Protection of Six Phase Transmission system of Allegheny Power System, USA against shunt faults

Sekhar, G. Chandra; Subramanyam, P. S.

doi:10.1109/iseg.2014.7005603

Cited by 2 publications

(4 citation statements)

References 3 publications

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“…In Equation (1), as in the rest of this paper, the symmetrical components are referred to phase A. α is the phasor rotation operator given in Equation (2), which rotates a phasor counterclockwise by 72 • (360 • divided by 5, the number of phases in a five-phase electrical system) when multiplied by it [27]. It also satisfies the mathematical relation given in Equation (3), which is used later in this paper.…”

Section: Investigation Methodologymentioning

confidence: 99%

“…Single-phase and three-phase electrical systems represent the vast majority of alternating current (AC) systems, but AC installations and equipment with a different number of phases also exist. For example, two-phase power distribution is still present in some parts of Philadelphia-a remnant of the old two-phase power system [1] and pilot six-phase transmission lines are currently operated by some grid operators [2,3]. Scott transformers converting three-phase power to two-phase power are used in some traction applications and to supply special two-phase loads [4], whereas experimental transformers that convert three-phase power to either five-phase [5,6] or seven-phase power [7,8] have been built for research purposes.…”

Section: Introductionmentioning

confidence: 99%

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Symmetrical Components and Sequence Networks Connections for Short-Circuit Faults in Five-Phase Electrical Systems

Ciontea

2022

Electricity

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The method of symmetrical components is an important mathematical tool for electrical engineering, as it simplifies the analysis of unbalanced electrical circuits. The method is used almost exclusively for three-phase networks, but with the advancement of multiphase electrical systems, it could be convenient to utilize it for such systems as well. In this paper, the method of symmetrical components is used to analyze a generic five-phase electrical system for various short-circuit faults and to determine the sequence networks connections for these faults. The analysis performed covers the derivation of the symmetrical components for voltage/current and of fault currents. The analytical results and the inferred sequence networks connections are validated by computer simulations. This paper therefore extends the literature on short-circuit analysis of multiphase electrical systems using the method of symmetrical components.

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Section: Investigation Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Symmetrical Components and Sequence Networks Connections for Short-Circuit Faults in Five-Phase Electrical Systems

Ciontea

2022

Electricity

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“…Refs. [12][13][14][15][16][17][18][19], depends on artificial intelligence approaches will provide the fail detection of SHIF fault, and fail to distinguish between OCFs and SHIFs, Moreover, the effectiveness of these schemes is severely reliant on their architecture and training, and Refs. [14,15], depends on the sequence components approaches with several threshold values will provide the fail to distinguish between OCFs and SHIFs, also it fails to achieve precise selectivity of the faulty line.…”

Section: Plos Onementioning

confidence: 99%

“…Only a limited number of them have been implemented for the protection of BCFs, including the techniques involving negative sequence components and negative to positive current sequence techniques, as outlined in Refs. [14,15]. These techniques have some limitations for practical applications, such as using several threshold values, where estimating their proper values for practical systems is a real challenge.…”

Section: Introductionmentioning

confidence: 99%

Identification of broken conductor faults in interconnected transmission systems based on discrete wavelet transform

Rashad,

Ibrahim,

Gilany

et al. 2024

PLoS ONE

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Interconnected transmission systems are increasingly spreading out in HV networks to enhance system efficiency, decrease reserve capacity, and improve service reliability. However, the protection of multi-terminal lines against Broken Conductor Fault (BCF) imposes significant difficulties in such networks as the conventional distance relays cannot detect BCF, as the BCF is not associated with a significant increase in current or reduction in voltage Traditionally, the earth fault relays in transmission lines may detect such fault; Nonetheless, it suffers from a long delay time. Moreover, many of the nearby earth fault relays detect the BCF causing unnecessary trips and badly affecting the system stability. In this article, a novel single-end scheme based on extracting transient features from current signals by discrete wavelet transform (DWT) is proposed for detecting BCFs in interconnected HV transmission systems. The suggested scheme unit (SSU) is capable of accurately detecting all types of BCFs and shunt high impedance faults (SHIFs). It also adaptively calculates the applied threshold values. The accurate selectivity in multi-terminal lines is achieved based on a fault directional element by analyzing transient power polarity. The SSU discriminates between internal/external faults effectively utilizing the time difference observed between the first spikes of aerial and ground modes in the current signals. Different fault scenarios have been simulated on the IEEE 9-Bus, 230 kV interconnected system. The achieved results confirm the effectiveness, robustness, and reliability of SSU in detecting correctly BCFs as well as the SHIFs within only 24.5 ms. The SSU has confirmed its capability to be implemented in interconnected systems without any requirement for communication or synchronization between the SSU installed in multi-terminal lines.

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Protection of Six Phase Transmission system of Allegheny Power System, USA against shunt faults

Cited by 2 publications

References 3 publications

Symmetrical Components and Sequence Networks Connections for Short-Circuit Faults in Five-Phase Electrical Systems

Symmetrical Components and Sequence Networks Connections for Short-Circuit Faults in Five-Phase Electrical Systems

Identification of broken conductor faults in interconnected transmission systems based on discrete wavelet transform

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