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Transcript
Annex (A) Technical Specifications for Distribution Transformers PART 1: GENERAL 1. Scope This specification covers the design, manufacturing, testing, supply, delivery and performance requirements of three phase 11/0.416 kV outdoor type distribution transformers for use in the electricity distribution networks of Iraq. 2. Standards The equipment shall comply with the latest editions and amendments of the international standards listed below as a minimum. IEC International Electrotechnical Commission: IEC 60071: Insulation co-ordination IEC 60076: Power transformers IEC 60137: Bushing for alternating voltages above 1,000V IEC 60156: Method for the determination of the electric strength of insulting oils IEC 60296: Specification for unused mineral insulating oils for transformer and switchgear IEC 60354: Loading guide for oil-immersed power transformers IEC 60437: Radio interference test on high-voltage insulators IEC 60551: Determination of transformer and reactor sound levels IEC 60616: Terminal and tapping markings for power transformers IEC 60722: Guide to the lightning impulse and switching impulse testing of power transformers and reactors ISO International Organization for Standardization: ISO 1459: Metallic coatings - Protection against Corrosion by Hot Dip Galvanising - Guiding Principles ISO 1460: Metallic coatings - Hot dip galvanized coatings on ferrous materials. Gravimetric determination of the mass per unit area ISO 2178: Non-magnetic coatings on magnetic substrates Measurements of coating thickness - Magnetic method ISO 9000: Quality management and quality assurance standards Guidelines for selection and use CENELEC/CEN Harmonized European Standards: HD 428: Distribution Transformers ASTM American Society for Testing and Materials: D 202: Methods of sampling and testing untreated paper used for electrical insulation. Where any provision of this specification differs from those of the standards listed above, the provision of this specification shall apply. In case of conflict, the order of precedence shall be: This specification IEC standards ISO standards Other standards Equipment confirming to alternative standards may be accepted provided it is demonstrated that they give a degree of quality and performance equivalent or better than that of the reference standards. Acceptability of any alternative standard is at the discretion of the Employer. 3. Service Conditions Transformers will be installed outdoors, at ambient conditions given below. 3.1 Outdoor Item Altitude above sea level: Ambient Temperature: Maximum outdoor - shade Minimum outdoor Maximum outdoor daily average Maximum outdoor yearly average Maximum ground at depth 1 m Maximum Black Body (black objects in direct sun) Relative Humidity: Maximum Minimum Yearly Average Maximum wind velocity: Rainfall per year: Maximum Minimum Maximum in one day Yearly Average Description Up to 1,000m above sea-level +55 °C for 6 hours a day -10 °C +40 °C +30 °C +35 C +80 C 92 % 12 % 44 % 140 kilometre per hour 500 mm 50 mm 65 mm 150 mm Subject to sand storms and Atmosphere: wind blown dust Average number of days per year of dust storms 30 Average number of days per year of thunder storms 15 4. System Conditions The network design information is as follows; Voltage Description Nominal Voltage Highest System Voltage Number of Phases Frequency Neutral Point 3 Phase Short Circuit Level Duration of Short Circuit Insulation Levels: Impulse Power Frequency 1 min 11 kV 11 kV 12 kV 3 50 Hz See Note below 25 kA 1 sec 400 V 400/230 V 416 V 3 50 Hz Directly Earthed 10 kA - 75 kV 28 kV 3 kV Note: The 11 kV networks are normally operated with the neutral point earthed through a resistor to limit earth fault current. However, the 11 kV networks may also be operated with the neutral isolated from earth during abnormal conditions. The unearthed 11 kV equipment shall be suitable for continuous operation with an earth fault on one phase and shall be designed to withstand the over voltage that may occur due to arcing to earth. 5. Inspection, Testing and Quality Assurance 5.1 Inspection The Contractor shall submit a detailed program covering the design, manufacture and testing of the Distribution Transformers within one month of receipt of the contract award. Reports shall subsequently be submitted at intervals, outlining progress. The Employer or its nominated entity shall have free entry at all times, while work on the contract is being performed, to all parts of the manufacturer’s works which concern the processing of the work. The manufacturer shall afford the Employer without charge, all reasonable facilities to verify that the equipment being furnished is in accordance with this specification. 