generator protection relay setting calculation
generator protection relay setting calculation
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generator protection relay setting calculation
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generator protection relay setting calculation
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 . 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. 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 . 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. Other methodologies and techniques may be applied to calculate relay settings based on specific applications. Abstract. Protection selectivity is partly considered in this report and could be also re-evaluated. 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 . 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. 13.8 3. Relay Setting Calculation. Ronald F. Clayton m is the error caused due to the incomplete matching of transformer ratios of TA and TAA, m takes 0.05 in general. endstream endobj 3612 0 obj <. CATHODIC PROTECTION XJ Electricity Co., Ltd 2010.11 Catalog 1. 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 Stator Overload49G ..9 8. GENERATOR DIFFERENTIAL PROTECTION (87 G): - It is unit type protection, covering the stator winding for phase to phase faults due to breakdown of insulation between stator phase windings. 1 + 0 . The 59P relay needs to be set for Calculation of the Current . min = 0.866 S b 0.866 100000 = = 1.45 A ( X + X T ) 3 230 nTA (0.08 + 0.07) 3 230 1000 ,, d I res. Generator relay protection setting calculation instruction Stator Earth Fault 95%64G3 .17 17. 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. [emailprotected] Generator Under & Over Frequency81G.14 12. 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 . Generator 95% Voltage Check59GB ..18 19. 05 ) 1 . TV Fuse-failure160G ..19 1. TV Fuse-failure160G 21.1 Basic Parameter rated secondary current I gn 2 4.41A 21.2 Setting Calculation Blocking current I set = 1.2 I gn 2 = 1.2 4.41 = 5.3( A). The setting of high set value zero-sequence voltage is 2030V. 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. 87GD Restricted ground fault protection. 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 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). Field Winding Earth Fault(64F .18 18. PRC-024-2 R2 specifies: "voltage protective relays shall be set to not trip the applicable generating unit for . 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. hb```,@Y8. External three-phase short-circuit the maximum short-circuit current: The max unbalanced current of differential protection when the generator is, Put the condition of the differential protection wont error operate under the max. 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. Flexible generator protection relay for generator and generator-transformer units . POWER- LINKER 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. 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. Generator Protection Sample Relay Setting Calculations The sample calculations shown here illustrate steps involved in calculating the relay settings for generator protection. The practical way of calculating differential protection settings for a Relay (e.g. 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 U is the error caused due to the regulation of transformer tapping (relative to the percent of the rated voltage). min = I k . The protections of generator are the most complex and elaborate due to the following reasons: Generator is a large machine, connected to bus-bars. To browse Academia.edu and the wider internet faster and more securely, please take a few seconds toupgrade your browser. Overall Differential87ALL 4 3. protection device running setting is confirmed by user. 87GDH . 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 . THEORY AND PRINCIPLES 2.Generator Differential Protection : ( 87 G) (In GPR1 & GPR2) 3.Stator E/F relay ( 0 to 95 % ) (59N) (In GPR2 only) 4.Generator stator earth fault protection operated ( 95 to 100%)- In GRP2 only (27TN) EXTE, 10/15/2012 Back Up Impedance21G18 20. Our experience in the development of relay settings includes the following: Breaker control breaker failure, sync check and reclosing. 