Entity

Time filter

Source Type


Gao L.,Shanghai Lightning Protection Center | Ye Y.,Shanghai Qisi Information Technology Co.ltd
2014 International Conference on Lightning Protection, ICLP 2014 | Year: 2014

The calculation of collection area is an important procedure to assess the lightning risk of a structure. There are two kinds of structure: isolated one and non-isolated one. What's the difference between them? How to calculate the collection area of a non-isolated structure? This article describes that and proposes a new method: Volume-Proportion Method (VPM). As a quantitative method from a three-dimensional viewpoint, VPM is the best method to calculate the collection area of non-isolated structures in the world as we know. At last several scenarios are shown to showcase the advantage of VPM. © 2014 IEEE. Source


Wang Q.,Shanghai Lightning Protection Center
2014 International Conference on Lightning Protection, ICLP 2014 | Year: 2014

This paper presents the spatial and temporal distribution of cloud-to-ground lightning over Yangzte River Delta, China for the period 2009-2013. Data collected by the STLDN (Shanghai TS7/8000 Total Lightning Detection Network) was used. The spatial distribution of lightning was calculated in a 5×5km grid. A total of 3,220,775 cloud-to-ground strokes were registered in the area under observation during 2009-2013.The annual mean cloud-to-ground stroke density over the area was 6.29 strokes km-2year-1. The lowest values found were less than 1 strokes km-2year-1 and the highest stokes densities were 19.688 strokes km-2year-1. The monthly distribution of lightning showed the highest activity in august. The spatial distribution showed the relevance with the urbanization degree over Yangtze River Delta region, especially in Shanghai area. © 2014 IEEE. Source


Zhou Q.,Shanghai Lightning Protection Center | Rousseau A.,SEFTIM | Zhao Y.,Nanjing University of Information Science and Technology | Liu F.,Shanghai University of Electric Power | Bian X.,Shanghai University of Electric Power
Electric Power Systems Research | Year: 2015

Surge Protective Devices (SPDs) are widely applied to protect the low-voltage equipment against the surges from direct lightning strikes or the lightning-induced effect. To ensure the protection effect, the users should not only consider the performance and quality of the SPDs themselves, but also the coordination between SPDs and between SPD and the protected equipment. In practice, there may be SPDs with different characteristics from many manufacturers on the same line. One SPD is installed by the contractor in charge of electrical installation and then various panel boards are used in the installation made by various panel builders. All of them may use different brands of SPDs. So it is difficult to evaluate the coordination effect between those SPDs and between SPD and the protected equipment by theoretical analysis. A solution would be to perform the coordination test. This paper provided an investigation on the proposed coordination test method for different configurations with various loads, various cable lengths, various cable enclosures and various surge waveforms through experiments in the laboratory. The sharing current and residual voltage of two cascaded SPDs were measured and discussed. The proposed coordination test method was verified to be informative for achieving successful coordination between SPDs and between SPD and the protected equipment. © 2015 Elsevier B.V. Source


Wang X.,Hong Kong Polytechnic University | Du Y.,Hong Kong Polytechnic University | Chen M.,Hong Kong Polytechnic University | Huang X.,Shanghai Lightning Protection Center
Electric Power Systems Research | Year: 2014

This paper discusses the surge propagation at the discontinuity of a vertical line over the ground. Similar to a traditional transmission line, surge transmission at the discontinuity can be determined by its surge impedances. However, the surge impedances of a vertical line are different from the characteristic impedance of the transmission line. They respond differently to incident, transmitted and reflected waves, and vary with time. In this paper, these surge impedances are discussed in detail, and the methods for impedance evaluation are presented. The formulas of voltage and current transmission coefficients at the discontinuity are presented. A numerical example is presented to illustrate the surge impedances of a vertical line and to verify the formula of the transmission coefficients at the discontinuity. © 2014 Elsevier B.V. Source


Rousseau A.,SEFTIM | Zhou Q.,Shanghai Lightning Protection Center | Zhao Y.,Shanghai Lightning Protection Center
2014 International Conference on Lightning Protection, ICLP 2014 | Year: 2014

There may be SPD from many manufacturers on the same line. One SPD is installed by the contractor in charge of electrical installation and then various panel boards are used in the installation made by various panel builders. All of them may use a different brand of SPDs. A solution would be to perform the coordination tests proposed by the European CLC TS 61643-12 standard. A preliminary paper was presented at ICLP 2012 and this is a further contribution taking care of comments received. © 2014 IEEE. Source

Discover hidden collaborations