Eaton COOPER POWER Series Installation And Operation Instructions Manual

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2 OPERATION AND INSTALLATION INSTRUCTIONS MN280075EN July 2018Form 6 microprocessor-based rack-mount recloser controlThe control can be configured, by the factory or by theuser, for a wide variety of applications. If user requirementschange, the control functions can be modified to meet thenew requirements.Theory of operationCurrent sensing is provided by three current transformerslocated in the recloser and interfaced to the Form 6 reclosercontrol via control wiring. This wiring also supplies Trip,Close, and Recloser status, and connects to the RecloserInterface (RIF) module to provide isolation for reliableoperation. Voltages for metering are connected to theanalog board via the connector terminal block, TB-2.A functional block diagram of the Form 6 recloser controlis shown in Figure 1. Line current flowing through therecloser is converted by the CPU module to a digitalsignal suitable for metering and fault current calculations.Data sampling occurs at a rate of 64 times per cycle. TheCPU contains a data acquisition section that uses theacquired samples to compute the fundamental currentsand voltage for use in overcurrent, under/overvoltage, andunder/overfrequency protection, as well as currents andvoltages for metering functions. The current for overcurrentprotection is calculated on a sub-cycle basis; it includes onlythe fundamental and DC component.TRIP SOLENOIDCLOSE SOLENOIDA Ø CTB Ø CTC Ø CTOPEN / CLOSESWITCHESCT COMMONRECLOSERPOWER 28 VDCAUXILIARYPOWEROUTPUTINTERCON-NECTIONBOARDCPUFRONTPANELRS-232(PROVIEWPROTOCOLONLY)24, 48/125 VDCPOWER INPUTCONNECTIONS3 inputsUSERCONNECTIONS5 outputs8 inputsUSERCONNECTIONS8 outputsMATCHINGTRANSFORMERSAND SIGNALCONDITIONINGANALOG INPUTRIFOPTICALISOLATIONOPTICALISOLATIONOPTICALISOLATIONOPTICALISOLATIONUSERVOLTAGESENSING4 inputsI/OACCESSORYRS-232IRIG-BCOMMUNICATIONSBOARD ACCY•RS-485•FIBER-OPTIC•ETHERNETFigure 1 Form 6 rack mount recloser control operational flow diagramWhen the phase or ground current exceeds its programmedminimum-trip value and associated time-current-curve (TCC)timing, the control initiates the programmed sequence ofrecloser tripping and reclosing operations via the CPU andRIF modules. If the fault is temporary, the control resetsto the start of its operating sequence after a preset timedelay. If the fault is permanent, the control performs itscomplete programmed sequence of reclose commandsand locks out with the recloser open. Once locked out, thecontrol must be closed via the operator panel or SCADAcommunications. This resets the control to the start of theoperating sequence.The following chain of events occurs for an operatingsequence of two trips to lockout (one trip on TCC1,one trip on TCC2):1. The overcurrent signal is integrated with time on theselected curve for the first trip operation (TCC1) toproduce the signal which energizes the trip circuit.2. Energizing the trip circuit connects the supply to thetrip solenoid to open the recloser.3. Upon opening, the control starts timing on the firstreclosing interval-delay time.4. Upon expiration of this reclosing interval-delay, a closingsignal is issued from the control, closing the recloser,and selecting the time-current characteristics for thesecond trip operation (TCC2).5. If current remains above the minimum-trip level, therecloser will trip on TCC2 and lockout the recloser.