ABB REM630 Product Manual

Also see for REM630: Applications manual Applications manual

Contents

ABB REM630 Product Manual Manual pdf 13 page image

the IED. The failures are detected by thenegative-sequence based algorithm or by thedelta voltage and delta current algorithm.Upon the detection of a failure the fusefailure supervision function activates an alarmand blocks voltage-dependent protectionfunctions from unintended operation.14. Current circuitsupervisionCurrent circuit supervision is used fordetecting faults in the current transformersecondary circuits. On detecting of a fault thecurrent circuit supervision function can alsoactivate an alarm LED and block certainprotection functions to avoid unintendedoperation. The current circuit supervisionfunction calculates the sum of the phasecurrents and compares the sum with themeasured single reference current from acore balance current transformer or fromanother set of phase current transformers.15. Access controlTo protect the IED from unauthorized accessand to maintain information integrity, the IEDis provided with an authentication systemincluding user management. Using the IEDUser Management tool in the Protection andControl IED Manager PCM600, an individualpassword is assigned to each user by theadministrator. Further, the user name isassociated to one or more of the fouravailable user groups: System Operator,Protection Engineer, Design Engineer andUser Administrator. The user groupassociation for each individual user enablesthe use of the IED according to the profile ofthe user group.16. Inputs and outputsThe IED is equipped with three phase-currentinputs and two residual-current inputs forearth-fault protection. The IED alwaysincludes one residual voltage input fordirectional earth-fault protection or residualvoltage protection. Further, the IED includesthree phase-voltage inputs for overvoltage,undervoltage and directional overcurrentprotection and other voltage based protectionfunctions.The phase-current inputs are rated 1/5 A. TheIED is equipped with two alternative residual-current inputs, that is 1/5 A or 0.1/0.5 A. The0.1/0.5 A input is normally used inapplications requiring sensitive earth-faultprotection and featuring a core-balancecurrent transformer.The three phase-voltage inputs, for eitherphase-to-phase voltages or phase-to-earthvoltages, and the residual-voltage input coverthe rated voltages 100 V, 110 V, 115 V and120 V. The rated values of the current andvoltage inputs are selected in the IED software.In addition, the binary input thresholds areselected by adjusting the IED’s parametersettings. The threshold voltage can be setseparately for each binary input.There is also an optional RTD/mA modulewith 8 RTD/mA inputs and 4 mA outputs.The optional RTD/mA module facilitates themeasurement of up to eight analog signalsvia the RTD or mA inputs and provides fourmA outputs. The RTD and mA inputs can forinstance be used for temperaturemeasurement of motor bearings and statorwindings, thus extending the functionality ofthe thermal overload protection andpreventing premature aging of the motorwindings. Furthermore, the RTD and mAinputs can be used for measuring the ambientair or cooling media temperature. The RTDand mA inputs can be used for supervision ofanalog mA signals provided by externaltransducers. The RTD/mA inputs can bealternatively used also as resistance input orMotor Protection and Control 1MRS756977 DREM630Product version: 1.1 Issued: 2011-05-18ABB 13