GB1357178A - Circuits for electronic ac wattmeters - Google Patents

Circuits for electronic ac wattmeters

Info

Publication number
GB1357178A
GB1357178A GB5337871A GB5337871A GB1357178A GB 1357178 A GB1357178 A GB 1357178A GB 5337871 A GB5337871 A GB 5337871A GB 5337871 A GB5337871 A GB 5337871A GB 1357178 A GB1357178 A GB 1357178A
Authority
GB
United Kingdom
Prior art keywords
voltage
resistor
supply voltage
load
load current
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
GB5337871A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB5337871A priority Critical patent/GB1357178A/en
Priority to ZA728078A priority patent/ZA728078B/en
Priority to DE2255815A priority patent/DE2255815A1/en
Publication of GB1357178A publication Critical patent/GB1357178A/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
    • G01R21/10—Arrangements for measuring electric power or power factor by using square-law characteristics of circuit elements, e.g. diodes, to measure power absorbed by loads of known impedance

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rectifiers (AREA)

Abstract

1357178 Watt meter GENERAL ELECTRIC CO Ltd 15 Nov 1972 [17 Nov 1971] 53378/71 Heading G1U A watt meter using the "quarter squares" principle applies, in alternate half-cycles of the supply voltage V1, V2, firstly (when V1 is positive) the sum of the supply voltage VI, V2 and a voltage proportional to a load current I1, I2 developed across a resistor R4 and secondly the difference between the supply voltage V1, V2 and a voltage proportional to the load current I1, 12 developed across an equal resistor R3, to a full-wave rectifier FW having a square-law current load ladder on its D. C. side, and the average current flowing on the A. C. side of the rectifier is indicated on a meter M, damped by capacitors C3, C4. Selection of resistor R3 or R4 is effected by diodes D6, D7 respectively. The circuit includes various protective arrangements including (a) two Zener-diode/resistor combinations D4, R5 and D5, R6 which, when the circuit is operating within its normal range operate singly, in alternate half-cycles of the supply voltage, each combination effectively adding to the main square-law load ladder, but which, when the load current becomes excessive both break down to limit the voltage across the divider R3, R4, (b) Zener-diodes D1 and D2 which protect the D. C. blocking capacitor C1, and (c) a voltage dependent resistor VDR which shorts out voltage spikes.
GB5337871A 1971-11-17 1971-11-17 Circuits for electronic ac wattmeters Expired GB1357178A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB5337871A GB1357178A (en) 1971-11-17 1971-11-17 Circuits for electronic ac wattmeters
ZA728078A ZA728078B (en) 1971-11-17 1972-11-14 Improvements in or relating to circuits for electronic a.c.wattmeters
DE2255815A DE2255815A1 (en) 1971-11-17 1972-11-15 CIRCUIT FOR AN ELECTRONIC AC POWER METER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5337871A GB1357178A (en) 1971-11-17 1971-11-17 Circuits for electronic ac wattmeters

Publications (1)

Publication Number Publication Date
GB1357178A true GB1357178A (en) 1974-06-19

Family

ID=10467595

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5337871A Expired GB1357178A (en) 1971-11-17 1971-11-17 Circuits for electronic ac wattmeters

Country Status (3)

Country Link
DE (1) DE2255815A1 (en)
GB (1) GB1357178A (en)
ZA (1) ZA728078B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2907238C2 (en) * 1979-02-23 1984-04-05 Spinner-GmbH Elektrotechnische Fabrik, 8000 München Tunable high frequency detector probe
DE3506195A1 (en) * 1985-02-22 1986-08-28 René 5100 Aachen Baltus Measuring circuit for detecting the power of a load

Also Published As

Publication number Publication date
DE2255815A1 (en) 1973-05-24
ZA728078B (en) 1973-07-25

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee