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TEDAŞ-MYD-96-021 TURKISH ELECTRICITY DISTRIBUTION CO. DEPARTMENT OF MATERIAL MANAGEMENT TECHNICAL SPECIFICATIONS FOR BUSHINGS FOR MEDIUM VOLTAGE SYSTEMS CONSULTANT: ELTEM-TEK ELECTRICAL INSTALLATIONS ENGINEERING SERVICES AND TRADE CO. JUNE, 1996 TEDAŞ-MYD-96-021 TECHNICAL SPECIFICATIONS FOR BUSHINGS FOR MEDIUM VOLTAGE SYSTEMS CONTENTS 1. GENERAL 1.1. Scope and Content 1.2. Standards 1.3. Operating Conditions 2. TECHNICAL CHARACTERISTICS 2.1. Type 2.2. Electrical and Mechanical Characteristics 2.3. Structural Characteristics 2.3.1. Insulation Sections 2.3.2. Metal Sections 2.3.3. Terminals 2.3.4. Assembly Formation 2.3.5. Label 3. TESTS 3.1. 3.2. 3.3. Type Tests Routine Tests Acceptance Tests and Rules 3.3.1. Acceptance Tests and Sampling 3.3.2. Acceptance Criteria 3.3.3. Rules on Acceptance Tests 3.3.4. Acceptance Procedure 4. MISCELLANEOUS CONDITIONS 4.1. 4.2. 4.3. 4.4. 4.5. Packaging Documents to be submitted with the Bid Documents to be submitted for Approval Prices Guarantee ANNEXES ANNEX – I : Bill of Materials ANNEX – II : Schedule of Guaranteed Characteristics 1 TEDAŞ-MYD-96-021 TECHNICAL SPECIFICATIONS FOR BUSHINGS FOR MEDIUM VOLTAGE SYSTEMS 1. GENERAL 1.1. Scope and Content This Specification covers the technical characteristics of bushings having rated current less than 3150 A, to be purchased for use in medium voltage distribution networks having system voltage of 36 kV and lower. Unless otherwise stated in the Specification and in its annexes, bushings in the scope of this Specification shall be delivered as a complete unit with its all auxiliary accessories. Types and technical characteristics of bushings to be purchased are specified in the Bill of Materials and/or Schedule of Guaranteed Characteristics. 1.2. Standards Design, manufacturing and tests of bushings in the scope of this Specification shall be performed complying with the last editions of standards given below. TS595/IEC 137 Bushings used in alternating voltages over 1000 V. IEC 815 Guide for insulator selection according to pollution conditions TS6080/IEC 437 Radio interference test in high voltage insulators If different standards are applied, which are equivalent or superior, their Turkish or English copies shall be given with the bid. 1.3. Operating Conditions Unless otherwise stated in the Bill of Materials, bushings considered for ordering shall be suitable to the operating conditions defined below. OPERATING CONDITIONS INSIDE OF BUILDING (indoor) OUTSIDE OF BUILDING (outdoor) _________________________________________________________________________ - Altitude - Ambient temperature . minimum . maximum . 24 hours average - Ambient air pollution : Unless otherwise stated, below 1000 m : - 25 °C : 40 °C : Below 35 C° :- - Icing :- - Wind pressure :- - Earthquake . Horizontal acceleration . Vertical acceleration : 0.5 g : 0.8 x horizontal acceleration - 40 °C 45 °C Below 35 C° According to Bill of Materials Class 10, 10 mm 700 Pa (34 m/s wind speed) 2 TEDAŞ-MYD-96-021 2. TECHNICAL CHARACTERISTICS 2.1. Type Bushings shall be made of ceramic, glass or resin and shall be of these types below according to its usage areas: - Outside of building - inside of building (ceramic or glass) - Inside of building (epoxy resin, ceramic or glass) 2.2. Electrical and Mechanical Characteristics Bushings shall have these characteristics below, unless otherwise stated in the Bill of Materials. - Rated Voltage, Un - Dry lightning impulse withstand voltage - Power frequency withstand voltage (dry and wet) - Rated frequency - Rated current, In (kV) : 7.2 12 17.5 36 (kV) : 60 75 95 170 (kV) : (Hz) : (A) : 20 28 38 70 50 630, 800, 1000, 1250, 1600, 2000, 2500, 3150 - Short time thermal rated current, Ith (1 second) (kA) : - Dynamic rated current (kA) : - Mounting angle : - Console load minimum strength value from the : 25 times of rated current 2.5 times of short term thermal rated current At an any angle between horizontal axis and vertical axis According to the Bill of Materials (shall be selected table below) Rated Current (A) ≤800 1000-1600 2000-2500 3150 ___________________________________________________________________ Console load minimum strength value (N) 1000 1250 2000 - Minimum nominal specific creepage distance indoor and outdoor types . Pollution level for II-MEDIUM : 20 mm/kV (*) . Pollution level for III-HEAVY : 25 mm/kV (*) (*) Maximum operating voltage rms value between phases. 