SHRI VISHNU ENGINEERING COLLEGE FOR WOMEN:: BHIMAVARAM (AUTONOMOUS) DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
DC MACHINES LABORATORY Course Objective: obtain the characteristics of DC motors and generators by performing brake tests and load tests respectively. Course Outcomes: CO1:. Able to determine the critical field resistance and critical speed of DC Generator CO2: To predetermine the efficiency of a given DC Shunt machine working as Motor and Generator. CO3: Able to obtain performance characteristics of DC Motors and Generators CO4: To determine the efficiencies of DC Series and Shunt generators LIST OF EXPERIMENTS Any ten of the experiments from the following are to be conducted. 1 2
Magnetization characteristics of DC Shunt Generator. Determination of critical field resistance and critical speed Load test on DC Shunt Generator. Determination of Characteristics
3
Load test on DC Series Generator. Determination of Characteristics
4
Load test on DC Compound Generator. Determination of Characteristics
5
Hopkinson’s test on DC Shunts machines. Predetermination of efficiency.
6
Field’s test on DC Series machines. Determination of efficiency.
7
Swinburne’s Test and Predetermination of efficiencies as Generator and Motor
8
Brake Test on DC Compound motor. Determination of performance curves.
9
Brake Test on DC Shunt motor. Determination of Performance curves
10
Separation of losses in DC Shunt motor
11
Speed Control of DC Shunt Motor by Field and Armature control
12
Retardation Test on DC Shunt Machine
List of Equipment with cost S.NO.
1
2
3
4
5
6 7 8 9
10
NAME OF THE EQUIPMENT
DC Shunt Motor coupled Shunt Generator with base plate. Motor: 220V, 5HP, 19A, 1500 RPM. Generator:220V,3KW,13.5A,1500 RPM, Field regulator for motor, Field regulator for generator, 3 point Starter DC Compound Motor coupled DC Compound Generator with base plate. Motor: 220V, 9A,1500 RPM, Generator: 220V, 9KW, 1500RPM, Field regulator for motor, Field regulator for generator, 4 point Starter. DC Compound Motor coupled DC Series Generator with base plate, Motor: 220V, 9A, 1500 RPM, Generator:220V, 2KW, 1500RPM, Field regulator for motor, Field regulator for generator, 4 point Starter DC Series Motor coupled DC Series Generator with base plate, Motor: 220V,9A,1500RPM, Field regulator for motor, Field regulator for generator,2 point Starter DC Shunt Motor coupled Shunt Generator with base plate,Motor:220V,1500RPM, Generator:220V,2KW,1500RPM, Field regulator for motor, Field regulator for generator, 3 point Starter DC Shunt Motor 3HP, 220V, 1500RPM with brake drum arrangement, Field regulator, 3-point Starter. DC Compound Motor 3 HP,220 V,1500 RPM with brake drum arrangement, Field regulator, 4-point Starter DC Series Motor 3 HP, 220 V, 12 A, 1500 RPM with brake drum arrangement, Field regulator, 2-point Starter DC shunt Motor-Shunt Generator panel board with indicating lamps (2.6W,250V) 3 pole MCB, fuses (15A) 3-No. Rectifier from 3 phase, Variable RPM meter (0-2000) RPM, Ammeter (0-2A MC), (0-20A MC) DC Compound Motor-Compound Generator panel board with indicating lamps (2.6W, 250V), 3 pole MCB. Fuses(15A)3-No., Rectifier from 3-phase, Variable RPM meter (0-2000) RPM. Ammeter (0-20A) MC, (0-2A) MC Volt meter (0-300V) MC , (0-30V) MC Field rheostat for motor 200Ω/2A
QUAN TITY
COST
50,679.00 2 37,530.00 1 38,197.00 1 40,750.00 1 38,840.00 1
3
1,47,453.00 24,653.00
1 1
26,800.00 52,000.00
2 25,500.00 1
11
12
13
