Power Electronics Lab Manual ME PED

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The manual is useful for PG students belongs to ME power Electronics and Drives
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M.MURUGANANDAM. M.E.,(Ph.D).,MIEEE.,MISTE,
Assistant Professor & Head / EIE,
Muthayammal Engineering College,
Rasipuram,
Namakkal-637 408.
Cell No: 9965768327

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Power Electronics Lab Manual ME PED

  1. 1. Power Electronics and Drives Lab ManualMUTHAYAMMAL ENGINEERING COLLEGE, RASIPURAM Department of Electrical and Electronics Engineering D E S I G N I N G YOUR F U T U R E MUTHAYAMMAL EDUCATIONAL INSTITUTIONS II Semester – ME (PED) PE 1655 - Power Electronics and Drives Laboratory ManualPrepared by Approved byProf.M.Muruganandam, M.E., Dr P.Murugesan,B.E.,Ph.D.,AP/ EEE MISTE, MIIPE, MIETE, FUWAI Proff. & HOD/EEERevision No.:0 Date:01.01.2007 Muthayammal Engineering college, Rasipuram. 1
  2. 2. Power Electronics and Drives Lab ManualMuthayammal Engineering college, Rasipuram. 2
  3. 3. Power Electronics and Drives Lab Manual INSTRUCTIONS TO THE CANDIDATESAFETY: You are doing experiments in Power Electronics lab with high voltage andhigh current electric power. It may cause even a fatal or loss of energy of yourbody system. To avoid this please keep in mind the followings In case of any wrong observations, you have to SWITCH OFF the power supply related with it. You have to tuck in your shirts or wear an overcoat. You have to wear shoes compulsorily and stand on mats made by insulating materials to electrically isolate your body from the earth.ATTENDANCE: If you absent for a lab class then you have lost several things to learn.Laboratory should be treated as temple, which will decide your life. So don’t failto make your presence with your record notebook having completedexperiments, observation with completed experiments, day’s experimentparticulars with required knowledge about it and stationeries.MAKING CONNECTIONS: Get circuit diagram approval from your staff in charge. Go to the respective worktable and start to give connection as per the circuit diagram from source side. Make series circuit connections before the parallel circuits like voltmeter connections. Before switch on the power, get circuit connection approval from the staff in charge.DOING EXPERIMENT: Start the experiment in the presence of an instructor / staff in-charge and do the same by proper procedure. If staff permits you then precede your experiment.OBSERVATION: Before take the wave forms calibrate the CRO. Note all the required readings in their respective tables. Note all the wave forms from the CRO.CALCULATION: Calculate the required quantities by suitable formulae and tabulate them with units. Draw the necessary graphs and write the result with reference. Get verification of observation and calculation from your staff in charge. Muthayammal Engineering college, Rasipuram. 3
  4. 4. Power Electronics and Drives Lab ManualRECORD: Record is show the equipment’s and your performance. It will be veryuseful for future reference. So keep it as follows. Enter the things in the record notebook those have been written in your observation. Units should be written for all quantities. Draw necessary graphs and complete the record before coming to the next lab class. Don’t forget to write the theory with precaution and inference of each experiment. MAY I HELP YOU 1. Device ratings should be noted. 2. Moving coil meters should be used for DC measurements. 3. Moving iron meters should be used for AC measurements. 4. Use isolated supply for the CRO. 5. Use attenuation probe for high voltage measurements in CRO. Muthayammal Engineering college, Rasipuram. 4
