What are the conditions for the parallel operation of the two generators? What devices are used to complete the parallel operation?

The condition of parallel use is that the voltage, frequency and phase of the two machines are the same. Commonly known as "three simultaneous". With a special parallel device to complete the parallel work. It is recommended to use a fully automatic joint cabinet without manually parallel the machine. Because the success of manual parallel depends on human experience. The reliable success rate of manual parallel operation of diesel generators is almost zero. The small power supply system can not be applied to the concept of manual parallel power supply system, because the protection level of the two is completely different.