DC Compound Motor-Series Generator panel board with indicating lamps (2.6W, 250V) 3 pole MCB, Fuses (15A) 3-No. Rectifier from 3 phase, Variable RPM meter (0-2000) RPM. Ammeter (0-20A) MC, Voltmeter (0-300V) MC, Field rheostat for motor 200Ω/2A DC Series Motor-Series Generator panel board with indicating lamps(2.6W,250V) 3 poles MCB, Fuses(15A) 3-No., Rectifier from 3-phase, Variable RPM meter (0-2000) RPM, Ammeter (0-20A) MC, Voltmeter (0-300V) MC, Field rheostat for motor 200Ω/2A
18
DC Shunt Motor-Shunt Generator panel board with indicating lamps (2.6W, 250V) 3 poles MCB, Fuses(15A) 3-No., Rectifier from 3-phase, Variable RPM meter (0-2000) RPM, Ammeter (0-20A) MC, Voltmeter (0-300V) MC, field rheostat for motor 200Ω/2A DC Shunt Motor panel board, 3-point starter, indicating lamps (2.6W,250V), 2poleMCB, Fuses (15A)3-No., RPM meter (02000)RPM, Ammeter(0-20A)MC, (0-2A)MC, Voltmeter(0300V)MC, (0-30V)MC DC Shunt Motor panel board with 3-point starter, indicating lamps (2.6W, 250V), 2 pole MCB, Fuses (15A) 3-No., RPM meter (0-2000)RPM, Ammeter (0-20A)MC, (0-2A)MC, Voltmeter (0-300V)MC,(0-30V)MC DC Compound Motor panel board with 4 point starter and Field regulator, indicating lamps(2.6W,250V) 2 poles MCB, Fuses (15A) 20No. RPM meter (0-2000) RPM, Ammeter(0-20A) MC, (0-2A) MC, Voltmeter (0-300V)MC DC Machines Lab control panel with indicating lamps 4No., Ammeter (MC) (0-100A), (MI) (0-100A), Voltmeter (MI) (0500V) (MI)(0-300V). Frequency meter (45-55) Hz, selector switch-2-No. S.F.U-2-No., 3 pole MCB 15-No., 2 poles MCB 15-No. DC voltmeter (0-300V)
19 20
DC voltmeter (0-50V) DC voltmeter (0-75/150V )
21 22
DC voltmeter (0-75/150/300/600V) (MC) Knife switches SPST DPDT SPDT TPDT TPST
14
15
16
17
Total
25,500.00 1
30,000.00 1
30,000.00 1
28,000.00 2 26,000.00 1 14,000.00 1 14,000.00 1
6
6,210.00
10 12 23
10,800.00 12,600.00
10 10 5 5 3
23,805.00 3,400.00 8,710.00 2,165.00 6,545.00 3,111.00
7,27,248.00
AC MACHINES LAB Course Objective: performance. conduct No–load & Blocked rotor tests and Brake test on three phase Induction motor –phase alternator by synchronous impedance method —phase synchronous machine Course Outcomes: CO1: Able to predetermine the efficiency and regulation of single-phase transformer at given power factors and determine its equivalent circuit. CO2: Able to obtain performance characteristics three-phase Induction motor CO3: To predetermine the regulation of three–phase alternator by synchronous impedance method CO4:To determine Xd and Xq of a salient pole synchronous machine CO5: Able to obtain the V and Inverted V curves of a three—phase synchronous motor SYLLABUS The following experiments are required to be conducted as compulsory experiments: 1. O.C. & S.C. Tests on Single phase Transformer 2. Sumpner’s test on single phase transformers 3. Scott connection of transformers 4. No–load & Blocked rotor tests on three phase Induction motor 5. Regulation of a three –phase alternator by synchronous impedance &m.m.f. Methods 6. V and Inverted V curves of a three—phase synchronous motor. 7. Equivalent Circuit of a single phase induction motor 8. Determination of Xd and Xq of a salient pole synchronous machine In addition to the above eight experiments, at least any two of the following experiments are required to be conducted from the following list: 1. Parallel operation of Single phase Transformers 2. Separation of core losses of a single phase transformer 3. Brake test on three phase Induction Motor 4. Regulation of three–phase alternator by Potier triangle method. 5. Efficiency of a three–phase alternator 6. Heat run test on a bank of 3 Nos. of single phase Delta connected transformers 7. Measurement of sequence impedance of a three–phase alternator.
