p342 343 generators protections
TRANSCRIPT
MiCOM P342, P343Generator Protection Relays
MiCOM P342, P343Generator Protection
Relays
T&DProtection & Control
2
MiCOM P342, P343Generator Protection Relays
IntroductionThe MiCOM generator protectionrelays provide flexible and reliableintegration of protection, control,monitoring and measurementfunctions. Extensive functionality isavailable to provide completeprotection and control with twomodels for a wide range ofapplications, covering mostinstallations from small generatorsup to sophisticated systems.
Protection• Generator differential (P343 only)
• 100% stator earth fault(P343 only)
• Non-directional phase overcurrent
• Non-directional earth fault
• Neutral displacement/residualovervoltage
• Sensitive directional earth fault
• Restricted earth fault
• Voltage dependent overcurrent/underimpedance
• Under/overvoltage
• Under/overfrequency
• Reverse power/low forwardpower/overpower
• Loss of field
• Negative phase sequencethermal
• Overfluxing
• Unintentional energisation atstandstill (P343 only)
• 10 RTDs (option)
• Circuit breaker failure
• Voltage transformer supervision
• Current transformer supervision
Control• Programmable scheme logic
• Programmable optically isolatedinputs and relay outputs
• Multiple settings groups
Measurements• Comprehensive measurement
values
• Instantaneous
• Integrated
Post Fault Analysis• Event and fault records
• Disturbance records
Monitoring• Trip circuit monitoring
• Breaker state monitoring
• Breaker condition monitoring
• Temperature monitoring
Communications• A choice of protocols
• Front and rear communicationports
Diagnostics• Power-up diagnostics
• Continuous self monitoring
• Test facilities
User Friendly Interface• Liquid crystal display with
backlight
• Programmable LED indications
• Password protection
• Optional secondary cover
• Fully programmable menu text
Software SupportAvailable in conjunction withMiCOM S1 support software:
• Settings editor
• Programmable scheme logiceditor
• Viewing of fault diagnostics andmeasurements
• Disturbance recorder viewer
• Fully programmable menu text
ApplicationThe MiCOM P342 is suitable forprotection of generators whichrequire cost effective high qualityprotection.
Protection includes overcurrent,earth fault, neutral displacement,sensitive or restricted earth fault,voltage dependent overcurrent orunderimpedance, under andovervoltage, under andoverfrequency, reverse, low forwardor overpower, field failure, negativephase sequence thermal andoverfluxing, as well as VT and CTsupervision. Figure 2a shows an LVapplication with a solidly earthedsystem.
Figure 1: MiCOM P342
3
The MiCOM P343 is suitable forprotection of larger or moreimportant generators, providinggenerator differential, 100% statorearth fault and unintentionalenergisation at standstill in additionto the features of the P342.Figure 2b shows a MiCOM P343application with a resistanceearthed generator.
Protection FunctionsThree phase generator differentialprotection is provided to detectstator phase faults. This can be setas either a percentage bias schemewith a dual slope characteristic oras a high impedance scheme.
Three phase tripping with faultedphase indication is provided for allprotection functions.
Generator differential(P343 only)Three phase generator differentialprotection is provided to detectstator phase faults. This can be setas either a percentage bias schemewith a dual slope characteristic oras a high impedance scheme.
100% stator earth fault(P343 only)Third harmonic neutral undervoltageprotection covers the final 15% ofthe stator winding and, inconjunction with the other earth faultelements, provides 100% earth faultprotection for the stator. This issupervised by a three phaseundervoltage element.
Phase overcurrentTwo independent stages areavailable for each phaseovercurrent. Both stages havedefinite time (DT) delayedcharacteristics, the first stage mayalso be independently set to one ofnine inverse definite minimum time(IDMT) curves (IEC and IEEE).
Standard earth faultThe standard earth fault elementoperates from an earth fault inputconnection to measure the faultcurrent in the earth path of thegenerator.
Two independent stages areavailable for each phase
overcurrent. Both stages havedefinite time (DT) delayedcharacteristics, the first stage mayalso be independently set to one ofnine inverse definite minimum time(IDMT) curves (IEC and IEEE).
Sensitive earth faultA core balance CT should be usedto drive the sensitive earth faultfunction. The directionality isprovided by the residual voltage.
WattmetricThe sensitive earth fault protection isalso suitable for Petersen Coilearthed systems by enabling awattmetric element. This form ofprotection uses the sensitive earth
fault protection directionalcharacteristic, but with a directionalresidual power threshold providingan additional constraint onoperation.
Restricted earth faultThe restricted earth fault protectionmay be configured as either highimpedance or low impedancebiased differential.
