Name / Andreas Sumper / Session / 2
Company / Citcea DEE UPC / Block / 1
Address / Av. Diagonal, 647. Pavelló A / Question n° / 2.3 and 2.4
08028 Barcelona, Spain / Language used on the floor / German
Phone / +34 93 401 67 27 / Accompanying visuals on file ? / No
e-mail /
Direct and indirect lightning(Question 2.3)
This section intents to answer the question 2.3, if the in the article presented formulas are in good agreement with the modern computation techniques.There are several investigations, introducing modern computation techniques for the determination of the direct and indirect lightning overvoltages, for example[1]. In our article, we considered, due to the statistical nature of the input parameters, that the used formulas [2], [3] are good approximations to obtain the overvoltages due to lightning. Moreover, the results of these formulas lead to an overestimation of the indirect lightning overvoltages [4], whichmakes our case to a worst case consideration. It is to take in account, that nearby shielding effects were not considered, which results also in an overestimation of the obtained results.
EMTP/ATP vs. Matlab (Question 2.4)
Due to the great calculation capabilities of Matlab, it is absolutely possible to use Matlab for transient simulations for power systems. The Advantages of EMPT/ATP over Matlab can be resumed by the following list:
- Graphical user interface of ATP (ATP-Draw)
- Tested algorithm
- No software purchasing costs
- A great number of users, congresses and Internet Usegroups
On the other hand, Matlab has the possibility to embed every algorithm, and this leads to an increase of the flexibility of the user application. However, increased programming using Matlab leads to an increased code developing time.
In our case we used EMTP/ATP because of the above mentioned advantages.
References:
[1]González Molina, F.; Evaluación estadística del comportamiento de líneas aéreas de distribución frente a sobretensiones de origen externo; PhD Thesis,Barcelona, 2001, Politecnican University of Catalonia
[2]Porrino A. (Joint Cired/Cigre Working Group 05); Protection of MV and LV Network against Lightning. Part I: Basic Information; 14th International Conference and Exhibition on Electricity Distribution, Part 1, Subject area 2: Disturbances and overvoltages; IEE Press; 1997; 2.21.1-2.21.7
[3]Porrino A. (Joint Cired/Cigre Working Group 05); Protetion of MV and LV Network against Lightning. Part II: Application to MV Networks, 14th International Conference and Exibition on Electricity Distribution, Part 1, Subject area 2: Disturbances and Overvoltages; IEE Press; 1997; 2.28.1-2.28.8
[4]Matsuo, N. M.; Zanetta L. C.; Frequency of occurrence of lightning overvoltages on distribution lines, 14th International Conference and Exibition on Electricity Distribution, Part 1, Subject area 2: Disturbances and Overvoltages; IEE Press; 1997; 2.28.1-2.28.8