List of Equipment with cost S.NO .
NAME OF THE EQUIPMENT
1
3-phase Induction Motor squirrel cage type, with brake drum arrangement, star delta starters, A.C, 440V, 50Hz 5 H.P, 8A, 1400 r.p.m.(p) ltd. MAKE: BENN ELECTRICALS 3-phase Induction Motor slip ring type, with brake drum arrangement, Rotor resistance starter. A.C, 440V, 50Hz, 5 H.P, 8A, 1400 r.p.m. MAKE: BENN ELECTRICALS (p) ltd. DC Shunt Motor coupled to Alternator with base plate, Motor: DC, 220V, 5HP, 18A, 1500 r.p.m. Alternator: 3KVA, 400V, 8A, 1500 r.p.m, Field regulator for motor & 3-point starter, static excitation unit. MAKE: BENN ELECTRICALS(P) LTD. DC Shunt Motor coupled to Alternator with base plate, Field regulator for motor, 3-point starter, static excitation unit AC 3Φ, 400V, 50Hz, 8A, 1500 rpm
2
3
4
5
6
7 8 9
10
Synchronous Motor, 3 H.P, 415V, 3Φ, 50Hz, 1500 r.p.m, Synchronous motor frame (rotor wound stator excited) suitable for DOL starter with 4 wires mechanical loading, excitation unit. 1Φ, Induction Motor with brake drum, spring balances, 1H.P, 1Φ, 230V, 1440r.p.m. 50Hz, AC, Induction Motor capacitor start & run motor Pole-changing Inductor Motor with drum arrangement AC-3Φ, 50Hz, 450V, 1.5 KW. DC Compound Motor coupled to a 3Φ Induction Motor, AC, 50Hz, 415V, 5 H.P, 1500 r.p.m. 3-Φ squirrel cage Induction Motor panel board with Y/∆ starter. Indicating lamps-3. 3 pole M.C.B (16A, 600V)-1No. Fuses(10A)-3No., R.P.M. meter (02000 rpm) Ammeters (0-10A) MI-1No., Voltmeter (0-500V) MI-1No., Waltmeter 600V/10A-2No. separates terminals for each component Shunt Motor coupled to Alternator panel board with indicating lamp-1, 3 pole M.C.B. -16A, 600V-1 Fuses(10A)-3, R.P.M. meter (0-2000 rpm) Ammeter (0-20A(MI)-1, Voltmeter 0-500V(MI)-1, Wattmeters 600V/10A-2,Field rheostats for motor-1, Separate terminals for each component.
