Guri’s woes worsen

Caracas Gringo warned in October 2009 that the Guri Dam was at growing risk of suffering a catastrophic failure that could destroy most of its hydro-power generation infrastructure. The risk that Guri could suffer a catastrophic failure is substantially greater now than it was almost seven months ago.

The catastrophic failure of a single turbine could trigger a collapse, shutting down Guri completely and possibly forcing Edelca to shut down the Caruachi and Macagua hydropower complexes downriver from Guri. This would deprive Venezuela of almost 70% of its power supply.

Officials at Guri report that Turbine No. 8, a 400 MW-capacity Francis turbine, came very close to suffering a catastrophic failure on 2 May.

The turbine, which has a history of “cavitation” (i.e. vibration), started to vibrate “very violently,” an Edelca source says. Fortunately for Venezuela, quick-thinking Edelca operators shut down the turbine immediately. But the vibrations were so strong that the turbine and surrounding concrete infrastructure appear to have suffered substantial damage, according to the Edelca source.

Corpoelec says that the incident remains under investigation by the national intelligence service (Sebin), and declines to say when Turbine No. 8 might be restarted. But our Edelca sources report that the turbine could be out of service for months while the damages are assessed and repairs are completed. Meanwhile, No. 8’s shutdown means that nine of Guri’s 20 hydropower generation turbines currently are out of service.

Our Edelca sources also say that No. 8 isn’t the only turbine with vibration problems.

Corpoelec also declines to say when Planta Centro’s thermal power generation unit No. 4 will be restarted. No. 4 was shut down on 5 May due to a transformer explosion and fire at the 400 kV/230 kV sub-station near Moron. At the time, No. 4 was generating 320 MW, according to plant operator Cadafe.

Half of Puerto Cabello was left in the dark, and power still has not been restored completely as we write this post. It was the fourth major accident at Planta Centro since 1 January 2010. Planta Centro’s rated generation capacity is 2,000 MW spread among five 400 MW thermal power generation units, but it usually generates between 150 MW and 300 MW from Units 3 and 4.

These two incidents have taken 720 MW of power offline, perhaps for months.

Edelca sources say that Corpoelec has given orders to increase the volume of water flowing through Guri’s 11 operational hydropower turbines to offset the loss of No. 8’s 400 MW and the loss of the 320 MW that Planta Centro’s No. 4 was generating.

But raising the volume of water flowing through Guri’s turbines implies greater risks of more equipment breakdowns. Necessary maintenance work must be suspended, and old turbines strained from over-use come closer to the point of unexpected failures.

About Caracas Gringo

Representing less than 0.00000000001515152% of the world population as of 31 December 2011.
This entry was posted in Uncategorized. Bookmark the permalink.

5 Responses to Guri’s woes worsen

  1. Roberto N says:

    Ay carajo!

    Like

  2. carricito says:

    One question. How is possible that one turbine has been closed and there wasn’t a huge blackout? I mean, 400MW???

    By the way, whats the level of the river? official reports?

    CG response: The loss of No. 8 (400 MW) is being compensated by pushing more water through the 11 turbines still in operation. Guri’s water level is still falling.

    Like

  3. Dagoberto says:

    Regarding Planta Centro, there is some kind of data mismatch here.

    Planta Centro’s unit #4 has been working without interruptions since April 12 according to OPSIS website:

    http://opsis.org.ve/

    It is unit #3 that quit working on April 4th, and hasn’t come back since (maintenance, maybe?).

    CG response: Cadafe confirms that No. 4 was affected, and remains off line. Cadafe also says thatonly No. 4 was operational when the transformer explosion happened at the nearby sub-station. We’re told that Opsis (not Centro Gestion Nacional) has Opsis appears to be mistaken.

    Like

  4. CuervoBlanco says:

    So, the few rains just worked to calm down things a bit but Guri is still on its way down. SO that leave us fresh again the scene of a national colapse…

    Nice.

    Like

  5. moses says:

    CG:

    Do you have any problems if we link your blog to ND ?

    CG response: No problems. Thank you.

    Like

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s