Minimum leakage distance to ground shall be 300mm Minimum phase/phase and Phase/earth shall be provided by the Supplier in the Schedule. The maximum radio interference voltage shall be 250 microvolts measured in accordance with IEC 60437. The puncture voltage of insulations at 50Hz The minimum wet flashover voltage valueĮ. The minimum dry flashover voltage valueĭ. The Bidder shall also give the following information in the schedule.Ĭ. 32kV across the isolating distances, re IEC 600602, Specification 3. The support insulators must withstand dry and wet test voltage of 50Hz, sustained for one minute of not less than:ī.
Insulators shall be based on the rated voltage of 11kV.ġ. They shall meet the electrical and mechanical characteristics indicated in IEC Standard Publication 60383. The insulators shall be of solid glazed porcelain type and be birdproof. Continuous Operation and Load interrupting: 100A, 200A, 400A Withstand: 28kV, 50Hz, 1 minute dry and wet.Ī. They shall also meet the following electrical test requirements.ī. The complete assemblies shall be rated 105 oC for normal circuit conditions as per IEC 60129. 20 coastal exposures and that all other metal parts shall retain their mechanical strengths. The manufacturer shall confirm that the current contacts shall meet the temperature rise requirements after approx. Salt spray corrosion performance after 1000 hours according to IEC 60507 or equivalent field experience in coastal sites.
Where load break or making current tests have been performed on the model being offered, these test results shall also be attached Operation at the temperature limits to IEC 60129.Ģ. Operating and mechanical endurance tests for IEC 60129 A temperature rise test is required for expulsion fusegear and load isolators per IEC 60060.į. Short time current on load isolator onlyĮ. Radio Interference test on Expulsion Fusegear and Load Isolatorĭ. Dielectric Test on Expulsion Fusegear and Load Isolatorī. The supplier shall confirm on the attached schedule that the following tests have been performed according to IEC 60129, IEC60060, IEC 60437, IEC 602822 and IEC 60507.Ī. Approval of type tests certificates supplied by any other authority is subject to the written acceptance of the Electricity Company of Ghana. Test Certificates as evidence of successful completion of type tests shall be submitted as part of the Bid.Īcceptable independent testing Authorities include the following: KEMA - Holland, CESI - Italy, EDF - France and IREQ, - Quebec, Canada. In this case the Supplier shall provide documentary proof in the form of Certified Test Certificates that the assembled equipment and its component parts been successfully typetested by an independent testing authority in accordance with the relevant clauses of referenced Standards. Type/Design Tests may (at the Purchaser's discretion) be dispensed with if the Supplier furnishes evidence to the Purchaser's satisfaction that the relevant tests have already been performed on identical equipment. Any particular unit or units may, at Purchaser's option, be chosen for testing. Type Tests shall be carried out on individual units at Purchaser's request and shall be separately priced. Routine tests for Expulsion Fusegear shall be selected from the type tests in accordance with IEC 60282, Clause 8.ġ. Routine Tests for load Isolators shall be carried out in accordance with IEC 60129. IEEE C37.41 - Design tests for high voltage fuses, distribution enclosed single pole switches, fuse disconnecting switches and accessories.ĪNSI C37.42 - American national Standard Specifications for Distribution Cutouts and Fuse Links. NEMA National Electrical Manufacturers AssociationĪNSI - American national Standards Institute IEC 60694 - Common specification for high voltage switchgear and control gear standards. IEC 60507 - Artificial pollution tests on high voltage insulators to be used on A.C. IEC 60437 - Radio Interference test on high voltage insulators IEC 60383 - Tests on insulators of ceramic material or glass for overhead lines with a nominal voltage greater than 1000V IEC 60129 - Alternating Current disconnectors and Earth Switches
IEC International Electrotechnical Commission The Load Isolator and Expulsion Fusegear shall comply with the latest edition of and amendments to the Standards/Specifications listed below:
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