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Questions and Answers
What should be done to the power supply voltage control (variac) before turning on the power supply?
What is the purpose of connecting the tachogenerator to the alternator shaft?
Which instrument is used to measure and record E12, E23, and E31 with zero excitation (If = 0A)?
What is the initial DC excitation current value in step 7 before gradually increasing it to 0.05A?
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What action should be taken after measuring and recording the generated voltages E12, E23, and E31 for a specific DC current in step 7?
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Which connection requires a variable dc supply from terminals 7 and N in this setup?
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Study Notes
Power Supply Voltage Control
- Adjust the variac to its minimum setting before powering on the power supply to prevent damage.
- This precaution ensures a smooth startup and avoids inrush current caused by sudden voltage surges.
Tachogenerator and Alternator Shaft
- The tachogenerator is connected to the alternator shaft to measure the rotational speed of the alternator.
- Accurate speed measurement is crucial for maintaining optimal performance and synchronizing output voltage.
Instrumentation for Voltage Measurements
- A precise voltmeter is used to measure and record the voltages E12, E23, and E31 with zero excitation (If = 0A).
- This measurement is essential for baseline comparisons and understanding the system's behavior before applying any excitation.
Initial DC Excitation Current
- The initial DC excitation current value in step 7 is set to 0A before incrementally increasing it to 0.05A.
- Starting at 0A allows for a controlled application of voltage and minimizes risks associated with sudden changes.
Post-Measurement Actions
- After measuring and recording the generated voltages E12, E23, and E31 for a specified DC current in step 7, all data should be documented for analysis.
- This enables correlation between excitation levels and generated voltage outputs, aiding in system evaluation and adjustments.
Variable DC Supply Connection
- A variable DC supply is required from terminals 7 and N to facilitate control of the excitation current.
- This configuration allows for precise adjustments to the excitation based on operational needs and test conditions.
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Description
Learn the step-by-step procedure for mechanically coupling a three-phase induction motor and synchronous generator. Follow instructions to connect different components like tachogenerator, tachometer, ammeters, and power supply according to the provided diagram.
