On the Selection of Bypassing Schemes Affecting the Secondary Arc Current and TRV in Series Compensated Lines

2012 ◽  
Vol 13 (5) ◽  
Author(s):  
Zeynab Zandi ◽  
Keyhan Sheshyekani ◽  
Ebrahim Afjei
Keyword(s):  
Transmission Lines ◽  
Frequency Domain Analysis ◽  
Capacitive Coupling ◽  
System Stability ◽  
Single Line ◽  
Arc Model ◽  
Ground Fault ◽  
In Series ◽  
Arc Current ◽  
Recovery Voltage

Abstract This paper investigates the effect of different bypassing schemes and grounding methods on the secondary arc current and the transient recovery voltage (TRV) of series compensated transmission lines. It is known that in series compensated lines, the peak value of the TRV may exceed the insulation strength. Furthermore, a secondary arc current is generated during a single line to ground fault mainly affected by the capacitive coupling between the healthy lines and the faulted line and can persist for seconds. The steadiness of secondary arc current prevents line reclosers from having a prompt closing to fulfill the system stability. This paper discusses different scenarios that can be employed to limit the secondary arc current consistency and to suppress a severe TRV during a single line to ground fault. A frequency domain analysis is conducted to better understand the nature of the secondary arc current. It is noted that an accurate arc model based upon the Kiziclay’s arc model is used in the simulations.

Study on the characteristics of secondary arc current of UHV high compensation degree TCSC line under the fine-tuning mode

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Baina He ◽  
Yadi Xie ◽  
Jingru Zhang ◽  
Nirmal-Kumar C. Nair ◽  
Xingmin He ◽  
...  
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Stability Margin ◽  
Transmission Capacity ◽  
Fine Tuning ◽  
Series Compensation ◽  
Arc Current ◽  
Compensation Device ◽  
The Stability ◽  
Recovery Voltage

Abstract In the transmission line, the series compensation device is often used to improve the transmission capacity. However, when the fixed series capacitor (FSC) is used in high compensation series compensation device, the stability margin cannot meet the requirements. Therefore, thyristor controlled series compensator (TCSC) is often installed in transmission lines to improve the transmission capacity of the line and the stability of the system. For cost considerations, the hybrid compensation mode of FSC and TCSC is often adopted. However, when a single-phase grounding fault occurs in a transmission line with increased series compensation degree, the unreasonable distribution of FSC and TCSC will lead to the excessive amplitude of secondary arc current, which is not conducive to rapid arc extinguishing. To solve this problem, this paper is based on 1000 kV Changzhi-Nanyang-Jingmen UHV series compensation transmission system, using PSCAD simulation program to established UHV series compensation simulation model, The variation law of secondary arc current and recovery voltage during operation in fine tuning mode after adding TCSC to UHV transmission line is analyzed, and the effect of increasing series compensation degree on secondary arc current and recovery voltage characteristics is studied. And analyze the secondary arc current and recovery voltage when using different FSC and TCSC series compensation degree schemes, and get the most reasonable series compensation configuration scheme. The results show that TCSC compensation is more beneficial to arc extinguishing under the same series compensation. Compared with several series compensation schemes, it is found that with the increase of the proportion of TCSC, the amplitude of secondary arc current and recovery voltage vary greatly. Considering various factors, the scheme that is more conducive to accelerating arc extinguishing is chosen.

Characteristics of Secondary Arc Current on UHV DC and EHV AC Transmission Lines Erected on the Same Tower

2019 ◽  
Vol 20 (5) ◽  
Author(s):  
Yadi XIE ◽  
Baina HE ◽  
Lemiao WANG ◽  
Renzhuo JIANG ◽  
Yuyang ZHOU ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Fault Location ◽  
Coupling Effect ◽  
Time Sequence ◽  
Stable Operation ◽  
Overhead Transmission Lines ◽  
Dc Line ◽  
Arc Current ◽  
Ac Transmission ◽  
Recovery Voltage

Abstract With the continuous expansion of the scale of power system, corridor resources of overhead transmission lines tend to be saturated in China, making AC/DC erection on the same tower a trend in future development. The AC/DC coupling effect will cause DC line to generate secondary arc current at the point of failure when transmission line fails, which affects the DC restart. On account of the mechanism of generating secondary arc current by AC/DC lines erected on the same tower, this paper uses PSCAD to establish simulation model for AC/DC erected on the same tower. And the effects of different fault locations, lengths of coupling sections, and different transposition modes of AC lines on the secondary arc current and recovery voltage of AC and DC lines are studied. The results show that secondary arc current on DC line is greatly affected by fault location and length of coupling line, and using different transposition modes of AC lines can reduce secondary arc current on the DC lines effectively. According to Yunguang UHV DC restart time sequence, setting the restart time sequence can increase the first restart deionization time to ensure the stable operation of the system.

scholarly journals Research on the detection of arc fault in series connection of landscape power supply

2021 ◽  
Vol 2076 (1) ◽  
pp. 012113
Author(s):  
Yi Deng ◽  
Yuanli Li ◽  
Yingpeng Xiong ◽  
Xuewen Zhang
Keyword(s):  
Power Supply ◽  
Wavelet Coefficient ◽  
Reference Value ◽  
Detection Algorithm ◽  
Arc Model ◽  
In Series ◽  
Main Fault ◽  
Arc Current ◽  
Series Type ◽  
Current Zero

Abstract Aiming at the series fault arc phenomenon in landscape lighting and the hidden dangers of electrical fires, in this paper, a landscape power supply series fault arc model is constructed and its model is simulated. The simulation results show that when a fault occurs, the arc current becomes smaller (almost zero) due to the increase in the impedance of the lighting circuit; this phenomenon is called the “current zero off” phenomenon of the fault arc current. The current zero off phenomenon of the fault arc current is the main fault feature in the landscape lighting circuit. In this paper, the wavelet algorithm is used to detect the fault current waveform. According to the fault characteristics, by judging whether the modulus maximum value of the wavelet coefficient has periodic characteristics with an interval of 100±15 sampling points, it is analyzed whether a series-type arc fault occurs. The built physical model verifies the feasibility and correctness of the arc detection algorithm. The research results of this paper have certain reference value for the detection and application of fault arc.

Research of Voltage Sag Propagation through Transformers

2013 ◽  
Vol 706-708 ◽  
pp. 1504-1510
Author(s):  
Xi Nian Li ◽  
Yan Wen Wang
Keyword(s):  
Power Quality ◽  
Transfer Matrix ◽  
Critical Power ◽  
Analytical Calculation ◽  
Single Line ◽  
Voltage Sag ◽  
Symmetrical Components ◽  
Ground Fault ◽  
In Series

Voltage sag is one of the most critical power quality problems. This paper calculates voltage sag propagation through YNd11 and Dyn11 winding connected transformers in series using symmetrical components, thus obtaining the voltage transfer matrix. Then the voltage sag propagation of single line-to-ground fault is computed using the transfer matrix. Simulation result proves the correctness of the analytical calculation, providing reference for the further study of voltage sag influence and estimation.

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