Figures 2a and 2b
VTS Voltage transformer supervision27/59 Under/overvoltage81O/81U Under/overfrequency24 Overfluxing87G Generator differentialRTD 10 resistance thermal devicesCTS Current transformer supervision50/51 Non-directional phase overcurrent51V/21 Voltage dependent overcurrent/
underimpedance32R/32L/32O Reverse power/low forward power/
overpower40 Loss of field46 Negative phase sequence50/27 Unintentional energisation at standstill64/67N Restricted earth fault/sensitive earth fault50N\51N Non-directional earth fault27TN 100% stator earth fault59N Residual overvoltage/neutral displacement67N Sensitive earth fault
Figure 2a: MiCOM P342
Figure 2b: MiCOM P343
2759
81O81U 24
51V21
VTS
RTD
5051CTS
32R32L32O
40 46
50N51N 64
2759
81O81U 24
51V21
VTS
RTD
5051CTS
32R32L32O
40 46
50N51N
87G
5027
64
27TN 59N
4
Voltage dependentovercurrent/underimpedanceIn order to provide backupprotection for phase faults, anelement is included which can beset as either voltage controlledovercurrent, voltage restrainedovercurrent or underimpedance.
If selected as voltage controlled orvoltage restrained overcurrent, thetiming characteristic can be set aseither definite time or IDMT.
If selected as underimpedance, athree phase non-directionalunderimpedance element isprovided.
Neutral displacement/residualovervoltageResidual overvoltage protection isavailable for detecting earth faultswhere there is an isolated or highimpedance earth. The residualvoltage can be measured from abroken delta VT, from the secondarywinding of a distribution transformerearth at the generator neutral, orcan be calculated from the threephase to neutral voltagemeasurements.
Two independent stages ofprotection are provided, each canbe set with a definite time delay andone stage can be configured tohave an inverse time characteristic.
Under/overvoltageUnder/overvoltage protection maybe configured to operate from eitherphase-phase or phase-neutralvoltage elements. Two independentstages with definite time elementsare available. The first stage canalso be configured to an inversecharacteristic.
Under/overfrequencyTwo independent stages ofoverfrequency and four of underfrequency are provided. Each stagefunctions as a definite time element.
Power protectionThe power protection elementprovides two stages which may beindependently configured to operateas reverse power, over power orlow forward power protection.These can be used to provide simpleoverload protection, protection
against motoring and/or CBinterlocking to prevent overspeedingduring machine shutdown.
Loss of fieldTo detect failure of the machineexcitation a two stage offset mhoimpedance element is provided.This allows a small instantaneouscharacteristic to be used to providefast tripping for loss of excitation athigh power outputs, where systemstability could be affected.The second stage can be set with alarger time delayed characteristic toprovide stable, secure trippingunder low power conditions.
Integrating timers are provided toenable the impedance characteristicto provide time delayed poleslipping protection.
A power factor alarm element isalso available to offer more sensitiveprotection for unusual operatingconditions, for example a lightlyloaded unit operating as aninduction generator.
Negative phase sequenceTo protect against unbalanced statorcurrents caused by external faults orunbalanced loading, two stages ofnegative sequence protection areprovided. These comprise a definitetime alarm stage and a trip stagethat operates with a thermalcharacteristic.
OverfluxingTo protect the generator, orconnected transformer, againstoverexcitation a two stage V/Hzelement is provided. The first stageis a definite time alarm, the secondstage can be used to provide aninverse/definite time tripcharacteristic.
Unintentional energisation atstandstill (P343 only)If the machine circuit breaker isclosed accidentally, when themachine is not running, very highcurrent will result. A voltagesupervised overcurrent scheme isavailable to protect against thiscondition. When the machinevoltage is low, that is, the machineis not running, an instantaneousovercurrent element is enabled.
Timers ensure that the element willbe stable for normal voltage dipsthat could occur for system faults ormachine reconnection.
Resistance temperaturedevices (RTDs)In order to monitor temperatureaccurately, an option allowingmeasurement of temperatures usingup to 10 platinum RTDs is available.This provides an instantaneousalarm and time-delayed trip outputfor each RTD.
Blocked overcurrent logicEach stage of overcurrent and earthfault protection can be blocked byan optically isolated input.This enables the overcurrent andearth fault protection to beintegrated into a blockedovercurrent busbar protectionscheme.
Supervisory FunctionsCircuit breaker failureprotectionTwo stage circuit breaker failureprotection may be used for trippingupstream circuit breakers and/orthe local secondary trip coil.
The circuit breaker failure logic mayalso be initiated externally fromother protection devices if required.
Voltage transformersupervisionVoltage transformer supervision(VTS) is provided to detect loss ofone, two or three VT signals,providing indication and inhibitionof voltage dependent protectionelements.An optically isolated input may alsobe configured to initiate the voltagetransformer supervision alarm andblocking when used with miniaturecircuit breakers (MCBs) or otherexternal forms of voltagetransformer supervision.
Current transformersupervisionCurrent transformer supervision(CTS) is provided to detect loss ofphase CT signals and inhibit theoperation of current dependentprotection elements.
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ControlProgrammable scheme logicProgrammable scheme logic allowsthe user to customise the protectionand control functions. It is also usedto programme the functionality ofthe optically isolated inputs, relayoutputs and LED indications.
The programmable scheme logiccomprises gate logic and generalpurpose timers. The gate logicincludes OR, AND and majoritygate functions, with the ability toinvert the inputs and outputs, andprovide feedback. The system isoptimised to evaluate changes to thescheme logic signals and thusminimise any delays in logicexecution.
The programmable scheme logicmay be configured using thegraphical MiCOM S1 PC basedsupport software, as illustrated inFigure 3.
