諧波對過電流電驛特性的影響分析

Impact Analysis of Harmonics upon the Characteristics of Overcurrent Relays

岳吉剛(Yue-Jie Gang)

指導教授 ： 洪穎怡 ； 洪穎怡

中原大學/工學院/電機工程研究所/碩士(2002年)

https://doi.org/10.6840/cycu200200383

摘要

近年來由於工業與科技的進步，非線性設備使用激增，隨其而產生的大量諧波回流到電力系統，使得電力系統電壓和電流發生畸變的情況與日俱增，此即謂諧波污染，當系統受諧波污染時，原先的保護設備可能無法提供完善的保護，甚而造成錯誤動作，因此有關諧波對保護設備的影響分析是有其必要性。
　　本論文針對諧波對過電流電驛影響加以分析探討，並以ELGAR Smart Wave SW5250輸出正弦波及分別含有到3次、5次、7次、9次諧波成份之電源，加入過電流電驛，來測試於不同之過電流時桿標置下時間－電流特性的變化情況。藉由本研究及實測之分析，期能提供有價值的參考依據作為電驛使用者設定之考慮，亦可考慮於電驛內部加裝低通濾波器濾除諧波成份，以降低過電流電驛誤動作的發生。

關鍵字

諧波產生器 ； 電驛 ； 諧波

並列摘要

Due to the improvement of industries/technologies and the increase of nonlinear facilities, large harmonic currents injecting into the power lead to the distortions of the voltages and currents. This is the namely harmonic pollution. The protective relay cannot function properly and may be mal-functional while the system is polluted. Therefore, the impact analysis of harmonics upon the protective relays is essential.
This thesis analyzes the impact of harmonics upon the overcurrent relays. “ELGAR Smart Wave SW5250 “ is used to generate the fundamental wave, 3rd, 5th, 7th, and 9th harmonics to the overcurrent relays in order to examine the characteristics of time vs. current. It is expected that the test results may provide a valuable reference to users who work on the relays. It is suggested that the internal part of the relay may be considered to be installed a low-pass filter for eliminating harmonics and reducing the possibility of relay malfunctions.

並列關鍵字

Relay ； Harmonics ； Harmonics Wave Generator

參考文獻

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[10]IEEE Std. 519-1992, “IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems”, New York, April 1993.