5.2 Testing The equipment shall have been type tested and successfully passed all type tests referred to in Part 2 “Technical”, and in the most recent editions of the standards referenced in Clause 2. Certificates of type tests already carried out shall be submitted with the bid for evaluation. Fresh type tests shall be carried out if required by the Employer at an independent certified/accredited testing laboratory and witnessed by the Employer or some other representative acceptable to the Employer. If the Employer wishes to witness tests, then the Contractor shall give the Employer a minimum of one-month notice that the equipment/material is ready for testing. If the Employer does not indicate an intention to participate in the testing, the manufacturer shall carry out the tests and the Contractor shall furnish the results thereof to the Employer for review and acceptance. Cost of type tests shall be included in the Price Schedule. All routine tests required by the relevant standards shall be carried out even though they are not listed in this specification, at the expense of the Contractor and these tests shall be carried out at the manufacturer’s works. The Contractor shall submit full details of the proposed methods of testing, including connection diagrams to the Employer for approval, at least one month before testing. The Contractor shall submit to the Employer five signed copies of the test certificates, giving results of the prescribed tests. Equipment shall not be dispatched until the Employer has received the test certificates and the Contractor has been informed that they are acceptable. The Employer reserves the right to reject any item of the equipment if the test results do not comply with the values specified or with the data given in the Schedule of Technical Data. 5.3 Quality Assurance The manufacturer must operate a quality assurance system that complies with ISO 9000. The Contractor shall provide current certification showing the manufacturers’ compliance with ISO 9000 or equivalent national standard. The certificate must have been issued by an independent, accredited issuing authority. 6. Spare Parts Not required. 7. Packing, Shipping and Hazardous Substances 7.1 Packing All equipment, including accessories, shall be packed and securely clamped against movement in robust, non-returnable packing cases to ensure safe transit from the manufacturer's works to the agreed point of delivery. The base of the packing case shall be strong enough to carry the weight of the transformer and be large enough so that no part of the transformer and accessories such as pipes, valves, etc extends beyond the edge of the pallet. Transformers shall be supplied filled with oil. The weight and volume of oil in the transformer shall be clearly stated. All the spare parts shall be packed for long storage. Internal surfaces of equipment and accessories shall be sealed off by means of gaskets and blanking off plates. Equipment and surfaces liable to deterioration due to condensation shall be protected by packs of silica gel or other approved desiccant. Each transformer shall have 2 suitable plywood labels tied to it on adjacent sides. Each label shall contain the following information indelibly marked on it: Individual serial number Employer’s name Contract number Contractor's name Manufacturer’s name Description of contents Country of origin Case measurements Gross and net weights in kilograms All necessary slinging and stacking instructions The label and ties shall be fixed such that no damage or abrasion is caused to the paintwork. Each transformer shall contain a fully detailed packing list in a sealed waterproof envelope robustly attached to it. Five (5) copies of each packing list shall be sent to the Employer prior to dispatching the equipment. 7.2 Hazardous Substances The Contractor shall submit safety data sheets for all hazardous substances used with the equipment. These substances shall be classified in accordance with the European Union SI 426. If such substances are not used in with the equipment, the Contractor shall give an assurance that there are no substances classified as hazardous in the equipment supplied. 8. Submittals Required by Employer after Contract Award The Contractor shall submit a detailed programme covering the manufacture, testing and delivery of the materials and equipment within the time stated in the following table. # 1. 2. Description Programme for production and testing Detailed dimension drawings for all components, general arrangement drawings showing detailed component layout and overall assembly drawings Delivery Time Objective Within one month Approval of contract award No. of Copies 3 # 3. 4. Description Progress reports 6. Notification of inspection and tests 8. 9. 10. 11. 12. 13. Objective No. of Copies Detailed drawing of mounting arrangements Certificates of compliance and certificates of origin 5. 