Study of a Cogeneration Plant in Sugar Mill by using Bagasse as a Fuel
1C.Dinakaran, Assistant Professor, Dept. of EEE, Sri Venkateswara College of Engg. & Tech., Chittoor
2S.Purushotham, Assistant Engineer, S.N.J Sugars and Products Limited, Nelavoy Village, Chittoor
3S.M.Harikrishna, Trainee Engineer, S.N.J Sugars and Products Limited, Nelavoy Village, Chittoor
1dina4karan@gmail.com, 2purushotamsevoor@gmail.com, 3smharikrishna028@gmail.com
Abstract — Bagasse cogeneration describes the use of fibrous sugarcane waste, bagasse to cogenerate heat and electricity at high efficiency in sugar mills. Proposed work is a case study on sugarcane industry and economics is worked out for advanced cogeneration power system. In generally, different kinds of co-generation plants are available based on products in industry and bagasse is derived from several types of the cogeneration plant. By replacing low-efficiency mill turbines with hydraulic drives and DC motors, cogeneration power increases in sugar mill to operate at high efficiency (65-70%). This replacement can aid increase of power to a grid, resulting in additional revenue for sugar plant. The research evaluates the technical feasibility and economic viability of reconfiguring the sugar industries towards cogeneration and also quantifies the emissions from Bagasse cogeneration. The total electric power that can be produced and fed to the national grid, the economic issues and the issues of emissions.
Key Words — Bagasse, Boiler, Feed Water Heater, Condenser, Turbine, Chimney, ID Fan, S.A Fan, F.D Fan.
I. INTRODUCTION
Fig.1 shows the line diagram of steam/thermal power plant [1]. The fuel for a thermal power plant is coal/Bagasse. The coal is pulverized in coal pulverization plant for required sizes to feed in the boiler unit of steam/thermal power plant [2]. The water in boiler gets heated once the coal/bagasse is fired in the furnace. Gradually the water gets converted into steam after heating it up to 4800C. The steam flows through the superheater such that the moisture content in the steam gets evaporated and turn into super saturated steam [3]. The hot flue gas from the boiler is fed to superheater which increases the temperature of the superheater and removes the moisture content. The flue gas flowing through super heater flows through economizer and air pre-heater. The main function of the economizer is that it will increase the temperature of the feed water by utilizing the heat from the hot flue gases [4].
The feed water is again sent to the boiler for conversion of steam [5]. The air pre-heater increases the temperature of the air supplied for coal burning by deriving heat from flue gases [6]. By preheating the air there will be an increase in thermal efficiency and increase in steam capacity per square meter of boiler surface. The super saturated steam from superheater is fed to the impulse reaction turbine by means of the main valve [7]. The valve placed in between superheater and the turbine is for limiting the excess flow level of steam to the turbine. The turbine converts steam energy into mechanical energy [8].
The turbine is coupled with the Turbo Alternator with the help of couplings. The Turbo Alternator converts mechanical energy into electrical energy [9]. The generated electrical energy is stepped up by using power transformer and feed to bus bar with various protection systems.
Fig. 1 Line Diagram of Steam Power Plant
The 132KV power generated is sent to the nearest substation. The exhaust steam from steam turbine is again converted into water in the condenser and it is sent to the cooling tower with the water from the river/pond, where the water is cooled and sent to circulating water pump [10]. Again the water is sent through condensate extraction pump to LP water heater and then to HP feedwater heater. Then the water is sent to economizer and from there it is circulated to boiler [11]. This process repeats simultaneously. The ash in the furnace is sent to ash handling plant where it is mixed in water in order to stop the spreading of the ash in the air and it is sent to ash storage plant. The electrostatic precipitator collects the dust from the furnace and sends the exhaust gases through a chimney.
