Explore our portfolio of studies conducted to enhance the electrical system

Electrical studies involve detailed analyses and evaluations conducted on electrical systems to understand their behavior, performance, and safety. These studies are carried out by experts and involve the use of simulation tools, modeling, and calculations to gain a comprehensive understanding of the electrical system.

We specialize in high-voltage electrical tests

We specialize in high-voltage electrical tests

HVEX originates from graduates, masters, and doctors from the High Voltage Laboratory at the Federal University of Itajubá – UNIFEI.

In our unit, we develop innovative research and development (R&D) projects aimed at solving the challenges that maintenance teams face daily and improving the quality of energy supplied by utilities.

Over ten years delivering quality to Brazil's energy

Our services are focused on developing solutions for the electrical sector, emphasizing technical quality and the relevance of results for the market and society.

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Explore our Studies Portfolio

Insulation coordination study

Insulation coordination study

The insulation coordination study selects or verifies the dielectric withstand capability of equipment in relation to electrical system overvoltages. It considers protection equipment characteristics, evaluating dielectric demands of temporary, switching, and atmospheric overvoltages.

Temporary overvoltage study

Temporary overvoltage study

This study aims to determine phase-to-ground or phase-to-phase dielectric demands resulting from load rejections, single-phase short circuits, ferroresonance, etc. This type of overvoltage is oscillatory and weakly damped. This study is crucial for determining and verifying the thermal capacity of zinc oxide (ZnO) surge arresters.

Switching overvoltage study

Switching overvoltage study

Switching overvoltage studies are also critical in determining the thermal capacity of ZnO surge arresters, as well as in determining safety distances between structures and conductors in transmission lines.

This type of study requires an analysis of possible maneuvers leading to the most conservative results. Cases involving energization, re-energization, and application of faults in transmission lines are typically evaluated. Energization of capacitive loads and rejection of inductive loads may also be considered.

Atmospheric overvoltage study

Atmospheric overvoltage study

This study evaluates overvoltages due to direct lightning strikes on transmission lines, analyzing surges in the substation and the risk of insulation failures. The results verify whether the withstand voltages of the equipment are sized correctly, considering the precise position of each item in the substation, such as lightning arresters, circuit breakers, and transformers, which directly impact overvoltages.

Very Fast Transients (VFT) study

Very Fast Transients (VFT) study

Evaluation of overvoltages in SF6 substations, similar to air-insulated substations, including temporary, switching, and atmospheric overvoltages. Examines fast-front overvoltages generated by switches and breakers in shielded busbars, with megahertz frequency. Special attention to high-voltage transformers and bushings.

Calculation of electric and magnetic fields in transmission lines and substations

Calculation of electric and magnetic fields in transmission lines and substations

The calculation of electric and magnetic fields in transmission lines and substations aims to compare exposure levels with the limits of ANEEL Resolution No. 398/2010. We perform computer simulations, preparing detailed reports of the fields along the installations. In case of non-conformities, adequacy reports are provided. We ensure compliance with regulations to protect human health.

Transient Recovery Voltage (TRV) study

Transient Recovery Voltage (TRV) study

The TRV study determines the post-short-circuit transient voltages at the breaker poles. By comparing with withstand envelopes, it ensures the breaker's ability to interrupt the current without exceeding limits, considering terminal, kilometric, and out-of-phase faults.

Calculation of Electric and Magnetic Fields in Transmission Lines and Substations

Calculation of Electric and Magnetic Fields in Transmission Lines and Substations

The calculation of electric and magnetic fields in transmission lines and substations aims to compare exposure levels with the limits of ANEEL Resolution No. 398/2010. We perform computer simulations, preparing detailed reports of the fields along the installations. In case of non-conformities, adequacy reports are provided. We ensure compliance with regulations to protect human health.

Power flow study

Power flow study

The power flow study evaluates the electrical system under normal and emergency operating conditions. It analyzes voltage profiles at the busbars and loads of the electrical network components, considering load conditions, dispatch of generating units, and system configuration.

Short Circuit Study

Short Circuit Study

Seeks to determine subtransient, transient, and steady-state currents at the busbars of the electrical system, analyzing contributions during faults. Considers three-phase, two-phase, two-phase-to-ground, and phase-to-ground faults, as well as simultaneous faults. Knowing the maximum and minimum short-circuit levels is crucial for evaluating equipment adequacy, supporting system expansions/modifications, and protection adjustments.

Electromechanical Stability Study

Electromechanical Stability Study

The electromechanical stability study evaluates the synchronization of the machines in the power system during disturbances such as short circuits, disconnection of generating units, load oscillations, among others. It defines load rejection criteria and reports the maximum time to avoid loss of synchronism under short-circuit conditions. Essential for defining selectivity and protection parameters.

Automatic Reconnection Study

Automatic Reconnection Study

Automatic reconnection is widely used in electrical systems, aligning the interests of operators and utility companies. Benefits include improved dynamic performance, reduced post-disconnection disturbances, increased reliability, and availability of circuits. To reap these benefits, increasing the success rate of reconnection is crucial.

Energization and Load Rejection Study at the Fundamental Frequency

Energization and Load Rejection Study at the Fundamental Frequency

The transmission line energization study seeks to evaluate the adequacy of the reactive compensation defined for the line, identifying the need for operational restrictions during energization. The load rejection study complements this analysis, especially in specifying line reactors.

Selectivity and Protection Coordination Study

Selectivity and Protection Coordination Study

Involves the sequential arrangement of protection devices to ensure selectivity. Selectivity analyzes the protection system's ability to isolate the damaged part without affecting other circuits. Benefits include improved protection, coordination assurance, increased reliability, and operator safety. Studies cover transformers, generators, industrial systems, and transmission lines.