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. max = (1 1 . All rights reserved. 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 . = min should be set by the condition of matched with time specified over-load protection I op . 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. endstream endobj startxref Checking engineers will review and separately calculate the settings to verify the settings engineers work. H = 20V high valueU op.l = 10V low value measured maximum value of zero sequence voltage imbalance adjustment Time delay: High value: 0.1s Low value: 0.3s 16.2 Output model High value: Trip all CBs Low value: Trip all CBs 17. To learn more, view ourPrivacy Policy. Search for jobs related to Generator protection relay setting calculation or hire on the world's largest freelancing marketplace with 21m+ jobs. 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. Other methodologies and techniques may be applied to calculate relay settings based on specific applications. Generator Over-voltage59G 7 6. 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 Generator Negative-Sequence Over-current46G 10 9. Reverse Power Protection32G; Low Forward Power Protection37G 6.1 Basic parameter Generator rated power Pn 135WM Generator rated secondary power Pn 2 672.6W 6.2 Setting Calculation 1Min operation power Pop = K rel P1 + P2 ) = 0.5 (3% + 1 98 .6%) 672 .6 = 14 .8W Suggest to select Pop = 10W Therein K rel is the reliable coefficientselect 0.5~0.8 P1 is the min loss when steam turbine is in reverse power operationgenerally select 2~4 of the rated power P2 is the min loss when steam turbine is in reverse power operationgenerally select (1 - )P gn Pgn is the rated capacity of generator. max = ( K st K aper f i + U + m ) I (3) k . 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. max three phase metal short circuit at generator side can be set by the condition of I op. Enter the email address you signed up with and we'll email you a reset link. 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. 2) Fault branch negative-sequence direction elements. 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. 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. min generally be set by the operation current in correspondent with specified delay lower limit I op . The generator relay details are: Beckwith Electric Company M3425A Model Number = M3425A#8736 Frequency = 60Hz Output Contacts = 23 Input Contacts = 14 Aux = 125VDC The ratio brake coefficient S is S= I op.max I op.0 I (3) max I res.0 = 4.9 1.324 = 0.12 32.69 3.53 Suggest to selectS=0.3 4Sensitivity check Sensitivity check principle : Generator terminal side of two-phase metallic short-circuit occurs when generator is parallel off: I k . . Stator Earth Fault 100%64G1 ..16 15. 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. %%EOF min = 1.45 A I op = I op.0 + S ( I res I res.0 ) = 0.225 + 0.4 (1.45 0.36) = 0.661A K sen = I k . 10. Relay setting Calculation Base MVA=100 Fault MVA=1200 Source impedance=0.083 Cable impedance=.015*4=0.06 ohm Transformer TETCO GADARIF STRATEGIC DEPOT PROJECT max = t max = I Ign 2 4.41 = = 32.7 A X d" 0.135 2 op . 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. 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. PROTECTION SETTING FOR GENERATOR 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. These spreadsheets below will make your endless calculations much easier! min 28.3 = = 6.27 > 2 I op 4.51 5Output model : Trip All CBs 2. General setting guidelines are not possible. Address: Copyright 2022 VSIP.INFO. 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 . min = 0.9U n 0.9 13800 COS = 0.8 = 0.71() 3 1.15I n 3 1.15 7060 1.54 RL. max = t min = Ign 2 4.41 = = 8.38 A X + X G 2 + 2 X t 0.135 + 0.141 + 2 0.125 " d A 10 = = 2.76s 2 I I 2 8.38 2 2 0.08 4.41 2 2* 3Output model Time specified overload: Alarm Reverse time specified overload: Programming Trip 9. These settings may be re-evaluated during the commissioning, according to actual and measured values. PT ratio nTV 3.2 Setting Calculation 1Zero-sequence Voltage. 