Power measuring device and power measuring method

Abstract

To provide an electric power measuring device that is capable of verifying whether or not a clamp type current sensor can measure current at a predetermined accuracy.SOLUTION: An electric power measuring device comprises: a main side current sensor which is provided on a path portion closer to a main power generator side than a load in a connection path which electrically connects the main power generator and a sub power generator via the load, and detects current flowing in the path portion; a sub-side current sensor which is provided on a path portion closer to the sub power generator side than the load in the connection path, and detects current flowing in the path portion; and a voltage sensor provided on the connection path. Therein the main side current sensor and the sub side current sensor are clamp type current sensors having a clamp part, and have a self-checking function that can check whether or not being capable of measuring current at a predetermined accuracy.SELECTED DRAWING: Figure 12

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