Ground Fault Directional Protection Method for HVDC Multiterminal Networks

Author(s):  
Ricardo Granizo ◽  
Jose Manuel Guerrero ◽  
Fernando Alvarez ◽  
Carlos Antonio Platero
Energies ◽  
2015 ◽  
Vol 8 (2) ◽  
pp. 1291-1316 ◽  
Author(s):  
Ricardo Granizo ◽  
Francisco Blánquez ◽  
Emilio Rebollo ◽  
Carlos Platero

2016 ◽  
Vol 6 (1) ◽  
pp. 134-139
Author(s):  
Michiteru Koyanagi ◽  
Toshiaki Takino ◽  
Hitoshi Hayashiya ◽  
Shigeyasu Matsuoka ◽  
Akiko Kumada ◽  
...  

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3387 ◽  
Author(s):  
Ricardo Granizo Arrabé ◽  
Carlos A. Platero ◽  
Fernando Álvarez Gómez ◽  
Emilio Rebollo López

Ground faults in electrical power systems represent more than 90% of total faults. Their detection, location, and elimination are essential and must be carried out in a precise way to allow multiterminal high-voltage direct current (HVDC) cable networks to operate in stable conditions by removing only the faulty cable from service. This paper presents a new differential protection method based on the measurement of currents at both ends of the shields of power cables. This new method is cheaper and easier to set in operation compared to other protection methods that measure currents circulating in the active conductors. The values of such intensities and their polarities were evaluated to know which cable had a ground fault in a multiterminal HVDC cable network. The method was successfully validated by computer simulations, and experimental results were successfully obtained.


The choice of cost-effective method of anticorrosive protection of steel structures is an urgent and time consuming task, considering the significant number of protection ways, differing from each other in the complex of technological, physical, chemical and economic characteristics. To reduce the complexity of solving this problem, the author proposes a computational tool that can be considered as a subsystem of computer-aided design and used at the stage of variant and detailed design of steel structures. As a criterion of the effectiveness of the anti-corrosion protection method, the cost of the protective coating during the service life is accepted. The analysis of existing methods of steel protection against corrosion is performed, the possibility of their use for the protection of the most common steel structures is established, as well as the estimated period of effective operation of the coating. The developed computational tool makes it possible to choose the best method of protection of steel structures against corrosion, taking into account the operating conditions of the protected structure and the possibility of using a protective coating.


2009 ◽  
Vol 129 (10) ◽  
pp. 949-956
Author(s):  
Kohji Ajiki ◽  
Hiroaki Morimoto ◽  
Fumiyuki Shimokawa ◽  
Shinya Sakai ◽  
Kazuomi Sasaki ◽  
...  

2018 ◽  
Vol 138 (3) ◽  
pp. 206-211
Author(s):  
Kazunori Nishimura ◽  
Yusaku Marui ◽  
Wataru Sunayama

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