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Fault in the Medium-voltage Network: Delta Completes the World's Most Powerful Test System

Wilhelmshaven, Germany - In order to avoid a widespread loss of generation capacity in the manner of a domino effect, decentralized generation plants must also have a minimum tolerance for short-term voltage changes, e.g. due to short circuits or lightning strikes. The voltage tests can be carried out with the help of appropriate test equipment.

Delta Energielösungen Technischer Anwendungen GmbH from Wilhelmshaven has now completed what it claims to be the world's most powerful and compact test system for simulating errors in the medium-voltage network. The system is housed in a test container (40 feet). To carry out tests, the container can simulate network errors by looping into the connection line of a generation system using a medium voltage switchgear. According to Delta GmbH, the test equipment causes considerably less mains feedback than previous systems.

This means that the fault ride through properties of generation units such as wind turbines, cogeneration units, batteries or solar inverters can also be tested on "softer" grids in accordance with national or international guidelines. With the potential transmission power of 30 MVA on a 30 kV network, entire wind farms or solar fields can be measured with all their interactions, according to Delta. Outside of the test cycles, the generation systems can continue to be operated in the bypass mode as usual, while the next configuration can be prepared inside. Other locations of the test facility could also be critical infrastructures such as airports, tunnel systems, hospitals or other sensitive consumer loads.

"The development of the autotransformer is certainly groundbreaking," says Rainer Klosse, one of the 3 managing directors of delta. The specific choice of materials and the complete absence of electrically conductive materials for the manufacture of the coil holder allows the compact design, Klosse continued. According to Delta, the test system based on economy transformers can be used to simulate vector and polar wheel angle jumps in addition to the classic 2- and 3-phase faults.



Source: IWR Online, 27 Mar 2020

 


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