Results 11 to 20 of about 2,849 (260)

New Synthetic Partial Discharge Calibrator for Qualification of Partial Discharge Analyzers for Insulation Diagnosis of HVDC and HVAC Grids

Sensors, 2023
A synthetic partial discharge (PD) calibrator has been developed to qualify PD analyzers used for insulation diagnosis of HVAC and HVDC grids including cable systems, AIS, GIS, GIL, power transformers, and HVDC converters.
Abderrahim Khamlichi, Fernando Garnacho, Pascual Simón   +2 more
doaj   +2 more sources

Evaluation of a calibration technique in measuring partial discharges inside mineral oils with a high‐frequency current transformer (HFCT) sensor: A case study

IET Generation, Transmission & Distribution, 2023
Partial discharge is one of the main reasons for insulation degradation in high‐voltage apparatuses. Partial discharge is an ineluctable phenomenon that happens when a high electrical field is adjacent to an insulator. High‐frequency current transformers
Hamidreza Besharatifard, Saeed Hasanzadeh, S M Muyeen, Innocent Kamwa   +3 more
doaj   +2 more sources

Partial discharge and interference discrimination in gas-insulated systems using electric and magnetic sensors

International Journal of Electrical Power & Energy Systems
The correct identification of partial discharges (PDs) is instrumental for the maintenance plan in gas-insulated systems (GIS). However, onsite PD measurements are difficult, especially in HVDC systems, where partial discharges can be confused with ...
Christian Mier, Armando Rodrigo Mor, Tianming Luo, Peter Vaessen   +3 more
doaj   +2 more sources

Evaluation of Uncertainty in Partial Discharge Measurement: A Case Study

IEEE Access
ISO/IEC 17025:2017 recommends all accredited laboratories under this standard, performing testing and calibration, shall identify and evaluate the contributions to the uncertainty of their measurements.
Asif Islam, Md Shafiullah, Amjad Ali, Md Shafiul Alam, Waleed Hamanah, Rabiul Alam   +5 more
doaj   +2 more sources

Partial discharge calibrator of a cavity inside high-voltage insulator

Open Engineering, 2022
This article displayed the method of partial discharge (PD) measurement in high-voltage insulator and calibrating the effective element (capacitor) to enhance the PD signal.
Hamoodi Ali N., Hamoodi Safwan A., Mohammed Rasha A.   +2 more
doaj   +1 more source

A comparative study on partial discharge emulators. [PDF]

, 2020
Partial Discharge (PD) detection plays a vital role in electrical power stations, it can help protecting the high voltage equipment, it can prevent explosion of these equipment and hence preventing a catastrophic failure. PD detection can be performed in
Mahmud A. Yusuf, Alrweg, Mohmad, Umar Khan, Mohammed Alhaj, Khan, Umar; id_orcid, Mohmad Alrweg, Alhaj, Mohammed, Hamd Mohamed, Khan, Umar, Alkhweldi, Marwan, Mohammed, Mahmoud M., Mohamed, Hamd, Yusuf, Mahmud A., Marwan Alkhweldi, Mahmoud M. Mohammed   +14 more
core   +1 more source

Partial discharge detection on power equipment using a magneto-resistive sensor

, 2023
Partial discharges (PD) detection is an effective diagnostic method to assess the insulation condition of electrical power equipment in the high-voltage laboratory or field tests.
Ghaffarian Niasar, M. (author), Ghaffarian Niasar, M., Chen, Y., Castro Heredia, L.C., Chen, Y. (author), Smit, J.J. (author), Smit, J.J., Ross, Robert, Ross, Robert (author), Castro Heredia, L.C. (author)   +9 more
core   +1 more source

Precise calibration of LIGO test mass actuators using photon radiation pressure [PDF]

, 2009
Precise calibration of kilometer-scale interferometric gravitational wave detectors is crucial for source localization and waveform reconstruction. A technique that uses the radiation pressure of a power-modulated auxiliary laser to induce calibrated ...
Kawabe, K., Sigg, D., Marka, S., Kalmus, P., O'Reilly, B., Goetz, E., Riles, K., Landry, M., Savage, R. L., Savage, R. L., Jr., Erickson, S., O\u27Reilly, B., Goetz, Evan A., Gonzalez, G., Willems, P.   +14 more
core   +1 more source

Relative mRNA quantification graphs of the risk markers comparing PD patients with each control group.

, 2012
A one-way ANOVA and tukey-kramer post-hoc analysis was used to compare PD patients with HC, MSA and PSP controls separately. Fold change values relative to a calibrator are displayed with error bars indicating SEM. Gapdh mRNA was used as a reference gene
Bernard M. Ravina (141224), Judith A. Potashkin (78869), Alexey A. Leontovich (141234), Jose A. Santiago (141219), Arthur Watts (141231)   +4 more
core   +1 more source

Investigation of propagation of partial discharges in power transformers and techniques for locating the discharge

, 2005
The location of partial discharges in a power transformer can be determined based on the characteristics of the transfer function from the discharge source to the measuring terminal.
Crossley, P.A., Crossley, P. A., Hettiwatte, S.N., Wang, Z.D., Hettiwatte, S. N., Wang, Zhong Dong   +5 more
core   +1 more source