The alternator pitch difference for DG sets synchronizing refers to the difference in rotational speed between two generators that are being connected in parallel. It is an important factor to consider when synchronizing generators to ensure a smooth and efficient transfer of power.
The alternator pitch difference is important because it affects the stability and efficiency of the power system. If the difference is too large, it can cause voltage and frequency fluctuations, which can lead to power outages and damage to the generators.
The alternator pitch difference is measured by comparing the frequency of the generators using a synchroscope or a phase angle meter. The difference is usually expressed in percentage or in degrees of phase angle.
The acceptable range for alternator pitch difference varies depending on the type and size of the generators. Generally, a difference of 0.5% to 2% is considered acceptable for small to medium-sized generators, while larger generators may have a range of 0.2% to 1%.
Alternator pitch difference can be minimized by ensuring that the generators have similar parameters such as frequency, voltage, and phase sequence before attempting to synchronize them. Additionally, using automatic synchronizing equipment and adjusting the governor settings can also help reduce the pitch difference.