Research on acceleration phenomena with test equipment of simulating puffer type gas circuit breaker
The diagnosis was investigated by using the acceleration measurement for mechanical failure and degradation of a SF6 gas circuit breaker (GCB). The mechanical model GCB was fabricated to produce similar acceleration characteristics to a real GCB. The MEMS (Micro Electro-Mechanical System) sensor was adopted for the purpose of confirming its applicability with the well-established piezoelectric accelerometer. The acceleration characteristics of the model GCB was generally similar to the real GCB of 300kV class, except the high frequency component. The MEMS sensor application was feasible with some limitations. It was indicated a mechanical failure could be detected by the acceleration measurement.
Acoustic diagnosis of high voltage circuit-breakers
A noninvasive technique for assessing the condition of circuit breakers by considering the acoustic signals generated during nonenergized switching is described. Mechanical malfunction, wear, and other types of abnormal behavior can be detected as changes in this acoustic signature. Digital signal processing techniques known from speech recognition were successfully applied to extract, compare, and present the information from the breaker signatures. A fault in the release mechanism which developed over time and eventually rendered one pole of a circuit-breaker inoperative was detected in an early stage, demonstrating the efficiency of this diagnostic technique. >
The application of adsorptive stripping voltammetry for a study of the reaction of human serum albumin with anti-human serum albumin
Abstract Adsorptive stripping voltammetry has been used to study the interaction of human serum albumin with anti-human serum albumin. The adsorptive stripping voltammetric behaviour of both proteins has been optimised with respect to accumulation potential, accumulation time and scan rate. It has been demonstrated that adsorptive stripping voltammetry can be a useful technique for the study of the interaction of these two proteins directly in solution.