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Presentation on power distribution, operation and maintenance in comilla pbs 1

In this presentation discuss about Transformer, Sub-station and Maintenance System of Bangladesh Rural Electrification Board (BREB)

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Presentation on power distribution, operation and maintenance in comilla pbs 1

  1. 1. WELCOME TO MY PRESENTATION 1 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  2. 2. Presented by Kawsar Ahmed ID# 12105297 Program: BSEEE 10/1/2016Department of Electrical & Electronics Engineering of IUBAT2
  3. 3. Presentation on Power Distribution, Operation and Maintenance of Comilla Palli Bidyut Samity-1 3 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  4. 4. Contents  Objectives  Company Overview  Classification of Transformers  Various parts of Transformer  Power Distribution  Substation Equipments  Maintenance  Recommendation  Conclusion 10/1/2016Department of Electrical & Electronics Engineering of IUBAT4
  5. 5. Objectives Observation of rural distribution network About the system of BREB About the system of Palli Bidyut Samity About substation About transformer Maintenance system of BREB The main objective is that how to improve our Socio- Economic Development by utilizing electricity. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT5
  6. 6. Company Overview Rural Electrification Board Act, 2013 has been established instead of Rural Electrification Board Ordinance, 1977 and the name of Board is Bangladesh Rural Electrification Board which was responsible for electrifying rural Bangladesh. Vision Electricity for all by 2021. Mission Statement Provide quality electricity at grass root level in a democratic manner 10/1/2016Department of Electrical & Electronics Engineering of IUBAT6
  7. 7. Comilla Palli Bidyut Samity-1 Since its inception in 1981, Comilla Palli Bidyut Samity-1 is playing a vital role in Agricultural, Industrial and Socio-Economic Development of Comilla District. It is a consumer owned entity organized on the basic principles of Co-operative for distribution of electric power to its members and operates on No Loss - No Profit basis for the mutual benefits of all its Members. 7 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  8. 8. Organizational chart of Comilla Palli Bidyut Samity-1 Department of Electrical & Electronics Engineering of IUBAT8 10/1/2016
  9. 9. Consumer Information of Comilla PBS-1 Tariff-wise Consumer No (As on December 2014): Tariff Consumer No. Percentage (%) Cunsumer Connected in Current Month Billed Consumer Domestic 56500 72.73 206 52362 Commercial 6778 8.72 7 3146 Charitable Institute 1542 1.98 3 1468 Irrigation 6778 8.72 7 3146 General Power 6778 8.72 7 3146 Large Power 2 0 0 2 Street Light 6 0 0 3 10/1/2016Department of Electrical & Electronics Engineering of IUBAT9
  10. 10. Classification of Transformer According to procedure According to structure of core According to application According to frequency According to number of phase 10/1/2016Department of Electrical & Electronics Engineering of IUBAT10
  11. 11. Various parts of transformer  Conservator tank  Breather  Buchholz Relay  Radiator  Bushing  Arc horns  Tap Changer  Transformer Tank  Temperature meter  Oil level indicator  Name Plate  Insulating Materials 11 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  12. 12. Conservator Tank It is transformer oil storage tank and if the main tank oil reduces, the conservator will feed the oil to main tank. Its function is to ensure that the transformer tank is completely filled with oil every time. Fig: Conservator tank 12 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  13. 13. Breather It is connected to the conservator tank. It consists of silica gel material and silica gel absorbs the moisture from the air 13 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  14. 14. Buchholz Relay Buchholz relay is a safety device mounted on oil-filled power transformers equipped with conservator. Fig: Buchholz relay 14 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  15. 15. Radiator Radiators are used in a transformer to cool the transformer oil. Fig: Radiator 15 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  16. 16. A bushing is the arrangement of insulating material that allows the terminals of winding to bring out the transformer tank. The bushing is made of the highest quality of porcelain clad. Bushing 16 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  17. 17. Arc Horns Arc horn is a mechanical arrangement of metallic conductor to perform flashover in a guided way in order to protect bushing. Fig: Arc horns in the transformer bushing 17 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  18. 18. Tap Changer Tap changer in a transformer works like a switch, it connects or disconnects some coil turns of transformer winding so that voltage will be varied to make specific output. Fig: Tap changer 18 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  19. 19. Temperature meter Thermometer is used in transformer to measure the temperature inside the transformer tank. Fig: Dial type thermometer. 19 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  20. 20. Oil level indicator Oil level indicator indicates the oil level of the oil in conservator tank. Oil level indicator is connected with conservator tank. Fig: Oil level indicator 20 10/1/2016Department of Electrical & Electronics Engineering of IUBAT
