Mixed

What is a bus bar in synchronous motor?

What is a bus bar in synchronous motor?

Infinite bus bar is one which keeps constant voltage and frequency although load varies. The Fig. 1 shows a synchronous machine which is to be connected to the bus bars with the help of switch K. If the synchronous machine is running as a generator then its phase sequence should be some as that of bus bars.

What is slip in synchronous motor?

Slip is the difference between the synchronous speed of a motor and its actual speed. Mathematically it is determined by. Slip = Synchronous Speed − Actual Speed. Using the example above for synchronous speed of a motor with four poles operating at 60 hertz, the value was calculated to be 1800 RPM.

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What is infinite bus for in synchronous machine?

An infinite bus is a power system so large that its voltage and frequency remain constant regardless of how much real power and reactive power is drawn from or supplied to it. When an alternator is operating in parallel with an infinite bus and its excitation voltage is changed, the power factor of the machine changes.

What are the conditions to get the generator synchronized to an infinite bus?

Thus, synchronizing requires the following conditions of the incoming generator:

  • Correct phase sequence and waveform.
  • Frequency almost exactly equal to that of the system.
  • Zero phase angle.
  • Machine terminal voltage approximately equal to the system voltage.
  • Phase voltages in phase with those of the system.

When alternator is connected to infinite bus bar change in excitation for alternator will?

When alternator is connected to infinite bus bar, change in excitation for alternator will change terminal voltage & power factor.

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What is infinitiinfinite bus bar?

Infinite bus bar is one which keeps constant voltage and frequency although load varies. The Fig. 1 shows a synchronous machine which is to be connected to the bus bars with the help of switch K. If the synchronous machine is running as a generator then its phase sequence should be some as that of bus bars.

How to connect a synchronous machine to bus bars?

The Fig. 1 shows a synchronous machine which is to be connected to the bus bars with the help of switch K. If the synchronous machine is running as a generator then its phase sequence should be some as that of bus bars. The machine speed and field current is adjusted in such a way so as to have the machine voltage same as that of bus bar voltage.

What happens when switch K is closed in a synchronous motor?

Once switch K is closed, the stator and rotor fields of the machine lock into each other and the machine then runs at synchronous speed. The real power exchange with the mains will be now governed by the loading conditions on the shaft while the reactive power exchange will be determined by field excitation.

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Why does a bus-bar motor have a retarding torque?

A tendency of E to advance in time would tend to make it supply power to the bus-bars and thereby experiencing a retarding torque. A tendency for E to delay in time would tend to convert it into a synchronous motor, and it would be driven by energy drawn from the bus-bars.