II. COGENERATION PLANT ACCESSORIES EQUIPMENT
A. Boiler
Fig. 2 Babcock and Wilcox Boiler
The Babcock and Wilcox boiler is a water tube, internally fired and natural water circulation boiler. The steam and water drum which is placed about 8Meter in length and 2Meter in diameter. It is inclined at an angle of 10° to 15° from the normal position to promote water circulation. Fig.2 shows the Babcock and Wilcox boiler, Coal is fed to the grate through the fire door and is burnt. The hot flue gases rise upward and pass across the left side portion of the water tubes. The baffles are used to deflect the hot gases in the zigzag manner and for an upward and downward direction of the flue gases movement over the water tubes along with superheater. The part of the water tubes which is just above the furnace is heated to a higher temperature so that the water density is decreased. Due to a decrease in density, the water rises into the drum through the uptake header. In this position, the water and steam are separated in the drum. In fact, the steam is having lighter weight compared to water. So it is collected in the upper parts of the drum. The circulation of water is obtained by convective currents and it is known as natural circulation. The steam is taken from the drum through a tube to the superheater for superheating the steam. A damper is fitted to regulate the flue gas outlet and the boiler is fitted with necessary mountings.
B. Super Heater
The steam produced in the boiler is wet and is passed through a superheater where it is dried and superheated (i.e.., the steam temperature increased above that of boiling point of water) by the flue gases on their way to the chimney. Superheating provides two principal benefits. Firstly, the overall efficiency is increased and secondly, too much condensation in the last stages of a turbine (which would cause blade corrosion) is avoided. The superheated steam from the superheater is fed to steam turbine through the main valve. The Superheater is used to increase the temperature of saturated steam without raising its pressure and it is placed on the hot flue gases path in the furnace.
C. Impulse – Reaction Turbine
Fig. 3 Impulse – Reaction Turbine
Fig.3 shows the impulse -reaction turbine. This type of turbine is a combination of impulse and reaction turbine. The total pressure drop of the steam from the boiler to condense pressure is divided into a number of stages as done in pressure compounding and velocity obtained in each stage is also compounded. For a given pressure drop, this type of turbines is designed in compact sizes. The dry and superheated steam from the superheater is fed to the steam turbine through the main valve. The heat energy of steam when passing over the blades of a turbine is converted into mechanical energy. After giving heat energy to the turbine, the steam is exhausted to the condenser which condenses the exhausted steam by means of cold water circulation.
D. Alternator
Fig. 4 Turbo Alternator
Fig.4 shows the turbo alternator. The steam turbine is coupled to an alternator. The alternator converts mechanical energy of turbine into electrical energy. The electrical output from the alternator is delivered to the bus bars through transformer, circuit breakers and isolators.
E. Exciter
Fig. 5 Exciter
Exciters are nothing but the D.C. generators. Its main function is to supply DC power to the field system / rotor. These are mounted on the same shaft of the Alternator. The capacity of the exciter is about 0.5% to 3% of the alternator capacity. The exciter was a small DC generator coupled to the same shaft as the rotor. Therefore, when the rotor rotates this exciter produces the power for the electromagnet. Control of the exciter output is done by varying the field current of the exciter. This output from the exciter then controls the magnetic field of the rotor to produce a constant voltage output by the generator. This DC current feeds to the rotor through slip rings as shown in Fig.5.
F. Power Transformer
Fig. 6 Power Transformer
A transformer is a static device which transfers the electrical power or energy from one alternating current circuit to another with the desired change in voltage or current and without any change in the frequency. A power transformer is used in a substation to step-up (or) step-down the voltage. Fig.6 shows the substation transformer which is installed upon the length of rails fixed a concrete slabs having foundation 1 to 1.5 m deep.
G. Lightning Arrester
Fig. 7 Lightning Arrester
The Fig.7 shows the substation lightning arrestors. Lightning arrestors are the instrument that is used in the incoming feeders so that to prevent the high voltage entering the main station. This high voltage is very dangerous to the instruments used in the substation. Even the instruments are very costly, so to prevent any damage lightening arrestors are used. The lightening arrestors do not let the lightning fall on the station. If some lightening occurs the arrestors pull the lightning and ground it to the earth. In any substation/generating station the main important is of protection which is firstly done by these lightning arrestors. The lightening arrestors are grounded to the earth so that it can pull the lightning to the ground. The lightening arrestor works with an angle of 30° to 45° making a cone.
