Abstract
On the French distribution grid, protection against faults in the presence of distributed generators is mainly based on autonomous interface protection relays that take into account phase-to-phase voltages characteristics (RMS value and frequency) and zero sequence of phase-to-earth voltage (RMS value). Transfer trip is also used on a small proportion of production sites. This study brings details about the different settings used on the French grid, their advantages and drawbacks, and focuses on the benefits of the new setting, which reduce the risk on the interconnected transmission grid stability while maintaining the distribution grid performance.
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