XGSLab Software

Electromagnetic Simulation For Power, Grounding and Lightning Protection Systems

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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.

The modules GSA, GSA_FD, XGSA_FD and XGSA_TD integrate the module SRA (Soil Resistivity Analysis) and XGSA_TD also integrates the            module FA (direct / inverse Fourier Analysis).

The application field of these four modules is wide because they are based on the PEEC (Partial Element Equivalent Circuit)  method, a numerical method for general applications powerful and flexible and perfectly suitable for engineering purposes.

The implemented PEEC method solves the Maxwell equations in full wave conditions taking into account the Green functions for propagation, the Sommerfeld integrals for the earth reaction, the Jefimenko equations for electric and magnetic fields and moving from the frequency to the time domain by means the Fourier transforms.

This method allows the analysis of complex scenarios including external parameters such as voltages, currents, and impedances. 

These four modules can import data from “dxf” files, and also export data and results in “dxf” files with a full interactivity with CAD tools.

The module NETS is based on the phase components method and integrates specific routines for the calculation of the parameters of lines, cables and transformers.

The module SHIELD is based on a 3D graphical application and consider the most diffused algorithm for the evaluation of the protected volume from lightning strokes.

All modules are integrated in an “all in one” package and provide professional numerical and graphical output useful to investigate any electromagnetic greatness.

All algorithms implemented in XGS are highly efficient in terms of computation speed and have been validated and tested by many Customers in the world.

XGS is easy to use by engineers who need not to be necessarily experts in the specific field, and moreover accurate, stable and fast. 

GSA is based on a PEEC static numerical model and to the equipotential condition of the electrodes and can analyse the low frequency performance of grounding systems composed by many distinct electrodes of any shape but with a limited size into a uniform or multilayer soil model.

GSA can take input data in the form of either graphical (from “dxf” files or from the integrated CAD) or numerical and render powerful graphical facilities via it’s optimised and validated computation algorithms, thus making it an indispensable tool for grounding system design
and verification.

GSA includes the module SRA to calculate uniform or multilayer soil model parameters starting from measured soil resistivity data. GSA is essentially a low frequency tool but in several practical cases (with little electrodes), it can be also useful to calculate the impulse impedance of electrodes under lighting currents with an accuracy level adequate for many engineering applications.

Tags: ieee 80en 50522earthing system designearthing softwaregrounding softwaregrounding system design

GSA_FD is based on a PEEC full wave numerical model and can be applied in general conditions with 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 in a large frequency range from DC to about 100 MHz. It is moreover important to consider that GSA_FD cantakes into account the frequency dependence of soil parameters according to many models including Messier, Visacro – Portela, Visacro – Alipio and the model with a general consensus indicates in the CIGRE TB 781 2019. The raphical (from “dxf” files or from the integrated CAD) and numerical input data, the optimised and validated computation algorithms, the powerful graphical facilities render GSA_FD an indispensable tool for grounding system design and verification, when the drop voltage on conductors cannot be ignored.

GSA_FD includes the module SRA to calculate uniform or multilayer soil model parameters starting from measured soil resistivity data. GSA_FD can also consider a multizone sol model. A multizone soil model should be used when the size of the conductor’s network is so large than the horizontal soil resistivity changing are more significant than vertical variations. GSA_FD is one of the most powerful and general software on the market for grounding system analysis and can be used to solve electromagnetic compatibility or interference problems due to resistive, capacitive and inductive coupling in the earth.

GSA_FD is also useful to calculate magnetic field due to grounding systems or buried cables and can be used to investigate the effectiveness of passive loop mitigation systems.

In DC conditions, GSA_FD can be used for the cathodic protection and anode bed analysis, with impressed current systems involving extensive coated and uncoated buried structure.

Tags: cathodic protection designcathodic protectionsubstation grounding designfrequency domaingrounding system design 

XGSA_FD extends the GSA_FD application field to the overhead systems. Also XGSA_FD is based on a PEEC full wave numerical model and can be applied in general conditions in the same frequency range of GSA_FD. XGSA_FD can also manage catenary conductors and bundle conductors too and can consider sources where potential or leakage current and longitudinal current are forced and independent by other conditions. For these reasons XGSA_FD is probably one of the most powerful and multipurpose tool on the market for these kind of calculations. In addition to GSA_FD, XGSA_FD can calculate electromagnetic fields and interferences between over and underground systems (for instance between overhead or underground power lines and installation as pipelines, railways or communications lines). XGSA_FD integrates a powerful tool for the evaluation of the corona effects (power losses and radiofrequency interferences).

