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Operator says power line that caused major Czech outage wasn't overloaded

Grid operator CEPS confirmed on Thursday that a high-voltage line which snapped in the Czech Republic at the beginning of a major outage on Friday, was not overloaded at the time. It added that it is still investigating the cause.

The outage affected about million customers and halted hundreds trains. It also shut down major industrial sites, including an oil refinery. This incident added to the concerns regarding the vulnerability of European grids following recent outages in Spain, Britain and France.

CEPS, which provides details on the events that led to the power grid failure in central Europe, said the problem began at 11.51 am (0951 GMT), when a 400 kilovolt cable snapped along the V411 line located in the north-west part of the country.

CEPS Chairman Martin Durcak said at a press conference that the reason is still being investigated, but that there was no interference from a third party.

He said that the grid was designed to withstand such an event and shouldn't disintegrate.

The incident was immediately followed by the failure of Ledvice unit 6, which had been running at 300 megawatts, in the north.

Durcak stated, "We will investigate this matter with our colleagues from CEZ (the owner of Ledvice) to see if any causality exists."

After the overloading of the 200-kilovolt high-voltage V208 power line, the eastern substation and the V401 high voltage link failed at 11.59 am.

The grid was broken, resulting in insufficient electricity production in parts of the north-east and the centre of the country, followed by the outage.

Nine of the 45 substations in the country and approximately one-sixth of all customers were affected.

CEPS reported that all substations had been restored within three hours and the cable snapped by 10 pm.

The grid carried large but routine cross-border flow as traders purchased power from abroad because of lower prices there. Reporting by Jan Lopatka, Editing by Mark Potter

(source: Reuters)