DE19748716C1 - Rotor blade heater and lightning diverter for wind turbine operation in sub-zero conditions - Google Patents

Rotor blade heater and lightning diverter for wind turbine operation in sub-zero conditions

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Publication number
DE19748716C1
DE19748716C1 DE19748716A DE19748716A DE19748716C1 DE 19748716 C1 DE19748716 C1 DE 19748716C1 DE 19748716 A DE19748716 A DE 19748716A DE 19748716 A DE19748716 A DE 19748716A DE 19748716 C1 DE19748716 C1 DE 19748716C1
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DE
Germany
Prior art keywords
conductors
rotor blade
lightning
blade
transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE19748716A
Other languages
German (de)
Inventor
Georg Boehmeke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aerodyn Engineering GmbH
Original Assignee
Aerodyn Engineering GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aerodyn Engineering GmbH filed Critical Aerodyn Engineering GmbH
Priority to DE19748716A priority Critical patent/DE19748716C1/en
Application granted granted Critical
Publication of DE19748716C1 publication Critical patent/DE19748716C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D45/00—Aircraft indicators or protectors not otherwise provided for
    • B64D45/02—Lightning protectors; Static dischargers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/32—Rotors
    • B64C27/46—Blades
    • B64C27/473—Constructional features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/30—Lightning protection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/40—Ice detection; De-icing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Wind Motors (AREA)

Abstract

The turbine blade heater and lightning diverter are provided by at least two conductors (10) incorporated in the rotor blade, which are used for supplying the electric heating current provided by a step-down transformer (12) to a coiled heating wire, at least one of the conductors coupled to an lightning diverter (14). The conductors have an electrical resistance of the order of 0.1 Ohms for an electric heating current of about one hundred A and a voltage of about 10 V.

Description

Die Erfindung betrifft eine Rotorblatt-Heizung und eine Blitzableitungseinrichtung.The invention relates to a rotor blade heater and Lightning arrester.

Bekannt sind Heizfolien zum Heizen der Rotorblätter in vereisungsgefährdeten Gebieten. Weiterhin werden in Rotorblättern Blitzstrom-Ableitungseinrichtungen einge­ baut, die entweder als eingebettetes Metallgewebe oder im Blattinneren als eingelegte Leiter realisiert sind. Heating foils for heating the rotor blades are known in areas at risk of icing. Furthermore, in Rotor blades lightning current discharge devices turned on builds that either as embedded metal mesh or are implemented as inlaid conductors inside the sheet.  

Übliche Heizfolien sind nicht blitzstrom-tragfähig, da sie mit zu geringen wirksamen Querschnitten ausgerüstet sind und auch ihre Struktur sich nicht für Blitzstromab­ leitung eignet. Bei Verwendung von Heizfolien sowie Blitzstrom-Ableitungseinrichtungen nebeneinander in ei­ nem Rotorblatt ist weiter nicht sichergestellt, daß der Blitzstrom den Weg über den Ableiter und nicht über die Heizeinrichtungen nimmt und die Heizfolien so vielleicht dennoch zerstört werden.Usual heating foils are not lightning current-carrying, because they are equipped with insufficient effective cross-sections and their structure is not suitable for lightning current line is suitable. When using heating foils as well Lightning current discharge devices side by side in one Nem rotor blade is further not ensured that the Lightning current the way over the arrester and not over the Heaters and so maybe the heating foils still be destroyed.

Aufgabe der Erfindung ist es, eine einfache Rotorblatt- Heizung neben einer Blitzstrom-Ableitung zu realisieren.The object of the invention is to provide a simple rotor blade Heating in addition to a lightning current discharge.

Erfindungsgemäß wird dies durch die Merkmale des Haupt­ anspruchs gelöst. Die Unteransprüche geben vorteilhafte Ausführungsformen der Erfindung wieder.According to the invention, this is due to the features of the main demanding solved. The subclaims give advantageous Embodiments of the invention again.

Insbesondere ist vorteilhaft, daß durch die Vereinigung beider Systeme sichergestellt wird, daß nicht das Heiz­ system durch Blitzschlag zerstört wird.It is particularly advantageous that through the union both systems ensure that the heating system is destroyed by lightning.

