1. Scheme Overview

1.1 Design Background

Wind power generation is the fastest developing green energy technology in the world. Compared with traditional energy, wind power generation does not rely on external energy, has no fuel price risk and stable power generation cost. With the rapid development of land wind farm construction, people have found some restrictions on the utilization of land wind power, such as large land area, noise pollution and other problems. Due to the abundant offshore wind resources and the feasibility of today's technology, offshore will become a rapidly developing wind power market.

1.2 Design Objectives

Offshore wind power is much bigger than the risk of land wind, technical difficulty is higher, sea conditions, poor accessibility, operation and maintenance of the offshore wind turbines has brought the huge challenge, seawater salinity is high, corrosion resistance, the surface is often fog, rain and typhoon, such as bad natural conditions, for the normal operation of the wind turbines has a very high requirements. Not only is the external environment of wind turbine operation harsh, China's wind power technology is still in the development stage, the relevant unit technology, construction technology, transmission technology, operation and maintenance technology has not been fully mature, wind power units under the dual influence of external environment and internal technology are prone to operating faults, so it is necessary to timely test. How to more effectively and more targeted found problems in the process of operation of fan, wind power technology is an important part in the whole process, fan operation process, for example, the fan in the process of operation, will produce great power, the equipment and transmission equipment will produce a lot of heat, the temperature of the present different, when equipment failure or malfunction happens, surface temperature of the equipment can significantly change, such as short circuit when the moment through a lot of current, leading to higher temperature anomalies, the short circuit current, and significantly lower than the surrounding temperature, etc., by monitoring the temperature of the unit equipment is an effective solution, It can guarantee the normal operation of the unit.

2. Design Description

The role of infrared thermal camera in wind power generation

l l Electrical equipment wire connector, internal diversion loop joint detection

l l All kinds of conductive connector, wiring pile head oxidation corrosion defects and bad contact

l l All kinds of high voltage switch in contact center contact undesirable defect

l l Isolation and blade and contact breaker and turn the cap with the ball head bad defects

l l Power transformer under high and low pressure casing, bad connection on both ends

l l Clamp fever detection

l l Cable joint detection

l l Wind turbines (including main bearing, coupling, etc.) hot fault monitoring

l l Generator, control cabinet fever fault monitoring

3. Design Scheme

3.1 Overview of system design

The system design consists of two parts: monitoring front (monitoring point) and monitoring center. The main functions of the monitoring center are: early warning, display, control, video recording and video digitalization and networking. The monitoring center can patrol the designated area, collect images and analyze temperature data, search for the highest temperature in real time and warn of temperature anomalies in real time. Real-time monitoring and viewing the infrared image and video data of each monitoring point. The monitoring center can automatically or manually switch out the image of each monitoring point.

3.4 System design scheme

3.4.1 Site investigation

FIG. 3.2 Site of engine room

Figure 3.3 Tower bottom inverter

3.4.2 Installation location

FIG. 3.4 Engine room installation plan

FIG. 3.5 Roof mounting of engine room

3.4.3 Selection of thermal imager

(1) Thermal imager selection

According to the working temperature of engine room to Yoseen X series infrared thermal imager, a resolution of 160 X 120, the thermal imager as part of the on-line temperature measuring type infrared thermal imager, the ir by receiving object, through a series of processing, can form hot like figure on the surface of the object, and the relevant parts of the temperature measurement, help find fault hidden trouble.

(2) Lens selection

The thermal imager is mounted on the top to ensure that the view Angle of the thermal imager covers the designated monitoring area of the unit and the frequency converter. The size of the engine room is 12×5×5m. The top two cameras are used for monitoring. The size of the frequency converter is 5×3m, and the top tilt installation monitoring method is adopted. According to the calculation, the lens of 3mm is adopted. The system consists of two engine rooms and two frequency converters, totaling six sets.

3.5 System composition

Infrared thermal imaging Offshore wind power image monitoring system is composed of central monitoring management system, transmission system, infrared thermal imaging system and power supply system.

3.6 System functions

3.6.1 High temperature warning function

By using infrared thermal imager and other equipment, the system can realize the following high temperature warning function

(1) Manually or automatically turn on infrared thermal imaging and other devices to monitor, collect images and analyze temperature data in the designated area, search for the highest temperature in real time, and display the highest temperature in the current field of view in real time.

(2) The collected infrared images can be stored in the database, analyzed and compared with the support of the database management system, and the set data can be used to determine whether to send an early warning signal.

3.6.2 General functions

(1) Monitoring function

Real-time display of infrared thermal imaging equipment images.

Multi-screen simultaneous monitoring.

(2) Control alarm function

Set the temperature alarm freely.

Remote alarm information receiving and processing and system log view.

(3) Video playback function

Automatic storage of alarm data, manual storage at any time, and playback of recorded data at any time.

(4) Network functions

Remote real-time display of infrared thermal imaging equipment image temperature situation.

Receive high temperature warning signal and other alarm information remotely and in real time.

Remote query and playback of front-end historical images and saved early warning video.

Remote video file download.

Supports RTSP streaming media protocol.