The required logic is drawn asshown and is then downloadeddirectly into the relay. The logic mayalso be uploaded from the relayand then modified usingMiCOM S1 support software.
Independent protectionsettings groupsThe settings are divided into twocategories; protection settings andcontrol and support settings.Four setting groups are provided forthe protection settings to allow fordifferent operating conditions andadaptive relaying.
Measurement andRecording FacilitiesThe P340 series is capable ofmeasuring and storing the values ofa wide range of quantities.All events, fault and disturbancerecords are time tagged to aresolution of 1ms using an internalreal time clock. An optional IRIG-Bport is also provided for accuratetime synchronisation.
A lithium battery provides a back-upfor the real time clock and allrecords in the event of supplyfailure. This battery is supervisedand is easily replaced from the frontof the relay.
MeasurementsThe measurements provided, whichmay be viewed in primary orsecondary values, can be accessedby the back-lit liquid crystal display,or the communications ports.Phase notation is user definableusing the MiCOM S1 text editor.
Instantaneous measurementsPhase voltages Van Vbn Vcn
Line voltages Vab Vbc Vca
Neutral voltage Vn
Phase current Ia1 Ib1 Ic1Ia2 Ib2 Ic2
Neutral currents In ISEF
Sequence currents and voltages
Frequency
Single and three phase power factor
Active power Wa Wb WcWtotal
Reactive power VAra VArb VArcVArtotal
Apparent power VAa VAb VAcVAtotal
Bias current Iabias IbbiasIcbias
Differentialcurrent Iadiff Ibdiff Icdiff
3rd harmonicneutral voltage Vn3
Temperature RTD1 …RTD10
Phase currents and phase to neutralvoltages are available in true rmsand fundamental quantities.
Integrated valuesWh VArh
Peak, average and rolling demand:
Ia Ib Ic
W VAr
Post Fault AnalysisEvent recordsUp to 250 time-tagged eventrecords are stored in non-volatilememory, and can be extracted usingthe communication ports or viewedon the front panel display.
Fault recordsRecords of the last 5 faults arestored in non-volatile memory.The information provided in the faultrecord includes:
Indication of faulted phase
Protection operation
Active setting group
Relay and CB operating time
Current, voltage, power andfrequency
Fault duration
Temperatures
Figure 3: Programmable scheme logic editor (MiCOM S1)
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Disturbance recordsThe internal disturbance recorderhas 8 analogue channels, 32 digitaland 1 time channel. Data issampled 12 times a cycle andtypically 20 disturbance records,each of up to 10.5 secondsduration are stored in non-volatilememory. All channels and thetrigger source are user configurable.Disturbance records can beextracted from the relay via theremote communications and savedin the COMTRADE format.These records may be examinedusing MiCOM S1 or any suitablesoftware program.
Plant SupervisionTrip circuit monitoringMonitoring of the trip circuit in bothbreaker open and closed states canbe realised using the programmablescheme logic.
Circuit breaker statemonitoringAn alarm will be generated if thereis a discrepancy between the openand closed contacts of the circuitbreaker.
Circuit breaker conditionmonitoringThe circuit breaker conditionmonitoring features include:
• monitoring the number of breakertrip operations
• recording the sum of the brokencurrent quantity ∑Ix, 1.0≤ x ≤2.0
• monitoring the breaker operatingtime
• monitoring the fault frequencycounter
Local and RemoteCommunicationsTwo communication ports areavailable; a rear port providingremote communications and a frontport providing localcommunications.
Remote communicationsThe remote communications arebased on RS485 voltage levels.Any of the protocols listed belowcan be chosen at the time ofordering.
Courier/K-BusThe Courier language is a protocolwhich has been developedspecifically for the purpose ofdeveloping generic PC programsthat will, without modification,communicate with any device usingthe Courier language.
ModbusModbus is a master/slave protocol,whereby the master must haveknowledge of the slave’s databasesand addresses. The Modbusimplementation supported by theMiCOM P340 series is RTU mode.
IEC 60870-5-103The relay is compliant with thetransmission protocol defined by thespecification IEC 60870-5-103.The standarised messages based onthe VDEW communication protocolare supported.
DNP 3.0The DNP 3.0 protocol is definedand administered by the DNP UserGroup. The relay operates as aDNP 3.0 slave and supports subsetlevel 2 of the protocol plus some ofthe features from level 3.
Local communicationsThe front serial communications porthas been designed for use withMiCOM S1, which fully supportsfunctions within the relay byproviding the ability to program thesettings off-line, configure theprogrammable scheme logic, extractand view event, disturbance andfault records, view the measurementinformation dynamically andperform control functions. PAS&Tcan also be used with the localcommunications port.
DiagnosticsAutomatic tests performed includingpower-on diagnostics andcontinuous self-monitoring ensure ahigh degree of reliability. The resultsof the self-test functions are stored in
non-volatile memory. Test featuresavailable on the user interfaceprovide examination of inputquantities, states of the digital inputsand relay outputs. A local monitorport providing digital outputs,selected from a prescribed list ofsignals, including the status ofprotection elements, may be used inconjunction with test equipment.These test signals can also beviewed using the Courier andModbus communications ports.
