Reliability Estimation of Electricity Distribution Substation Surge Protection System Composed by Surge Arresters with Different Operational Parameters

2017 ◽  
pp. 201-209 ◽  
Author(s):  
Nikolay Nikolov ◽  
Neli Dimitrova ◽  
Anton Georgiev ◽  
Margreta Vasileva
Keyword(s):  
Reliability Estimation ◽  
Protection System ◽  
Electricity Distribution ◽  
Operational Parameters ◽  
Surge Arresters ◽  
Surge Protection

scholarly journals Development issues of catenary surge protection system based on a varistor surge arresters

2018 ◽  
Vol 19 (6) ◽  
pp. 43-46
Author(s):  
Andrzej Białoń ◽  
Łukasz Zawadka
Keyword(s):  
Test Section ◽  
Low Voltage ◽  
Wave Impedance ◽  
Protection System ◽  
Surge Arresters ◽  
A Value ◽  
Optimal Distance ◽  
Surge Protection

The article presents na issue of determinating an optimal distance between varistors located on 3 kV DC catenary. Line attenuation as a function of distance has been determined during preliminary tests for the following measurement configurations: catenary network unloaded (open), catenary network charged by a value of resistance close to the value of wave impedance of the catenary network test section, catenary network charged by a low voltage varistor. The results allowed to estimate the optimal distance between the varistors and they were verified on the catenary network on Żmigród Test Ring using a surge generator with an amplitude of about 15 kV and varistors designed to work in railway enviroment. The methodology and results of these studies were presented and analyzed in this paper.

Surge protection with metal oxide (ZnO) surge arresters in multi-line underground power systems

1987 ◽  
Vol 12 (1) ◽  
pp. 19-26 ◽  
Author(s):  
J. Banda ◽  
S.M. Shahidehpour
Keyword(s):  
Metal Oxide ◽  
Power Systems ◽  
Surge Arresters ◽  
Surge Protection

scholarly journals Voltage characteristic as a parameter for surge arrester diagnosing

2021 ◽  
pp. 40-44
Author(s):  
En Dar Kim ◽  
Ian Korostelev
Keyword(s):  
Discharge Voltage ◽  
Electromagnetic Signal ◽  
Voltage Measurement ◽  
Surge Arresters ◽  
Remote Maintenance ◽  
Insulation Degradation ◽  
In Series ◽  
Protection Devices ◽  
Radio Transceiver ◽  
Surge Protection

An alternative method for field MOV surge arresters diagnosing was observed, the controlled characteristic was the surge voltage of a gap arrester. The condenser that was connected in series with gap arrester was applied as voltage measurement sensor. Electrical aging of active elements (MOV), surge arrester insulation degradation and other types of electric faults causes to voltage increase at capacitor. The voltage value can be measured directly or the energy stored in capacitor can be transformed to electromagnetic signal and, then, registered remotely by specific radio transceiver. The capacitor connected in series with the surge arrester can also be used for leakage current limitation during all the life period of surge arrester. Shunted with a spark gap and presented as the low-current gap arrester with pre-sated discharge voltage glass (porcelain) pin-cap insulator can be the simplest, but reliable sensor.  Taking into consideration modern technologies the surge arrester statement continuous monitoring system can be designed. It also allows locating the place of damaged arrester that is particularly true for remote maintenance of equipped with surge protection devices electrical

scholarly journals Surge protection system development in centrifugal compressor with an indicative method using numerical simulation of unsteady processes and analysis of pressure fluctuation signals

2018 ◽  
Vol 245 ◽  
pp. 09010 ◽  
Author(s):  
Alexandr Lebedev ◽  
Lyubov Gileva ◽  
Alexey Danilishin ◽  
Mikhail Sokolov
Keyword(s):  
Centrifugal Compressor ◽  
System Development ◽  
Parametric Method ◽  
Pressure Fluctuations ◽  
Information Criterion ◽  
Rotating Stall ◽  
Protection System ◽  
Low Flow ◽  
Surge Protection ◽  
Unsteady Processes

Nowadays, anti-surge protection system based on parametric method is widely used. The disadvantage of this anti-surge system is the fact that it is not possible to fully ensure the safe operation of the compressor at low flow conditions, because large measurement error will occur. Other method of anti-surge protection is indicative method. This method is what it is necessary to detect occurrence of rotating stall in time on the score of information criterion. Further the control decision is accepted in connection with the approach to the danger zone of surge. Indicative method is more complicated and requires special signal analysis such as wavelet analysis, correlation analysis. Also in addition to the methods of analysis, important is the length of the sample for processing unsteady pressure fluctuations and the method of its displacement on time. It is now possible to mathematically pre-simulate unsteady processes in the flow part of centrifugal compressor.

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