Podcast
Questions and Answers
What is the primary function of the two parallel windings within the armature of a synchroscope?
What is the primary function of the two parallel windings within the armature of a synchroscope?
- To dampen oscillations in the rotor's movement.
- To create a rotating magnetic field through phase shifting. (correct)
- To provide redundant power sources for increased reliability.
- To regulate the voltage levels of incoming power.
In a synchroscope, what does the anti-clockwise rotation of the rotor signify regarding the incoming machine?
In a synchroscope, what does the anti-clockwise rotation of the rotor signify regarding the incoming machine?
- The incoming machine is operating at a higher voltage.
- The frequency of the incoming machine is less than that of the bus. (correct)
- The incoming machine is about to experience a fault.
- The incoming machine's phases are not correctly aligned with the bus.
Why is it important to issue the command to close the incoming alternator breaker when the synchroscope pointer is near the one o'clock position during synchronization?
Why is it important to issue the command to close the incoming alternator breaker when the synchroscope pointer is near the one o'clock position during synchronization?
- To minimize the risk of damage from over-voltage.
- To provide an opportunity for final adjustments to the alternator's output.
- To ensure the most stable electrical connection.
- To allow for the breaker's closing time so that the alternator connects around the two o'clock position. (correct)
What principle is utilized by a synchroscope to determine when two AC sources are synchronized?
What principle is utilized by a synchroscope to determine when two AC sources are synchronized?
How does the inclusion of both resistance and inductance in the armature windings contribute to the synchroscope's operation?
How does the inclusion of both resistance and inductance in the armature windings contribute to the synchroscope's operation?
Flashcards
Synchroscope
Synchroscope
A device using AC motor principles to indicate the phase relationship between two AC sources.
Synchroscope Connections
Synchroscope Connections
Incoming machine phases connect to synchroscope ports, and switchboard bus phases power armature windings.
Rotating Magnetic Field
Rotating Magnetic Field
Resistance and inductance in parallel armature windings create a rotating magnetic field.
Anti-Clockwise Rotation
Anti-Clockwise Rotation
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Close Breaker Command
Close Breaker Command
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Study Notes
Synchroscope Functionality
- Synchroscope operation relies on AC motor principles.
- It has two ports which are connected across two phases (e.g., red and yellow) of the incoming machine.
- Armature windings receive power from similar phases (red and yellow) in the switchboard bus.
- The armature has two parallel windings.
- One half-winding includes a resistance in series.
- The other half-winding includes an inductance in series.
- The inductance shifts current flow through it by 90 degrees relative to the current in the resistance.
- The currents in the two armature windings create a rotating magnetic field.
- This rotating field interacts with alternating north-south polarity of the poles, based on changes in the incoming machine's phases.
- The rotor rotates clockwise or anti-clockwise depending on the interaction between rotating field and poles.
- The rotation direction indicates the speed/frequency of the incoming machine.
- Anti-clockwise rotation signifies that the frequency of the incoming machine is less.
- Clockwise rotation signifies that the frequency of the incoming machine is more.
- The command to close the incoming alternator breaker is given at about the one o'clock position when the pointer rotates clockwise.
- The command to close the incoming alternator breaker is also given at about the one o'clock position when the pointer rotates anti-clockwise.
- This ensures the machine connects to the bus bars when the pointer reaches the two o'clock position.
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Description
This resource explains how a synchroscope operates using AC motor principles. It details the connections to incoming machine phases and switchboard bus phases. The explanation includes the roles of resistance and inductance in shifting current, creating a rotating magnetic field, and indicating the speed/frequency of the incoming machine.