Hardware DescriptionAll models within the MiCOM P340series include;
• A back-lit liquid crystal display
• 12 LEDs
• An optional IRIG-B port
• An RS232 port
• An RS485 port
• A download/monitor port
• A battery (supervised)
• N/O and N/C watchdogcontacts
• Supervised +48V field voltage
• 1A/5A dual rated CTs
The hardware variations betweenthe P342 and P343 are:
P342 P343
100 – 120V or380 – 480V VTs 4 4
CTs 5 8
Optically isolatedinputs 8 16
Relay output 3N/O 6N/O4C/O 8C/O
RTDs 10 10
The optically isolated inputs, relayoutputs and 8 of the LEDs arepreconfigured as a default, but maybe programmed by the user.The optically isolated inputs areindependent and may be poweredfrom the +48V field voltage.The relay outputs may be configuredas latching or self reset. All CTconnections have integral shorting.
A system overview of the MiCOMP343 is shown in Figure 4.
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Figure 4: MiCOM P343 system overview(not intended for wiring purposes, refer to external connection diagram 10 P343 01 for connection details)
E1
E2
E3
5A
1A
IA(2)
50P 50N 51P
51N 67N64 46
50BF
See note 1
Watchdog
IRIG-B
RS232
RS485
Measurements
kA, kV, HzkW, kVA, kVArskWh, kVArhSequence componentsThermal stateTemperature
1 4 0 0
250Eventrecords
IN > 1 Start ON
20Disturbancerecords
Fault A-B-C 15msIa = 1000 AIb = 1000 AIc = 1000 A
Programmable scheme logic
Breakermonitoring
No. trips = 100SUM I2 = 1000 kACB opt time = 100 ms
5Faultreports
52
+
+
Courier
CourierModbusIEC60870-5-103LEDs
See note 2
00:12:00 01/01/99
00:12:01 01/01/99Trip A B C ON
+
D2D1D4D3D6D5D8D7D10D9D12D11D14D13D16D15
F2F1F4F3F6F5F8F7F10F9F12F11F14F13F16F15
RL7
RL6
RL5
RL4
RL3
RL2
RL1
User programmble
J8J10
48V field voltage
J7J9 48V field voltage
J14J13J12J11 Relay failed
Relay healthy
H1H2H3H4H5H6H7H8H9H10H11H12H13H14H15H16H17H18
Auxiliary voltage
See note 3
J2
J1
& &1
1
CTS
C23
C24
L1 Setting group
L2 Setting group
L3 Block IN>2
L4 BlockI>2
L5 Reset
L6 Ext prot trip
L7 52a
L8 52b
L9 Not used
L10 Not used
L11 Not used
L12 Not used
L13 Not used
L14 Not used
L15 Not used
L16 Not used
Userprogrammable(defaults shown)
Userprogrammable(defaults shown)
Userprogrammable(defaults shown)
R1 Trip CB
R2 Trip PrimeMov
R3 Any trip
R4 General alarm
R5 CB fail
R6 E/F trip
R7 Volt trip
ANSI NumbersInstantaneous phase overcurrentInstantaneous neutral overcurrentTime delayed phase overcurrentTime delayed neutral overcurrentSensitive earth fault/restricted earth faultNegative phase sequenceBreaker failure and backtripCurrent transformer supervision
50P50N51P51N67N/644650BFCTS
Voltage controlled overcurrentUnderimpedance100% stator earth faultUndervoltageOvervoltageOver/underfrequencyReverse/low forward/over powerOverfluxing
51V2127TN2759813224
Note 1: All CT connectors have integral shorting.These contacts are made before the internalCT circuits are disconnected.
Note 2: 1A CT connections shown.
Note 3: The bridge rectifier is not present on the24 – 48V dc version.
RL14
RL13
RL12
RL11
RL10
RL9
RL8 G1G2G3G4G5G6G7G8G9G10G11G12G13G14G15G16G17G18
Userprogrammable(defaults shown)
R8 Freq trip
R9 Diff trip
R10 SysBack trip
R11 NPS trip
R12 FFail trip
R13 Power trip
R14 V/Hz trip
B1B2B3
RTD 1
B28B29B30
RTD 10
Optional10 RTDs
49T
38
26
Timesynchronisation
87G
27 59 81
51V 21
32
27TN
24 40
5027 VTS 59N
E4
E5
E6
5A
1A
IB(2)
E7
E8
E9
5A
1A
IC(2)
C13
C14
C15
5A
1AINSensitive
C22
C19
C20
C21
C1
C2
C3
5A
1AC4
C5
C6
5A
1AC7
C8
C9
5A
1A
C10
C11
C12
5A
1A
VN
VA
VB
VC
IA
IB
IC
Loss of fieldUnintentional energisation at standstillVoltage transformer supervisionGenerator differentialResidual overvoltageField winding temperatureBecering temperatureStator winding temperature
4050/27VTS87G59N263849
J17
J18
8
User InterfaceThe front panel user interfacecomprises:
(1) A 2 x 16 character back-litliquid crystal display.
(2) Four fixed function LEDs.
(3) Eight user programmable LEDs.
