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二维空间重构电流特征轨迹的变压器差动保护判据
作者:
作者单位:

1.梯级水电站运行与控制湖北省重点实验室(三峡大学),湖北省 宜昌市 443002;2.强电磁工程与新技术国家重点实验室(华中科技大学),湖北省 武汉市 430074;3.国网湖北省电力公司检修公司鄂中运维分部,湖北省 武汉市 430050

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基金项目:

国家自然科学基金资助项目(51677108);三峡大学学位论文培优基金资助项目(2020SSPY061)。


Transformer Differential Protection Criterion Based on Reconstructed Track of Current Characteristics in Two-dimensional Space
Author:
Affiliation:

1.Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station (China Three Gorges University), Yichang 443002, China;2.China State Key Laboratory of Electromagnetic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;3.Central Hubei Division of State Grid Hubei Corporation Maintenance Company, Wuhan 430050, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No.51677108) and Research Fund for Excellent Dissertation of China Three Gorges University(No.2020SSPY061).

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    摘要:

    在故障电流的影响下,变压器差动保护两侧电流互感器(TA)易发生饱和,使传变的电流波形发生畸变,严重影响变压器差动保护的正确动作。针对TA饱和造成的变压器差动保护误动或拒动的问题,对不同故障类型下变压器两侧电流波形相位关系特性进行对比分析,提出将两侧电流进行二维空间重构,应用重构后的特征轨迹构造变压器差动保护新判据,以识别伴随TA饱和的变压器各类故障。通过仿真和动模试验,验证新判据有较高的可靠性和灵敏性,并且具备较强抗TA饱和的能力。

    Abstract:

    Under the influence of the fault current, the current transformers (TA) on both sides of the transformer differential protection are prone to saturation, which would distort the current waveforms of the transformer and seriously affect the correct operation of the transformer differential protection. To solve the problem of misoperation or operation failure of transformer differential protection caused by TA saturation, the phase relationship characteristics between the currents on both sides of the transformer with different fault types are comparatively analyzed. A novel criterion for transformer differential protection is proposed to identify various faults accompanied by the TA saturation, which is based on the two-dimensional reconstruction of currents on both sides and the reconstructed characteristic tracks. The results of simulation and experimental tests indicate that the proposed criterion has high reliability and sensitivity, as well as the anti-saturation ability of TA.

    表 1 Table 1
    图1 不同故障时变压器电流波形Fig.1 Transformer current waveforms with different faults
    图2 不同情况下电流重构后轨迹Fig.2 Reconstructed current tracks with different circumstances
    图3 算例2中电流波形及判据对比Fig.3 Current waveforms and the criteria comparison in case 2
    图4 算例4中电流波形及判据对比Fig.4 Current waveforms and the criteria comparison in case 4
    图5 电流波形及K值计算结果(动模试验)Fig.5 Current waveforms and calculation results of K (dynamic simulation tests)
    图 双绕组变压器模型及参数Fig. Double-winding transformer model and the parameters
    图 保护判据流程图Fig. Flow chart of the protection criterion
    图 动态模拟试验模型Fig. Model of dynamic analog experiment
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引用本文

翁汉琍,贾永波,李振兴,等.二维空间重构电流特征轨迹的变压器差动保护判据[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190612003.
WENG Hanli,JIA Yongbo,LI Zhenxing,et al.Transformer Differential Protection Criterion Based on Reconstructed Track of Current Characteristics in Two-dimensional Space[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190612003.

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  • 收稿日期:2019-06-12
  • 最后修改日期:2020-03-04
  • 录用日期:2019-12-27
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