RET 54_ Product Guide - ABB Oy Distribution Automation - #29
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Text version of the page
Transformer TerminalRET 541, RET 543, RET 545
1MRS755543 Three-phase overvoltage protection, high-set stage, OV3High, 3U>> Start voltage 0.10 1.60 x Un Operate time 0.05 300.0 s Operation mode ! Not in use ! Definite time Measuring mode ! Phase-to-phase voltages; peak-to-peak measurement ! ! Phase-to-phase voltages; fundamental freq. measurement ! Phase-to-earth voltages; fundamental freq. measurement Operation hysteresis 1.0...5.0% Note! The values below apply when f/fn = 0.95...1.05 Operation accuracy –2.5% of set value Start time: ! ! - injected voltages = 1.1 x start voltage - internal time ! <42 ms - total time <50 ms Reset time ! 40...1000 ms (depends on the minimum pulse width set for the trip output) Reset ratio 0.96 (range 0.95...0.99) Retardation time29