【 The power supply of the generator set must be interlocked with the power supply of the external power supply circuit, and parallel operation is strictly prohibited. ] What does this mean? Why?

This is a very common dual power supply control in factories. The generator set in the factory is not allowed to run in parallel with the grid power supply. Even if there is a grid synchronization device, it is not allowed without the permission of the grid. Interlocking means that only one power supply is allowed to be closed under any circumstances. Generally speaking, priority is given to the use of urban power supply. When the commercial power is cut off, the generator set automatically starts and turns on the power supply, and disconnects the electrical connection with the external power grid. When the external power grid calls, disconnect the power supply of the generator set, restore the power supply of the external power grid, and stop the generator. This control mode is electrical interlocking.