balanced and, in reality, over-voltages will be limited by nonlinear effects. Reference [3] demonstrates the limiting effects of including transmission line corona losses and shunt reactor saturation effects to obtain realistic simulations of induced over-voltages, which were confirmed by field measurements. Reference [4] gives a detailed investigation of the effects of line construction details on the resonance and induced open-phase over-voltages.…”

Section: Modelling and Simulationsmentioning

confidence: 59%

“…References [3,4] discuss the induced over-voltages that can occur on shunt-compensated EHV transmission lines during resonant or near resonant open-phase conditions, as can happen due to unbalanced switching operations or stuck breaker pole contingencies. The subject is introduced by using a simplified analysis approach to identify important cases to be studied in detail with transient simulations.…”

Section: Modelling and Simulationsmentioning

confidence: 99%

“…The steady-state analysis also provides the resonant frequencies and the compensation required to produce resonance at power frequency for the open-phase conditions. Applying the simplified steady state analysis method discussed in References [3,4] and parameters in the Appendix, the resonant frequencies of 5L2 for two and one open-phase conditions were calculated. Results are listed in Table 2.…”

Section: Modelling and Simulationsmentioning

confidence: 99%

“…Therefore the open-phase voltage is expected to be much lower than for the two open-phase case. The electromagnetic transients model was extended to include reactor saturation and corona losses on 5L2 as discussed in Reference [3]. The two open-phase simulation was repeated with the extended model and the results are shown in Figure 7.…”

Section: Modelling and Simulationsmentioning

confidence: 99%

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Damaging Open-Phase Overvoltage Disturbance on a Shunt-Compensated 500-kV Line Initiated by Unintended Trip

Nagpal

Martinich

Bimbhra

et al. 2015

IEEE Trans. Power Delivery

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Shunt reactors are applied to long extra high voltage transmission lines to compensate for their natural capacitance which otherwise could cause over-voltages under light load conditions. However, when the level of compensation approaches around 65% or higher, these reactors themselves can, due to contingency, become the cause of hazardous over-voltages during unbalanced openphase conditions on the healthy line. This paper reports on an over-voltage incident that occurred on a 500 kV 72% shunt compensated line in the BC Hydro System. The overvoltage occurred when one of the breaker poles failed to interrupt the current following an inadvertent three-phase trip of the healthy line. The uninterrupted current kept one phase energized for an extended time. Temporary overvoltages during this condition and restrike transients eventually led to surge arrester failures at both terminals.Analysis of recordings of voltage and current provided useful insight into the mechanism responsible for the damaging over-voltages as well as the protection and control responses during the disturbance. The intent of this paper is to share the knowledge gained from analyses of the recorded waveforms with other utilities either having or planning for highly compensated lines.

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Section: Modelling and Simulationsmentioning

confidence: 59%

Section: Modelling and Simulationsmentioning

confidence: 99%

Section: Modelling and Simulationsmentioning

confidence: 99%

Section: Modelling and Simulationsmentioning

confidence: 99%

See 2 more Smart Citations

Damaging Open-Phase Overvoltage Disturbance on a Shunt-Compensated 500-kV Line Initiated by Unintended Trip

Nagpal

Martinich

Bimbhra

et al. 2015

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

show abstract

“…Although the possibility of appearing resonant overvoltages under open‐phase condition has been known for several years, few research works can be found that analytically study this phenomenon. In [6], the series resonance phenomenon is studied by obtaining equivalent circuit of the shunt compensated TL when one or two phases are open. It is assumed that there is no magnetic coupling between phases of the shunt reactor.…”

Section: Introductionmentioning

confidence: 99%

Effect of interphase magnetic coupling of shunt reactor on transmission‐line open‐phase overvoltages and neutral reactor optimisation

Eskandari¹,

Jafarian²

2017

IET Generation, Transmission & Distribution

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Open‐phase temporary overvoltage before and after an intermediate subsation accessing a long distance transmission line

Chen

Huashi

et al. 2020

IET Generation Trans & Dist

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In transmission lines, shunt-reactors are commonly applied to counteract the "Ferranti effect." However, in highly compensated lines, hazardous overvoltage may occur during unbalanced open-phase conditions. In addition, when a new substation is put into operation, π circuit can be selected by accessing an existing transmission line and the original shunt-reactor configuration is maintained. Severe overvoltage may occur on the shuntreactor side of the newly installed transmission line. In this study, we analysed the effects of compensation, neutral-reactor, and system frequency on open-phase overvoltage. The maximum deviation of system frequency is <±0.5 Hz, therefore, we suggested maximum critical compensation of the shunt-reactor under different proportional coefficients of neutral-reactor. We analysed the impact of line division, when an intermediate substation is accessed, and a risk range in which the substation located may cause severe overvoltage was proposed. Finally, according to an actual line division project, we optimised the original configuration scheme of the shunt and neutral-reactors. We used electromagnetic transient simulation to verify whether severe overvoltage occurred before and after the power station is accessed. The study results may provide guidance for selection of the π circuit accessing point and for optimising the configuration of the shunt and neutralreactors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Overvoltages Due to Open-Phase Occurrence in Reactor Compensated EHV Lines

Cited by 5 publications

References 0 publications

Damaging Open-Phase Overvoltage Disturbance on a Shunt-Compensated 500-kV Line Initiated by Unintended Trip

Damaging Open-Phase Overvoltage Disturbance on a Shunt-Compensated 500-kV Line Initiated by Unintended Trip

Effect of interphase magnetic coupling of shunt reactor on transmission‐line open‐phase overvoltages and neutral reactor optimisation

Open‐phase temporary overvoltage before and after an intermediate subsation accessing a long distance transmission line

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