Results 51 to 60 of about 141 (133)
Ain Shams Engineering JournalHigh-Impedance Arcing Faults (HIAFs) in electrical microgrids are among the abnormal conditions that are difficult to detect by conventional protective devices due to low current and non-linear behavior. In addition, the behavioral similarity of HIAFs to
Mohsen Jannati, Hamidreza Toodeji
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بررسی عوامل مؤثر بر اضافه ولتاژ گذرای ناشی از کلیدزنی کلید خلاء در شبکه توزیع و راهکار کاهش شدت آن [PDF]
مجله مدل سازی در مهندسیکلیدهای قدرت از هر نوعی که باشند، به عنوان یک منبع تولید اضافه ولتاژهای گذرا در سیستمهای قدرت شناخته میشوند. در این بین، کلیدهای قدرت از نوع خلاء (Vacuum Circuit Breaker-VCB) اضافه ولتاژهای شدیدتری را نسبت به دیگر انواع کلیدها تولید میکنند.
احمد مرادی +2 more
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Analysis of Magnitude and Rate-of-rise of VFTO in 550 kV GIS using EMTP-RV
Journal of Electrical Engineering and Technology, 2013 Very Fast Transients (VFT) originate mainly from disconnector switching operations in Gas Insulated Substations (GIS). In order to determine the rate-of-rise of Very Fast Transient Overvoltage (VFTO) in a 550 kV GIS, simulations are carried out using EMTP-RV.
Hun-Chul Seo +5 more
openaire +2 more sources
Evaluating the High Frequency Behavior of the Modified Grounding Scheme in Wind Farms
Applied Sciences, 2017 Wind generators are exposed to numerous destructive forces such as lightning and are therefore vulnerable to these phenomena. To evaluate the transient behavior of a wind power plant during direct and indirect strikes, modeling of all relevant components
Seyede Fatemeh Hajeforosh +3 more
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Novel Techniques to Reduce Transformer Inrush Current Using EMTP Software
مهندسی مخابرات جنوبTransformer inrush current is a high-amplitude, non-sinusoidal transient that occurs during initial energization, leading to voltage dips, power quality degradation, and relay misoperations.
Amir Ghaedi +2 more
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Iranian Journal of Electrical and Electronic Engineering, 2016 The article presents the transients analysis of the substation grounding systems and transmission line tower footing resistances which can affect to the back-flashover (BF) or overvoltage across insulator chain in an HV power systems by using EMTP-RV ...
F. Amanifard, N. Ramezani
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Waveform-Level EMT Analysis of Overhead–Cable Transition Effects in Hybrid Transmission Corridors
EnergiesHybrid transmission corridors combining overhead lines and underground cables introduce impedance discontinuities that significantly modify electromagnetic transient behavior.
Luis Salazar Fonseca +6 more
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IEEE AccessThis paper proposes a novel single-ended traveling wave-based fault location method for unearthed overhead lines with a complex topology. The low fault current magnitudes of a phase-to-ground fault in unearthed sub-transmission networks make ineffective ...
Sebastian Dambone Sessa +5 more
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Subsynchronous Resonance and FACTS-Novel Control Strategy for Its Mitigation
Journal of Engineering, 2019 The subsynchronous resonance (SSR) is an important problem in the power system, and especially the series compensated transmission lines may cause SSR in the turbine generators, such that it leads to the electrical instability at subsynchronous ...
Doan Duc Tung, Le Van Dai, Le Cao Quyen
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Gaoya dianqi, 2010 35 kV系统中铁磁谐振过电压频繁发生,对系统造成很大的危害。利用理论分析和EMTP-RV仿真相结合的方法,分析了中国35 kV系统3种中性点接地方式（中性点不接地、经消弧线圈或小电阻接地）下由电磁式电压互感器（PT）饱和引起的铁磁谐振过电压,研究结果表明,在中性点经消弧线圈或小电阻接地系统中,只要消弧线圈或小电阻的参数选取合适,能够将中性点位移电压限制在电压三角形内,可有效抑制铁磁谐振的发生。
汪伟 +6 more
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