Abstract
Recently, a lot of interesting research has been conducted to solve the fault current problem of the DC system. In long-distance transmission, DC transmission is more economical than AC transmission. The connection of power grids with a DC system can also better control the power flow and provide high stability. However, the control of the fault current in a DC system is more difficult to handle than in an AC system because the DC system does not make a zero point, unlike the AC system. In addition, there is a disadvantage, in that an arc occurs when a circuit breaker operates. In this paper, a new type of DC superconducting fault current limiter (SFCL) is proposed. This new type of SFCL is composed of two superconducting elements, a current limiting resistor/reactor (CLR), and a transformer. With the proposed SFCL, the DC fault current limiting experiments were performed and the DC fault current limiting characteristics of this SFCL due to the component of the CLR were analyzed.
Highlights
With the development of the power transmission method, the power transmission loss is reduced by transmitting power at a high voltage
Using a transformer, transformer and the power burden of the superconducting element is shared by utilizing theand turn the superconducting element RSC2 is designed to connect into the secondary side of the transformer ratio of the transformer
In case of RS = 2.3 Ω, as shown in Figure 4b, the currents flowing into the two superconducting elements (ISC1, in RSC2 (ISC2) ) seemed to simultaneously exceed the critical current, the current in the primary winding of the transformer (IN1 ), i.e., the current of the current limiting resistor/reactor (CLR), did not largely increase in the initial fault time because of the larger resistance of the CLR than the CLR with 1.15 Ω
Summary
With the development of the power transmission method, the power transmission loss is reduced by transmitting power at a high voltage. Energies 2020, 13, x FOR PEER REVIEW of 13 it may be more economical to apply an SFCL than the cost of replacing the entire circuit breaker with a larger breaking capacity. It can be expected to have a large economic effect in these underway to apply SFCL to the transmission lines, and in Japan, an SFCL for application in the areas. Research on SFCL has been actively conducted, and in the introduction of a large-capacity not always be economical in terms of price, France, research is underway to apply SFCLSFCL to themay transmission lines, and in Japan, an SFCL for theapplication introduction of an SFCL hasline a great advantage in terms of performance to any other in the distribution is being developed. Fault current limiting characteristics of abyDC transformer, improve breaker operation. Characteristics due to the component of the current limiting resistor/reactor (CLR) comprising the DC
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