Emulations of Overvoltage and Overcurrent Relays In Transmission Lines

Amreiz, H.; Janbey, Alan; Darwish, M.

doi:10.1109/upec55022.2022.9917757

Cited by 3 publications

(2 citation statements)

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“…Configuring OCRs with the requisite time/current characteristics is crucial for optimal performance [3]. These types of relays are usually linked to potential transformers and regulated to work on, either above or below an appropriate voltage or current level [4]. Relay coordination is critical in the defense response.…”

Section: Introductionmentioning

confidence: 99%

An Intelligent Model and Simulation of High Voltage Transmission Line Protection Using Time Overcurrent Relay Optimization Settings

BONIFACE,

Sitati,

Byiringiro

et al. 2024

Preprint

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The novel method based on optimal overcurrent relay settings and coordination for effective substation relays in interconnected power systems was designed and developed. In this paper, the feeder impedance equivalences, phase-to-phase fault currents, current settings of 110kV incoming and 15kV outgoing feeders, and operating times for relay characteristics (standard, very, and extremely inverse of overcurrent relay) of the power network were computed and determined. The maximum fault current of the interconnected power grids was considered. The network MVA short circuit was considered with both positive and negative sequence impedance of the feeder. The power system parameters like X/R ratio, current transformer (CT) ratio, transmission line length, positive & zero-sequence resistances, positive & zero-sequence inductances, full load current, line capacity, CT ratio for outgoing feeders, grid frequency, and real power were also considered and deployed in the power network. To ensure safety, reliable, and rapid operation of overcurrent relays, settings such as pickup value, time setting multiplier (TMS) of 0.05sec, and overcurrent relay (OCR) characteristics were carefully considered. The selection and determination of OCR characteristics were taken into account by calculating the fault current levels of each fault location percentage based on feeder impedance, turn CT ratio, and pickup values. The results proved that the OCRs coordination interval time to fastest clear faults was between 0.0927 sec-0.062 sec, 0.0949 sec-0.0720 sec, and 0.0764 sec-0.0661 sec for extremely, very, and standard inverse relays, respectively.

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Section: Introductionmentioning

confidence: 99%

An Intelligent Model and Simulation of High Voltage Transmission Line Protection Using Time Overcurrent Relay Optimization Settings

BONIFACE,

Sitati,

Byiringiro

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

An Intelligent Model and Simulation of High Voltage and Medium Voltage Transmission Line Protection Scheme Using Time Overcurrent Relay Optimization Settings

Ntambara,

Sitati,

Wambua

et al. 2023

Preprint

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A new method for optimizing overcurrent relay (OCR) settings and coordination in interconnected power systems was developed. The method considers factors such as feeder impedance equivalences, phase-to-phase fault currents, current settings of 110kV incoming and 15kV outgoing feeders, and operating times for relay characteristics (standard, very, and extremely inverse of overcurrent relay). The maximum fault current of the interconnected power grids is also considered. Power system parameters like X/R ratio, current transformer ratio, transmission line length, resistances, inductances, full load current, line capacity, CT ratio for outgoing feeders, grid frequency, and real power are also considered. To ensure safety and rapid operation of overcurrent relays, settings such as pickup value, time setting multiplier (TMS), and OCR characteristics are carefully considered. The results show that the OCRs coordination interval time to fastest clear faults range from 0.0927 sec-0.062 sec to 0.0764 sec-0.0661 sec for extremely, very, and standard inverse relays, respectively.

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Three Phase Fault Analysis Using Thermal-Magnetic Circuit Breaker and Overcurrent Relay

Oyon,

Shufian,

Kabir

et al. 2023

2023 International Conference on Information and Communication Technology for Sustainable Development (ICICT4SD)

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Emulations of Overvoltage and Overcurrent Relays In Transmission Lines

Cited by 3 publications

References 0 publications

An Intelligent Model and Simulation of High Voltage Transmission Line Protection Using Time Overcurrent Relay Optimization Settings

An Intelligent Model and Simulation of High Voltage Transmission Line Protection Using Time Overcurrent Relay Optimization Settings

An Intelligent Model and Simulation of High Voltage and Medium Voltage Transmission Line Protection Scheme Using Time Overcurrent Relay Optimization Settings

Three Phase Fault Analysis Using Thermal-Magnetic Circuit Breaker and Overcurrent Relay

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