Grounding System Analysis in the Time Domain

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XGSA_TD is a multipurpose Engineering Software for the analysis of conductors network in the time domain taking into account transients with maximum bandwidth up to about 100 MHz including Soil Resistivity Analysis and Fourier Analysis.

XGSA_TD extended the application field of XGSA_FD to the time domain.

GENERAL DESCRIPTION

XGSA_TD is a powerful module which extends the XGSA_FD application field to the time domain.

In this regard, XGSA_FD uses the so called “frequency domain approach”. This approach is rigorous and allows considering the frequency dependence of soil parameters.

As known, a transient can be considered as the superposition of many single frequency waveform calculated with the forward Fast Fourier Transforms (FFT).

Using the frequency domain PEEC model implemented in XGSA_FD it is then possible calculate a response for each of these single frequency waveform.

The resulting time domain response can be obtained by applying the Inverse Fast Fourier Transform to all these responses calculated in the frequency domain.

The calculation sequence implemented in XGSA_TD is also called FFT – PEEC – IFFT.

XGSA_TD has been tested for the simulation of transients with a maximum frequency spectrum up to 100 MHz and then can be used for switching transients, lightning and also in fault transients in GIS.

XGSA_TD can consider transients with known equations like Double Exponential, Pulse or Heidler (transients used in EMC studies).

XGSA_TD can also consider transients with arbitrary equations or recorded and then known as a discrete number of samples (transients used in lightning and HV studies).

XGSA_TD includes an option to export frequency dependent self and mutual impedances to EMTP® or ATP® in order to simulate with a rigorous model the dynamic behaviour of large grounding systems during electromagnetic transients.

INPUT DATA (in addition to XGSA_FD)

As for XGSA_FD and moreover:

Maximum calculation frequency used 1, 10 or 100 MHz (1 MHz for switching transients, 10 MHz for lightning, 100 MHz for fast transients like fault transients in GIS)
Parameters of the normalized standard transient function (Double Exponential, Pulse or Heidler functions)
Samples or arbitrary normalized transient functions or recorded transient (copied from EXCEL® files)
Number of critical frequencies (with default or customized selection)

OUTPUT RESULTS

XGSA_FD provides the time domain distribution and the frequency spectrum of the input transient (with linear and Log – Log scale plot).

XGSA_TD results are as for XGSA_FD but in the time domain.

Calculations of soil surface potentials, touch and step voltages, electric and magnetic fields are possible along lines.

XGSA_TD includes an option to export frequency dependent self and mutual impedances to EMTP® or ATP® in order to simulate with a rigorous model the dynamic behavior of large grounding systems during electromagnetic transients.

It is possible to represents:

The time domain distribution of leakage current, longitudinal current, potential, electromotive force and complex power in each point on the electrodes with 1D representation
The time domain distribution of soil surface potentials, touch and step voltages, electric and magnetic fields in each point of a line calculation
The distribution of soil surface potentials, touch and step voltages, electric and magnetic fields along an entire line calculation at a fixed time
The animation of the time domain distribution of soil surface potentials, touch and step voltages, electric and magnetic fields along an entire line calculation

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Tags: Grounding and Earthing Analysis, Grounding Systems, Earth Resistance, Touch and step voltages, Soil modeling, Lightning protection, Soil ionization, impulse impedance

Grounding System Analysis in the Time Domain

GENERAL DESCRIPTION

INPUT DATA (in addition to XGSA_FD)

OUTPUT RESULTS

MAIN FEATURES

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