CURRENT-LIMITING/FLOW CONTROL DEVICE

摘要

A current-limiting and power-flow control device (10) according to the present invention includes a superconducting current-limiting element (8) including a superconductor, a series capacitor (1), and a parallel circuit. The series capacitor (1) is connected in series with the superconducting current-limiting element (8). The parallel circuit includes a reactor (2) connected in parallel with a series circuit including the superconducting current-limiting element (8) and the series capacitor (1). Accordingly, overcurrent at the time of occurrence of a fault causes transition of the superconductor of the superconducting current-limiting element (8) to the normal conducting state, and thus causes autonomous current-limiting operation of the superconducting current-limiting element (8). Thus, application of an excessive load (excessive voltage) across the terminals of the series capacitor (1) due to the aforementioned fault can surely be prevented. Accordingly, unlike the conventional device, it is unnecessary to install an arrester for protection of the series capacitor (1) and the configuration of the current-limiting and power-flow control device (10) can be simplified.