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Topic Area: Energy
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Displaying records 311 to 320 of 398 records.
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311. The Fallacy of Monitoring Surge Voltages: SPDs and PCs Galore
Topic: Energy
Published: 6/1/1999
Authors: A. Mansoor, K. O. Phipps, Francois D. Martzloff
Abstract: To support the recommendation of shifting transient monitoring from voltage surges to current surges, the paper presents experimental results as well as numerical modeling results demonstrating two mechanisms causing an apparent decrease of surge act ...

312. An Analysis of Efficiency Testing Under the Energy Policy and Conservation Act: A Case Study with Application to Distribution Transformers
Series: Technical Note (NIST TN)
Report Number: 1427
Topic: Energy
Published: 4/1/1999
Authors: Ken L. Stricklett, M Vangel, O. Petersons
Abstract: The protocols for efficiency testing promulgated by 10 CFR part 430 and established under the Energy Policy and Conservation Act of 1975 as amended (EPCA) are discussed. The case of distribution transformers, which are covered under the proposed new ...

313. Calibration of Dissipation Factor Standards
Topic: Energy
Published: 4/1/1999
Authors: Eric D Simmon, Gerald J FitzPatrick, O. Petersons
Abstract: Working standards for dissipation factor (D) standards obtained by connecting a shielded three-terminal capacitor in series with a shielded precision resistor have been developed for calibration purposes. Precision conductance boxes have been built ...

314. Extension of Voltage Range for Power and Energy Calibrations
Topic: Energy
Published: 4/1/1999
Authors: O. Petersons, Thomas L Nelson, Nile M. Oldham, Gerald J FitzPatrick
Abstract: A special purpose ac voltage divider system with ratios of 600, 480, 360, 277, and 240 V to 120 V has been developed to extend the range of primary electric power calibrations from 120-600 V at 50 and 60 Hz. The developmental goal has been to real ...

315. Testing of Interaction-driven Manufacturing Systems
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6260
Topic: Energy
Published: 12/2/1998
Authors: Katherine C Morris, David W Flater, Don E Libes, Albert W Jones
Abstract: As automation of manufacturing processes becomes more widespread, manufacturing systems are becoming more and more software dependent. At the same time, the software used is becoming more and more modularized allowing for the creation of customized s ...

316. Extremely Low Frequency Electric and Magnetic Field Measurement Methods
Topic: Energy
Published: 12/1/1998
Author: Martin Misakian
Abstract: During the early 1970's, reports originating in the Soviet Union described a variety of ill effects experienced by personnel working in 500 kV and 750 kV switchyards [1,2],. The effects were attributed to the presence of the ac electric fields as we ...

317. Exposure Systems
Topic: Energy
Published: 11/1/1998
Author: Martin Misakian

318. Gapped Arresters Revisited: A Solution to Cascade Coordination
Topic: Energy
Published: 10/1/1998
Authors: A. Mansoor, Francois D. Martzloff, K. O. Phipps
Abstract: 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 i ...

319. The Dilemma of Surge Protection vs. Overvoltage Scenarios: Implications for Low-Voltage Surge-Protective Devices
Topic: Energy
Published: 10/1/1998
Authors: A. Mansoor, Francois D. Martzloff
Abstract: The application of surge-protective devices in low-voltage systems faces the dilemma of providing effective limiting against surges while not attempting to limit the temporary overvoltages that do occur in a power system. The paper illustrates this ...

320. What Are the Lights on Your Surge Protector Telling You
Topic: Energy
Published: 8/1/1998
Author: Francois D. Martzloff
Abstract: 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 consisten ...

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