Kabushiki Kaisha Toshiba

Toshiba Mitsubishi-electric Industrial Systems Corporation

Sony Corporation

Toshiba Industrial Products and Systems Corporation

Takayuki Sakurai

Tetsuo Yoshimitsu

Satoshi Hiroshima

Tatsuya Hirose

Hiroyuki Ogawa

Yuji Yamamoto

Tomomi Ikegami

Masayuki Hikita

Masahiro Kozako

Takahisa Ueno

Makiko Hara

A partial discharge measurement device includes: an impulse voltage application unit; a measurement control unit; and first and second partial discharge detection unit. The measurement control unit includes: a first and a second detector level partial discharge counting unit; and a partial discharge resistance evaluation unit. Each of the first and the second detector level partial discharge counting units outputs a first or second detection signal when the first or second detection signal exceeds a predetermined specified value. The partial discharge resistance evaluation unit counts the number of occurrences of partial discharge based on an output from the first and second detector level partial discharge counting unit, and regards the impulse voltage value at which the count value has reached a predetermined value as a partial discharge inception voltage under the repeated impulse voltage application.

Partial discharge measurement device

An object is to restrict the giving of points according to an object of payment for which payment was made with electronic money. An electronic money server (FIG.) receives transaction information in which a breakdown of the amount of payment of an electronic money card used in one payment processing is recorded and breakdown information in which a breakdown of the amount of payment for each object of payment in this payment processing is recorded. The breakdown includes a normal item into which general products are classified, a tax-free item into which tax-free articles such as a postage stamp are classified, and a collected item into which public utility rates collected by an agency payment service are classified. Among these breakdown items, points are given to the amount of payment made for a normal item, and no points are given to the others. The electronic money serveridentifies the amount of payment used for paying for a normal item product in the amount of payment made with the electronic money card by checking the breakdown information against the transaction information, and calculates the number of points for the amount of payment.

Point calculating device and method for calculating points

An impulse voltage generator uses a predetermined rectangular waveform signal and a high voltage to generate an impulse voltage. The high voltage is obtained by boosting an instruction voltage of the rectangular waveform signal on a per-cycle basis. A partial discharge frequency calculation section receives detection signals based on partial discharges occurring in an object to be measured by the application of the impulse voltage and counts the detection signal on a per-cycle basis as a partial discharge frequency. An application voltage signal observation circuit observes an application voltage signal indicating the impulse voltage applied to the object to be measured. In a first cycle in which the partial discharge frequency reaches a specified frequency or more, a voltage value acquiring section sets, as a partial discharge starting voltage, the peak value of the voltage indicated by the application voltage signal output from the application voltage signal observation circuit.

Partial discharge measurement system and partial discharge measurement method by repeated impulse voltage

A signal generator generates a combined signal that is generated only in the period where supply of a pulse signal is effected, a pulse signal whose frequency is of a higher impulse repetition frequency than the frequency of the period setting signal and whose amplitude represents a voltage value that is lower than the high voltage HVDC value. A semiconductor switch accumulates electric charge on a capacitative element by means of the high voltage HVDC from the high voltage generator when the voltage value of the combined signal is lower than the set gate voltage value and generates an impulse voltage whose peak value is the value of the high voltage HVDC, by means of the electric charge that is discharged from the capacitative element when the voltage value of the combined signal exceeds the set gate voltage value.

Impulse voltage generation device

Growing community of inventors

Tokyo, Japan

Takayuki Sakurai