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At the heart of Itaipu: energy runs through GIS
Tamanho da letra
01/04/2009

The last path of Itaipu’s energy before falling into the system is the Gas Insulated Substation or GIS, on elevation 128. For this reason, the last material on U07 maintenance focuses on the GIS activities.  It is a quick job, lasting just three days, but no less important.    Maintenance in GIS doesn’t only depend on the machines shutdown; it goes much further than this.  As it is linked to the bus bar and transmission line, maintenance occurs throughout the year.   

The last path of Itaipu’s energy before falling into the system is the Gas Insulated Substation or GIS, on elevation 128. For this reason, the last material on U07 maintenance focuses on the GIS activities.  It is a quick job, lasting just three days, but no less important. 

 

Maintenance in GIS doesn’t only depend on the machines shutdown; it goes much further than this.  As it is linked to the bus bar and transmission line, maintenance occurs throughout the year.   

 

 

 

 

But with the focus on U07, during the shutdown, the SMMT.DT team took a few measurements.

 

The first of them verified the opening time of the circuit breakers, that is, how long the circuit breakers took to respond after activated. “It cannot pass 30 milliseconds”, confirmed GIS specialized technician Eleceu Barz, from SMMT.DT. “If it passes this, it needs maintenance.” Another job is to measure the Ohmic resistance of the main contacts, that is, the quality of the circuit breaker contacts, in other words, if they really will respond when necessary. 

 

Finally the gas.  Sulfur hexafluoride (SF6) is a gas with a pompous name and a noble mission: to insulate the electrical field generated by energy that runs through the GIS bars. The technicians measure the humidity and purity of this gas. SF6 is measured every two years.

 

Three years ago, Itaipu developed a device that stored the gas that passed through the gauge, impeding it from being released into the environment.