PS 441 Directional Time-Overcurrent Protective Device 1 PS 441 in case for wall surface or panel flush mounting PS 441 directional time- overcurrent protective devic- es are used for selective short-circuit protection in high-voltage networks. The networks can be operat- ed with impedance neutral grounding, with resonant grounding, or with an isolated neutral. The PS 441 directional time- overcurrent protective device has the following features: ❏ four-pole measurement (A, B, C, N), ❏ phase-selective phase current timer module with DTOC and IDMT character- istics (IDMT can be set to nor- mally inverse, very inverse, extremely inverse, long time ground fault or RI inverse), ❏ time-lag high set phase current timer module, ❏ residual current timer module with DTOC and IDMT characteristics (IDMT can be set to nor- mally inverse, very inverse, extremely inverse, long time ground fault or RI inverse), ❏ time-lag high set residual current timer module, ❏ tripping matrix, ❏ optional latching of the individual tripping criteria, ❏ possibility of reverse inter- locking, ❏ supplementary short-circuit direction determination feature ❏ signal comparison through pilot wires ❏ circuit-breaker failure protection. The residual current input is designed for standard or for high sensitivity, as desired. In addition to the features listed above, as well as comprehensive self-monitor- ing and fault diagnosis, the PS 441 is equipped with the following supplementary functions: ❏ measuring circuit monitor- ing ❏ operating data acquisition ❏ event counting ❏ fault data acquisition ❏ fault logging The PS 441 is constructed with a multifunctional case design that is equally well suited for wall surface mount- ing or panel flush mounting due to the reversible terminal blocks and reversible mount- ing brackets. The auxiliary voltage for the power supply can be switched internally from 110-250 V DC to 24-60 V DC. The PS 441 has the following inputs and outputs: ❏ 4 current-measurement and 3 voltage-measure- ment inputs, ❏ 2 binary signal inputs (optical couplers) with freely configurable function assignment, ❏ 8 output relays with freely configurable function assignment. Control and display: ❏ local control panel, ❏ 12 LED indicators, includ- ing 9 with freely configura- ble function assignment ❏ PC interface. Parameters may be set either from the local control panel, through the PC interface or via the optional ILSA inter- face, as desired. The ILSA interface supports linking of the PS 441 to an integrated substation control system such as ILS. Numerical Directional Time-Overcurrent Protection with Definite-Time and Inverse-Time Characteristics abcd
1 PS 441 in case for wall surface or panel flush mounting
PS 441 directional time-overcurrent protective devic-es are used for selectiveshort-circuit protection inhigh-voltage networks.
The networks can be operat-ed with impedance neutralgrounding, with resonantgrounding, or with an isolatedneutral.
The PS 441 directional time-overcurrent protective devicehas the following features: four-pole measurement
(A, B, C, N), phase-selective phase
current timer module withDTOC and IDMT character-istics(IDMT can be set to nor-mally inverse, very inverse,extremely inverse, longtime ground fault or RIinverse),
time-lag high set phasecurrent timer module,
residual current timermodule with DTOC andIDMT characteristics(IDMT can be set to nor-mally inverse, very inverse,extremely inverse, longtime ground fault or RIinverse),
time-lag high set residualcurrent timer module,
tripping matrix, optional latching of the
individual tripping criteria, possibility of reverse inter-
locking, supplementary short-circuit
direction determinationfeature
signal comparison throughpilot wires
circuit-breaker failureprotection.
The residual current input isdesigned for standard or forhigh sensitivity, as desired.
In addition to the featureslisted above, as well ascomprehensive self-monitor-ing and fault diagnosis, thePS 441 is equipped with thefollowing supplementaryfunctions: measuring circuit monitor-
ing operating data acquisition event counting fault data acquisition fault logging
The PS 441 is constructedwith a multifunctional casedesign that is equally wellsuited for wall surface mount-ing or panel flush mountingdue to the reversible terminalblocks and reversible mount-ing brackets.The auxiliary voltage for thepower supply can beswitched internally from110-250 V DC to 24-60 V DC.
The PS 441 has the followinginputs and outputs: 4 current-measurement
and 3 voltage-measure-ment inputs,
2 binary signal inputs(optical couplers) withfreely configurable functionassignment,
8 output relays with freelyconfigurable functionassignment.
