JPS6459166A - Reactive power measuring apparatus - Google Patents

Reactive power measuring apparatus

Info

Publication number
JPS6459166A
JPS6459166A JP21679787A JP21679787A JPS6459166A JP S6459166 A JPS6459166 A JP S6459166A JP 21679787 A JP21679787 A JP 21679787A JP 21679787 A JP21679787 A JP 21679787A JP S6459166 A JPS6459166 A JP S6459166A
Authority
JP
Japan
Prior art keywords
signal
pulse
circuit
phase
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP21679787A
Other languages
Japanese (ja)
Inventor
Fumio Shirai
Kazumi Miyake
Mitsuru Suehiro
Kenji Miyazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shikoku Instrumentation Co Ltd
Original Assignee
Shikoku Instrumentation Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shikoku Instrumentation Co Ltd filed Critical Shikoku Instrumentation Co Ltd
Priority to JP21679787A priority Critical patent/JPS6459166A/en
Publication of JPS6459166A publication Critical patent/JPS6459166A/en
Pending legal-status Critical Current

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  • Measuring Phase Differences (AREA)

Abstract

PURPOSE:To make it possible to set a phase-shifting angle as desired by the apparatus low in manufacturing cost, compact in size and high in accuracy, by pulse-modulating a voltage signal, latching the signal based on a control pulse which is obtained by successively multiplying the frequency, and multiplying the output signal which is phase-shifted predetermined angles with a current signal. CONSTITUTION:A voltage signal A is modulated in pulse-width by a voltage pulse-width modulation circuit 12 to be a pulse signal B which is then latched by a latch circuit 14 based on a control signal S having the frequency f as much as M times the signal S from a successive multiplication circuit 13. The control signal S is counted up until f/4 by a counter 16. An output of the circuit 14 is written in a RAM 17, with the above-counted value being an address. When the counter 16 is reset and returned to be 1, the signal is outputted from the RAM 17 to a latch circuit 18, thereby updating the content of the RAM 17. Accordingly, a pulse B' having its phase shifted by pi/2 with respect to the pulse B is generated in the circuit 18. The pulse signal B' is then multiplied with a current signal C via a multiplication circuit 19 to a voltage frequency conversion circuit 20 from which a pulse proportional to a reactive power is outputted to a counter 21. As described above, pi/2 or any desired phase-shifting angles can be set with high accuracy.
JP21679787A 1987-08-31 1987-08-31 Reactive power measuring apparatus Pending JPS6459166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21679787A JPS6459166A (en) 1987-08-31 1987-08-31 Reactive power measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21679787A JPS6459166A (en) 1987-08-31 1987-08-31 Reactive power measuring apparatus

Publications (1)

Publication Number Publication Date
JPS6459166A true JPS6459166A (en) 1989-03-06

Family

ID=16694029

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21679787A Pending JPS6459166A (en) 1987-08-31 1987-08-31 Reactive power measuring apparatus

Country Status (1)

Country Link
JP (1) JPS6459166A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56112656A (en) * 1980-02-12 1981-09-05 Toko Seiki Kk Electronic reactive power meter
JPS6287872A (en) * 1985-10-02 1987-04-22 ウエスチングハウス　エレクトリック　コ−ポレ−ション Measuring device for power

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56112656A (en) * 1980-02-12 1981-09-05 Toko Seiki Kk Electronic reactive power meter
JPS6287872A (en) * 1985-10-02 1987-04-22 ウエスチングハウス　エレクトリック　コ−ポレ−ション Measuring device for power

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