7. Delivery Time List of tests and description of the tests to be performed Test reports for all type tests, routine tests and special tests and inspection reports Technical Data Schedule with approved revisions if any Detailed schematic and wiring drawings for all components General description of the equipment and all components including brochures Installation and commissioning instructions Operation and maintenance instructions manual At agreed intervals Monitoring Review and One month before necessary action inspection / testing Approval Immediately after tests/inspection are completed Approval 3 3 3 5 5 5 One month before Approval delivery 5 5 5 The programme for production and testing should be in the form of a Gantt chart. The Contractor shall submit progress reports detailing progress against this programme and explaining any variations. The progress reports shall be submitted at defined intervals agreed by the Employer. At each of the approval stages indicated in above table, the Contractor should not proceed to the next step in the programme until the Employer gives approval. PART 2: TECHNICAL 9. General This specification covers the design, manufacturing, testing, supply, delivery and performance requirements of three phase, 50 Hz, 11/0.416 kV distribution power transformers with accessories. All transformers shall have separate primary and secondary windings and be hermetically sealed, oil immersed with natural oil and air cooling (ONAN). The design of the tank, fittings, bushings, etc. shall be such that it will not be necessary to keep the transformer energized to prevent deterioration as the transformers may be held in reserve, outdoors, for many years. 10. Technical Requirements Description Rated Voltage 10.1 Requirement HV 11 kV LV 416 V Frequency 50 Hz Number of Phases 3 Power ratings 100kVA, 250 kVA, 400 kVA and 630 kVA Type Oil immersed, hermetically sealed (bolted type) Standard IEC 60076 Cooling Self-cooled (ONAN) Voltage Variation Off-load tap changer with 5 positions in the HV winding giving + 2 x 2.5 %. Windings Copper only Core Grain orientated silicon steel, step-lap mitered joints HV and LV Bushings Outdoor type Vector Group Dyn11 Rated Power The continuous rating of the distribution Transformers shall be 100kVA, 250 kVA, 400 kVA and 630 kVA. Each Transformer shall be capable of supplying its rated power being the product of rated voltage and rated current on the line side winding (at center tap) expressed in kVA, as defined in IEC 60076-1. The transformer shall also be capable of delivering rated current at an applied voltage equal to 105% of the rated voltage. - 10.2 Likewise, each transformer shall be capable of supplying its rated power continuously under ambient temperature conditions without the temperature rise of the top oil exceeding 50 C and without the temperature rise of the windings as measured by resistance exceeding 55 C. Overload Capacity The transformer shall be capable of operating in accordance with the loading guidelines of IEC 60354 without exceeding the normal daily use of life and without the transformer winding hot spot temperature exceeding 140 C. The Contractor shall submit calculations demonstrating that above requirements are met. These calculations shall disregard the effect of winding thermal capacity. Importance is attached to overload capacity. Transformers incapable of meeting the overload performance specified will not be considered. 10.3 Impedance Voltage The guaranteed value of impedance measured at 75 C and center tap shall be 4% for the transformers of 100kVA, 250 kVA and 400 kVA capacities and 6% for the distribution transformers of 630 kVA capacity and it shall be subject to the tolerance specified in IEC 60076. The resistance component of impedance measured at 75 C on the center tap shall not exceed 25 % for all kVA ratings 10.4 Short Circuit Performance The transformer shall be capable of withstanding the thermal and dynamic effects of short circuits. System short circuit level and the withstanding duration are given in table “system conditions” in section 3.2. The short circuit characteristics shall be as follows; The X/R ratio shall conform to HD 398 / HD 428 The initial winding hot spot temperature shall be 98 C The final winding hot spot temperature shall be 250 C The ability to withstand the thermal and dynamic effects of a short circuit shall be demonstrated in accordance with IEC 60076 and IEC 60354. Calculations / test certificates shall be submitted for approval. 10.5 Flux Density The flux density at any point of the magnetic circuit when the transformer is connected on the centre tap and operating at normal voltage and frequency shall not exceed 1.65 Tesla. Saturation must not occur at 10 % over voltage. 10.6 Noise Level The average noise level of the transformers shall not exceed the values given in IEC 60551. The measurements shall be carried out in accordance with the above standard at a distance of 300 mm from the envelope of the transformer. 