H. Potential Transformer
Fig. 8 Potential Transformer
The Fig.8 shows the substation potential transformer. There are two potential transformers used in the bus connected both sides of the bus. The potential transformer uses a bus isolator to protect itself. The main use of this transformer is to measure the voltage through the bus. This is done so as to get the detail information of the voltage passing through the bus to the instrument. There are two main functions in it
a. Measurement
b. Protection
I. Current Transformer
Fig. 9 Current Transformer
Fig.9 shows current transformer. Current transformers are basically used to take the readings of the currents entering the substation. This transformer steps down the current from 800Amps to 1Amp. The current transformer works on the principle of variable flux. This is done because we have no instrument for measuring of such a large current. The main use of this transformer is
a. Distance Protection
b. Backup Protection
c. Measurement
J. Isolator
Fig. 10 Isolator
Fig.10 shows isolator, the use of this isolator is to protect the transformer and the other instrument in the line. The isolator isolates the extra voltage to the ground and thus any extra voltage cannot enter the line. Thus an isolator is used after the bus also for protection.
K. Bus bar
Fig. 11 Bus Bar
A bus-bar term is used for a bar (or) conductor carrying an electric current to which many connections may be made as shown in Fig.11.
L. Relay
Fig. 12 Relay Panel
Fig.12 shows a relay panel. A relay is a device which detects the fault and initiates information to the circuit breaker to isolate the detective element from the rest of the system.
M. SF6 Circuit Breaker
Fig.13 shows a sulphur hexafluoride circuit breaker. The sulphur hexafluoride gas (SF6) is an electronegative gas and has a strong tendency to absorb free electrons. The contacts of the breaker are opened in a high-pressure flow of sulphur hexafluoride (SF6) gas and an arc are struck between them. The gas captures the conducting free electrons in the arc to form relatively immobile negative ions. This loss of conducting electrons in the arc quickly builds up enough insulation strength to extinguish the arc. The sulphur hexafluoride (SF6) circuit breakers have been found to be very effective for high power and high voltage service.
Fig. 13 Sulphur Hexafluoride Circuit Breaker
III. PROTECTIVE SYSTEMS
A. Alternator Protection
The protections that are used in a thermal power plant for a generator or alternator are as follows,
Differential protection
Reverse power protection
Over frequency protection
Stand by earth fault
Loss of excitation protection without u/v
Loss of excitation protection with u/v
MET protection PT fuse fail generator negative PH sequence-1
Generator negative PH sequence-2
Under Frequency protection-1
Under Frequency protection-2
Voltage restraint o/c relay
Generator over voltage protection-1
Generator over voltage protection-2
Generator under voltage protection
Overload protection
AVR PT fuses fail
Emergency trip
GRP self-test fail
GRP power supply fail
Over fuse protection
Class-A trip
Direction sensitive E/F trip
MIT overload relay
B. 132KV Switch Yard Protections
VT fuse fails relay
Standby earth fault
Over current relay R
Over current relay y
Over current relay B
Neutral displacement relay
Overvoltage relay
Under voltage relay
Buchholz trip relay
Winding temperature trip relay
Oil temperature trip relay
Oil surge trip relay
PRD alarm
MOG alarm
Buchholz alarm relay
Winding temperature alarm
Oil temperature alarm
LV master trip relay
HV master trip relay
Trip relay coils supervision relay
11KV Tie CB coil supervision relay
132KV CB trip coil-1 supervision relay
132KV CB trip coil-2
PRD trip relay
IV. STANDARDS TO GENERATE POWER IN SUGAR MILL BY USING BAGASSE/COAL
As per the industrial records, some of the standard values are mentioned below,
If one tonne of bagasse is burnt 2.2 tonne of steam is produced.
If one tonne of coal is burnt 4 tonne of steam is produced as per the calorific value of coal.
To generate 1MW of power 4 tonne of steam is required.
To generate 20MW of power 80 tonne of steam is required.
The boiler used for steam production is Thermal Babcock and Wilcox Boiler with an operating capacity of 80 TPH, the pressure of 67 ATA, the temperature of 487±50C.
If one tonne of a cane is crushed 300Kg of bagasse is produced.
In a day to generate 20MW of power 50 tonne of de-mineralized water is used.
To generate 1MW of power 6.55 tonne of water is required.
To generate 20MW of power 131 tonne of water is required.
The moisture content in the bagasse must be from 490 to 550C.
