ABB Ltd

About: ABB Ltd is a company organization based out in Zurich, Switzerland. It is known for research contribution in the topics: Voltage & Signal. The organization has 6222 authors who have published 6852 publications receiving 83994 citations.

High voltage circuit breaker with cooling

Abstract: A heat pipe (1) carries off heat-loss in an inner conductor (21) and extends from the inner conductor as far as an outer conductor (22). It also has an insulating hollow body (5) to form an electric insulating section (7). The heat pipe can run in an insulator (24) to support the inner conductor. An independent claim is also included for a method for cooling a heavy-duty circuit breaker's inner conductor stretched as an oblong and surrounded by an outer conductor in the form of a casing.

Cable fault detection

Abstract: A cable fault detection component (168) receives input data indicative of a fault in an electrical power system. The component (168) analyzes the input data to determine if the fault is indicative of a self-clearing cable fault and generates corresponding output data (276). In one implementation, the cable fault detection component (168) is implemented as a software module which operates on a computer (105) of a substation intelligence system (104).

High voltage circuit breaker

Abstract: In connection with synchronous closing or opening of three-pole circuit breakers, the desired time shift between the instants of contact make or contact break in the different phases can be achieved mechanically by a suitable choise of arms and links in the mechanical system interconnecting the contacts and the operating device. The necessary time difference between the instants of switching, with retained positions of open and closed contacts, can be achieved in mechanism with a toggle joint (4, 51) which is extended to a greater or smaller extent in the three poles.

Paralleled Operation of High-Voltage Cascode GaN HEMTs

Abstract: Paralleling devices is an effective way to achieve a higher power application while still having the convenience of using discrete devices. However, the mechanisms of potential failures and the circuit design considerations have not been thoroughly studied yet, when paralleling gallium nitride high-electron-mobility transistors (GaN HEMTs) in cascode configuration. This paper presents a comprehensive study of paralleled high-voltage cascode GaN HEMTs, evaluating both circuit design and device characteristics. The mechanisms of current oscillation, which occurred during the cascode GaN HEMT parallel operation, are analyzed in detail. The Q3D tool and Spice-based simulation model jointly quantify the sensitivity of the circuit parasitic parameters and the cascode GaN HEMT mismatches during the paralleled operation. General design guidelines are provided in the paper as well. A group of experimental results ultimately validate the analysis toward parallel operation.

A linear contribution factor model of distribution reliability indices and its applications in Monte Carlo simulation and sensitivity analysis

Abstract: This research work presents a linear contribution factor model (LCFM) between a component's contribution to reliability indices and the failure rate of the component in distribution systems. This linear model can be applied to risk analysis (based on Monte Carlo simulation) and sensitivity analysis. Traditional approaches for both analyses require many repetitions of reliability index assessment (RIA). If this linear model is applied to either risk analysis or sensitivity analysis, only one RIA is needed and the computation is tremendously simplified.