Control and display: local control panel, 12 LED indicators, includ-
ing 9 with freely configura-ble function assignment
PC interface.
Parameters may be set eitherfrom the local control panel,through the PC interface orvia the optional ILSA inter-face, as desired.
The ILSA interface supportslinking of the PS 441 to anintegrated substation controlsystem such as ILS.
Numerical Directional Time-OvercurrentProtection with Definite-Time andInverse-Time Characteristics
2 Inverse-time characteristics 3 Directional characteristics in short-circuit direction determination
0.14(I /IB)0.02 – 1
13.5(I /IB) – 1
80(I /IB)2 – 1
120(I /IB) – 1
1
The following triggering timecharacteristics are availablein the inverse time-delaymode: normally inverse, very inverse extremely inverse, long time ground fault, RI inverse.
Mode, base current, charac-teristic type and characteris-tic factor can be set inde-pendently for the phasecurrent timer module and theresidual current timer module.
Tripping Matrix and Latch
The tripping matrix is used todecide which of the individu-al overcurrent timer modulesshall participate in formingthe general trip command.The phase-selective phasecurrent timer module ispermanently assigned to thegeneral trip command; thiscannot be changed. Anothermatrix is used to determinewhich of the individual trip-ping criteria shall result inlatching of the general tripcommand.
The PS 441 directional time-overcurrent protective deviceis equipped with four current-measurement inputs A, B, Cand N and has the followingovercurrent timer modules: phase-selective phase
current timer module I>/tI>, residual current (neutral
current) timer module IN>/tI,N>, high set phase current
timer module I>>/tI>>, high set residual current
timer module IN>>/tI,N>>.
The modules measured in theground path have an effecton the general start signaland therefore on the start of afault record, and this effectcan be inhibited, if desired.Formation of the general tripcommand by the residualcurrent timer modules is thenautomatically disabled.
The phase current timermodule tI> and the residualcurrent timer module tI,N> canhave a definite-time delay oran inverse-time delay, asdesired.
The function of circuit breakerfailure protection is alsoconsidered in the trippingmatrix and in the matrix forsetting the latching function.
Reverse Interlocking
The individual overcurrenttimer modules can beblocked externally by twoindependent signals. In thisconnection it is possible byusing one selection matrix todetermine which of the timermodules shall be included inthe block. This makes itpossible to add on a featuresuch as reverse interlocking,for example (”busbar protec-tion with starting scan”).
characteristicfactor
characteristicfactor
characteristicfactor
characteristicfactor
characteristicfactor
Measure- Start Selec- Measurands Characristicment ted Angle αP or αN
System Imeas Vmeas
P A IA VB-C = VB-N – VC-N +45°B IB VC-A = VC-N – V A-N +45°C IC VA-B = VA-N – VB-N +45°
A - B IA VB-C = VB-N – VC-N +60°B - C IC VA-B = VA-N – VB-N +30°C - A IC VA-B = VA-N – VB-N +60°
A - B - C IC VA-B = VA-N – VB-N +45°
N N IN VNG = –1/3 · (VA-N + VB-N + VC-N) –90° to +90° (adjustable)
0.339 – –––––0.236(I/IB)
Short-Circuit DirectionDetermination
The short-circuit directiondetermination function makesit possible for the PS 441 tobe used as directional time-overcurrent protection. Onecan select separately foreach individual time-overcur-rent timer module whether themodule shall be forward-directed, reverse-directed ornon-directional. The direc-tions for the phase currenttimer modules and the resid-ual current timer modules aredetermined in separatemeasurement systems.
In the direction measuringsystem for the phase currenttimer modules the phase-to-phase voltage opposite theselected phase current isused for direction determina-tion as a function of the typeof fault, and an optimumcharacteristic angle is used(see Figure 3).
Vmeas
(reference quantity)
backward decision
forward decision
a
I meas
1171
7.D
S4
3
In the direction measuringsystem for the residual cur-rent timer modules, directionis determined using theinternally computed neutraldisplacement voltage; thecharacteristic angle is adjust-able with reference to thevarious network starpointtreatments. The directionmeasuring system for theresidual current timer mod-ules is not enabled until a setvalue for neutral displace-ment voltage is exceeded. Inthis connection one canselect whether the triggeringpreorientation for a non-enabled direction measuringsystem for residual currenttimer modules shall beblocked in the event of phasecurrent starting.
