Offshore Switchgear

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    Medium Voltage Switchgears for Offshore

    Mario Haim

    R&D Director

    Medium Voltage Switchgears

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    Schneider Electric 2- Infrastructure Mario Haim 2012

    Barrow (12)

    Beatrice (6)

    Robin Rigg (24)

    Horns Rev 2 (14)

    Gunfleet

    Sands (10) Borkum West II (38)

    Thornton

    Banks (85)

    Alpha Ventus (28)

    Greater

    Gabbard

    (420)

    Walney I+II (20)

    Cote

    D'Albatre

    (16)

    Rdsand (16)

    Veja Mate (34)

    Ormonde (90)

    West of Duddon Sands (18)

    Global

    Tech (370)

    Baltic II (30)

    Riffgat (12)

    Dan Tysk (24)

    Meerwind (32)

    Nordsee Ost (145)

    OurOffshoreReferences

    With WS market leader in 5 MW offshore Windturbines With GHA market leader in offshore substations

    Moretha

    n1500p

    anelsoffsh

    ore

    inPrima

    ryapplica

    tions

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    Schneider Electric 3- Infrastructure Mario Haim 2012

    Offer for any MV offshore application

    GMA WS WI GHA

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    Schneider Electric 4- Infrastructure Mario Haim 2012

    Agenda

    Market trend

    Wind park layout & Short circuit level

    Requirements

    Overvoltages & Insulation coordinationPreferred Solution

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    Schneider Electric 5- Infrastructure Mario Haim 2012

    MainareasforWindOffshoreinEurope

    MorayFirth

    FirthofForfh

    DoggerBank

    Hornsea

    EastAnglia

    Hastings

    Isleof

    Wight

    BristolChannel

    IrishSea

    NorthSea

    BalticSea

    32GW25GW5GW

    LeTreportFecamp

    Courseuilles

    Saint

    Brieuc

    SaintNazaire

    6GW

    18GW10GW5GW

    6GW

    *Capacityto

    be

    intalled

    until

    2030

    *Capacitytobeintalleduntil2020

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    Carbon Trust

    Carbon Trust has brought together 8 offshore wind developers in ajoint

    industry project

    to work towards reducing the cost

    of offshore wind

    by at least 10% by 2015.

    DONG Energy

    EON,

    Mainstream Renewable Power,

    RWE Innogy,Scottish Power Renewables,

    SSE Renewables

    (formerly Airtricity),

    Statkraft,

    Statoil,

    http://www.carbontrust.com/our-clients/o/offshore-wind-accelerator

    http://www.carbontrust.com/our-clients/o/offshore-wind-acceleratorhttp://www.carbontrust.com/our-clients/o/offshore-wind-accelerator
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    Market trend

    Clear recommendation:

    Go to 66 kV system voltage intower to

    reduce costs

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    66 kV in tower + substation

    -tower switchgear at 66 kV-platform switchgear at 66 kV-transformer

    at 66 kV

    -cable at 66 kV

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    Agenda

    Market trend

    Wind park layout & Short circuit level

    Requirements

    Overvoltages & Insulation coordinationPreferred Solution

  • 7/30/2019 Offshore Switchgear

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    Source: http://www.carbontrust.com/our-clients/o/offshore-wind-accelerator

    http://www.carbontrust.com/our-clients/o/offshore-wind-acceleratorhttp://www.carbontrust.com/our-clients/o/offshore-wind-accelerator
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    Schneider Electric 11- Infrastructure Mario Haim 2012

    4 types of wind turbines

    Induction

    (asynchronous) generator

    Vestas

    (Neg

    Micon), Siemens (Bonus)

    Strong points:

    robust and simple

    Weak points: low efficiency (fixed speed), flicker, no

    control of reactive power

    Doubly-Fed induction generatorVestas, General Electric, Gamesa, Nordex

    Strong points: variable speed (wide range), control ofreactive power

    Weak points: produces harmonics (but only 25% of the

    power goes through the converter)

