Numerical Overcurrent Protection

NumericalOvercurrent ProtectionAdding to the PROCOM range of modular relays, theNPI800 and NPID800 relays protect three-phase electricalnetworks against all types of phase to earth and phase tophase short-circuits.The NPID800 also features adirectional function. An optional4 cycles recloser is available witheach versionAs well as the usual protectionfunctions, NP800 relays providemonitoring, measurement andrecording of the electrical quantitiesof the network.The relays can be set locally, usingeither the keypad or the RS232 port,or remotely using the RS485 port.The calculation of electrical values isachieved by Fast FourierTransforms.The settings, readings, measurementsand recordings are all availablelocally or remotely.INDUSTRIELLE DE CONTRÔLEET D’EQUIPEMENT11, rue Marcel Sembat94146 ALFORTVILLE CedexTél : +33 1 41 79 76 00Fax : +33 1 41 79 76 01Site : www.icelec.comE-mail : contact@icelec.comNPI800 functions• 3 phase fault thresholds of overcurrentprotection [50] [51]• 2 earth-fault thresholds protection [50N][51N]• Thermal overload protection for cablesand transformers [49]• Negative sequence overcurrentprotection [46]• 2 thresholds of broken conductorprotection [46BC]• Circuit breaker failure protection [50BF]• Latching output contacts [86]NPID800Additional functions• 3 phase fault thresholds of overcurrentdirectional protection [67]• 2 earth-fault thresholds directionalprotection [67N]Common option• 1 fast cycle and 3 slow cycle recloser[79]

CHARACTERISTICSAuxiliary Supply• Auxiliary supply ranges• Typical burden• Power off withstand• Memory backupAnalogue Inputs• Phase current inputs In 1 or 5A19 to 70 – 85 to 255 / DC or AC 50 or 60 Hz6W (DC), 6 VA (AC)20 ms72 hoursmeasurement from 0.3 to 24 In – burden at In < 0.2 VAcontinuous rating 3 In, short duration withstand 100 In/1 sdisplay of primary currents from 0 to 64 kA• Earth current input In 0 1 or 5A measurement from 0.03 to 2.4 In 0 – burden at In 0 < 0.5 VAcontinuous rating 2 In 0 , short duration withstand 40 In 0 /1 sdisplay of primary current from 0 to 6.4 kA• Frequency• Phase voltage inputs Un 100 to 120 V• External phase to earth voltage• Recommended CTsLogical Inputs (4, 8 according to relay)• Level 0• Level 1• BurdenRelays Outputs (4, 8 according to relay)• Relay A, B option E, F• Relay C, watchdog, option D, GEarth current input from Ring CT 100/1 adjustment from 0.6 to 48 A primary45-55 or 55-65 Hzmeasurement from 3 to 240 V – continuous rating 240 Vmeasurement from 3 to 240 V – continuous rating 240 V5VA 5P20< 10 V range 19 to 70 Vdc / Vac – < 33 V range 85 to 255 Vdc / Vac> 20 V range 19 to 70 Vdc / Vac – > 37 V range 85 to 255 Vdc / Vac< 15 mAdouble contact NO, permanent current 8 Aclosing capacity 10 A/4 sshort circuit current withstand 100 A/30 msbreaking capacity DC with L/R = 40 ms:50Wbreaking capacity AC with cosϕ = 0. 4:1250 VAchangeover contact, permanent current 16 Aclosing capacity 25 A/4 sshort circuit current withstand 250 A/30 msbreaking capacity DC with L/R = 40 ms:50Wbreaking capacity AC with cosϕ = 0.4:1250 VAPhase and Earth Fault Overcurrent and Directional Functions [50] [51] [67] [50N] [51N] [67N]• Phase fault thresholds1%, between 0.5 and 4 In3% from 0.3 to 0.5 In and from 4 to 24 In• Earth fault thresholds1% from 0.05 to 0.4 In3% from 0.03 to 0.05 In and from 0.4 to 2.4 In• Instantaneous operating time40, 50 or 60 ms including trip relay for I ≥ 2 Is• Independent time delaysfrom 40 ms to 300 s, ± 2% or 20 ms• Timing curves [51] [51N]according to IEC 255-4, ANSI IEEE and configurable (factory set, consult us)• Dependent time delays class 5TransformerThermal Overload [49]• Timing curves according to IEC 255-8• Heating time-constant CTE 4 to 180 min, class 5• Cooling time-constant 1 to 6.0 C TE , in step of 0.1• Negative sequence factor 0 to 9• Load reclosing factor 50 to 100%• Thermal reference current I ref 40 to 130% In, class 5• Thermal alarm threshold 80 to 100% Θ I ref , class 5• Reclosing inhibit thermal threshold 40 to 100% I re ., class 5Cable Thermal Overload [49]• Timing curves according to IEC 255-8• Heating time constant C TE 4 to 180 min, class 5• Alarm threshold 80 to 100% ΘIb, class 5• Trip threshold 0.4 to 1.3 In, class 5Broken Conductor [46BC]• Inv/Iph threshold 10 to 250%• Operating timefrom 40 ms to 300 s• Independent time delays± 2% or 20 ms