Durch die Anordnung zweier oder mehrerer benachbarter Leiter, die entlang des Blattes im Mastbereich des Pro­ fils verlaufen, und im Nabenbereich an die Niederspan­ nungswicklung eines Transformators angeschlossen sind, wird der Blitzstrom-Ableiter in Doppelfunktion durch die als Verlustwärme an ihrem ohmschen Widerstand anfal­ lende Wärme als Heizelement, wie auch als Ableiter wir­ ken.By arranging two or more neighboring ones Ladder running along the blade in the mast area of the Pro fils run, and in the hub area to the Niederspan the winding of a transformer are connected, the lightning current arrester has a double function which occurs as heat loss at their ohmic resistance heat as a heating element, as well as a conductor ken.

In der Blattspitze kann ein Leiter bereichsweise unter der Kappe verlegt werden, um auch diese mit zu heizen. Die Leiter können weiter durch Kohlefasergurte auf Ober- und Unterseite ersetzt werden, die direkt als Leiter be­ nutzt werden können, sofern das Blatt mit einer tragen­ den Struktur aus Kohlefasergurten aufgebaut ist.In the tip of the leaf, a conductor can be partially under the cap to be installed in order to heat it as well. The ladder can continue through carbon fiber belts on top and bottom to be replaced, which can be used directly as a conductor  can be used, provided the sheet with a wear the structure is made up of carbon fiber belts.

Bei Wahl von separaten Leitern können diese vorzugsweise flach und gekreuzt ausgebildet werden, um so durch eine symmetrische Aufteilung des Blitzstromflusses uner­ wünschte Stromanteile durch die Niederspannungswicklung des Trafos möglichst zu vermeiden.If separate conductors are selected, these can be preferred be formed flat and crossed, so by one symmetrical distribution of the lightning current flow wanted power shares through the low voltage winding avoid the transformer if possible.

Falls isolierte Metallkabel im Blattinneren Verwendung finden, können diese selbst ein- oder mehrfach durch den Kern gesteckt werden, um dadurch die Niederspannungs­ wicklung zu bilden.If insulated metal cables are used inside the sheet you can find them yourself one or more times through the Core to be plugged in, thereby reducing the low voltage to form winding.

Auf der Hochspannungsseite kann für den Fall, daß der Blitzstrom unsymmetrisch auf dem Leiter fließt, eine be­ trächtliche Spannung induziert werden, die jedoch durch ein Überspannungsableiter des Trafos begrenzt werden können.On the high voltage side, in the event that the Lightning current flows asymmetrically on the conductor, a be pregnant voltage induced, however, by a surge arrester of the transformer can be limited can.

Außerdem wird vorgeschlagen, die Niederspannungswicklung in der Mitte zu erden, da dann zwei gegenläufig jeweils Teile der Niederpannungswicklung durchlaufende Blitz­ stromanteile sich im Trafo in der Auswirkung auf die Hochspannungssseite aufheben.It also suggests the low voltage winding to be grounded in the middle, since then two in opposite directions Parts of the low voltage winding flash going through Current components in the transformer affect the Pick up the high voltage side.

Weiter kann statt eines mit Netzfrequenz betriebenen Trafos ein leichterer mit höherer Frequenz gespeister Trafo, als Ring- oder Schalenkern ausgebildet, Verwen­ dung finden.Furthermore, instead of one operated at mains frequency Transformers a lighter fed with higher frequency Transformer, designed as a ring or shell core, use find.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus nachfolgender Beschreibung eines bevorzugten Ausfüh­ rungsbeispiels anhand der beigefügten Zeichnung. Dabei zeigt:Further advantages and features of the invention result from the following description of a preferred embodiment  Example using the attached drawing. Here shows:

Fig. 1 den prinzipiellen Aufbau, bei dem eine elektrische Verbindung zwischen dem Blitzableiter und der Nabe hergestellt ist, Fig. 1 shows the basic structure in which an electrical connection is made between the lightning conductor and the hub,

Fig. 2 den gleichen Aufbau, wobei eine elektri­ sche Verbindung zwischen Leitern mit ei­ ner den Blitzstrom von den metallischen Teilen Nabe und Welle fernhaltenden Ein­ richtung über schleifende Kontakte oder Funkenstrecken realisiert ist, Fig. 2 shows the same structure, wherein a specific electrical connection between conductors with egg ner the lightning current from the metallic parts of the hub and shaft remote retentive A direction is realized by means of sliding contacts or a spark gap,

Fig. 3 den gleichen Aufbau, wobei eine elektri­ sche Verbindung zwischen Leitern mit ei­ ner den Blitzstrom von den metallischen Teilen Nabe und Welle fernhaltenden Ein­ richtung über schleifende Kontakte oder Funkenstrecken realisiert ist. Fig. 3 shows the same structure, with an electrical connection between conductors with egg ner the lightning current from the metallic parts hub and shaft keeping a device is realized via sliding contacts or spark gaps.

