Electric Distribution Line Ground Fault Prevention Systems Using Dual Parameter High Sensitivity Relay Device Monitoring With Blown Fuse Protection In A Single Phase Tap Line
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United States of America Patent
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Issued Date -
Jun 13, 2024
app pub date -
Aug 12, 2023
filing date -
Dec 9, 2022
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Abstract
In a system for preventing ground fault or other short circuit in electric distribution line system, caused by a break in a line, utilizing programmable relay protection in a plurality of relay devices programmed to monitor high sensitivity parameters, the improvement of blown fuse protection in a single phase tap line to prevent false operation of the open conductor logic when a tap line fuse successfully interrupts a short circuit on the tap line, which includes: blown fuse protection subsystem having sufficient hardware and software that is programmed to detect changes in negative sequence overcurrent on a single phase tap line, to calculate the change in negative sequence overcurrent, to store a preset acceptable range for change of negative sequence overcurrent, to compare said calculated change in negative sequence overcurrent to said preset acceptable range for change of negative sequence overcurrent.
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