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Lightning protection method and device for wind generating set

A technology for wind turbines and lightning currents, applied in wind turbine components, wind engines, wind power generation, etc., can solve problems affecting the safe operation of wind turbines, endangering the reliability of pitch bearings, and damage to pitch bearings, etc. Achieve flexible installation methods, good electrical conductivity, and low cost

Inactive Publication Date: 2013-01-30
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the lightning protection method from the blade to the hub is to connect the down conductor of the blade to the flange of the blade root, and the flange of the blade root is connected to the pitch bearing on the hub. Generally, a slip ring device and a discharge gap are used to bypass the lightning current to avoid Most of the lightning current passes through the pitch bearing, but these devices can only divert a part of the lightning current, and a part of the lightning current will still flow through the pitch bearing. After the lightning current flows through the pitch bearing for a long time, it will make the pitch bearing Rollers and rings are damaged, which jeopardizes the operational reliability of the pitch bearing and affects the safe operation of the wind turbine
In addition, the lightning current will also pass through the hub, which will interfere and damage the weak current equipment (such as sensors, encoders, etc.) on the hub, thus affecting the normal and safe operation of the wind turbine.

Method used

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  • Lightning protection method and device for wind generating set
  • Lightning protection method and device for wind generating set
  • Lightning protection method and device for wind generating set

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 , figure 2 As shown, a down conductor 2 is laid in the blade 1, and the down conductor 2 in the blade 1 is laid inside the blade 1, and is connected to the carbon brush holder 3 on the surface of the blade 1 near the blade root, and the carbon brush holder 3 is used for fixing The carbon brush 5, the lead wire 4 of the carbon brush 5 is connected to the carbon brush bracket 3, and the carbon brush 5 is brushed to the conductive ring 6 fixed on the hub cover 7, so that the electrical connection between the blade 1 and the hub cover 7 is realized. When the current hits the blade air-termination device, the discharge path of the lightning current is the blade air-termination device--the down conductor--the carbon brush on the surface of the blade--the conductive ring on the hub cover, so that the lightning current is conducted to the hub cover Then the hubcap transmits the lightning current to the nacelle cover through the lightning device, and then to t...

Embodiment 2

[0031] Such as image 3 , Figure 4 As shown, a downconductor 2 is laid in the blade 1, and the downconductor 2 in the blade 1 is laid inside the blade 1, and is connected to the conductive ring 6 on the surface of the blade near the blade root, and a carbon is fixed in the hubcap 7 The brush bracket 3 is used to install the carbon brush 5, the carbon brush 5 is connected to the conductive ring 6, and the carbon brush lead wire 4 connected to the carbon brush 5 is also fixed on the carbon brush bracket 3, and the carbon brush 5 is used to transition to connect the blade 1 and the hub cover 7, so as to realize the electrical connection between the rotating parts. When the lightning current hits the blade lightning receptor, the discharge path of the lightning current is the blade lightning receptor-down conductor-blade surface conductive ring- —Carbon brush——hub cover, so that the lightning current is conducted to the hub cover, and then the hub cover conducts the lightning cu...

Embodiment 3

[0033] Such as Figure 5 , Figure 6 As shown, the down conductor 2 is laid in the blade 1, and the down conductor 2 in the blade 1 is laid inside the blade 1. The difference between embodiment 3 and embodiment 1 is that in embodiment 3, the carbon brush holder 3 Installed in the vertical direction next to the blade root, the carbon brush lead wire 4 is connected to the down conductor 2, the conductive ring 6 is hooped on the side of the hubcap 7, and the carbon brush 5 is connected to the conductive ring 6. In this way, the electrical connection between the blade 1 and the hubcap 7 is realized. When the lightning current hits the blade lightning receptor, the discharge path of the lightning current is the blade lightning receptor—the down conductor—the carbon brush on the blade surface— —The conductive ring on the hubcap, so that the lightning current is conducted to the hubcap, and then the hubcap conducts the lightning current to the nacelle cover through the lightning dev...

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Abstract

The invention provides a lightning protection method and device for a wind generating set. A lightning arrester, a down lead and a sliding contact conducting structure are used to construct a lightning current discharge path of a blade, a hub cap, a cabin cover and the ground, wherein the down lead is laid inside the blade; the sliding contact conducting structure comprises two connecting terminals produced by using good electrical conductors; one connecting terminal is arranged at the root of the blade; the other connecting terminal is arranged on the hub cap; when the blade rotates, sliding contact is formed between the two connecting terminals and is used for leading lightning current on the blade to the hub cap; the down lead is connected with the lightning arrester and the connecting terminal of the sliding contact conducting structure, which is arranged at the root of the blade; the connecting terminal of the sliding contact conducting structure, which is arranged on the hub cap, is connected with a lightning current channel of the cabin of the wind generating set, and thus the lightning current discharge path of the blade, the hub cap, the cabin cover and the ground is formed; and the lightning current is completely prevented from flowing through a variable pitch bearing, and thus the safety of the variable pitch bearing is ensured.

Description

technical field [0001] The invention relates to lightning protection technology for wind power generators, in particular to a lightning protection method and device for wind power generators. Background technique [0002] As a clean and renewable energy, wind energy has huge reserves and is increasingly valued by countries all over the world. With the increase of the capacity of a single wind turbine, the diameter of the wind rotor increases, and the height of the wind turbine from the ground is also increasing. In addition, wind turbines are generally located in open areas such as plains or high mountains, and these areas are lightning-prone areas. Therefore, the lightning protection safety of wind turbines has received increasing attention. [0003] When a wind turbine is struck by lightning, the bearing is the most vulnerable part of the unit. At present, the lightning protection method from the blade to the hub is to connect the down conductor of the blade to the flang...

Claims

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Application Information

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IPC IPC(8): F03D11/00H01R39/64
CPCY02E10/722
Inventor 袁乐曹国荣袁莹李音泉
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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