Patent ID: 8373309

Claim:
A method for selectively connecting a first electrical system and a second electrical system, the method comprising: sampling a first alternating electric current of the first electrical system including a generator and having a first frequency at a sampling frequency to obtain a first set of data samples, the sampling frequency corresponding to a system frequency of the first electrical system or the second electrical system multiplied by a sampling rate; sampling a second alternating electric current of the second electrical system including an interne and having a second frequency at the sampling frequency to obtain a second set of data samples; converting at least one of the first set of data samples and the second set of data samples to a converted set of data samples using a conversion algorithm to compensate for a frequency difference between the first frequency and the second frequency; determining when the converted set of data samples and at least one of the first set of data samples and the second set of data samples satisfy a predetermined condition; and actuating a breaker when the predetermined condition is satisfied to selectively connect together the first electrical system and the second electrical system.