V. VARIOUS PARAMETERS OF STEAM TURBINE
S.NO TURBINE PARAMETERS UNITS 6:00 AM 7:00AM
1. TURBINE LOAD MW 11.1 11.2
2. TURBINE SPEED RPM 7122 7167
3. INLET STEAM PRESSURE KG/CM2 63 62
4. INLET STEAM TEMPERATURE °C 477 476
5. INLET STEAM FLOW TPH 71 72
6. AFTER FIRST STAGE STEAM PRESSURE KG/CM2 32 33
7. HP EXTRACTION STEAM PRESSURE KG/CM2 7.0 6.9
8. HP EXTRACTION STEAM TEMPERATURE °C 235 230
9. HP EXTRACTION STEAM FLOW TPH 8.4 8.6
10. LP EXTRACTION STEAM PRESSURE KG/CM2 1.02 1.01
11. LP EXTRACTION STEAM TEMPERATURE °C 125 124
12. LP EXTRACTION STEAM FLOW TPH 60 63
13. AUXILIARY STEAM PRESSURE KG/CM2 9.9 9.9
14. AUXILIARY STEAM TEMPERATURE °C 431 432
15. SEALING STEAM PRESSURE KG/CM2 0.05 0.05
16. SEALING STEAM TEMPERATURE °C 245 245
17. EXHAUST STEAM PRESSURE KG/CM2 -0.93 -0.93
18. EXHAUST STEAM TEMPERATURE °C 43 43
19. CONDENSATE FLOW TPH 4 6
20. HP VALVE DEMAND % 69 70
21. HP VALVE POSITION MM 27 27
22. LP VALVE DEMAND % 30 29
23. LP VALVE POSITION MM 7/5 7/5
24. CONTROL OIL PRESSURE KG/CM2 9.5 9.6
25. LUBE OIL PRESSURE KG/CM2 1.9 1.9
26. DIFFERENTIAL PRESSURE ACROSS FILTERS KG/CM2 0.45 0.45
27. OIL COOLER OIL INLET TEMPERATURE °C 58 58
28. OIL COOLER OIL OUTLET TEMPERATURE °C 42 42
29. CONDENSER CW INLET PRESSURE KG/CM2 0.80 0.80
30. CONDENSER CW OUTLET PRESSURE KG/CM2 0.65 0.65
31. CONDENSER COOLING INLET TEMPERATURE °C 32 32
32. CONDENSER COOLING OUTLET TEMPERATURE °C 35 35
33. OIL COOLER COOLING WATER INLET TEMPERATURE °C 32 32
34. OIL COOLER WATER OUTLET TEMPERATURE °C 35 35
35. MAIN OIL TANK LEVEL MM N N
36. OIL OVERHEAD TANK OVERFLOW YES/NO Y Y
37. LUBE OIL SUPPLY PRESSURE AT TURBINE THRUST BEARING KG/CM2 0.45 0.45
38. LUBE OIL RETURN TEMPERATURE AT TURBINE THRUST BEARING °C 54 54
39. LUBE OIL RETURN TEMPERATURE AT TURBINE FRONT BEARING °C 55 55
40. LUBE OIL SUPPLY PRESSURE AT TURBINE FRONT BEARING KG/CM2 0.95 0.95
41. LUBE OIL SUPPLY PRESS. AT TURBINE REAR BEARING KG/CM2 0.69 0.69
42. LUBE OIL SUPPLY PRESSURE AT GEAR BOX KG/CM2 1.18 1.18
43. LUBE OIL SUPPLY PRESSURE AT GENERATOR FRONT BEARING KG/CM2 0.69 0.69
44. LUBE OIL SUPPLY PRESSURE AT GENERATOR REAR BEARING KG/CM2 0.63 0.63
45. LUBE OIL RETURN TEMPERATURE AT TURBINE REAR BEARING °C 60 60
46. LUBE OIL RETURN TEMPERATURE AT GEN GEAR BOX °C 51 51
47. LUBE OIL RETURN TEMPERATURE AT GENERATOR FRONT BEARING °C 50 50
48. LUBE OIL RETURN TEMPERATURE AT GENERATOR REAR BEARING °C 46 46
49. TURBINE THRUST BEARING TEMPERATURE (ACTIVE) (A) °C 54 54
50. TURBINE THRUST BEARING TEMPERATURE (ACTIVE) (D) °C 54 54
