Research Of Transformer Remote Multi-point Temperature Information Integration Method

In the power system, power transformers occupies a very important position,because the power grid is safe, reliable, economical operation and reliability of power transformer operation has a direct relationship, and stable operation of the transformer is also important to build a strong intelligence network to ensure. Currently, most transformer fault or damaged because of the loss of their insulating ability, and the temperature is the most important factor affecting the transformer insulating ability,including oil and winding temperature. Transformer oil reflects the load capacity of the transformer, determines the life of the transformer; winding temperature is the hottest area within the transformer winding temperature reached, the transformer load factor value is the most relevant. Therefore, accurate measurement of transformer oil and winding temperature for the transformer allows overload and operating life assessment has very important significance.In this paper, Changchun Hexin 500 KV substation technology upgrade project,in-depth studies to transformer temperature information gathering integrated system to focus research on how to improve the measurement accuracy, reduce the measurement error, how to optimize the integration of data and data processing methods, etc., and strive to build a complete, accurate, reliable temperature information gathering integrated system.This paper describes the structural characteristics and working principle of the transformer temperature acquisition system, and accordingly set up the temperature acquisition circuit simulation substation, through experimental analysis defects and shortcomings of its existence, to identify the factors affecting the accuracy of the data,make recommendations for improvement; secondly using linear compensation technology, electronic conversion technology, filtering technology and other complex issues involved, such as a linear problem platinum resistance sensor depth study, we proposed a creative piecewise linear least squares fitting and negative resistance compensation phase a combination of methods to achieve the minimization of data collection errors, and in the past to simplify the complicated algorithm, in addition,environmental issues for external interference, lead resistance interference and harmonic interference, but also one proposed improvement measures and programs; for information integrated system, station communication using more reliable and flexible alternative to single CAN bus, vulnerable to interference RS-485 bus, and in PC A/D converter and a processor link, using the BCD digital conversion technology, to achievescale unified, to ensure three points(detection value, local instrument display, monitoring and control screen display) temperature consistency.Finally, the British Labcenter Electronics developed circuit analysis and simulation software Proteus 7 to improving information collection after temperature integrated system simulation experiments and comparative experiments, the simulation results made a detailed record and a brief analysis proved that the scheme can meet the technical requirements.