Tags: Eriksson method, Rolling Sphere methodcorona effects evaluationMulticonductors
network solver
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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 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.

Tags: Eriksson method, Rolling Sphere methodcorona effects evaluationMulticonductor network solverEarthing design softwareGrounding design softwarelightning protection designelectromagnetic simulationcathodic protection designearthing system designearthing softwaregrounding softwaregrounding system design

NETS is a very flexible tool able to solve full meshed multi-conductor and multi-phase networks taking into account all the neutral conductors paths as well as the earth path. NETS is based on the phase components method (and then on Kirchhoff laws) and graphs theory for multi-conductor and multi-phase systems. The phase components method is general and overcomes the limits of the classic sequence components method. The sequence component method is well established since 1918, but it can be used only with symmetrical systems or for systems quasi-symmetrical like the common transmission power lines (overhead lines and cables) or transformers. Non-symmetrical conditions could happen, for instance in case of power lines when the phase geometry is not equilateral and transposition is not used. Moreover, the sequence component method cannot be used in case of multiple grounded systems or in case of problems that involve currents to earth.
The phase components method can be used to represent power systems as multi-conductor networks enabling the consideration of non-symmetrical systems also in presence of multiple grounding circuits.
The network components (generators, lines, cables, transformers, loads, switches, faults …) are represented using multi-port cells and the connection between cells is obtained by means of multi-port buses. The grounding systems (substation grids, tower footings …) can be specified in
an arbitrary way. NETS calculates lines, cables and transformers parameters starting on data usually available in commercial data sheet. NETS includes a converter from the sequence domain to the phase domain. This tool can convert sequence impedances matrix to phase impedance matrix. Like the other XGS modules, also NETS has been thought for a use as general as possible. NETS can be used to solve transmission and distribution networks in steady state or fault conditions and to calculate potentials and currents or any kind of short circuit currents with or without fault impedances.
In particular, NETS can be used for the calculation of the fault currentdistribution in power networks and between power circuits and earth. An accurate knowledge of the fault current distribution is crucial in grounding, mitigation to reduce interference on communication circuits and pipelines, power systems protections calibration and coordination, neutral grounding resistor sizing and many other applications.
NETS is also useful to calculate data input for other XGS modules (for instance the split factor and the current to earth) without unrealistic assumptions as for instance, magnitude of fault current known and unaffected by grounding impedances, impedances of overhead earth wires or tower footing resistances uniform along the line, or again, infinite length of lines …
Moreover, NETS represents the link between XGS and the most diffused commercial software for power systems analysis.

Tags: Eriksson method, Rolling Sphere methodcorona effects evaluationMulticonductor
network solver
Earthing design softwareGrounding design softwarelightning protection designelectromagnetic simulationcathodic protection designearthing system designearthing
software
grounding softwaregrounding system design

SHIELD is a powerful full 3D graphical application for the evaluation of the protection of structures from direct lightning strokes using the Rolling Sphere and the Eriksson methods. SHIELD considers International (IEC 62305-3:2012), European (EN 62305-3:2012) and American (IEEE Std 998-2012) Standards but as known, the Rolling Sphere Method is considered by many other standards (NFPA, AS …). When the Rolling Sphere Method is set, SHIELD first generates a 3D surface corresponding to all possible points that can be touched by the surface of the sphere with a specific radius as it rolls over the air termination system. The air termination system can be composed of any combination of masts and wires (catenary wires included). This surface defines the protected volume. The protected volume is then superposed to the structure to be protected. The parts of the structure to be protected that protrudes over this surface are not protected. If the method is applied to the structure to be protected, it can identify the possible lightning strokes impact points and gives indications for the air termination positioning. When the Eriksson Method is set, SHIELD generates the collection area of air termination system and structure to be protected. The lightning protection system is effective when collection area of air termination system includes collection area of structure to be protected. The User can modify the lightning protection system and generate again the protected volume or collection areas. Tags: Eriksson method, Lightning Shielding, Rolling Sphere method

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