Fig. 4a den Schnitt durch ein Rotorblatt und die Lage der verstärkenden Kohlefasergurte, FIG. 4a is a section through a rotor blade and the location of the reinforcing carbon fiber belts,

Fig. 4b eine Draufsicht auf einen Abschnitt des Rotorblatts bei dem zusätzlich die Kon­ taktierung der Kohlefasergurte darge­ stellt ist, FIG. 4b is a plan view of a portion of the rotor blade in addition, the clocking of Kon the carbon fiber straps provides Darge is

Fig. 5 den schematischen Lauf von gekreuzten Leiter ab der (metallischen) Blattspit­ zenkappe, und Fig. 5 shows the schematic run of crossed conductors from the (metallic) blade tip zenkappe, and

Fig. 6 den gleichen Aufbau schematisch als Schaltbild. Fig. 6 shows the same structure schematically as a circuit diagram.

Der in den Fig. 1-3 dargestellte Trafo wird mit Netz­ frequenz und einer üblichen Spannung von ca. vier- bis siebenhundert Volt versorgt er wird im Bereich des Blattflansches bereits im wesentlichen aus der Rotornabe ausgerückt im Blatt angeordnet.The transformer shown in Figs. 1-3 is frequency with power and a common voltage of about four to seven hundred volts supplied it is already arranged substantially disengaged from the rotor hub in the region of the blade flange in the leaf.

Die Leiter 10 werden auf der Niederspannungsseite vor­ teilhafterweise mit einer Spannung von fünf bis zwanzig Volt versorgt, so daß ein Strom von ungefähr fünfzig bis hundert Ampere fließt.The conductors 10 are advantageously supplied with a voltage of five to twenty volts on the low voltage side, so that a current of approximately fifty to one hundred amperes flows.

Mit Bezugszeichen 14 und 16 ist weiter eine elektrische Kontaktstrecke zwischen den Leitern 10 auf der Nieder­ spannungsseite des Trafos 12 angedeutet, die den elek­ trischen Kontakt zwischen dem Blatt und der Nabe her­ stellt. Der Blitzstrom wird daher hier über die Nabe und die Welle im Turm abgeleitet werden.Reference numerals 14 and 16 further indicate an electrical contact path between the conductors 10 on the low voltage side of the transformer 12 , which provides the electrical contact between the blade and the hub. The lightning current will therefore be dissipated here via the hub and the shaft in the tower.

In der Fig. 2 ist in einer alternativen Darstellung eine Stromabführung an Nabe und Welle vorbei über eine Fun­ kenstrecke oder eine Schleifkontaktverbindung vorgese­ hen. Der Blitzstrom kann dann außen am Turm abgeleitet werden.In Fig. 2, in an alternative representation, a current dissipation past the hub and shaft via a spark gap or a sliding contact connection is provided. The lightning current can then be derived from the outside of the tower.

Um zu verhindern, daß der Blitzstrom zum Teil durch die Niederspannungswicklung des Trafos fließt und dadurch in der Hochspannungswicklung Überspannungen induziert, wer­ den die Leiter einander kreuzend angeordnet. Weiter wird vorgeschlagen (Fig. 3), eine Blitzstromerdung an die Mitte der Niederspannungswandlung 20, die durch die Lei­ ter 10 gebildet wird, anzulegen.To prevent the lightning current from flowing in part through the low-voltage winding of the transformer and thereby inducing overvoltages in the high-voltage winding, who arranged the conductors crossing one another. It is also proposed ( Fig. 3) to apply lightning current grounding to the center of the low-voltage conversion 20 , which is formed by the conductor 10 .

Der Trafo sollte weiter durch isolierte Kabel eine höhe­ re Spannungsfestigkeit aufweisen, als die Spannungsab­ fälle an den Blitzstromableitungseinrichtungen 14, 16 oder 18 die vorteilhafterweise die Niederspannungsseite des Trafos mittig an der Wicklung erden.The transformer should also have a higher voltage resistance through insulated cables than the voltage drops at the lightning current discharge devices 14 , 16 or 18 which advantageously ground the low-voltage side of the transformer in the center of the winding.