2.3. 3150 Structural Characteristics 2.3.1. Insulation Sections - Bushings shall endure both at normal operating conditions and against drawing, torsion and bending forces caused by extreme voltages and short circuits occurring in the system, forces caused by earthquake and vibration, in addition, they shall be designed and manufactured not to crack and to be broken by stress due to sudden temperature changes, expansion or shrinking. - Insulation sections of insulators shall be flat and symmetric, shall provide uniform distribution of mechanical stresses and electric fields, and shall be designed to minimize radio interferences. Radio interference voltage (RIV) produced by insulators shall not exceed the values pointed in IEC 437. 3 TEDAŞ-MYD-96-021 - There shall be no foreign matters, crack, barking, air bubble, scratch, sand, roughness, spot, stain and similar faults. - Ceramics of insulators shall have high quality and homogenous structure, bare surfaces of insulators to atmosphere shall be glazed by a brown and bright glaze smoothly. Glaze shall not be affected by sudden temperature changes, and shall be endurable to industrial pollution, ozone, acid, alkalis, powder and the other atmospheric conditions. - Glass insulators shall be produced by hardened lime – soda glass. - In the manufacturing of bushings only organic material shall be used, insulator made of different organic materials shall not be accepted. 2.3.2. Metal Sections All bushings shall have conductors. All metal parts and bolt arrangement shall be determined not to separate from insulator body under temperature changes and mechanical forcing; material to be used for the determination shall have high quality and shall have characteristics not to make chemical reactions with metal parts. All metal parts of bushings except conductors shall be made of corrosion enduring metals or shall be hot dived galvanizing. Characteristics of galvanizes shall comply with TS 914/ISO 1459, 1460, 1461. Galvanize coating thickness shall be; - For iron and steel cast and forged materials 600 g/m2, average 500 g/ m2, minimum - For bolts, nuts and washers 2 375 g/ m , average 300 g/ m2, minimum 2.3.3. Terminals Connection terminals of conductors of bushings shall be produced by materials which do not make electro-coupling effect with aluminum conductors. Terminals shall have capacities to carry the rated currents without occurring any heating in any part of the gate insulator. The Bidders shall add the drawings showing shapes, dimensions and cross sections of conductors and terminals to their bids. 2.3.4. Mounting Formation Bushings shall be equipped with an endurable and not deformable determination flange for mounting. At each rated voltages, for all rated currents, angle between the dimensions of determination flanges of bushings and determination holes shall have the same measuring. There shall be earthling nut of at least M12 measure on the determination flange and it shall be marked with earth symbol. 2.3.5. Label On all of the bushings, there shall be label made of stainless steel or other corrosion endurable metal. 4 TEDAŞ-MYD-96-021 Label shall be attached on insulator flange by steel screws or pin at normal operating conditions that can easily be visible. Writings and marks shall not be decayed by the time. This information given below shall be on the label: - Name and/or mark of manufacturer - Its manufacturing year and serial number or type - Rated voltage, rated phase – earth voltage and rated frequency - Lightning pulse strength voltage - Rated current 3. TESTS Unless otherwise unstated, gate insulator tests shall be done according to TS595/IEC137 standards. 