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  1. 1. WELCOME ABOUT Installation, Testing & Commissioning of 800 KVA Sub-Station at Euro Tech Bangladesh 1
  3. 3. CONTENTS  Introduction  Objective  Organizational Overview  Sub-Station  Single Line Diagram and Layout of 800KVA Sub-Station  Room Lay-Out of 800 KVA Sub-Station  Types of sub-Station  Range of Low Voltage Sub-Station  Equipment of 800KVA Sub-Station  DOFC  LA  Different Part of a Transformer  Technical Specification of 800KVA Sub-Station  HT Switchgear  LT Switchgear  Power Factor Improvement  Capacitor Bank of 480KVAR  Transformer Meggar Test  Earthing Test  Bus-Bar  LT Panel Bus-Bar Costing  Recommendation  Conclusion  Questions 3
  4. 4. INTRODUCTION • Electrical power is the key of modern civilization. • Power should be control and transfer. • Power products helps to control & transfer power. • Power products organization manufacture power products. • Power products operation. 4
  5. 5. OBJECTIVE  Broad Objectives: The Broad Objectives are mainly understand the Installation and operating of switchgear devices for getting vast knowledge about it.  Specific Objective:  Collecting practical Knowledge regarding distribution substation.  Study on Switchgear and protection in power system.  To realize the organizational management system of Euro Tech Bangladesh. 5
  6. 6. ORGANIZATIONAL OVERVIEW Name: Euro Tech Bangladesh Established: 2003 Chairman: Engr. Mohammed Rejaul Islam Ownership: ETB Group Location: H: 19, R: 11, S: 10 Uttara Dhaka Factory Location: Damardi, Baiddar Bazar Sonargaon, Narayangonj 6
  7. 7. COUNT……. Low Tension (LT) Switchgear High Tension (HT) Switchgear Transformer Power Factor Improvement (PFI) 7
  8. 8. A sub-station is a part of an electrical generation, transmission and distribution system. Sub-station transforms voltage from high to low between the generating station and consumers, electric power may flow through several substations at different voltage levels. SUB-STATION 8
  11. 11. TYPES OF SUB-STATION ON THE BASIS OF DESIGN Sub-Station Indoor Sub-Station Outdoor Sub-Station Foundation Mounted Sub-Station Pole Mounted Sub-Station 11
  12. 12. RANGE OF LOW VOLTAGE SUB-STATION Sub-Station Rating Protection 100 KVA HT Not Used 150 KVA 200 KVA 250 KVA 315 KVA HT Used with LBS (Load Break Switch) 400 KVA 500 KVA 630 KVA HT Used with VCB (Vacuum Circuit Breaker) 750 KVA 800 KVA 1000 KVA 1250 KVA 1500 KVA 2000 KVA 2500 KVA 3000 KVA 12
  13. 13. EQUIPMENT OF 800KVA, 11/0.415 KV SUB-STATION  11 KV, Dropout Fuse Circuit (DOFC)  11 KV, Lighting Arrester (LA)  800 KVA Distribution Transformer  630A, HT Switchgear  1250A, LT Switchgear  480 KVAr, PFI Plant  Earthing for Sub-Station 13
  14. 14.  DOFC is a combination of a fuse and a switch.  Used in primary overhead feeder lines and to protect distribution transformers from current surges and overloads. Technical Specification: Rated Voltage (Nominal) : 11KV Rated Maximum Voltage : 15KV Rated Frequency : 50Hz Rated Current (RMS) : 100A DROPOUT FUSE CIRCUIT (DOFC) 14
  15. 15. A lightning arrester is a protective device which conducts the high voltage surges on the power system to the ground. Technical Specification: Rated Voltage (RMS) : 12KV Frequency : 50Hz Minimum spark over voltage(RMS) : 14KV LIGHTING ARRESTER (LA) 15
  16. 16. DIFFERENT PARTS OF A TRANSFORMER Figure: Different Part of 800KVA Distribution Transformer Conservator Silica gel HT Terminal LT Terminal Name Plate Radiator Tank Earthing Point 16
  17. 17. SWITCHGEAR 630A, HT Switchgear 1250A, LT Switchgear 17
  18. 18. HT SWITCHGEAR Line In KV A IDMT Relay Connection CT CT CT PT PT Inner Part Upper Part Isolator H a n d l e VCB A Selector KV Selector 3-phase Line In 3-phase Line Out 18
  19. 19. TECHNICAL SPECIFICATION OF HT SWITCHGEAR 1 no. 11KV, 630A, TP spring charged energy mechanism operated fixed type Vacuum Circuit Breaker (VCB). 3 no. 11KV, Current Transformer (CT) having ratio 60/5/5A, for metering & Protection. 2 no. 11KV, Potential Transformer (PT) having ratio 11000/110V. 1 no. Triple pole IDMT relay for the Over Current, Short Circuit and Earth Fault Protection. 3 no. Indication Lamp. 19
  20. 20. LT SWITCHGEAR Line In Line In KA V MCCB/ACB MCCB/ACB Line In MCB MCB Line Out CT CT CT CT Inner Part Upper Part KA Selector V Selector H a n d l e 20
  21. 21. Incoming: 1 No. 1250A, TP MCCB with adjustable thermal overload & short circuit protection. 4 Nos. Current transformer having ratio 1250/5A with suitable accuracy & burden. 1 No. Ammeter having scale 0-1250A with selector switch. 1 No. Voltmeter having scale 0-500V with selector switch. 3 No. Phase indicating lamps. Outgoing: 1 no. 800A, TP MCCB with thermal over load and magnetic short circuit releases. 2 no. 400A, TP MCCB with thermal over load and magnetic short circuit releases. 1 no. 300A, TP MCCB with thermal over load and magnetic short circuit releases. 1 no. 100A, TP MCCB with thermal over load and magnetic short circuit releases. TECHNICAL SPECIFICATION OF LT SWITCHGEAR 21
