Digital Commons @ New Jersey Institute of Technology (NJIT)

    Remote measurement calibration in power system

    Get PDF
    Power system reliability and economy of operation require accurate measurements of current, voltage, real and reactive powers. These measurements are transmitted to a control center of a power system for monitoring, display, and use in power system real-time analysis. The number of measurements is in thousands. Routinely field technicians must calibrate transducers and/or determine other sources of metering errors. Due to the large number of measurements and the time required to check each individual measurement, field calibration procedures are impractical, expensive, and not timely. There has been a need for a more efficient approach to measurement calibration and identification of defective instruments. This paper describes an approach which meets the need. The collection of measurements over time are used to correct for systematic errors, (caused by instrument transformers, transducers, secondary leads between these devices, analog-digital converters, and the scaling procedure). The volts, watts, and vars scales are then adjusted to compensate for these errors, thus providing more accurate measurements

    Modeling of deformed swept volumes with SDE and its applications to NC simulation and verification

    Get PDF
    Representation of swept volumes has important applications in NC simulation and verification as well as robot-motion planning. Most research on .the representation of swept volumes has been limited to rigid objects. In this study, a sweep deferential equation (SDE) approach is presented for the representation of deformed swept volumes generated by flexible objects. The deformed swept volume analysis is integrated with machining physics to account for tool deformation/deflection for the NC simulation. End milling is modeled and analyzed and the tool deformations are calculated and integrated with the SDE program. A program is developed in C++ for the generation of deformed swept volumes. Using Boolean subtraction, the deformed swept volume of the tool is cut from the workpiece to simulate the machined part. It is shown that this representation approach constitutes an efficient and accurate NC simulation technique for collision detection, geometric verification as well as surface error prediction
    Digital Commons @ New Jersey Institute of Technology (NJIT)is based in US
    Do you manage Digital Commons @ New Jersey Institute of Technology (NJIT)? Access insider analytics, issue reports and manage access to outputs from your repository in the CORE Dashboard!