DC CUTOFF DEVICE

PROBLEM TO BE SOLVED: To provide a DC cutoff device that enables bi-directional current blocking and that can suppress an arc at the time of opening of a mechanical contact without using a semiconductor switch.SOLUTION: A mechanical circuit breaker CB is connected between a positive terminal of a first DC system 1 and a positive terminal of a second DC system 2. One end of a first capacitor C1 is connected with the positive terminal of the first DC system 1 and a common connection point of the mechanical circuit breaker CB. A cathode of a first diode D1 is connected with the other end of the first capacitor C1. An anode of the first diode D1 is connected with the positive terminal of the second DC system 2 and the common connection point of the mechanical circuit breaker CB. One end of a second capacitor C2 is connected with the positive terminal of the first DC system 1 and the common connection point of the mechanical circuit breaker CB. An anode of a second diode D2 is connected with the other end of the second capacitor C2. A cathode of the second diode D2 is connected with the positive terminal of the second DC system 2 and the common connection point of the mechanical circuit breaker CB.SELECTED DRAWING: Figure 1 【課題】双方向の電流遮断が可能で、かつ、半導体スイッチを用いずに機械接点開極時のアークを抑制できる直流遮断装置を提供する。【解決手段】第１直流系統１の＋端子と第２直流系統２の＋端子との間に機械遮断器ＣＢを接続する。第１直流系統１の＋端子と機械遮断器ＣＢの共通接続点に第１コンデンサＣ１の一端を接続する。第１コンデンサＣ１の他端には第１ダイオードＤ１のカソードを接続する。第１ダイオードＤ１のアノードは第２直流系統２の＋端子と機械遮断器ＣＢの共通接続点に接続する。第１直流系統１の＋端子と機械遮断器ＣＢの共通接続点に第２コンデンサＣ２の一端を接続する。第２コンデンサＣ２の他端には第２ダイオードＤ２のアノードを接続する。第２ダイオードＤ２のカソードは第２直流系統２の＋端子と機械遮断器ＣＢの共通接続点を接続する。【選択図】図１