![]() ![]() Performing the same phasor calculation, we can determine the amount of negative sequence component in a non-faulted, balanced three-phase power system. Negative sequence components in a non-faulted, three-phase power system ![]() Thus, the positive sequence component in a non-faulted, balanced system is equal to one of the phases. The vector addition of 120°and 240° corresponds to the “a” and “a2” constants in the positive sequence formula above. The following set of drawings pictorially calculates the amount of positive sequence component in a balance system. The phases are equal in amplitude and phase angle. Positive sequence components in a non-faulted, three-phase power systemīelow is a phasor diagram of a balanced, non-faulted three-phase power system. The general equations to determine these sequence quantities from a three-phase system, are as follows: ![]() There are three symmetrical components: positive, negative and zero sequence. Modern protective relays calculate symmetrical components and use these values for protection settings and logic. Although we now have computers systems to calculate and perform in-depth fault and coordination studies, there is still a need to for a thorough understanding of these theoretical components. A mathematical theorem using symmetrical components and sequence networks was the most practical method to conduct fault studies. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |