High-speed backup scheme for zone 2 of non-pilot distance relays

Rosas-Ortiz, G.; Sidhu, T.S.

doi:10.1049/iet-gtd:20060472

Cited by 16 publications

(4 citation statements)

References 6 publications

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“…As the three fault currents in (11) are identical, the sum of their differences will be zero. Conversely, if these phasors were not identical, the sum of the absolute value of their differences would be non-zero.…”

Section: ) Three-pole Orcbmentioning

confidence: 99%

“…The AST technique presented in [9] uses the mutual coupling characteristics between faulted and sound phases. Reference [11] takes advantage of the fact that in heavy loading condition, ORCB can change the X/R ratio as well as active and reactive powers measured by the relay. The methods presented in [12], [13] provide AST for end-section faults by interpreting the variations of negative-and zero-sequence currents following ORCB.…”

Section: Introductionmentioning

confidence: 99%

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High-Speed Distance Relaying of the Entire Length of Transmission Lines Without Signaling

Azizi

Sun

Liu

et al. 2020

IEEE Trans. Power Delivery

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Short-circuit faults close to either end of a transmission line, are normally cleared instantaneously by the distance relay at that end and after hundreds of milliseconds, i.e., in Zone 2 operating time, by the relay at the opposite end of the line. This sequential tripping can be accelerated on condition that a reliable communication link is available for signaling between the two line ends. This paper proposes a novel non-communication method providing high-speed distance relaying over the entire length of the protected transmission line. The inputs to the method are the protected line parameters and local voltage and current signals measured by the relay, similar to those to conventional distance relays. The proposed method accomplishes Accelerated Sequential Tripping (AST) within a couple of cycles after the opening of the remote-end circuit breaker (ORCB) of the line. To achieve this, an accurate closed-form solution is derived for the fault distance in terms of post-ORCB voltage and current phasors. For the detection of the ORCB instant, a set of proper indices are proposed. This is to verify the fault distance calculated by the relay, before issuing a trip command. The proposed method is successfully validated by conducting more than 20000 hardware-in-the-loop (HIL) tests, and also using real-life data. Index Terms-Accelerated sequential tripping (AST), Distance relays, Opening of the remote-end circuit breaker (ORCB), Realtime digital simulator (RTDS).

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Section: ) Three-pole Orcbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Speed Distance Relaying of the Entire Length of Transmission Lines Without Signaling

Azizi

Sun

Liu

et al. 2020

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

show abstract

“…Due to signaling-related costs, reliability and technical issues, non-communication AST methods attract more consideration than communication ones. Various noncommunication AST methods have been proposed thus far [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Depending on whether the high-frequency components or fundamental-frequency components of fault signals are used, these methods can be divided into two groups.…”

Section: Introductionmentioning

confidence: 99%

Noncomunication Accelerated Sequential Tripping for Remote-End Faults On Transmission Lines

Azizi

Sun

Terzija

et al. 2019

2019 IEEE Milan PowerTech

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Short-circuit faults close to each end of a transmission line are normally cleared with some time delay by the distance relay at the opposite end of that line. To reduce this time delay, the pilot relaying schemes use communication links. This paper presents a non-communication method that provides high-speed distance relaying over the entire transmission line length. Similar to conventional distance relays, the proposed method requires voltage and current signals at the relay location as well as the impedance parameters of the protected line as inputs. Accelerated sequential tripping (AST) for faults on the endsections of the line is achieved by using the signals measured from the fault inception to several cycles after the operation of the remote-end circuit breaker (ORCB). The results show that the use of post-ORCB signals would accurately yield the fault distance. Two indices for detecting three-and single-pole ORCB are proposed so as to fulfil the prerequisite for accurate fault distance estimation and generating a trip command, if needed. The proposed method is successfully validated by conducting more than 10000 simulation cases on the 39-bus test system using DIgSILENT PowerFactory.

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“…In light of the development of smart grids, the self‐healing power systems place greater demands on the observability and early‐warning capability of protection systems, as well as the selectivity, reliability, rapidity, and sensitivity . In 1 study, the agent‐based solutions were improved to prevent the zone 3 misoperation.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic identification method of distance protection misoperation due to power flow transfer

Dai

Crossley

Liu

et al. 2016

Int. Trans. Electr. Energ. Syst.

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The unintended trip (misoperation) of backup protections caused by overload scenarios or improper relay settings may trigger or accelerate cascading accidents and blackouts. Previous researches on the misoperation identification of the backup protection, focusing around deterministic methods rather than probabilistic information, usually initiates the decision making after the final formation of flow transfer and leaves out the dynamic process of relays after the system fault. Time for taking measures is hence very limited, especially when the communication latency and the calculation task are considered. A new probabilistic identification method of the distance protection misoperation considering the sequential coordination of backup relays is proposed. Then the preliminary implementation architecture of the proposed method is presented, which considers the coordination of computing task allocation, and the information forming and update strategies to make full use of existing protective devices and decrease the communication load. Case studies demonstrate that the method could adapt to different scenarios and identify the potential misoperation reasonably to allow time for taking measures against protection malfunction. Furthermore, it could supply compact reference information for fault review and analysis.

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High-speed backup scheme for zone 2 of non-pilot distance relays

Cited by 16 publications

References 6 publications

High-Speed Distance Relaying of the Entire Length of Transmission Lines Without Signaling

High-Speed Distance Relaying of the Entire Length of Transmission Lines Without Signaling

Noncomunication Accelerated Sequential Tripping for Remote-End Faults On Transmission Lines

Probabilistic identification method of distance protection misoperation due to power flow transfer

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