Numerical Overcurrent Protection

Characteristics• 2 ranges of auxiliary supply voltages covering any DCor AC voltage• Configuration and parameter setting by local HMI oroff-line or on-line PC• Reading and saving relay configuration using PC• Measurement of electrical quantities:NPI800 and NPID800:Average, instantaneous and maximum values ofphase and earth fault currentsDisplay expressed in primary current• Measurement of electrical quantities:NPID800:Values of the phase to phase voltages and phase toearth voltageFrequencyActive / reactive power, average and maximumValue of the thermal overloadCosϕ• Instantaneous alarm thresholds• Independent time tripping• Dependent time tripping according to / inverse / veryinverse / extremely inverse IEC 255-4 curves• Tripping according to RI inverse curve(electromechanical)• Tripping according to moderately inverse / veryinverse / extremely inverse ANSI/IEEE curves:• Thermal overload protection according to IEC 255-8(two models: cable and transformer)• 2 setting groups, locally or remotely selectable• Energy metering: storage of average values / 12hoursActive and reactive power maximum values• Breaker failure monitoring: discrepancy of interlocks,local or remote control of reclosing / tripping• Assistance with circuit breaker maintenance: numberof operations and break current I 2 per phasecounters, alarms• Breaker failure monitoring by checking disappearanceof the currents when opening the circuit breaker• Configuration and operation software compatible withWindows® 95, 98, NT, 2000, XP• User interface with access to all functions• Time stamping of internal events with 1 ms resolution• Event recording: 250 locally recorded events, 200retained in the event of loss of auxiliary supply• Storing of measurements and active setting group• Local/remote acknowledgement of events• Disturbance recording according to Comtrade format:storage of four 52 periods recordings• Disturbance recording initiated by binary input, settingsoftware or communication network• Reclosing function: shift of phase, zero sequence and inverse currentthresholds from external input• Remote setting, remote reading of measurements, counters, alarms, andparameter settings• Remote reading of disturbance recording and event log• Self-diagnosis: RAM, ROM, EEPROM, output relays, A/D converters, auxiliarysupply, cycles of execution of the software, hardware anomaly• Test of wiring, phase rotation and direction of currentOptions• Communication by Modbus® or IEC 60870-5-103 protocol• Logical selectivity on the three phase thresholds and the low and highearth-fault thresholds• Remote control: trip or reclosing, load-shedding with level of priority, andreconnection control• 4 user programmable output relays and 4 user programmable logical inputs(included NPID, option NPI)• 2 dependent time, configurable and downloadable curves(factory set, consult us)• 4 cycle recloser• Trip circuit supervision (a group of 4 inputs is required)Functional diagramOnly documents supplied with our acknowledgement are to be considered as bindingDoc ref: A0322D60