10.7 Tap Changing Characteristics Each transformer shall be fitted with 5 taps with ± 2x2.5% voltage variation. Tap changing and the tap changing mechanism shall have the following characteristics: 11. 11.1 Tap changing shall be carried out with the transformer off-load. An externally operated self-positioning tapping switch shall be provided. Provision shall be made for locking the tap switch handle with a padlock having a 6 mm diameter hasp. Tap changer handles shall be fitted with gasketed covers, so that sealing of the transformer under normal conditions is independent of the switch shaft gland. Materials and Construction Core and Coils The HV and LV windings shall be made of high conductivity copper. Copper foil may be used for the LV winding. The windings shall be uniformly insulated and the LV neutral point shall be insulated for full voltage. The insulation material of windings and connections shall be high quality, free from insulation softening, shrinking or collapsing during service. Moreover none of the material used shall disintegrate, carbonize or become brittle under the action of hot oil, under all load conditions. The core shall be manufactured from non-aging, grain-orientated silicon steel of high permeability with step-lap mitered joints. The core and coil assembly shall have the core and coils rigidly connected to the tank and suitable closed lugs shall be provided for removing the core and coil assembly from the tank. 11.2 Bushings and Terminals All bushings shall be so designed that there will be no excessive stressing of any parts due to temperature changes and adequate means shall be provided to accommodate conductor expansion. Insulation levels for bushings shall be at least equal to those specified for the windings. The Bushings shall be so installed that they are easy to be checked and removed without removing the tank cover and the pipe work. The creepage distances for the bushings and the insulators shall not be less than 25 mm/kV for maximum phase to phase system voltage. Both HV and LV Bushings shall be complete with Brass terminals suitable for terminating Copper conductors as details given below: HV: outdoor bushings with clamp for terminating 50-95 mm2 Copper Conductor LV: outdoor bushings with terminals suitable for terminating copper cables as specified below. 100 kVA – 1x1C 95 mm2 250 kVA – 2x1C 95 mm2 400 kVA – 3x1C 150 mm2 630 kVA – 4x1C 150 mm2 The HV and LV bushings shall be: Easily replaceable and cemented in bushings are not acceptable. Sufficiently robust to withstand normal transport hazards. The HV bushings shall be labeled in accordance with IEC 60076. Letters shall be at least 12 mm high. The means of marking shall be either: 11.3 Engraved metal plate or etched anodized aluminium. Identification by adhesive stickers is not acceptable. If labeling is to be carried out on the tank, it is preferred that one plate be used rather than individual markings for each phase, in order to prevent incorrect phase markings. Earthing Terminals All transformers shall be provided with a main earthing terminal of stainless steel welded to the tank and be fitted with a stainless steel M12 bolt, nut, spring washer and a lock washer. 11.4 Tank Fabrication The transformer tank shall be of rigid construction, shall not leak and shall be designed so that the completed transformer can be lifted and transported without permanent deformation or oil leakage. The Contractor shall state what method of leak testing is used. The tank shall be fabricated of mild steel or stainless steel. If stainless steel is used it shall not discolour or corrode; a minimum grade 304 L is required. The minimum thickness of the steel tank shall be 3 mm for mild steel and an equivalent thickness for stainless steel such that its mechanical strength shall be the same as that of the 3 mm thick mild steel tank. Thickness below the minimum value will be considered only in exceptional cases, such as where special protective finishes are used. The Contractor shall provide full information about any such special finish, including any field experience. The transformer tank and the top cover shall be designed in such a manner as to leave no external pockets in which water can lodge or dust deposits can build up. The top cover shall be of the bolted type and fitted with neoprene bonded cork seals suitable for temperature as stipulated in this specification. Surfaces at gasketed joints shall be such that an even face is presented to the gasket, thereby eliminating the necessity for the gasket to take up surface irregularities. The cooling surfaces may be oil filled fins or radiators. Only larger faces of the transformer shall be used to attach cooling surfaces. All pipes and radiators, which are welded to the tank wall, shall be welded externally. 