generator protection relay setting calculation

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1,502 views Sep 2, 2020 Generator Protection Sample Relay Setting Calculations - The sample calculations shown here illustrate steps involved in calculating the relay settings for g. 2Time delay Reverse Power Protection32G t1 = 5s (32G ) t 2 = 60s(32G ) Low Forward Power Protection37G t = 1s (37G ) 3Output model Reverse Power Protection32G: Time delay t1 : Alarm Time delay t 2 : Trip All CBs Low Forward Power Protection37G: Trip All CBs 7. Relay setting engineers develop the settings and produce a settings report and settings files that are to be loaded into the digital relays. HV Side Generator terminal A.T. HV Side Rated VoltagekV 230 13.8 13.8 Rated CurrentA 452.4 7539.6 7539.6 CT ratio 1000/1 8000/5 8000/5 Second side CurrentA 0.45 4.71 4.71 2.2 Setting Calculation 1Min operation current I op .0 Setting by the max unbalanced current under the condition of avoid the normal main transformer rated load. I op.0 = K rel (f i ( n ) + U + m)I b = 1.5 (0.06 + 0.05 + 0.05) I b = 0.24 I b Suggest to select I op .0 = 0.5 I b b Therein I b is the value of rated current of transformer norm side converted to the TA secondary side. Relay Settings Calculations - Electrical Engineering min 1.45 = = 2.19 > 1.5 0.661 I op 5Setting of second harmonic braking coefficient Suggest to select: 15% 6Difference current quick brake Select: I op = 5 I b 7Difference current quick brake sensitivity check Sensitivity check principle : Main transformer low-voltage side of two-phase metallic short-circuit occurs: Ik = 0.866 S b 0.866 100000 = = 5.08 A X //( X S + X T ) 3 230 nTA 0.08 //(0.022 + 0.07) 3 230 1000 ,, d K sen = Ik 5.08 = = 2.26 > 1.2 I op 2.25 8Output model: Trip all CBs 3. All rights reserved. min generally be set by the operation current in correspondent with specified delay lower limit I op . Generator relay protection setting calculation instruction endstream endobj startxref Sorry, preview is currently unavailable. Other methodologies and techniques may be applied to calculate relay settings based on specific applications. Otherwise, the field could not be used. Back Up Impedance21G18 20. 1 + 0 . Generator Protection Setting Calculations 10.015.040.0COLD AIR TEMPERATURE ( C)13.813.813.8RATED VOLTAGE (kV) 6.4856.2765.230STATOR CURRENT (kA) 0.85 / 600.85 / 600.85 / 60POWER FACTOR / FREQUENCY (HZ) 131.7127.5106.2ACTIVE POWER (MW) 155.0150.0125.0APPARENT POWER (MVA) CURVE B @ 10.0 C CURVE A @ 15.0 C RATED @ 40.0 C DESCRIPTIONS Relay Setting Calculation. Generator Protection Calculations Settings | PDF | Relay - Scribd 13.8 3. min = I k . The SEL-700GT provides an IEEE 1547-compliant intertie protection solution for distributed generation. Generator Protection Setting Calculations 10.015.040.0COLD AIR TEMPERATURE ( C)13.813.813.8RATED VOLTAGE (kV) 6.4856.2765.230STATOR CURRENT (kA) 0.85 / 600.85 / 600.85 / 60POWER FACTOR / FREQUENCY (HZ) 131.7127.5106.2ACTIVE POWER (MW) 155.0150.0125.0APPARENT POWER (MVA) CURVE B @ 10.0 C CURVE A @ 15.0 C RATED @ 40.0 C DESCRIPTIONS All Generator Protection Detailed explantion Generators are very sensitive equipment, we should protect the generatorin this we have given around 86 number of relays and its detained explanation.. SOTF Relay Working Principle - Switch On To Fault protection CT Supervision Relay Working Principle In the examples, when comparing generator voltage protection trip settings against the PRC-024-2 Voltage Ride-Through Time Duration Curve, it is important to keep in mind that the curve is defining a no trip area within the curve. POWER- LINKER P O W ER E N G I N EE R IN G T R A I N I N G C O URSE ON The generator protection system design takes into