Teleprotection
Teleprotection can be used inconjunction with short-circuitdirection determination. Forthis purpose the protectivedevices must be suitablyconnected by pilot wires onboth ends of the line sectionto be protected. One canselect whether teleprotectionwill be controlled by thedirection measuring systemof the phase current timermodules only, by the direc-tion measuring system of theresidual current timer mod-ules only, or by the directionmeasuring systems of thephase current and residualcurrent timer modules. Forprotective devices on theinfeed side of radial net-works, teleprotection canalso be controlled without theshort-circuit direction deter-mination function.
When the trip command isissued a timer module formonitoring the circuit breakeris also started. When thistimer module has elapseddue to a sustained generalstart condition, then thecircuit breaker failure signalis issued.
The input of a circuit breakerfailure signal through anappropriately configuredbinary input brings about anon-delayed trip command ifthe general start signal ispresent.
Measuring-CircuitMonitoring
Measuring-circuit monitoringincludes phase current andphase-to-phase voltagemonitoring. Phase-to-phasevoltage monitoring is onlyactive if the short-circuitdirection determinationfunction is activated.
Phase current monitoring isbased on the principle ofmaximum allowable magni-tude unbalance, whereby thearithmetic difference betweenthe maximum and minimumphase currents as referred tothe maximum phase currentis compared with the setthreshold operate value.Even with an economy-typeCT connection (CTs in onlytwo phases) it is possible tomonitor the phase currentsgiven appropriate settings.
Phase-to-phase voltagemonitoring is based on aplausibility check involvingthe phase currents. If a lowcurrent threshold setting isexceeded by at least onephase current, the threephase-to-phase voltages aremonitored for a set minimumlevel.
Fault Recording
The sampled values of thethree phase currents and thethree phase-to-ground volt-ages are recorded during afault event with additionalpre- and post-roll. A memoryarea of a total of 4 s record-ing depth is reserved for thispurpose in the PS 441. Thesampled values of up to fivefaults may be written to thismemory. If there are morethan five faults, or if themaximum recording time of 4 sis exeeded, the oldest fault(s)will be overwritten. The mostrecent fault is stored in non-volatile memory. The identifi-cation of the individual faultsby a number is the same asthat of the fault event record.
Using a personal computerand the analysis and controlprogram FPC the fault re-cording as well as the protec-tion indications can be readvia the PC or ILSA interfaceand displayed together as afunction of time.
Self-Monitoring
Extensive monitoring routinesin the PS 441 ensure thatinternal hardware or softwarefaults will not lead to malfunc-tioning of the protectiverelaying system. When theauxiliary voltage VA is turnedon, a function test is carriedout. Cyclic self-monitoringtests are run during opera-tion. If test results deviatefrom the default value, a faultsignal is issued. The result offault diagnosis determineswhether a protective blockwill occur or whether only awarning will be issued. Thefaults diagnosed in conjunc-tion with self-monitoring arestored in a memory (monitor-ing signal memory).The contents of the monitor-ing signal memory can beread from the local controlpanel.
Operating Data Acquisi-tion
The PS 441 directional time-overcurrent protective deviceacquires the following meas-ured operating data, updat-ing them at approximately 1 sintervals, as long as a fault isnot being processed at thetime: maximum value of the three
The measured data aredisplayed as r.m.s. valuesand are normalized to thecorresponding nominal valueof the protective device.
Event Counting
The PS 441 directional time-overcurrent protective devicecounts the following events: tripping on faults, faults, warning entries.
Fault Data Acquisition
After the end of a generalstart condition, the followingmeasured fault data areacquired: running time, short-circuit current.
Fault Logging
The signals appearing duringa fault are logged in chrono-logical order. A total of fivefaults, each involving amaximum of 63 starting orending signals, can bestored in a ring memory(signal memory). If there aremore than five faults and nofaults have been erased inthe interim, the oldest faultlog with be overwritten. Afour-digit resettable counteridentifies the individual faultsby serial number. The faultlogs can be read from thelocal control panel.
