Understanding the calculation method for successful line reclosing is essential in power system operations. Here’s a detailed breakdown of the process:
1) For single-sided power supply lines: If the power source side successfully recloses, it counts as one successful reclosure. In this case, the integrated recloser should operate in single-phase mode. If a three-phase trip occurs, the recloser will attempt to re-close all three phases simultaneously.
2) For lines with power supplies on both sides (or multiple sides): A successful reclosure is only counted if both sides (or all sides) successfully reclose. If one side fails to reclose or the operation is unsuccessful, the entire line reclosure is considered a failure, and no count is recorded.
3) Certain conditions do not allow for reclosing due to system constraints. These include cases where reclosing is disabled, one side has its recloser turned off, phase failure single-phase reclosing misalignment, or fault trips caused by reactors. In such scenarios, the line cannot be reclosed automatically, and manual intervention may be required depending on the system configuration.
This process ensures that the power grid remains stable and reliable, minimizing downtime and preventing further damage to equipment during fault conditions.
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