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Device for conducting ground currents, especially in wind power installations

A technology for grounding current and wind power equipment, applied in connection, circuit, current collector, etc., can solve the problems of increased voltage drop of contact pairing parts, bearing wear, etc., to achieve the effect of reduced voltage peak value, constant friction coefficient, and extended maintenance time period

Active Publication Date: 2019-06-07
PATNTRAC GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resulting mechanical wear of the ground ring and of the sliding contact elements in contact with said ground ring leads to an increase in the voltage drop via the contact partner
As a result, there is the risk that the shaft currents are conducted not via the device for conducting the ground current, but via the bearings, which in turn are subject to the wear that they are intended to prevent

Method used

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  • Device for conducting ground currents, especially in wind power installations
  • Device for conducting ground currents, especially in wind power installations

Examples

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Embodiment Construction

[0017] figure 1 A device, indicated generally at 10 , is shown for conducting ground currents. The device 10 includes a grounding ring 12 disposed on a shaft 14 . The shaft 14 is a component part of the rotor of an electrical machine, in particular of a rotor-fed asynchronous generator for a wind power installation. The structure and mode of operation of rotor-fed asynchronous generators are generally known and will therefore not be discussed in detail within the scope of this description.

[0018] A sliding contact element 16 is assigned to the grounding ring 12 , which comprises carbon brushes 18 with a metal embedding. The carbon brushes 18 with metal embeddings are connected to ground potential via lines 20 shown here.

[0019] Carbon brushes 18 with metal inserts are in contact with the ground ring 12 . Such arrangements are known per se.

[0020] According to the invention it is provided that the carbon brushes 18 with metal embedding have 1.2-1.28 g / cm 3 the appar...

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PUM

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Abstract

The invention relates to a device for conducting ground currents, in particular for wind power installations, for conducting ground currents from an electrical machine, the device having a grounding ring mounted on the rotor of the electrical machine and a grounded sliding contact element, which is connected to a grounding contact element. the ground ring contacts. It is provided that the sliding contact element has a carbon brush with an apparent density of 1.1-1.4 g / cm3, and the carbon brush has a metal insert made of silver, wherein the silver content is between 1% and 8% .

Description

technical field [0001] The invention relates to a device for deriving ground currents, especially in wind power installations, for deriving ground currents from electric motors, the device having a ground ring mounted on the rotor of the motor and a grounded sliding contact element, the sliding contact element being connected to the ground ring contacts. Background technique [0002] Devices in generic form are already known. [0003] Shaft voltages occur when large motors are used in grid operation and when using motors in converter operation. As soon as these shaft voltages exceed a defined threshold value (peak voltage) in the range of approximately 4 V, an electrical breakdown occurs in the hydrodynamic, only micrometer (μm) thick insulating oil film of the bearing. The electrical breakdown damages the running surfaces and leads to galvanic corrosion, which significantly reduces the static bearing service life. [0004] In addition, shaft voltages are induced in conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R39/22H01R39/20
CPCH01R39/20H01R39/26
Inventor M·法布尔B·基纳斯特W·费斯佩尔D·沃尔特
Owner PATNTRAC GMBH