  5. 5. Power Electronics and Drives Lab Manual CONTENTSSl.No. Name of the experiment Page No. 1. Single Phase Semi-converter with R-L and R-L-E loads for 02 continuous and discontinuous conduction modes. 2. Single phase full- converter with R-L and R-L-E loads for continuous 08 and discontinuous conduction modes. 3. Three phase full-converter with R-L-E load. 14 4. MOSFET based step up and step down chopper. 20 5. IGBT based Single phase PWM inverter. 28 6. Single phase AC voltage controller using SCR and using TRIAC. 34 7. IGBT based four quadrant choppers. 8. IGBT based Three phase inverters. 9. Simulation of closed loop control of converter fed DC motor drive. 10. Simulation of closed loop control of chopper fed DC motor drive. 11. Simulation of VSI fed three phase induction motor drive. 12. Simulation of three phase synchronous motor and drive. Muthayammal Engineering college, Rasipuram. 5
  6. 6. Power Electronics and Drives Lab ManualSINGLE PHASE SEMI-CONVERTER WITH R-L AND R-L-E LOADS FOR CONTINUOUS AND DISCONTINUOUS CONDUCTION MODES CIRCUIT DIAGRAM FOR R-L LOAD Model graph for R-L Load with continuous conduction ° ( = 30°, R=100 , L=100mH) Model graph for R-L Load with discontinuous conduction ° ( = 90°, R=100 , L=100mH) Muthayammal Engineering college, Rasipuram. 6
  7. 7. Power Electronics and Drives Lab Manual SINGLE PHASE SEMI-CONVERTER WITH R-L AND R-L-E LOADS FOR CONTINUOUS AND DISCONTINUOUS CONDUCTION MODESAIM: To study the wave form for single phase full wave half controlled bridge rectifierwith R-L and R-L-E loads for continuous and discontinuous conduction modes.APPARATUS REQUIRED:S.No. Name of the item Type Range Quantity 1 SCR module with protection TYN612 600V,12A 2 2 Diode module with protection BY126 - 3 3 SCR Triggering Kit - - 1 4 Battery - 12V 1 5 Ammeter MC (0-500) mA 1 6 Voltmeter MC (0-30) V 1 7 CRO - - 1 8 CRO Brobe - - 1 9 Patch Cards - - 10FORMULA USED: For RL load continuous & discontinuous conduction and for RLE load continuous conduction: V 1. Average dc output voltage Vdc is Vdc = m (1 + cos ) 1 1 sin 2 2 2. RMS output voltage is Vrms Vrms = Vm + 2 2 For RLE load discontinuous conduction: Vm 3. Average dc output voltage Vdc is Vdc = (1 + cos ) + E 1 1 2 2 1 V sin 2 4. RMS output voltage Vrms = m + + E2( + ) 2 2 Muthayammal Engineering college, Rasipuram. 7
  8. 8. Power Electronics and Drives Lab Manual CIRCUIT DIAGRAM FOR R-L-E LOAD Model graph for R-L-E Load with continuous conduction ° ( = 30°, R=100 , L=200mH, E=30V)Model graph for R-L-E Load with discontinuous conduction ° ( = 90°, R=100 , L=200mH, E=30V) Muthayammal Engineering college, Rasipuram. 8
  9. 9. Power Electronics and Drives Lab Manual General Formula: 2 Vdc 5. Rectification efficiency % = 2 Vrms V 6. Form factor FF = rms Vdc 7. Peak inverse voltage PIV = Vm 8. Ripple factor RF = FF 2 1Where Vm = maximum or peak voltage in volts = 2Vs Vs = Supply voltage in volts = Firing angle = Extinction angle = Conduction angle = -Procedure: 1. Connections are made as per the circuit diagram for RL load 2. Switch on the triggering kit 3. Switch on the 24V AC supply 4. Switch on the debounce logic 5. By varying potentiometer vary the firing angle of the converter in order to vary the output voltage step by step. 6. For each step note down the firing angle, output voltage and load current. 7. The output voltage is theoretically calculated for each step and the readings are tabulated. 8. Repeat the same procedure for RLE load. Muthayammal Engineering college, Rasipuram. 9
  10. 10. Power Electronics and Drives Lab ManualTabulation for RL load: Vs= R= L=S.No. Firing Angle Idc Measured Vdc Measured Vdc Calculated Vrms Calculated in degree in milliamps in volts in volts in volts Continuous conduction Discontinuous conductionTabulation for RLE load: Vs= R= L= E= =S.No. Firing Angle Idc Measured Vdc Measured Vdc Calculated Vrms Calculated in degree in milliamps in volts in volts in volts Continuous conduction Discontinuous conduction Muthayammal Engineering college, Rasipuram. 10
