2003 2002 2001 2000 1999 -1998
Magne Runde, B.Skyberg, Mats Öhlén
"Vibration analysis for periodic diagnostic testing of circuit-breakers", Proc. High Voltage Engineering Symposium (ISH), London-UK, Aug. 22-27, 1999, pp. 1.99-1.101.
Abstract: The present paper focuses on vibration analysis for periodic diagnostic testing of circuit breakers. Initially, the basic ideas and the applied procedures are briefly outlined. Then the features of this method are evaluated with basis in the prevailing failure modes according to the CIGRE surveys. Commercial test equipment has been available for a few years, and in the main section results obtained by applying this method on high-voltage SF6 circuit breakers are presented. Some measurements illustrating the use of vibration analysis together with conventional methods such as recordings of contact travel, coil current and operating times are also included
H.K. Høidalen, Magne Runde, Odd Haugland, Georg Ottesen, Mats Öhlén
"Continuous Monitoring of Circuit-Breakers using Vibration analysis", Proc. High Voltage Engineering Symposium (ISH), London-UK, Aug. 22-27, 1999, pp. 1.102-1.106.
Abstract: This paper describes a prototype instrumentation for continuous monitoring of circuit-breakers using vibration analysis. A PC-based equipment records vibration patterns, performs analysis and presents trends automatically. Some preliminary results are presented, and the experience with the method and instrumentation is briefly outlined. The results so far are sufficiently interesting to continue pursuing the technique
H.K. Høidalen, L. Prikler, J.l. Hall
ATPDraw- Graphical Preprocesor to ATP. Windows version" , Proc. Int. Conf. on Power System Transients, Budapest-Hugary, June 20-24, 1999, pp. 7-12.
Abstract: ATPDraw is a graphical preprocessor to the ATP-EMTP on the MS Windows platform. This paper outlines some of the latest developments of ATPDraw, including improved handling of MODELS, direct execution of ATP, more components, and the User’s Manual. The ongoing development is also presented.
"Calculation of Lightning-Induced Overvoltages using MODELS", Proc. Int. Conf. on Power System Transients, Budapest-Hugary, June 20-24, 1999, pp. 359-364.
Abstract: The paper presents a method for calculation of lightning-induced overvoltages (LIO). The modeling of the lightning channel as well as the coupling to overhead lines is formulated analytically and implemented in MODELS in ATP. The analytical approach is possible as long as the overhead line and the ground is assumed lossless and the transmission line model is used for the lightning channel with constant current velocity. A large number of overhead lines can be included in an ATP data case, and each line can consist of several conductors. The paper presents calculation results of LIOs in a larger low voltage system with and without a neutral wire. The dependency of stroke location, overhead line configuration and the low voltage in the system is studied as well as the effect of arresters.
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