Synchroscope – Circuit Diagram, Working, Applications | New Topic [2024]

In this note, we are going to know about Synchroscope and also about its Circuit Diagram, Working Principle, and Applications as well. Welcome to Poly Notes Hub, a leading destination for engineering notes for diploma and degree engineering students.

Author Name: Arun Paul.

What is Synchroscope?

A synchroscope is a device that measures the degree and direction of phase synchronization between two AC power sources. It is generally used in power systems to synchronize generators or alternators to the grid. Its primary role is to align the frequency and phase angle of the entering generator with the grid prior to connecting.

Synchroscope Diagram

Below is a simplified explanation of a typical synchroscope circuit –

1. Two-phase connections are coming from the incoming generator and the existing bus which is the main power source.
2. Two coils are arranged orthogonally, which will produce the rotating magnetic field.
3. The Rotor and pointer, are used here to indicate the phase difference.

Synchroscope Working

This device operates on the principle of electromagnetic induction and is made up of a tiny motor with two coils, one of which is connected to either the generator or the bus bar. The phase difference between the two sources causes a spinning magnetic field, which propels the synchroscope’s pointer in one direction or another depending on the relative phase and frequency.

• Operation:
  • When the generator and busbar frequencies are equivalent but not in phase, the phase difference between them produces a revolving magnetic field.
  • This field causes the rotor, and hence the pointer, to revolve.
  • The direction of rotation of the pointer indicates whether the incoming generator is quicker or slower than the bus bar.
  • When the generator and bus frequencies match and are in phase, the pointer stops at the zero or “in-phase” position, signaling that the generator can now be connected to the bus.
• How to Read Synchroscope?
  • If the pointer turns clockwise, the generator outperforms the bus.
  • If the pointer goes anticlockwise, the generator slows down.
  • The ideal circumstance is for the pointer to remain at the “12 o’clock” position, signifying perfect synchronization.

Application of Synchroscope

• Synchronize generators with the grid to provide smooth power flow and prevent destructive failures caused by phase mismatch.
• Synchroscopes are useful in enterprises with several generators or backup generators because they help synchronize extra power sources with the main power supply during peak demand periods or maintenance schedules.
• Used in ships and aircraft with many generators to synchronise power systems, ensuring efficient load sharing and minimizing phase mismatches.