Results 181 to 190 of about 2,822 (222)

Use of true PD producing defects for calibration and sensitivity check of UWB PD sensors

2009 IEEE Electrical Insulation Conference, 2009
Predictive maintenance of high voltage equipment requires levels of partial discharge warning to trigger corrective action and prevent failures. This leads to the need of establishing a reliable way to compare readings from different on-line and conventional off-line partial discharge detection systems. To achieve comparable results, it is suggested to
openaire   +1 more source

INRIM–NMC Comparison of Pt/Pd Calibration Above the Ag Point

International Journal of Thermophysics, 2010
A comparison of a Pt/Pd calibration above the Ag point between the INRIM and NMC was arranged with the aims of evaluating measurement systems and exploiting the potential of the Pt/Pd thermocouples. Two commercial Pt/Pd thermocouples were used as transfer thermometers.
BATTUELLO, MAURO, GIRARD, FERRUCCIO, WANG L.   +2 more
openaire   +1 more source

Development of a partial discharge emulator for calibration of a radiometric PD detection system

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings, 2012
A purely electronic partial discharge emulator for use in a location estimation algorithm for online partial discharge detection is proposed as a low-cost approach to real-time condition monitoring, asset management and operation optimization in future smart grid. Some early progress in the development of subsystems (specifically the radiometer antenna
J. M. R. de Souza Neto, E. C. T. de Macedo, T. C. M. Cavalcanti, E. C. Guedes, J. S. da Rocha Neto, I. A. Glover   +5 more
openaire   +1 more source

On-beam calibration of the ΔE(Si)–Sci/PD charged particle telescope

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
Abstract The reaction products emitted in the 14 N (45 A MeV )+( CH 2 / CD 2 ) interactions are identified by a Δ E (Si)– E (Scintillator/Photodiode) telescope by the conventional Δ E – E method. The position of “jumps” in the amplitude of the photodiode signal for ions passing through the scintillator (Sci) is used to
V. Avdeichikov, B. Jakobsson, V.A. Nikitin, P.V. Nomokonov, E.J. van Veldhuizen   +4 more
openaire   +1 more source

Calibrating the UHF technique of partial discharge detection using a PD simulator

IEEE Transactions on Dielectrics and Electrical Insulation, 1995
The paper describes a technique for simulating the presence of partial discharges in gas-insulated substation (GIS) equipment. The technique employs a pulse generator to inject current pulses through a suitable protrusion. The current pulses have similar temporal characteristics to those produced by an actual discharge event, with the added advantage ...
A.G. Sellars, S.J. MacGregor, O. Farish
openaire   +1 more source

Calibrated flow reactor to determine reaction rates: CO–oxidation on Pd(110)

Journal of Vacuum Science and Technology, 1981
We describe the construction and the principles of operation of a flow reactor designed to obtain reaction rates of heterogeneous reactions over a wide pressure range. In this communication we restrict the discussion to the low pressure region and demonstrate the performance of the apparatus with transient reaction studies for the CO-oxidation reaction
Goschnick, J., Grunze, M.
openaire   +2 more sources

Simple Calibration Method for Improving the Comparability of PD Measurement Results at HVDC Conditions

2019
Partial discharge (PD) measurement at DC voltage becomes more and more important due to the increased application of HVDC components in electrical power systems. Numerous studies of PD behaviour on various type of insulation at DC have been currently performed to find out appropriate test methods and procedures as well as the physical behaviour of ...
Haller, Rainer, Hornak, Jaroslav, Martínek, Petr, Hlaváček, Jan   +3 more
openaire   +3 more sources

Design and Investigation of Pd–C Eutectic Fixed-Point Cells for Thermocouple Calibration at NMIA

International Journal of Thermophysics, 2017
The calibration of Pt/Rh thermocouples up to 1560  $$^{\circ }\hbox {C}$$ at NMIA currently uses the conventional ‘melt-wire technique’ to realize Gold (Au) and Palladium (Pd) melting points, resulting in ...
F. Jahan, H. Ogura, M. J. Ballico, E. W. M. van der Ham, N. Sasajima   +4 more
openaire   +1 more source

Pt/Pd thermocouple resilience over 327 operating hours in an industrial calibration laboratory

AIP Conference Proceedings, 2013
Two Pt/Pd thermocouples have been manufactured industrially at CCPI-Europe to a robust design optimised by NPL. The first has been exposed to temperatures up to 1000 °C for 93 operating hours and the second exposed to higher temperatures (up to 1300 °C) for 327 operating hours, over the course of a year.
C. J. Elliott, J. V. Pearce, G. Machin, T. Ford, K. Hicks   +4 more
openaire   +1 more source

Investigation of differently designed Pd–C eutectic fixed-point cells for the calibration of thermocouples

Metrologia, 2011
An interlaboratory comparison of the melting temperatures of three palladium–carbon (Pd–C) eutectic fixed-point cells of different designs and usable for the calibration of thermocouples was performed at NIM. Two Pt/Pd thermocouples were constructed for this particular purpose.
F Edler, W Zheng
openaire   +1 more source