  11. 11. Power Electronics and Drives Lab ManualINFERENCE:DISCUSSION QUESTIONS:1. What is power electronics?2. What are the types of converter in power electronics?3. What is firing angle?4. What is active load?5. Why the negative voltage is not possible in semi converter?6. What is freewheeling diode?7. Is a separate freewheeling diode necessary for semi converter? Justify your answer.RESULT: Muthayammal Engineering college, Rasipuram. 11
  12. 12. Power Electronics and Drives Lab ManualSINGLE PHASE FULL-CONVERTER WITH R-L AND R-L-E LOADS FOR CONTINUOUS AND DISCONTINUOUS CONDUCTION MODES CIRCUIT DIAGRAM FOR R-L LOAD Model graph for R-L Load with continuous conduction ° ( = 30°, R=100 , L=200mH) Model graph for R-L Load with discontinuous conduction ° ( = 90°, R=100 , L=200mH) Muthayammal Engineering college, Rasipuram. 12
  13. 13. Power Electronics and Drives Lab Manual SINGLE PHASE FULL-CONVERTER WITH R-L AND R-L-E LOADS FOR CONTINUOUS AND DISCONTINUOUS CONDUCTION MODESAIM: To study the wave form for single phase fully controlled bridge rectifier with R-Land R-L-E loads for continuous and discontinuous conduction modes.APPARATUS REQUIRED:S.No. Name of the item Type Range Quantity 1 SCR module with protection TYN612 600V,12A 4 2 SCR Triggering Kit - - 1 3 Battery - 12V 1 4 Ammeter MC (0-500) mA 1 5 Voltmeter MC (0-30) V 1 6 CRO - - 1 7 CRO Brobe - - 1 8 Patch Cards - - 10FORMULA USED: For RL load continuous and for RLE load continuous conduction: 2V 1. Average dc output voltage Vdc is Vdc = m cos Vm 2. RMS output voltage Vrms is Vrms = = Vs 2 For RL load discontinuous conduction: Vm 3. Average dc output voltage Vdc is Vdc = (cos cos ) 1 V2 sin 2 sin 2 2 4. RMS output voltage Vrms is Vrms = m + 2 2 2 For RLE load discontinuous conduction: 1 5. Average dc output voltage Vdc is Vdc = (Vm (cos cos ) + E ( + )) 1 2 2 1 V sin 2 sin 2 6. RMS output voltage Vrms = m + + E2( + ) 2 2 2 Muthayammal Engineering college, Rasipuram. 13
  14. 14. Power Electronics and Drives Lab Manual CIRCUIT DIAGRAM FOR R-L-E LOAD Model graph for R-L-E Load with continuous conduction ° ( = 30°, R=100 , L=300mH, E=30V)Model graph for R-L-E Load with discontinuous conduction ° ( = 90°, R=100 , L=300mH, E=30V) Muthayammal Engineering college, Rasipuram. 14
  15. 15. Power Electronics and Drives Lab Manual General Formula: 2 Vdc 7. Rectification efficiency % = 2 Vrms V 8. Form factor FF = rms Vdc 9. Peak inverse voltage PIV = Vm 10. Ripple factor RF = FF 2 1Where Vm = maximum or peak voltage in volts = 2Vs Vs = Supply voltage in volts = Firing angle = Extinction angle = Conduction angle = -Procedure: 1. Connections are made as per the circuit diagram for RL load 2. Switch on the triggering kit 3. Switch on the 24V AC supply 4. Switch on the debounce logic 5. By varying potentiometer vary the firing angle of the converter in order to vary the output voltage step by step. 6. For each step note down the firing angle, output voltage and load current. 7. The output voltage is theoretically calculated for each steps and the readings are tabulated. 8. Repeat the same procedure for RLE load. Muthayammal Engineering college, Rasipuram. 15
  16. 16. Power Electronics and Drives Lab ManualTabulation for RL load: Vs= R= L= =S.No. Firing Angle Idc Measured Vdc Measured Vdc Calculated Vrms Calculated in degree in milliamps in volts in volts in volts Continuous conduction Discontinuous conductionTabulation for RLE load: Vs= R= L= E= =S.No. Firing Angle Idc Measured Vdc Measured Vdc Calculated Vrms Calculated in degree in milliamps in volts in volts in volts Continuous conduction Discontinuous conduction Muthayammal Engineering college, Rasipuram. 16