51. TURBINE FRONT BEARING TEMPERATURE (F) °C 87 87
52. TURBINE REAR BEARING TEMPERATURE (I) °C 69 69
53. GEAR PINION FRONT BEARING TEMPERATURE (K) °C 80 80
54. GEAR PINION REAR BEARING TEMPERATURE (J) °C 87 87
55. GEAR PINION WHEEL FRONT BEARING TEMPERATURE (M) °C 67 67
56. GEAR PINION WHEEL REAR BEARING TEMPERATURE (W) °C 63 64
57. GENERATOR FRONT BEARING TEMPERATURE (P) °C 60 60
58. GENERATOR REAR BEARING TEMPERATURE (Q) °C 57 57
59. HOT WELL TEMPERATURE °C 43 43
60. HOT WELL LEVEL % 33 32
61. CONDENSER VACUUM KG/CM2 -0.93 -0.93
62. CEP SUCTION PRESSURE KG/CM2 -0.82 -0.82
63. CEP DISCHARGE PRESSURE KG/CM2 7.6 7.6
64. CONDENSATE TEMPERATURE BEFORE EJECTOR °C 42 42
65. CONDENSATE TEMPERATURE AFTER EJECTOR °C 58 58
66. CONDENSATE BEFORE GLAND STEAM CONDENSER °C 55 55
67. CONDENSATE TEMPERATURE AFTER GLAND STEAM CONDENSER °C – –
68. GENERATOR AIR COOLER WATER INLET TEMPERATURE °C 32 32
69. GENERATOR AIR COOLER WATER OUTLET TEMPERATURE °C 34 34
70. AXIAL DISPLACEMENT MM 0.22/0.26 0.25/0.26
71. TURBINE FRONT SHAFT VIBRATION MICRONS 65/75 66/73
72. TURBINE REAR SHAFT VIBRATION MICRONS 27/35 28/35
73. GEAR PINION SHAFT VIBRATION (HSS) MICRONS 22/33 28/31
74. GEAR WHEEL SHAFT VIBRATION (LSS) MICRONS 18/19 16/18
75. GENERATOR FRONT SHAFT VIBRATION MICRONS 33/25 37/26
76. GENERATOR REAR SHAFT VIBRATION MICRONS 24/33 21/35
77. HP SECONDARY OIL PRESSURE KG/CM2 3.0 3.0
78. LP SECONDARY OIL PRESSURE KG/CM2 2.6 2.6
VI. CONCLUSION
Bagasse otherwise a refuse, if used as cogeneration fuel is proved to have been technically feasible, economically viable for the competitive industrial environment of sugar industries, environmentally friendly because of greenhouse neutral emissions and acceptable regarding social matters. By using this type of plants we save natural resources like coal, water because the byproduct of sugar cane i.e., bagasse is used as raw material for combustion. By erecting the plant as per the design it results in the reduction of atmospheric pollution and increases the power generation and the efficiency of the plant increases. By these designs, the step by step process of power generation will be in a progressive level such that interruption in power generation will not happen
and fault identification and rectification will be easy for any working individual.
References
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APPENDIX
TYPES OF EQUIPMENT USED IN COGENERATION PLANT
AVR PANEL:
SL.NO : S30381
MAKE : BHEL