account the types of faults and abnormal operating conditions that could be present at the generating plant and provide means for detecting and acting upon these conditions. Generator 95% Voltage Check59GB 18.1 Basic parameter rated secondary voltage U gn 2 110V 18.2 Setting Calculation 1Operation voltage U op = 0.95U gn 2 = 0.95 110 = 104V 2output model: Alarm 19. Once the field is used and the 59P operates, the 27-3N protection is enabled. PROTECTION SETTING FOR GENERATOR - Electrical Engineering-Keep Reading Academia.edu uses cookies to personalize content, tailor ads and improve the user experience. Learn how we and our ad partner Google, collect and use data. Generator Pole Slipping78G . 11 10. Academia.edu no longer supports Internet Explorer. Generator protection distance, volts per hertz, under/over voltage, reverse power, loss of excitation, phase overcurrent, negative sequence overcurrent, stator ground, out of step and differential. Education (Diploma): University Relevant Experience: SEL relay commissioning, Generator commissioning Qualifications\Certification: Bachelor in Electrical Engineering Skills: Communication Skills, Good communicator - effectively communicate at all levels and on complex topics Technical Skills: Protection software: MiCOM S1, MiCOM Studio, DIGSI 4.83, CAP316, CAP 505, CAP540, XSWin1_3, PCM 600 . PROTECTION SETTING FOR GENERATOR 1. Solutions - Protection - Generator | Beckwith Electric Generator protection relay setting calculation Jobs, Employment 5 0 . . 05 ) 1 . Search for jobs related to Generator protection philosophy and relay settings calculations or hire on the world's largest freelancing marketplace with 21m+ jobs. %PDF-1.6 % max three phase metal short circuit at generator side can be set by the condition of I op. Back Up Impedance21G Based on actual engineering experience, this protection is valueless ,we suggest dont use it. Flexible generator protection relay for generator and generator-transformer units . Genertor Protection Functions and Test Methods max = I k( 3. max = 32.69 A The max unbalanced current of differential protection when the generator is outer short circuit ) I unb. m is the error caused due to the incomplete matching of transformer ratios of TA and TAA, m takes 0.05 in general. 1 Basic parameter Name M.T. Generator Inter-turn Fault95G ..6 4.Generator Inadvertent Energize protectionStator Earth Fault Protection of startup condition 99V .7 5. Generator Protection Relays - EGR 5000| Eaton TOver Current Earth Fault Relay Calculation30 10 12 - Academia.edu , Relay setting Calculation Base MVA=100 Fault MVA=1200 Source impedance=0.083 Cable impedance=.015*4=0.06 ohm Transformer, GENERATOR ROOM VENTILATION CALCULATION Generator capacity max = t max = I Ign 2 4.41 = = 32.7 A X d" 0.135 2 op . Generator Differential Protection87G 1.1 Basic parameter CT ratio nTA rated primary current 8000/5 I gn1 rated secondary current I gn 2 7060A I gn1 7060 I = = = 4.41A gn 2 nTA 1600 1.2 Setting calculation 1Min operation current I op.0 Setting by the max unbalanced current under the condition of avoid the normal generator rated load. min = 14.15 A 2 I op = I op.0 + S ( I res I res.0 ) = 1.324 + 0.3 (14.15 3.53) = 4.51A K sen = I k . min 1.54 0.71 set = 180 2arctg = 180 0 2arctg = 180 0 2 68.50 = 430 X st+X d 0.163 + 0.267 Suggest to select set = 120 0 5Tripping blocking current setting This protection use generator neutral CT, CT ratio is 8000/5Main transformer high side circuit breaker rated breaking current is 40kA I set = 0.5 40000 230 = 208A 1600 13.8 Suggest to select I set = 180 A 6Slipper times setting Outer zoneSlipper times setting:N =4 Inner zone, Slipper times setting:N =1#1Generator2#2 Generator3#3 Generator4#4 Generator 7Reactance line position Z C Z C = 0.9 X t 2 = 0.9 1.53 = 1.377() 8Startup current I st = 1.2 I n 2 = 1.2 4.41 = 5.3( A) 9Time delay Outer zone :0.5s Inner zone :0.1s 10Output model Outer zone :Alarm Inner zone :Trip all CBs 10. 