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Shang S.,Hunan University | Luo Y.,Hunan University | Luo Y.,Foshan Electrical Power Design Institute Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2011

In this research program the masonry-mortar interface shear test was conducted for 16 composite mortar strengthened masonry specimens to study the masonry-mortar interface shear strength, shear failure mode and the load-slip curve. Test results indicate that the interface shear strength can be increased significantly by using shear pins. The interface shear strength can be increased along with the increase of area of shear pins used. Shear pins can change the failure mode of interface and enhance the ductility of the interface. Embedment depth of the anchorage is another main factor that affected the shear strength and failure mode. The minimum anchorage embedment depth of masonry should be 10d. Interface agents have a negative impact on the interface shear strength. It is suggested that interface agents should not be used in masonry strengthening. The formula predicting the shear strength of masonry-mortar interface is established considering the embedded area based on the experimental results. Source


Liu C.,Foshan Electrical Power Design Institute Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

The definition and the main features of active distribution network (ADN) are introduced, the new technologies and the key design factors of active distribution networks are stated, the necessity and the feasibility to integrally design active distribution networks are clarified, and an integrated design method is proposed. In order to get the optimized scheme of active distribution network, "step-by-step progressing" strategy and "one-step-one-feedback" correction method are used in proposed integrated design method. The main circuit connection modes, the distributed generation systems, the data acquisition devices, the communication system, the protection devices, the automation of distribution network, the operation dispatching system, and the implementing conditions are included in the optimized scheme. The design flow is introduced in detail. ©, 2015, Power System Protection and Control Press. All right reserved. Source


Liu G.,South China University of Technology | Xu B.,South China University of Technology | Ji Y.-F.,Foshan Electrical Power Design Institute Co. | Gao Y.-P.,South China University of Technology | And 2 more authors.
Gaoya Dianqi/High Voltage Apparatus | Year: 2012

In order to more effectively understand the difference among protection performances of the power towers in different terrains, the lightning frequency distributions on the power towers in three different terrains in the Pearl River Delta is analyzed. A statistical model of regional lightning is established to obtain lightning data. The lightning distribution of 10 years in the three terrains in the Pearl River Delta is statistically analyzed based on the lightning location system. The results show that the frequency of lightning stroke in mountain terrain is slightly higher than that in plain construction zone; though the towers in plain construction zone are protected by the near tall buildings, the number of lightning in this region is larger than the number in plain vegetation zone. The statistics indicate that the growth rate of the lightning number increases significantly in plain construction zone, but decreases in either mountain zone or plain vegetation zone. Moreover, a software for electric field simulation is used to analyze the field distributions around the towers in the three terrains, and the result verifies the reasonability of the proposed statistical method. Source


Zhang Y.,Guangdong Electric Power Research Institute | Yang F.,Guangdong Electric Power Research Institute | Zeng J.,Guangdong Electric Power Research Institute | Zhang B.,Foshan Electrical Power Design Institute Co. | Liang T.,Foshan Electrical Power Design Institute Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

Active distribution network (ADN) mode is a technology to optimize the usage of distributed energy resources. Considering the generation benefit cost of distributed generation and its impact on the power grid when assessing the injected solutions of distributed generation into the active distribution network, and considering the reduction of emission targets of the distributed generation, this paper builds a low-carbon optimization objective function model. To avoid human subjectivity too strong when assigning the index weight, according to the 1-9 scale theory, it forms a judgment matrix through the consistency check and gets the reasonable weighting factor. Secondly, to reflect the trends of each indicator and have a certain degree of distinction, it uses membership function for each index value membership, and weights the effectiveness of each membership value corresponding to the weight. Finally, the optimization studies of IEEE14 system is carried out based on GA algorithm, the results show that the proposed low-carbon optimization model is reasonable and effective. ©, 2015, Power System Protection and Control Press. All right reserved. Source


Liu G.,South China University of Technology | Xu B.,South China University of Technology | Ji Y.-F.,Foshan Electrical Power Design Institute Co. | Gao Y.-P.,South China University of Technology | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2011

For the pollution of frequency electric field on the high-rise building caused by the nearby high voltage transmission line, the measures scheme to limit the power frequency electric field value was analyzed. In this paper, with a 220 kV high voltage line across the building section as an example, firstly, this paper adopts 3 kinds of measures, including erecting shielding wire, shielding net, and houses balcony place erected shielding net that also can be regarded as network security. Then by the simulation of electric field to analysis electric field intensity distribution on the ground 1.5 m high and the outer edge of the building (especially the balcony or corridor). Simulation results show that: these measures can reduce the high-voltage electric field strength near the building. Secondly, simulation experiment was used to verify the validity of simulation, then by comparing the shielding effect of three kinds of measures, advantages, disadvantages and application. Finally, inhibition of power frequency electric field obtained relatively good effect that is erecting shielding network holds concurrently do network security in residential high-rise balcony. The shielding effect reduced to the original 7.4%~59.9%, better than the shield, behind shielded net. But the project is easy to implement, easy to maintain, which makes it a better option. Source

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