Parallel Synchronous Generators

In summary, the conversation discusses the three light bulb method for determining if two generators have the same phase sequence. The method states that if all three bulbs get bright and dark together, then the systems have the same phase sequence. The question arises about how the bulbs will light up if the generators have the same phase sequence and equal voltages in each phase. Additional details such as frequency, voltage, and whether the generators are 3 phase or single phase are also mentioned. The conversation also touches upon the concept of phase difference and its effect on current in a resistive circuit. A diagram is provided to help understand a typical 3 phase AC synchronization light connection.
  • #1
scothoward
29
0
Hi,

I am having trouble understanding the three light bulb method for checking whether of not two generators have the same phase sequence. It states in my book, "If all three bulbs get bright and dark together, then the systems have the same phase sequnce."

My question is, if the two generators have the same phase sequence, and the voltages generated in each phase are the same, how will there even be a potential difference across the bulb to allow it to light up?

I am not sure if my question makes sense...Im sure it is just a basic misunderstanding.

Thanks for the help
 
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  • #2
What are the frequency and voltage? 60 Hz, or variable? Low voltage, e.g. 10-20 V or more standard like 110. Are the generators 3 phase, or single phase?

Two line in phase will have a pure sinusoidal voltage. If they are out of phase the max voltages will not coincide, so the current on a purely resistive ciruit will be lesser than if the two lines were in phase.

Think about what happens with V = cos wt + cos (wt+a), and in a three phases system, each phase is 120° or 2pi/3 out of phase with the other two.
 
  • #3
Does this diagram of a typical 3 phase AC synch. light connection help?
 

Attachments

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Related to Parallel Synchronous Generators

1. What is a parallel synchronous generator?

A parallel synchronous generator is a type of electric generator that produces alternating current (AC) with a fixed frequency and voltage. It is designed to operate in parallel with other generators to provide a stable and reliable power supply.

2. How does a parallel synchronous generator work?

A parallel synchronous generator works by converting mechanical energy from a prime mover, such as a steam turbine or diesel engine, into electrical energy. The prime mover rotates the generator shaft, which in turn rotates the rotor inside the generator. The rotor has a set of electromagnets that create a magnetic field, which induces an alternating current in the stator windings.

3. What are the advantages of using parallel synchronous generators?

There are several advantages to using parallel synchronous generators, including:

  • Increased power capacity: By connecting multiple generators in parallel, the overall power capacity can be increased to meet higher demand.
  • Efficiency: Synchronous generators have a high efficiency, meaning they can convert a large amount of mechanical energy into electrical energy.
  • Stable voltage and frequency: Parallel operation of generators helps to maintain a stable voltage and frequency, which is crucial for sensitive electrical equipment.
  • Flexibility: Parallel generators can be easily added or removed from the system, providing flexibility in meeting changing power demands.

4. What is the difference between a synchronous generator and an asynchronous generator?

The main difference between a synchronous generator and an asynchronous generator is in how the rotor is energized. In a synchronous generator, the rotor is energized by a DC current, while in an asynchronous generator, the rotor is not energized and instead relies on electromagnetic induction from the stator to produce power.

5. What are some common applications of parallel synchronous generators?

Parallel synchronous generators are commonly used in power plants, both for main power generation and as backup power sources. They are also used in electrical grids to provide additional power during periods of high demand. Other applications include emergency standby power for hospitals and data centers, as well as in renewable energy systems such as wind turbines and hydroelectric plants.

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