  17. 17. Power Electronics and Drives Lab ManualINFERENCE:DISCUSSION QUESTIONS: 1. What is inversion mode of operation? 2. When we connect a freewheeling diode in full converter what will be the output? 3. Why the inversion mode is not possible in semi converter? 4. Why the power factor of full converter is lower than semi converter? 5. What is , , and µ?RESULT: Muthayammal Engineering college, Rasipuram. 17
  18. 18. Power Electronics and Drives Lab ManualTHREE PHASE FULL-CONVERTER WITH R-L-E LOAD FOR CONTINUOUS AND DISCONTINUOUS CONDUCTION MODES CIRCUIT DIAGRAM FOR R-L-E LOAD Model graph for R-L-E Load with continuous conduction ° ( = 30°, R=100 , L=1000mH, E=50V) Muthayammal Engineering college, Rasipuram. 18
  19. 19. Power Electronics and Drives Lab Manual THREE PHASE FULL-CONVERTER WITH R-L-E LOAD FOR CONTINUOUS AND DISCONTINUOUS CONDUCTION MODESAIM: To study the wave form for three phase full-converter with r-l-e load forcontinuous and discontinuous conduction modesAPPARATUS REQUIRED:S.No. Name of the item Type Range Quantity 1 3! SCR module with protection TYN612 600V,12A 4 2 3! Triggering Kit - - 1 3 DC motor Sep. Excited 1 KW 1 4 Ammeter MC (0-5) A 1 5 Voltmeter MC (0-600) V 1 6 CRO - - 1 7 CRO Brobe - - 1 8 Patch Cards - - 10FORMULA USED: For RLE load continuous conduction: 3 3Vm 1. Average dc output voltage Vdc is Vdc = cos 1 1 3 3 2 2. RMS output voltage Vrms is Vrms = 3Vm + cos 2 2 4 For RLE load discontinuous conduction: 3. Average dc output voltage Vdc is 4. RMS output voltage Muthayammal Engineering college, Rasipuram. 19
  20. 20. Power Electronics and Drives Lab ManualModel graph for R-L-E Load with discontinuous conduction ° ( = 80°, R=100 , L=100mH, E=50V) Muthayammal Engineering college, Rasipuram. 20
  21. 21. Power Electronics and Drives Lab Manual General Formula: 2 Vdc 5. Rectification efficiency % = 2 Vrms V 6. Form factor FF = rms Vdc 7. Peak inverse voltage PIV = 3Vm 8. Ripple factor RF = FF 2 1Where Vm = maximum or peak phase voltage in volts = 2Vs Vs = Supply phase voltage in volts = Firing angle = Extinction angle = Conduction angle = -Procedure: 1. Connections are made as per the circuit diagram for RL load 2. Switch on the triggering kit 3. Switch on the 24V AC supply 4. Switch on the debounce logic 5. By varying potentiometer vary the firing angle of the converter in order to vary the output voltage step by step. 6. For each step note down the firing angle, output voltage and load current. 7. The output voltage is theoretically calculated for each steps and the readings are tabulated. 8. Repeat the same procedure for RLE load. Muthayammal Engineering college, Rasipuram. 21
  22. 22. Power Electronics and Drives Lab ManualTabulation for RLE load: Vs= R= L= E= =S.No. Firing Angle Idc Measured Vdc Measured Vdc Calculated Vrms Calculated in degree in milliamps in volts in volts in volts Continuous conduction Discontinuous conduction Muthayammal Engineering college, Rasipuram. 22
  23. 23. Power Electronics and Drives Lab ManualINFERENCE:DISCUSSION QUESTIONS: 1. Why we go for three phase converter? 2. What are the applications of three phase full converter? 3. What are the methods to reduce the ripple content? 4. Explain about the commutation? 5. What are the differences between converter grade SCR and inverter grade SCR?RESULT: Muthayammal Engineering college, Rasipuram. 23
  24. 24. Power Electronics and Drives Lab ManualMOSFET BASED STEP UP AND STEP DOWN CHOPPER CIRCUIT DIAGRAM FOR STEP DOWN OPERATION Model graph for step down operation Muthayammal Engineering college, Rasipuram. 24
