14 - Component Identification

Question 1

The ability to explain what RDS-PP coding is and the main aspects of the coding.

Answer 1

RDS-PP coding is a way of labelling components and give idea to their placement within the WTG. The Code starts from the top of the WTG in the Hub and all components in the Hub are represented by numbers between 10-19. The further down the turbine you go the higher the number will be. The numbers end at the Foundation with the numbers between 90-99.
Placement Positions
10-19: Rotor
20-29: Transmission System
30-39: Gearbox
40-49: Generator
50-59: Nacelle Housing
60-69: Yaw Section
70-79: Tower
80-89: Transition Piece
90-99: Foundation/Monopole

Question 2

The ability to explain or demonstrate the function of the main cabinets in the WTG.

Answer 2

Rotor
-	Hub Control Cabinet +MDY10UC001
Nacelle
-	CPR Control Cabinet +MDY50UC015
-	Auxiliary Power AC Cabinet +MDY50UC016
-	Auxiliary Power DC Cabinet +MDY50UC017
-	Hydraulic Station
-	Cooling Liquid Tank
-	Gearbox
Generator
-	MSI PPR (Power Production) +MDY40UC014
-	Turner Gear
Tower PCM 3
-	Tower Auxiliary Power Cabinet +MDY70UC013
-	Tower PC Cabinet +MDY70UC016
-	Auxiliary Power Breaker Cabinet +MDY70UC003
-	Auxiliary Transformer
-	Back-up Power Supply
Tower PCM 2
-	LSI Cabinet +MDY70UC014
Transition Piece
-	Transition Piece Control Cabinet +MDY80UC001
-	Light System Cabinet +MDY75UC001

Question 3

The ability to explain or demonstrate the function of all main components. - Conditioning and Cooling

Answer 3

• Water Cooling System between the Nacelle and tower and is built up of heaters, heat exchangers and pump units in order to provide cooling for the HPU, Main Bearings, GBX, Generator and converters.
• Conditioning system between the Nacelle and tower and is built up of fans, heaters and filters to remove impurities from the sea air that could potentially damage components.

Question 4

The ability to explain or demonstrate the function of all main components. - Control System

Answer 4

• The control system monitors the WTG, giving action and information as different circumstances arise. The control system interfaces with the operator panels, Vestas online toolkit and SCADA. This allows information to be accessed not only while on the WTG but also from onshore.
• The control system is built up from Industrial PC’s, CT6061 & CAN I/O Modules and CT480 VPC & CT6003 boards.

Question 5

The ability to explain or demonstrate the function of all main components. - Converter System

Answer 5

• Is built up of the MSI and LSI.
• The 3 phase Generator will produce a variable frequency voltage that feeds into the MSI. The MSI converts the variable AC voltage to DC in order to be transferred down the tower via the DC link. The reason for this is there are less transmission losses when in DC. The AC generated through the Generator is converted to DC within the PSC modules in the MSI and the AGO resistors will dissipate any excess energy, keeping the DC link at a constant voltage.
• The DC link runs into the LSI where it is converted back to AC via the PSC modules. The voltage coming out of the LSI will be fixed frequency 640VAC where the IGBT controllers will create the fixed frequency of 50/60Hz in order to synchronize with the local grid. Any excess frequencies will be burned off by the Grid chokes.

Question 6

The ability to explain or demonstrate the function of all main components. - Drivetrain

Answer 6

• The drivetrain transfers mechanical power generated through the rotation of the hub into electrical power. The drivetrain is built up from the main bearing, main axel, coupling, gearbox and generator.

Question 7

The ability to explain or demonstrate the function of all main components. - Hydraulic System

Answer 7

• The hydraulic system is powered by the HPU (Hydraulic Power Unit) which provides 260 Bar of pressure. The HPU’s main consumer is for the actuation of the pitching of the blades. Further consumers of the HPU include Crane operation, Roof opening/closing, the Turner gear, mechanical brake and the Sliding tool (when exchanging major components).

Question 8

The ability to explain or demonstrate the function of all main components. - Power Supply System and Transformer

Answer 8

• From the LSI the 640VAC passes into a HV transformer (either 33kV or 66kV) and an Auxiliary transformer. The Auxiliary transformer supplies the IPS (leaving the transformer at 400VAC) and the IPS will supply all consumers within the turbine.
• The IPS will supply the Tower auxiliary cabinet that contains the battery backup system in case of complete disconnection from the grid. In circumstances where backup mode is necessary, the batteries will supply the WTG with 400VDC to power the turbines critical systems.
• In normal operation the IPS will supply the turbine with 400VAC that will enter the Nacelle through the Nacelle AC Auxiliary cabinet. In this cabinet 230/400VAC will be distributed to the (non-critical) Nacelle and Hub systems, the lighting system supplied and normal operation via UPS backup.
• The 400VAC from the AC cabinet will feed the Nacelle DC auxiliary cabinet. Within this cabinet are two rectifiers that convert the 400VAC to 560VDC. This cabinet distributes the power to the hub and all critical systems. When the incoming voltage is less that 450VDC ‘power save mode’ will be triggered and when less than 400VDC only the critical systems will be supplied with voltage. – Critical Systems: Control & Protection system, Switchgear control, Ready to Protect system, Central Lubrication system, Yaw system and Wind sensors.

Question 9

The ability to explain or demonstrate the function of all main components. - Safety System

Answer 9

• The safety system are made up from PILZ safety system hardware that will supervise the safety parameters within the WTG and are connected to one another with ethernet switches. The safety system will stop motion and rotation under circumstances of controller function errors, Internal & External failures and Dangerous events.

Question 10

The ability to explain or demonstrate the function of all main components. - Yaw System

Answer 10

• The Yaw system consists of 10 VFD driven permanent magnet motors with an encoder in order to rotate the Nacelle into the wind. A wind sensor onto of the turbine will measure wind speed and direction, giving information back to the CAN I/O modules which will then command and communicate with the PLC. The Yaw PLC acts upon the control command, monitoring the VFD’s, load sharing and autonomous system. The Yaw VFD’s will synchronize the yaw drives and rotate the Nacelle.