100kVA, 250 kVA and 400 kVA transformers shall be pole mounted and 630 kVA transformers shall be wheel mounted. Skids shall be aligned at right angles to the line of the HV bushings. 11.5 Surface Treatment The transformer tank, radiators and accessories should be adequately protected against corrosion and the Contractor shall submit details of the proposed method of protection. All surfaces shall be thoroughly cleaned of rust, scale, grease and dirt and other foreign matter and all imperfections shall be removed by means of approved methods. The transformer tank and its steel attachments shall be hot dip galvanized or metallized, followed by painting. The painting system used should be proven and documented. The outside of the tank shall be painted Gray. The inside of the tank shall be painted with an approved oil resisting varnish so that the oil cannot come into contact with the tank metal at any time. 11.6 Tank Fittings and Attachments The following fittings and attachments shall be provided in all transformers: 11.7 Tap changer (off-circuit with pad lockable switch) HV bushing assembly LV bushings assembly Oil filling and drain valves Main earthing terminal Lifting eyes pulling eyes and jacking pads Stainless steel engraved rating and connection plate in both Arabic and English languages Pressure relief valve Protecting irons Oil level indicator Terminal marking Transformer Assembly The core and winding shall be dried in a vacuum drying oven. The heating and vacuum drying cycle shall be approved by the Employer. The tank, complete with core and windings, shall be filled with oil under a vacuum. 11.8 Transformer Oil The transformers shall be supplied filled with class 1 mineral oil conforming to IEC 60296. The Contractor shall submit a detailed specification for the type of oil proposed. The oil shall not contain polychlorinated biphenyls (PCB). The Employer may require evidence that the oil is not contaminated by PCB. If an anti oxidant is recommended, its use shall be subject to the Employer's approval. 12. Transformer Losses The Contractor shall state the guaranteed losses. No positive tolerance is allowable on the guaranteed values. Transformers supplied with losses exceeding the guaranteed values will be rejected. The Contractor shall also state the value of guaranteed magnetizing current, subject to the tolerance specified in IEC 60076. 12.1 Loss Evaluation The admissible tolerances for component and total losses of transformer after testing shall be according to IEC 60076. The Employer may at its sole discretion reject any transformer with Copper losses or Iron losses exceeding the relevant tolerances. For the purpose of evaluation the transformer shall be evaluated according to the total price plus the capitalized value of losses. The formula to be used in evaluation will be: Capitalized Cost = $T + (Fe x $5,000) + (Cu x $1,200) Where, $T = The total cost of the transformer as tendered. Fe = No load loss in kW Cu = Load loss in kW at full rated load and maximum operating temperature. 13. Tests The tests listed hereinafter shall be carried out in accordance with provisions in the referenced standards in the specification. 13.1 Routine Tests Routine tests shall be carried out on all transformers and the tests shall be conducted in accordance with IEC 60076 /other standards as applicable. The following routine measurements and tests shall be carried out: 13.2 Measurement of winding resistance Measurement of voltage ratio and check of polarity and vector group Measurement of impedance voltages Measurement of load losses Measurement of no load losses and no load current, including measurement of harmonics Induced overvoltage withstand test Separate source voltage-withstand tests on HV and LV windings Bushing routine tests Oil leakage test Relief Device test Dielectric Routine Tests Galvanizing tests. Type Tests Following shall be regarded as type tests: Temperature Rise Test. This test shall be carried out on the tap having maximum losses Short Circuit Withstand test Measurement of zero-sequence Impedances Impulse Voltage Test and Power Frequency Test Acoustic Sound Level Measurement 13.3 Tank Vacuum Test Measurement of Harmonic Level in no load condition Oil Analysis Galvanizing Tests Galvanizing tests shall be carried out on transformer tanks prior to painting. Those shall be routine tests, which shall be part of the routine tests documentation and shall not be charged to the Employer. Testing shall be in accordance with ISO 1460 and is summarized as follows. The following tests, measurements or inspections shall be carried out on each of the selected samples: Visual inspection Thickness of galvanizing coat Uniformity of galvanizing coat In the event of disagreement or dispute over the results of the above tests a coating mass test shall be carried out. The result of this test shall be definite and binding. 