Lifetime extension

Our data analysis with 750,000 comparable measurements showed that both of these generators with a voltage of 6,300V and an apparent power of 10 MVA were at risk.

The outcome was that 90% of comparable generators showed lower damage levels. This indicated possible upcoming failures or inefficiencies. 

Craft

The machines showed signs of tracking and cracking: irreversible degradation of insulation material due to the passage of leakage current across the final windings of a coil as a result of surface contamination and/or carbon formation. Surface cracking causes the windings to become hygroscopic.

Beautiful winding
The windings in these generators are unique and handcrafted. You don't see them like this very often anymore. It is always a pleasure for our engineers to work on these projects.

The Ljungström turbine is a steam turbine. It is also known as the STAL turbine, from the company name STAL (Swedish: Svenska Turbinfabriks Aktiebolaget Ljungström). Later, that merged into ABB. The technology has had numerous applications since its conception, from power plants to supertankers.

Steam inlet: Steam is supplied to the central part of the turbine, usually through an inlet pipe.

Radial flow direction: Instead of axial flow (where the steam flows longitudinally through the turbine), steam in the Ljungström turbine flows radially, from the center to the outer ends of the machine.

Rotating parts: The turbine consists of two halves rotating against each other. These halves have rotor blades that act as guide blades on one side and rotor blades for the steam of the opposite half on the other. This means that the steam passes through the rotor blades multiple times, providing efficient energy transfer.