1. System Construction

• Panel Type: Sturdy flat panel system with an aluminum profile (tabletop design).

• Component Housing: High-voltage components are housed in plastic enclosures to minimize the risk of electrical shock.

2. Input 3-Phase DOL Starter Panel

• MCB: 4-pole MCB, 415V/4A

• Contactor: DOL 9A Contactor with 230V, 50Hz, 11VA coil

• Overload Relay: Bimetallic thermal overload relay with a range of 1.4A to 2.3A

3. Integrated AC 3-Phase Multifunction Measurement Panel

• Measurement Type: Bidirectional multifunction

• CT Input: 3-phase, ¾ wire, 415V, CT input 5A

• Display: LCD/LED display

• Auxiliary Supply: 230V, 45-65Hz, 5W

• Measured Parameters: Voltage (V), Current (I), Frequency (Hz), Power Factor (Pf), KVA, KW, KWH

4. Star-Delta Starter Panel

• Switch Type:

  • FWD/REV, 3-pole, 3-way switch with center OFF, rated 6A/440V

  • Star/Delta, 3-pole, 3-way switch with center OFF, rated 6A/440V

5. 3-Phase Wound Rotor & Synchronous Motor Panel

• Rotor Resistors:

  • 30Ω/5A, with 3 taps (0Ω, 15Ω, 21Ω, 30Ω), 3 resistors provided

• Rotor Resistor Selector Switch: 3-pole, 6-way, rated 6A/440V

• DC Rotor Excitation Relay: Overcurrent relay, 3A

6. DC Voltmeter & DC Ammeter Panel

• DC Voltmeter: Measurement range 0-300V

• DC Ammeter: Measurement range 0-5A, with polarity protection diode

7. SCR Actuator (Variable DC) and Sensor Signal Conditioning Panel

• SCR Actuator: Full bridge SCR-based system, 0V-195V, 3A cosine firing with linear characteristics

• Signal Conditioning: Supports circuit for speed and torque measurement in kg wt, with output range 0-2.5V DC (Full Scale)

8. Instrumentation Power Supply and Multichannel Digital Meter Panel

• Power Supply:

  • +/-12V, 500mA

  • +5V, 300mA

  • Unregulated 17V DC/750mA

  • Line synchronizing signal

  • 13V, 3A

• Digital Display: Multi-channel display of torque, speed, and other parameters

Motor Specifications

• Motor Type: 3-phase AC integrated motor

• Voltage: 415VAC, 50Hz

• Capacity: 5HP, 4-pole, 1500RPM

• Rotor Construction: Star-connected with four terminals including the star point, brought out on 4 slip rings mounted on the shaft

• Stator Construction: Six terminals for starting the motor using the star-delta starter

• Frame/ Mounting: 100 frame, chassis-mounted, 19mm shaft diameter

• Loading Arrangement: Friction brake pulley (60.5mm diameter) with a 20kg spring balance for torque measurement

• Speed Measurement: Hand-held tachometer

List of Experiments

1. Speed-torque characteristics of a 3-phase wound rotor induction motor with variable rotor resistance.

2. Efficiency and input power factor measurement of a 3-phase wound rotor induction motor.

3. Speed-torque characteristics of a 3-phase short-circuited rotor induction motor.

4. Efficiency and input power factor measurement of a 3-phase short-circuited rotor induction motor.

5. Speed-torque characteristics of a 3-phase synchronous motor.

6. Efficiency and input power factor measurement of a 3-phase synchronous motor.

7. Use of a synchronous motor as a power factor improvement device; study of ‘V’ curves.

8. Study of Direct-On-Line (DOL) starter for a 3-phase induction motor.

9. Study of the star-delta starter for a 3-phase induction motor.

10. Study of rotor resistance starter for a 3-phase wound rotor induction motor.

11. Study of direction reversal for a 3-phase induction motor.