运用混联等效电路诊断变压器油纸绝缘状态  

Diagnosing transformer oil-paper insulation by hybrid equivalent circuit

作　　者：林智勇[1] 蔡金锭[1] 

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108

出　　处：《电机与控制学报》2016年第3期1-5,共5页Electric Machines and Control

基　　金：国家自然科学基金(61174117)

摘　　要：针对油纸绝缘变压器内部绝缘介质弛豫响应的复杂性,根据油纸绝缘结构特征,提出建立混联等效电路新模型来表征油纸绝缘弛豫过程。根据混联等效电路的理论分析,推导出混联等效电路参数和回复电压的求解公式。先采用一台变压器回复电压测试数据对该方法进行验证后,再利用一台变压器检修前后的测试数据进行基于混联等效电路的变压器油纸绝缘诊断研究。研究结果表明:通过混联等效电路方法得到的回复电压曲线能够很好的与现场测量的回复电压曲线吻合,且利用混联等效电路能够准确的诊断油纸绝缘变压器的绝缘介质老化情况。Aiming at the complexity of dielectric relaxation response of transformer oil-paper insulation,a hybrid equivalent circuit new model was established to characterize the relaxation process of oil-paper insulation system according to the characteristics of oil-paper insulation. According to theory analysis of hybrid equivalent circuit,formula of the hybrid equivalent circuit parameters and the recovery voltage were deduced. Test data of a transformer recovery voltage was adopted to verify the method,and then the test data of a transformer before and after being maintained was used to diagnose transformer oil-paper insulation system based on hybrid equivalent circuit. The results show that： the return voltage curve which is gained by the hybrid equivalent circuit method inosculates very well with those gained by the field measurements,and the hybrid equivalent circuit can diagnose aging of transformer oil-paper insulation dielectric accurately.

关 键 词：油纸绝缘 混联等效电路 变压器 回复电压 

分 类 号：TM411[电气工程—电器]