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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)
1. 2HP Shunt machines mechanically coupled both are identical 220V 2HP 1500rpm.2. 3-4 point DC Starter for the above3. Suitable Loading rheostats4. Digital tachometer5. Suitable double tube rheostat6. Suitable single tube rheostat7. Suitable digital Voltmeters DC8. Suitable digital ammeters DC.9. Suitable DC source Rectifier unit
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 above3. Suitable Loading rheostat4. Digital tachometer5. Suitable Double tube rheostat6. Suitable Single tube rheostat7. Suitable Digital Voltmeter DC8. Suitable Digital Voltmeter DC9. Suitable Digital Ammeter DC10. Rectifier Unit 0-240V DC @ 1.5KVA with power failure protection.
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:
