Experimental Study of Fault Arc Protection Based on UV Pulse Method in High Voltage Switchgear

2014 ◽  
Vol 15 (3) ◽  
pp. 247-252
Author(s):  
Jingang Wang ◽  
Cheng Xu ◽  
Jiaxiang Sun
Keyword(s):  
Experimental Study ◽  
Ultraviolet Radiation ◽  
High Voltage ◽  
Pulse Method ◽  
Electrical Equipment ◽  
Electric Arc ◽  
Protection System ◽  
New Technique ◽  
Arcing Faults ◽  
The Relationship

Abstract Based on the relationship between electrical equipment discharge and ultraviolet radiation, this paper proposed the use of UV pulse method to detect switchgear arcing faults. Switchgear protection system based on this new technique detects arcing faults by analyzing the ultraviolet produced by electric arc. This technique was implemented and tested in laboratory, and the performance of the protection module was verified: it is capable of calculating the number of UV pulses quickly and precisely, which indicates the intensity of fault arc, and therefore it can be applied to arcing faults protection system for detecting faults.

Study of Fault Arc Protection Based on UV Pulse Method in High Voltage Switchgear

2013 ◽  
Vol 853 ◽  
pp. 641-645
Author(s):  
Cheng Xu ◽  
Jia Xiang Sun ◽  
Jin Gang Wang ◽  
Yi Luo
Keyword(s):  
Ultraviolet Radiation ◽  
High Voltage ◽  
Pulse Method ◽  
Electrical Equipment ◽  
Electric Arc ◽  
Protection System ◽  
New Technique ◽  
Arcing Faults ◽  
The Relationship

Based on the relationship between electrical equipment discharge and ultraviolet radiation, this paper proposed the use of UV pulse method to detect switchgear arcing faults. Switchgear protection system based on this new technique detects arcing faults by analyzing the ultraviolet produced by electric arc. The technique was implemented and tested in laboratory, and results verified the performance of the protection system; its capable to calculate the number of UV pulses and cut off faults fast and precisely.

scholarly journals The Relationship between the Damage Rate of High Voltage Electrical Equipment and Instrumental Seismic Intensity

2020 ◽  
Author(s):  
Rushan Liu ◽  
Mingpan Xiong ◽  
Deyuan Tian
Keyword(s):  
Wenchuan Earthquake ◽  
High Voltage ◽  
Electrical Equipment ◽  
Seismic Intensity ◽  
Probability Density Distribution ◽  
Damage Rate ◽  
Damage Probability ◽  
Instrumental Intensity ◽  
The Impact ◽  
The Relationship

Wenchuan earthquake that occurred in China in 2008 caused severe damage to a large number of electric substations. In this paper, Kriging interpolation method was used to calculate the impact area of the instrumental seismic intensity in Wenchuan earthquake, and to compare the intensities based on strong motion observation against the instrumental seismic intensities at locations where the observation data is available. The instrumental seismic intensities were calculated for the Wenchuan Earthquake at substations in the national power grid with voltage of 110kV or higher in areas of Mianyang, Deyang, Guangyuan and Chengdu. The cumulative Gaussian distribution function was then used to fit the relationship of the curves of the damage probabilities of high-voltage electrical equipment such as transformers, voltage mutual inductors, current mutual inductors, circuit breakers, isolating switches and lightning arrester with their instrumental seismic intensities. The damage probability density distribution curve of high-voltage electrical equipment based on the instrumental seismic intensities was obtained. The results showed that: (1) In the lower seismic intensity region, the mean instrumental seismic intensity was in good agreement with the traditional seismic intensity, but there was noticeable dispersion; in regions of intensity IX and above, the instrumental intensity was lower than the seismic intensity, but there was a lower degree of dispersion. (2) Among high-voltage electrical equipment, the transformers were most vulnerable to damage and they had some damage even under lower instrumental intensity. More damage would be produced when the instrumental intensity reached VIII or above; the second most vulnerable equipment was the circuit breaker, and the damage was most likely to occur when the instrument intensity was IX or above . (3) The damage rate curves of lightning arresters, current mutual inductors, voltage mutual inductors and isolating switches were relatively close to each other and the damage probability was the highest when the instrumental intensity was about X.

Quantity judgment and the mass-count distinction across languages: Advances, problems, and future directions for research

2018 ◽  
Author(s):  
David Barner ◽  
Alan Bale
Keyword(s):  
Experimental Study ◽  
Judgment Task ◽  
Scientific Enterprise ◽  
Future Directions ◽  
Quantity Judgment ◽  
The Relationship ◽  
Linguistic Cognition

We review advances in the experimental study of the mass-count distinction and highlight problems that have emerged. First, we lay out what we see to be the scientific enterprise of studying the syntax and semantics of mass-count distinction, and the assumptions we believe must be made if additional progress is to occur, especially as the empirical facts continue to grow in number and complexity. Second, we discuss the new landscape of cross-linguistic results that has been created by widespread use of the quantity judgment task, and what these results tell us about the nature of the mass-count distinction. Finally, we discuss the relationship between the mass-count distinction and non-linguistic cognition, and in particular the object-substance distinction.

External Investigators' Follow-Up Intentions When Whistleblowers Report Healthcare Fraud: The Effects of Report Anonymity and Previous Confrontation

2020 ◽  
Vol 32 (2) ◽  
pp. 91-101
Author(s):  
Steven E. Kaplan ◽  
Danny Lanier ◽  
Kelly R. Pope ◽  
Janet A. Samuels
Keyword(s):  
Experimental Study ◽  
Early Detection ◽  
Data Availability ◽  
Medical Provider ◽  
Perceived Credibility ◽  
The Relationship ◽  
Critical Investigation

ABSTRACT Whistleblowing reports, if properly investigated, facilitate the early detection of fraud. Although critical, investigation-related decisions represent a relatively underexplored component of the whistleblowing process. Investigators are responsible for initially deciding whether to follow-up on reports alleging fraud. We report the results of an experimental study examining the follow-up intentions of highly experienced healthcare investigators. Participants, in the role of an insurance investigator, are asked to review a whistleblowing report alleging billing fraud occurring at a medical provider. Thus, participants are serving as external investigators. In a between-participant design, we manipulate the report type and whether the caller previously confronted the wrongdoer. We find that compared to an anonymous report, a non-anonymous report is perceived as more credible and follow-up intentions stronger. We also find that perceived credibility fully mediates the relationship between report type and follow-up intentions. Previous confrontation is not significantly associated with either perceived credibility or follow-up intentions. Data Availability: Data are available upon request.

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