Tests of DC Bias Key Performances of Power Transformer With Single-phase Three-limb Core Under No-load and Rated-load Conditions

被引：0

作者：

Zhang S. ^{[1
]}

Wang K. ^{[2
]}

Li J. ^{[3
]}

Sun J. ^{[2
]}

Xie Q. ^{[4
]}

Hu X. ^{[5
]}

Wang X. ^{[6
]}

Ding G. ^{[7
]}

机构：

[1] State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources, North China Electric Power University, Changping District, Beijing

[2] China Electric Power Research Institute, Haidian District, Beijing

[3] State Grid Corporation of China, Xicheng District, Beijing

[4] China XD Group Co., Ltd., Xi'an, 710075, Shaanxi Province

[5] Xi'an XD Transformer Co., Ltd., Xi'an, 710077, Shaanxi Province

[6] National Engineering Research Center for Silicon Steel, Wuhan, 430080, Hubei Province

[7] State Grid Anhui Electric Power Research Institute, Hefei, 230610, Anhui Province

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2019年 / 39卷 / 14期

关键词：

Core vibration; DC bias; Harmonic analysis; Noise; Single-phase transformer; Temperature rise;

D O I：

10.13334/j.0258-8013.pcsee.181832

中图分类号：

学科分类号：

摘要：

To investigate the biased effects on transformer induced by DC current on the neutral point, the characteristic parameters of 110kV transformer with single-phase three-limb core under DC bias were measured and analyzed. The waveforms of voltages and currents show that the excitation current peaks as well as no-load and load losses linearly increase with the augment of DC current, and the increments of losses under the biased load condition agree with that under no-load DC bias. It can be obtained from harmonic analysis that the distortion of the load current under biased load condition is mainly derived from deformation of the applied voltage. The exciting-side current consists of the translated current in the load side and the distorted excitation current due to DC current. Secondly, the transformer noise under DC bias exhibits the trend of initially rapid increase and gradual saturation, which is characterized by the increase of sound pressure level of about 20dB relevant to 36A DC current over the unbiased condition. The noises under rated-load condition are almost 2dB larger than that under the no-load condition. The vibration accelerations of core and the oil-tank surface are significantly increased by DC current. It needs to be mentioned that no specific features relevant to the failure of pressing forces of core clampings are found. Finally, the significant increments of temperature rises of windings as well as metal clampings under DC bias were determined. When the DC current reaches 36A, the hot-spot temperature rises of windings and the upper tie-bar both exceed 90K, and hydrocarbon gases in oil is confirmed. The test results would provide key references for DC endurance ability assessment of transformers under DC bias. © 2019 Chin. Soc. for Elec. Eng.

引用

页码：4334 / 4344

页数：10

共 28 条

[1] Liang X., Zhang P., Chang Y., Recent advances in high-voltage direct-current power transmission and its development potential, Power System Technology, 36, 4, pp. 1-9, (2012)
[2] Shu Y., Zhang W., Research of key technologies for UHV transmission, Proceedings of the CSEE, 27, 31, pp. 1-6, (2007)
[3] Peng P., Zhou W., Xie Y., Et al., Analysis and research on DC bias of transformer caused by metro stray current, Transformer, 54, 11, pp. 26-30, (2017)
[4] Liu W., Zhou W., Ye H., Et al., Research on influence and control measures of metro rail transit on AC network in Changsha, Hunan Electric Power, 37, 1, pp. 7-9, (2017)
[5] Wen X., Guo T., He Z., Et al., Review on the related problems of DC magnetic bias, High Voltage Apparatus, 52, 6, pp. 1-8, (2016)
[6] Patel J.A., Mehta R.S., Rathod S.B., Et al., Analysis of geomagnetically induced current in transformer, International Conference on Electrical, Electronics and Optimization Techniques, pp. 3909-3912, (2016)
[7] Pan Z., Zhang L., Wang X., Et al., HVDC ground return current modeling in AC systems considering mutual resistances, IEEE Transactions on Power Delivery, 31, 1, pp. 165-173, (2016)
[8] Albertson V.D., Bozoki B., Feero W.E., Et al., Geomagnetic disturbance effects on power systems, IEEE Transactions on Power Delivery, 8, 3, pp. 1206-1216, (2002)
[9] Zeng R., Zhang B., Zhao J., Et al., Influence and characteristics analysis of effect of the HVDC ground return current on AC system, High Voltage Engineering, 35, 3, pp. 678-682, (2009)
[10] Kappenman J.G., Radasky W.A., Gilbert J.L., Et al., Advanced geomagnetic storm forecasting: A risk management tool for electric power system operations, IEEE Transactions on Plasma Science, 28, 6, pp. 2114-2121, (2000)

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