The Salina Cruz refinery, the largest in Mexico's refining system, suspended operations at its 26 processing plants due to an electrical problem, state-owned oil giant Petroleos Mexicanos, or Pemex, said.

The problem occurred on Tuesday at the refinery, which is located in the southern state of Oaxaca.

A "power outage caused the shutdown of the equipment at the Salina Cruz refinery," Pemex said.

The refinery has the capacity to process 330,000 barrels per day (bpd) of crude oil.

The suspension of operations was ordered as part of standard safety procedures, Pemex said.

The refinery shutdown "poses no danger to the population, no personnel were hurt and the facility was not damaged," the state-owned oil company said.

Personnel trained to deal with such situations are handling the problem, Pemex said.

Pemex, which is building a new refinery, produced an average of 3.79 million bpd of hydrocarbons in 2010, with crude oil accounting for 2.57 million bpd of the total.