The PS 441 consists of analuminum case with reversi-ble plug-in screw-type termi-nals and reversible sidebrackets. The case can beused for wall surface mount-ing or for panel flush mount-ing, as desired. In eithercase the unit is connected byscrew terminals.
The processor module carry-ing the local control panel ismounted directly on the rearof the removable front panel.It is connected to the com-bined input-output module bya flat connecting cable. Theinput-output module containsthe voltage supply, the inputtransducers, the outputrelays, and the optical cou-plers for the binary inputs.
In the front panel are win-dows for the display andlabel strips located behindthem. The keyboard for theintegrated local control paneland the PC interface are alsolocated in the front panel.
Figure 5 on Page 10 showsthe case and mountingdimensions.
Local Control Panel
The integrated local controlpanel has two 4-digit7-segment LCD displays andsix keys. The settings, meas-urands and signals arenumerically coded. Thiscode is called the addressand is displayed in the lower4-digit 7-segment display.Accidental or unauthorizedmodification of settings isimpeded by access barriers.
Twelve light-emitting diodesare provided as visual indica-tors. The first three havepermanent signal assign-ments, while the other ninecan be configured as desired(see Page 9).
The control panel has twolabel strips. The strip on theleft is used to label the LEDindicators, and the strip onthe right provides a visualrecord of frequently per-formed control steps. Bothstrips can be replaced andlabeled by the user as de-sired.
5
PS 441 Directional Time-Overcurrent Protective DeviceTechnical Data
General Data
DesignCase suitable for wall surfacemounting or panel flush mounting.
Installation PositionVertical ± 30°
Degree of ProtectionPer DIN 40 050IP 51
Weight4 kg
DimensionsSee Page 10
Terminal Connection DiagramSee Page 10
PC InterfaceDIN 41652 connector, typeSubmin-D, 9-pin.A special connector cable is requiredfor electrical isolation.
ILSA InterfaceOptical fiber interface F-SMA
TerminalsScrew-type M4 terminals,self-centering with wire protection forconductor cross sections of0.5 to 6 mm2 or 2 x 2.5 mm2
Creepage Distances and ClearancesPer IEC 255-5Group C
Notices
The product designated as „PS 441Directional Time-Overcurrent Protec-tive Device“ has been designed andmanufactured in conformance withinternational standard EN 60255-6and also with the „EMC Directive“and the „Low Voltage Directive“issued by the Council of the EuropeanCommunity.
DQS CertificateDQS (Deutsche Gesellschaft zurZertifizierung von Qualitäts-sicherungssystemen), an internation-ally recognized, independent andneutral association for the certificationof quality assurance systems, hasawarded AEG the DQS certificate,thereby certifying that AEG hasintroduced and uses a qualityassurance system that conforms tothe state of the art and satisfies allrequirements stated in DIN ISO 9001that apply to its products andservices.
Tests
Type Test
All tests in accordance withEN 60255-6 and DIN 57435 Part 303
EMC
Emitted InterferencePer EN 50022 and DIN VDE 0878 Part 3.Class B
1 MHz BurstPer IEC 255 Part 22-1,Class IIICommon-mode or longitudinalvoltage: 2.5 kVNormal-mode or transverse voltage:1.0 kVTest duration: > 2 sSource impedance: 200 Ω
Immunity to Electrostatic DischargePer EN 60801 Part 2Severity: 3Contact discharge,single discharges: > 10Hold time: > 5 sTest voltage: 6 kVTest generator:50 to 100 ΜΩ, 150 pF / 330 Ω
Immunity to High-FrequencyElectromagnetic FieldsPer EN 50140Severity: 3Antenna-testpiece distance:> 1 m on all sidesField strength in range 80 to 1000 MHz:10 V/mTest with AM: 1 kHz / 80%Single test at 900 MHz:AM 200 Hz / 100%
Surge Withstand CapabilityPer IEC 1000-4-5Installation class: 3Test of power supply circuits,asymmetrical or symmetrical linesOpen-circuit voltage: 1.2 / 50 µsShort-circuit current: 8 / 20 µsAmplitude: 1 or 2 kVPulses: > 5/minSource impedance: 12 or 42 Ω
Immunity to Conducted InterferenceInduced by High-Frequency FieldsPer IEC 65A or 77B, Sec.145 or 110Severity: 2Test voltage: 3 V
Immunity to Magnetic Fields HavingPower Engineering Frequencies
Per EN 61000-4-8Severity: 4Frequency: 50 HzField strength: 30 A/m
EMC (continued)
Immunity to Interruption and Ripple inAuxiliary DC QuantitiesPer IEC 255-1112% or 50 ms
Insulation
Voltage TestPer IEC 255-52 kV AC, 60 sDirect voltage (2.8 kV DC) must beused when administering the voltagetest to the power supply inputs. ThePC interface must not be subjected tothe voltage test.
