Find out the cause and location First, you must carefully analyze the oil seepage before you find out the cause of the leak and the exact leakage point. For the existing oil stains, use a small flat shovel, wire brush to clean, and then use xylene cleaning, rinse with clean water, and finally wipe clean with a net cloth to find the exact location of the leak.
2.2 Treatment options The leakage of transformers can be broadly classified into leakage of seals and leakage of welds. Dealing with leakage of seals is mainly to improve seal quality. For seals such as bushings, oil seals, radiator valves, large covers, on-load switches, etc., if the fastening screws are not valid, replace the seals or re-seal Deal with welding leakage, can take repair welding methods. No matter what kind of leakage oil is being processed, thick materials or binding methods should be prohibited.
2.2.1 The sealing bearing rubber sealing area should be compatible with the strength of the screw, otherwise it is difficult to compress; replace the oil plug rubber seal ring, the parts of the valve should be closed at the entrance and the channel, to maintain its own negative pressure To replace the oil in large quantities, the seals should have good oil resistance and anti-aging properties, good elasticity and mechanical properties, and the sealing material should avoid the use of materials such as asbestos packing and cork pads as much as possible.
Components with poor structure or unreasonable sealing methods, such as the flanges of radiators and oil purifier coupling flanges, are not easily deformed when the bolts are tightened, so that the flanges are not tightly pressed and should be modified or replaced. The crimped surface of the seal should be clean and smooth. When placing the pad, it is best to apply a layer of adhesive glue such as polyvinyl chloride, varnish, etc.
2.2.2 When the leakage is found in the upper part of the welding transformer tank, only a small amount of oil is required to be welded. When the leakage is found in the lower part of the tank, the oil discharge of the hanging core is too large and is limited by the site conditions. . Welding with oil should be carried out in the case of oil leakage is not significant, or vacuum pumping method should be used to cause negative pressure after welding, negative pressure vacuum should not be too high, with equal pressure inside and outside the appropriate, to avoid inhalation of hot metal.
Welding with oil is generally prohibited using gas welding; welding using finer electrodes such as 422, 425 welding is appropriate; repair welding should clean the site of the traces of the oil, it is best to use alkaline water and then wipe dry; welding process Attention should be paid to the prevention of penetration and fire. The welding site must be below the oil level. When welding, discontinuous and rapid spot welding should be used. The arcing time should be controlled within 10s to 20s. Absolute long-time continuous welding is not allowed.
When repairing leaks with severe oil leakage, they may be blocked with iron wire or riveted and then welded. When welding near the sealing rubber gasket or other vulnerable parts, cooling and protective measures shall be taken.
2.2.3 sand holes on the sand castings can be used Diyou No. 1 plugging rubber pressure block, after plugging should pay attention to reinforcement, and then use the hair dryer to bake 5min ~ 15min until curing. When blocking, you should wipe the oil trace first.
2.2 Treatment options The leakage of transformers can be broadly classified into leakage of seals and leakage of welds. Dealing with leakage of seals is mainly to improve seal quality. For seals such as bushings, oil seals, radiator valves, large covers, on-load switches, etc., if the fastening screws are not valid, replace the seals or re-seal Deal with welding leakage, can take repair welding methods. No matter what kind of leakage oil is being processed, thick materials or binding methods should be prohibited.
2.2.1 The sealing bearing rubber sealing area should be compatible with the strength of the screw, otherwise it is difficult to compress; replace the oil plug rubber seal ring, the parts of the valve should be closed at the entrance and the channel, to maintain its own negative pressure To replace the oil in large quantities, the seals should have good oil resistance and anti-aging properties, good elasticity and mechanical properties, and the sealing material should avoid the use of materials such as asbestos packing and cork pads as much as possible.
Components with poor structure or unreasonable sealing methods, such as the flanges of radiators and oil purifier coupling flanges, are not easily deformed when the bolts are tightened, so that the flanges are not tightly pressed and should be modified or replaced. The crimped surface of the seal should be clean and smooth. When placing the pad, it is best to apply a layer of adhesive glue such as polyvinyl chloride, varnish, etc.
2.2.2 When the leakage is found in the upper part of the welding transformer tank, only a small amount of oil is required to be welded. When the leakage is found in the lower part of the tank, the oil discharge of the hanging core is too large and is limited by the site conditions. . Welding with oil should be carried out in the case of oil leakage is not significant, or vacuum pumping method should be used to cause negative pressure after welding, negative pressure vacuum should not be too high, with equal pressure inside and outside the appropriate, to avoid inhalation of hot metal.
Welding with oil is generally prohibited using gas welding; welding using finer electrodes such as 422, 425 welding is appropriate; repair welding should clean the site of the traces of the oil, it is best to use alkaline water and then wipe dry; welding process Attention should be paid to the prevention of penetration and fire. The welding site must be below the oil level. When welding, discontinuous and rapid spot welding should be used. The arcing time should be controlled within 10s to 20s. Absolute long-time continuous welding is not allowed.
When repairing leaks with severe oil leakage, they may be blocked with iron wire or riveted and then welded. When welding near the sealing rubber gasket or other vulnerable parts, cooling and protective measures shall be taken.
2.2.3 sand holes on the sand castings can be used Diyou No. 1 plugging rubber pressure block, after plugging should pay attention to reinforcement, and then use the hair dryer to bake 5min ~ 15min until curing. When blocking, you should wipe the oil trace first.
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