  21. 21. Transformation Ratio Voltage ratio: Ep/Es = Np/Ns Current ratio: Ep/Es = Is/Ip or EpIp=EsIs Turns ratio: Ep/Es=Np/Ns=Is/Ip=a (a=Transformation Ratio) 10/1/2016Department of Electrical & Electronics Engineering of IUBAT21
  22. 22. Voltage regulation of transformer The difference between the output voltage at no load and the output voltage at rated load, divided by the output voltage at rated load, is called the voltage regulation of the transformer. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT22
  23. 23. Efficiency of transformer The output of a transformer is slightly less than the input because of the losses in the windings and the iron core. The ratio of the two, expressed as a percentage in the efficiency of the transformer. The output and input are expressed in watts or kilo-watts. Efficiency= Output/Input 10/1/2016Department of Electrical & Electronics Engineering of IUBAT23
  24. 24. Power Distribution System 10/1/2016Department of Electrical & Electronics Engineering of IUBAT24
  25. 25. Equipment of the Substation Power Transformers Bus-bar Insulators Isolating Switches Circuit Breaker Current Transformer (C.T) Potential Transformer (P.T) Fuse Feeder 10/1/2016Department of Electrical & Electronics Engineering of IUBAT25
  26. 26. Substation of Comilla Palli Bidyut Samity-1 10/1/2016Department of Electrical & Electronics Engineering of IUBAT26
  27. 27. Cont. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT27
  28. 28. Circuit Breaker In Comilla PBS-1 use auto circuit recloser (ACR) instead of circuit breaker. The rating of this ACR is 360 ampere and 33KV In this substation use two ACR one in the beginning and other in the ending point of substation. Both of them use for protection of the substation equipments though they use it as like switch. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT28
  29. 29. Lightning Arrester Lightning arrester use for protect from over voltage generally from thunder. In Comilla PBS-1 lightning arrester rating is 36KV. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT29 Fig: lightning arrester
  30. 30. CT and PT Current Transformer (CT) and Potential Transformer (PT) use for measuring current and voltage in high voltage and current. If we want to calculate higher voltage and current directly we will need bigger measuring instrument which will be higher cost. For this reason we use CT and PT. Here Current Transformer (CT) ratio is 600:5 Potential Transformer (PT) ratio is 6350:240 10/1/2016Department of Electrical & Electronics Engineering of IUBAT30
  31. 31. Fuse A fuse is a short pitch of metal, inserted in the circuit, which melts when excessive current flows thought it. Fuse generally use for protect from over current. In this substation use drop down fuse or air break fuse. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT31 Fig: fuse
  32. 32. Fuse characteristic 1. Low melting point. 2. High conductivity. 3. Least deterioration due to oxidation. 4. It carries the normal current without overheating. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT32 Fig: Fuse on over head line
  33. 33. Metering By the meter we can measure present current, voltage, power factor and maximum current, voltage etc. There was analog meter now they are using digital meter. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT33 Fig: meter
  34. 34. Isolator Isolator is like a switch. It use after the circuit breaker for ensure line are totally off mode. Mainly it use while substation or line need maintenance. Isolator has a manual system for operation. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT34 Fig: Isolator
  35. 35. Power Transformer Power Transformer is the main part of a substation. In Comilla PBS-1 use 10MVA power transformer. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT35
  36. 36. Voltage Regulator Voltage regulator is a device which can voltage up or down in a limitation range according to consumer demand. Actually voltage regulator is an auto transformer. In Comilla PBS-1 those transformer we use they can voltage up or down up to 10%. Fig: voltage regulator 10/1/2016Department of Electrical & Electronics Engineering of IUBAT36
  37. 37. Feeder Distribution feeder circuits are the connections between the output terminals of a distribution substation and the input terminals of primary circuits. The distribution feeder circuit conductors leave the substation from a circuit breaker. In Comilla PBS-1 have 9 feeders. Every feeder have own controlling system and also there has a display which shows maximum current, voltage, power factor and present current , voltage, power factor and the times its operation. It shows up to one month data. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT37
  38. 38. Maintenance Generally Comilla PBS-1 has three type of maintenance those are: 1. Substation maintenance 2. Line maintenance 3. Transformer maintenance 10/1/2016Department of Electrical & Electronics Engineering of IUBAT38
  39. 39. Substation Maintenance Every time substation needs maintenance if any problem arises. Without problem substation needs check all equipment of its quality and condition at least one time in a year. For maintenance purpose every time substation has to be shut down and line has to ground. First of all we have to check circuit breaker whether it has any problem or will be any problem. In the time of power transformer checking it have to be 1000MΩ of insulation test in megger. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT39
