DHUKWAN SHP

  • Govt of UP has entrusted implementation of 24 MW Dhukwan Small Hydro Project to THDCIL. Project is located near village Sukhwan-Dhukwan in Tehsil Babina, in Jhansi district of Uttar Pradesh on river Betwa. Implementation agreement was signed between GOUP and THDCIL on 2nd Sep’09.

    Project is about 37 Km from Jhansi on Jhansi-Lalitpur road. The nearest rail head is Jhansi. The project site falls in the survey of India toposheet No. 54 K/12/NW and is connected with all weather metalled road. The geographical co-ordinates of the project site are latitude 250 12′ E and longitude 780 33′ N.
     
    The project is of 24 MW capacity, utilizing the storage of existing reservoir of Dhukwan masonry cum Earthen Dam.  The length of the Dam is 2972 m. The gross capacity of the existing reservoir is 5780 MCum with top F.S.L. 273.7 m.

    THDCIL has constructed 1433m long head race channel, 4nos of RCC Intake barrels, Forebay, Penstock three numbers of 4.0 m dia each, Surface Power house with three units of 8 MW capacity vertical Kaplan turbine and a 961m long Tail race Channel. Annual Energy Generation shall be 97.82 MU at 46.53% load factor (as per availability of water).

    The project does not involve any R&R works. Gazette Notification for 39 Ha. Forest land was issued on Jun-2014.

    THDCIL Board has been approved RCE amounting to  Rs. 294.60 Cr including IDC of  Rs. 19.04 Cr at Jul-16 PL.
     
    Commissioning:
     
    Unit-1-  Synchronized on 29.09.19
    Unit-2-  Synchronized on 02.12.19
    Unit-3-  Synchronized on 19.12.19
     
    Dhukwan Project that was awaiting clearance for commercial operation since its commissioning on 20.12.19 has finally been allowed to start generation and inject power to the grid by UPSLDC and UPPCL. After availability of water, Project has started commercial operation since evening of 05.05.2020 and running successfully as per water head available. PPA signed with UPPCL of Dhukwan Project has also been approved by Hon'ble UPERC during Online hearing held on 13.05.20. Capacity addition of 24 MW w.e.f. 13.01.2020 at 00:00 Hrs. has also been accepted by UPSLDC vide letter dtd. 13.05.2020
  • I.         GENERAL
    1.      LOCATION:
    State                                                   :           Uttar Pradesh
    District                                                 :           Jhansi
    Tehsil                                                   :           Babina
    Village                                                  :           Sukwan Dhukwan
    River                                                    :           Betwa
    Access                                                 :           30km from Jhansi through     road
    Nearest rail head (B.G.)                       :           Jhansi
    2.      GEOGRAPHICAL CO-ORDINATES:
    Latitude                                                :           25°12’E
    Longitude                                             :           78°33’N
    Reference Toposheet No.                    :           54 K/ 12/ NW
    3.      DAM  (Existing):
    (Existing Dhukwan Dam is 2972 m long Masonary cum Earth & Rockfill Dam across river Betwa.)
     
    Catchment Area                                   :           21, 34, 160 Ha
    Gross Capacity                                    :           5780 MCM
    Spillway Crest Level                            :           271.27 m
    F.S.L.                                                   :           273.70 m
    H.F.L.                                                   :           275.55 m
    Top Level                                             :           277.00 m
    Length of Masonry Dam                      :           1172 m
    Length of Earthen Dam                       :           1800 m
    Submergence Area                             :           1943 Ha.
    Maximum Height of Dam                    :           8.22 m
    No. & Size of Spillway Gates              :           383 no.  (10 ft wide & 8ft high)
    Design Discharge of Spillway             :           15, 260 cumecs
    4.      HYDROLOGY:
    Catchment Area at Dam Site              :           8240 sq. miles (21, 24, 160 Ha)
    Type of Catchment                             :           Rugged and hilly
    Rainfall                                              :            Dam is existing across river betwa and releases from reservoir are proposed to be passed through the Power House. The discharges of the river at dam site and releases from dam are available for the years 1990 to 2009.
    Maximum Flood Discharge               :             20,000 cumec (6.42 lacs cusecs observed in the year 1983). This is the maximum observed since 1961.
    Reservoir Capacity                            :            2.04 T.M.C.
     