14. Label and Rating Plates Labels, name plates, markings and instructions shall be clear and indelible and in the English language. A weatherproof rating plate shall be provided in accordance with IEC 60076 and showing the following items, indelibly marked: - Type of transformer Specification to which standard it was manufactured Manufacturer’s name Serial number Year of manufacturer Number of phases Rated power Rated frequency Rated voltage Rated currents Vector group Percentage impedance voltage at rated current Type of cooling Continuous ambient temperature at which ratings apply Top oil temperature rise at rated load Total weight Volume of oil Weight of core and windings 15. - Table of primary voltages at the 5 tapping positions - Employer’s name Connection diagram Drawings Typical mounting arrangement of pole-mounted transformers is shown in the following drawings. 15.1 100kVA - 250 kVA Transformer 15.2 400 kVA Transformer SCHEDULES TO BE COMPLETED BY THE BIDDERS 1. Technical Data Schedule The following Technical Schedule shall be filled out separately for each transformer rating. 1.1 Technical Data Schedule for 100 kVA Distribution Transformer # Description Unit 1 2 International standards transformer complies with Nominal frequency 3 Rated Power 4 Nominal primary voltage kV 5 Nominal secondary voltage V 6 Rated primary voltage kV 7 Rated secondary voltage V 8 Type of cooling 9 Vector group - 10 Tap changing 11 Hz kVA Number of steps ± steps Tapping range ±% Current kA Duration s 12 Rated short circuit current and withstanding duration 13 Impedance measured at 75 C and center tap % 14 X/R ratio 25 % overload 15 Duration of overload 50% overload C minutes C minutes 16 Design maximum outdoor temperature C 17 Design continuous ambient temperature C 18 Thermal Characteristics Average winding temperature rise C Maximum average temperature rise C Maximum hot spot temperature rise C Hot-spot to top-oil temperature gradient 19 20 21 22 23 24 Magnetic flux density Core Losses Winding losses No load current Regulation: full load, PF=1 full load, PF=0.85 Manufacturer Silicon steel Type and grade C Tesla W W A % % Data # Description Operating flux density Losses kW/kg at operating flux density Manufacturer’s data sheet supplied # Description 25 Unit Tesla kW/kg Yes/No Data Unit Data Manufacturer/Supplier and type Conductor for HV winding Conductor Material Shape and cross sectional area 26 Manufacturer/Supplier and type Conductor for LV winding Conductor Material Shape and cross sectional area 27 Manufacturer/Supplier HV Bushing Type and grade Bushing catalogue number 28 Manufacturer/Supplier LV Bushing Type and grade Bushing catalogue number 29 30 Bushing basic impulse level Bushing power frequency withstand voltage 31 HV Bushing kV HV Bushing kV LV Bushing kV Type and metal used in HV terminal Terminals Type and metal used in LV terminal Type of metal used in Earth terminal 32 Minimum phase to phase clearance mm 33 Minimum phase to earth clearance mm 34 Spring and lock washers included Yes/No 35 Manufacturer/supplier Tap changer 36 37 Catalogue details attached Yes/No Manufacturers data sheet attached Yes/No Can tap changer switch be locked Tank material Tank Fabrication 38 Tank Dimensions 39 Type Transformer weights Yes/No Thickness of the metal sheet Painting method details attached Width Height Depth Weight of core and windings Yes/No mm mm mm kg Weight of tank kg Weight of oil at 20 C Total weight of transformer, ready for service Shipping weight of transformer Signature: ______________ Company Seal kg kg kg Date: 1.2 Technical Data Schedule for 250 kVA Distribution Transformer # Description Unit 1 2 International standards transformer complies with Nominal frequency 3 Rated Power 4 Nominal primary voltage kV 5 Nominal secondary voltage V 6 Rated primary voltage kV 7 Rated secondary voltage V 8 Type of cooling - 9 Vector group - 10 Tap changing 11 Hz kVA Number of steps ± steps Tapping range ±% Current kA Duration s 12 Rated short circuit current and withstanding duration 13 Impedance measured at 75 C and center tap % 14 X/R ratio 25 % overload 15 Duration of overload 50% overload C minutes C minutes 16 Design maximum outdoor temperature C 17 Design continuous ambient temperature C 18 Thermal Characteristics Average winding temperature rise C Maximum average temperature rise C Maximum hot spot temperature rise C Hot-spot to top-oil temperature gradient 19 20 21 22 23 24 Magnetic flux density Core Losses Winding losses No load current Regulation: full load, PF=1 full load, PF=0.85 Manufacturer Type and grade Operating flux density Silicon steel Losses kW/kg at operating flux density Manufacturer’s data sheet supplied C Tesla W W A % % Tesla kW/kg Yes/No Data # Description 25 Unit Manufacturer/Supplier and type Conductor for HV winding Conductor Material Shape and cross sectional area 26 Manufacturer/Supplier and type Conductor for LV winding Conductor Material Shape and cross sectional area 27 