NOMINAL OUTPUT : 7.12 A, 78.4 V
CEILING OUTPUT : 11.27 A, 150 V
LOAD : EXCITER HELP
COOLING : AN
MAXIMUM AMBIENT : 50°C
AUXILIARY DC SUPPLY : 1100
AUXILIARY AC SUPPLY : 415 V, 3 PHASE, 50HZ
NEUTRAL GROUNDING RESISTORS:
MAKE : NATIONAL SWITCH GEARS, CHENNAI-98
SYSTEM VOLTAGE : 125 KV, AC, 50HZ
FAULT CURRENT : 100 A
DURATION : 30 SECOND
TOTAL RESISTANCE : 63.5 OHMS
ELEMENT MAT./TYPE : COIL WOUND / PUNCHED
AMBIENT TEMPERATURE : 50°C
TEMPERATURE RISE : 25°C
SL.NO./YEAR OF MFG. : NGR/T/38/2000
REFERENCE DRG. : NGP-3-1868
ESP ELECTRONIC CONTROLLER-1:
MODEL : ADOR CORONA
MAKE : ADOR POWERTRON LTD., PUNE
SL.NO. : 0796-01-03-2001
RATED INPUT VOLTAGE : 415 V, AC, 50 HZ
RATED INPUT CURRENT : 120 A
RATED OUTPUT VOLTAGE : 95 KV (PEAK) DC
RATED OUTPUT CURRENT : 500 MA DC
ESP ELECTRONIC CONTROLLER-2:
MODEL : ADOR CORONA
MAKE : ADOR POWERTRON LTD., PUNE
SL.NO. : 0795-01-03-2001
RATED INPUT VOLTAGE : 415 V, AC, 50 HZ
RATED INPUT CURRENT : 120 A
RATED OUTPUT VOLTAGE : 95 KV (PEAK) DC
RATED OUTPUT CURRENT : 500 MA DC
FLOAT CUM BOOST BATTERY CHARGER-1:
TYPE : 110TP150
INPUT : 415 V, AC,50 HZ
OUTPUT : 110 V,150 A, AC
SL.NO. : 2037-1195
MANUFACTURING : JUNE 2001
FLOAT CUM BOOST BATTERY CHARGER-2:
TYPE : 110TP150
INPUT : 415 V, AC,50 HZ
OUTPUT : 110 V,150 A, AC
SL.NO. : 2038-1195
MANUFACTURING : JUNE 2001
INCOMER FROM STG FEEDER: (VCB)
VOLTAGE : 11 KV
FREQUENCY : 50 HZ
CIRCUIT CURRENT : 2000 A
BUS BAR CURRENT : 2000 A
TYPE : VM12
SL.NO. : BP9055146
MAKE : BHEL, BHOPAL
SPEC. : IS3427 / IEC 298
TO GENERATOR TRANSFORMER FEEDER: (VCB)
VOLTAGE : 11 KV
FREQUENCY : 50 HZ
CIRCUIT CURRENT : 2000 A
BUS BAR CURRENT : 2000 A
TYPE : VM12
SL.NO. : BP9055145
MAKE : BHEL, BHOPAL
SPEC. : IS3427 / IEC 298
TURBO GENERATOR:
MAKE : BHEL, HYDERABAD
DRIVE : ST
KVA : 25500
KW : 20400
POWER FACTOR LAG : 0.8
FREQUENCY : 50
RPM : 1500
PHASE : 3 AC
CONNECTION : STAR
STATOR VOLTS : 11000
STATOR AMPS : 1338
ROTOR VOLTS : 93
ROTOR AMPS : 838
AMBIENT AIR : 39°C
COOLING : CACW
DUTY : CONT.
ALTITUDE : <1000M
TOTAL WEIGHT : –
OVER SPEED : 10%
GAS PRESSURE : NA
WINDING INSULATION : CLASS F
STANDARD : IEC – 34, IS : 4722
TYPE : TA11 1240 12P – 15
PROTECTION : IP- 54
SL.NO. : 1408
YEAR : 2001
BRUSHLESS EXCITER:
MAKE : BHEL
TYPE : EAR 80/9 -15/16 – 217
INSULATION CLASS : F
SL.NO. : 10558
YEAR : 2001
STANDARD NO. : IS : 4722
KW : 94
CONT. VOLTS : 102
CONT. AMPS : 922
RPM : 1500
EXCITATION W : 544
EXCITATION V : 77.41
EXCITATION A : 7.03
PERMANENT MAGNET GENERATOR:
MAKE : BHEL
TYPE : EAP11/ 16-15/6
