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620 Series Protection Relay Firmware Update 2.1.15 Release Notes

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This document is a release note detailing firmware update 2.1.15 for ABB 620 series protection relays (REF620, REM620, RET620). It covers implemented improvements in cyber security (fixing CVE-2021-22283), supervision, engineering (angle correction range adjustment), and protection functions (including UEXPDIS, PHPVOC, and MPDIF enhancements).

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