The hot spot temperature of a transformer is one of the critical indicators reflecting its operating status.Accurate and fast calculation of hot spot temperature is significant for the online monitoring of transformer...The hot spot temperature of a transformer is one of the critical indicators reflecting its operating status.Accurate and fast calculation of hot spot temperature is significant for the online monitoring of transformers.Considering the low computational efficiency of the transformer’s numerical full model(FM),this paper presents a model simplification method based on the equivalent thermal parameters of windings to expedite hot spot temperature computation.Initially,the representative volume element(RVE)reflecting the periodic structure of windings is selected to formulate a reduced model(RM)for the transformer.Subsequently,to achieve equivalence between the RM and the FM,the equivalent thermal parameters of the RVE are calculated,containing the equivalent thermal conductivity(ETC),the equivalent density(ED),and the equivalent specific heat capacity(ESHC).Finally,the validity of the RM is verified by the temperature rise test.The results show that,compared with the tested data,the maximum error of the hot spot temperature calculated by the RM is 2.56 K,demonstrating the accuracy of the hot spot temperature calculation by the RM.Compared with the FM,the computing time of the proposed RM is reduced to 1/189,which significantly improves the computational efficiency.展开更多
为了掌握配电网电缆运行状况,有效评估电缆线路的载流量,依据等值热路法理论建立三芯电缆稳态及暂态的等值热路模型,基于IEC 60287计算模型参数,分别计算10 k V三芯电缆在空气敷设和土壤敷设下的导体温度。建立实验仿真平台,对等值热路...为了掌握配电网电缆运行状况,有效评估电缆线路的载流量,依据等值热路法理论建立三芯电缆稳态及暂态的等值热路模型,基于IEC 60287计算模型参数,分别计算10 k V三芯电缆在空气敷设和土壤敷设下的导体温度。建立实验仿真平台,对等值热路法计算值和实验结果进行比对及误差分析,验证了等值热路模型的准确性。展开更多
基金supported by Hubei Technology Innovation Center for Smart Hydropower(SDCXZX-JJ-2023-03).
文摘The hot spot temperature of a transformer is one of the critical indicators reflecting its operating status.Accurate and fast calculation of hot spot temperature is significant for the online monitoring of transformers.Considering the low computational efficiency of the transformer’s numerical full model(FM),this paper presents a model simplification method based on the equivalent thermal parameters of windings to expedite hot spot temperature computation.Initially,the representative volume element(RVE)reflecting the periodic structure of windings is selected to formulate a reduced model(RM)for the transformer.Subsequently,to achieve equivalence between the RM and the FM,the equivalent thermal parameters of the RVE are calculated,containing the equivalent thermal conductivity(ETC),the equivalent density(ED),and the equivalent specific heat capacity(ESHC).Finally,the validity of the RM is verified by the temperature rise test.The results show that,compared with the tested data,the maximum error of the hot spot temperature calculated by the RM is 2.56 K,demonstrating the accuracy of the hot spot temperature calculation by the RM.Compared with the FM,the computing time of the proposed RM is reduced to 1/189,which significantly improves the computational efficiency.
文摘为了掌握配电网电缆运行状况,有效评估电缆线路的载流量,依据等值热路法理论建立三芯电缆稳态及暂态的等值热路模型,基于IEC 60287计算模型参数,分别计算10 k V三芯电缆在空气敷设和土壤敷设下的导体温度。建立实验仿真平台,对等值热路法计算值和实验结果进行比对及误差分析,验证了等值热路模型的准确性。