3.1. Type Tests Type tests to be applied on all bushings in the content of Specification is revealed below: - Network frequency voltage strength test at wet, - Lightning pulse voltage strength test at dry, - Temperature increasing test - Short term thermal current strength test - Dynamic current strength test - Consol load strength test - Measuring of radio interference test (IEC 437) 3.2. Routine Tests Routine tests to be applied by manufacturer to each bushings manufactured are defined as below. - Measuring of dielectric loss factor (tan ë) (shall be applied to epoxy resin bushings) - Network frequency voltage strength at dry - Measuring of partial discharging level (epoxy resin shall be applied to bushings) (IEC 137 and IEC 270) 3.3. Acceptance Tests and Rules 3.3.1. Acceptance Tests and Sampling Acceptance tests contents below, otherwise unstated in contract documents and in its annexes; - Type tests in Article 3.1. Repeating all or some of the type tests may be required as acceptance test. Type tests (if required) shall be carried out for all manufacturing types of bushings on the required number of sample(s) by tests. - Routine tests revealed in Article 3.2. All routine tests shall be repeated on samples taken from each delivery parties. The same type or structure of bushings in one turn are considered to be one party. Samples shall be selected randomly by the Purchaser’s representative at each delivery and if otherwise unstated, number of samples shall be according to the table below. 5 TEDAŞ-MYD-96-021 Amount in Party Number of Sample 3 5 8 <150 151 - 1200 1201 - 3200 3.3.2. Acceptance Criteria a) Positive results should be taken from all types of type tests. In case of a type test is resulted negative, if Purchaser concludes that operation security of bushings will be lost, he/she shall be able to reject all the insulators at the same type. The Purchaser, on condition that expenditures belongs to him, can accept demands of manufacturer to make changes on the design of bushings, and on condition that expenditures belongs to him, he may repeat all type tests clarified in the Specification demanded by Purchaser. b) Positive result were taken form all sample tests – if any – in allowable tolerances. If negative result is taken from any routine tests, all bushings forming this party shall be re-tested. According to this, faulty units shall be changed by manufacturer, on condition that expenditures are belonging to him. 3.3.3. Rules Related to Acceptance Tests i) In case the type test reports are not given or the given reports are considered inadequate, all or some of the type tests described in Article 3.1. as indicated in the Specification shall be carried out at the manufacturer’s establishments or in the domestic or in a neutral laboratory in abroad on condition that expenditures are belonging to the Supplier. If some of the type tests are decided to be carried out at abroad, the other tests shall not be started to be carried out before successful test reports belonging to them are presented to the Purchaser. Supplier shall be able to demand prolongation for the possible delays of delivery due to the acceptance tests. No payment shall be done to Supplier until the acceptance tests are resulted. ii) Although type test reports given with the bid are considered to be adequate or positive results were taken from type tests carried out during the acceptance tests of the first party delivery, the Purchaser, on condition that belonging his decision completely to him, may require repeating of all or some of the tests in the manufacturer’s establishment or in domestic or at abroad in a neutral laboratory at the first party of delivery or at the subsequent deliveries. Necessary amount of sample(s) required by tests/standards for type tests shall be selected by Purchaser representatives. For type tests to be carried out in domestic and at abroad, samples shall be sealed and sent to laboratory in which the test shall be done by manufacturer. In case of positive results are taken from these tests, all the expenditures are paid by the Purchaser, on the type test prices indicated in the contract in TL. If the test prices are given in foreign currency, it shall be exchanged to TL by the selling exchange rate of the Central Bank of Republic of Turkey of the test date. In case or negative results are taken from the test, all the expenditures of test shall be paid by the Supplier and remaining part of the order shall be canceled. 