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Firstly The calculating formulas for the strength of H-beams with corrugated webs under partial compressive edge loading are summarized. Then, ten specimens were tested to study the failure mode and the bearing capacity, together with the non-linearity finite element method. The results show that the local compressive strength of the beams with corrugated is higher than the beams with plane webs,...
This paper proposes a new partition principle based on bus sequence voltage distribution characteristic for wide area protection system. The influence of short lines, multiple fault and high resistance ground faults are analyzed. Information from multiple points within wide area network is supervised by central station of protection system. Then, suspected faulty zone can be detected according to...
North China Grid (NCG) has been expanding rapidly in the recent years, along with which new issues emerge in system operations. There is an urgent need for NCG to construct and maintain the entire NCG transmission network model according to time points precisely and reliably to deal with those issues. However it becomes difficult to achieve this goal with the conventional centralized modeling method...
The characteristics of double-circuit transmission lines protection are expatiated. Main protection principles and protection configuration schemes of real operating double-circuit transmission lines in China are introduced. Based on the summarize of protection schemes and engineering experiences, the analysis of tripping reasons and measures of wrong trip incidents of the double-circuit transmission...
The protection device is the assurance for high temperature superconducting (HTS) cablepsilas safe operation in power grid. The paper introduces a protection device for HTS cable, which provides both functions of protection and monitoring. In this paper, hardware structure of the protection device and the protection scheme are presented, then a thermal balance model of HTS cable on quench is proposed,...
Ultra-high voltage (UHV) transmission possesses enormous economic benefits and technical superiorities, which is a new subject for China and must be studied emphatically. This paper introduces the actual configuration and parameter of UHV transmission under construction in China and its physical dynamic simulation (PDS) experiment model. According to the structure and operation characteristics of...
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