  25. 25. Power Electronics and Drives Lab Manual MOSFET BASED STEP UP AND STEP DOWN CHOPPERAIM: To study the wave form for MOSFET based step down chopper, step up chopperand step up & step down chopper for different load for continuous and discontinuousconduction modes.APPARATUS REQUIRED:S.No. Name of the item Type Range Quantity 1 MOSFET Module IRF 840 - 1 2 Ammeter MC (0-500mA) 1 3 Voltmeter MC (0-30V) 1 4 Rheostat - - 1 5 RPS - (0-30V) 1 6 Diode Py 127 - 1 7 Inductor Ferrite core 100mH 1 8 CRO - - 1 9 CRO Probe - - 1 10 Patch cards - - -FORMULA USED: For step down chopper 1. Average dc output voltage Vdc is Vdc = "Vs 2. RMS output voltage Vrms is Vrms = " Vs For step up chopper Vs 3. Average dc output voltage Vdc is Vdc = (1 " ) For step up and step down chopper "Vs 4. Average dc output voltage Vdc is Vdc = (1 " ) Where TON " = Duty cycle of the chopper "= T TON = on time T = Total time Muthayammal Engineering college, Rasipuram. 25
  26. 26. Power Electronics and Drives Lab Manual CIRCUIT DIAGRAM FOR STEP UP OPERATION Model graph for step up operationMuthayammal Engineering college, Rasipuram. 26
  27. 27. Power Electronics and Drives Lab ManualProcedure: 1. Connections are made as per the circuit diagram for step down chopper 2. Switch on the RPS first and turn on triggering kit 3. Switch on the debounce logic 4. By changing the width of the pulse, obtain the different set of reading. 5. For each step note down the duty cycle, output voltage and load current. 6. The output voltage is theoretically calculated for each step and the readings are tabulated. 7. Repeat the same procedure for step up chopper and step up& step down chopper. 8. Draw the graph as per the reading in the table. Muthayammal Engineering college, Rasipuram. 27
  28. 28. Power Electronics and Drives Lab ManualCIRCUIT DIAGRAM FOR STEP UP AND STEPDOWN OPERATION Model graph for step down operation Muthayammal Engineering college, Rasipuram. 28
  29. 29. Power Electronics and Drives Lab ManualINFERENCE:DISCUSSION QUESTIONS: 1. What is chopper and what are the devices generally used for chopper? 2. What are the types of chopper? 3. What are the control strategies used for choppers? 4. Why frequency modulation is not preferred mostly? 5. Why thyristor is not preferred in chopper circuit mostly? Muthayammal Engineering college, Rasipuram. 29
  30. 30. Power Electronics and Drives Lab ManualTabulation for step down chopper: Vs= T=S.No. TON TON Idc (Avg) Vdc (Avg) Vdc (Avg) in ms " = Measured Measured Calculated T in mA in volts in volts Vdc = "Vs 1 2 3 4 5Tabulation for step up chopper: Vs= T=S.No. TON TON Idc (Avg) Vdc (Avg) Vdc (Avg) in ms " = Measured Measured Calculated T in mA in volts in volts Vs Vdc = (1 " ) 1 2 3 4 5Tabulation for step down & step up chopper: Vs= T=S.No. TON TON Idc (Avg) Vdc (Avg) Vdc (Avg) in ms " = Measured Measured Calculated T in mA in volts in volts "Vs Vdc = (1 " ) 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 30
  31. 31. Power Electronics and Drives Lab ManualRESULT: Muthayammal Engineering college, Rasipuram. 31
  32. 32. Power Electronics and Drives Lab Manual IGBT BASED SINGLE PHASE PWM INVERTER CIRCUIT DIAGRAMMuthayammal Engineering college, Rasipuram. 32
  33. 33. Power Electronics and Drives Lab Manual IGBT BASED SINGLE PHASE PWM INVERTERAIM: To study the wave form for single phase bridge inverter with R loadAPPARATUS REQUIRED:S.No. Name of the item Type Range Quantity 1 IGBT Module - - 1 2 Inverter control module - - 1 3 CRO - - 1 4 Ammeter MI (0-5A) 1 5 Voltmeter MI (0-300V) 1 6 Patch cards - - -FORMULA USED: 1. Modulation index (m) is m = Ar / Ac 2. Output voltage V0 = m VsWhere Ar = Amplitude of reference signal Ac = Amplitude of carrier signal Vs = Source voltage Muthayammal Engineering college, Rasipuram. 33
  34. 34. Power Electronics and Drives Lab Manual Model graph Sinusoidal Pulse width modulation Voltage and current waveformsMuthayammal Engineering college, Rasipuram. 34