10 8.2 Setting calculation 1Time specified overload The negative-sequence time specified over-load should be set on the condition of under the generator long term allowed negative-sequence current I 2 can reliable return I op = K rel Therein I 2 Ign 2 Kr = 1.05 0.08 4.41 = 0.39 A 0.95 K rel is the reliable coefficient select 1.05 K r is the return coefficient select 0.850.95 I 2 is the per-unit value of generator long term allowed negative-sequence current Time specified overload time delay: t = 5s 2Reverse time specified overload The reverse time specified negative-sequence over-load was confirmed by the allowed negative-sequence over-current ability of the generator rotor surface. Our partners will collect data and use cookies for ad targeting and measurement. Generator protection philosophy and relay settings calculations Jobs 05 + 0 . Overcurrent and earth fault relay is normally used to protect transmission lines, distribution lines, transformers and bus coupler etc. max* K 37.5 = 0.7 s = 2 (1 + ) 55.1 (1 + 0.01) 4.41 4Output model Time specified overload: Alarm Reverse time specified overload: Programming Trip 8. U op = 2V. %%EOF Generator loss of excitation protection, 13, .14, ..15, 16, ..16, ..17, .17, .18, ..18, 18, ..19, Setting by the max unbalanced current under the condition of avoid the normal. PDF Fundamentals of Generator Protection - Sprawls 674 = 0 . Stator Earth Fault 100%64G2 ..17 16. Ronald F. Clayton This relay is not sensitive for single line to earth faults as the earth fault current is limited due to the high neutral earthing resistance. The relation of allowed duration time is : t= K I (1+ ) 2 * ThereinK is the allowed heat time constant of stator windingit should be based on the parameter provided by the motor manufacturer I * is the per-unit value based on stator rated current is the heat radiation constant and related to the stator winding temperature rising and temperature margingenerally select 0.01~0.02. max = (1 1 . K rel is the reliable coefficient K rel = 1.3 ~ 1.5 f i( n ) is the transformer ratio error of the current transformer under rated current. Generator Protection Sample Relay Setting Calculations - The sample calculations shown here illustrate steps involved in calculating the relay settings for . to the named unit (ohm)value with the generator side voltage is 13.8kV. ' Adding the optional neutral voltage connection to the SEL-700G provides 100 percent stator ground . Generator Protection Setting Calculations X T = 10% 0 Reverse Power Protection32G; Low Forward Power Protection37G .8 7. Our experience in the development of relay settings includes the following: Breaker control breaker failure, sync check and reclosing. generator protection relay setting calculation - VDOCUMENTS Generator Protection | Relay Setting Calculations | Power System The setting value applied in the project should avoid the max zero-sequence unbalance voltage that transmitted to the generator side when system HV side and plant transformer LV side earthing short circuit. U op = 2V 2) Fault branch negative-sequence direction elements i = 3% I gn 2 = 3% 4.41 = 0.13 A u = 1%U gn 2 = 1% 110 / 3 = 0.63V p = 0.1% Pgn nTV nTA = 0.1% 3 I gn 2 U gn 2 = 0.1% 3 4.41 100 = 0.76VA 3) Time delay t = 0.1s 4Output model: Trip All CBs 4.Generator Inadvertent Energize protectionStator Earth Fault Protection of startup condition99V 4.1 Basic parameter Rated secondary current I gn 2 4.41A Rated secondary voltage U gn 2 110V 4.2 Setting calculation 1Low impedance element setting