SAO PAULO, BRAZIL - After an unusual number of explosions involving the same transformer model, several Brazilian power transmission companies started removing current transformers made by General Electric.

Brazil's grid operator ONS recommended replacing GE's CTH-550 transformer model after registering 53 explosions, saying the equipment showed "a failure rate that is superior to what is expected" for this equipment, reports Reuters.

There are approximately 700 pieces of these units in Brazil's grid. Power transmission companies have already launched tenders to buy replacement transformers as they discuss the costs and a schedule for the changes with GE and regulators.

GE is investigating what caused the equipment failure in Brazil. In a statement to Reuters, GE said: "GE Grid Solutions performed a series of checks in the equipment with its clients and, as of this moment, there is no evidence that the problems were caused by the design, components or production processes."

Brazil's electrical energy regulator Aneel said that, after conducting a detailed analysis, it has determined the problem is with the manufacturer.

Taesa, one of Brazil's largest power transmission companies, and Colombia's ISA ISA.CN already started replacing this model of transformers in their networks. Due to the changes and lead times, the process is expected to take one year.

Source: Reuters