KVA : 1.5
VOLTAGE : 220
AMPS : 3.94
FREQUENCY : 75 HZ, 3 PHASE
RPM : 1500
UPS PANEL-1:
CAPACITY : 15 KVA
INPUT : 415 V, 50 HZ
OUTPUT : 230 V
MAKE : HI – REC
SL.NO. : 01082296
ISOLATOR WITH EARTH SWITCH DEVELOPER ENDMAIN SWITCH:
MAKE : VERSATECK, HYDERABAD
VOLTS : 132 KV
AMPS. : 1250 AMPS
SL.NO. : 673
EARTH SWITCH:
MAKE : VERSATECK, HYDERABAD
VOLTS : 132 KV
AMPS : 1250 AMPS
SL.NO. : 671
R-PHASE CURRENT TRANSFORMER- DEVELOPER END:
CURRENT RATIO : 250 – 125/ 1-1-1 AMPS
FREQUENCY : 50 HZ
HSV : 145 KV
INSULATION CLASS : 275 KV RMS / 650 KV (PEAK)
SHORT TIME CURRENT : 31.5 KA FOR 1 SEC
QUANTITY OF OIL : 105 Ltrs.(APPROXIMATELY)
TOTAL WEIGHT : 290 Kg
TOTAL GREEPAGE DISTANCE : 3625mm (MINIMUM )
STANDARD : IS: 2705 (1992)
MAKE : ITC
SL.NO. : 9058-07
CORE SEC. CONN. PRL CONN. RATIO AMPS BURDEN CLASS RCT/N OHMS VK VOLTS IX MA
VK /2
1 1S1-1S2
1S1-1S3 P1-P2
P1-P2 125/1
250/1 –
– PS
PS <=2.5
<=5 120(RCT+2) 30 MA
2 2S1-2S2
2S1-2S3 P1-P2
P1-P2 125/1
250/1 20VA
20VA 5P20
5P20 –
– –
– –
–
3 3S1-3S2
3S1-3S3 P1-P2
P1-P2 125/1
250/1 20VA
20VA 0.2
0.2 –
– –
– –
–
SF6 CIRCUIT BREAKER DEVELOPER END:
MAKE : ALSTOM
SL.NO. : 031110
RATED VOLTS : 145 KV
NORMAL CURRENT : 3150 A
FREQUENCY : 50 HZ
LIGHTING IMPULSE WITHSTAND VOLTAGE : 650 KV (PEAK)
FIRST POLE CLEAR FACTOR : 1.5
SHORT TIME WITHSTAND CURRENT : 31.5 KA
DURATION OF SHORT CURRENT : 3 Sec
SHORT CIRCUIT BREAKING CURRENT
SYMMETEICAL : 31.5 KA
ASYMMETRICAL : 37.2 KA
SC MAKING CURRENT : 80 KA(PEAK)
OUT OF PHASE BREAKING CURRENT : 0-0.35-CO-3 MIN – CO
OPERATING SEQUENCE : 6.3 BAR
SF6 GAS PRESSURE AT 20°C, 1013npa : 8.7 Kg
TOTAL MASS OF SF6 GAS : 1300 Kg
TOTAL MASS OF BREAKER :
REF. STD. : IEC – 56
YEAR : 2002
TYPE : FAF1 – 2
TRIP COIL : 110 V, DC
CLOSE COIL : 110 V, DC
MOTOR : 230 V, 50 HZ, AC
HEATER : 230 V,50 HZ, AC
OUTDOOR VACCUM CIRCUIT BREAKER:
MAKE : ALSTOM
TYPE : PCOB – 15
SL.NO. : 13127 / P1
VOLTS : 12 KV
BREAKING CAPACITY : 25 KVA
PHASE : 3
FREQUENCY : 50 HZ
MAKING CAPACITY : 62 KA (PEAK )
SHORT TIME RATING : 25 KA
SHUNT TRIP : 110 V DC
CLOSE : 110 V DC
MOTOR SUPPLY : 230 V AC
MECH. M : SPMX – 500 FORM
MONTH / YEAR : 05 / 02
25MVA POWER TRANSFORMER:
TYPE OF COOLING : ONAN
RATED POWER LV & HV : 25 MVA
RATED VOLTS
HV : 132 KV
LV : 11 KV
RATED LINE AMPS
HV : 109.5 A
LV : 13137 A
NUMBER OF PHASE : 3
MAXIMUM TEMP. RAISE OVER ON AMBIENT OF 50°C
TOP OF OIL : 50°C
AVERAGE WINDING : 55°C
IMPEDANCE VOLTAGE
TAP 1 : 10.94%
TAP 9 : 10.28%
TAP 25 : 9.63%
MAKERS SL.NO. : B – 29622
REF. NO. : T – 6496
