TECHNICAL SPECIFICATIONPOLE MOUNTED DISTRIBUTION TRANSFORMERS
INTRODUCTIONThis specification provides for the design,
manufacture, testing in factory, supply, delivery and off-loading
on site for Pole Mounted Distribution Transformers.It shall be
the responsibility of the Contractor to furnish equipment, which
shall meet in all respects the performance specification and will
have satisfactory durability for the prevailing site conditions.The
Contractor shall furnish all material and labour not herein
specifically mentioned or included, but which may be necessary to
complete any part of the work or work as whole, in compliance with
the requirements of this specification.The detailed design
arrangement of the equipment shall be the responsibility of the
Contractor subject to the approval of the Engineer. The design and
workmanship shall be in accordance with the best engineering
practices to ensure satisfactory performance throughout the service
life.The Pole Mounted Distribution Transformers supplied shall also
fully comply with the General Service and System Conditions
Standards and CodesExcept where modified, all equipment and
materials shall be in full accordance with IEC (International
Electrotechnical Commission) and ISO (International Standards
Organisation) standards and recommendations. If relevant IEC or ISO
standards and recommendations are not available in any case or
cases then relevant British Standards or National Standards shall
apply if available.When IEC, ISO, BSI or National Standards are
referred to the edition used shall
be that current at the date of Tender, together with
any amendment issued to that date.Further to that above
additional standards order of preference is listed below:
IECInternational Electrotechnical CommissionISOInternational
Standards Organisation BSIBritish StandardsNS National
Standards (where available) ANSI American National Standards
InstituteWhere the use of a standard other than IEC, ISO or BSI is
agreed then this standard shall be used, where applicable. Where
other standards are proposed in place of IEC, ISO or BSI Standards,
confirmation shall be provided that the provisions of the standards
are equivalent to or exceed those of the equivalent IEC, ISO or
BSI standards.Copies of any standards proposed in substitution
for IEC, ISO or BSI standards must be
submitted with the Tender accompanied where necessary by
English translations of the appropriate sections.
Notwithstanding any descriptions, drawings or illustrations which
may have been submitted with the Tender, all details other than
those shown in the 'Deviation from the Technical Specification
Schedule' and approved
by the Engineer shall be deemed to be in accordance with the Specification and the standard specifications and
codes referred to therein.No departures from the specification
except those shown in the 'Deviation from the Technical
Specification Schedule' and approved by the Engineer are to be made
without the written approval of the Engineer.The Pole Mounted
Distribution Transformers shall comply with the latest editions of
and amendments to, the standards/specifications listed below:
S.No.STANDARDTITLE1.IEC 60137Insulated bushings for AC Voltages
above 1 kV2.IEC 60076-1Power Transformers - General3.IEC
60076-2Temperature rise4.IEC 60076 - 3Insulation levels, dielectric
tests and external clearances in air5.IEC 60076 -5Ability to
withstand short6.IEC 60076 - 7Loading guide for oil immersed
transformers7.IEC 60296Specification for unused mineral insulating
oils for transformers and switchgear8.IEC 60076 - 10Determination
of transformer and reactor sound levels9.IEC 60437Radio
Interference Test on High Voltage Insulators10.IEC 296-1969, IEC
76Specification for power transformers11.IEC 296-1969Bushing for
alternating voltage above 1000V12.DIN 42531 to 33Specification for
Outdoor Bushings.13.ASTM D-1275Specification for fittings and
accessories for powertransformers14.IEC 76Guide for loading of oil
immersed Transformers15.BS 159:1957BS 3288 (Part-1):1960Electrical
power connector16.IEC 554Specification for Insulating Kraft
Paper17.IEC 641Specification for Insulating Press Board18.ASTM
B-233Specification for Al Wire rods19.ASTM D-1275Manual on
Transformer20.ASTM D-202Testing of Insulation Papers21.ISO
2063Metallic Coatings - Protection of Iron and Steel
againstCorrosionPRODUCT Design Types
of transformersThe transformers shall be three phase or single
phase units of the sealed tank type with oil immersed copper
windings and shall be naturally cooled (ONAN). They shall be
suitable for operation in outdoor exposed
locations.Performance characteristics RatingThe
following ratings are covered by this Specification:
THREE PHASE:33/0.400/0.230kV - 25kVA, 50 kVA, 100 kVA and 200
kVASINGLE PHASE: The single phase transformers shall be connected
on the primary side between two phases of 3-phase lines33kV/230
V-0-230 V - 10 kVA, 15 kVA, 25 kVA and 50 kVA Transformer
rated kVA shall be calc
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