Fixed three-phase gas-insulated transformer

The invention discloses a fixed three-phase gas-insulated transformer. Three voltage transformers are fixed to a shell and connected with one another in parallel. Each voltage transformer comprises an insulating layer, an insulating sealed tube, a silicone rubber umbrella skirt, an earth electrode, a secondary winding and a gas sealing ring, wherein the insulating layer, the insulating sealed tube and the gas sealing ring form an airtight cavity, the cavity is filled with insulating gas, and the two ends of the earth electrode extend to the position below the root of the cavity in a horn shape. By means of the fixed three-phase gas-insulated transformer, the problem that voltage distribution along the surface of a high-voltage current transformer is uneven can be effectively solved, the discharge voltage along the surface is increased substantially, the problem of strong electromagnetic field interference of a large current major loop is solved, an integral three-phase structure is adopted, equipment space is utilized reasonably and effectively, cost is reduced, and the structure is simple.