Abstract
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.
Highlights
The first electric distribution networks were operated in direct current (DC), the technology at the time made it difficult to implement this standard system of energy transport due to expensive installations and losses in the conductors
A (Stretch 1) at 25 km from high-voltage direct current (HVDC) Station A are shown in Figures 10 and 11
The strategy of this novel method described, simulated, and tested in laboratory is the. The strategy of this novel method described, simulated, and tested in laboratory is the measurement of polarities of the currents that circulate at the ends of the shields of every cable measurement of polarities of the currents that circulate at the ends of the shields of every cable that that form a multiterminal HVDC cable network
Summary
The first electric distribution networks were operated in direct current (DC), the technology at the time made it difficult to implement this standard system of energy transport due to expensive installations and losses in the conductors. Improvements in the design of AC generators and the invention of the transformer enabled the generation and transportation of electricity to be carried out in a more economical way through high-voltage alternating current (HVAC). Despite the advantages that HVAC systems provide in principle, when the transport distances in HVAC lines increases, problems associated with stability arise. These problems are related to the reactive energy between the capacitances and the inductances of the system. A quick identification of power quality disturbances must be considered [1]. In this situation, the high-voltage direct current (HVDC) system presents several advantages compared to the traditional
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