Power measuring system, measuring apparatus, load terminal, and device control system

A power measuring system comprising:

• a voltage sensor for detecting a voltage waveform of a power line in a noncontact manner through electrostatic coupling;
• a current sensor for detecting a current waveform of said power line in a noncontact manner through electromagnetic inductive coupling;
• a measuring apparatus including first communication means and a control portion which is connected to said voltage sensor and said current sensor;
• and
• a load terminal connected to said power line and including a load of a predetermined value, second communication means for communicating with said first communication means, and a measuring portion for measuring an effective value of a current flowing through said load and an effective value of a voltage of said power line,
• wherein the measuring portion of said load terminal transmits the effective value of said current and the effective value of said voltage to said measuring apparatus via said second communication means, and
• the control portion of said measuring apparatus calculates a power value based on the effective value of said current and the effective value of said voltage, which have been received from said load terminal via said first communication means, as well as on the voltage waveform acquired from said voltage sensor and the current waveform acquired from said current sensor.

A power measuring system comprising:

• a voltage sensor for detecting a voltage waveform of a power line in a noncontact manner through electrostatic coupling;
• a current sensor for detecting a current waveform of said power line in a noncontact manner through electromagnetic inductive coupling;
• a measuring apparatus including first communication means, a control portion connected to said voltage sensor and said current sensor, and an integrating portion for integrating power;
• and
• a load terminal connected to said power line and including a load of a predetermined value, second communication means for communicating with said first communication means, and a measuring portion for measuring an effective value of a current flowing through said load and calculating an effective value of a voltage based on the measured effective value of the current,
• wherein the measuring portion of said load terminal transmits the effective value of said current and the effective value of said voltage to said measuring apparatus via said second communication means, and
• the control portion of said measuring apparatus calculates a power value based on the effective value of said current and the effective value of said voltage, which have been received from said load terminal via said first communication means, as well as on the voltage waveform acquired from said voltage sensor and the current waveform acquired from said current sensor, and further integrates said power value in said integrating portion for a predetermined period.

A power measuring system comprising:

• a voltage sensor for detecting a voltage waveform of a power line in a noncontact manner through electrostatic coupling;
• a current sensor for detecting a current waveform of said power line in a noncontact manner through electromagnetic inductive coupling;
• a measuring apparatus including first communication means, a control portion connected to said voltage sensor and said current sensor, and an integrating portion for integrating power;
• and
• a load terminal connected to said power line and including a load of a predetermined value, second communication means for communicating with said first communication means, and a measuring portion for measuring an effective value of a current flowing through said load and an effective value of a voltage of said power line,
• wherein the measuring portion of said load terminal transmits the effective value of said current and the effective value of said voltage to said measuring apparatus via said second communication means, and
• the control portion of said measuring apparatus calculates a power value based on the effective value of said current and the effective value of said voltage, which have been received from said load terminal via said first communication means, as well as on the voltage waveform acquired from said voltage sensor and the current waveform acquired from said current sensor, and further integrates said power value in said integrating portion for a predetermined period.

A measuring apparatus comprising:

• a control portion connected to a voltage sensor for detecting a voltage waveform of a power line in a noncontact manner through electrostatic coupling and to a current sensor for detecting a current waveform of said power line in a noncontact manner through electromagnetic inductive coupling;
• and
• storage means for storing a correction coefficient provided as a predetermined value,
• wherein said control portion calculates a power value of said power line based on the voltage waveform detected by said voltage sensor, the current waveform detected by said current sensor, and the correction coefficient stored in said storage means.

A measuring apparatus comprising:

• a control portion connected to a voltage sensor for detecting a voltage waveform of a power line in a noncontact manner through electrostatic coupling and to a current sensor for detecting a current waveform of said power line in a noncontact manner through electromagnetic inductive coupling;
• and
• storage means,
• wherein, in an initial stage of installation, said control portion calculates a correction coefficient based on an effective value of a current and an effective value of a voltage, which are acquired from an external load terminal, as well as on the voltage waveform detected by said voltage sensor and the current waveform detected by said current sensor, and further stores the calculated correction coefficient in said storage means, and
• during power measurement, said control portion calculates a power value of said power line based on the voltage waveform detected by said voltage sensor, the current waveform detected by said current sensor, and the correction coefficient stored in said storage means.

A measuring apparatus comprising:

• a control portion connected to a voltage sensor for detecting a voltage waveform of a power line in a noncontact manner through electrostatic coupling and to a current sensor for detecting a current waveform of said power line in a noncontact manner through electromagnetic inductive coupling;
• storage means;
• and
• communication means,
• wherein, in an initial stage of installation, said control portion transmits a data request to an external load terminal via said communication means, receives an effective value of a current and an effective value of a voltage from said external load terminal via said communication means, calculates a correction coefficient based on the effective value of said current and the effective value of said voltage which have been received, as well as on the voltage waveform detected by said voltage sensor and the current waveform detected by said current sensor, and further stores the calculated correction coefficient in said storage means, and
• during power measurement, said control portion calculates a power value of said power line based on the voltage waveform detected by said voltage sensor, the current waveform detected by said current sensor, and the correction coefficient stored in said storage means.

A load terminal connected to a power line, comprising:

• a load of a predetermined value, contact means for opening and closing a line wired between said power line and said load, a measuring portion, communication means, and storage means,
• wherein upon receiving a first command from an external measuring apparatus via said communication means, the measuring portion closes said contact means, acquires an effective value of a current flowing through said load and an effective value of a voltage of said power line, and stores the acquired effective values in said storage means,
• upon receiving a second command from said external measuring apparatus via said communication means, said measuring portion opens said contact means, and
• upon receiving a third command from said external measuring apparatus via said communication means, said measuring portion transmits the effective value of the current and the effective value of the voltage, which are stored in said storage means, to said external measuring apparatus via said communication means.