Es darf aber nicht vergessen werden, daß selbst wenn zu­ dem einmal die Heizeinrichtung bei einem Blitzschlag zerstört wird, ist dies noch als erfolgreiche Blitzab­ leitung zu werten, da der blitzableitende Teil und zudem das Blatt und die restliche Windkraftanlage unzerstört verbleiben.But it should not be forgotten that even if too the heating device during a lightning strike is destroyed, this is still a successful Blitzab to evaluate line, since the lightning-dissipating part and also the blade and the rest of the wind turbine undamaged remain.

Die Leiter können mit ihrer Ummantelung ohne Auftrennung von der Blattspitze um den Trafokern gewickelt zur Blattspitze verlaufen, oder es können durch Anschluß­ stücke flächig im Blatt ausgebildete Leiter angeschlos­ sen werden (Fig. 4a und 4b). Der Transformator wird wei­ ter auf der Hochspannungsseite noch durch Überspannungs­ ableiter gegen Spannungsdifferenzen geschützt werden können, wie dies in Fig. 6 als Schaltschema angegeben ist.The conductors can run with their sheathing without separation from the tip of the blade around the transformer core to the tip of the blade, or it can be formed by connecting pieces of flat conductors in the blade ( Fig. 4a and 4b). The transformer is further on the high voltage side can still be protected against voltage differences by surge arresters, as indicated in Fig. 6 as a circuit diagram.

Claims (5)

1. Rotorblatt-Heizung und Blitzableitungseinrichtung mit wenigstens zwei Leitern (10) im Rotorblatt, ge­ kennzeichnet durch
  • 1. eine über einen Transformator (12) den auf der Niederspannungsseite angeschlossenen Heizdraht mit Heizenergie versorgende Stromzuführung und
  • 2. eine vor diesem Trafo angeordnete Blitzstrom- Ableitung (14, 16, 18), die mit wenigstens einem der Leiter (10) in elektrischem Kontakt steht,
    wobei die Leiter (10) mit einem Widerstand von ca. einem Zehntel Ohm für einen Heizstrom von ca. ein­ hundert Ampere bei einer Spannung von ca. zehn Volt ausgebildet sind.
1. rotor blade heater and lightning discharge device with at least two conductors ( 10 ) in the rotor blade, characterized by
  • 1. a via a transformer ( 12 ) supplying the heating wire connected to the low voltage side with heating energy and
  • 2. a lightning current lead ( 14 , 16 , 18 ) arranged in front of this transformer, which is in electrical contact with at least one of the conductors ( 10 ),
    the conductors ( 10 ) being designed with a resistance of approximately one tenth of an ohm for a heating current of approximately one hundred amperes at a voltage of approximately ten volts.
2. Rotorblatt-Heizung und Blitzableitungseinrichtung nach Anspruch 1, gekennzeichnet dadurch, daß im Blatt vorhandene Kohlefasergurte als Leiter (10) Verwendung finden. 2. Rotor blade heating and lightning conductor device according to claim 1, characterized in that carbon fiber belts present in the blade are used as conductors ( 10 ). 3. Rotorblatt-Heizung und Blitzableitungseinrichtung, nach einem der vorangehenden Ansprüche, dadurch ge­ kennzeichnet, daß die Leiter (10) sich über die Länge des Blattes kreuzen.3. rotor blade heating and lightning discharge device, according to one of the preceding claims, characterized in that the conductors ( 10 ) cross over the length of the blade. 4. Rotorblatt-Heizung und Blitzableitungseinrichtung nach einem der Ansprüche 1 oder 3, gekennzeichnet durch isolierte, metallische Leiter (10) im Blatt, die ohne Auftrennung auf der Niederspannungswicklung eines Trafos die Wicklung bilden.4. rotor blade heater and lightning conductor device according to one of claims 1 or 3, characterized by insulated, metallic conductors ( 10 ) in the blade, which form the winding without separation on the low-voltage winding of a transformer. 5. Rotorblatt-Heizung und Blitzableitungseinrichtung nach einem der vorangehenden Ansprüche, gekennzeichnet durch eine Blitzstrom-Erdung (18) der Leiter auf der Niederspannungswicklung (20), die an die Mitte der Niederspannungswicklung (20) angeschlossen ist.5. rotor blade heater and lightning discharge device according to one of the preceding claims, characterized by a lightning current grounding ( 18 ) of the conductor on the low-voltage winding ( 20 ) which is connected to the center of the low-voltage winding ( 20 ).
DE19748716A 1997-11-05 1997-11-05 Rotor blade heater and lightning diverter for wind turbine operation in sub-zero conditions Expired - Fee Related DE19748716C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19748716A DE19748716C1 (en) 1997-11-05 1997-11-05 Rotor blade heater and lightning diverter for wind turbine operation in sub-zero conditions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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DE19748716C1 true DE19748716C1 (en) 1998-11-12

