Statistical Distribution of Energization Overvoltages of EHV Cables

Ohno, Teruo; Bak, Claus Leth; Ametani, Akihiro; Wiechowski, W.; Sørensen, Thomas

doi:10.1109/tpwrd.2013.2254726

Cited by 24 publications

(13 citation statements)

References 4 publications

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“…The mean value is the instant at which the voltage peak of that pole occurs, the standard deviation (σ) is 1 ms, and the distribution curve is truncated at -3σ and +3σ. 50 closing times are simulated for each pole to obtain an accurate set of statistical data [3], [9], [14]. Statistical simulations are implemented in PSCAD by the use of multiple-run feature and random number generators based on the normal distribution.…”

Section: A Simultaneous Cable and Reactor Energization At Voltagementioning

confidence: 99%

Countermeasures of Zero-Missing Phenomenon in (E)HV Cable Systems

Khalilnezhad

Popov

Sluis

et al. 2018

IEEE Trans. Power Delivery

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Zero-missing is a phenomenon in shuntcompensated cable systems, in which the current through the line breaker does not cross the zero point for several cycles. This paper deals with a thorough investigation on countermeasures of the zero-missing phenomenon in transmission systems and determines the requirements, benefits, and risks of applying each method. The effectiveness of countermeasures is studied on a simulated cable project with different cable lengths in an actual grid model of the Dutch 380 kV transmission system. Results are analyzed based on three criteria related to the IEC standards and the Dutch grid code. In addition, the switching sequence of circuit-breakers is specified to maximize the effectiveness of the countermeasures. A statistical switching analysis is performed for the insulation coordination study since the application of some countermeasures increases the probability of high transient switching overvoltages. Moreover, the closing variation threshold of circuit-breakers is calculated as a function of the circuit impedance and the shunt compensation degree.

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Section: A Simultaneous Cable and Reactor Energization At Voltagementioning

confidence: 99%

Countermeasures of Zero-Missing Phenomenon in (E)HV Cable Systems

Khalilnezhad

Popov

Sluis

et al. 2018

IEEE Trans. Power Delivery

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“…Moreover, minimum insulation clearances are provided for various equipments. Several papers discussed different approaches towards modelling techniques of power systems as well as types of analysed circuits [5][6][7][8]. The general goal is to determine if any kind of lightning or switching event can lead to substantial overvoltage that could result in failure of working devices or lead to acceleration of insulation ageing processes.…”

Section: Review Of Insulation Coordination Procedures For Vcb Installmentioning

confidence: 99%

Grid connected photovoltaic power plants: new aspects in switching procedures with vacuum circuit breakers involved

Kuczek

Florkowski

2017

IET Generation, Transmission & Distribution

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“…The detailed study of the statistical distribution of line energization overvoltages (OHL or cable) are addressed in [8]- [17]. In [12], [13], the statistical distribution of energization overvoltages in EHV cables and OHLs are compared, where it is concluded that the overvoltages in a cable line are lower than those in an OHL. However, despite the importance of the issue, there is very limited literature related to the statistical switching analysis of hybrid circuits consisting of OHLs and cables combined.…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis of Energization Overvoltages in EHV Hybrid OHL–Cable Systems

Khalilnezhad

Popov

Sluis

et al. 2018

IEEE Trans. Power Delivery

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Energization overvoltages are among the severest overvoltages stressing insulations of EHV power system components. Since these overvoltages have a statistical nature, the insulation level should be determined with the use of a statistical approach by which the distribution of overvoltages is calculated. Literature has properly studied the distribution of energization overvoltages in purely OHL or cable systems, but such a study is not available for hybrid systems consisting of both OHLs and cables. It is expected that the overvoltage distributions change substantially when both OHLs and cables are used in a transmission line. This paper tackles this issue by analyzing the overvoltage distributions due to the energization of a 380 kV hybrid OHL-Cable circuit, in which the cable length is variable. The study includes various sensitivity analyses to find out the impact of system parameters and topology on overvoltages. By the statistical analysis, it has been discovered that energization overvoltages of a hybrid OHL-Cable circuit are higher than those of a fully-cable circuit and very likely lower than those of a fully-OHL circuit with the same transmission lengths.

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Statistical Distribution of Energization Overvoltages of EHV Cables

Cited by 24 publications

References 4 publications

Countermeasures of Zero-Missing Phenomenon in (E)HV Cable Systems

Countermeasures of Zero-Missing Phenomenon in (E)HV Cable Systems

Grid connected photovoltaic power plants: new aspects in switching procedures with vacuum circuit breakers involved

Statistical Analysis of Energization Overvoltages in EHV Hybrid OHL–Cable Systems

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