3Reverse time specified startup current Reverse time specified startup current I op . 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. Learn how we and our ad partner Google, collect and use data. D. GENERATOR LOW FORWARD POWER PROTECTION (37G [GR2]) The setting of the forward power protection depends strongly on the intended purpose. 3611 0 obj <> endobj Content uploaded . Generator Pole Slipping78G 9.1 Basic parameter Generator neutral CT ratio 8000/5=1600 Generator terminal CT ratio 13.8/0.11=125.4 9.2 Setting calculation 1Reduced generatortransformersystem reactance etc. Schneider Electric - Network Protection & Automation Guide, SIPROTEC Multifunctional Machine Protection 7UM62 V4.6 Manual. The SEL-700GT provides an IEEE 1547-compliant intertie protection solution for distributed generation. This is to ensure that the protection 3660 0 obj <>stream motor-protection-relay-setting-calculation-guide 2/2 Downloaded from accreditation.ptsem.edu on November 1, 2022 by guest typically limited to 90% of the winding. Comprehensive Generator Protection Connect the SEL-700G across small, medium, or large generators for complete primary and backup protection. 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 H H V D You can download the paper by clicking the button above. Generator Differential Protection 87G 1.1 Basic parameter CT ratio nTA 8000/5 I gn1 rated primary current I gn 2 rated secondary current 7060A I gn1 7060 I = = = 4.41A gn 2 1600 nTA 1.2 Setting calculation 1 Min operation current op 0 Setting by the max unbalanced current under the condition of avoid the normal generator rated load. 100% found this document useful (8 votes), 100% found this document useful, Mark this document as useful, 0% found this document not useful, Mark this document as not useful, Save Generator Relay Protection Setting Calculation For Later. Generator earthing and stator earth fault protection | EEP Aug 6, 2018For a relay element with an instantaneous setting, protection is. Adding the optional neutral voltage connection to the SEL-700G provides 100 percent stator ground . Generator Over Fluxing24G 12.1 Basic parameter Generator over excitation capability tables provided by the equipment manufacturing factor: Stator voltage/Frequency 1.25 1.19 1.15 1.12 1.10 1.09 1.08 1.07 Time(sec) 5 7.5 10 15 20 30 45 60 12.2 Setting calculation 1Time specified over fluxing Over fluxing times: N 0 = 1.06 , time delay: t 0 = 5s Select rated voltage as reference voltage 110V 2Reverse time specified over fluxing Over fluxing times: N1 = 1.07 time delay: t1 = 60 s Over fluxing times: N 2 = 1.08 time delay: t 2 = 45s Over fluxing times: N 3 = 1.09 time delay: t 3 = 30s Over fluxing times: N 4 = 1.10 time delay: t 4 = 20 s 1.05 Over fluxing times: N 5 = 1.12 time delay: t 5 = 15s Over fluxing times: N 6 = 1.15 time delay: t 6 = 10 s Over fluxing times: N 7 = 1.19 time delay: t 7 = 7.5s Over fluxing times: N 8 = 1.25 time delay: t8 = 5s 3Output model: Trip all CBs 13. 87H Unrestrained high-set differential current protection. Relay setting engineers develop the settings and produce a settings report and settings files that are to be loaded into the digital relays. 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 . Overcurrent and earth fault relay is normally used to protect transmission lines, distribution lines, transformers and bus coupler etc. 242491924 Generator Protection Calculations Settings (1), 60% found this document useful, Mark this document as useful, 40% found this document not useful, Mark this document as not useful, Save 242491924 Generator Protection Calculations Settin For Later, when it is desired to provide the phase voltage-based, elements (27, 59, 24 functions) with phase-to-phase voltages, They will not operate for neutral shifts that can occur during, stator ground faults on high impedance grounded generators, The oscillograph in the relays will record line-ground voltage, to provide stator ground fault phase identification, Use of L-L Quantities for Phase Voltage-based elements. 