Dr. Cezary Dzienis Siemens AG- Germany
Cezary Dzienis graduated with a degree in Electrical Engineering from Warsaw University of Technology in 2003. He then worked for the university’s division of Industrial Electronics and Control System until 2004. Afterwards he worked for the Chair of Electric Power Networks and Renewable Energy Sources at the University Magdeburg where he completed his Ph.D. in 2007. Since June of 2008 he has been a researcher in the area of protection algorithms at Siemens Berlin.
Jörg Blumschein Siemens AG- Germany
Jörg Blumschein studied technical cybernetics and process measurement at the University Magdeburg where he graduated as an engineer in 1992. Since 1992 he has worked with Siemens in the development department of protection relays. He is now responsible for the development of the SIPROTEC relays.
Matthias Kereit Siemens AG- Germany
Matthias Kereit was born in 1968 in Berlin, Germany. He studied electrical engineering in Berlin and graduated in 1992. He has been working with Siemens since 1992 and is now developing algorithms for digital protection relays, especially for distance protection relays. Since 2008 he is also responsible for the University cooperations of the Berlin development department as a project manager.
Interview with Dr. Cezary Dzienis, Jörg Blumschein and Matthias Kereit from Siemens AG Germany:
Dr. Dzienis, what recent energy industry developments motivated you and your colleagues to write a paper about Ultra Fast Relay with Small Communication Requirements?
There are two aspects. The first one is the fact that electrical energy demand is increasing continuously and due to this situation, existing transmission power system networks are working at their thermic performance limits. This contributes to the effect that each short over-current or fault can lead to a permanent outage, or in the worst case to a blackout. In these cases the fast tripping time is necessary to recover the system as fast as possible to normal operation. This novel function is one of the possibilities if simple communication channels are available. Only a simple communication link without complex synchronization is required. From this point of view the described method contributes to the increase of energy availability.
The other aspect is ongoing high investment in the electrical infrastructure, especially by developing countries. The newest technology for power transmission components, e.g. fast circuit breakers, is applied there. In order to use the properties of these elements fully, fast protection functions are necessary. We have already received positive feedback according to this new method. With this paper we would like to show our customers that our protection devices closely follow the development in the area of network components.
Mr. Blumschein, can you give a concrete example of how utilities will benefit from your novel very fast protection algorithm?
The novel very fast protection algorithm can reduce the tripping time. This is important to increase the lifetime of the primary equipment. Additionally, the fast tripping time will increase the system stability.
Mr. Blumschein, you stated that this fast protection algorithm would definitely be of interest to every energy utility that has problems with the quality of the digital communication channels available between line differential relays; where are the majority of utilities located who are facing this situation? Germany? Worldwide?
Utilities worldwide have problems using line differential protection with communication channels, which have different and changing propagation delay for the sending and receiving side. With the proposed method these problems will no longer be a main focus for utilities.
Mr. Kereit, when will this technology be available to customers and in what form e.g. will it already be integrated in our products or will it be available as a separate function?
The new technology will become a part of the new SIPROTEC 5 system, and the release date will be fixed by our product management. Because it will be available as an added function for the SIPROTEC 5 system, the new method can work in parallel to the conventional and well known protection functions like distance protection and line differential protection. The advantages of both functions can be combined to reach the fast tripping time of the new method and the high accuracy of the conventional protection functions. Clear faults can be tripped faster than by conventional protection. Moreover, difficult cases will be handled by the conventional protection function.
Mr. Kereit, if I were an interested utility, what would be my next step? Who should I contact?
I would contact the product management or the responsible consulting engineer. An analysis could be performed explaining which benefits you can get from the new function. In difficult cases a prototype test can be performed on a digital network simulator. Such a test will provide a good overview about the behavior of the new function in your network. In any doubt of who to contact, try your regional sales, who will be able to assist you further.
Dr. Dzienis, what strengths did each of you bring to the collaboration on this interesting paper?
For the realization of a new function, different skills and relationships are necessary. Mr. Blumschein played an essential role in this project because of his good connections to electric utility customers. Together with the product management, he evaluated the needs of the customers and initiated a research project to understand their new requirements. Mr. Kereit and I brought lots of experience in developing protection algorithms to the team, which helped us find fitting solutions. Only as a team were we able to close the gap between gaining close contact to customers and having the know-how to create solutions. For example, to develop protection functions for real time systems, it must be checked if the idea can be realized on the available system. Therefore, close customer contact and experience in testing is necessary. And since creativity and teamwork is always needed to reach an optimal solution, it was beneficial that we all have worked together in the field of line protection and that our skills and personalities complement one another.