f307155016 Ring Main Unit

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    RING MAIN UNIT

    Oleh

    RAIS BIN MAAT

    Ketua Program Kejuruteraan

    Elektrik

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    APA ITU RMU

    Satu pengasing (isolator) yang bolehmenyambung dan memutuskan bekalan

    11kV secara manual sahaja

    Sebahagian daripada sistem gegelang sistempembahagian 11kV

    Jenis minyak dipanggil OLU (Oil Link

    Unit) dan HFU (High Fuse Unit) Jenis gas menggunakan gas SF6

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    SUBSTATION

    RMUTxMSBGEN

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    C.BREAKER

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    RMU 11KVRating Unit 500

    kVA

    1000

    kVARated voltage kV 12 12

    Withstand voltage 1 minute kV rms 28 28

    Impulse withstand voltage kV 75 75

    Frequency Hz 50 50

    Load Break Switch nos 2 2

    Rated current disconnector A 630 630

    Fuse switch nos 1 1Rated current A 200 200

    Fuse rating A 63 80

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    VOLTAGE RATING

    12 kV

    17.5kV 24kV

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    CURRENT RATINGS

    400A

    630A

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    L.V BOARD

    Rating Unit 500kVA 1000kVA

    Rated current A 800 1600

    Rated voltage V 1000 1000

    Incoming disconnector A 800 1600

    Outgoing Fuseway at 20 C A 400 400

    Outgoing fuse rating A 160 160

    C.T ratio (class 0.2) 800/5A 1600/5A

    MD meter nos 3 3

    P.F meter nos 1 1

    kWh meter nos 1 1

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    ENCLOSURE

    Internal Arc testing IEC 1330

    Clause 6

    18.4 kA 1 sec

    Temperature rise test IEC

    1330 Clause 4.1

    Class 10 enclosure

    Index Protection (IP) IP 35

    Sound Level test 60 dBA

    Material/Thickness Electro Galvanised

    sheet/3.0mm

    Base Frame Hot dipped Galvanised C-

    Channel

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    VOLTAGE INDICATOR

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