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					                                               Amendment-I
                                       Specification No. STN-216/10




   Clause No.                           Existing                                     Amended as
    Page No.3.,      “Sales     Tax    Clearance     Certificate”      “Sales Tax Clearance Certificate”
 S.No.25 “Notice     For the Financial year 2007-2008.                 For the Financial year 2009-2010.
  Inviting Tender
      Details”
   Page No. 47 :     Vertical ducts and spacers shall be               Dovetail spacers are not applicable in
Clause No. 5.2 (d)   provided within each coil for HV & LV             case of wound core construction, since
    “Windings”       windings. Dovetail spacers shall be used in       it has a single coil.
                     between HV coils and they shall be fixed to       However, ducts shall be provided.
                     vertical ducts which are provided
                     between HV & LV.
   Page No. 47,      The no. of HV coil for HV winding is two          The no. of HV coil for HV winding is
5.2 (f) Windings &   numbers for stacked core and one for              one/multi coils for stacked core and
   Page No.49,       wound     core    /   amorphous        core       one for wound core /amorphous core
       5.6.1.6.      transformers.                                     transformers.
   Clearances.
   Page No.47        Dimensions of winding coils are very              Dimensions of winding coils are very
5.2. (h) Windings.   critical. Dimension tolerance for winding         critical. Dimension tolerance for winding
                     coils shall be within limits (+1% and no          coils shall be within limits (+5% and no
                     negative tolerance).                              negative tolerance).
                                                                       However,        the    specified  internal
                                                                       clearances shall be maintained as per
                                                                       the GTP.
   Page No.48        The insulating oil shall comply with              The insulating oil shall comply with
     5.3. Oil.       the requirements of relevant standards            the requirements of relevant standards
                     IS:335/1993. Total minimum oil volume is          IS:335/1993. Total minimum oil volume is
                     100 litres for copper wound                       90 litres for copper wound
                     135 litres for aluminium wound                    125 litres for aluminium wound
   Page No.50        During testing, if it is found that the actual    During testing, if it is found that the
 5.5. Penalty for    measured losses are more than values              actual measured losses are more than
 Excess Losses.      quoted by the bidder, penalty shall be            values quoted by the bidder, penalty
                     recovered from the bidder at double the           shall be recovered from the bidder at
                     loss capitalization formula as                    double the loss capitalization formula as
                     mentioned below.                                  mentioned below.
                     (a) No load losses Rs. 217.51 per watt or part    (a) No load losses Rs. 217.51 per watt or
                     there of excessive loss.                          part there of excessive loss.
                     (b) Load loss: Rs. 28.77 per watt or part there   (b) Load loss: Rs. 28.77 per watt or part
                     of excessive loss                                 there of excessive loss
                     For fraction of a KW, proportionate penalty       For fraction of a KW, proportionate
                     will be recovered.                                penalty will be recovered.
                                                                       For large variation in losses the
                                                                       purchase order is liable for cancellation.




                                                                                                 Contd..2
                                                      :: 2 ::
  Clause No.                             Existing                                    Amended as
  Page No.50          The transformer tank shall be of robust           The transformer tank shall be of robust
  5.7.1. Tank.        construction rectangular in shape and shall       construction rectangular in shape and
                      be built up of tested MS sheets of the            shall be built up of tested MS sheets
                      following thickness and no negative               with the tolerance applicable as per
                      tolerance is allowed.                             IS:1852.
                      i) Side walls (min) : 3.15 mm thickness.          i) Side walls (min) : 3.15 mm thickness.
                      ii)Top and bottom plates (min): 5.0 mm            ii)Top and bottom plates (min): 5.0 mm
                      thickness.                                        thickness.
                      iii)Bottom plates (Min.) :5 mm thickness.         iii)Bottom plates (Min.) :5 mm thickness.
  Page No.51          The transformer tank top cover shall be           The transformer tank top cover shall be
5.7.7. Anti theft     fixed with M12/M10 bolts (hot dip                 fixed with M12/M10 bolts (hot dip
      bolts           galvanized) spaced not more than 100              galvanized) spaced not more than 100
                      between each bolt. Four M12 anti theft SS         between each bolt. Four M12 anti theft
                      bolts (fasteners) shall be fixed with provision   SS bolts (fasteners) shall be fixed with
                      to put seals (2 mm hole on tail side) and         provision to put seals (2 mm hole on tail
                      four corner bolt-nuts shall be welded to          side) and four corner bolt-nuts shall be
                      prevent opening of the cover at site by           fixed to prevent opening of the cover
                      miscreant      and       suitable  continuous     at site by miscreant and suitable
                      neoprene gasket (Rectangular) to avoid            continuous         neoprene        gasket
                      leakage of Nitrogen/dry air and all the           (Rectangular) to avoid leakage of
                      fittings including bushings in position shall     Nitrogen/dry air and all the fittings
                      be tested for leakage at a pressure of            including bushings in position shall be
                      0.7Kg./Sq.cm inside the tank for 10 minutes.      tested for leakage at a pressure of
                      The above test shall be carried out before        0.7Kg./Sq.cm inside the tank for 10
                      final sealing of the transformers.                minutes. The above test shall be
                                                                        carried out before final sealing of the
                                                                        transformers.
  Page No.57          2 years guarantee embossed plate                  5 years guarantee embossed plate
5.1.3 (q) Fittings.   welded below name plate.                          welded below name plate.
  Page No.52          ‘U’ shaped pressure relief vent of 2”             ‘U’ shaped pressure relief vent of 2”
5.7.12. Para 2 of     diameter pipe with 0.025mm copper shim            diameter pipe with 0.025mm copper
   The Sealing        sheet as diaphragm shall be provided on           shim sheet / 0.4 mm Bakelite thick
        &             the top of the cover of the tank such that        sheet as diaphragm shall be provided
  Page No.57          the pressure released should be directed          on the top of the cover of the tank
  5.13. Fittings      to the ground. The vent shall be provided         such that the pressure released should
                      on opposite side of the circuit breaker           be directed to the ground. The vent
                      operating rod. The other end of the vent          shall be provided on opposite side of
                      pipe shall be guarded with wire mesh for          the circuit breaker operating rod. The
                      preventing the entry of worms and nesting.        other end of the vent pipe shall be
                      The diaphragm shall burst at a pressure of        guarded with wire mesh for preventing
                      0.76 to 0.95 kg/ sq.cm. Conservator shall         the entry of worms and nesting. The
                      not be provided for these transformers.           diaphragm shall burst at a pressure of
                                                                        0.76 to 0.95 kg/ sq.cm. Conservator
                                                                        shall not be provided for these
                                                                        transformers.
  Page No.58          The bidder may offer MCCB of appropriate          Only oil immersed LT Breakers of
   5.17. CSP          rating and good quality from reputed              reputed make only are allowed.
   Features.          manufacturer in the metal-box of the
                      distribution transformer instead of internal
                      LV breaker. It should be in the form of
                      metallic enclosure (metal box), housing the
                      LV bushing and MCCB (if provided) along
                      with the transformer. The metal box shall
                      have pad-lock arrangement & complete
                      protection from dirt, rain water & other
                      pollutants and shall comply to IP:53
                      protection or better. The transformer should
                      have facility to seal the transformers Top
                      Plate & its body and also the Metal box.
            All other terms and conditions of the tender specification remain unaltered.




                                                                                 Sd/-
                                                                   CHIEF GENERAL MANAGER /P&MM

				
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posted:10/4/2012
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