JPS5554458A - Electric current measuring instrument - Google Patents

Electric current measuring instrument

Info

Publication number
JPS5554458A
JPS5554458A JP11048978A JP11048978A JPS5554458A JP S5554458 A JPS5554458 A JP S5554458A JP 11048978 A JP11048978 A JP 11048978A JP 11048978 A JP11048978 A JP 11048978A JP S5554458 A JPS5554458 A JP S5554458A
Authority
JP
Japan
Prior art keywords
current
frequency
circuit
time
phase
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
JP11048978A
Other languages
Japanese (ja)
Inventor
Masayoshi Hoshina
Atsushi Ito
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.)
Nippon Signal Co Ltd
Original Assignee
Nippon Signal 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 Nippon Signal Co Ltd filed Critical Nippon Signal Co Ltd
Priority to JP11048978A priority Critical patent/JPS5554458A/en
Publication of JPS5554458A publication Critical patent/JPS5554458A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

PURPOSE: To incorporate many pieces of current onformation in the same frequency by obtaining a surge signal, coded synchronizing with a frequency of a transmission current, by detecting periodic variation in transmission current.
CONSTITUTION: Since currents flowing through transmission line R (or S or T) vary regularly securing a phase difference of 120°, synchronous detecting method 16 of transmitter 4 detects when they cross the time axis with positive gradients, and series coding circuit 11 is driven by detection signals of it. Circuit 11 sends out series-coded signals in sequence to modulation circuit 12 within the time determined by the number of bits of data information and a carrier frequency to transmit data in a radio wave through high-frequency amplifier circuit 14 and antenna 15. Here, the maximum width of the time should be less than the time width equivalent to a phase difference of each phase or approximately 3m sec. As a result, several pieces of current information can be incorporated in the same frequency and information of each phase can be discriminated by one receiver.
COPYRIGHT: (C)1980,JPO&Japio
JP11048978A 1978-09-08 1978-09-08 Electric current measuring instrument Pending JPS5554458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11048978A JPS5554458A (en) 1978-09-08 1978-09-08 Electric current measuring instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11048978A JPS5554458A (en) 1978-09-08 1978-09-08 Electric current measuring instrument

Publications (1)

Publication Number Publication Date
JPS5554458A true JPS5554458A (en) 1980-04-21

Family

ID=14537029

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11048978A Pending JPS5554458A (en) 1978-09-08 1978-09-08 Electric current measuring instrument

Country Status (1)

Country Link
JP (1) JPS5554458A (en)

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