  22. 22. Power Factor: The value of the cosine (cosθ) between the voltage and the current is called the power factor. POWER FACTOR IMPROVEMENT Voltage Current Improving power factor means reducing the phase difference between voltage and current. Since majority of loads are of inductive nature, they require some amount of reactive power for them to function. This reactive power is provided by the bank of capacitors installed parallel to the load. 22
  23. 23. Line In Line In Power Factor Regulator Power Capacitor Magnetic Contactor HRC Fuse PC HRC Fuse HRC Fuse M.C. HRC fuse Inner Part Upper Part PFI PANEL H a n d l e 23
  24. 24. 480 KVAR CAPACITOR BANK 24
  25. 25. 1 no. 12 stages automatic power factor correction relay with auto/manual selector switch, indication lamp & digital P.F. meter. 08 No. 50KVAr, 415V, TP dry type power capacitor bank with built in discharge resistor. 02 No. 25KVAr, 415 V, TP dry type Power capacitor bank with built in discharge resistor. 01 No. 15KVAr, 415V, TP dry type Power capacitor bank with built in discharge resistor. 01 No. 5KVAr, 415 V, TP dry type Power capacitor bank with built in discharge resistor (Fixed ) 12 No. TP, 415V Magnetic contractor of adequate rating. 39 No. HRC fuses with base of adequate rating. 12 No. Indication Lamps. TECHNICAL SPECIFICATION OF PFI PANEL 25
  26. 26. MAGNETIC CONTACTOR AND FUSE SELECTION DEPENDING ON KVAR Sl Capacitor Stage of Controller Magnetic Contactor(Amp) Fuse (Amp) 1 5 KVAR Fixed/Direct 12A 14 A 2 10 KVAR 1 25A 30 A 3 15 KVAR 2 32A 40 A 4 25 KVAR 3 40A 63 A 5 25 KVAR 4 40A 63 A 6 50 KVAR 5 85A 125 A 7 50 KVAR 6 85A 125 A 8 50 KVAR 7 85A 125 A 9 50 KVAR 8 85A 125 A 10 50 KVAR 9 85A 125 A 11 50 KVAR 10 85A 125 A 12 50 KVAR 11 85A 125 A 13 50 KVAR 12 85A 125 A 26
  27. 27. Here the insulation resistance varies the different condition. Mainly in transformer have three special part LT winding, HT winding, and Transformer body. That should be like that value • HT- LT: 2000MΩ • HT- Body: 2000MΩ • LT- Body: 2000MΩ TRANSFORMER MEGGAR TEST 27
  28. 28. EARTHING TEST Earthing Metarials:  Earthing conductor size should be 2-4 SWG  Earthing result will be less than 1 ohm  LA and X-F neutral grounding should be separated from the main mesh  Depth of LA & X-F neutral grounding boring point at least 25 M  X-F body will be grounded at least 2 points Earthing Test (Earth Tester No: 26180204)  Earthing resistance in Electrode-1 = 0.93 Ohm  Earthing resistance in Electrode-2 = 0.88 Ohm  Earthing resistance in Electrode-3 = 0.86 Ohm  Earthing resistance in Electrode-4 = 0.92 Ohm 28
  29. 29. BUS-BAR Bus-Bar is a type of electrical junction in which all the incoming and outgoing electrical current meets. Thus, the electrical bus bar collects the electrical energy at one location. LT Panel Bus-Bar Selection: We will multiply incoming breaker capacity 1250A by 1.25. 1250 × 1.25 = 1562.5 A We know that, 2 Amp = 1 mm2 1562.5 A = 781.25 mm2 So according to 781.25 mm2 we need (65 ×12) mm2 Bus bar but this is not available in market so we will take (70×12) mm2. N.B: A little or more increasing is good for Bus bar but not decreasing from rated value. 29
  30. 30. LT PANEL BUS-BAR COSTING We need 1 m length bus bar then N.B.: Here we choose (70×12) mm2 Bus bar L = 1 m = 1000 mm W = 70 mm H = 12 mm So, V = L x W x H V = (1000× 70× 12) mm3 V = 840000 mm3 V = 0.00084 m3 Now we know that the density of cupper is, ρ = 8960 kg/m3 So Mass, m = ρ v m = 8960 kg/m3 × 0.00084 m3 m = (7.5) kg Let, 1 kg = 800 Tk. 7.5 kg = 6000 Tk. 30
  31. 31. RECOMMENDATION  To avoid fault in Substation, ELB should take care of overall test on substation like, Transformer magger test, Dimension of substation equipment, Earth test etc.  Transformer oil and silica gel should be checked after one month or any type of fault. Oil should be changed if it is decomposed.  Need separation between Transformer and LT switchgear for their safety purpose.  Depends on ambient temperature we should manufactured transformer for in terms of area, to minimize cost.  The direct capacitor which used in PFI, it should be used low rating capacitor to avoid assess by DESCO, BREB, DPDC etc. 31
  32. 32. CONCLUSION For a technical service provider plant I&C activities are very important as its service mostly depends on the availability of its equipment. By using proper I&C schedule of substation cost can be reduced and supply can be increased. I&C are traditionally classified as a part of output that comes from the system. During my internship, I could learn about Substation on, its Installation, Testing and Commissioning. During this study, it has been observed from the organizational point of view where it has been implemented. 32
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