    5.      RESERVOIR:
    F.R.L.                                                 :           E L   273.70 m
    MDDL                                                :           E L   268.30 m
    Minimum Tail Water Level                 :           E L   251.70 m
    HFL in D/S of TRC                            :           EL    258.50 m
    II.          PROJECT FEATURES
    1.      SUPPLY/ APPPROACH CHANNEL:
    Shape                                              :           Trapezoidal
    Bed width                                         :           24.00 m
    Bed Slope                                        :           Horizontal
    Bed level                                          :           264.50 m
    Length                                              :           540 m in existing reservoir
    Side Slope                                        :           1.5 H: 1.0 V
    2.      REINFORCED CEMENT CONCRETE BARRELS:
    Shape                                              :           Rectangular
    Size                                                 :           4.5 m (w) x 5.5 m (H)
    Bed Level                                        :           265.50 m
    Length                                             :           42 m
    No. of Barrels                                  :           4
    3.      HEAD RACE CHANNEL:
    Design Discharge                          :           160 cumec                          
    Shape                                            :           Trapezoidal
    Bed Width                                      :           6.00 m
    Bed Slope                                     :           1 in 4000
    Bed Level D/S of Barrels              :           265.50 m
    Length                                          :           1750 m
    Berm Level (1.0 m wide)              :           270.00 m
    Side Slope                                   :           1.0 H: 1.0 V upto  Berm Level
                                                                     1.5 H: 1.0 V above Berm Level
    Free Board                                  :           1.50 m
    Top Level                                     :           275.0 m
    Depth of Flow                              :           8.00 m      At intake
    FSL                                              :           273.50
    Lining Thickness                          :           100 mm (C.C. M-15)
    4.      FOREBAY :
    FSL in Forebay                            :           EL 273.00 m
    MDDL in Forebay                         :           EL 267.70 m
    Design Discharge                        :           160.00 cumec
    Free Board                                   :           1.50 m
    Material                                        :           Stone Masonary/ Cement Concrete
    Storage Capacity                         :           19200 cum
    Length of Forebay                       :           95.00 m
    Width of Forebay                         :           39.60 m
    Height                                          :           16.00 m
    Top Level of Forebay                   :           EL 274.50 m
    Bed Level near Penstock             :           EL 258.50 m
     
     
     
    5.      PENSTOCK:
    Shape                                           :           Circular
    Size (Dia.)                                    :           4000 mm
    Nos.                                              :           3
    Length                                          :           100.00 m
    Thickness                                     :           12 mm
    Material                                        :           Mild steel
    Design Discharge                        :           53.33 cumecs for each Penstock
    Intake Level at Forebay               :           258.50 m
    6.      POWER HOUSE:
    No. of Machines                          :           3
    Type of Machines                        :           Kaplan
    Power House                              :           Surface Power House
     
    Head                                          
    Gross (weighted)                         :           20.60 m
    Design                                         :           17.85 m
     
