English 
Portuguese COTESA Engenharia takes part in a wind sector fair
COTESA Engenharia participated in the 12th Brazil Wind Power, which brings together the major players in the national and international wind sector and promotes discussions on the next steps of the energy transition, the prospects for a future Net Zero (carbon neutralization), new technologies such as green hydrogen storage and regulation of the offshore wind market.
Washing of insulator bays in substations
COTESA Engenharia carried out the washing of two isolator bays in two 500kV substations, in an action that involved 11 employees and lasted five days. Before starting the washing period, the professionals received training on electrical criteria, equipment characteristics, problem identification, methodologies adopted and safety aspects.
Corrective maintenance performed in Transmission Line
COTESA Engenharia carried out a programmed corrective maintenance service on two 525kV Transmission Lines. The service corrected anomalies detected during previously performed inspections.
Inspection of 137 metallic structures concluded
COTESA Engineering has concluded the detailed inspection with escalation of 137 metallic structures, with grounding resistance measurement, thermographic verification and corrective maintenance.
The Corona Effect on Transmission Lines
O efeito Corona é a deformação do campo elétrico e ocorre a partir da ionização do ar ao redor de um condutor elétrico, ocasionando um estalo luminoso (ruído brilhante).
The installed capacity in the National Interconnected System
In the Brazilian hydro-thermal-wind system, hydroelectric plants are responsible for most of the generation, with more than 60% of the installed capacity.
The basic power transmission grid in Brazil
In a continental country, in which a large part of the energy generation is distant from the consumer units, having a basic transmission grid in full operation is not an easy task.
How does the communication between the Operations Center and ONS take place
The communication of an Operations Center with agents of the National Electric System Operator (ONS) and with the assets themselves is carried out through terrestrial and satellite links, always being recorded through voice recording systems.
Anomalies in solar plants generated losses of US$ 435 million in 2021
According to the Global Solar Inspection Report, failures from photovoltaic plants will cause $435 million in potential losses to the world market by 2021.
Environmental audit is performed without non-compliance at UHE Dona Francisca
Auditoria foi realizada em junho por empresa homologada pelo órgão ambiental responsável, que verificou estrutura do ativo, analisou 41 documentos e quatro áreas.
Próximo passo é manter o padrão sem não conformidades, dando continuidade à vigilância aos prazos através do plano de ação e do monitoramento constante.