Z set = 0.8U gn 2 3 0.3I gn 2 = 0.8 110 3 0.3 4.41 = 38.4( ) Rset = 0.85Z set = 0.85 38.4 = 32.6( ) 2Over current element setting I op = 0.3I gn 2 = 0.3 4.41 = 1.32( A ) 3Stator Earth Fault Protection of startup condition operation voltage U op = 10V Time delay t = 2 s 4Output model Generator Inadvertent Energize protection: Trip 220kV CB & excitation CB Stator Earth Fault Protection of startup condition: Trip excitation CBs 5. Generator Over-voltage59G 5.1 Basic parameter Rated secondary voltage U gn 2 110V 5.2 Setting Calculation 1Operation voltage I: U op = 1.05U gn 2 = 1.05 110 = 115 .5V II: U op = 1.1U gn 2 = 1.1 110 = 121V III: U op = 1.2U gn 2 = 1.2 110 = 132V 2Time delay Select t = 30 s I: II: t = 10 s III: t = 0.5s 3Output model: Trip all CBs 6. Generator Inter-turn Fault95G 3.1 Basic parameter Rated secondary current I gn 2 I gn 2 = PT ratio nTV I gn1 nTA 13.8 3 = 7060 = 4.41A 1600 0.1 0.1 3 3 3.2 Setting Calculation 1Zero-sequence Voltage Setting by the max unbalanced zero-sequence voltage under the condition of avoid the normal generator rated load. Lightning Protection Calculation - Building 911 ANNUAL THREAT OF OCCURANCE, FROM NFPA 780 2011 APPENDIX L6.6, MP-3000 Motor Protection Relay INSTRUCTION LEAFLET FOR INSTALLATION, OPERATION AND MAINTENANCE OF THE CUTLER-HAMMER MP-3, GROUP Common practice. Overload relay setting and calculation - Electrical Engineering Centre The practical way of calculating differential protection settings for a Relay (e.g. Means 3I 0 = 0.2 3U gn 3 3Rg + 3RN //( jX C 0 ) IS 0.2 3U gn 3 3Rg .set + 3RN //( jX C 0 ) = IS 0.2 3 13800 3 =1 3Rg .set + 3 2750.8 //( j 6860) R g .set = 5.2k Suggest to select Earthing resistance high value: Rhg .set = 10k Earthing resistance low value: Rlg .set = 5k Time delay: high value time delay:3s low value time delay:0.5s I 50.set = U 2n Rn K I nTA 0 = 0.2 300 = 0 .5 A 1.3 1.1 100 Therein can generally be selected as 20 K I is the reliable coefficient generally select 1.1. Generator 95% Voltage Check59GB ..18 19. The 59P relay needs to be set for min = 0.9U n 0.9 13800 COS = 0.8 = 0.71() 3 1.15I n 3 1.15 7060 1.54 RL. Protection selectivity is partly considered in this report and could be also re-evaluated. Stator Earth Fault 100%64G2 15.1Basic parameter Generator terminal PT ratio Generator neutral PT ratio 13.8 3 0.1 0.1 3 3 13.8 0.1 3 15.2 Setting calculation Setting value by the protection device according to measured data Time delay : 5s 15.3 Output model: Alarm 16. General setting guidelines are not possible. TV Fuse-failure160G ..19 1. Principle ,the low setting value zero-sequence voltage should be set by the max unbalance fundamental wave zero-sequence voltage of neutral single phase voltage transformer when normal operation or three phase voltage transformer open triangle winding at generator side. Eaton's EGR (EGR 5000) generator protection relay has been designed for maximum user flexibility and simplicity, and provides comprehensive protection, metering, and monitoring for generators of any size operating at 50 or 60 Hz. CATHODIC PROTECTION You can download the paper by clicking the button above. Calculation of the Current . min = I gn 2 delay1000s set value of reverse time A 10 + I 22 = 4.41 + 0.08 2 = 0.56 A 1000 1000 Reverse time specified delay upper limit current I op . Generator Differential Protection87G 3 2. Enter the email address you signed up with and we'll email you a reset link. H H V D F AU LT C UR RE NT CA LCU LA TI O NS , R, Generator relay protection setting calculation instruction Instruction: This setting calculation instruction is only for reference, protection device running setting is confirmed by user. generator protection relay setting calculation - VDOCUMENT Generator protection calculations settings - SlideShare min = I res = 0.866 S b 0.866 100000 = = 28.3 A X 3 13.8 nTA 0.08 3 13.8 1600 ,, d I k . Generator Relays Two generator protection relays from two different manufacturers have been chosen to provide redundant protection for the generator. max = ( K st K aper f i + U + m ) I (3) k . 