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In some aircraft with traditional distribution electrical systems, the sources, distribution, and electrical loads are fully coupled. The control surfaces in traditional aircraft are based on cables and hydraulic actuators. Furthermore, the system stability mainly related to the hydraulic system and a small portion of it is related to the electrical system reliability. However, for aircraft like A380...
Turbine-generator set integrated with the thyristor-based rectifier system provides the dc power for the emerging medium voltage dc (MVDC) shipboard electrical distribution systems. Active foldback via firing-angle control can be implemented in the thyristor rectifier to protect the primary distribution bus, thereby possibly eliminating the bulky dc circuit breakers. This paper presents the detailed...
Current-limiting reactors are often used in applications where high fault currents encroach or exceed rated fault duties of downstream switchgear. Transient Recovery Voltages (TRV) that develop across the vacuum or SF6 interrupter contacts of the circuit breaker directly in series with the reactor during the interruption of reactor terminal faults can exceed TRV limits published for specific circuit...
Connection of distributed generators to the distribution network increases the fault current level. Increase in fault current disturbs the operation of existing protection system and circuit breakers. As a result, it is important to reduce the short circuit current. Practically, the fault current reduction techniques are performed by using current limiting reactor (CLR) and fault current limiter (FCL)...
The rapid increase in installed distributed generation (DG) has led to concerns about the impact on the proper operation of the protection system. In particular, the limited fault current capability of inverter interfaced distributed generation (IIDG) could lead to malfunctioning of the distribution network protection system which largely relies on overcurrent based protection techniques. The absence...
The interconnection of distributed generation (DG) into the power distribution system creates many challenges for utilities. Many of these challenges are related to the type of interconnection transformer (or lack thereof) and consequently the grounding used for the DG interconnection. There remains confusion about the various transformer types for DG interfacing. This is a critical point because...
This paper presents a novel approach for providing long-run incremental cost (LRIC) pricing in network charging. The proposed approach reflects the cost imposed on a network from the increases in fault current levels when connecting new generators or inductors. In this paper, the LRIC pricing principles have been adopted for network's circuit breakers, reflecting the cost of advancing or deferring...
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