Manufacturer/Supplier HV Bushing Type and grade Bushing catalogue number 28 Manufacturer/Supplier LV Bushing Type and grade Bushing catalogue number 29 30 Bushing basic impulse level Bushing power frequency withstand voltage 31 HV Bushing kV HV Bushing kV LV Bushing kV Type and metal used in HV terminal Terminals Type and metal used in LV terminal Type of metal used in Earth terminal 32 Minimum phase to phase clearance mm 33 Minimum phase to earth clearance mm 34 Spring and lock washers included Yes/No 35 Manufacturer/supplier Tap changer 36 37 Type Catalogue details attached Yes/No Manufacturers data sheet attached Yes/No Can tap changer switch be locked Tank material Tank Fabrication 38 Tank Dimensions 39 Transformer weights Yes/No Thickness of the metal sheet Painting method details attached Width Height Depth Weight of core and windings Weight of tank Weight of oil at 20 C Total weight of transformer, ready for service Yes/No mm mm mm kg kg kg kg Data Shipping weight of transformer kg Signature: ___________________ Company Seal 1.3 Technical Data Schedule for 400 kVA Distribution Transformer # Description Unit 1 2 International standards transformer complies with Nominal frequency 3 Rated Power 4 Nominal primary voltage kV 5 Nominal secondary voltage V 6 Rated primary voltage kV 7 Rated secondary voltage V 8 Type of cooling 9 Vector group - 10 Tap changing 11 Hz kVA Number of steps ± steps Tapping range ±% Current kA Duration s 12 Rated short circuit current and withstanding duration 13 Impedance measured at 75 C and center tap % 14 X/R ratio 25 % overload 15 Duration of overload 50% overload C minutes C minutes 16 Design maximum outdoor temperature C 17 Design continuous ambient temperature C 18 Thermal Characteristics Average winding temperature rise C Maximum average temperature rise C Maximum hot spot temperature rise C Hot-spot to top-oil temperature gradient 19 20 21 22 23 24 Magnetic flux density Core Losses Winding losses No load current Regulation: full load, PF=1 full load, PF=0.85 Manufacturer Type and grade Silicon steel Operating flux density Losses kW/kg at operating flux density C Tesla W W A % % Tesla kW/kg Data # Description Manufacturer’s data sheet supplied # Description 25 Unit Yes/No Data Unit Data Manufacturer/Supplier and type Conductor for HV winding Conductor Material Shape and cross sectional area 26 Manufacturer/Supplier and type Conductor for LV winding Conductor Material Shape and cross sectional area 27 Manufacturer/Supplier HV Bushing Type and grade Bushing catalogue number 28 Manufacturer/Supplier LV Bushing Type and grade Bushing catalogue number 29 30 Bushing basic impulse level Bushing power frequency withstand voltage 31 HV Bushing kV HV Bushing kV LV Bushing kV Type and metal used in HV terminal Terminals Type and metal used in LV terminal Type of metal used in Earth terminal 32 Minimum phase to phase clearance mm 33 Minimum phase to earth clearance mm 34 Spring and lock washers included Yes/No 35 Manufacturer/supplier Tap changer 36 37 Type Catalogue details attached Yes/No Manufacturers data sheet attached Yes/No Can tap changer switch be locked Tank material Tank Fabrication Thickness of the metal sheet Painting method details attached Width 38 Tank Dimensions 39 Transformer weights Yes/No Height Depth Weight of core and windings Weight of tank Yes/No mm mm mm kg kg Weight of oil at 20 C Total weight of transformer, ready for service Shipping weight of transformer kg kg kg Signature: ___________________ Company Seal 2. Schedule of Non Compliance On this schedule, the Contractor shall provide a list of non-compliances with this specification, documenting the effects that such non-compliance is likely to have on the equipment's life and operating characteristics. Each non-compliance shall be referred to the relevant specification clause. 2.1 Schedule of Non Compliance - 100 kVA Distribution Transformer Clause No Non Compliance 2.2 Schedule of Non Compliance - 250 kVA Distribution Transformer Non Compliance Claus e No 2.3 Schedule of Non Compliance - 400 kVA Distribution Transformer Clause No Non Compliance Signature: ___________________ Company Seal Date: _____________________ 3. Schedule of Test Certificates On this schedule, a list of the test certificates shall be provided. This list shall include type test certificates and sample routine test reports. Each certificate listed shall be referred to the relevant specification clause. 3.1 Schedule of Test Certificates for 100 kVA Distribution Transformer Clause No Type Test Certificate and Routine Test Report 3.2 Schedule of Test Certificates for 250 kVA Distribution Transformer Clause No Type Test Certificate and Routine Test Report 3.3 Schedule of Test Certificates for 400 kVA Distribution Transformer Clause No Type Test Certificate and Routine Test Report Signature: ________________________ Date: ______________________ Company Seal