    Size of Power House             
    Length                                          :           64.0 m
    Width                                            :           24.0 m
    Deepest Foundation Level           :           240.40 m
    Top Level of Power House            :          277.00 m
    Level of Centre line of M/c           :           249.70 m
    Erection Bay Floor Level               :          261.5 m
    Installed Capacity                        :           3 x 8 MW
    7.      SPILLWAY AT FOREBAY:
    Crest Level of Spillway                :           269.80 m
    Design Discharge                        :           176 cumec
    Nos. of Gate                                :           2
    Pier Thickness                             :           2.0 m
    Size of Gate                                 :           9.5 m (W) X 3.2 m (H)
    8.      SPILL CHANNEL:
    Shape                                           :           Trapezoidal
    Length                                          :           280 m
    Width                                            :           21 m
    Design Discharge                         :           176 cumec
    Side Slope (H: V)                         :           1:1
    Bed level at D/S end                    :           258.00
    Bed Slope                                    :           1:320
    Water Depth                                 :           1.80 m
    9.      TAIL RACE CHANNEL:
    Length                                          :           650.0 m
    Shape                                           :           Trapezoidal
    Discharge                                     :           160.00 cumecs
    Bed Slope (S)                              :           1/1000
    Side Slope (H: V)                         :           1:1
    Bed Width                                    :           30 m
    Bed level at D/S end                    :           251.00 m
    Water Depth                                 :           2.1 m
    10. CROSS DRAINAGE WORKS:
    At Kappa Nala
     
    Nos. of Barrels                            :           4 Nos.
    Width of Barrels                           :           3.5 m
    Height of Barrels                         :           3.0 m
    Length of Barrels                         :           80 m each
    Bed Level of Barrels                    :           ± 258.50 m
    Materials                                      :           RCC (M-25)
     
    At Nala-1, 2 & 3
    Nos. of Barrels                            :           01
    Size                                             :           3.5 m (W) X 3.0 m (H)
    At  Nala-4
    Nos. of Barrels                            :           02
    Size                                             :           3.5 m (W) X 3.0 m (H) each
    11. HYDRO-MECHANICAL WORKS:
     
    i)    Barrel Gates
    a.   Type of Gate                                      Fixed wheel with upstream skin  plate and upstream seals.
    b.    No. of bays                                       4 (four)
    c.    Clear width                                        4.50 m
    d.    Clear height of gate                         5.50 m
    e.    Sill level                                              265.50 m
    f.     Maximum Water Level                     273.70 m (FRL)
    g.    Design head                                       8.2 m
    h.    Type of wheel assembly                   Wheel mounted on corrosion resisting Steel axle with
                                                                          roller bearings and having line contact with track.
    i.     Type of side and top seals                 Rubber, music note    (hollow).
    j.     Type of bottom seal                            Rubber, wedge
    k.    Lowering/raising speed of hoist        50 cm/minute
    l.     Centre to centre side seals                 4500+ 150 mm
    m.   Centre of the centre wheels/tracks    4500 + 400 mm
    n.    Approx weight of each gate                15 tonne
    o.    Approx hoist capacity for each gate   25 tonne
     
    ii)     Trashracks at Intake structure of Forebay
    a.      Type of trash rack                                 Inclined
    b.       No. of bays                                            9 (nine)
    c.       Clear width                                            3.4 m
    d.       Total vertical height of trash rack      16.2 m
    e.        Sill level                                                  258.50 m
    f.         Full supply level                                    273.00 m
    g.        HFL                                                          273.0 m
    h.        Differential head for design                6 m
    i.         Approx. weight of one section of        2.5 tonne
               Trash rack considering six (6)
               Sections per bay
                           
    iii) Intake Gates at Forebay
    a.       Type of Gate                                             Fixed wheel with downstream
               skin plate and downstream seals.
    b.        No. of bays                                              3 (three)
    c.        Clear width                                               3.32 m
    d.        Clear height of gate                                 6.30 m
    e.        Sill level                                                     258.50 m
    f.         Full Supply Level                                      273.00 m
    g.        Design head                                              14.5 m
    h.        Type of wheel assembly                          Wheel mounted on corrosion resisting Steel axle
                                                                                with roller bearings and having line contact with track.
    i.         Type of side seals                                      Teflon cladded, rubber, music note (solid).
    j.         Type of bottom seal                                  Rubber, wedge
    k.         Lowering/raising speed of hoist               50 cm/minute
    l.          Centre to centre side seals                        3320 + 150 mm
    m.        Centre of the centre wheels/tracks          3320 + 400 mm
    n.         Approx weight of each gate                       15 tonne
    o.         Approx hoist capacity for each gate          30 tonne
     