Vibration TestPer IEC 255 Part 21-1Test severity class 1Frequency range in operation:10 to 60 Hz, 0.035 mm60 to 150 Hz, 0.5 gFrequency range during transport:10 to 150 Hz, 1 g
Shock TestPer IEC 255 Part 21-2Test severity class 1Acceleration: 5 g/15 gPulse duration: 11 ms
Seismic TestPer IEC TC 41 B (CO) 54Class 1Frequency range:4 to 8 Hz, 3.5 mm / 1.5 mm9 to 36 Hz, 1.0 g / 0.5 g
Routine TestAll tests per EN 60255-6 andDIN 57435 Part 303
CurrentNominal current Inom: 1or 5 A(per order)Nominal consumption per phase:< 0.3 VA at Inom
Load rating:continuous: 4 Inom
for 10 s: 30 Inom
for 1 s: 100 Inom
VoltageNominal voltage Vnom:100 to 130 V ACNominal consumption per phase:< 0.3 VA at Vnom
Load rating:continuous 156 V AC
FrequencyNominal frequency fnom:50 and 60 Hz (switchable)
Binary Signal Inputs
Equipment:2 optical coupler inputs (freelyconfigurable)Function assignment: see Page 9Nominal auxiliary voltage VI,nom:24 to 250 V DCOperating range: 0.8 to 1.1 VI,nom
with a residual ripple of up to 12% ofVI,nom
Power consumption per input:35 mA ± 30% at VI,nom = 24 V DC15 mA ± 30% at VI,nom = 48 V DC4 mA ± 30% at VI ,nom = 60 to 250 V DC
Output Relays
Equipment:8 output relays (freely configurable)
Function assignment: see Page 9
Contact ratingRated voltage:300 V DC, 250 V ACContinuous current: 5 AShort-time current: 30 A for 0.5 sMaking capacity:1000 W (VA) at L/R = 40 msBreaking capacity:0.2 A at 220 V DC and L/R = 40 ms4 A at 230 V AC and cos ϕ = 0.4
Local Control Panel
Input or output of protection data:via six keys and two 4-digit displaysState and fault signals:12 LED indicators(3 permanently assigned,9 freely configurable)Function assignment: see Page 9
PC Interface
Transmission speed:300 to 9600 baud (adjustable)A special PC connector cable isrequired for connecting to a PC (seePage 12)
ILSA Interface
Transmission speed:50 to 19200 baud (adjustable)
Information Output
Operating Data Acquisition
Max. phase current Increments:IP,max primary: 0 to 9999 A 1IP,max p.u.: 0 to 60.00 Inom 0.01
Phase currentsIA: 0.00 to 60.00 Inom 0.01IB: 0.00 to 60.00 Inom 0.01IC: 0.00 to 60.00 Inom 0.01
Residual (neutral) currentIN: 0.000 to 9.999 Inom 0.001
Phase-to-phase voltageVA-B: 0.00 to 2.00 0.01VB-C: 0.00 to 2.00 0.01VC-A: 0.00 to 2.00 0.01
Neutral-to-ground voltageVN-G: 0.00 to 1.50 Vnom / √3
Load angle ϕA, ϕB, ϕC:–180° to +180° 1
Energy direction P:A B Cbackward backward backwardbackward backward forwardbackward forward backwardbackward forward forwardforward backward backwardforward backward forwardforward forward backwardforward forward forward
Energy direction N:backward/forward
Phase relation IN to Σ I:in opposition/in phase
Event Counting
Number of trip commands: 0 to 9999Number of warnings: 0 to 30Number of faults: 0 to 9999
Fault Data Acquisition Increments:
Running time:0.00 to 99.99 s 0.01Short-circuit current:0.00 to 60.00 Inom 0.01
Fault Logging
Maximum number of faults that canbe stored in memory:5 (then oldest fault is erased)
Number of signals per fault that canbe stored in memory:63 (then overflow signal)
Base point releases for phase-to-phase voltages (direction check):0.6 Vnom
Base point releases for phase-to-phase voltages (direction evaluation):0.001 Vnom
