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With the development of electric power industry, power cable will play a more and more important role not only widely used in distribution network, but also in the field of AC/DC and high voltage transimission system. Power cable is generally underground or underwater, the problem that fault concealment and long time troubleshooting make serious impact on the power supply reliability of power system...
The ultra high voltage current (UHVDC) is the important technical means for the solution of high voltage, large capacity, and long distance power transmission. plusmn800 KV UHVDC transmission technology will be used in the project which transfer hydroelectric power in Yunnan Province and Sichuan Province to Guangdong Province and Shanghai and other east places in China. During the building course...
An adaptive fault line detecting method with correlation analysis using energy ratio is proposed based on the features of big capacitance current and high attenuation speed of hybrid transmission lines following single phase earthed fault. Applying wavelet packet decomposition, characteristic waveband of each zero sequence current can be determined by the theory of maximum energy, which can exclude...
H. Rahman and B. H. Khan have given a new model for simultaneous AC-DC power transmission through a transmission line. This paper model formation to evaluate the reliability of main electrical scheme. Use advanced four state component model, redefined abnormal state and maintainable state, combined maintenance state based on condition of component and schedule maintenance state to maintenance state...
The identification of shielding failure and back striking in transmission lines is always difficult. The process of back striking and shielding failure in UHVAC transmission lines was analyzed in this paper. Because the mechanisms of produced transient zero module current and its propagation paths were different between back striking and shielding failure, their wavelet energy of different frequency...
In resonant grounded power distribution systems, it is difficult to identify the fault line due to weak current and unstable fault arc after single phase-to-earth fault occurring. On the base of analyzing characters of the steady and the transient signal of zero-sequence-current, a new method of fault-line selection by using empirical mode decomposition (EMD) is proposed. Decompose the transient signal...
Power system dynamic stability includes two problems: power angle stability and voltage stability. For the former, the best way is to install power system stabilizer (PSS) on the key generator groups, and for the latter, however, Flexible AC transmission systems (FACTS) devices such as static var compensator (SVC), static compensator (STATCOM) and so on are the popular methods. PSS can effectively...
While the hybrid transmission lines of distribution network occur the single line to ground faults, a fault line detecting method with HHT detective then compare the phase relation based on the phase relation of zero sequence current between fault line and unfault line is reverse. A morphological filter is first developed to filter noise in transient zero sequence currents. Applying HHT detective...
Lightning stroke to transmission lines was introduced in this paper. Modeling and implementation method of tower, corona and insulator for lightning electromagnetic transient research was discussed. Comprehensive model for study of UHVDC lightning electromagnetic transient was built, and lightning caused fault and lightning disturbance were simulated in PSCAD/EMTDC based on the model, which offered...
The ultra high voltage direct current(UHVDC) is the important technical means for the solution of high voltage, large capacity, and long distance power transmission. plusmn 800 KV UHVDC transmission technology will be used in the projects which transfer hydroelectric power in Yunnan Province and Jingshajiang river to Guangdong Province and Shanghai and other places in China. Along with the rapid development...
A new integrated fault line detecting method using extenics is proposed, for existing methods of fault line detection are affected by fault switching angle and electric arc etc., the accuracy of fault line detection is not satisfied. Three factors of matter-element in single-phase fault line detection are confirmed, which are the possible fault line's aggregate and its correlative characteristic aggregate...
This paper introduce a method of enlarging power transfer capability of electric power corridor connecting to different regions by means of compensation. Different from traditional way to consider voltage stability condition, this paper focus on the influence caused by power transferred in corridor, and this make developing new tool of analysis necessary. A new modified continuous power flow calculation...
As one of the most important equipments to guarantee power gird operating safely and stably, the fault diagnosis of transformer has most important sense. Since the general diagnosis methods such as DGA and attributes' reduction of rough set haven't enough precision for transformer's fault diagnosis, Extenics and rough set theory are brought into diagnosing the fault of transformer. Using attribute...
In this paper, it takes the existing experimental electric power transmission price mechanism to the large power consumers of China as basis, combining the operation status of power market of Yunnan province with the power consuming status of the high energy-consuming enterprises, and then establishes profit model of triple sides, including power plants, power network corporations and large power...
The classical four-state component model haven't accord to practical situation because the equipment repairing technique based on condition of component developed quickly, and this paper put forwarded an advanced four state component model. That model redefined abnormal state and maintainable state, combined repair state based on condition of component and schedule repair state to repair state and...
The reliability can be enhanced by using single-phase reclosing, but when reclose to permanent faults, it is another surge on system. So there is necessity to study on the influence of reclosing sequence on transient stability margin. In the case that transient and permanent fault is not effectively identified, the influence of sequence and time of single-phase reclosing on transient stability margin...
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