TYPE : DOUBLE WOUND
VECTOR GROUP : YNd1
FREQUENCY : 50 HZ
INSULATION
HV SIDE KV : L1650AC275
LV SIDE KV : L175AC28
HVN KV : AC38
CORE AND COIL MASS : 29000 Kg
TANK AND FITTING MASS : 17000 Kg
MASS OF OIL : 14500 Kg
TOTAL MASS : 60500 Kg
TRANSPORT MASS(OIL FILLED) : 48000 Kg
DIAGARM DRG. NO. : A218223
YEAR : 2002
VOLUME OF OIL : 16800 Ltrs
25MVA POWER TRANSFORMER OLTC:
SL.NO : 5002696 / 2001
TYPE : MIII350 / 60 / B / 14273W
RESISTANCE : 4.3 OHMS
MAKE : BHEL
OLTC MOTOR:
VOLTS : 415 V
FREQUENCY : 50 HZ
KW : 1.1
CONTROL SUPPLY : 110 V, 50 HZ
POT : 1000 OHMS
2.5MVA DISTRIBUTION TRANSFORMER-1:
TYPE OF COOLING : ONAN
RATED POWER LV & HV : 2.5 MVA
RATED VOLTS
HV : 11 KV
LV : 0.43 KV
RATED LINE AMPS
HV : 131.2 A
LV : 3333.4 A
NUMBER OF PHASE : 3
MAXIMUM TEMP. RAISE OVER ON AMBIENT OF 50°C
TOP OF OIL : 50°C
AVERAGE WINDING : 55°C
IMPEDANCE VOLTAGE HV / LV : 6.793 %
MAKERS SL.NO. : D – 3262
REF. NO. : TIP – 1001
VECTOR GROUP : DYN11
FREQUENCY : 50 HZ
INSULATION
HV SIDE KV : L175AC28
LV SIDE KV : L1AC3
HVN KV : L1AC3
CORE AND COIL MASS : 3040 Kg
TANK AND FITTING MASS : 2300 Kg
MASS OF OIL : 1140 Kg
TOTAL MASS : 6500 Kg
TRANSPORT MASS(OIL FILLED) : 5200 Kg
DIAGARM DRG. NO. : A328614
VOLUME OF OIL : 1315 Ltrs
YEAR : 2002
WTICT:
RATIO : 3333 / 175 AMPS
BURDEN : 10 VA
ACC.CLASS : 3
NCT:
RATIO : 4000 / 1 A
ACC. CLASS : PS
Vk : > 500 V
IMAG : < 30 MA AT Vk / 2
RCT@75 : < 14 OHMS
ESP TRANSFORMER–1:
SL.NO. : 0796 – 01 – 03 – 2001
TYPE : ADOR KARONA
KVA : 49.8
AC INPUT VOLTAGE : 415 V
AC INPUT CURRENT : 120 A
AC OUTPUT VOLTAGE : 70731 V
AC OUTPUT CURRENT : 0.700 A
FREQUENCY : 58 HZ
PHASE : SINGLE PHASE
DC VOLTAGE (PEAK) : 95000 V
DC CURRENT : 500 MA
ESP TRANSFORMER-2:
SL.NO. : 0795 – 01 – 03 – 2001
TYPE : ADOR KARONA
KVA : 49.8
AC INPUT VOLTAGE : 415 V
AC INPUT CURRENT : 120 A
AC OUTPUT VOLTAGE : 70731 V
AC OUTPUT CURRENT : 0.700 A
FREQUENCY : 58 HZ
PHASE : SINGLE PHASE
DC VOLTAGE (PEAK) : 95000 V
DC CURRENT : 500 MA
DISEL GENERATOR:
MAKE : CATTERPILLAR
SL.NO. : 9IRGS00058
RATING : 725 KVA
KW : 580
VOLT : 415
HZ : 50
POWER FACTOR : 0.8
R.P.M. : 1500
AMPS : 1009
DIRECTION OF ROTATION : CW
AMBIENT : 40°C
INSULATION CLASS : H
ENCL. TYPE : IP23
YEAR OF MFG. : 2002
SELF REGULATING BRUSHLESS ALTERNATOR:
TYPE : DSG 62M, NR 62 – 237
VOLT : 415
AMPS : 1009 A
CONST. : B24, B16 / B5
DUTY : S1
CAPACITY : 725 KVA
AMP : 40°C
P.F. : 0.8
ROTOR DIRECTION : CW
R.P.M. : 1500
HZ : 50
PHASE : 3
EXCITATION : 35 V
AMPS : 3.7
RIS DEGREE : N
INS. CLASS : H
ENCL. TYPE : IP23
AVR : LC1 / LC2