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In recent years, the manufacturing industry of distribution transformer (DT) in China has developed rapidly with high competition. Since the pass rates of National Surveillance Sampling in China (NSSC) for DTs keep a low level, the quality is worried. During the 13th Five-Year Plan period, the investment of distribution network construction will reach 1.7 trillion RMB, which makes a big market for...
In recent years, the manufacturing industry of distribution transformer (DT) in China develops rapidly with high competition. The DTs with aluminum winding replaced by copper winding has been appeared, which increases the risk of security and stability operation for power grid. It is significance to study on winding material identification method, which can guarantee the benefit of the investor, and...
In recent years, the manufacturing industry of distribution transformer (DT) in China develops rapidly with high competition. Since the pass rates of National Surveillance Sampling in China (NSSC) for DTs keep a low level, the quality is worried. During the 13th Five-Year Plan period, the investment of distribution network construction will reach 1.7 trillion RMB, which makes a big market for DTs...
Over the past decade years, China has seen rapid development in HVDC technologies with the world highest operational voltage of ±800kV commissioned in 2010. By 2013, there are more than 24 HVDC transmission projects commissioned or in operation across China to facilitate bulk transfer of power from western and northern parts of the country to the load centres in the central or eastern regions. A majority...
Power transformer is one of the key equipment of power grid. The quality defects of power transformer are inevitable for the long cycle manufacturing period with complex technology and artificial factors, which will affect the safety and stability operation. It has great significance to study on quality risk assessment of power transformer. With the manufacturing supervision information source, the...
In recent years, the government sampling test pass rates of the DT were not high. The quality of the DT was worried, which brings serious risks to the security and stability operation. It has important significance to study on effective quality control method of the DT. The main quality defects and reasons of the DTs during the sampling test are introduced. The sampling test theory is studied based...
Large-capacity wind power will have impact on transmission line protection and auto-reclosing when short circuit occurs. This paper analyses the characteristics of wind farm model and the influences of wind power to transmission line differential protection as well as its auto-reclosing, then proposed countermeasures to meet and overcome the problem.
Static Synchronous Series Compensator(SSSC)which is regarded as a newly developed FACTS equipment with extensive applying prospects has received more and more attentions recently. This paper has adopted three single phase of cascaded converter as the main circuit of SSSC and SVPWM based on KL coordinates as the modulation algorithm. Considering the characteristics of main circuit structure and SSSC...
Overhead transmission line is one of the basic elements of power systems, whose parameters are of great importance to the normal operation of the power system. Thereby how to acquire the accurate parameters of overhead transmission lines is crucial. In this paper a novel method to identify the transmission lines' parameters on-line is deduced, where the data from PMU/WAMS (phasor measurement unit/wide...
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