INSERTION TYPE CONNECTION UNIT

To provide an insertion type connection unit having a function in which an appropriate amount of a leakage current is flowed in accordance with a level of a grounding resistance value over time to check whether a grounding resistance is normally functioning.SOLUTION: An insertion type connection unit includes: a plug blade inserted in response to a plug receiver at each pole provided in a receptacle; a power supply circuit electrically connected to the plug blade to obtain driving power; a current generation part for flowing an electric current between a neutral pole and a grounding pole in a receptacle circuit; a voltage measurement part for measuring a voltage between the neutral pole and the grounding pole; and a grounding resistance calculation part for calculating a grounding resistance from the electric current generated from the current generation part and the voltage measured by the voltage measurement part. A repetition confirmation part is also provided that makes the grounding resistance calculation part calculate a grounding resistance at a predetermined time interval. By the obtaining of a level of the grounding resistance that changes within a predetermined time period, a time period, when an operation current of a ground-fault circuit interrupter cannot be output sufficiently with the amount of the electric current capable of being outputted from the current generation part, is predicted.SELECTED DRAWING: Figure 1 【課題】経年的な接地抵抗値の大きさに合わせて適切な大きさの漏電電流を流し、接地抵抗が正常に機能しているか否かを確認する機能を備えた差込接続ユニットを提供する。【解決手段】コンセントに設けられた夫々の極におけるプラグ受けに対応して差し込まれるプラグ刃と、該プラグ刃に電気的に接続されて駆動用電源を取得する電源回路と、前記コンセント回路における中性極と接地極との間に電流を流す電流発生部と、前記中性極と接地極との間の電圧を測定する電圧測定部と、前記電流発生部から発生させた電流と電圧測定部により測定した電圧とから接地抵抗を演算する接地抵抗演算部とを備えるとともに、接地抵抗演算部に所定の時間間隔で接地抵抗を演算させる反復確認部を設け、一定期間に変化する接地抵抗の大きさを求めて、前記電流発生部から出力可能な大きさの電流では漏電遮断器の動作電流を出力できなくなる時期を予測することを特徴として提供した。【選択図】図１