All over the world there occur more and more unexpected resonances in railway power grids. They are caused by the steadily growing number of digital power electronic components and regulators in the supply infrastructure. Their numbers and amplitudes are also significantly higher than the amplitudes of the harmonic resonances that were present in traditional infrastructures.
Grid resonances — a serious threat to your railway infrastructure
If these harmonic resonances are undamped, their amplitude can be as high as the signal amplitude of the base frequency of the supply grid. Resonances caused by harmonics could not only damage the supply infrastructure itself but also the equipment connected to it. The bandwidth of these resonances ranges from a few Hz up to a couple of kHz.
Grid Harmonics Tolerance Test (GHTT) for e‑locomotives
To avoid the malfunction of an e‑locomotive its tolerance against harmonics that may occur in the rail supply grid should be tested. EGSTON provides a specific test system for this task that ensures a significantly higher reliability during operation.
IMS method to investigate and avoid harmonic grid resonances
Newest publications explain the causes of harmonic resonances and provide analytical methods how to measure, analyse and avoid them. The Impedance Measurement System (IMS) creates impedance plots from e‑locomotives and rail supply grids. With the help of IMS harmonics that are caused by their interaction can by predicted before they even occur. This increases the availability of your rolling stock in your daily operation significantly.
• CSU — Harmonic Injection
• IMS Rail
• GHTTS Rail