In view of the problem that the long measurement of recovery voltage polarization spectrum and frequency domain dielectric spectrum affect identification efficiency of the extended Debye equivalent circuit parameters of transformer oil-paper insulation system, this paper proposes a novel identification method. At first, this paper proposes characteristics of hybrid time-frequency dielectric spectrum, which consist of the recovery voltage polarization spectrum characteristics under short charging time and small amount of frequency dielectric spectrum characteristics. Then, based on these proposed characteristics, using multi-objective particle swarm optimization (PSO) to identify equivalent circuit parameters. At last, compare the test time of the proposed method with the on-site testing. The results show that: equivalent circuit parameters of the extended Debye constructed by using characteristics of the hybrid time-frequency dielectric spectrum can effectively restore the complete recovery voltage polarization spectrum and frequency domain spectrum which field measured. The coincidence between the calculated and measured values of the two kinds of dielectric spectrum is above 95%. Moreover, the new method can reduce the test time by 61% compared to the recovery voltage measurement alone and by 46% compared to the frequency domain spectrum alone. The new method not only ensures the accuracy of parameter identification, but also greatly reduces the test time and improves the test efficiency. It is of great significance to the application and popularization of dielectric spectrum measurement technology in transformer on-site insulation detection.
[1] 刘道生,周春华,丁金,等. 变压器纳米改性油纸复合绝缘研究综述[J]. 电工技术学报,2023,38(9):2464-2479,2490.LIU Daosheng, ZHOU Chunhua, DING Jin, et al. Research Overview of Oil-Paper Composite Insulation Modified by Nano Particles for Transformer [J]. Transactions of China Electrotechnical Society,2023,38(9):2464-2479,2490.
[2] 赵洪山,常杰英,曲岳晗,等. 基于二元非线性Wiener随机过程的变压器油纸绝缘剩余寿命预测方法[J]. 电工技术学报,2023,38(15):4040-4049.ZHAO Hongshan, CHANG Jieying, QU Yuhan, et al. Residual Life Prediction Method of Transformer Oil-Paper Insulation Based on Binary Nonlinear Wiener Random Process [J]. Transactions of China Electrotechnical Society, 2023,38(15):4040-4049.
[3] 张亚杰,杜振斌,刘新颜,等. 天然酯绝缘油在变压器中的应用研究与探讨[J]. 绝缘材料,2023,56(5):69-75.ZHANG Yajie, DU Zhenbin, LIU Xinyan, et al. Application research and discussion on natural ester insulating oil in transformer [J]. Insulation Materials,2023,56(5):69-75.
[4] 邹阳,何津,金涛. 基于NRS和D-S证据理论的变压器油纸绝缘状态评估模型[J]. 电机与控制学报,2021,25(10):89-96.ZOU Yang, HE Jin, JIN Tao. Evaluation model of transformer oil-paper insulation based on neighborhood rough set and dempster-shafer evidence theory [J]. Electric Machines and Control, 2019,25(10):89-96.
[5] ZHANG T , MANDALA A T , ZHONG T ,et al.Identification of extended Debye model parameters for oil-paper insulation based on voltage response characteristic[J].Electrical engineering, 2022,104(4),2379-2387.
[6] BARAL,A,CHAKRAVORTI,et al.Compensating the Effect of Temperature Variation on Dielectric Response of Oil-paper Insulation used in Power Transformers[J].IEEE transactions on dielectrics and electrical insulation: A publication of the IEEE Dielectrics and Electrical Insulation Society, 2016, 23(4):2462-2474.
[7] 饶显杰,周凯,李明志,等. 基于电力电缆绝缘去极化电流的扩展Debye等效电路参数辨识[J]. 高电压技术,2020,46(3):1036-1042.RAO Xianjie, ZHOU Kai, LI Mingzhi, et al. Parameter Identification for Extended Debye Equivalent Circuit Based on Depolarization Current of Power Cable Insulation [J]. High Voltage Technology, 2019,46(3):1036-1042.
[8] 杜林,杨峰,蔚超,等. 基于频域介电谱的油纸绝缘宽频等效模型参数辨识研究[J]. 电工技术学报,2018,33(5):1158-1166.DU Lin, YANG Feng, WEI Chao, et al. Parameter Identification of the Wide-Band Model of Oil-Impregnated Paper Insulation Using Frequency Domain Spectroscopy [J]. Transactions of China Electrotechnical Society,2018,33(5):1158-1166.