(4) Menu navigation and data entrykeys.
(5) “READ” and “CLEAR” Ckeys for viewing andacknowledging alarms.
(6) An upper cover identifying theproduct name. The cover maybe raised to provide access tothe product model number,serial number and ratings.
(7) A lower cover concealing thefront RS232 port, down load/monitor port and batterycompartment. The front of thecover can display the name ofthe product or any user definedname.
(8) Facility for fitting a security leadseal.
The user interface and menu text areavailable in English, French,German and Spanish as standard.Labels supplied with the deviceallow customised descriptions of theLEDs. A user selectable defaultdisplay provides measurementinformation, time/date, protectionfunctions and plant referenceinformation. The ability to customisethe menu text and alarmdescriptions is also supported.
Password protectionPassword protection may beindependently applied to the frontuser interface, front communicationsport and rear communications port.Two levels of password protectionare available providing access tothe controls and settingsrespectively.
Protection SettingRangesGenerator differentialMode Percentage bias/
high impedance
Is1 0.05In to 0.5In
k1 0 to 20%
Is2 1In to 5In
k2 20 to 150%
100% stator earth fault• 3rd harmonic undervoltage
0.3 to 20V (100 – 120V)1.2 to 80V (380 – 480V)
• Vph-ph< inhibit
30 to 120V (100 – 120V)120 to 480V (380 – 480V)
Unintentional energisation atstandstill• I> 0.08 to 4In
• Vph-ph<10 to 120V (100 – 120V)40 to 480V (380 – 480V)
• Definite time 0 to 10s
• Drop-off timer 0 to 10s
Figure 5: User interface
61
3
5
4
87
2
9
Figure 6: IEC and IEEE/ANSI IDMT curves
UK LTI
IEC SI
IEC VI
IEC EI
1000
100
10
1
0.1100101
Current (Multiples of Is)
Ope
ratin
gtim
e (s
)
IEEE MIIEEE VI
IEEE EIUS CO8
US CO2
100101
Current (Multiples of Is)
0.1
1
10
100
Ope
ratin
gtim
e (s
)
TMS 0.025 to 1.2 TD 0.5 to 15
IEC/UK curvesTMS = 1
IEEE/US curvesTD = 7
IEC Standard inverse t = TMS x
IEC Very inverse t = TMS x
IEC Extremely inverse t = TMS x
UK Long time inverse t = TMS x
IEEE Moderately inverse
t =0.0515
(IIs -1)0.02
TD7
x + 0.114
IEEE Very inverse
IEEE Extremely inverse
US CO8 Inverse
US CO2 Short timeinverse
t =19.61
(IIs -1)2
TD7
x + 0.491
t =28.2
(IIs -1)2
TD7
x + 0.1217
t =5.95
(IIs -1)2
TD7
x + 0.18
t =0.02394
(IIs -1)0.02
TD7
x + 0.01694
0.14
(IIs -1)0.02
13.5
(IIs -1)
80
(IIs -1)2
120
(IIs -1)
10
Phase faultIDMT/definitetime stages 0.08 to 4.0In
Definite time stages 0.08 to 10In
Definite time 0 to 100s
Standard earth faultIDMT and definitetime stages 0.02 to 4.0In
Definite time stages 0.02 to 10In
Definite time 0 to 200s
Sensitive earth faultIDMT/definitetime stages 0.005 to 0.1In
Definite time stages 0.005 to 0.8In
Definite time 0 to 200s
Wattmetric characteristic• Power threshold (1A)
0 to 20W (100 – 120V)0 to 80W (380 – 480V)
• Power threshold (5A)
0 to 100W (100 – 120V)0 to 400W (380 – 480V)
The IEC and IEEE/ANSI IDMTcurves for the above protectionsettings are shown in Figure 6.