Base point release for residualcurrent:Normal range: 0.05 Inom
Sensitive range: 0.005 Inom
Base point release for ground-to-neutral voltage:0.015 to 0.6 Vnom / √3 (adjustable)
Deviations
Reference conditions
Deviation relative to setting forsinusoidal signals, total harmonicdistortion ≤ 2%,ambient temperature 20 °C andnominal auxiliary voltage VA,nom
Time-Overcurrent Protection
Deviation under reference conditions:±5%Variation at 20°C ±20 K: ±1%Variation at fnom ±5%: ±5%Variation at VA,nom ±20%: ±0.5%
Time Delays
Deviation under reference conditionsfor inverse time delays:±5% +10 to 20 ms at I ≥ 2 IB
(±7.5% for extremely inverse)for definite time delays:±0.5% +20 to 40 msVariation at 20°C ±20 K: ±1%Variation at fnom ±5%: ±2.5%Variation at VA,nom ±20%: ±0.5%
Direction Determination
Deviation under reference conditions:±10°Variation at 20°C ±20 K: ±2Variation at fnom ±5%: ±1°Variation at VA,nom ±20%: ±0.5°Base point releases: ±10%
Operating Value Measurement
Currents > 0.2 Inom
Deviation: ±5%Variation at 20°C ±20 K: ±2.5%Variation at VA,nom ±20%: ±1%
Fault Data Acquisition
Fault currentDeviation: ±5%Variation at 20°C ±20 K: ±2.5%Variation at VA,nom ±20%: ±1%
Internal Clock
With free running internal clockDeviation: < 1 min. / month
With synchronization via DCF77 clockDeviation: < 10 ms
Power Supply
Nominal auxiliary voltage VA,nom:24 to 60 V DC and (internally switchable)110 to 250 V DC or 100 to 230 V AC
Operating range for direct voltage:0.8 to 1.1 VA,nom
with a residual ripple of up to 12% of VA,nom
For alternating voltage:0.9 to 1.1 VA,nom
Nominal consumption:approx. 8 W / 10 W(initial position / active position)at VA = 220 V DC
Start-up peak current:< 13 A, duration 0.25 ms
Short-Circuit DirectionDetermination
Activated: no/yes
Direction for tI>, tI>>, tI,N>, tI,N>>:forward-directedbackward-directednon-directed
Charac. angle αG:–90° to +90°; Increments: 5
Threshold operate value VN-G>:0.05 to 0.60 Vnom/√3; Increments: 0.05
Triggering pre-orientation:no/yes
Block preorientation N:no/yes
Circuit Breaker FailureProtection
tCBF: 0.00 to 9.99/∞ s; Increments: 0.01
Measuring-Circuit Monitoring
Mode Idiff>:withoutIA, IC
IA, IB, IC
Threshold operate value Idiff>:0.25 to 0.50 IPmax; Increments: 0.05
Threshold operate value Vmin<:0.40 to 0.90/∞Vnom; Increments: 0.05
Delay time tMCM:0.00 to 9.99s; Increments: 0.010.0 to 99.9 s; Increments: 0.1
Teleprotection
Activated:no/yes
Direction dependence:withoutphase systemneutral systemphase and neutral system
Transmission reset time:0.00 to 9.99 s; Increments: 0.01
Signal comparison start time:0.00 to 9.99 s, Increments: 0.01
Transmission, DC loop:Transmission relay with break contactTransmission relay with make contact
Settings (continued)
Time Overcurrent ProtectionPhase Currents
DTOC
Threshold operate value I>: Increments:0.1 to 40.0/∞ Inom 0.1
Delay time t I>: Increments:0.00 to 9.99 s 0.0110.0 to 99.9/∞ s 0.1
Hold time tI> hold: Increments:0.0 to 9.9 s 0.110 to 600 s 1
Threshold operate value I>>: Increments:0.1 to 40.0/∞ Inom 0.1
Delay time t I>>: Increments:0.00 to 9.99 s 0.0110.0 to 99.9 s 0.1
IDMT
Base current IB: Increments:0.10 to 4.00 Inom 0.01
Characteristic factor: Increments:0.10 to 4.00 Inom 0.01