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Cited By (41)

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EP1011182A1 (en) * 1998-12-14 2000-06-21 Minnesota Mining And Manufacturing Company Lightning protection apparatus for a longitudinal member
WO2001086144A1 (en) * 2000-05-06 2001-11-15 Aloys Wobben Wind power installation
US6457943B1 (en) 1998-09-09 2002-10-01 Im Glasfiber A/S Lightning protection for wind turbine blade
WO2004001224A1 (en) * 2002-06-19 2003-12-31 Neg Micon A/S Lightning protection means for a wind turbine
EP1375913A1 (en) * 2002-06-28 2004-01-02 High Technology Investments B.V. Wind turbine with discoid generator
DE10259680A1 (en) * 2002-12-18 2004-07-01 Aloys Wobben Rotor blade of a wind turbine
WO2005026538A1 (en) * 2003-09-15 2005-03-24 Lm Glasfiber A/S A method of lightning-proofing a blade for a wind-energy plant
WO2005071262A1 (en) * 2004-01-23 2005-08-04 Lm Glasfiber A/S A method of manufacturing a blade for a wind turbine and blade comprising segmented conductor means
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US8358189B2 (en) 2009-08-07 2013-01-22 Willic S.Ar.L. Method and apparatus for activating an electric machine, and electric machine
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US8492919B2 (en) 2008-06-19 2013-07-23 Wilic S.Ar.L. Wind power generator equipped with a cooling system
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US8618689B2 (en) 2009-11-23 2013-12-31 Wilic S.Ar.L. Wind power turbine for generating electric energy
US8659867B2 (en) 2009-04-29 2014-02-25 Wilic S.A.R.L. Wind power system for generating electric energy
US8669685B2 (en) 2008-11-13 2014-03-11 Wilic S.Ar.L. Wind power turbine for producing electric energy
EP2708740A1 (en) * 2012-09-17 2014-03-19 Nordex Energy GmbH Wind energy assembly rotor blade with an electric heating device and a lightening conductor
EP2806160A1 (en) * 2013-05-23 2014-11-26 Nordex Energy GmbH Wind turbine rotor blade with an electric heating device and multiple lightning conductors
US8937397B2 (en) 2010-03-30 2015-01-20 Wilic S.A.R.L. Wind power turbine and method of removing a bearing from a wind power turbine
US8937398B2 (en) 2011-03-10 2015-01-20 Wilic S.Ar.L. Wind turbine rotary electric machine
US8957555B2 (en) 2011-03-10 2015-02-17 Wilic S.Ar.L. Wind turbine rotary electric machine
US8975770B2 (en) 2010-04-22 2015-03-10 Wilic S.Ar.L. Wind power turbine electric generator and wind power turbine equipped with an electric generator
EP2857678A1 (en) * 2013-10-03 2015-04-08 Gamesa Innovation & Technology, S.L. Lightning protection system with integrated anti-icing system for wind turbine blades
US9006918B2 (en) 2011-03-10 2015-04-14 Wilic S.A.R.L. Wind turbine
DK178375B1 (en) * 2015-01-29 2016-01-18 Wind Solutions As Kk Power supply for an electric component in a wind turbine blade
EP3447284A1 (en) 2017-08-24 2019-02-27 eno energy systems GmbH Rotor blade for a wind turbine, method for contacting an electrically conductive coating on a wind turbine rotor blade and wind turbine
EP3792487A1 (en) * 2019-09-16 2021-03-17 Siemens Gamesa Renewable Energy Innovation & Technology, S.L. Wind turbine blade lightning protection with active components
US11542916B2 (en) * 2020-01-08 2023-01-03 Siemens Gamesa Renewable Energy A/S Wind turbine blade with thermally conducting electrical insulation

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