6 TEDAŞ-MYD-96-021 3.3.4. Acceptance Procedure i) Purchaser can test the materials during manufacturing or transportation, at the manufacturer or subcontractor’s place. Supplier shall provide all kinds of aid and convenience for the Purchaser representatives to do these tests. ii) Supplier shall send the test program to the Purchaser after the contract signed. Supplier shall inform the Purchaser the essential beginning of the tests at least 20 (twenty) days before the tests to be carried out abroad, and 7 (seven) days before the tests to be carried out in domestic. iii) Carrying out of all routine tests at the manufacturer’s establishment is essential. If there are tests was not carried out although they are considered to be done at the manufacturer’s establishment, they shall be provided to complete in 15 (fifteen) days following its acceptance tests. Otherwise, the material is considered to be unready to delivery. Date of tests carried out delayed is taken as delivery date on condition that they are delivered to the Purchaser in 7 (seven) days. However, the Purchaser keeps the rights of implementation of the related particulars of the contract about delays. iv) Tests shall be conducted in front of the Purchaser’s representative. At the test report, there shall be serial numbers of the sample(s) and information ensuring the determination of all the main sections, and reports shall be arranged to indicate that the reports and materials are suitable for this contract and condition in annexes and signed mutually. If the test report is positive, the Purchaser’s representative shall write the shipping order for the related material party. Purchaser can notify that he will not be present at the tests by informing on time. In this case, Supplier shall carry out the tests and inform the Purchaser about the results. Test reports prepared and signed by Supplier shall be sent as 5 sets to Purchaser for his investigation and approve. In case of the test reports are approved, shipment order shall be given by Purchaser, approved 1 (one) set of Test Report shall be sent to Supplier. If Purchaser were not present during the tests were carried out abroad, sample(s) shall be resealed and sent back by laboratory after the test is completed. The said sample(s) shall be investigated by Purchaser’s representatives at the manufacturer’s establishments. v) If the materials are examined, underwent to test and accepted by the Purchaser and its representatives, it does not limit or eliminate the rights to reinvestigate, making tests and reject if necessary at the last delivery place. vi) Carrying out these particulars of this article does not eliminate guarantee and the other obligations of the Supplier in scope of the contract. 4. MISCELLANEOUS CONDITIONS 4.1. Packaging Bushings shall be dispatched after they are packaged. Each insulator shall be placed in a box made of cardboard or other proper material after it is wrapped by reliable packaging cards. Insulators shall be packaged in strong chases and chases shall be bonded by steel hoops against damages during their transportation. 7 TEDAŞ-MYD-96-021 Woods used in packaging chase shall be made of pine or similar lumber, poplar or similar week woods shall not be used. Woods shall have fewer branches as much as possible, and woods having disintegrated branches, rotten parts and spitted and departed woods shall not be used. Supplier shall reveal packaging methods, thickness of packaging woods, outer dimensions of chases and transportation weights in his bid, and he shall also present them to the Purchaser’s approve. The information given below shall be written on chases as not to be affected from environmental conditions: - Name of Manufacturer - Name and Address of Purchaser - Order Number of Purchaser - Type of Insulator - Rated Voltage - Rated Current - Number of insulators in chase - Chase weight - Chase dimensions 4.2. Documents to be submitted with the Bid The documents given below shall be given with the bid: - Schedule of Guaranteed Characteristics The Bidders shall fill out and sign the Schedule of Guaranteed Characteristics for bushings at the each pose, and shall add one of their copies to their bids. The information given in this list shall be binding. - Reports or certificates of type tests carried out in a neutral laboratory Test reports shall comprise reports or certificates of test carried out in a neutral laboratory, name of the laboratory in which the test is carried out, sign of persons who had carried out the test or presented as an observer and test dates. In the previous