Voltage dependentovercurrentOperatingmode Voltage controlled/
voltage restrained
Currentthreshold 0.8 to 4In
Definite time 0 to 100s
K factor 0.25 to 1.00
TMS 0.025 to 1.2
Reverse power/low forwardpower• 4W to 40W
(In = 1A, Vn = 100 – 120V)
• 16W to 160W(In = 1A, Vn = 380 – 480V)
• 20W to 200W(In = 5A, Vn = 100 – 120V)
• 80W to 800W(In = 5A, Vn = 380 – 480V)
• Time settings
Definite time 0 to 100s
DO timer 0 to 100s
Overpower• 4W to 300W
(In = 1A, Vn = 100 – 120V)
• 16W to 1200W(In = 1A, Vn = 380 – 480V)
• 20W to 1500W(In = 5A, Vn = 100 – 120V)
• 80W to 6000W(In = 1A, Vn = 380 – 480V)
• Time settings
Definite time 0 to 100s
Drop-off timer 0 to 100s
Loss of fieldMho characteristic settings(secondary ohms)
Mho offset
0 to 40/InΩ (100 – 120V)
0 to 160/InΩ (380 – 480V)
Diameter
25/In to 325/InΩ (100 – 120V)
100/In to 1300/InΩ (380 – 480V)
Linear characteristic 15° to 75°
Time delays 0 to 100s
Negative phase sequencethermalAlarm 0.03 to 0.5In
t> 0 to 100s
Trip 0.05 to 0.5In
k 2 to 40s
tmax 500 to 2000s
tmin 0 to 100s
• Vs (Voltage controlled)Vs1, Vs2 (Voltage restrained)20 to 120V (Vn 100 – 120V)80 to 480V (Vn 380 – 480V)
Underimpedance• Z< 2 to 120Ω
(Vn 100 – 120V, In 1A)
0.4 to 24Ω(Vn 100 – 120V, In 5A)
8 to 480Ω(Vn 380 – 480V, In 1A)
1.6 to 96Ω(Vn 380 – 480V, In 5A)
• Definite time 0 to 100s
Undervoltage• Voltage settings, Vs
10 to 120V (100 – 120V)
80 to 480V (Vn 380 – 480V)
• Time settings
Definite time 0 to 100s
IDMT t = k/(1 – V/Vs)
k 0.5 to 100
Overvoltage• Voltage settings, Vs
60 to 185V (100 – 120V)
240 to 740V (Vn 380 – 480V)
• Time settings
Definite time 0 to 100s
IDMT t = k/(V/Vs – 1)
k 0.5 to 100
Residual overvoltage• Voltage settings, Vs
1 to 50V (100 – 120V)
4 to 200V (Vn 380 – 480V)
• Time settings
Definite time 0 to 100s
IDMT t = k/(V/Vs – 1)
k 0.5 to 100
Under and overfrequency• Frequency settings 45 to 65Hz
• Time settings 0 to 100s
Biased differential/restrictedearth fault
DIFFI
BIASIs2I
s1IK1
K2
Trip
No trip
11
Overfluxing (V/Hz)• V/Hz trip and alarm
1.5 to 3.5V/Hz (100 – 120V)
6.0 to 14V/Hz (380 – 480V)
• TMS (trip) 1 to 63
• DT (trip and alarm) 0 to 100s
Resistive temperaturedetectors (RTDs)• RTD alarm temperature
0 to 200°C
• RTD trip temperature 0 to 200°C
• Alarm and trip timedelays 0 to 100s
Technical DataRatings
Inputs:• AC current (In)
1A/5A dual rated ac rms
• AC voltage (Vn)100 – 120V or 380 – 480V rmsnominal phase-phase
• Rated frequency 50/60Hz
• Operative range 5 to 70Hz
• Auxiliary voltage (Vx)
Nominal Operative range (V)(V)dc dc ac
24 – 54 19 – 65 –48 – 110 37 – 150 24 – 110110 – 250 87 – 300 80 – 265
Outputs:• Field voltage supply
48V dc (current limit: 112mA)
Burdens• DC auxiliary voltage
10W typical (P342)
12W typical (P343)
• AC auxiliary voltage10W typical (P342)
12W typical (P343)
• Optically isolated inputs0.24W per input at 48V
• Nominal voltage circuitVn 110 – 120V <0.02VA at 110VVn 380 – 440V <0.1VA at 440V
• Nominal current circuitPhase and neutral<0.1Ω at 1A<0.02Ω at 5A
Thermal withstand• AC current inputs
4.0In continuous30In for 10s100In for 1s
• AC voltage inputs
2 Vn continuous2.6 Vn for10s
Current transformerrequirementsThe following CT requirements arebased on a maximum prospectivefault current of 50In and the relayhaving a maximum high set settingof 25In. The CT requirements aredesigned to provide operation of:
• Phase and standard earth faultelements
1A rated currrent circuits2.5VA 10P 205A rated current circuits7.5VA 10P 20
• For generator differentialprotection:
Low impedance diffVk > 50In(Rct + 2RL)
High impedance diff Vk > 2 Vswhere Vs = 1.5If (Rct + 2RL)
Digital inputs• Optically isolated inputs may be
energised from the supervised48V field voltage provided or anexternal battery.
• Operating voltage >30V dc• Max. input voltage 60V dc• AC immunity 50V rms
Contacts• Contact ratings:
Make: 30A and carry for 3sCarry: 5A continuousBreak: dc 50W resistive
25W inductive(L/R = 40ms)
ac 1250VA resistive
ac 1250VA inductive(P.F. = 0.7)
Subject to maxima of 5A and300V
• Watchdog contact ratingsdc 30W resistivedc 15W inductive
(L/R = 40ms)ac 375VA inductive
(P.F. = 0.5)• Durability:
Loaded contact10,000 operations minimum
Unloaded contact100,000 operations minimum
Rear communications port• Connection
Multidrop (32 units)
• Cable typeScreened twisted pair
• Cable length 1000m max
• Connector Screw terminals
• Signal levels RS485
• Isolation SELV
• Remote access
Protocols supported• Courier
• Modbus
• IEC 60870-5-103• DNP 3.0Note: An interface to an optical
fibre, type 850nm, BFOC2.5 connector is availablefor IEC 60870-5-103.
Front communications port• Connection Point to point
• Cable type Multi-core
• Cable length 15m max
• Connector RS232 DTE9 pin D-type female
• Protocol Courier
• Isolation ELV
• Local access
IRIG-B Port• Carrier signal
Amplitude modulated
• Cable type50 ohm coaxial cable
• Connection BNC
• Isolation SELV
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IEC 60255-22-2: 1996 Class 3
8kV discharge in air to allcommunication ports. 6kV pointcontact discharge to any part ofthe front of the product.
