针对强迫导向油循环风冷(oir directrd air forced,ODAF)结构变压器负荷能力受温升约束影响的问题,提出了 3 种负荷类型情况下变压器负荷能力评估方法.首先,考虑风扇与油泵的运行状态以及油粘度变化对热阻的影响等因素,基于热电类比法建立了变压器热路模型,以计算绕组热点与顶部油温度;其次,采用粒子群优化(particle swarm optimization,PSO)算法拟合热路模型参数,并基于2台不同型号变压器的运行数据,对热路模型的计算精度与拟合参数适用性进行有效性验证;最后,参考GB/T 1094.7负载导则给出的温升限值,基于温升特性提出了负荷能力评估模型.分析结果表明,该研究所提热路模型计算热点温度的误差不大于2.35℃,在工程允许范围内;正常周期性负荷下当环境温度低于1℃时,关闭1组子散热器后仍满足温升约束.
Load Capacity Evaluation of Forced Guided Oil Circulation Air-cooled Transformer Based on Temperature Rise Characteristics
Aiming at the problem that the load capacity of forced guided oil circulation air-cooled(ODAF)transformer is affected by the temperature rise constraint,this paper proposes three kinds of load capacity evaluation methods for trans-former.Firstly,the running state of fan and oil pump and the influence of oil viscosity change on thermal resistance and other factors are taken into account,and a transformer thermal model is established based on thermoelectric analogy method to calculate winding hot spot and top oil temperature.Secondly,particle swarm optimization algorithm(PSO)is used to fit the parameters of the thermal model;meanwhile,based on the operation data of two different types of trans-formers,the calculation accuracy of the thermal model and the suitability of the fitting parameters are validated.Finally,a load capacity evaluation model based on the temperature rise characteristics is proposed by referring to the temperature rise limit given in the load guide GB/T 1094.7.The analysis results show that the error of hot spot temperature calculated by the proposed model is no more than 2.35℃,which is within the allowable range of engineering.Under normal peri-odic load,when the ambient temperature is lower than 1℃,the temperature rise constraint is still satisfied after closing a group of sub-radiators.
load capacityODAF cooling modetransformertemperature rise characteristicthermal model
万方数据
维普
