The　traditional　algorithms　for　location　determination　of　partial　discharge　source　are　based　on　measuring　a　specified　parameter　such　as　angle　of　arrival　(AOA)　or　time　of　arrival　(TOA).　And　then,　the　measured　parameters　are　used　to　estimate　the　source　location.　Since　the　AOA/TOA　are　measured　at　each　station　separately,　without　the　constraint　that　all　parameters　must　correspond　to　the　same　source,　the　traditional　algorithms　are　suboptimal.　We　propose　a　single　step　algorithm　that　estimate　location　based　on　least　squares.　The　new　algorithm　requires　only　a　two-dimensional　grid　search.　Experiments　in　the　laboratory　show　that　the　accuracy　of　the　proposed　algorithm　is　acceptable.