By C. T. Leonides
This can be a 4 quantity series dedicated to the numerous subject matter of advances in electrical strength structures research and regulate suggestions. The large parts concerned comprise transmission line and transformer modelling. The 4 quantity series will specialise in advances in components together with energy circulation research, fiscal operation of strength structures, generator modeling, strength structures, generator modeling, strength structures, generator modelling, strength procedure balance, voltage and tool keep watch over concepts, and approach defense
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Additional resources for Analysis and Control System Techniques for Electric Power Systems, Part 4 of 4
A sample based differential relay could be used if the relay were disabled as soon as one of the cts saturates. This could be accomplished by a transient monitor or through the use of an analog circuits which would provide a trigger indicating the start of ct saturation. A different approach to digital bus protection has been proposed using percentage differential principles and phase comparison techniques . A saturation detector based on the change of slope of the current samples is used in a scheme using a percentage differential as the primary protection and phase comparison as a backup.
K) H j + 1 [ H k + 1 P(k+l|k) H j + 1 + R k + 1 Γ 1 (58) P(k+l|k) = ^ P(k|k) φΐ + Tk Qk Γ £ and P(k+l|k+l) = [ I - K k + 1 H k + 1 ] P(k+l|k) (59) (60) The Kaiman gain matrix K,, the covariance of the onenstep prediction P(k+l|k) and the covariance matrix in the estimate at time k-fl, P(k+l|k+l) are given by Eqs. (58)-(60). The recursion in Eqs. (57)-(60) is initialized with an a-pnori estimate of x and an a-priori covariance matrix P(0|0). The prior estimate actually distinguishes the Kaiman filter solution from the solution in Eq.
J. F. Moont, "Application of Digital Computers to Busbar Protection," IEE Conference on the Application of Computers to Power System Protection and Metering, Bournemouth, England, May 1970, pp 201-209. 5. A. F. Morrison, "A Restraint Differential Protection Computers," IEEE Transactions on Vol. 91, No. 3, May/June 1972, pp 6. S. W. Wind, "Generator Differential Protection Using a Hybrid Computer," IEEE Transactions on Power Apparatus and Systems, Vol. 92, No. 6, November/December 1973, pp 2063-2072.
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