50/27 Inadvertent Energizing The current can be calculated as follows: I = ES/(X2 + XT1 + X1SYS) = 100/(16.4 + 10 + 6.25) = 3.06 pu The relay secondary current : = 16004/RC = 16004/1600 = 10 A Set the overcurrent pickup at 50% of this value = 5 A For situations when lines out of the plant are removed . I op.0 = K rel 2 0.03I gn 2 = 1.5 2 0.03I gn 2 = 0.09 I gn 2 Suggest to select I op.0 = 0.2 I gn 2 2Min brake current I res.0 I res.0 = I gn 2 3Ratio brake coefficient S External three-phase short-circuit the maximum short-circuit current: ) = I k( 3. max Sb 100000 = = 32.69 X 3 13.8 nTA 0.08 3 13.8 1600 ,, d ) I res. U is the error caused due to the regulation of transformer tapping (relative to the percent of the rated voltage). Relay setting Calculation Base MVA=100 Fault MVA=1200 Source impedance=0.083 Cable impedance=.015*4=0.06 ohm Transformer Beckwith Electric's protection relays provide you with the ability to meet or exceed ANSI/IEEE C37.102 or Buff Book standards, plus give you additional operational and security enhancements. 59N - Neutral Overvoltage (Gen) VLL Rating = 13,800 V PRIS IS IS = 3.5 x 13,800 = 201.3A 240 V59N = 0.7 x 201.3 = 140.9V 23. 3660 0 obj <>stream 59P phase overvoltage protection relay shown in Figure 4 supervises the 27-3N protection relay, so that the 86 lockout relay can be reset when the generator is out of operation. Full article: Transformer protection relay calculations - ResearchGate Generator loss of excitation protection40G 13 11. Generator Relay Protection Setting Calculation - VSIP.INFO The modeling of protection relays is required to determine the effects of network parameters and configurations on the operation of these relays. Address: Copyright 2022 VSIP.INFO. To learn more, view ourPrivacy Policy. Transformer protection relay calcul. Field Winding Earth Fault(64F Non-electricaltime delay is setting by the owner 18. Protective Relay Settings and Calculations | Louisiana Engineers Apply Integrated Generator Protection to meet or exceed standards, while providing maintenance and operational information. 87H Unrestrained high-set differential current protection. 3Reverse time specified startup current Reverse time specified startup current I op . Generator Over Fluxing24G ..15 13. Normally for overload relay setting depend on FLA ( Full Load Ampere ) of motor.We can see at the NAMEPLATE of motor.Normally setting for overload is 5% until 10 % more than FLA. Generator Protection Sample Relay Setting Calculations The sample calculations shown here illustrate steps involved in calculating the relay settings for generator protection. This technical article will cover the gathering of information needed to calculate protective relay settings, the setting calculations for the various protective functions, typical generator/turbine withstand times for abnormal operating conditions, and the math associated with various types of impedance elements. Overall Differential87ALL 2. 5vx^5/&xZ?XH| *?~+9Y_EO(*rh|5=`B ZD'Uz:il)^ q_eD`@&-^DaA`SnLi5 ] lJEMHM*QY2v0br 1(V 30Ut@`Qf xt 8 63@4 `0a@U RPP+5 LazH<822LnlrpX Xq-o+sj?9$d}8:$:auR ) IO9t;CS ]-&\~ R3/gA1 ?