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Arrangement and method for avoiding stray currents in wind power plants

A technology for wind power generation equipment and stray current, which is applied in wind power generation, circuit devices, wind turbines, etc., and can solve problems such as being expensive and generating fault currents.

Inactive Publication Date: 2014-06-25
AREVA WIND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to detect the first insulation fault, an expensive and complex insulation fault detection system needs to be implemented
[0003] A second possibility consists in implementing the network as a locally constrained network
Fault currents may still occur in the event of subsequent supply from a separate ground network
[0004] A third possibility consists in providing specific current paths parallel to the mechanical parts

Method used

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  • Arrangement and method for avoiding stray currents in wind power plants
  • Arrangement and method for avoiding stray currents in wind power plants

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Embodiment Construction

[0020] figure 1 A simplified schematic diagram of an embodiment of the invention is shown. There is a power supply 13 and an isolation transformer 12 . The isolation transformer 12 alone or in combination with the power supply 13 is called an isolation power supply 1 . The power supply 13 is grounded at the ground connection 11 . The power source 13 may be an external grid. The isolation transformer 12 has a primary side 2 and a secondary side 3 . The primary side 2 is galvanic decoupled with respect to the secondary side 3 . The primary side 2 is coupled to a power source 13 . The electrical conductor 4 is coupled to the secondary side 3 of the isolation transformer 12 . The electrical conductor 4 comprises two electrical conductors or cables 5 and 6 . Sliding contacts 17 and 18 are provided for the cables 5 and 6, respectively. This may be necessary to electrically couple the rotating and non-rotating parts of the wind power plant via the conductor 4 . The electrica...

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Abstract

The invention relates to a method and an arrangement for avoiding stray currents in a wind power plant. There is an insulating power source (1) having a galvanic decoupled secondary side (3), an electrical load (8) coupled to the secondary side of the insulating power source through an electrical conductor (5, 6) and a stray current sensitive mechanical component (7) of the wind power plant. The insulating power source is located at a first side of the stray current sensitive mechanical component and the load is located at a second side of the stray sensitive mechanical component. The electrical conductor is coupled to a common ground potential (10) at the second side.

Description

technical field [0001] The invention relates to a device and a corresponding method for avoiding stray currents in a wind power plant. Background technique [0002] Fault currents or stray currents are difficult to completely avoid in complex power grids. They can occur, for example, as stray currents at electronic filters, or as fault currents due to insulation defects of electronic devices. Systems that use a grounded grid with a neutral point or wire to ground have a particularly high risk of fault currents. The connection between the net and ground is usually placed close to the power supply, keeping the resistance between the net and ground small. The fault current will return to the power supply through the potential equalization system. Since all current-conducting parts of an installation need to be included in the potential equalization system, it is inevitable that fault currents or stray currents flow through these conducting components. Depending on the speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCF03D9/003H02J3/386Y02E10/763H02J11/00Y02E10/726F03D9/255F03D80/82F03D80/70F03D9/257H02J2300/28H02J3/381Y02E10/72Y02E10/76H02J3/18F03D80/821
Inventor R·哈格多恩
Owner AREVA WIND
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