Power theft inspection apparatus and method, and recording medium
A power theft inspection apparatus is provided with: a controlling device configured to open a third switch unit between a power reception unit and a power reception control circuit of a power receiving apparatus at the start of a power theft inspection, then open a first switch unit between a power transmission unit and a power supply unit of a power transmitting apparatus after the opening of the third switch unit, and then close a second switch unit configured to short-circuit the power transmission unit of the power transmitting apparatus after the opening of the first switch unit; and a determining device configured to determine whether or not there is power theft according to a current detected by a first current detecting device configured to detect a current in the power transmission unit of the power transmitting apparatus upon the power theft inspection.
1. A power theft inspection apparatus configured to detect presence or absence of power theft for a power transmitting apparatus provided with a power transmission unit having two terminals, a power supply unit configured to supply alternating current (AC) power to the power transmission unit, a first switch unit disposed between one of the two terminals and the power supply unit, a second switch unit which allows a short-circuit between the two terminals, and a first current detecting device configured to detect a current flowing through the power transmission unit, said power theft inspection apparatus comprising:
a controlling device configured to control the first switch unit such that the first switch unit is opened and then control the second switch unit such that the second switch unit is closed; and
a determining device configured to determine whether or not there is the power theft according to the current detected by the first current detecting device,
wherein said controlling device controls a third switch, which is disposed between a power reception control circuit and a power reception unit of a power receiving apparatus configured to receive electric power transmitted from the power transmitting apparatus, such that the third switch unit is opened, before controlling the first switch unit such that the first switch unit is opened.
2. The power theft inspection apparatus according to claim 1 , wherein
the power receiving apparatus further comprises a second current detecting device configured to detect a current flowing between the power reception unit and the power reception control circuit, and
said controlling device
controls the third switch unit such that the third switch unit is opened at a timing at which the current detected by the second current detecting device can be considered to be zero, or
controls the first switch unit such that the first switch unit is opened at a timing at which the current detected by the first current detecting device can be considered to be zero.
3. The power theft inspection apparatus according to claim 1 , wherein said controlling device controls the first switch unit such that the first switch unit is opened at a timing at which the current detected by the first current detecting device can be considered to be zero.
4. The power theft inspection apparatus according to claim 1 , wherein said controlling device controls the second switch unit such that the second switch unit is opened at an end of a power theft inspection, then controls the third switch unit such that the third switch unit is closed, and then controls the first switch such that the first switch unit is closed.
5. The power theft inspection apparatus according to claim 1 , wherein said determining device determines whether or not there is the power theft on the basis of a time constant of decay associated with the current detected by the first current detecting device in a predetermined period after the closing of the second switch unit.
6. The power theft inspection apparatus according to claim 1 , wherein said controlling device controls the power supply unit to reduce the AC power supplied to the power transmission unit before controlling the first switch unit such that the first switch unit is opened.
7. The power theft inspection apparatus according to claim 2 , wherein
the power receiving apparatus comprises a switch controlling circuit configured to control the third switch unit by inputting a signal indicating current detected by the second current detecting device and a switch-open instruction signal created by the controlling device, and
said controlling device controls the third switch unit through the switch controlling circuit.
8. A power theft inspection method performed by a power theft inspection apparatus configured to detect presence or absence of power theft for a power transmitting apparatus that has a power transmission unit having two terminals, a power supply unit configured to supply alternating current (AC) power to the power transmission unit, a first switch unit disposed between one of the two terminals and the power supply unit, a second switch unit which allows a short-circuit between the two terminals, and a first current detecting device configured to detect a current flowing through the power transmission unit, said power theft inspection method comprising:
a first process of controlling a third switch, which is disposed between a power reception control circuit and a power reception unit of a power receiving apparatus configured to receive electric power transmitted from the power transmitting apparatus, such that the third switch unit is opened upon a power theft inspection;
a second process of controlling the first switch unit such that the first switch unit is opened after the first process;
a third process of controlling the second switch unit such that the second switch unit is closed after the second process; and
a fourth process of determining whether or not there is the power theft according to the current detected by the first current detecting device after the third process.
9. A non-transitory tangible recording medium configured to store therein a computer program that, upon execution by a computer mounted on a power theft inspection apparatus, causes the power theft inspection apparatus to function as a controlling device and a determining device, said power theft inspection apparatus being configured to detect a presence or absence of power theft for a power transmitting apparatus that has a power transmission unit having two terminals, a power supply unit configured to supply alternating current (AC) power to the power transmission unit, a first switch unit disposed between one of the two terminals and the power supply unit, a second switch unit which allows a short-circuit between the two terminals, and a first current detecting device configured to detect a current flowing through the power transmission unit, said power theft inspection apparatus comprising:
the controlling device configured to control the first switch unit such that the first switch unit is opened and then control the second switch unit such that the second switch unit is closed; and
the determining device configured to determine whether or not there is the power theft according to the current detected by the first current detecting device,
wherein said controlling device controls a third switch, which is disposed between a power reception control circuit and a power reception unit of a power receiving apparatus configured to receive electric power transmitted from the power transmitting apparatus, such that the third switch unit is opened, before controlling the first switch unit such that the first switch unit is opened.