If you try to connect the generator output to the utility, there may be serious damage to the generator. When you tie the generator in parallel with the utility the utility will instantly try make the phase angle of the generator match that of the utility. If the phase angle between the 2 sources is not within about 5 degrees, the utility power will try to make the generator mechanically match the utility phase angle instantaneously. This will result in as a minimum of a tripped breaker, but may actually cause the generator shaft to break. When generators are run in parallel with a utility source or other generators, special paralleling equipment is used to match the phase angle before closing the parallel switch. I am not talking about phase rotation here, but rather the actual point on the sine wave where the two sources are when they are tied together. It goes without saying that the phase rotation and voltage must be matched in addition to the phase angle. All most all utilities require reverse power switching in any generator that operates in parallel with them. This is to prevent back feeding their system. Most of the time it you try to back feed a dead utility system you will just stall out the generator due to the high load, but under some conditions you will create a very hazardous situation for any utility personnel working on the lines.
Don(resqcapt19)
