High speed directional relaying algorithm based on the fundamental frequency positive sequence superimposed components

Gu, Bin; Jian-cheng, Tan; Wang, Hua

doi:10.1049/iet-gtd.2013.0440

Cited by 25 publications

(19 citation statements)

References 24 publications

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“…45 Even today, in modern microprocessor relays, the mentioned algorithm is used to discriminate direction of fault. 46,47 Phase angle of positive-sequence impedance, [48][49][50][51][52][53][54][55][56][57][58][59][60] difference phase angle of postfault current and a reference current signal, 61 and negative-sequence of current and voltage signals 62 are some attractive approaches of this group. In the following, some advantages and disadvantages of these algorithms are presented:…”

Section: List Of Symbols and Abbreviations: Vmentioning

confidence: 99%

“…Even today, in modern microprocessor relays, the mentioned algorithm is used to discriminate direction of fault . Phase angle of positive‐sequence impedance, difference phase angle of postfault current and a reference current signal, and negative‐sequence of current and voltage signals are some attractive approaches of this group. In the following, some advantages and disadvantages of these algorithms are presented: In general, algorithms of the second group are funded on fundamental frequency, estimated using discrete Fourier transform (DFT).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, they have more immune performance against waveform distortions, noises, and CT saturation compared with the other groups. In general, they have at least one cycle delay for the detection. So, they are slower than algorithms of the other groups. Since positive‐sequence components appear in all faults, signal pole tripping (SPT) could not be employed using the proposed algorithm in Some of fault types do not include the negative‐sequence components.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of directional relay algorithms in presence of wind turbines and fault current limiters

Samet

Ghanbari

Ashtiani

et al. 2018

Int Trans Electr Energ Syst

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Summary Connection of distributed generations (DGs) to distribution networks changes their radial construction to mesh type and increases fault current level. In order to prevent over current relay tripping in case of out‐of‐zone faults, direction of faults must be determined. On the other hand, fault current limiters (FCLs) are a suitable technique to reduce the issue of fault current increasing. In this paper, it is confirmed that operation of FCLs affects voltage and current signals, drastically. Since fault direction is detected by directional relays using these signals, hence, FCLs can affect the performance of the relays. In the other hand, if the added DG is a wind turbine, it may affect the directional relays performance due to intricate fault behavior of wind turbines. To investigate the mentioned hypothesis, some of directional relaying algorithms are evaluated in presence of wind turbine and FCL.

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Section: List Of Symbols and Abbreviations: Vmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of directional relay algorithms in presence of wind turbines and fault current limiters

Samet

Ghanbari

Ashtiani

et al. 2018

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

show abstract

“…Most MP-based protections have only analog inputs of voltage and current circuits [7], [8]. Signal from the protected circuit is received from the symmetrical component filter or directly from primary current converters, which are mostly current transformers (CT) (owing to which MP-based systems have some drawbacks).…”

Section: Special Features Of Signal Conversion In Mp-based Protectionsmentioning

confidence: 99%

Selection of Digital Filter for Microprocessor Protection Relays

Solovev¹

2018

IJECE

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The article considers some issues related to replacement of electromechanical relays used for protection of power facilities with microprocessor relays. One of the urgent problems connected with implementation of microprocessor overcurrent protections is how to use current transducers other than usual current transformers and in particular Rogowski coils that become more and more widespread. In the article are compared twelve methods of synthesis of a digital filter basing on the analog prototype -second-order integrating filter. The bilinear filter and Boxer-Thaler filters are analyzed in respect to their use in microprocessor relays. Basing on the research results a technique for selection of parameters of digital integrating filters for microprocessor relays is proposed. Simulation results show that Boxer-Thaler and bilinear filters have better accuracy during transient current measurements than the analog filter. The study allows concluding that in many cases the digital second-order bilinear filter is the best choice for use in microprocessor relays.

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“…In the literature several techniques have been reported to solve the directional relaying problems of transmission line [20][21][22][23]. The algorithms are mainly based on voltage or current information.…”

Section: Introductionmentioning

confidence: 99%

A positive-sequence current based directional relaying approach for CCVT subsidence transient condition

Biswal

2017

Prot Control Mod Power Syst

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In this work, a directional relaying algorithm is proposed for transmission line to prevent relay maloperation during coupling capacitor voltage transformer (CCVT) subsidence transient. The effect of CCVT subsidence transient during single-pole-tripping condition is highlighted in this paper. The proposed method which is based on phase angle difference of post fault and prefault positive sequence current can help the directional relay to take accurate decision during erroneous CCVT secondary response. The available CCVT model in PSCAD is not able to generate significant subsidence transient in the secondary side. So, a new CCVT model is developed in EMTDC/PSCAD domain for transient response analysis and to check the relay operation. Next, the performance of different voltage and current information based directional relaying techniques have been analyzed and compared with the proposed method. The results are evaluated for different system and fault conditions. Results demonstrate the accuracy of the proposed method.

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High speed directional relaying algorithm based on the fundamental frequency positive sequence superimposed components

Cited by 25 publications

References 24 publications

Evaluation of directional relay algorithms in presence of wind turbines and fault current limiters

Evaluation of directional relay algorithms in presence of wind turbines and fault current limiters

Selection of Digital Filter for Microprocessor Protection Relays

A positive-sequence current based directional relaying approach for CCVT subsidence transient condition

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