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This paper investigates the performance of voltage regulating relays used to control on-load tap changing transformers in a meshed distribution system. Real-time digital simulation, together with hardware-in-loop connection of the actual relays, is used to investigate the performance of the relays under practical conditions in an actual distribution network. In particular, the paper focuses on the...
Due to its simple structure and lower price, the resistive type superconducting fault current limiter (RSFCL) is being used widely in practical experiences. As RSFCL needs considerable time to return from the normal zone to the superconducting zone after the fault clearance, operating in normal zone may create some problems. Since the number of faults on distribution systems is much more than the...
Stockbridge-type aeolian vibration dampers, if properly chosen and applied, have proven to be effective to protect overhead lines from harmful wind-induced vibrations. However, conventional dampers with bolted clamps may have shortcomings in damping high frequency vibrations of small diameter optical ground wires (OPGW) due to their high clamp mass. Theoretical considerations based on wave impedance...
- In the management of Power Quality to customers, voltage dip performance has often been done on the basis of contracted or regulatory voltage dip limits [3]. In South Africa, such limits were statistically derived for various voltage levels using (limited) data available for all measured sites in South Africa over a period of a few years. A very different approach was introduced by the National...
In this paper we present a novel method for estimating electromechanical modal parameters from noisy signals recorded during power system disturbances. The method is based on the weighted Structured Total Least Squares (STLS) approach for parametric signal modelling. Compared to Prony's method, the weighted version of STLS method is less sensitive to noise and trend components in recorded signal samples...
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