Hydro-generator box sleeve type all-insulation isolation protection device

Abstract

The invention discloses a hydro-generator box sleeve type all-insulation isolation protection device which is composed of an upper insulation shell, a lower insulation shell, an insulation sleeve, an insulation double-end stud, a locking nut A, an insulation spacer A, a locking nut B and an insulation spacer B. The hydro-generator box sleeve type all-insulation isolation protection device performs all-covering type insulation protection on the connection position of a main outgoing line of a hydro-generator, so that the insulation level at the position is effectively improved, and the local corrosion at the joint of the main outgoing line is prevented. Meanwhile, an exoskeleton type structural support can be formed, so that the structural strength at the joint of the main outgoing line is enhanced, the silver welding surface at the joint of the main outgoing line can be fixed and protected, the local cracking of the silver welding surface caused by external force impact is prevented, and the deformation risk of the main outgoing line caused by external bumping can be effectively blocked. The hydro-generator box sleeve type all-insulation isolation protection device has the characteristics of being simple in structure, being convenient to mount and dismount, being low in cost and good in stability and the like.

Description

technical field [0001] The invention relates to the technical field of hydroelectric generators, in particular to a casing-type fully insulating isolation protection device for hydroelectric generators. Background technique [0002] For vertical hydroelectric generators, when the unit is running, the water flow drives the turbine to rotate, and the rotating mechanical energy is converted into electrical energy through the electromagnetic induction between the stator and rotor of the generator, and the electrical energy is transferred from the stators of each phase and each branch through the busbars. After being drawn out from the wire rod, it needs to be output to the power grid with the main lead-out line as the final carrier. The main lead-out line is mostly made of pure copper copper bars, and the outer surface of the non-connection part is wrapped with insulating material. The connection part needs to be silver-welded during installation, so it cannot Wrap insulation. ...

AI Technical Summary

Problems solved by technology

For a long time, the insulation problem of the connection of the main lead-out line has been a difficult problem in the industry. If the insulation protection of the connection of the main lead-out line is not carried out after installation, the main lead-out The exposed copper bar at the line connection is very prone to corrosion, and the resistance at the rusted position will increase. On the one hand, it will affect the conductivity and increase the loss. On the other hand, it will greatly increase the operating temperature at this position, which is likely to cause safety hazards. Although there are bolts and studs to strengthen the joints of the lead wires, the strength of the silver soldering itself is not high. Once the external force impacts or the main lead wire body undergoes chronic deformation caused by internal stress release due to long-term operation, it may occur. Partial cracks on the silver welding surface lead to increased contact density at the connection of the main lead-out wires, abnormally high operating temperature, and even extreme accidents such as breakdown and electric fire; Although it can solve the problem of insulation and protection at this position, when the maintenance of the unit needs to temporarily disassemble the connection of the main lead wire, because the insulating material is very hard after injection and curing, it can only be used at this time. The wrapped insulating material is destructively removed by cracking, breaking, smashing and other violent methods. Since the main lead-out wire itself is made of copper bar and has low strength, the huge external force applied when removing the insulation will damage the main lead-out wire. The line body causes irreversible local deformation and damage. Once damaged, it can only be replaced as a whole, which will greatly increase the maintenance cost of the unit

Images