What Problems Should be Paid Attention to in the Application of Transformer Bushing?

20Dec

What Problems Should be Paid Attention to in the Application of Transformer Bushing?

 

 

What Problems Should be Paid Attention to in the Application of Transformer Bushing?

1. In the process of hoisting, laying and transportation, the hoisting speed of casing should be slow to avoid collision with other objects; When vertical lifting installation, the lifting lug on the flange should be used, and the upper part of the casing should be tied with hemp rope to prevent tipping; Pay attention to not lift the casing porcelain skirt, in case of wire rope and porcelain cover collision damage; When the casing is erected, avoid any part falling to the ground; The casing should be placed in a special box when it is laid down and transported. Flange installation should have two support points, the upper part of the porcelain skirt is provided with support points, the tail should also be provided with support points, and soft things will pad the support point. The casing should be fixed in the box to avoid movement damage during transportation.

2. In the assembly of casing overhaul, special attention should be paid to the following points: prevent moisture. In addition to clean and dry conditions in assembly, it is best to assemble at 40-50℃ temperature. Because the temperature of the capacitor core is 10-15℃ higher than the ambient temperature can reduce the influence of moisture, so it is best to heat the parts of the casing and the capacitor core to 70-80℃ before assembly, keep it for 3-4h, in order to eliminate the surface moisture, as far as possible in the temperature has not reduced the assembly; Casing top seal. The sealing of casing top can be divided into the sealing of casing itself and the sealing of cable lead. In most substations, the oil storage tank of the main transformer is topped with an elastic corrugated plate, which, together with the compression spring, regulates the temperature change. When assembling the elastic corrugated plate, the sealing ring between the positive and negative pressing nuts on the conduit and the sealing gasket on the oil storage cabinet must be properly matched to prevent the corrugated plate from cracking, so as to achieve the sealing effect. The casing lead is a cable structure, if the sealing between the top wiring board and conductive head is not tight, rain water will infiltrate into the transformer along the wiring board, conductive head and cable. Moisture into the transformer lead root, will lead to moisture breakdown, resulting in power failure.

3. Maintenance personnel should pay attention to the following problems: when the tester disconnects the small casing lead of the end screen, it should prevent the guide rod from rotating or breaking the ground lead, and it should be restored to its original state after the test. According to my working experience, a multimeter can be used to measure the grounding of the end screen after the test, which is a more reliable way to check whether the grounding of the end screen has been restored after removal; Sampling valve should be tightened after oil sampling personnel work. When disconnecting the lead, the personnel should pay attention to prevent the casing damage; Maintenance personnel should observe the casing oil level and fill oil in time.

What Problems Should be Paid Attention to in the Application of Transformer Bushing?


1. In the process of hoisting, laying and transportation, the hoisting speed of casing should be slow to avoid collision with other objects; When vertical lifting installation, the lifting lug on the flange should be used, and the upper part of the casing should be tied with hemp rope to prevent tipping; Pay attention to not lift the casing porcelain skirt, in case of wire rope and porcelain cover collision damage; When the casing is erected, avoid any part falling to the ground; The casing should be placed in a special box when it is laid down and transported. Flange installation should have two support points, the upper part of the porcelain skirt is provided with support points, the tail should also be provided with support points, and soft things will pad the support point. The casing should be fixed in the box to avoid movement damage during transportation.


2. In the assembly of casing overhaul, special attention should be paid to the following points: prevent moisture. In addition to clean and dry conditions in assembly, it is best to assemble at 40-50℃ temperature. Because the temperature of the capacitor core is 10-15℃ higher than the ambient temperature can reduce the influence of moisture, so it is best to heat the parts of the casing and the capacitor core to 70-80℃ before assembly, keep it for 3-4h, in order to eliminate the surface moisture, as far as possible in the temperature has not reduced the assembly; Casing top seal. The sealing of casing top can be divided into the sealing of casing itself and the sealing of cable lead. In most substations, the oil storage tank of the main transformer is topped with an elastic corrugated plate, which, together with the compression spring, regulates the temperature change. When assembling the elastic corrugated plate, the sealing ring between the positive and negative pressing nuts on the conduit and the sealing gasket on the oil storage cabinet must be properly matched to prevent the corrugated plate from cracking, so as to achieve the sealing effect. The casing lead is a cable structure, if the sealing between the top wiring board and conductive head is not tight, rain water will infiltrate into the transformer along the wiring board, conductive head and cable. Moisture into the transformer lead root, will lead to moisture breakdown, resulting in power failure.


3. Maintenance personnel should pay attention to the following problems: when the tester disconnects the small casing lead of the end screen, it should prevent the guide rod from rotating or breaking the ground lead, and it should be restored to its original state after the test. According to my working experience, a multimeter can be used to measure the grounding of the end screen after the test, which is a more reliable way to check whether the grounding of the end screen has been restored after removal; Sampling valve should be tightened after oil sampling personnel work. When disconnecting the lead, the personnel should pay attention to prevent the casing damage; Maintenance personnel should observe the casing oil level and fill oil in time.