Open Circuit Test Objective:;To acquire the charge trademark and in this manner decide the basic field obstruction and basic speed of the given dc shunt generator. Review: The EMF actuated in a DC machine is corresponding to the motion per shaft, the quantity of conductors and speed. This EMF relies upon speed and transition. As the motion expands the EMF increments past a point the motion gets immersed. The BH bend of the center portrays the polarization bend of the machine. (A) Critical Speed of a DC Shunt Generator Objective:;To decide the basic speed of a dc shunt generator. With the settled excitation and variable speed, as the speed diminishes the OCC relatively slides down so the no heap voltage decreases. At a specific speed, called the basic speed, the OCC is extraneous to the Rf line and subsequently the generator neglects to energize. Review: With the settled excitation and variable speed, as the speed decreases the OCC relatively slides down so the no heap voltage diminishes. At a specific speed, called the basic speed, the OCC is extraneous to the Rf line and accordingly the generator neglects to energize. ; Equipment Required:;All the estimating instruments related with each test are mechanical review. These instruments are housed in a rich bureau as a bundle. Scope of instruments and embellishments (standard arrangement) 1. 2HP Shunt machines mechanically coupled both are indistinguishable 220V 2HP 1500rpm. 2. 3-4 point DC Starter for the over 3. Reasonable Loading rheostat 4. Computerized tachometer 5. Appropriate Double tube rheostat 6. Reasonable Single tube rheostat 7. Reasonable Digital Voltmeter DC 8. Reasonable Digital Voltmeter DC 9. Appropriate Digital Ammeter DC 10. Rectifier Unit 0-240V DC @ 1.5KVA with control disappointment insurance..
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