English 
Portuguese 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.
It was observed that the predominance of contamination of the insulating elements was caused by dust and slime, with the measurement of the conductivity of the water used during the washing process.
In total, 18 disconnect switch insulators, ten current transformers, 12 circuit breakers, and six pedestal insulators were washed.
The service included a Transmission Line maintenance specialist, two maintenance supervisors and eight electricians. The material used was a tank with a capacity of 12,000 liters of water, a set of hoses and a motor pump.