%PDF-1.4 %���� For dry-type transformers the off-circuit tap changing is generally done by means of bolted links. If there are leakages, bolt tightening will often help. Protection relays. Inspection for leakages, cracks in porcelain bushings, check of auxiliary equipment etc. 0000010706 00000 n startxref Primary voltage. See supplier’s documentation provided. 0000008087 00000 n Reduce supply voltage or change position on tapchanger. 162 58 If the oil is in good condition, except from particles present in the oil, filtering can be recommended for removal of the particles. Tell us what you're thinking... we care about your opinion! 0000032177 00000 n 0000022708 00000 n Often it is recommended to do both drying and reclaiming on the same transformer. Is the gas relay filled with gas: colour and quality? Check drying material in the dehydrating breather. To take oil samples from hermetically sealed transformers is normally not necessary, and should only be performed after consultation with manufacturer. 2/3 of the silica gel has changed from blue to red colour (old type of silica gel) or from pink to white, respectively. Inspection / maintenance of tap-changers must only be carried out by trained and experienced personnel. Periodic, which is required maintenance as determined by manufacturer’s recommendation and/or SLAC policy Maintenance includes replacement or repair of defective or worn components. The latter is usually the most economical way of doing maintenance. 0000010038 00000 n 0000014478 00000 n 0000000016 00000 n The automatic protection device trips as soon as the transformer is energized. 4908 , dtd.24.3.09 * The last date of and time of receipt of tenders : 21.4.09 up to 1.0PM * Date and time of opening of Technical Bids: 21.4.09 by 3.0 PM * Date and time of opening of Price Bids : 22.4.09 by 11 AM General Manager (Works) NESCO,Balasore. h�b``e``�c`c`-�eb@ !V da�hax������ 2��v��8�ǹ�s! See transformer supplier’s documentation provided. In addition to the above instructions, the following inspection measurements can be carried out: The task of oil in a transformer is to act as an electrical insulation and to transfer heat from the transformer’s active parts into coolers. Testing of oil in transformers should normally be performed 12 months after filling or refilling, subsequently annually on large distribution and power transformers. A short-circuit current has passed the transformer. Through repairs, we restore a transformer to its original condition in all aspects (current, voltage and impedance). Maxima Daya Indonesia has the facilities,skills and expertise to carry out transformer repairs ranging from less than 25 kVA up to 4000 kVA. Tap changer or bolted links. In heavily contaminated installations more frequent inspections may be needed. Reclaiming of oil is performed with the transformer in service (operation). The silica gel shall be changed when approx. Check installation and Contact the electricity utility. The final paint thickness should at least be equal to the original paint thickness. Absence of primary voltage. Remove the failure in the control system. Coils cooling ducts should be cleaned using dry compressed air or nitrogen (maximum pressure 3 bar). If the captured gas is inflammable: Carry out dissolved gas analysis (DGA). 0000004248 00000 n 0000009498 00000 n Short circuit in the control system on the secondary side. Data for installed overvoltage protection. Timing and/or current is incorrectly adjusted. Loose accessories or elements. Inspection and e.g. Field Testing. 1 0 obj <> endobj 2 0 obj <> endobj 3 0 obj <> endobj 4 0 obj <>/Type /Page>> endobj 5 0 obj <> endobj 6 0 obj <> endobj 7 0 obj <> endobj 8 0 obj <> endobj 9 0 obj <> endobj 10 0 obj <> endobj 11 0 obj <> stream Maintenance of HV condenser bushings shall be performed according to the instructions given by the bushing supplier. Increase water flow, clean water circuit / cooler. The control shaft of the off-circuit tap changer is brought through the cover or the tank wall. This is particularly important for places exposed to contamination and moisture. A skilled welder and a welding instruction are required. The transformation ratio can be adjusted with an off-circuit tap changer when the transformer is not energised. When tightening the gaskets special care must be taken to prevent the breaking of screws (bolts) or the gasket “floats away” (if not in a groove) caused by the heavy pressure.

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