QUANTITY
COST
23,012.50 1 39,296.30 1 55,557.20 1
56,580.00 1 40,680.00 1 16,190.00 1 1 1
19,930.00 30,740.00 23,000.00
1
25,000.00 1
11
12
13
14
15
16
17
Salient pole Alternator panel board with indicating lamp-1No., Fuses-3 No., MCB-1No., Ammeter-20A, Voltmeter -500V, Ammeter-2A , DC RPM meter separate terminal for each component Transformer indicating lamps-1, 3-pole MCB-16A, 600V-1, Fuses-10A-2, Ammeters(MI) (0-10A)-1 , (05A)-1, Voltmeters (MI) (0-300V)-1, Wattmeters (300V/2.5A)-1, (75V/5A)-1, Separate terminals for each component Scott connected Transformer indicating lamp (2.6W, 250V, AC/DC):-1 No. Synchronous motor indicating lamp (26W,250V AC/DC) 3No., 3 pole MCB (415V, 20A,50Hz) 1No. Fuses (10A)-3 No., RPM meters (0-2000 rpm) -1, Ammeters(0-15A) MI-1, (0-5A) MI- 1 , Voltmeters (0300V) MI -1, Frequency meter (45-55HZ) -1, Wattmeters (300V/5A)- 1, Field rheostat (600Ω/2A)- 1, Separate terminals for each component Changing I.M. indicating lamps -3No., 3 pole MCB1No., RPM meter -1No.(0-2000), Ammeters (0-10A) MI -1, Voltmeters (0-500V) MI-1, Wattmeters (600V/10A) -2, Separate terminals for each component DC Machines control panel with indicating lamps-4 ammeters (mc) (0-100A)-1 (MI) (0-100A)-1 voltmeters (MI) (0-500V)-1 (MC) (0-300V)-1 frequency meters (45-55Hz)-1 selector switches-2 S.F.U-2, 3 pole MCB15, 2 pole MCB-15, CT-1 set, PT-1 set, Busbar-1
32,000.00 1
23,000.00 1
23,000.00 1 22,000.00
1
12,000.00 -32,000.00 1
A.C. Machine control panel indicating lamps-3 Ammeters (MI) (0-100A)-1, Voltmeter (MI) (0-500V)1, Frequency meters (45-55Hz)-1, Selector switches-2 S.F.U-1, 3 pole MCB-12 ,CT-1 set, PT-1 set, Bus bar-1
1
19 20 21 22 23 24 25 26
Ammeters -A.C 0-20A 0-10A 0-5A 0-2A 0-1A Ammeter (0-2.5/5/10A) Voltmeter (0-300V) Voltmeter (0-600V) Voltmeter (0-50V) Voltmeter (0-250V) Voltmeter (0-50V) Voltmeter (0-75/150/300/600V)
2 4 3 4 2 12 1 3 2 3 1 14
2000 .00 4000.00 3000.00 4000.00 2,270.00 12,420.00 1,000.00 3,000.00 2,000.00 3,240.00 1,015.00 14,490.00
27
Wattmeter (75V/5A )
2
3,300.00
18
32,000.00
28
Wattmeter (75/150V,10A )
3
5,197.50
29
Wattmeter (600V,10A)
2
6,900.00
30
Wattmeter (600V,20A)
1
3,450.00
31
Wattmeter (75V/15A/300V/5/10A )
6
11,340.00
32
Wattmeter (150/300/600V, 5/10A)
6
21,384.00
33
Wattmeter(75/150/300,2.5/5A)
5
19,775.00
34
P.F meter (5/10A, 100/300/600V)
1
2,756.00
35
1-Φ Auto transformer 15A, 0-270V
1
3,588.00
36
3-Φ auto transformer 15A, 0-470V
2
20,080.00
37
1-Φ auto transformer 15A, 230V/0-270V
1
3,588.00
38
1-Φ auto transformer 8A, 230V/0-270V
2
4,202.00
39
1-Φ auto transformer 10A, 230V/0-270V
1
2,467.00
40
3-Φ auto transformer 15A, 0-470V
1
12,337.00
41
Transformer 1-Φ 230V/115V, 2KVA
2
12,824.40
42
Transformer 1-Φ 230V/115V, 1KVA
2
7,529.80
43
Transformer 1-Φ 230V/115V, 2KVA
2
16,400.00
44
Scott transformer with scott tapping at 50% & 89.69% on HV side 3.5% regulation 1 KVA 230V/115V
2
45
Transformer 1KVA 230V/115V
1
5,500.00
46
STEP down transformer 1-Φ , 2 K.V.A
2
13,000.00
47
Digital tachometers
3
5,940.00
48
Frequency meter indication read type
1
1,741.00
49
Frequency meter vibrating type read type
1
1,741.00
50
Synchroscope
1
3,753.00
51
Phase sequence meter
1
523.00
Total
9,800.00
757537.00