• Surge immunity
IEC 61000-4-5: 1995 Level 4
4kV peak, 1.2/50µs between allgroups and case earth.
2kV peak, 1.2/50µs betweenterminals of each group.
Excluding the RS232 anddownload/monitor ports
• EMC compliance
89/336/EEC
Compliance to the EuropeanCommission Directive on EMC isclaimed via the TechnicalConstruction File route.
Generic Standards were used toestablish conformity:
EN50081-2: 1994
EN50082-2: 1995
• Product safety
73/23/EEC
Compliance with EuropeanCommission Low VoltageDirective.
Compliance is demonstrated byreference to generic safetystandards:
EN61010-1: 1993/A2: 1995
EN60950: 1992/A11: 1997
Atmospheric environment• Temperature
IEC 60255-6:1988
Operating –25°C to +55°C
Storage and transit–25°C to +70°C
IEC 60068-2-1: 1990/A2:1994
Cold
IEC 60068-2-2: 1974/A2:1994
Dry heat
• Humidity
IEC 60068-2-3: 1969
56 days at 93% RH and +40°C
Internal battery• Battery type: 1/2AA, 3.6V
Download/monitor portThis is a 25 pin D-type femaleconnector located on the front userinterface and is specificallydesigned for test purposes andsoftware download.
• Isolation ELV
• Local access
High voltage withstand• Dielectric withstand
IEC 60255-5: 1977
2kV rms for 1 minute between allcase terminals connected togetherand the case earth.
2kV rms for 1 minute between allterminals of independent circuitswith terminals on eachindependent circuit connectedtogether.
ANSI/IEEE C37.90-1989(r1994)
1kV rms for 1 minute across theopen contacts of the watchdogrelays.
1kV rms for 1 minute across opencontacts of changeover outputrelays.
1.5kV rms for 1 minute acrossopen contacts of normally openoutput relays.
• High voltage impulse
IEC 60255-5: 1977
Three positive and three negativeimpulses of 5kV peak, 1.2/50µs,0.5J between all terminals and allterminals and case earth.
This is not applicable to theRS232 and download/monitorports.
Electrical environment• DC supply interruption
IEC 60255-11: 1979
The unit will withstand a 20msinterruption in the auxiliarysupply, in its quiescent state,without de-energising.
• AC ripple on dc supply
IEC 60255-11: 1979
The unit will withstand a 12% acripple on the dc supply.
• AC voltage dips and shortinterruptions
IEC 61000-4-11: 1994
20ms interruptions/dips.
• High frequency disturbance
IEC 60255-22-1: 1988 Class III
At 1MHz, for 2s with 200Ωsource impedance:
2.5kV peak between independentcircuits and independent circuitsand case earth.
1.0kV peak across terminals ofthe same circuit.
Excluding the RS232 anddownload/monitor ports
• Fast transient disturbance
IEC 60255-22-4 : 1992 Class IV
4kV, 2.5kHz applied directly toauxiliary supply
4kV, 2.5kHz applied to all inputs.
Excluding the RS232 anddownload/monitor ports
• Surge withstand capability
IEEE/ANSI C37.90.1 (1989)
4kV fast transient and 2.5kVoscillatory applied directly acrosseach output contact, opticallyisolated input, power supplycircuit, RS485, IRIG-B, VT and CTcircuits
• Radiated immunity
C37.90.2: 1995
25MHz to 1000MHz, zero and100% square wave modulated.Field strength of 35V/m.
• Electrostatic discharge
IEC 60255-22-2: 1996 Class 4
15kV discharge in air to userinterface, display and exposedmetal work.
13
• Enclosure protection
IEC 60529: 1989
IP52 Protection (front panel)against dust and dripping waterat 15° to the vertical.
Mechanical environment• Vibration
IEC 60255-21-1: 1996
Response Class 2
Endurance Class 2
• Shock and bump
IEC 60255-21-2: 1995
Shock response Class 2
Shock withstand Class 1
Bump Class 1
• Seismic
IEC 60255-21-3: 1995 Class 2
CasesP342 MiCOM 40TE
P343 MICOM 60TE
• Weight
P342 7.9 kg
P343 11.5 kg
Additional InformationTechnical Guide TG8617
Operation Guide OG8617
Courier Communications R4113
MiCOM S1 User Manual R8610
Midos Parts Catalogueand Assembly Instructions R7012
CaseThe MiCOM relays are housed in aspecially designed case providing ahigh density of functionality withinthe product, a customisable userinterface, and additional functions/information concealed by upper andlower covers. Physical protection ofthe front panel user interface andprevention of casual access isprovided by an optional transparentfront cover, which can be fitted oromitted according to choice sincethe front panel has been designedto IP52 protection against dust andwater. The case is suitable for eitherrack or panel mounting as shown inFigures 7 and 8.