$f`bd[a%3| ~/r Generator Protection Relay Setting Calculation | PDF - Scribd Generator Relay Protection Setting Calculation | PDF - Scribd A. Generator X d = 0.237 13800 = 0.267( ) 3 7060 Main transformer X t = X k System X s = 7.8 (220 13.8)2 U gn Sn 2 13.8 2 = 0.125 = 0.132( ) 180 = 0.031( ) X st setting of system relation impedance X st = X t + X s = 0.132 + 0.031 = 0.163( ) ' 2Reduce X d X t & X st to the secondary side value of generator side TVTA. Xd ' 2 ' = Xd Xt2 = Xt nTA 1600 = 0.267 = 3 .4 ( ) 125.4 nTV nTA 1600 = 0.132 = 1.68() 125.4 nTV X st 2 = X st nTA 1600 = 0.163 = 2.08() 125.4 nTV 3Setting lens principal axis obliquity Select system impedance angle : z = 85 0 4Setting of operation power angle set R1. C&P Protection Engineer - bolashak.com PDF Generator Protection - CED Engineering Generator earthing and stator earth fault protection | EEP Aug 6, 2018For a relay element with an instantaneous setting, protection is. Ventilating air (cu.m/min.) SEL-700G Generator Protection Relay - Schweitzer Engineering Laboratories Other methodologies and techniques may be applied to calculate relay settings based on specific applications. Field Winding Earth Fault(64F .18 18. Overall Differential87ALL 4 3. Relay Settings Calculations - Electrical Engineering This technical report refers to the electrical protection of all 132kV switchgear. It's free to sign up and bid on jobs. PT ratio nTV 3.2 Setting Calculation 1Zero-sequence Voltage. Checking engineers will review and separately calculate the settings to verify the settings engineers work. 87GD Restricted ground fault protection. min = K C 0I op = 1.05 5.14 = 5.4 A Therein I op is the set value of time specified startup current K C 0 is the matching coefficientselect 1.05 Reverse time specified delay lower limit: t min = 120 s Reverse time specified delay upper limit current I op . endstream endobj 3612 0 obj <. Moreover, these relays can be used as main or backup protection. Setting the generator protective relay functions | EEP hbbd```b``""@$i0DIF 6w4Ru[ These spreadsheets below will make your endless calculations much easier! By using our site, you agree to our collection of information through the use of cookies. Generator Stator Overload49G 7.1 Basic parameter Rated secondary current I gn 2 4.41A allowed heat time constant of stator winding K 37.5 7.2 Setting calculation 1Time specified overload Stator winding time specified over-load can be set by the condition of the long term allowed loading current can reliable return. 3629 0 obj <>/Filter/FlateDecode/ID[<3BA8EBD14C8CC44CA0508639A1C1903A><03A47A9D4BC489428A605897297A9D82>]/Index[3611 50]/Info 3610 0 R/Length 106/Prev 776018/Root 3612 0 R/Size 3661/Type/XRef/W[1 3 1]>>stream Content uploaded . Generator Protection - Setting Calculations Therefore, for a terminal L-G fault, there will be 140.9 V applied to the generator relay neutral voltage input connection. The generator relay details are: Beckwith Electric Company M3425A Model Number = M3425A#8736 Frequency = 60Hz Output Contacts = 23 Input Contacts = 14 Aux = 125VDC But it is depend on operation and functional of motor.For more detail setting,please refer manual guide of motor from manufacture. 2Min brake current I res.0 Suggest to select I res .0 = I b 3Ratio brake coefficient S The calculation of three-phase main transformer high-voltage busbar metallic short-circuit occurs current when generator is parallel off: ) I k( 3. max = Sb 1 1 100000 = = 1.674 A X + XT 3 230 nTA 0.08 + 0.07 3 230 1000 ,, d External three-phase short-circuit the maximum short-circuit current: I unb . max should be set by the condition of main transformer HV side two phase metal short circuit I op. Motor Protection Relay Setting Calculation Guide Full PDF Generator Under & Over Frequency81G 11.1 Basic parameter Generator under & over frequency capability tables provided by the equipment manufacturing factor: Allow run-time FrequencyHz accumulated Each time (min) time(s) 51.0 < F 51.5 30 30 50.5 < F 51 180 180 48.5 < F 50.5 48 < F 48.5 Run Continuously 