Blackout: preliminary analysis by the ONS points to the beginning of line disconnection in Ceará; ripple effect in the country is investigated

[ad_1]

The assessment is that an incident on a transmission line in the Northeast would not “cause the impact seen” on Tuesday (15). New details should be known at a meeting on the 25th and in an in-depth report. Minister says that failure in the Quixadá/Fortaleza transmission line was “zero event” of the blackout Federal. According to the agency, the first event that led to the interruption of energy supply was the opening (disconnection) of a transmission line located in Ceará. The information had already been anticipated by the general director of the ONS, Luiz Carlos Ciocchi, and by the minister Alexandre Silveira (Mines and Energy) in a press interview this Wednesday. In a note, the ONS states that the departure of the Quixadá-Fortaleza II line — operated by Companhia Hidrelétrica do São Francisco (Chesf), a subsidiary of Eletrobras — from the National Interconnected System (SIN) was due to “incorrect performance of the protection”. According to the agency, however, only the occurrence in Ceará would not “cause the impact seen” in the national electrical system. “This is a point that is still being investigated”, he says. In the statement sent to the press, the National Electric System Operator also points out that the agency’s teams will continue to “deeply analyze the occurrence”. The ONS predicts that a new, more detailed assessment should take place on the 25th, in a meeting with the Ministry of Mines and Energy and the National Electric Energy Agency (Aneel). “This assessment will be consolidated into a Disturbance Analysis Report (RAP), which takes about 30 days to complete,” he adds. According to the ONS, this was the chronology of the blackout: 1st occurrence: caused electrical separation of the North and Northeast regions from the South and Southeast/Center-West regions, with the opening of interconnections between these regions 08:43: the restoration of loads in the South region began , ending at 9:05 am 8:52 am: Restoration of Southeast/Center-West loads started, ending at 9:33 am 2:49 pm: SIN is 100% restored What remains to be clarified among which: What led to the disconnection of the Quixadá-Fortaleza transmission line ONS has already identified that the opening of the line (technical name for the disconnection) was the result of an “incorrect performance of the protection”, but it remains to clarify what caused this Error in the protection system. Earlier in the evening, Ciocchi told journalists that the hypothesis of human error has not yet been ruled out. How the disconnection of the Quixadá-Fortaleza transmission line led to a blackout in almost all of Brazil According to the ONS, “the isolated disconnection would not cause the impact seen on the SIN and this is a point that is still being investigated”. What Eletrobras says In a note released on Wednesday night, Eletrobras said it detected the problem on the Quixadá-Fortaleza line milliseconds before the national blackout. In line with the ONS preliminary report, the company declared that this, in itself, could not be the cause of the blackout. “It should be noted that the disconnection of the aforementioned transmission line, in isolation, would not be sufficient for the scope and systemic repercussions of what happened. The transmission networks of the National Interconnected System (SNI) are planned according to the criterion of reliability”, says the company.

[ad_2]

Source link