[9] 李安娜,蔡金锭. 油纸绝缘等效电路参数辨识与老化评估[J]. 电力科学与技术学报,2014(1):48-54.LI Anna, CAI Jinding. Equivalent circuit parameter identification and aging assessment for oil-paper insulation [J]. Journal of Electric Power Science and Technology,2014(1):48-54.
[10] SAHA T K , PURKAIT P , MULLER F .Deriving an Equivalent Circuit of Transformer Insulation for Understanding the Dielectric response Measurements[J].IEEE Transactions on Power Delivery, 2005, 20(1):149-157.
[11] 邹阳,林锦煌,何津,等. 基于频谱解构法的油纸绝缘扩展德拜模型参数辨识[J]. 电工技术学报,2023,38(3):622-632.ZOU Yang, LIN Jinhuang, HE Jin, et al. Parameter Identification of Oil Paper Insulation Extended Debye Model Based on Spectrum Deconstruction Method [J]. Transactions of China Electrotechnical Society,2023,38(3):622-632.
[12] 邓映鑫. 变压器油纸绝缘介电响应的非线性特性及其时--频域转换方法研究[D]. 重庆:重庆大学,2020.DENG Yingxin. Study on Nonlinear Characteristics of Transformer Oil-Paper Insulation Dielectric Response and Its Time–Frequency Conversion Method[D]. Chongqing: Chongqing University,2020.
[13] XU Q, LIN F, LI H, et al. Acquiring Polarization and Depolarization Current with less Interference by Translating Dielectric Response from Frequency to Time Domain[C]. IEEE Conference on Electrical Insulation and Dielectric Phenomena, Cancun, Mexico, 2018: 326-329.
[14] SAHA T K,. MIDDLETON R, THOMAS A. Understanding frequency time domain polarisation methods for the insulation condition assessment of power transformers[C]. IEEE Power Energy Society General Meeting, Calgary, Canada, 2009: 1-8.
[15] F. YANG, L. DU, L. YANG, et al. Wide-band model for dielectric response of oil-impregnated paper insulation[C]. IEEE Conference on Electrical Insulation and Dielectric Phenomena, Toronto, Canada, 2016: 149-152
[16] 杨峰,唐超,周渠,等. 基于等效电路的油纸绝缘系统受潮状态分析[J]. 电工技术学报,2020,35(21):4586-4596.YANG Feng, TANG Chao, ZHOU Qu, et al. Analyzing the Moisture State of Oil-Paper Insulation System Using an Equivalent Circuital Model [J]. Transactions of China Electrotechnical Society,20,35(21):4586-4596.
[17] 林智勇,张波,张达敏,等. 基于连续型回复电压极化谱的油纸绝缘老化研究[J]. 重庆大学学报,2023,46(11):49-55.LIN Zhiyong, ZHANG Bo, ZHANG Damin, et al. Research on the aging of oil-paper insulation based on continuous return voltage polarization spectrum [J]. Journal of Chongqing University,2023,46(11):49-55.
[18] LI Y , MU H , ZHAO H ,et al.An On-line Insulation Diagnosis Method for Transformer Bushing Based on Frequency Domain Spectroscopy under Transient Voltage Excitation[C]//2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE), Beijing, China, 2020: 1-4.
[19] 林智勇,蔡金锭. 变压器等效电路参数变化对极化谱的影响分析[J]. 电子测量与仪器学报,2014,28(3):292-298.LIN Zhiyong, CAI Jinding. Analysis for influence of transformer equivalent circuit parameters change on polarization spectrum [J]. Chinese Journal of Electronic Measurement and Instrument,2014,28(3):292-298.
[20] MANSOURI M, SAFAVI H R, REZAEI F. An improved MOPSO algorithm for multi-objective optimization of reservoir operation under climate change[J].Environmental Monitoring and Assessment, 2022, 194(4): 261.
[21] 刘珊,丛培杰,吴杰,等. 基于时频域转换的变压器油纸绝缘介质响应检测研究[J]. 自动化技术与应用,2021,40(6):112-116.LIU Shan, CONG Peijie, WU Jie, et al. Research on Response Detection of Transformer Oil Paper Insulation Medium of Based on Time-·frequency Conversion[J]. Automation Technology and Application,2021,40(6):112-116.
[22] 姚欢民,穆海宝,张大宁,等. 基于灰色关联与时-频域介电响应的油纸绝缘受潮状态快速评估方法[J]. 绝缘材料,2023,56(3):54-60.YAO Huanmin, MU Haibao, ZHANG Daning, et al. Rapid evaluation method of oil-paper insulation damp condition based ongrey correlation and time-frequency domain dielectric response [J]. Journal of Insulation Materials, 2019,56(3):54-60.