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RET620 is a dedicated transformer management relay on-load tap-changer and offers both manual and automatic tap-changer control. TRANSFORMER PROTECTION AND CONTROL RELAY. LOCAL HMI. RET620. ALSO AVAILABLE regulation capability is targeted for the automatic and manual. View online (63 pages) or download PDF (4 MB) ABB RET620 Product Manual PROTECTION LOCAL HMI ALSO AVAILABLE Master trip Lockout relay 94/86 - 16? prog. The data, examples and diagrams in this manual are included solely for the The 620 series protection relays support a range of communication protocols. The protection relay meets the GOOSE. 1MRS757659 D. Section 2. RET620 overview. RET620. 23. Application Manual. Page 30. performance requirements for tripping ABB RET620 Product Manual (64 pages). Relion 620 series Transformer Protection and Control. Brand: ABB | Category: Other | Size: 5.4 MB. Table of Contents. manual must satisfy themselves that each intended application is suitable and normal conditions the relay is energized and the contact gap 3-5 in slotpush-buttons on LHMI Lockout relay - Disturbance and fault recorders 94/86 - Event log and recorded data U12 0. Page 5 Transformer Protection and Control