Three-phase large-capacity AC collector ring device for hydro-generator

Abstract

The invention discloses a hydro-generator three-phase high-capacity alternating-current collecting ring device. According to the device, a shunt ring is adopted to reduce heating when currents flow through the collecting ring device, collecting rings of the special cooling structure are adopted to enhance cooling, the collecting rings are prevented from overheating to cause accidents, and the device is very suitable for being used on a variable-speed hydro-generator. The device comprises the collecting rings, hollow conductive rods, the shunt ring, a fixing nut, a shaft insulating ring and the like, wherein the collecting rings are arranged on a top shaft of the generator. The device is composed of the three collecting rings so that a three-phase alternating current power supply can be connected conveniently, and each collecting ring is provided with two hollow conductive rods which penetrate through the top shaft of the generator and are connected with an excitation copper bar of an inner cavity. The three sets of hollow conductive rods are arranged on three different axial sections in the top shaft respectively, and are evenly distributed according to circumferential 120 degrees, installation space in the top shaft is enlarged, vibration caused by asymmetric weight in a rotating process of a unit is also eliminated, and operation stability is improved.

Description

Technical field: [0001] The invention relates to the technical field of hydraulic generators, in particular to a three-phase large-capacity AC slip ring device for a hydraulic generator. Background technique: [0002] The collector ring device is a current conduction device that guides the excitation current from the static hydroelectric generator brush holder to the rotating generator rotor. Existing hydraulic generators are all constant-speed generators, and the excitation current is direct current, and the current is not large, so the collector rings are all bipolar (positive and negative). With the emergence of new variable-speed hydro-generators, in order to ensure that the stator of the generator within the variable-speed range generates constant-frequency three-phase alternating current, its rotor must be excited by three-phase high-current alternating current. The collector ring rotating with the generator rotor at high speed and the fixed brush generate heat due to...

AI Technical Summary

Problems solved by technology

The collector ring rotating with the generator rotor at high speed and the fixed brush generate heat due to friction, and the skin effect of alternating current causes the current to be uneven on the conductive rod. Special consideration must be given to the heat generated when a large current passes through the conductor, otherwise the collector ring will be damaged. Accidents due to local overheating

Images