  40. 40. Line Maintenance There are many types of line maintenance: Some of maintenance has to be done immediately which mean whenever problem creates it had to be solved within four hours. Like over head line tear. For this type of problem immediately line has to be shut down. Some of maintenance can be done within 1-2 days like transformer problem. Some of maintenance can be done within a week like pole or tower got slanted to ground also trees came to the line. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT40
  41. 41. Transformer Maintenance In REB have two type of transformer maintenance. One is single phase transformer and another is power transformer. Thy repair single phase transformer in there PBS workshops. And power transformer repair in central workshop at Savar in Dhaka. I visited both place and saw maintenance. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT41
  42. 42. Single phase transformer If any transformer create problem it bring in the workshop and the worker see it what type of problem. Workers open the transformer and take transformer oil into a separate tank. Then separate every part from the transformer and mark every part by serial a number. If any transformer core damage badly which is not possible to repair those type of transformer rejected totally by workshop worker. If any transformer coils damage any other problem thy repair it. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT42
  43. 43. Cont. Now I am describing how the worker repairs a single phase transformer. After marking transformer every part when they get time to repair it they take it. The main part of a transformer is coil binding. In Comilla PBS-1 they bind coil manually by the worker. There have two type of coil one is primary coil and another is secondary coil. Secondary coil strong and hard but primary coil is thin and weak. That is why secondary coil normally do not damage. Primary coil damage normally and need to repair it. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT43
  44. 44. Figure: Coil binding 10/1/2016Department of Electrical & Electronics Engineering of IUBAT44
  45. 45. Figure: complete coil binding 10/1/2016Department of Electrical & Electronics Engineering of IUBAT45
  46. 46. Figure: core binding of transformer 10/1/2016Department of Electrical & Electronics Engineering of IUBAT46
  47. 47. In figure transformer coil into the tank After binding coil they bind core in transformer then they keep coil in heat chamber for absorbing moisture from the coil. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT47
  48. 48. Power transformer Single phase transformer and power transformer maintenance procedure are same. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT48
  49. 49. Figure: Power transformer coil binding in Savar central workshop. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT49
  50. 50. Recommendation During my internship I came to know that BREB faces lots of problems and also has some limitations. Transformer stealing is one of the major problems of BREB. For this reason transformer with chain and lock would be better also transformer can be installed in near of the people house.  BREB uses 3 single phase transformers for three phase distribution system which is costly and not efficient. Here three phase transformer would be more efficient. Comilla PBS-1 maintains substation manually it can be error in some time. Here automatic control system or programmable logic controller would be better and accurate. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT50
  51. 51. Cont. Comilla PBS-1 is operated by workers for maintenance system. Likes winding binding, core binding, core cutting etc. During my internship I saw a worker cut down his hand badly by core which is terrible thing. At least in some specific tasks machine would be superior. To complete my internship and to understand the technical terms properly Switchgear and Protective Relays and Power Station these two courses helped me. So if someone wants to do internship at BREB, they need to complete these two courses and stay in BREB’s quarter. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT51
  52. 52. Conclusion Bangladesh Rural Electrification Board (BREB) has the vast electricity distribution network all over the country and the electric power plants are connected with the transmission line to assure the continuity of electric power. The electric power plants produce power and feed in to the transmission line. All power plants are connected parallel with the transmission and distribution line. BREB is now more developing system day by day. As the part of this now BREB are using digital meter instead of analog meter for the consumer. However we have huge lack of electricity in Bangladesh but all of generation, grid supply, sub-station, consultancy, local member service of BREB is more efficient and taking important role to cover lack of electricity. 10/1/2016Department of Electrical & Electronics Engineering of IUBAT52
  53. 53. Thank you for your attention 10/1/2016Department of Electrical & Electronics Engineering of IUBAT53
  54. 54. Any Question 10/1/2016Department of Electrical & Electronics Engineering of IUBAT54

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