Westinghouse Electric

About: Westinghouse Electric is a company organization based out in Cranberry Township, Pennsylvania, United States. It is known for research contribution in the topics: Brake & Signal. The organization has 27959 authors who have published 38036 publications receiving 523387 citations.

Electronic circuit breaker with protection against sputtering arc faults and ground faults

Abstract: A circuit breaker bandwidth limits a sensed rate of change of current, di/dt, in the neutral conductor of a protected electrical system and fullwave rectifies the bandwidth limited di/dt signal for comparison with an instantaneous trip reference signal. The bandwidth is selected to provide a selected relative sensitivity of the instantaneous trip to sinusoidal currents associated with overcurrent faults and step currents associated with sputtering arc faults. The rectified bandwidth limited di/dt signal is also filtered and delayed for comparison with a delayed trip reference signal. The time constant for the filter is selected to provide a selected relative sensitivity of the delayed trip to overcurrent faults and sputtering arc faults. A low mu sensing coil used to generate the di/dt signal can also serve as the neutral current sensing coil of a dormant oscillator ground fault protection system.

Diagnostic system and method

Abstract: A diagnostic system wherein a central diagnostic center receives sensor data relative to the operating condition of a plurality of remote plants. Each plant records certain sensor signals and transmits them at respective prescheduled transmission times. If certain activation limits are exceeded, a data link with the diagnostic center is immediately established so that the data may be transmitted ahead of its normally scheduled transmission time in order that an immediate diagnostic analysis be on the plant. A communication link between the plant and diagnostic center is kept open for a predetermined period of time in which more data may be sent from the plant to the diagnostic center, and results and instructions, sent from the diagnostic center back to the plant

Dynamic Response of Anisotropic Laminated Plates Under Initial Stress to Impact of a Mass

Abstract: : The central impact of a mass on a simply-supported laminated composite plate under initial stress is investigated. The contact force and the dynamic response of the plate are obtained by solving a non-linear integral equation. The energy transferred from the mass to the plate during impact is also obtained by use of a normalized contact force. It is found that a higher initial tensile stress elevates the maximum contact force, but reduces the contact time, the deflection, and the stresses. It is also noted that a higher tensile initial stress results in less energy transfer from the striking mass to the plate.

Rapid zinc diffusion in gallium arsenide

Abstract: It is assumed that zinc acts as a donor when in interstitial positions in gallium arsenide, although it is an acceptor in its normal gallium substitutional positions. When the zinc doping is very heavy, a small fraction of the zinc should go into these donor interstitial positions and these should diffuse very rapidly thereby being dominant in the over-all diffusion process. Plausibility arguments are given for interstitial diffusion, and a critical test is suggested. In the case of tunnel diodes the deterioration due to interstitial impurity diffusion should be most rapid, as compared to slowest for substitutional diffusion, when the diode is forward biased.