23.30 155.40
181.30202.00
10.35
159.00 168.00
8 off holes Dia. 3.4
A B B A
A B B A
Flush mounting panel
Note: If mounting plateis required use flushmounting cut out dimensions
200.00
All dimensions in mm
Front view
177.00
206.00 30.00 Side view
240.00Incl. wiring
Secondary cover (when fitted)
157.5 max
177.0(4U)
483 (19” rack)
Sealing strip
Panel cut-out detailA = Clearance holesB = Mounting holes
Figure 7: Case sizes P342 (40TE)
Figure 8: Case size P343 (60TE)
A Clearance holesB Mounting holes
30.00 Side view
240.00Incl. wiring
Secondary cover (when fitted)
157.5 max
23.25
159.00
10.30
168.
00
177.00
Front view
116.55 142.45
155.40 129.50305.50
A B A B B A
A B B AB A
12 off holes Dia. 3.4
303.50
309.60
177.0(4U)
483 (19” rack)
Sealingstrip
All dimensions in mm
14
MiCOM P342/P343SpecificationAn integrated generator protectionsolution shall providecomprehensive protection againstphase and earth faults andabnormal voltage, frequency,power, field failure and overfluxingconditions.
Specific protection functions shallinclude; overcurrent, standard,sensitive and restricted earth faults,(100% stator earth fault), neutraldisplacement, voltage dependentovercurrent, under and overvoltage,under and overfrequency, reversepower/low forward power/overpower, loss of field, negative phasesequence thermal, overfluxing,(unintentional energisation atstandstill) and (generatordifferential) protections, as well as10 temperature measuring pointsusing RTDs
Two stages of phase overcurrentand earth fault protection shall beprovided, with a selection of nineIDMT characteristics for one of thestages. An additional CT shall beprovided for sensitive and restrictedearth fault protection. It shall bepossible to set the power element forunder power or reverse power aswell as for over power. It shall bepossible to configure the loss of fieldprotection in such a way that it canbe used for pole slipping protection.
Accessories Please quote on order
Rack frame, (in accordance with IEC 60297). FX0021 001
Case to rack sealing gaskets are available to improve the overall IPrating of the panel, (10 per order). GN2044 001
M4 90° pre-insulated ring terminals:Blue – Wire size 1.04 to 2.63mm2 (100 per order) ZB9124 900Red – Wire size 0.25 to 1.65mm2 (100 per order) ZB9124 901
Secondary cover: P342 Size 40TE GN0037 001P343 Size 60TE GN0038 001
Blanking plates: Size 10TE GJ2028 002Size 20TE GJ2028 004Size 30TE GJ2028 006Size 40TE GJ2028 008
Programming of the device shall bepossible using a front panel userinterface, local and remotecommunications ports.A configuration feature shall beprovided to enable selection ofrequired functions. This shall allowmenu customisation, removingunwanted functions and settingsgroups from the settings displays.The front panel user interface shallprovide independent keys for theviewing and acknowledgement ofalarms.
Fixed and programmable schemelogic shall be provided uploadablefrom relay to PC and PC to relay.
The relay shall store factory defaultprotection and scheme logic settingsfor restoration or upload to a PC.
Time-tagged event, fault anddisturbance records shall be storedin non-volatile memory. The internaldisturbance recorder shall have acapacity to store 20 records, eachrecord shall store sampled datafrom 8 analogue and 32 digitalchannels over a period of 10seconds.
The vendor shall be able to providesoftware support for local andremote programming, andextraction of records from thedevice.
A comprehensive range ofinstantaneous and integratedmeasurement values shall beavailable for viewing on the userinterface and the communicationsports. These values shall include thetemperature measurements that aretaken from the ten monitoringpoints.
Note: The functions in bracketsshould be included if theP343 is required andexcluded for the P342.
15
Generator Protection Relay
Version
Generator protectionGenerator protection with differential protectionand 100% stator earth fault
2
3
Vx aux rating
24 – 48V dc48 – 110V dc (30 – 100V ac)110 – 250V dc (100 – 240V ac)
Vn rating
100 – 120V ac380 – 480V ac
Hardware options
Standard versionIRIG-B inputFibre optic converter (IEC 60870-5-103)IRIG-B input & fibre optic converter (IEC 60870-5-103)
123
12
1234
Protocol options
K-BusModbusIEC 60870-5-103 (VDEW)DNP 3.0
1234
Relay type MiCOM P 43
Product specific
No resistive temperature devices10 resistive temperature devices
AB
Information Required with Order
Your contact:
TRANSMISSION & DISTRIBUTION Protection & Control, HQ, 60 Route de Sartrouville, BP58, 78230 Le Pecq Cedex, FranceTel: +33 (0) 134 80 79 00 Fax: +33 (0) 134 80 79 13 Email: [email protected] Internet: www.alstom.com
©2000 ALSTOM. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM.Other names mentioned, registered or not, are the property of their respective companies.
Our policy is one of continuous development. Accordingly the design of our products may change at any time. Whilst every effort is made to produce up to date literature, this brochure shouldonly be regarded as a guide and is intended for information purposes only. Its contents do not constitute an offer for sale or advice on the application of any product referred to in it.
We cannot be held responsible for any reliance on any decisions taken on its contents without specific advice.
Publication R6614B 120030 CPS Printed in England.