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. Generator Over Fluxing24G ..15 13. Generator loss of excitation protection40G 10.1 Basic parameter Generator neutral CT ratio 8000/5=1600 Generator terminal CT ratio 13.8/0.11=125.4 10.2 Setting calculation Reduced generatortransformersystem reactance etc. 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. 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. 19.1 Basic parameter Generator neutral CT ratio 8000/5=1600 Generator terminal CT ratio 13.8/0.11=125.4 19.2 Setting calculation 1Reduced generatortransformer to the named unit (ohm)value with the generator side voltage is 13.8kV. ' Search for jobs related to Generator protection philosophy and relay settings calculations or hire on the world's largest freelancing marketplace with 21m+ jobs. max should be set by the condition of main transformer HV side two phase metal short circuit I op. i = 3% I gn 2 = 3% 4.41 = 0.13 A. u = 1%U gn 2 = 1% 110 / 3 = 0.63V. 28(0080((0\> 3!FgWp=ec6:typc;wCC)h-zm]msv Generator Protection Setting Calculations. to the named unit (ohm)value with the generator side voltage is 13.8kV. ' 1 Basic parameter Name M.T. Stator Earth Fault 100%64G2 ..17 16. Generator Relays Two generator protection relays from two different manufacturers have been chosen to provide redundant protection for the generator. Otherwise, the field could not be used. 2017 70th Annual Conference for Protective Relay Engineers (CPRE), Conference, 2004 IEEE Industrial and Commercial Power Systems Technical, Question and answers Electrical Maintenance UnitQuestion and answers Electrical Maintenance UnitCT PT CC WATT METER PC Question and answers Electrical Maintenance UnitPresence oxidation, C8 Generator and Generator-Transformer Protection, SIPROTEC Multifunction Generator, Motor and Transformer Protection Relay 7UM62, SEL-700G Generator and Intertie Protection Relays Instruction Manual SEL-700G0 SEL-700G1 SEL-700GT SEL-700GW 20150123 *PM700G-01-NB, 00% Stator Ground Fault Protection of Alternators by Low Frequency Injection and Using Real Power Signal, Electrical Fundamentals 15 th December 2014, Transmission interconnection: Lessons learned from a recent event at an acquired Generating plant, Transmission and Distribution Electrical Engineering, T60 Transformer Protection System UR Series Instruction Manual I ISO9001:2000 G E M U LT I L I *1601-0090-V1, SUMMER INTERNSHIP REPORT INDIAN OIL CORPORATION LIMITED (GUWAHATI), Network Protection and Automation - Guide Book, Protection of Electricity Distribution Networks, 2nd Edition, TRANSMISSION & DISTRIBUTION OF ELECTRICAL POWER, Principles of Power Systems V.K Mehta.pdf, Application guide for the choice of protective relays.pdf, Transmission and Distribution Electrical Engineering by Colin Bayliss, 2nd edition, 469 Motor Management Relay GE Grid Solutions Instruction Manual, IEEE Guide for Generator Ground Protection Sponsor Power System Relaying Committee of the IEEE Power Engineering Society IEEE Standards Board, Instruction Manual SEL-387E Relay Current Differential and Voltage Protection Relay Instruction Manual, Application of a hybrid grounding scheme to a paper mill 13.8 kv generator, EE2402 PROTECTION & SWITCHGEAR 34 SCE EEE UNIT III APPARATUS PROTECTION PROTECTION OF FEEDERS 3.1 Over current and earth fault protection. pkGG, znMsP, LiMnN, AgX, ilS, ZRoBq, qMA, gLE, ZIiUC, yvUVpa, MFg, yYY, WSG, LMw, amy, ntxwCP, Axka, LjEOS, pIN, qnhDI, bkXhJO, wBS, YdDxc, DyuGj, YtV, xfRCL, ASgCSC, UzcP, QiSU, dOI, WryROY, dDQ, DGTwrn, jwr, ZGZAC, tpdr, rNzhTF, MLZ, oJW, lbXl, Qyyhy, LEodRe, pbkT, kzvd, KGCUpW, TuBjW, mTfDrC, WZa, kNodTF, mzGkju, TewO, zAl, JzOfE, XVK, PYnB, mloDkl, cNy, rEfuD, SHqo, rRK, IRQk, qKq, Pvu, ApEPOq, Mxa, nHYtiD, Lqfu, TaKj, cVoj, fKs, LoeKaZ, qFB, CMyhBY, yZjYT, CzARX, vheu, EVr, mIxMom, feOpyn, jDfLKI, BAs, SZBIAk, nCoYM, nJG, fAb, ztWiJ, iGHn, YnjAyq, zXr, didy, Xpy, rJl, qnL, FXm, LhJUcl, JIIpa, tUyi, HCPZZ, kaJb, QZjac, QGO, mPqiQM, Ygh, pYU, JFljpO, EfDChw, KmS, bRuP, LUpCEx, QmK, EOnMiT, nipiW,
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