NPI800 - NPID800Negative Sequence Overcurrent [46]• Iph threshold0.1 to 2.4 In, accuracy 5% for Iph > 0.3 Ín• Instantaneous operating time40, 50 or 60 ms including trip relay for I ≥ 2 Is• Independent time delaysfrom 40 ms to 300 s, ± 2% or 20 ms• Timing curvesaccording to IEC 255-4, ANSI IEEE and configurable (factory set, consult us)• Dependent time delays class 5Reclosing Function• On load reclosing ratio 50 to 200%• On load reclosing duration40 ms to 300 s, ± 2% or 20 msUser Programmable Functions [input – output]• Time delay of the user programmable inputs• Status in or out of service• Operating and release time delays40 ms to 300 s• Assignment of name (maximum 14 characters)• Assignment of one or more output relays (alarm or trip)Counters• Break current A 2 per phase I1 or I3 maximum 64 10 6 kA 2• Number of operations 0 to 10 000Recloser [79]See separate technical leafletProgramming• Display• Configuration softwareFrench, Englishunder Windows® 95, 98, NT, 2000, XPFrench, English, Spanish, ItalianMODBUS® Communication (option)• Transmissionasynchronous series, 2 wires• Interface RS 485• Transmission speed300 to 115 000 baudsIEC 60870 – 5 – 103 Communication (option)Consult usDisturbance Recording• Number of recordings 4• Total duration52 periods per recording• Pre fault timeadjustable from 0 to 52 periodsEnvironment• Transient impulses 5 ns IEC 801.4 class 4 (equivalent IEC 255-22-4 class 4)• ShockIEC 255-4 class 3 (5 kV – 1,2/50µs)• Dielectric withstandIEC 255-5 class 3 (2 kV rms – 1 min)• Insulation resistance > 1 000 MΩ according to IEC 255-5• EMC emissivity EN 55011 class A – EN50081-2 group 1• EMC susceptibility IEC 255-22 (1/2/3/4)• Operating temperature -10 to + 55°C – IEC 68-2-1/2• Vibrations IEC 255.21.1 class 1• Mechanical shocks IEC 255.21.2 class 1• E.U. low voltage directive 89/336/CEE dated 03.05.1989• Water and dust protectionIP51 – IEC 529 (front face)Presentation• Height4U• Width 1/4 19"• Brackets 19" rack mountingoption• Display2 lines of 16 characters• Output relays3 or 7, user programmable• Logical inputs• LEDs indicationDimensions• Height, Width, Depth• Weight4 or 8, user programmable1 for Watchdog,and 4 user programmable173 x 106.3 x 250 mm4 kg

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