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International Conference on Power Systems Transients (IPST)

June 15-18 2015, Cavtat Croatia

ABB is a leader in power and automation technologies that enable utility, industry, and transport and infrastructure customers to improve their performance while lowering environmental impact. To maintain and strengthen ABB’s position as a technology innovation leader, we collaborate with more than 80 universities around the world and in order to stay on top, we are continuously seeking to build a stronger relationship between the educational institutions both in Sweden and outside.

The International Conference on Power Systems Transients (IPST 2015) was created with the goal of promoting the study of Power Systems Transients by offering a forum for the exchange of scientific and technical information related to electromagnetic transients in electric power systems. Beside the ABB, the participants are representatives from the universities, utilities and from the manufacturing companies. However, the knowledge gathered in such conference is very valuable for ABB and for understanding the various phenomena occurring in power systems. For relay protection and control point of view, it is essentially worthwhile to be aware of these phenomena.

ABB has submitted two technical papers which got accepted for the inclusion at the conference and both papers have received very positive reviews. The papers describe the outcome of the results of the collaboration between ABB and the respective educational institution.

(ID-47) ATP-EMTP EVALUATION OF RELAYING ALGORITHMS FOR SERIES-COMPENSATED LINE

The implementation of series capacitor compensation on extra-high voltage transmission lines is a subject of great interest from the technical point of view. Especially, the attention is paid to protection and control systems for such transmission networks. A variety of relaying algorithms are investigated with the use of the developed model of the series compensated line. Different locations of faults, as for example for the forward fault in front of the compensating bank, forward fault behind the compensating bank, and backward fault, are taken into account.

The first group of the studied algorithms is devoted for measuring the impedance for digital relaying. The algorithms gathered in two basic families have been tested:

  1. Methods based upon Fourier orthogonal components (two variants: using a full-cycle and a half-cycle data windows) and
  2. Methods founded on differential equation techniques (four variants with applied various digital differentiation rules and additional pre-filtration).

Extensive simulation studies have been performed for comparing the measuring techniques in terms of speed and quality of provided estimation. As a result of that, the recommendations with respect to impedance algorithms for protection of series compensated lines are stated.

The other studied algorithms are related with application of the positive sequence directional element for the considered series compensated line arrangement. Extensive simulation studies have been carried out for a variety of fault conditions (fault type, incipience angle, location and resistance of a fault, pre-fault power flow, infeed impedances, etc.). Selected simulation results are presented and discussed in the paper.

The aim of this study is to investigate this problem quantitatively in relation to relaying algorithms and to explain ABB´s ability to provide protection principles for such networks.

(ID-48) Evaluation of Fault Location Method for Distribution Networks

The accuracy of fault location has a direct impact on restoration of service and outage management in distribution systems. ABB is the pioneer of the fault location algorithm for the HV networks which is based on impedance measurement principle.

Information on accurate fault location available just after the fault helps utility personnel to expedite service restoration and to make adequate reconfiguration of the network for reducing outage time and operating costs. Therefore, more efficient methods for fault location, supply restoration and high quality customer service, which reduce the overall costs, are highly required. This paper delivers detailed results of an extended evaluation (using unnamed utility network) of a new fault location method (ABB experienced as in HV system) for suitable for even MV cable networks with the neutral solidly grounded or grounded across small resistance. Extensive sensitivity studies of the fault location technique have been done and some of the results are included in the paper. Computer simulation showed that the proposed algorithm has sufficient accuracy and robustness.

This is intended to emphasize that ABB´s solution is suitable of all voltage levels.

Presenter


webinars It was agreed and approved that Murari Saha will present the above papers. Murari Saha is as well a member (representing Sweden) of the International IPST 2015 Technical Committee.

Dr. Murari Mohan Saha was born in 1947 in Bangladesh. He received B.Sc.E.E. from Bangladesh University of Technology (BUET), Dhaka in 1968 and completed M.Sc.E.E. in 1970. During 1969-1971, he was a lecturer at the E.E. dept.,BUET.  In 1972 he completed M.S.E.E and in 1975 he was awarded with Ph.D. from The Technical University of Warsaw, Poland.

He joined ASEA, Sweden in 1975 as a Development Engineer and currently is a Senior Research and Development Engineer at ABB AB, Västerås, Sweden. He is a Life Senior Member of IEEE (USA) and a Fellow of IET (UK). He is a registered European Engineer (EUR ING) and a Chartered Engineer (CEng). His areas of interest are measuring transformers, power system analysis and simulation, and digital protective relays.

He holds 35 granted patents and produces more than 250 technical papers. He is the co-author of a book, entitled, “Fault location on Power Networks”, published by Springer, January 2010.


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