  35. 35. Power Electronics and Drives Lab ManualPrecaution: 1. Check whether AC main switch is off condition in both the trainer. 2. Check whether control module mode selector switch is in first position (Sine wave). 3. Check whether control module pulse release switch SW4 in control module is off position. 4. Check whether 24V AC switch is in off position.Procedure: 1. Make the connection as per the circuit diagram. 2. Switch on the AC main in both the trainer. 3. Measure the amplitude and frequency of sine wave and carrier triangular wave and tabulate it. Also adjust sine wave frequency to 50Hz. 4. Connect CRO probe to observe the load voltage and load current waveform. 5. Release the switch SW4 in the inverter control module and switch SW1 in the IGBT power module. 6. Measure the output voltage. 7. Using the amplitude POT to vary step by step, for each step note down the amplitude and frequency of sine wave and triangular waveform and also measure the output voltage and tabulate it. 8. Then find the theoretical output voltage by using the formula. Muthayammal Engineering college, Rasipuram. 35
  36. 36. Power Electronics and Drives Lab ManualTabulation: Vs=S.No. Amplitude of Amplitude of Modulation I0 V0 V0 carrier reference index Measured Measured Calculated triangular wave sine wave m= Ar/Ac in Amps in Volts in Volts (Ac) in volts (Ar) in volts V0 = m X Vs 1 2 3 4 5 6 Muthayammal Engineering college, Rasipuram. 36
  37. 37. Power Electronics and Drives Lab ManualINFERENCE:DISCUSSION QUESTIONS: 1. What is inverter? 2. Why we go for PWM? 3. What are the different types of PWM? 4. What is modulation index and what are the types? 5. What are the advantages of IGBT?RESULT: Muthayammal Engineering college, Rasipuram. 37
  38. 38. Power Electronics and Drives Lab ManualSINGLE PHASE AC VOLTAGE CONTROLLER USING SCR AND USING TRIAC CIRCUIT DIAGRAM USING TRIAC CIRCUIT DIAGRAM USING SCR Muthayammal Engineering college, Rasipuram. 38
  39. 39. Power Electronics and Drives Lab Manual SINGLE PHASE AC VOLTAGE CONTROLLER USING SCR AND USING TRIACAIM: To study the wave form for single phase ac voltage controller using SCR andTriac.APPARATUS REQUIRED:S.No. Name of the item Type Range Quantity 1 Triac Module - BTA12 1 2 SCR module - - 1 3 CRO - - 1 4 Ammeter MI (0-5A) 1 5 Voltmeter MI (0-300V) 1 6 Patch cards - - - 7 Transformer - (0-12V) 1FORMULA USED: 1 1 Sin2 2 1. The RMS output voltage is V0 RMS = Vs + 2Where = Firing angle Vs = Source voltage Muthayammal Engineering college, Rasipuram. 39
  40. 40. Power Electronics and Drives Lab Manual Model graph For ° = 60°Tabulation: Vs=S.No. Firing angle ( ) in I0RMS Measured in V0RMS Measured V0RMS Calculated degree Amps in Volts in Volts 1 2 3 4 5 6 Muthayammal Engineering college, Rasipuram. 40
  41. 41. Power Electronics and Drives Lab ManualProcedure: 1. Make the connection as per the circuit diagram. 2. Switch on the AC main in the triac module. 3. Connect CRO probe to observe the load voltage waveform. 4. Measure the output voltage and current. 5. Using the firing angle POT to vary step by step, for each step note down the waveform and also measure the output voltage and tabulate it. 6. Then find the theoretical output voltage by using the formula. 7. Repeat the same using SCR module. 8. Draw the wave forms.INFERENCE:DISCUSSION QUESTIONS: 1. What is voltage controller? 2. What are the different types of voltage controller? 3. In inductive load when the overlap angle is more than + then what will be the output? 4. What are the advantages and applications of voltage controller? 5. What type of commutation is preferred?RESULT: Muthayammal Engineering college, Rasipuram. 41

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