Tibor Horváth

Problems and solution of utilizing the protection angle method

The protection angle proved to be suitable for high voltage lines up to now. The standardized method involves much problems and contradictions applying to three-dimensional structures. Therefore, it should be restrictively used as an additional method for design air-termination systems.

The protected space proved to be an undefined term

The protected space is not really protected against penetration of lightning. Probability of interception failure cannot be related to parameters of the protected space without considering the structure to be protected. Therefore, the term “protected space” cannot be exactly defined.

Concept of standardizing the lightning protection of structures

Designing the lightning protection system could be simplified with classification the structure according to danger that determines the required degree of components of the LPS. This could be corrected on the base of result obtained by risk assessment in the case of important structures.

Estimation of interception efficiency using the probability modulated attraction volume

Designing the lightning protection system could be simplified with classification the structure according to danger that determines the required degree of components of the LPS. This could be corrected on the base of result obtained by risk assessment in the case of important structures.

Construction of the protected volume with proper application of rolling sphere method

The aim of the rolling sphere method is to construct the protected volume produced by an air-termination system. Although, its principle is distinct, false application also occurs. This paper advises a procedure for designing the protected volume with the rolling sphere method in the case of complex geometrical conditions too.

Improved method for the evaluation of shielding effect of objects near medium voltage transmission lines

There are several cases when medium voltage lines are running near each other and/or are crossing a high voltage line near a substation. Determination of the severity of lightning strokes at critical sections of the transmission lines is important from the point of a detailed risk calculation. There are different methods used nowadays for that purpose, but most of them are strongly simplified (usually 2D models) and the reliability of their results is limited. Probability Modulated Attraction Volume Method provides a more detailed and accurate analysis possible. Analysis of real 3D arrangements is presented in this paper.

Positioning the down-conductors based on physical conditions

The number and positioning the down conductors have been usually connected to the length of the perimeter of structure. Following this tradition, also the IEC 62305-3 standard applied this method. To avoid the problems of application, the new method limits the resulting horizontal current paths from point of strike to the down conductors.

Risk evaluation for overvoltages due to conductive coupling in atmospheric electrostatics

Abstract The present paper introduces a calculation method for the estimation of the risk of the damage caused by the lightning electrostatic discharge in electronic systems. The major idea of the method is the extension of the strokeless period, which is widely used in the primary lightning protection. It contains a detailed calculation for the probability of occurrence of overvoltage due to lightning electrostatic discharge entering a building through conductive coupling. A general building model was used for the calculation, which can represent industrial buildings, office buildings or a block of houses as well. In practice, a financial decision can be made based on the results of the calculation method.

A new system to solve the problems of positioning the air-termination components

According to IEC 62305-3 standard, there are three methods for adequate positioning the air-termination components. However, the protection angle method has undefined bases and concludes to contradiction. The rolling sphere method is correct; however here are also false applications. The mesh method is related only to quadratic meshes on 100 years old bases. These problems makes necessary to search new ways.