A substation frame (100, 200), comprising: at least two supporting assemblies arranged at intervals along a first direction, wherein all the supporting assemblies comprise a first supporting part and a second supporting part that are connected to each other; and a beam assembly (120, 220) provided between two adjacent supporting assemblies and comprising two ends, and flange assemblies provided between the supporting assemblies and the ends of the beam assembly (120, 220), wherein an end of the supporting assemblies and an end of the beam assembly (120, 220) are respectively connected to the flange assemblies; wherein the first supporting part is located between the beam assembly (120, 220) and the second supporting part, wherein the first supporting part is made of composite insulating material and wherein the beam assembly either; (i) is made of composite insulating material, or (ii) comprises an intermediate segment and edge segments disposed at both ends of the intermediate segment, wherein the edge segments are made of composite insulating material, and the intermediate segment is made of metal material; characterized in that: the second supporting part is made of metal material; the substation frame (100, 200) further comprises a first attachment plate provided at a connection position between the beam assembly (120, 220) and the flange assemblies, wherein the first attachment plate is provided with a first wire attaching hole for attaching a conducting wire. at least two supporting assemblies arranged at intervals along a first direction, wherein all the supporting assemblies comprise a first supporting part and a second supporting part that are connected to each other; and a beam assembly (120, 220) provided between two adjacent supporting assemblies and comprising two ends, and flange assemblies provided between the supporting assemblies and the ends of the beam assembly (120, 220), wherein an end of the supporting assemblies and an end of the beam assembly (120, 220) are respectively connected to the flange assemblies; wherein the first supporting part is located between the beam assembly (120, 220) and the second supporting part, wherein the first supporting part is made of composite insulating material and wherein the beam assembly either; (i) is made of composite insulating material, or (ii) comprises an intermediate segment and edge segments disposed at both ends of the intermediate segment, wherein the edge segments are made of composite insulating material, and the intermediate segment is made of metal material; (i) is made of composite insulating material, or (ii) comprises an intermediate segment and edge segments disposed at both ends of the intermediate segment, wherein the edge segments are made of composite insulating material, and the intermediate segment is made of metal material; characterized in that: the second supporting part is made of metal material; the substation frame (100, 200) further comprises a first attachment plate provided at a connection position between the beam assembly (120, 220) and the flange assemblies, wherein the first attachment plate is provided with a first wire attaching hole for attaching a conducting wire. the second supporting part is made of metal material; the substation frame (100, 200) further comprises a first attachment plate provided at a connection position between the beam assembly (120, 220) and the flange assemblies, wherein the first attachment plate is provided with a first wire attaching hole for attaching a conducting wire.