Connection method of mechanically compressed rectangular busbars for generators in hydropower stations

Abstract

The invention discloses a connection method for a machine voltage rectangular bus of a power generator in a hydroelectric station. The connection method comprises the steps of respectively processing a connection end of a rectangular copper bus needed to be connected to form a shape with isolated gears and grooves; inserting a first upper insertion gear into a second slot; inserting a second lower insertion gear into a first slot; enabling a first tabletop and a lower surface of a second upper insertion gear to be in contact, and enabling a second tabletop and an upper surface of a first lower insertion gear to be in contact; and making a bolt to penetrate through a first bolt hole and a second bolt hole to be fixed and connected. The connection method has the advantages that the running safety and reliability of the hydroelectric station is improved, heat generation quantity is low, temperature rise is low, and a conductor at a connection part is good in thermal stability; the phase distance of the rectangular copper bus at a conductor connection part does not change, and the conductor at the connection part is good in dynamic stability; a skin effect coefficient of the conductor at a rectangular copper bus connection part is reduced, a proximity effect coefficient is also reduced, and the conductivity capability of the conductor connection part is high; and the electric energy loss of the rectangular copper bus connection part is low.

Description

technical field [0001] The invention relates to a hydropower generator machine-pressed rectangular busbar, in particular to a method for connecting a hydropower generator machine-pressed rectangular busbar. Background technique [0002] Rectangular busbars are usually used from the lead-out lines of the generator press busbars of medium-sized hydropower stations to the main transformer circuit, and the length of the busbars ranges from a dozen meters to tens of meters. The length of the generator press busbars of hydropower station generators with a large number of installed units can reach hundreds of meters. The safe and reliable operation of the generator press busbars of hydropower stations directly affects the reliable operation of the entire power station. The installation of rectangular busbars usually adopts open installation and common box busbar installation, and the current-carrying conductors are generally made of copper materials. With the development of my coun...

AI Technical Summary

Problems solved by technology

Regardless of whether the installation of the generator pressurized rectangular busbar of a hydropower station adopts an open installation or a common box busbar installation method, the current rectangular busbar connection adopts the following methods: Figure 7 There are the following problems in the lap screw connection method shown: 1. In the lap screw connection method of the rectangular copper bus bar, only one side of the rectangular copper bus bar is used for electrical connection, and the conductor contact surface at the connection is not completely matched. The resistance is large, the calorific value increases, the temperature rise increases, the thermal stability of the conductor at the connection decreases, and there are potential safety hazards

2. Rectangular copper busbars are lapped and screwed. The thickness of the conductor at the connection is double the thickness of the rectangular copper busbar. The distance between the copper busbars is correspondingly reduced, and the dynamic stability of the conductor at the connection is reduced.

3. The rectangular copper busbar is lapped and screwed, the AC current distribution in the rectangular busbar conductor is uneven, the skin effect coefficient of the conductor increases, the proximity effect coefficient also increases, and the conductivity at the conductor connection becomes poor

4. The rectangular copper busbar is connected by lap joint and screw connection, and there is power loss at the conductor connection of the rectangular busbar

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