J.W. Porter

TL;DR: The need for a distribution current limiting device (DCLD) by the utility industry is addressed in this paper, where an evaluation was made of what specifications would be acceptable and what DCLD technique would fill the utilities' needs.

TL;DR: In this paper, the authors have developed a modular HVDC circuit breaker that is suitable for a wide range of system voltages and energy levels and has been shown to increase the current interrupting capabilities to 4000 A DC and more and decrease the fault clearing time to the order of AC breakers of similar voltage ratings.

TL;DR: Noninvasive vibration diagnostic techniques are implemented to assess the mechanical condition of power circuit breakers, that classify the circuit breaker as being in normal-transitional-abnormal (green-yellow-red) condition.

TL;DR: The architecture of the SUNBURST monitoring systems and the central control network is described and a first look at representative data recorded during recent GMD events is provided.

Abstract: Generator winding models were developed for simulating dielectric stresses arising from 5-50 kHz oscillatory transients and from steep-fronted surges. For oscillatory transients, field tests were used to build a distributed parameter line model, which was then simplified to a second-order R, L, C network. For steep-fronted surges, a new empirical formula for the winding surge impedance was developed and validated. Simulations based on these models show that the inductive transfer of lightning may be larger than previously reported. Also, power frequency bias is larger on an adjacent phase than transfer within one phase. Higher stresses may arise for distant lightning surges having an initial phase-to-phase component and for fault-generated transients resonating within the generator winding. Reflections at the end of the first slot can amplify steep-fronted surges. A novel model for capacitive transfer in the step-up transformer may replace expensive factory surge tests. >