Application of high voltage gradient zinc oxide elements to SF/sub 6/ gas insulated surge arresters for 22 kV-765 kV power systems

1999 ◽  
Vol 14 (2) ◽  
pp. 419-424 ◽  
Author(s):  
S. Shirakawa ◽  
I. Ejiri ◽  
S. Watahiki ◽  
N. Iimura ◽  
S. Nakano ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Power Systems ◽  
High Voltage ◽  
Voltage Gradient ◽  
Surge Arresters

Improved zinc oxide surge arresters using high voltage gradient 300 V/mm, 400 V/mm ZnO elements

2000 ◽  
Vol 15 (2) ◽  
pp. 569-574 ◽  
Author(s):  
S. Shirakawa ◽  
S. Yamada ◽  
S. Tanaka ◽  
I. Ejiri ◽  
S. Watahiki ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
High Voltage ◽  
Voltage Gradient ◽  
Surge Arresters

Lightning Protection of Substations and the Effects of the Frequency-Dependent Surge Impedance of Transformers

2013 ◽  
pp. 398-437
Author(s):  
Rafal Tarko ◽  
Wieslaw Nowak
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Power Transmission ◽  
Electrical Power ◽  
Computer Calculation ◽  
Electrical Power Systems ◽  
Surge Arresters ◽  
Phase Conductors ◽  
Extra High Voltage ◽  
Economic Nature

The reliability of electrical power transmission and distribution depends upon the progress in the insulation coordination, which results both from the improvement of overvoltage protection methods and new constructions of electrical power devices, and from the development of the surge exposures identification, affecting the insulating system. Owing to the technical, exploitation, and economic nature, the overvoltage risk in high and extra high voltage electrical power systems has been rarely investigated, and therefore the theoretical methods of analysis are intensely developed. This especially applies to lightning overvoltages, which are analyzed using mathematical modeling and computer calculation techniques. The chapter is dedicated to the problems of voltage transients generated by lightning overvoltages in high and extra high voltage electrical power systems. Such models of electrical power lines and substations in the conditions of lightning overvoltages enable the analysis of surge risks, being a result of direct lightning strokes to the tower, ground, and phase conductors. Those models also account for the impulse electric strength of the external insulation. On the basis of mathematical models, the results of numerical simulation of overvoltage risk in selected electrical power systems have been presented. Those examples also cover optimization of the surge arresters location in electrical power substations.

A High-Voltage High-Speed AC Switch Based on Controlled Vacuum Surge Arresters

2018 ◽  
Vol 4 (4) ◽  
pp. 4-13
Author(s):  
Vladimir A. SIDOROV ◽  
◽  
Gennady D. DOMASHENKO ◽  
Marat R. AKHMETGAREYEV ◽  
Yurii V. SHCHERBAKOV ◽  
...  
Keyword(s):  
High Voltage ◽  
High Speed ◽  
Surge Arresters

scholarly journals A Review of Techniques for RSS-Based Radiometric Partial Discharge Localization

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 909
Author(s):  
David W. Upton ◽  
Keyur K. Mistry ◽  
Peter J. Mather ◽  
Zaharias D. Zaharis ◽  
Robert C. Atkinson ◽  
...  
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Partial Discharge ◽  
Specific Area ◽  
Electrical Insulation ◽  
Acoustic Detection ◽  
Advantages And Disadvantages ◽  
Initial Stage ◽  
Catastrophic Failures ◽  
Radiometric Detection

The lifespan assessment and maintenance planning of high-voltage power systems requires condition monitoring of all the operational equipment in a specific area. Electrical insulation of electrical apparatuses is prone to failure due to high electrical stresses, and thus it is a critical aspect that needs to be monitored. The ageing process of the electrical insulation in high voltage equipment may accelerate due to the occurrence of partial discharge (PD) that may in turn lead to catastrophic failures if the related defects are left untreated at an initial stage. Therefore, there is a requirement to monitor the PD levels so that an unexpected breakdown of high-voltage equipment is avoided. There are several ways of detecting PD, such as acoustic detection, optical detection, chemical detection, and radiometric detection. This paper focuses on reviewing techniques based on radiometric detection of PD, and more specifically, using received signal strength (RSS) for the localization of faults. This paper explores the advantages and disadvantages of radiometric techniques and presents an overview of a radiometric PD detection technique that uses a transistor reset integrator (TRI)-based wireless sensor network (WSN).

Analysis of Unsymmetrical Faults in High Voltage Power Systems With Superconducting Fault Current Limiters

2007 ◽  
Vol 17 (2) ◽  
pp. 2347-2350 ◽  
Author(s):  
M. Stemmle ◽  
C. Neumann ◽  
F. Merschel ◽  
U. Schwing ◽  
K.-H. Weck ◽  
...  
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Fault Current ◽  
Fault Current Limiters
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