A synchronising diesel generator is a system where multiple generators are connected and operated together in synchronisation to share the electrical load. Synchronisation ensures that the voltage, frequency, and phase of each generator match before connecting them to a common electrical bus or grid. This is crucial to prevent electrical imbalances, which could lead to damage or inefficiencies.

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In the context of diesel generators, synchronisation is often achieved through control systems that monitor and adjust the speed, voltage, and phase of each generator. This allows multiple generators to work in harmony, providing a more stable and reliable power supply. Synchronised diesel generators are commonly used in situations where the power demand is variable or in parallel operation with a utility grid.