GB1373581A - Wattmeters - Google Patents

Wattmeters

Info

Publication number
GB1373581A
GB1373581A GB60172A GB60172A GB1373581A GB 1373581 A GB1373581 A GB 1373581A GB 60172 A GB60172 A GB 60172A GB 60172 A GB60172 A GB 60172A GB 1373581 A GB1373581 A GB 1373581A
Authority
GB
United Kingdom
Prior art keywords
voltage
converters
jan
shift register
wattmeter
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.)
Expired
Application number
GB60172A
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.)
Hunter R D
Original Assignee
Hunter R D
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 Hunter R D filed Critical Hunter R D
Priority to GB60172A priority Critical patent/GB1373581A/en
Publication of GB1373581A publication Critical patent/GB1373581A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique

Abstract

1373581 Digital wattmeter RD HUNTER 5 Jan 1973 [6 Jan 1972] 601/72 Heading G1U In a wattmeter, voltage and current waveforms proportional to voltage across and current through an inductive load Z are sampled and converted to digital signals which are multiplied at 16 and accumulated at 20 and the average read out in decimal form after a given number of samples. As shown respective A-D converters are provided and the voltage signals are delayed #/2 in a shift register 40. Clock pulses for the converters and shift register are at a phase-locked multiple of the frequency of source V. The circuit may use only one A-D converter shared between the voltage and current waveforms and may be adapted for polyphase inputs.
GB60172A 1973-01-05 1973-01-05 Wattmeters Expired GB1373581A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB60172A GB1373581A (en) 1973-01-05 1973-01-05 Wattmeters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB60172A GB1373581A (en) 1973-01-05 1973-01-05 Wattmeters

Publications (1)

Publication Number Publication Date
GB1373581A true GB1373581A (en) 1974-11-13

Family

ID=9707255

Family Applications (1)

Application Number Title Priority Date Filing Date
GB60172A Expired GB1373581A (en) 1973-01-05 1973-01-05 Wattmeters

Country Status (1)

Country Link
GB (1) GB1373581A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011094A2 (en) * 1978-11-13 1980-05-28 LGZ LANDIS & GYR ZUG AG Device for measuring electric energy
EP0014038A1 (en) * 1979-01-11 1980-08-06 South Eastern Electricity Board Kilowatt-hour meters
US4250449A (en) * 1978-11-24 1981-02-10 Westinghouse Electric Corp. Digital electric energy measuring circuit
GB2117913A (en) * 1982-03-25 1983-10-19 Gen Electric Canada Vector KVA meter
FR2551877A1 (en) * 1983-09-13 1985-03-15 Enertec Electric power meter, particularly for a very high voltage
GB2178177A (en) * 1983-08-01 1987-02-04 Robinton Prod Inc A system for multiplying signals together
US4709375A (en) * 1983-09-27 1987-11-24 Robinton Products, Inc. Digital phase selection system for signal multipliers

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011094A2 (en) * 1978-11-13 1980-05-28 LGZ LANDIS & GYR ZUG AG Device for measuring electric energy
EP0011094A3 (en) * 1978-11-13 1980-06-25 Lgz Landis & Gyr Zug Ag Device for measuring electric energy
US4250449A (en) * 1978-11-24 1981-02-10 Westinghouse Electric Corp. Digital electric energy measuring circuit
EP0014038A1 (en) * 1979-01-11 1980-08-06 South Eastern Electricity Board Kilowatt-hour meters
GB2117913A (en) * 1982-03-25 1983-10-19 Gen Electric Canada Vector KVA meter
GB2178177A (en) * 1983-08-01 1987-02-04 Robinton Prod Inc A system for multiplying signals together
FR2551877A1 (en) * 1983-09-13 1985-03-15 Enertec Electric power meter, particularly for a very high voltage
US4709375A (en) * 1983-09-27 1987-11-24 Robinton Products, Inc. Digital phase selection system for signal multipliers

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees