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Power electronics lab file, Lab Reports of Power Electronics

Thapar Institute of Engineering and TechnologyPower Electronics

Power electronics lab file with procedure

Typology: Lab Reports

2020/2021

Uploaded on 06/08/2021

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SUBMISSION BY Srishti Mittal 101805029 3EIC2 to Dr Ankit Kumar
Experiment 1 : Control Characteristics of Silicon Controlled Rectifier (SCR).
Objective: To study and experimentally verify:
(1)Control characteristics of SCR (2) V-I characteristics of SCR
Apparatus: SCR Characteristics Trainer kit
Procedure for Control Characteristics:
1. Connect the experimental set up as shown in the circuit diagram.
2. Adjust Anode- Cathode voltage (VAK) to the value of 20V by varying Pot VAK.
3. Increase gate current by varying the Pot IG and note the value of gate current at which anode
current increases suddenly. This is the value of triggering current for the fixed VAK.
4. To turn off the SCR, minimise the gate current and press the push button.
5. Repeat the above steps for other values of VAK and note down the corresponding values of IG.
Procedure for V-I Characteristics:
1. Repeat the above steps 1&2 to make the SCR to conduct.
2. Keeping the SCR in conducting state, fix the gate current IG to 6.0 mA.
3. Vary the value VAK in steps and note down the corresponding value of anode current.IAK..
4. Repeat step3 by fixing the gate current to some other value, say 6.5 mA.
Observation Table:
Control Characteristic
SrNo. Vak Ig
1. 20 3
2. 40 2.2
3. 60 2.6
4. 80 2.4
5. 100 2.2
V-I Characteristics
S No. Ig Vak Iak
1.
IG1
6
mA
4
2.
6
10
3. 6 30 15
4. 6 40 20
5. 6 50 26
6. 6 60 30.5
IG2
1. 8 mA 10 4
2. 8 20 10
pf3
pf4
pf5
pf8
pf9
pfa
pfd

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SUBMISSION BY Srishti Mittal 101805029 3EIC2 to Dr Ankit Kumar

Experiment 1 : Control Characteristics of Silicon Controlled Rectifier (SCR). Objective: To study and experimentally verify: (1)Control characteristics of SCR (2) V-I characteristics of SCR Apparatus: SCR Characteristics Trainer kit Procedure for Control Characteristics:

  1. Connect the experimental set up as shown in the circuit diagram.
  2. Adjust Anode- Cathode voltage (VAK) to the value of 20V by varying Pot VAK.
  3. Increase gate current by varying the Pot IG and note the value of gate current at which anode current increases suddenly. This is the value of triggering current for the fixed VAK.
  4. To turn off the SCR, minimise the gate current and press the push button.
  5. Repeat the above steps for other values of VAK and note down the corresponding values of IG. Procedure for V-I Characteristics:
  6. Repeat the above steps 1&2 to make the SCR to conduct.
  7. Keeping the SCR in conducting state, fix the gate current IG to 6.0 mA.
  8. Vary the value VAK in steps and note down the corresponding value of anode current.IAK..
  9. Repeat step3 by fixing the gate current to some other value, say 6.5 mA. Observation Table: Control Characteristic SrNo. Vak Ig
    1. 20 3
    2. 40 2.
    3. 60 2.
    4. 80 2.
    5. 100 2. V-I Characteristics S No. Ig Vak Iak
    6. IG1 6 mA 10 4
    7. 6 20 10
    8. 6 30 15
    9. 6 40 20
    10. 6 50 26
    11. 6 60 30. IG
    12. 8 mA 10 4
    13. 8 20 10

Transfer Characteristics:

Experiment 3: Control Characteristics of MOSFET. Objective: To study and experimentally verify: (1) Transfer characteristics (2) Output characteristics Apparatus: MOSFET Trainer kit Procedure for Transfer Characteristics;

  1. Connect the experimental set up as shown in the circuit diagram.
  2. Adjust Drain-Source voltage (VDS) at some particular value by varying Pot VDS.
  3. Increase the Gate-Source voltage (VGS) by varying the Pot VGS till the MOSFET gets turned on.
  4. Record the values of Gate-Source voltage (VGS) and corresponding values of Drain current (ID).
  5. Repeat the above steps for some other value of Gate-Source voltage (VGS) Observation Table: Output Characteristics: S No. VDS VGS ID
    1. VDS1 4 0.5 0.
    2. 4 1 0.
    3. 4 1.5 0.
    4. 4 2 0.
    5. 4 2.5 0.
    6. 4 3 0.
    7. 4 3.5 0.
    8. 4 4 1
    9. 4 4 .5 1.
    10. 4 5 1.
    11. 4 5.5 1.
    12. 4 6 1.
    13. 4 6. 5 1.
    14. 4 7 1.
    15. 4 7.5 1. Transfer Characteristics: S No. VGS 1 VDS ID
    16. 5 0.4 0.
    17. 5 0.8 0.
    18. 5 1.2 0.
    19. 5 1.6 0.
    20. 5 2.0 1
    21. 5 2.4 1.
    22. 5 2.8 1.
    23. 5 3.2 1.
    24. 5 3.6 1.
    25. 5 4 1.
    26. 5 4.4 1.

