Power measurement device, determination method, and recording medium for identification of current detection element disposed in an incorrect direction

A determination method to determine whether or not a current detection element of a plurality of current detection elements is disposed in a correct direction, the method comprising:

• measuring a voltage in each phase of a plurality of phases applied to a plurality of power lines feeding power in the plurality of phases;
• measuring, through the plurality of current detection elements disposed on the plurality of power lines, a current input to equipment connected with the power line, or a current output by the equipment for each of the plurality of current detection elements;
• measuring, for each current detection element, electric energy supplied to the equipment or electric energy supplied from the equipment based on the measured current and the measured voltage;
• storing a sign table indicating which of a positive sign, a negative sign and both positive and negative signs the measured electric energy should have when the current detection element is disposed in a correct direction on the power line for each power line;
• accepting, from a user, disposition information indicating on which power line the current detection element is disposed, for each of the plurality of current detection elements;
• generating sign information indicating which of a positive sign, negative sign and both positive and negative signs the measured electric energy should have when the current detection element is disposed in a correct direction on the power line based on the stored sign table and the accepted disposition information for each of the plurality of current detection elements;
• storing the generated sign information;
• and
• determining that, when a sign indicated by the stored sign information is inconsistent with a sign of the measured electric energy, the current detection element is disposed in an incorrect direction on the power line.

A non-transitory computer readable recording medium having stored therein a program for causing a computer to function as:

• a voltage measuring function of receiving, from a voltage measurer being configured to measure a voltage in each phase of a plurality of phases applied to a plurality of power lines feeding power in the plurality of phases, a measured value of the voltage in each phase;
• a current measuring function of receiving a measured value of the current, from a current measurer configured to measure, through a plurality of current detection elements disposed on the plurality of power lines, a current input to equipment connected with the power line, or a current output by the equipment for each of the plurality of current detection elements;
• a power measuring function of measuring, for each current detection element, electric energy supplied to the equipment or electric energy supplied from the equipment based on the measured current value received by the current measuring function and the measured voltage value received by the voltage measuring function;
• a sign table storing function of storing sign information indicating which of a positive sign, a negative sign and both positive and negative signs the electric energy measured by the power measuring function should have when the current detection element is disposed in a correct direction on the power line for each power line;
• an accepting function of accepting, from a user, disposition information indicating on which power line the current detection element is disposed, for each of the plurality of current detection elements;
• a sign information generating function of generating sign information indicating which of a positive sign, a negative sign and both positive and negative signs the electric energy measured by the power measuring function should have when the current detection element is disposed in a correct direction on the power line based on the sign table stored by the sign table storing function and the disposition information accepted by the accepting function, for each of the plurality of current detection elements;
• a sign information storing function of storing the sign information generated by the sign information generating function;
• and
• a controlling function of determining that, when a sign indicated by the sign information stored by the sign information storing function is inconsistent with a sign of the electric energy measured by the power measuring function, the current detection element is disposed in an incorrect direction on the power line.