Eaton Digitrip RMS 510 Instruction Leaflet

Also see for Cutler-Hammer Digitrip RMS 510: Instructions Instructional Leaflet Instructions

16Instruction Leaflet I. L. 29-885DEffective August 2011Instructions for Digitrip RMS 510 Trip UnitEATON CORPORATION www.eaton.comAPPENDIX A: Zone lnterlockingAssume a ground fault of 2000 Amperes occurs and refer to FigureA 1CASE 1e: There is no Zone Selective Interlocking (standard timedelay coordination is used).Fault 3The branch breaker will trip clearing the fault in 0 1 sFault 2The feeder breaker will trip clearing the fault in 0 3 sFault 1The breaker will trip clearing the fault in 0 5 sCASE 2e: There is Zone Selective lnterlocking.Fault 3The branch breaker trip unit will initiate the trip in 0 03 s to clear thefault and Z3 will send an interlocking signal to the Z2 trip unit; and Z2will send an interlocking signal to Z1Z1 and Z2 trip units will begin to time out, and in the event that thebranch breaker Z3 would not clear the fault, the feeder breaker Z2will clear the fault in 0 3 s (as above) Similarly, in the event that thefeeder breaker Z2 would not clear the fault, the main breaker Z1 willclear the fault in 0 5 s (as above)Fault 2The feeder breaker trip unit will initiate the trip in 0 03 s to clearthe fault; and Z2 will send an interlocking signal to the Z1 trip unitZ1 trip unit will begin to time out, and in the event that the feederbreaker Z2 would not clear the fault, the main breaker Z1 will clearthe fault in 0 5 s (as above)Fault 1There are no interlocking signals The main breaker trip unit will initi-ate the trip in 0 03 sFigure A 2 presents a Zone Selective lnterlocking connection dia-gram for a system with two main breakers from incoming sourcesand a bus tie breaker Note the blocking diode D1 is needed so thatthe feeder breakers can send interlocking signals to both the mainand tie breakers, without having the tie breaker send itself an inter-locking signalFigure A.1 Typical Zone Interlocking (Ground Fault Protection).otese:N A1: Wiring to be twisted pair of AWG No 14 to AWG No 20 RouteZone lnterlocking wiring separate from power conductors DONOT GROUND any Zone Interlock WiringA2: The maximum distance between first and last zone is 250 feet(110 m)A3: A Maximum of 20 breakers may be connected in parallel in oneZoneFigure A.2 Typical Zone Interlocking Connections with Two MainBreakers (M1, M2) and a Tie Breaker (T) (Short Delay Protection).I3200 A ) M a i n 10.5 SecZ20.1 Sec1200 A100 AZone3Legend=Common (Ungrounded)=Short Delay Output Signalto Higher Level Zone= Short Delay Input Signalfrom Lower Level Zone=Ground Output Signalto Higher Level Zone=Ground lnput Signalfrom Lower Level Zone= Fault at Location 2F210 . 1 S e c0 . 1 S e c0 . 1 S e c0 . 1 S e c0 . 1 S e cM 2C CS O S O- -F12 F22 F230 . 5 S e c 0 . 5 S e cS IS OS I0 . 3 S e c1 N 4 0 0 4D1