Research And Development Of Dual Circulation Device For On-line Oil Purification Of Power Transformer

Transformer is one of the key equipments in power system,its stable operation is very important to power system,and the transformer oil has an obvious effect on the reliability of transformer operation.It is an important means to ensure the cleanliness of transformer oil by using transformer oil purification device to "regenerate" the deteriorated oil,but at present,the oil purification device can only purify the oil under the condition of power failure.Because of the huge economic loss and political influence caused by transformer blackout,it is of great significance to carry out the equipment to make transformer clean oil under the condition of no power outage,that is,on-line oil purification device,which is of great significance to ensure the safe and reliable operation of transformer and even power grid.Based on the detailed analysis of the development of online oil purification at home and abroad and the necessity of developing on-line oil purification equipment,this paper introduces the structure,technical parameters,characteristics and routine oil purification process of the on-line oil purification plant.The flow chart of live oil purification is given.In view of the problem that the oil flow may be charged in the process of electrified oil purification of transformers,the flow control and temperature control methods of transformer on-line clean oil are analyzed,and the flow control device and temperature control device are developed.The oil temperature control device consists of a proportional control valve,a plate heat exchanger and a PLC,PT100 temperature probe.The oil temperature is detected by the temperature probe.PLC compares the real time temperature value detected by the oil discharge with the required set temperature value,calculates by using the over-control module program,and uses the adjusting proportional valve to control the cooling water quantity.To achieve the purpose of accurate control of oil temperature.The flow control device is mainly composed of frequency converter,flow sensor and PLC circuit.By comparing the actual oil output with the corresponding setting parameters of the system,the frequency of output is calculated and analyzed.The frequency of the converter is equal to that of the frequencyaccording to the above data The drive power drives the AC asynchronous motor to control the flow rate of the oil pump according to the frequency required by the frequency converter and realize the real-time control of the flow rate of the oil.Based on the acceptance requirements of the online oil purifying plant,the preparation work and matters needing attention before the online oil purification operation are introduced in detail.In order to control the risk in the implementation of the on-line oil purification project for distribution transformers,this paper introduces the usage methods and requirements of the necessary on-line working appliances,and carries out relevant tests on the protective tools to ensure the safety of the workers.Finally,from the aspects of improving the system operation stability,economy and leading the development direction of the technology,the paper analyzes the benefit of the on-line oil purification device in the practical application process,in order to lay a solid foundation for the popularization and popularization of the on-line oil purification technology.