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Ultra High Voltage Laboratory


Cepel's new Ultra-High Voltage Laboratory (AT5) started its operation in 2016 at the Adrianópolis Unit, and is dedicated to conducting dielectric tests for experimental research, development and performance evaluation in Alternating Current (AC) (DC), transmission line configurations, insulation chains and other line components up to voltage classes at 1,200 kV AC and ± 1,000 kV DC.


General purpose equipment in power plants and substations (such as transformers, inductors, circuit breakers, switches, etc.) can also be evaluated, provided that in tests that do not require electromagnetically shielded environment and / or controlled atmospheric conditions.


This new laboratory infrastructure, a pioneer in the American continent, will play an essential role in supporting Cepel's applied research activities, aiming to overcome the technological challenges of developing new conceptions of high capacity transmission lines. These lines are vital for the transfer of large blocks of energy produced away from consumer centers, such as those associated with the hydroelectric facilities of the Amazon region.


The introduction of technological innovations in transmission projects requires the permanent development of studies, the construction of prototypes and the carrying out of experimental research in laboratory facilities and pilot lines. An example of this type of innovation are the High Natural Power Lines (LPNE) developed at Cepel, which has a relevant methodological and computational collection regarding this development, with practical results in the National Interconnected System obtained in partnership with Eletrobras companies.


The UAT External Laboratory is capable of carrying out performance evaluations, such as:

• transmission line arrangements and chains of AC, single-phase or three-phase insulators;

• arrangements of transmission lines and chains of DC, single-pole or bipolar insulators;

• AC, single-phase or three-phase voltage tolerant tests;

• DC-tolerant, monopolar or bipolar voltage tests;

• atmospheric and maneuverable impulse withstand voltage tests in AC and DC configurations;

• composite or combined tests: AC or DC sources and pulse generator;

• phase-to-phase insulation tests in AC configurations;

• polo-pole insulation tests in CC configurations;

• corona effect assessments in both AC and DC configurations;



The UAT External Laboratory has the following equipment infrastructure for testing and supporting structures:

• Gantry for mounting configurations of three-phase or bipolar transmission lines;

• 3 nominal voltage transformers 750 kV, 1.0 A each, which can be combined for single-phase installation with nominal voltage of 2,250 kV AC;

• 2 rectifiers rated 1000 kV, 50 mA each, which can be combined for single-pole mounting with nominal voltage of 1,600 kV DC;

• nominal voltage pulse generator 6.4 MV, 640 kJ;

• nominal voltage impulse generator 2.0 MV, 100 kJ;

• AC, DC and impulsive voltage measurement systems;

• instruments for measuring the corona effect;

• weather station to measure environmental conditions (wind, temperature, pressure, solar radiation, etc.)

• platform with 43 m of boom;

• crane with 17 m boom and load capacity of 2 t;

• tractor for moving the trucks that support the test equipment.


Contact the responsible area via email: