In power engineering, nodal admittance matrix (or just admittance matrix) or Y Matrix or Ybus is an n x n matrix describing a power system with n buses. It represents the nodal admittance of the buses in a power system. In realistic systems which contain thousands of buses, the Y matrix is quite sparse. Each bus in a real power system is usually connected to only a few other buses through the transmission lines. The Y Matrix is also one of the data requirements needed to formulate a power flow study.
The nodal admittance matrix form: 
Read more about Nodal Admittance Matrix: Context, Design, See Also
Famous quotes containing the words admittance and/or matrix:
“As it is with the love of the body, so with the friendship of the mind, the full is only reached by admittance to the most retired places.”
—Samuel Beckett (1906–1989)
““The matrix is God?”
“In a manner of speaking, although it would be more accurate ... to say that the matrix has a God, since this being’s omniscience and omnipotence are assumed to be limited to the matrix.”
“If it has limits, it isn’t omnipotent.”
“Exactly.... Cyberspace exists, insofar as it can be said to exist, by virtue of human agency.””
—William Gibson (b. 1948)