Electrical Engineering Equipments

Objective: To obtain external characteristics of a dc shunt generator

Preview:The self excited DC shunt Generator is coupled to a DC motor, which acts as prime mover. Two characteristics are more important. The internal or total characteristic that gives the relation between the emf actually induced in the armature and the armature current. This is of interest mainly to the designer. The external characteristics called performance characteristics (also voltage regulating curve) which give the relation between the terminal voltage and load current. This curve lies below the internal characteristics due to armature drop. This is important in judging the suitability of a generator for a particular purpose. These characteristics can be obtained by a load test with total field resistance remaining fixed as the speed is to be kept constant.

Equipment Required: All the measuring instruments associated with each experiment are industrial grade. These instruments are housed in an elegant cabinet as a package. Range of instruments and accessories (standard format)

• 2HP Shunt machines mechanically coupled both are identical 220V 2HP 1500rpm.
• 3-4 point DC Starter for the above
• Suitable Loading rheostats
• Digital tachometer
• Suitable double tube rheostat
• Suitable single tube rheostat
• Suitable digital Voltmeters DC
• Suitable DC source –Rectifier unit.

This is an AC 3 induction motor. This operates on 415V AC. This squirrel cage induction motor coupled to a 2KW shunt generator.

Specifications:

• Volts: 415V - 3¢
• Power: 2.2KW
• Current : 4.8A
• RPM: 1440
• Frame: PM100.

Single phase double wound copper transformer having primary 230VAC and secondary 115V AC with a rated capacity of 1KVA. The primary and secondary terminals are brought out for conducting laboratory experiment with legend printed for convenience. This is assembled in a powder coated MS metal box.

Specifications:

• Primary : 230 V AC
• Secondary with tappings at 86.6% and at 50% of primary voltage.
• Rated capacity: 1KVA
• Terminations: Separate 4mm Banana terminals at input and outputs
• Enclosure: Powder coated MS metal cabinet, with separate screw terminal for earth connection. 

This is an AC 3 synchronous alternator with, square path, 4 poles, and rotor wound stator excited type. This is screen protected IP22, with drip proof enclosure.

Specifications:

• Voltage: 415V
• Amps: 4.2A
• RPM: 1500
• KVA-3
• Rating-CMR
• Phases-3,Hz-50
• ENCL-S.P,PF-0.8
• Extn VOLTS-220
• Winding-Y
• Amps-1.4A.

1. Outer yoke made up of High grade cast iron MS Frame

2. High grade silicon stamping Stator with hydraulically pressed

3. Suitable copper conductor of best quality used for winding for both Stator and Rotor4. Skewed Rotor construction with dynamically balance ensuring low noise

5. Larger size of bearings for longer life and trouble free operations

6. Vacuum pressure impregnation for stator & rotor ensuring high insulation strength

7. Rotor and brake drum Pulley are Dynamically Balanced8. Gun Metal Slip rings with good quality carbon brushes are used

9. All the terminals on terminals Box are properly engraved

10. Sturdy base frame with heavy duty bolt and also highly accurate dial type spring balance to give proper readings of the machines.  All Slip Ring Induction Motors Confirming to ISS

11. Ratings: For 3ph, 415Volts, 50Hz. 2H.P to 7.5HP

12. Starting Methods: Rotor Resistance Starter with no volt and over load protection.    

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• Optimum performance 

2. High grade silicon stamping Stator with hydraulically pressed.

3. Dynamically balance dies casted Rotor of High grade Aluminum used.

4. Larger size of bearings for longer life and trouble free operations.

5. Vacuum pressure impregnation for stator - ensuring high insulation strength.

6. All the terminals on terminals Box are properly engraved.

7. Brake drum pulley are Dynamically Balanced.

8. Sturdy base frame with heavy duty bolt with CP handle and also highly accurate dial type  spring balance to give proper readings of the machines.

9. Ratings: For 3ph, 415Volts, 50Hz.

 0.5H.P to 15HP.10.  Ratings: for 1ph 220V, 50Hz.                  

capacitor Start / Run Motor 0.5H.P to 2 HP.

Open Circuit Test

Objective: To obtain the magnetization characteristic and therefore determine the critical field resistance and critical speed of the given dc shunt generator.

Preview: The EMF induced in a DC machine is proportional to the flux per pole, the number of conductors and speed. This EMF depends on speed and flux. As the flux increases the EMF increases beyond a point the flux gets saturated. The BH curve of the core depicts the magnetization curve of the machine.

(A) Critical Speed of a DC Shunt Generator

Objective: To determine the critical speed of a dc shunt generator. With the fixed excitation and variable speed, as the speed reduces the OCC proportionally slides down so that the no load voltage reduces. At a particular speed, called the critical speed, the OCC is tangential to the Rf line and as a result the generator fails to excite.

Preview: With the fixed excitation and variable speed, as the speed reduces the OCC proportionally slides down so that the no load voltage reduces. At a particular speed, called the critical speed, the OCC is tangential to the Rf line and as a result the generator fails to excite.

Equipment Required: All the measuring instruments associated with each experiment are industrial grade. These instruments are housed in an elegant cabinet as a package. Range of instruments and accessories (standard format)

1. 2HP Shunt machines mechanically coupled both are identical 220V 2HP 1500rpm.
2. 3-4 point DC Starter for the above
3. Suitable Loading rheostat
4. Digital tachometer
5. Suitable Double tube rheostat
6. Suitable Single tube rheostat
7. Suitable Digital Voltmeter DC
8. Suitable Digital Voltmeter DC
9. Suitable Digital Ammeter DC
10. Rectifier Unit 0-240V DC @ 1.5KVA with power failure protection.