    iv)        Draft Tube Gates
    a.        Type of gate                                                Vertical lift, slide type   downstream skin plate
                 and downstream sealing, non regulating type                                                                 
    b.         No. of bays                                                 Six of clear width of 4.2 m each
    c.        No. of gates required                                 Two seal gates having bottom,  side & top
                                                                                      isolating one unit.
    d.        Total height of one gate                             3.20 m + requirement for top seal
    f.         Sill level                                                        244.0 m
    g.        Max. TWL                                                     258.00 m
    h.        Design head                                                14.00 m
    i.         Type of side & top seals                             Rubber, music note (hollow)
    j.         Type of bottom seal                                    Rubber, wedge
    k.         Lowering/raising speed of hoist               0.75 m/minute to 1.5 m/minute
    l.         Centre to centre side seals                        4200 + 150 mm
    m.       Centre to centre thrust pads                      4200 + 400 mm
    n.        Approx. weight of each gate                       8 tonne
     
    v) Automatic Tilting Gates at Spill Channel
    a.      Type of Gate                                                Fish belly with upstream skin plate Automatic with counter  weight
    b.       No. of bays                                                   2 (two)
    c.       Clear width                                                    9.5 m
    d.       Clear height of gate                                      3.2 m
    e.        Sill level                                                         269.80 m
    f.        Maximum Water Level                                 273.00 m (FRL)
    g.       Design head                                                   3.2 m
     
    12. ELECTRO-MECHANICAL WORKS:
    i)   Characteristic of Turbine
    a.         Type                                                    :          Kaplan (Vertical)
    b.         Nos.                                                     :          3
    c.         Runner dia.                                         :          2.7 mc.           
               Operating load range                         :         40% to 110%d.           
               Permissible speed rise                       :           Not more than 50 %e.
               Permissible pressure rise                  :           Not more than 40% of design headf. 
               Turbine efficiency                                :           92 %
               
    ii)     Characteristic of Generators
     
    a.       Type                                                         :          Three phase synchronous
    b.       Rated output at 0.9 pf lag and
              normal rated terminal voltage              :           8.88 MVA
    c.       Continuous overload capacity               :           10%
    d.       Normal rated terminal voltage             :           11 kV
    e.        Rotational speed                                    :           187.5 rpm
    f.         Rated frequency                                     :           50 Hz
    g.        Short circuit ratio on                           
               rated MVA base                                      :           1.0
    h.        Efficiency at 8.88 MVA,
               0.9 pf lag, 50 Hz, not less than             :           98%
     
    iii)   Characteristic of Generator Transformers
    a.     Type                                                          :           Three phase   
    b.      Rating                                                      :           9.78 MVA
    c.      Cooling type                                            :           ONAN/ONAF
      
    iv)   Switchyard
            Voltage level                                             :           11/132 kV
    a.     No. of bays                                               :           3
    b.     Size                                                            :           65 m (L) x 55 m (W)
     
    13. ANNUAL ENERGY GENERATION
    At 46.53% load factor                                      :           97.82 Million units
    (As per availability of water)
     
    14. COST ESTIMATES
    (i)     Total Cost                                                :           182.53 crores
    a)      Civil works                                              :           127.62 crores
    b)      E&M Works                                            :           54.91 crores
    (ii)      IDC                                                         :           12.89 crores
    (iii)     Subsidy                                                  :           11.70 crores
    (iv)     Total Cost considering                          :           183.72 Crores
               IDC and subsidy
    (v)      Cost of installation per MW                  :           7.65 crores
     
    15. GENERATION COST/kW
             At 46.53% load factor                              :           Rs. 3.63
           (As per availability of water)
     
    16. RETURN ON EQUITY (pre-tax)                 
    a.      For first 10 years                                       :           19 %
    b.      11th year onwards                                   :           24 %
    17. CONSTRUCTION PERIOD                          :           30 months    
     




Updated on : 05/08/2022