Transformer common fault treatment countermeasures
1. Transformer oil leakage treatment
Due to the transformer oil leakage of many reasons, need for different causes of oil leakage caused by different forms of welding treatment. For the cracks in the plane can be used directly welded way to deal with, for the cracks in different planes, need to iron plate cut for spindle shape for patch welding, in order to prevent the possibility of oil leakage after. For different oil leakage areas, need to use different treatment methods, oil tank leakage needs to be directly welded to the plane area, corner cracks need to first find the location of the leakage in the special welding.
Corner welding needs to take into account the parameters of the internal stress of the corner, to avoid exceeding the limit of the internal stress caused by the leakage again. In the low pressure side of the casing leakage needs to be first troubleshooting, to rule out the lead is too short and the busbar overstretching, adjust the length of the lead and busbar expansion joints, usually can solve the problem. For the explosion-proof tube at the oil leakage, if due to excessive pressure inside the transformer, resulting in the case of tank rupture, you need to remove the explosion-proof tube, retrofitting pressure type valves and other devices.
2. Iron core multi-point grounding processing
Transformer core multi-point grounding method can be divided into two ways, one is to open the box inspection, using this simple and direct way to remove the transformer cover on the grounding point, while the use of insulating cardboard inspection, for the impact of the normal use of the situation in a timely manner to find and replace. Another method is through the access to DC current impact method, the use of DC current thermal effect burn off more than with the core grounding, generally after four to five times of DC current impact can be solved excess grounding.
3. Transformer moisture treatment
Transformer moisture can be used offline processing and online processing two kinds of treatment. Offline processing compared to online processing by the use of the conditions of the limitations of the implementation of the process there are a lot of difficulties, the maintenance process needs to be a long time power outage processing, but also may cause accelerated aging of the transformer insulation parts. Offline processing needs to consider the characteristics of different voltage device capacity and structure, the implementation of its moisture and heating treatment. The online treatment is mainly through the online oil filtration to remove the water in the transformer oil, and spray water into the vacuum eye, so that the gas and water in the vacuum container is transferred to the environment.
The transformer oil is re-injected into the transformer after a certain process of degassing and dewatering. Compared with offline treatment, online treatment is characterised by short outage time and less likely to cause equipment damage.
Common transformer faults include transformer oil leakage, connector overheating, transformer moisture, etc., according to different parts and different reasons for the faults need to be targeted transformer fault treatment, treatment should be kept flexible and changeable. The transformer maintenance personnel need to constantly sum up experience, analyse the characteristics of the fault, and constantly improve the level of fault handling in practice.
Due to the transformer oil leakage of many reasons, need for different causes of oil leakage caused by different forms of welding treatment. For the cracks in the plane can be used directly welded way to deal with, for the cracks in different planes, need to iron plate cut for spindle shape for patch welding, in order to prevent the possibility of oil leakage after. For different oil leakage areas, need to use different treatment methods, oil tank leakage needs to be directly welded to the plane area, corner cracks need to first find the location of the leakage in the special welding.
Corner welding needs to take into account the parameters of the internal stress of the corner, to avoid exceeding the limit of the internal stress caused by the leakage again. In the low pressure side of the casing leakage needs to be first troubleshooting, to rule out the lead is too short and the busbar overstretching, adjust the length of the lead and busbar expansion joints, usually can solve the problem. For the explosion-proof tube at the oil leakage, if due to excessive pressure inside the transformer, resulting in the case of tank rupture, you need to remove the explosion-proof tube, retrofitting pressure type valves and other devices.
2. Iron core multi-point grounding processing
Transformer core multi-point grounding method can be divided into two ways, one is to open the box inspection, using this simple and direct way to remove the transformer cover on the grounding point, while the use of insulating cardboard inspection, for the impact of the normal use of the situation in a timely manner to find and replace. Another method is through the access to DC current impact method, the use of DC current thermal effect burn off more than with the core grounding, generally after four to five times of DC current impact can be solved excess grounding.
3. Transformer moisture treatment
Transformer moisture can be used offline processing and online processing two kinds of treatment. Offline processing compared to online processing by the use of the conditions of the limitations of the implementation of the process there are a lot of difficulties, the maintenance process needs to be a long time power outage processing, but also may cause accelerated aging of the transformer insulation parts. Offline processing needs to consider the characteristics of different voltage device capacity and structure, the implementation of its moisture and heating treatment. The online treatment is mainly through the online oil filtration to remove the water in the transformer oil, and spray water into the vacuum eye, so that the gas and water in the vacuum container is transferred to the environment.
The transformer oil is re-injected into the transformer after a certain process of degassing and dewatering. Compared with offline treatment, online treatment is characterised by short outage time and less likely to cause equipment damage.
Common transformer faults include transformer oil leakage, connector overheating, transformer moisture, etc., according to different parts and different reasons for the faults need to be targeted transformer fault treatment, treatment should be kept flexible and changeable. The transformer maintenance personnel need to constantly sum up experience, analyse the characteristics of the fault, and constantly improve the level of fault handling in practice.