NETS is a very flexible tool to solve Full Meshed Multi-Conductor and Multi-Phase Networks and is based on the Phase Component Method and graph theory.
NETS can be used to solve Networks in Steady State or Fault conditions and in particular, NETS can calculate the Fault Current Distribution in Power Networks.
NETS is a computation code for the solution of full meshed multi-conductor and multi-phase underground and/or overhead networks in the frequency domain. The application range is limited to the model accuracy of transformers (up to 1 kHz) cables (up to 1 kHz) and lines (up to 10 kHz).
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 and 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 maximum number of conductors (and so of ports for a single cell side) is 26, so enough to represent most network components (the simulation of 6 cables with core, screen and armour requires 18 conductors).
The network components (sources, ideal voltage generators, ideal current generators, loads, transformers, lines, cables, impedances, switches, faults …) are represented with 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 parameters of lines and cables starting on data normally available in commercial data sheet. NETS calculates self and mutual impedances and admittance for all conductors using accurate formulas and taking into account the earth resistivity and permittivity.
NETS calculates parameters of single-phase or three-phase two or three-winding transformers starting on data usually available in commercial data sheet.
NETS includes a converter from the sequence domain to the phase domain. This tool can converts a sequence impedances matrix to a phase impedance matrix.
NETS can be used to solve symmetrical or non-symmetric, balanced or unbalanced transmission and distribution networks in steady state or fault conditions.
In particular, NETS can be used for the calculation of the fault current distribution in power networks and between power circuits and earth.
Moreover, NETS is a powerful tool for the evaluation of current distribution and electromagnetic interferences in case of railways corridors.
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 others applications.