Fixed three-phase gas-insulated transformer

Abstract

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.

Description

Technical field [0001] The invention relates to a transformer, in particular to a fixed three-phase gas insulated transformer. Background technique [0002] Voltage transformer is a device for measuring voltage and electric energy in power system or electrical control system. As the main electrical component in switch cabinet, in order to achieve three-phase voltage measurement or electrical protection, it is usually assembled by a single-phase voltage transformer. , And then install a high-voltage fuse, insulation sheath and other components in sequence, which simplifies the part of the switch cabinet to a certain extent. The primary winding has more turns, and the secondary winding turns few are supplied to the voltage coil of the instrument or relay. . In a single system, it is often necessary to use three single-phase 220kV voltage transformers for supporting use. The entire equipment is too large, requires a large number of insulators, and has a long lead wire. The dynamic...

AI Technical Summary

Problems solved by technology

In a single system, three single-phase 220kV voltage transformers are often required to be used together. The entire equipment is too large, requires a large number of insulators, and the primary lead wire is long. The dynamic and thermal stability of the device is poor.

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