ABB REU 610 Technical Reference Manual

Also see for REU 610: Installation manual Operator's manual Technical reference manual Technical reference manual Operator's manual

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ABB REU 610 Technical Reference Manual Manual pdf 28 page image

for the set resetting time. If the residual voltage ex ceeds the set start valueagain while the timer is running, the timer is cleared and the start of the stageremains active.Consequently, the set resetting time ensures that when the stage starts becauseof voltage spikes, it is not immediately reset. If stage U0> has already tripped,the stage is reset in 5 0 ms after the residual voltage falls below 0.5 times theset start value of the stage. H owever, if stage U0> has already tripped and theresidual voltage has fallen below the set start value of the stage, but not below0.5 times the set start value, the stage is reset after the set resetting time ( t0r>)has ex pired.When the residual voltage ex ceeds the set start value of the high- set stageU0>>, the stage generates a start signal after a ~ 60 ms’ start time. W hen theset operate time has elapsed, the stage generates a trip signal.If stage U0>> has started and the residual voltage falls below the set startvalue of the stage, the start of the stage remains active for 100 ms. If theresidual voltage ex ceeds the set start value again while the timer is running,the timer is cleared and the start of the stage remains active. If stage U0>> hasalready tripped, the stage is reset in 5 0 ms after the residual voltage fallsbelow 0.5 times the set start value of the stage. H owever, if stage U0>> hasalready tripped and the residual voltage has fallen below the set start value ofthe stage, but not below 0.5 times the set start value, the stage is reset after the100 ms’ resetting time has ex pired.Stage U0> can be set out of operation in S GF 3 / 3 and stage U0>> can be setout of operation in S GF 3 / 4 . This state is indicated by dashes on the L CD andby 9 9 9 when the set start value is read via serial communication.It is possible to block the tripping of a residual overvoltage stageby applying a digital input signal to the relay.5.1. 4 . 5 . C i r c u i t- b r eak er f ai lu r e p r otec ti onThe circuit- breaker failure protection ( CBF P) detects situations where the tripremains active although the circuit breaker should have operated.The CBF P unit generates a trip signal via output PO2 when the set operatetime of CBF P ex pires.The CBF P can be triggered internally via protection functions. All thesignals, ex cept ex ternal trip, routed to output PO1 trigger the CBF P. If thefault situation is not cleared when the set operate time has elapsed, the CBF Pgenerates a trip signal via output PO2.28REU 610 Voltage RelayTechnical Reference Manual1MRS755769

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