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Displaying 526 - 550 of 607

Gapped Arresters Revisited: A Solution to Cascade Coordination

October 1, 1998
Author(s)
A. Mansoor, Francois D. Martzloff, K. O. Phipps
This paper provides a brief perspective on how the coordination of cascaded surge-protective devices (SPDs) has become an issue. We propose an approach where the 'ancient' technology of gapped arresters may well be the answer to the dilemma of the

What Are the Lights on Your Surge Protector Telling You

August 1, 1998
Author(s)
Francois D. Martzloff
Surge-Protective devices (SPD) applied in low-voltage ac power circuits should be provided with appropriate means to disconnect a failed SPD from the power system and provide a clear indication of the SPD status. This objective has not been consistently

Calibration of Dissipation Factor Standards

July 1, 1998
Author(s)
Eric D. Simmon, Gerald FitzPatrick, O. Petersons
Dissipation factor (D) standards obtained by connecting a shielded three-terminal capacitor in series with a shielded resistor have been developed for calibration purposes. An analysis of these DF Standards, including precautions in their construction and

Extension of Voltage Range for Power and Energy Calibrations

July 1, 1998
Author(s)
O. Petersons, Thomas L. Nelson, Nile M. Oldham, Gerald FitzPatrick
A special purpose ac voltage divider system having voltage ratios of 600 V, 480 V, 360 V, and 240 V to 120 V has been developed to extend the voltage range of primary electric power calibrations from 120 volts to 600 volts at power frequencies of 50 and 60

Power and Energy Measurements at NIST

July 1, 1998
Author(s)
Thomas L. Nelson
The NIST calibration service that provides electric energy traceability for the U.S. utility industry is described. Electronic watthour meters, submitted for test, are measured using the NIST Power Bridge, in which complex ac power is defined in terms of

Digital Recording and Analysis of Positive Partial Discharges in Air

November 1, 1997
Author(s)
Yicheng Wang, X. Han, Richard J. Van Brunt, J. C. Horwath, D. L. Schweickart
A new Surface-mediated burst mode of partial discharges is discovered in which a partial discharge pulse has a fixed probability to induce a following pulse, forming a burst of evenly separated pulses. The probability is determined for several gap voltages

A Mixed-Mode Smart Transducer Interface for Sensors and Actuators

October 15, 1996
Author(s)
S Chen, Kang B. Lee
This article discusses some of the key issues of the proposed IEEE P1451.4 standard ? the existing mixed-mode transducer communication schemes, the Transducer Electronic Data Sheet (TEDS) requirements, compatibility with legacy systems, and utilization of
Displaying 526 - 550 of 607
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