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Substation grounding system of Provincial Electricity Authority (PEA) are normally designed using CDEGS software. However, the copyright and limited user licenses affect the practical use. Therefore, using an alternative software should be more beneficial and cost-effective. MATLAB, an engineering software, has been utilized in this study to design the substation grounding system of non-uniform soil...
The paper investigates the seasonal variation and its impact on the vital parameters and thereafter suggesting a suitable grounding technique to neutralize this seasonal influence. The influence of rainy season on Indian soil condition has been studied numerically with the help of software module. The dip in soil resistivity during raining season significantly reduces the step and touch voltage, which...
When measuring the ground impedance of an electrically isolated grounding system, it sometimes happens that the test electrodes are placed at considerably greater distances from the installation under test than the maximum electrode spacing used during the soil resistivity measurements carried out during the predesign phase of the grounding system. As a result, ground impedance measurements carried...
This paper deals with the calculation of ground resistance, surface voltage, touch voltage and step voltage, to mesh with horizontal wires arranged in different angles. The mathematical modeling is based on the method proposed by Heppe, which allows obtaining the grounding parameters for soil stratified in two layers. Moreover, the results obtained by the Variable Currents Method (VCM) have been compared...
A connection between a phase conductor and the ground in MV networks is called earth fault. The fault current in this case does not depend on the point of the fault, but only on the total capacity (size) of a network. Distribution system operator (DSO) sometimes needs to operate the large network which means operating of the network with big capacitive current (in Czech Republic more than 800A). This...
Nowadays Wind turbines are used over a wide area as they are environmentally favorably means to product energy without emissions and moreover the fuel is wind which is free for use. Wind turbines are often installed in mountainous area where the soil resistivity and isokeraunic level is high. When the soil resistance is high, the potential rise caused by lightning strike to a wind turbine is more...
Distribution system operator (DSO) sometimes needs to operate the large network which means operating of the network with big capacitive current (in Czech Republic more than 800A). This operation puts the emphasis not only on the setting of the earth fault relays but on the safety of the point of fault too. The paper describes the theoretical analysis, simulation and tests in real compensated distribution...
The Yangtze River Bridge studied in this paper is a three-tower steel concrete structure cable stayed bridge with two sides steel cable, composite girder cable stayed bridge and the largest span between towers in the world. The lightning density at the bridge site is much higher than the average value of Wuhan city, so it is important to access the lightning safety. This paper analyzes the lightning...
Step and touch voltage are two main parameters of a grounding system. Common way to reduce these two factors is using distributed mesh network under ground of substation, but wind turbines grounding system are different and limited area. In this paper, the wind turbine grounding system will be analyzed and step and touch voltage will be obtained. For this purpose, CYM software is used analyze a real...
Because of the necessity to perform maintenance on one of the circuits of the high and very high tension double circuit lines that have one of the circuits operational, a case that lately becomes more frequent, the calculation of the currents and induced tensions in the circuit's conductors that is under induction is required to establish safety working conditions. This paper does not intend to modify...
In this paper different grounding systems of wind turbines will be proposed. For each grounding system the step and touch voltage will be obtained and the entire grounding system will be analyzed by boundary element method. The paper introduces a new grounding system which decreases the step voltage, touch voltage and grounding resistance. The MATLAB is used for programming and simulation of the proposed...
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