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The star connection, frequently employed in electrical systems, offers several advantages:
1. Voltage Adaptability: In a star connection, the phase voltage is lower than the line voltage (it is (frac{1}{sqrt{3}}) times the line voltage), making it suitable for applications that require different voltage levels. This adaptability can be particularly advantageous in systems that need both high voltage (for power transmission) and low voltage (for domestic or commercial use).
2. Safety: Since each phase of a star-connected system is connected to a common neutral point, the phase voltage is lower relative to earth than in a delta connection. This aspect makes star connections safer for end-use equipment, reducing the risk of electrical hazards.
3. Isolation of Faults: In the event of a fault in one phase, a star connection helps in isolating the problem, preventing it from affecting the entire system. This isolation can lead to fewer disruptions and easier fault detection and repair.
4. Economical for Long Distance: The star connection is generally more economical for distributing power over long distances. The ability to have different voltages available from the same system reduces the need for separate transformers, saving costs.
5. Simple to Ground: A star-connected system can be easily grounded at the neutral point, enhancing the overall stability and safety of the system by providing a path for fault currents to earth.
6. Efficient Use of Conductors: By allowing the use of four
Answer: c
Explanation: The hydro-generators stator windings are connected in the star connected with the neutral earthed. It eliminates the triple frequency harmonics from the line voltage.