Paper Titles
Simulation Analysis for the Impact of Voltage Distribution of Distribution System with Distributed Generation
p.936
State Estimation of Equivalent Current Measurement Transformation Based on Generalized Tellegen's Theorem
p.941
Study on Electric Energy Metering Program under the Impact of Distorted Waveform
p.948
Study on the Power Transformers Deterioration State Evaluation Index System
p.954
The Feasible Analysis of Transformer Fast Reenergizing with Neutral Point Ungrounded
p.958
The Realization of Induction Cooker Power Control Based on Fuzzy Control Theory
p.965
Unbiased Direct DGM(1,1) Model of Non-Homogeneous Exponential Sequence and its Application in Electric Load Forecasting
p.972
Using Phase Shifter and OLTC to Improve Reliability during Load Transferring and System Protection
p.976
Energy Storage Based Adaptive Control of Disturbed Load Interconnected Power Systems
p.981

The Feasible Analysis of Transformer Fast Reenergizing with Neutral Point Ungrounded

Article Preview

Abstract:

The feasibility of transformer fast reenergizing with neutral point ungrounded after the external fault being removed is analyzed in this paper. By calculating overvoltage and discriminating magnetizing inrush current, it analyzes four ways to restore power of transformer and chooses the optimal strategy which is safe and time-saving. The result shows that in the case of transformer neutral point ungrounded, closing the low-voltage circuit side breaker before the high-voltage, which can effectively limit over-voltage in a safe range. The second harmonic characteristic of magnetizing waveform may disappear, while the intermittent angle characteristics are still significant. With the help of the intermittent angle principle, transformer differential protection may not misuse. The average time for each customer interruption is reduced from 40 minutes to 10 minutes and saves an hour for engineer on the way back and forth. It will greatly improve power supply reliability.

You might also be interested in these eBooks
Thermal, Power and Electrical Engineering View Preview

Info:

Periodical:

Advanced Materials Research (Volumes 732-733)

Pages:

958-964

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.732-733.958

Citation:

Cite this paper

Online since:

August 2013

Authors:

Yao Zhao, Yu De Yang, Yan Hong Pan, Le Qi

Keywords:

Grounded Mode, Magnetizing Inrush, Neutral Point, Overvoltage, Transformer

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2013 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] YU Huapeng, CHEN Shuiming, YU Hongqiao, et al. Calculation of Overvoltage on Neutral Point of 110kV Power Transformers and Corresponding Protection Strategy[J]. Power System Technology, 2011, 35(3) : 152(in Chinese).

Google Scholar

[2] X. Lin, et al. The ultra-saturation phenomenon of loaded transformer energization and its impacts on differential protection, , IEEE Trans on Power Delivery, 2005, 20(2) : 1265–1272.

DOI: 10.1109/tpwrd.2004.833919

Google Scholar

[3] H. Weng, X. Lin, and P. Liu, Studies on the operation behavior of differential protection during a loaded transformer energization, , IEEE Trans on Power Delivery, 2007, 22(2): 1386-1391.

DOI: 10.1109/tpwrd.2007.900211

Google Scholar

[4] LIU Zhong-ping, LU Yu-ping , YUAN Yu-bo. Study of Transformer Recovery Inrush After Clearance of External Faults[J]. Automation of Electric Power Systems, 2005, 29(8): 41-23 (in Chinese).

Google Scholar

[5] YANG Gaokui. The discussion of ungrounded main transformer on 110 kV side neutral grounded knife operation[J]. Electric power of Hubei, 2008, 32(6): 30-31(in Chinese).

Google Scholar