orders, test report carried out in the presence of Purchaser shall also be accepted. Test reports should belong to proposed type. Test reports should belong to proposed type. For this reason, Purchaser, if necessary, may require from the Bidders to prove the test reports belong to the proposed type. If manufacturing is done under a license, in this case type test report shall belong to domestic manufacturing. - Detailed pictures showing figures and main dimensions considered to be given in the related standards and tolerances to be applied. - Pictures showing dimensions and shapes of conductors and connection terminals, - Catalogs defining manufacturing and technical characteristics of bushings, - Packaging method, chase dimensions and weights, - ISO 9001 or 9002 quality system document and/or Compliance with Turkish Standards document Purchaser may be given the right for rejection of the bid, if one of the required documents or pictures are missing or missing information is given. The Purchaser, on condition that belonging his decision completely to him, for materials of which type test report are not given or considered to be inadequate; on condition that expenditures or type tests to be carried out in domestic or at abroad belong to Supplier, he may take the bid into evaluation on sample(s) to be selected from the first party delivery of which 8 TEDAŞ-MYD-96-021 tests can be carried out in domestic, on condition that he have it done before the first party delivery for tests can be carried out at abroad. 4.3. Documents to be submitted for Approval Supplier shall send the documents given below for approval after the order is given, in duration to be defined in the contract. - 4.4. Pictures showing shapes and the main dimensions of bushings, Pictures showing shapes and dimensions of conductors and connection terminals, Label Pictures Packaging method, dimensions and weights of chases Prices Bid prices shall include the prices below; - Bushings, - Routine tests (including tests to be repeated for acceptance purpose) - Packaging The Bidders shall give separately; - Unit prices of type tests carried out in domestic, - Each type test prices including laboratory test price, transportation, insurance etc. of type tests to be carried out at abroad. 4.5. Warranty Supplier shall guarantee each bushings sold, against the material, workmanship and design faults for 24 (twenty-four) months of duration beginning from the delivery date of compact center and in its equipments. In case of insulators are found to be faulty or failed due to the design, material and manufacturing faults, the Supplier shall make changes as approved by the Purchaser on condition that dismounting, transportation, mounting, etc. expenditures are belonging to him. Material that is changed by this manner shall exactly comply with the guarantee conditions above. 9 TEDAŞ-MYD-96-021 ANNEX - I BUSHINGS FOR MEDIUM VOLTAGE SYSTEMS BILL OF MATERIALS Order No : ........ POS NO : 1 1. Bushing type - Outdoor – Indoor and outdoor - Insulation Material (porcelain, glass or epoxy resin) : : : : 2. Rated voltage, Un 3. Rated current, In 4. Environment pollution level . II - MEDIUM . III - HEAVY (kV) : (A) : 5. Altitude (if it is higher than 1000 m) 6. Material code number of Purchaser 7. Quantity (m) : : : : (ea.) : 10 2 3 4 TEDAŞ-MYD-96-021 ANNEX – II BUSHINGS FOR MEDIUM VOLTAGE SYSTEMS SCHEDULE OF GUARANTEED CHARACTERISTICS Order No : ................ Pos No : ................ Material Code No. of Purchaser : ................ Required 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. Manufacturer Manufacturer type designation Standards applied Bushing type - Outdoor – Indoor and outdoor - Insulation material (Porcelain, glass or epoxy resin) : : : : : : Rated frequency (Hz) : 50 Rated voltage, Un (kV) : Dry lightning impulse withstand voltage(kV – peak) : Power frequency withstand voltage (kV – eff.): Rated current, In (A) : Rated short time thermal current, Ith (kA) : Rated dynamic current, Idyn (kA) : Dielectric loss factor (tan δ) (for epoxy resin) (mm) : 0.02 max. Tangent of loss angle : Partial discharge (pC) : Minimum strength of console load (N) : Terminals : 2 Conductor material and its cross section (mm ) : Mounting angle : Net weight (kg) : Gross weight (kg) : 11 Guaranteed