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    1

    Station Service System

    And DC equipments

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    2

    Outline1. Introduction

    2. Station service electrical supply

    3. DC equipment4. Conclusion

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    3

    IntroductionBasic Hydro Power Plant

    1. Main transformer

    2. Switchyard equipment3. Station service and DC equipment

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    4

    Lost the station service system Station service transformer got trouble.

    Transmission line tripped and generating

    units might be shutdown.

    Black out system

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    What is a problem ? Condition to start of unit is not available.

    Auxiliary equipments could not start up

    without AC power supply.

    Power plant is black.

    Station service system is necessary for HPPas much as water in the river or

    reservoir.

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    Station service electrical supply Auxiliary equipment works at 400-600 V.

    Lighting and low voltage equipment weresupplied by 120 / 240 V.

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    Station service system management Main Station

    Load Center or Motor Control Center(MCC) or Power distributing board

    Main Station

    Load Center 1 Load Center 2 Load Center 3

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    Electrical supply diagram

    Motor Pump Motor PumpMotor Compressor

    Power

    In

    BreakerDraw Out

    MCC Bus

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    Station service power supply Generator bus (11 kV)

    High voltage bus (115 kV or230 kV)

    Generator terminal and bus

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    Generator bus

    G1

    Gen. Bus 11 kV

    T2T1

    G2 G3

    Load 1 Load 3

    400 VSS Transformer

    Loads 2

    High volt bus115 or 230 kV

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    High voltage bus (230 kV or138 kV)T2T1

    G2G1

    Load 1 Load 3

    400 VSS

    Transformer

    Load 2

    High volt bus 115 or 230 kV

    G3

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    Generator terminal and bus

    G1

    High volt bus

    115 or 230 kV

    G2 G3

    T1 T2 T3

    SS A

    SS

    Transformer

    Load 1 Load 2 Load 3 Load 4

    SS B

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    More stability

    G1

    Gen. Bus 11 kV

    T2T1

    G2 G3

    DieselGenerator

    SS1

    115 or 230 kV

    Load 3 Load 5

    SS BSS2

    Load 4Load 1

    SS A

    Load 2

    Gen. Bus 11 kV

    52A 52B

    52C

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    CB interlocking

    DieselGenerator

    SS1

    Load 3 Load 5

    SS BSS2

    Load 4Load 1

    SS A

    Load 2

    52A 52B

    52C

    Tie CB

    52A I I 0 052B I 0 I 0Tie 0 I I I 052C 0 0 0 I

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    HPP station service systemBB-NS # 1

    A B

    KW1B

    13.8 kV/ 416

    1250 kVA 24A

    BB-NS # 2 BB-BB Sub BB-TA2

    52A 52B

    G2

    KG1A

    11kV / 115 kV

    Ring Bus (Loop)

    G1 G3 G4

    E1A

    MCC1

    E3A

    MCC3

    ...

    Diesel Generator

    225 kVA

    DG

    KW2B

    E2A

    MCC2

    E4A

    MCC4

    To U8 52C ...

    KG2A

    11kV / 115 kV

    KG5A

    11 kV / 115 kV

    52A 52B

    Electrical supply for equipment U8

    KW3BG8

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    DC Power Supply Annunciation / alarm

    Indicating lights on the main control panel

    Protection circuits Control circuit of CB

    Emergency lighting

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    17

    DC power supply level 110 Volt

    220 Volt

    48 Volt

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    Rectifier

    Battery

    Main equipment of DC system

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    Typical DC systemAux. Bus

    600 V AC

    125 V

    DC Distribution

    Bus

    Battery Bank

    RectifierDC

    Equipmen

    t

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    Rectifier

    Battery

    Inverter

    AC system

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    Off-Line UPS120 V AC 120V Safe AC

    Battery Bank

    Static Transfer SW.

    DC

    InverterRectifier

    AC

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    Off-Line UPS120 V AC 120V Safe AC

    Battery Bank

    Static Transfer SW.

    DC

    Inverter

    Rectifier

    AC

    Rectifier

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    24

    Conclusion Station service system in HPP must be

    more stabilization.

    Uninterruptible power supply is necessary

    for emergency system.

    There are 3 main equipments in safe

    DC/AC power supply are Rectifier,

    Battery and Inverter.


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