Monday, November 24, 2008

Ultra-High Voltage Transformer

A new transformer developed for the world’s first ultra high-voltage DC transmission systems (UHVDC) has successfully completed final testing. It is the first transformer for the new 800 kilovolts (kV) HVDC in China. Today’s HVDC transmission systems normally operate at a standard transmission voltage of 500 kilovolts. HVDC systems can transmit power over much greater distances and at considerably reduced loss than is possible with AC systems.

To achieve this 60-percent increase in peak voltage capacity, Siemens had to develop a range of entirely new technical solutions for the new 800-kilovolt HVDC transmission system. One of several major challenges facing the company’s development engineers in Nuremberg was a lack of any defined standards for this scale of system. Due to the very high operating voltage, for example, they had to design exceptionally effective insulation systems. Therefore, in order to achieve the needed insulating clearances in air, the two valve bushings through which the current flows from inside the transformer to the converters are 14 meters in length. To construct the 800 kV transformers, a new, specially air-conditioned production hall had to be built to prevent the insulation from absorbing moisture from the atmosphere during final assembly. Similarly, the test facility in the Nuremberg factory had to be adapted to accommodate the tremendous increase in voltage when carrying out final acceptance testing on the new transformer.


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At May 12, 2010 at 10:11 AM , Anonymous Arc Flash Guy said...

Hmmm mr anon, I'm not so sure its a hoax, its on the siemens domain too.

Nearly a million volts though, I'll bet that'd jump a mile.

At December 15, 2010 at 4:00 PM , Blogger Railgap said...

Compare this to the infrastructure and two extra-high-voltage testing labs that Russia built outside Moscow and Novosibirsk, for their 1.2MV trans-siberian hydroelectric power transmission line.

The rusting hulks of resonant cascade transformers, and two immense impulse (Marx) generators - one at each site - can still be seen from Google Earth and on various web sites.

So no, this isn't a hoax. It just isn't practical for most every day transmission lines.

Transmission lines operating above 1.5MV will probably remain impractical due to the formation of (spark) leaders from the lines leading to phase-to-phase and phase-to-ground faults.

At February 16, 2011 at 2:08 PM , Blogger xsystem said...

The one with a lot of blue stripes is a generator (with 3 stages, each 600kV) and the one to its left is the divider.

It's stress test procedure related to Siemens Power Transformer.

2.4MV generators are a standard lab equipment used in almost all German universities. HV testing is taking things a notch higher because of Higher transmission levels.


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