    Induction

    (asynchronous) generator

    with

    slip control

    Vestas

    (for

    US market), Gamesa (for

    US market), Suzlon

    Strong points:

    variable speed (limited range), low

    harmonics

    Weak points: low efficiency, no control of reactive power

    Variable speed induction or

    synchronous generatorEnercon, Multibrid,

    General Electric, Siemens, Clipper, Vestas

    Strong points: total variable speed, control of reactive

    power, fast answers to bad electrical conditions coming

    from the grid

    Weak points: expensive, huge size, produces harmonics

    (100% of the power goes through the converter)

    GENERATOR

    INDUCTIONCOUPLING

    CAPACITOR

    BANK

    G

    CAPACITORBANKR

    G

    INDUCTION

    COUPLING

    Control

    R

    L2L1

    CONVERTER

    DC BUS

    G

    L1 L2

    CONVERTER

    G

    8% of manufactured

    No converter

    Ageing technology

    20% of manufactured

    No converter

    Ageing technology

    42% of manufactured

    25% power throughconverter

    Main Onshore

    technology

    30% of manufactured100% power through

    converter

    Main offshore technology

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    Schneider Electric 12- Infrastructure Mario Haim 2012

    Wind park layout & grid model for 66 kV

    simulation

    Based on the defined network architecture the

    model was created

    For this model a static simulation (short circuit

    level) and dynamic simulation (transient recovery

    voltage) had been done

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    Schneider Electric 13- Infrastructure Mario Haim 2012

    Voltage / Power-Factor 33 kV vs. 66 kV

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    Schneider Electric 15- Infrastructure Mario Haim 2012

    Static network simulation: Short circuit

    level

    The thermic short circuit inside the 66 kV networkarchitecture can be between 11,33 kA and 18,04 kA & 29,07 kAp and 46,24 kAp peak value for short circuit

    Inside the tower the maximum thermal short circuit level is

    between 10,94 kA and 17,13 kA & the peak value between

    27,86 kAp and 43,17 kAp

    A 25 kA System at 66 kV is fully

    sufficient

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    Schneider Electric 16- Infrastructure Mario Haim 2012

    Agenda

    Market trend

    Wind park layout & Short circuit level

    Requirements

    Overvoltages

    & Insulation coordination

    Preferred Solution

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    Schneider Electric 17- Infrastructure Mario Haim 2012

    Key Requirements

    Cost efficientSafety EnvironmentReliability

    Offshore Wind Power

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    Schneider Electric 18- Infrastructure Mario Haim 2012

    General Service-Conditions for MV switchgear

    according to IEC 62271

    In principle indoor switchgear according IEC 62271-1

    Offshore Conditions exceeding the normal-conditions

    Standard -5.+40C, 24h average < 35C

    Ambient air not polluted with corrosive materials like salt etc.

    Relative 24h average humidity not exceeding 95%

    condensation occasionally

    Relative monthly average humidity not exceeding 90%

    Reliability

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    Schneider Electric 19- Infrastructure Mario Haim 2012

    Additional Challenges for the switchgear: Harsh environment

    saline atmosphere

    humidity

    Corrosion resistive

    Vibration due to operation of Windmill

    Low temperature operation without external power supply

    Operation starting at deep ambient temperature without any preload

    (cold start)

    Reliability

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    Schneider Electric 20- Infrastructure Mario Haim 2012

    Reliability

    Design responding to additional challenges

    Gas Insulated Switchgearwith

    Sealed Pressure System for Electrical active parts

    Hermetical closed gas tanks

    High-voltage parts are contained in a tightly sealed

    stainless steel tank

    Corrosion resistive components:

    Drive for devices

    Housing

    Connections

    LV-equipment

    Vibration withstand

    Vibration tests with dedicated frequencies

    Low temperature withstand

    Mechanical operations tests at low temperature

    Dielectric performance at low temperature

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    Schneider Electric 21- Infrastructure Mario Haim 2012

    Safety

    Optimum safety of operation due to a complete interlocking system

    Degree of protection: IP65

    for the primary part

    Personal safety due to Internal Arc withstand: IAC AFLR up to 40 kA

    Switchgear tested and certified

    according to IEC 62271

    Design responding to safety requirements

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    Schneider Electric 22- Infrastructure Mario Haim 2012

    Internal arc classification according IEC 62271-203

    Internal arc events could cause effects like

    pressure increase and burn through of enclosure

    (no effect on personnel is considered)