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.
University research approach to switchgear technology////Arc quenching phenomena
As a university feels lack of possibility for the circuit breaker research, several approaches are described. Four technical fields are explained, and they are 1) arc quenching phenomenon, 2) circuit switching phenomenon, 3) MEMS sensor application technology and 4) new material application technology. Two examples are shown from the field 1). The electron density measurement by a Shack-Harmann sensor is promising to make quenching phenomena clear, as the electron density can be measured at 1 A. The dc circuit breaker research by using a EDLC capacitor bank will be useful for a new electric power grid development.
Frank Must Marry Money: Men, Women, and Property in Trollope's Novels
There is a continuing debate about the extent to which women in the 19th century were involved in economic life. The paper uses a reading of a number of novels by the English author Anthony Trollop...