300 Allow run-time FrequencyHz accumulated 47.5 < F 48 47 < F 47.5 46.5 < F 47 300 11.2 Setting calculation 1Under frequency zone I under-frequency zone I frequency setting f1.set = 48.5 Hz under-frequency zone I accumulated time t1.set = 18000s under-frequency zone I time delay t1.set = 300 s 2Under frequency zone II under-frequency zone II frequency setting f 2.set = 48 Hz under-frequency zone II accumulated time t 2.set = 3600s Each time (min) time(s) 60 60 10 20 2 5 under-frequency zone II time delay t 2.set = 60 s 3Under frequency zone III under-frequency zone III frequency setting f 3.set = 47.5 Hz under-frequency zone III accumulated time t 3.set = 600 s under-frequency zone III time delay t 3.set = 20 s 4Under frequency zone IV under-frequency zone IV frequency setting f 4.set = 47 Hz under-frequency zone IV time delay t 4.set = 20 s 5Over-frequency over-frequency setting f set = 51Hz over-frequency time delay t set = 30 s 6Generator terminal low voltage setting U set = 0.8U n = 88V 7Output model: Programming Trip 12. Generator Relay Protection Setting Calculation - DocShare.tips The relation mode between the generator short time withstanding negative-sequence over-current multiple and allowed duration time is t= I 22* A I 22 Thereinis the per-unit I 2 value of generator negative-sequence current is the per-unit value of generator long term allowed negative-sequence current A is the time constant of withstanding negative-sequence current ability of rotor surface Reverse time specified startup current The reverse time specified startup current I op . Generator Negative-Sequence Over-current46G 8.1 Basic parameter Rated secondary current I gn 2 4.41A The per-unit value of generator long term allowed negative-sequence current I 2 time constant of withstanding negative-sequence current ability of rotor surfaceA 0.08 P.U . Comprehensive Generator Protection Connect the SEL-700G across small, medium, or large generators for complete primary and backup protection. XJ Electricity Co., Ltd 2010.11 Catalog 1. 4185 A K st is the same type coefficient of TA K st = 1.0 K aper or is non-periodic coefficient of TA K aper = 1.0 K aper = 1.5 ~ 2.0 5P or 10P type TA TP type TA Setting of ratio braking coefficient S S= K rel I unb.max - I op.0 I res.max - I res.0 = 1.5 0.4185 0.225 = 0.31 1.674 0.36 Suggest to select: S = 0.4 4Sensitivity check Sensitivity check principle : Main transformer high-voltage side of two-phase metallic short-circuit occurs when generator is parallel off: I k . Stator Earth Fault 100%64G1 14.1 Basic parameter 13.8 / 0.3kV Neutral earthing transformer ratio Neutral earthing transformer secondary resistance ( Rn ) 1.3 Neutral earthing transformer primary resistance ( RN ) 2750.8 Neutral earthing transformer secondary CT ratio( nTA 0 ) 100 / 1 Generator 3 relative capacitance ( 3C0 ) 1.392F Generator capacitive reactance ( X C 0 ) 6860 14.2 Setting calculation 1) earthing resistance The setting of earthing resistance low set value should be set by the principle of one point earthing in the distance within 20% of generator neutral, the earthing fault point current 3I0 safe earthing current Is(1A). max = K ap K er K cc I k( 3. max = 2 0.1 0.5 32.69 = 3.27 A ThereinK ap is the non-periodic branch coefficient select 1.52.0K cc is the same type coefficient of transformer select 0.5 K er is the error coefficient of transformer ratio select 0.1 Put the condition of the differential protection wont error operate under the max outer short circuit currentthe secondary current value I op .max of correspondent max operation current I op.max = K rel I unb.max = 1.5 3.27 = 4.9 A Therein K rel is the reliable coefficient, select 1.31.5.
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