Experiment 4: Study of R, RC & UJT firing circuits Objective : To study the operation of R, RC and UJT firing circuits. Apparatus : (1) R, RC & UJT firing module (2) C.R.O. (3) Digital multi-meter (4) Rheostat Procedure:

  1. Make the connections as shown in the corresponding figure.
  2. Apply the firing pulse from the corresponding firing circuit.
  3. Switch on the Power and 24V AC supply on the Trainer Kit.
  4. Study the wave from for various firing angles by varying the Firing Pot.
  5. Measure the average DC voltage across load and R.M.S value of AC input voltage.
  6. Calculate DC output voltage using the equation and compare it with the measured value.
  7. Repeat the above procedure for RC firing circuit and UJT firing circuit. Observation Table: Resistance firing circuit: SrNo. Firing Angle Output Voltage
    1. 0 10.
    2. 18 10.
    3. 36 9.
    4. 54 8.
    5. 72 6.
    6. 90 5. 8
    7. Above 90 0 R-C firing Circuit: SrNo. Firing Angle Output Voltage
    8. 0 10.
    9. 108 4.

Experiment 5: Single phase AC to DC Power Converter (Half Controlled) Objective: To experimentally verify the operation of single phase half controlled Converter with different types of loads. Apparatus: (1) Experimental kit (2) Load Resistor (3) C.R.O. (4) DC Motor Procedure:

  1. Connect the experimental setup as shown in the figure.
  2. Perform this experiment with resistive load first.
  3. Apply the firing circuit of two SCRs in proper synchronization with AC mains.
  4. Adjust the AC input voltage to get the rated DC output voltage of about 220V.
  5. Now keeping the AC input voltage fixed, vary the firing angle from 0 to 180 degrees and note down variations in average output voltage and load current.
  6. Repeat this process for DC motor load. Observation Table: Resistive Load: S. No. Firing Angle Average Output (v) Load current(A)
  7. 0 149.2 0.
  8. 18 144 0.
  9. 36 130 0.
  10. 54 110 0.
  11. 72 83 0.
  12. 90 60 0.
  13. 108 36 0.

Experiment 7: Three Phase half controlled Converter to control DC Drive. Apparatus Required: Sr. No. Apparatus Specification

  1. Three phase Bridge Converter Kit Half controlled
  2. Three phase Firing circuit Three phase
  3. C.R.O Normal
  4. D.C Shunt Motor .37 kW, 230 V
  5. Tachometer Contact Type Procedure:  Connect 3 phase bridge converter to the 3-phase bridge firing circuit to apply firing pulses.  Connect R, Y and B phases of firing circuit and converter circuit to the variac.  Join armature and field terminals of the DC motor with converter circuit.  Connect C.R.O to the output of the half wave converter circuit.  Give 400V AC supply to the converter circuit through 3-phase variac.  Fix the 3 Phase input to about 200V and vary the firing angle in steps and note down the corresponding value of DC output voltage. Observation table: S. No. Firing Angle Average output Load current
  6. 0 210 0.7 A
  7. 6.6 207 0.
  8. 13.2 205 0.
  9. 19.8 202 0.
  10. 26.4 196 0.
  11. 33 189 0.

Experiment 8: Three Phase fully controlled converter to control DC Drive. Apparatus Required: Sr. No. Apparatus Specification

  1. Three phase Bridge Converter Kit Fully controlled
  2. Three phase Firing circuit Three phase
  3. C.R.O Normal
  4. D.C Shunt Motor .37 kW, 230 V
  5. Tachometer Contact Type Procedure:
  6. First connect three-phase bridge converter circuit to the three-phase bridge firing circuit to give the firing pulses at different angles.
  7. Connect R,Y and B phases of firing circuit and converter circuit with the variac.
  8. Join armature and field terminals of the DC motor with the converter circuit.
  9. Connect CRO to the o/p of the full wave converter.
  10. Observe the waveforms in CRO by varying firing angle of the SCRs. Observation Table: Sr. No. Firing Angle Average output Speed(rpm)
  11. 2 204 1436
  12. 6.7 200 1416
  13. 13.4 194 1384
  14. 20.1 185 1330

Experiment-10: SPIM - Single phase Induction Motor variable speed Drive. Apparatus Required: S.NO Apparatus Specification

  1. SPIM Trainer Kit Trainer Module
  2. Induction Motor 0.37 KW ,230V
  3. AC voltmeter 0-300v
  4. C.R.O Double Beam
  5. Tachometer Digital Procedure:
  6. Put a shorting link between “DIR &CW” on the panel.
  7. Check the availability of four drive signals with respect to ref. point.
  8. Connect the four links associated with the drive signals.
  9. Connect the motor load, C.R.O and AC Volt meter across the output terminals.
  10. Now switch on the unit and observe the soft-start action and speed variations.
  11. Vary the speed and note down the parameters in the observation table. Observation table: S. NO Output Voltage Speed Output frequency
  12. 60 1580 26.
  13. 59 1570 26.
  14. 61 1600 28.
  15. 61 1800 30.
  16. 61 1900 32.
  17. 62 1990 34.