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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.


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.


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.


Tang H.,Shanghai Lightning Protection Center | Huang X.,Shanghai Lightning Protection Center | Zhou J.,Jiangsu Lightning Protection Center | Zhang X.,Pinghu Lightning Protection Center
2014 International Conference on Lightning Protection, ICLP 2014 | Year: 2014

In the lightning warning area, high lightning risk users were picked out based on lightning forecast products, considering rank of the client evaluated in previous work. When lightning early warning information was issued, probable variation of LX (consequent loss in a structure) and hz(factor increasing the loss when a special hazard is present) of different buildings were systematically studied. A Manufacture Plant was taken as an example, its R1 (risk of loss of human life in a structure) was calculated in circumstance of different lightning protection measures. Rationalization proposals based on the result were put forward, which was meaningful for lightning risk assessment business. © 2014 IEEE.


Bian X.,Shanghai University of Electric Power | Shi L.,Shanghai University of Electric Power | Zhou Q.,Shanghai Lightning Protection Center | Fu Y.,Shanghai University of Electric Power
Gaodianya Jishu/High Voltage Engineering | Year: 2016

The sub-synchronous oscillation (SSO) in the form of sub-synchronous control interaction (SSCI) may appear under small perturbation while doubly fed wind induction generator (DFIG) is connected to power grid via series compensation. The variation of the system operating conditions will affect the SSCI. Considering the random uncertainties of wind farm output, synchronous generators output, and stochastic fluctuations of loads in the power system, we applied a probabilistic method for the first time to study SSO statistical attribute in the system with the wind farms integrated under multi-operating conditions, and utilized participation factors to analyze the SSCI modes. Based on the additional damping controller of static var compensator (SVC), a suppression measure against SSCI is proposed to study the damping torque which is provided to the corresponding oscillation modes for improving the damping character in the system. Time domain simulation and probabilistic sub-synchronous stability research are illustrated based on a test system with DFIG-based wind farm integrated. The results show that SVC in the presence of an additional damping controller can provide extra damping for the system oscillation modes, the probabilistic density function of damping constant moves to the left-half plane, and the value of probabilistic damping ratio is increased greatly, which means the dynamic stability is much improved. The effectiveness of the sub-synchronous suppression measure is also verified by the results of the time-domain simulation. © 2016, High Voltage Engineering Editorial Department of CEPRI. All right reserved.


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.


Huang X.,Shanghai Lightning Protection Center | Zhou Q.,Shanghai Lightning Protection Center
Advanced Materials Research | Year: 2012

This paper presented a numerical evaluation of the lightning electromagnetic environment inside a typical telecommunication building when a lightning strikes at its lightning protection system (LPS). A model based on 'circuit approach' was constructed to simulate the building reinforced steel structure. Through numerical simulation, the magnetic field inside the building for two different types of LPS and for two typical lightning stroke positions was evaluated and compared. From the analysis result, some advices were proposed to protect electronic equipment against the impact of the magnetic field. © (2012) Trans Tech Publications, Switzerland.


Wang Q.,Shanghai Lightning Protection Center | Huang X.,Shanghai Lightning Protection Center | Xu X.,Shanghai Lightning Protection Center
Journal of Natural Disasters | Year: 2012

The Shanghai TS7/8000 total lightning detection system of Shanghai Meteorological Bureau (SMB) is a composition of one newly introduced LS8000 sensor and three LS7000 sensors together with the existing SAFIR3000 system. Completion of the new system enlarged the lightning detection range, and improved the lightning detection efficiency and accuracy. The lightning data from Shanghai TS7/8000 system has been used in real-time lightning monitoring and early warning, short-time weather forecast, lightning risk assessment and lightning disaster investigation. As the first TS7/8000 total lightning detection system in China, Shanghai total lightning detection system would play an important role in meteorological disaster reduction and people ' s life and property protection in Shanghai Municipality.


Huang X.,Shanghai Lightning Protection Center | Zhou Q.,Shanghai Lightning Protection Center
2011 7th Asia-Pacific International Conference on Lightning, APL2011 | Year: 2011

This paper compared the newly-published IEC standards, IEC 61643-11: 2011 «Low-voltage surge protective devices - Part 11: Surge protective device connected to low-voltage power systems - Requirements and test methods», with the old version standard IEC 61643-1:2005. The significant changes in the content and the corresponding cause were presented in this paper. With this paper, the SPD manufacturers, SPD testing laboratories and SPD users could learn the changes in the new standard and grasp new requirements and test methods quickly. © 2011 IEEE.


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.

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