ELECTROMAGNETIC SIMULATION FOR POWER, GROUNDING AND LIGHTNING PROTECTION SYSTEMS
XGSLab is one of the most powerful software of electromagnetic simulation for power, grounding and lightning protection systems and the only software on the market that takes into
account IEC, EN and IEEE Standards in grounding system analysis.
XGSLab includes the modules:
GSA (GROUNDING SYSTEM ANALYSIS) for basic application with underground systems
GSA_FD (GROUNDING SYSTEM ANALYSIS in the FREQUENCY DOMAIN) for general applications with underground systems
XGSA_FD (OVER AND UNDERGROUND SYSTEM ANALYSIS in the FREQUENCY DOMAIN) for general applications with overhead and underground systems
XGSA_TD (OVER AND UNDERGROUND SYSTEM ANALYSIS in the TIME DOMAIN) for general applications with overhead and underground systems
XGSLab integrates the module SRA (SOIL RESISTIVITY ANALYSIS) and XGSA_TD integrates also the module FA (FOURIER ANALISYS direct / inverse).
The XGSLab application field is so wide because the implemented model is for general use and solves the Maxwell equations in non stationary conditions taking into account the earth
lack of homogeneity by the Green functions, the earth reaction by the Sommerfeld integrals and moving from the frequency to the time domain by means the Fourier transforms.
All modules are integrated in an “all in one” package and based on a hybrid calculation method (or “PEEC” method) which considers transmission line, circuit and electromagnetic theory
combined into a single calculation model. Hybrid methods join the strong points of the other methods and are well suited for engineering purposes because they allow the analysis of
complex scenarios including external parameters such as voltages, currents and impedances. For these reasons, XGSLab can be considered a real laboratory.
All algorithms implemented in XGSLab are highly efficient in terms of computation speed and has been validated and tested by many Customers in the world.
XGSLab is easy to use by engineers who need not to be necessarily experts in the specific field, and moreover accurate, stable and fast.
GSA - GROUNDING SYSTEM ANALYSIS
GSA is a widely utilized and recognized module for earth grid calculations and design including soil resistivity analysis. GSA is based on the equipotential condition of the electrodes and
can analyse the low frequency performance of grounding systems composed by many distinct electrodes of any shape into a uniform or multilayer soil model. GSA can import earth grid
data from “dxf” files, delivering professional numerical and graphical output useful for investigation of GPR and leakage current, earth potential, touch and step voltage distributions.
GSA_FD - GROUNDING SYSTEM ANALYSIS in the FREQUENCY DOMAIN
GSA_FD is a module for earth grid calculation and design in the frequency domain, including soil resistivity analysis and represents the state of the art of grounding software.
GSA_FD is also useful for magnetic field and electromagnetic interference evaluations.
GSA_FD adopts a rigorous approach to the study of very large grounding systems where experience shows that the horizontal variations of the soil resistivity makes inefficient
sophisticated soil models (multilayer). In these cases, an accurate electric model of the electrodes including self and mutual impedances is fundamental. These parameters can be
known with greater certainty than the soil resistivity because in the frequency range we are interested in, these parameters depend weakly on the soil properties. Moreover, taking into
account self and mutual impedance effects, allows to overcome the equipotential condition of the electrodes on which standard GSA is based. This allows the analysis of electrodes
whose size are comparable with the wavelength as better specified in the following.
A few competitors take into account self impedance and a very few competitors consider the mutual impedance effects and this can lead to significant errors in calculations. With the
equipotential condition hypothesis, the maximum touch voltage is widely underestimated and this may result in grounding system oversizing with additional cost sink even 50%.
Neglecting the mutual impedances can lead to errors over the 20% in calculations. GSA_FD can allow a significant cost saving in grounding system construction and materials.
GSA_FD can be used in the frequency domain range from DC to 10 MHz and then the calculation accuracy gradually decreases but results are often reliable over 10 MHz.
GSA_FD takes into account the frequency dependence of soil parameters and allows setting the used model.
GSA_FD can analyse grounding systems composed by many distinct electrodes of any shape, size and kind of conductor (solid, hollow or stranded and coated or bare) into a uniform,
multilayer or multizone soil model. Similarly to GSA, GSA_FD can also import earth grid data from “dxf” files delivering professional numerical and graphical output useful for investigation
of GPR and potential, current, leakage current, earth potential, touch and step voltage distributions.
In DC conditions GSA_FD is a good tool for cathodic protection and anode bed analysis with impressed current systems.
GSA_FD can also calculate magnetic fields due to grounding systems or cable, and electromagnetic interference (induced current and potential due to resistive, capacitive and inductive
coupling) between grounding systems or cable and pipeline or buried electrodes in general.
XGSA_FD - OVER AND UNDERGROUND SYSTEM ANALYSIS in the FREQUENCY DOMAIN
XGSA_FD extends the GSA_FD application field to the overhead systems.
XGSA_FD can also manage catenary conductors and bundle conductors too and can take into account sources where potential or leakage current and longitudinal current are known
and independent by other conditions. For these reasons XGSA_FD is probably one of the most powerful and multipurpose tools on the market for these kind of calculations.
In addition to GSA_FD, XGSA_FD can calculate electromagnetic fields and interference between over and under ground systems (for instance between overhead or underground power
lines and installation as pipelines, railways or communications lines) and also the fault current distribution. Electric and magnetic fields are calculated by means the Jefimenko’s
equations and then taking into account the propagation effects.
XGSA_FD calculation model is directly derived from GSA_FD and its application limits can be considered the same.
XGSA_TD - OVER AND UNDERGROUND SYSTEM ANALYSIS in the TIME DOMAIN
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 Fourier transforms. Using the frequency domain 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 Fourier
transform to all these response.