MONITORING DEVICE, DETERMINATION DEVICE, GROUND FAULT MEASURING DEVICE, MONITORING METHOD, DETERMINATION METHOD, AND MEASURING METHOD

To detect the occurrence of ground fault more simply in a photovoltaic power generation system.SOLUTION: A monitoring device includes: a first measuring unit for measuring an output of a generation unit including a solar cell panel; a communication unit for differentially transmitting first measurement information indicating a measurement result of the first measuring unit via power lines; and a second measuring unit for measuring a first voltage between one line of the power lines and the ground and a second voltage between the other line of the power lines and the ground at the output end side of the communication unit. The communication unit further differentially transmits second measurement information indicating a measurement result of the second measuring unit via the power lines.SELECTED DRAWING: Figure 5 【課題】太陽光発電システムにおいて、地絡の発生をより簡易に検知する。【解決手段】監視装置は、太陽電池パネルを含む発電部の出力を計測する第１の計測部と、前記第１の計測部の計測結果を示す第１の計測情報を電力線を介して差動伝送する通信部と、前記通信部の出力端側において、前記電力線の一方の線およびグランド間の第１の電圧、および前記電力線の他方の線およびグランド間の第２の電圧を計測する第２の計測部を備え、前記通信部は、さらに、前記第２の計測部の計測結果を示す第２の計測情報を前記電力線を介して差動伝送する。【選択図】図５