Characteristic type:Normally inverseVery inverseExtremely inverseLong time ground faultRI inverse
Hold time tI> hold: Increments:0.0 to 9.9 s 0.110 to 600 s 1
Threshold operate value I>> andDelay time tI>>: see DTOC
Time Overcurrent ProtectionResidual Current
DTOC
Threshold operate value IN>: Increments:IN = norm.: 0.02 to 8.00/∞ Inom 0.01IN = sens.: 0.002 to 0.800/∞ Inom 0.001
Delay time t I,N>: Increments:0.00 to 9.99 s 0.0110.0 to 99.9/∞ s 0.1
Hold time tI> hold: Increments:0.0 to 9.9 s 0.110 to 600 s 1
Threshold operate value IN>>:Increments:IN = norm.: 0.02 to 8.00/∞ Inom 0.01IN = sens.: 0.002 to 0.800/∞ Inom 0.001
Delay time t I,N>>: Increments:0.00 to 9.99 s 0.0110.0 to 99.9/∞ s 0.1
IDMT
Base current INB: Increments:IN = norm.: 0.02 to 8.00/∞ Inom 0.01IN = sens.: 0.002 to 0.800/∞ Inom 0.001
Characteristic factor: Increments:0.10 to 4.00 Inom 0.01
Characteristic type:Normally inverseVery inverseExtremely inverseLong time ground faultRI inverse
Hold time tI> hold: Increments:0.0 to 9.9 s 0.110 to 600 s 1
Threshold operate value IN>> andDelay time t I,N>>: see DTOC
The signal inputs allow inter-vention in the protectivesequence. Each input can beset for one of the signalsgiven in Table 1. However, agiven signal may be as-signed to only one input. Thesignal names refer to the”active” state of the inputsignal. Each input can be setas follows:active = low signalactive = high signal.
The output relays are freelyconfigurable and can beassigned any of the signalslisted in Table 3. Any signalcan also be assigned to morethan one free output relay forcontact multiplicationpurposes.
All relays operate in open-circuit arrangement (themake contact is closed whenthe signal is present) exceptfor the case where an outputrelay is configured for thesignal ”MAIN: Blocked/faulty.” In this case the con-tact opens when the deviceis blocked/faulty.
PS 441 Directional Time-Overcurrent Protective DeviceSignal List
LED Indicators
Three LED indicators on thelocal control panel havepermanently assigned sig-nals (Table 2a). The othernine LED indicators are freelyconfigurable and can beassigned any of the signalslisted in Table 2b.
9
U 1
U 2
Table 1:Freely ConfigurableSignal InputsInput Func- Signal
Case prepared forpanel surface mounting 1panel flush mounting with cover frame 2
Nominal current Inom
Phase current input 1 A and residual current input 1 A 1Phase current input 5 A and residual current input 5 A 2Phase current input 5 A and residual current input 1 A 3
Nominal frequency fnom
50 Hz and 60 Hz 2
Nominal auxiliary voltage for power supply VA,nom
24 to 60 V DC and 110 to 250 V DC or 100 to 230 V AC 3
Nominal auxiliary voltage for signal inputs VI,nom
24 to 250 V DC 3
Residual current modulewith sensitive setting range 1with normal setting range 2
ILSA interfacewithout 0for plastic fiber optical link 1for glass fiber optical link 2
Additional options
Labeling and documentation in English -598
Accessories
PC connector cable ( 2.5 m) 255 002 096
FPCC parameterization program 251 254 271
FPC control program 251 254 675
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ALSTOM Energietechnik GmbHProtection and Control Unit · Lyoner Straße 44-48, D-60528 Frankfurt · Postfach 71 01 07, D-60491 Frankfurt · Germany
