GB749832A - Improvements in or relating to electrical control circuits - Google Patents

Improvements in or relating to electrical control circuits

Info

Publication number
GB749832A
GB749832A GB556953A GB556953A GB749832A GB 749832 A GB749832 A GB 749832A GB 556953 A GB556953 A GB 556953A GB 556953 A GB556953 A GB 556953A GB 749832 A GB749832 A GB 749832A
Authority
GB
United Kingdom
Prior art keywords
relay
voltage
flashover
precipitator
feb
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
GB556953A
Inventor
Thomas Philip Robinson
Bertram Walter Glover
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB556953A priority Critical patent/GB749832A/en
Publication of GB749832A publication Critical patent/GB749832A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/32—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using magnetic devices having a controllable degree of saturation as final control devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)

Abstract

749,832. Protective arrangements for supply systems for electrical precipitators. STANDARD TELEPHONES & CABLES, Ltd. Feb. 19, 1954 [Feb. 27, 1953], No. 5569/53. Class 38 (4). Simultaneous conditions of low voltage and high current, say, in a rectifier system TI, MR1 supplying a precipitator -indicative of flashover or arcing therein-cause opera- RE1 tion of current relay - and 2 RE2 voltage relay -, with conse- 1 RE3 quent operation of relay '-- 4 which, by its contacts RE3.3, RE3.4, effects a further voltage reduction to an arc extinction value by de-energizing the D.C. excitation windings of saturable reactors LS1-LS6 in series with the primary windings of the mains transformer T1 and simultaneously energizing the excitation windings of further saturable reactors LP1-LP6 which shunt the primary windings of the transformer. The voltage relay is controlled by a normally non-conducting cold-cathode valve CC which, however, conducts upon flashover in the precipitator, due to consequent reduction of hold-off voltage across bias potentiometer R2. Contact RE3.1 closes RE3 a holding circuit for relay - and establishes 4 a supply to a timing circuit C1R3, independent of contacts RE1.1, RE2.1, which are both open when the flashover is cleared. The timing circuit eventually operates a further relay RE 4 /3 which de-energizes RE 3 /4 and so effects a return to normal supply conditions. Specification 684,024, [Group XL (a )], is referred to.
GB556953A 1953-02-27 1953-02-27 Improvements in or relating to electrical control circuits Expired GB749832A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB556953A GB749832A (en) 1953-02-27 1953-02-27 Improvements in or relating to electrical control circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB556953A GB749832A (en) 1953-02-27 1953-02-27 Improvements in or relating to electrical control circuits

Publications (1)

Publication Number Publication Date
GB749832A true GB749832A (en) 1956-06-06

Family

ID=9798585

Family Applications (1)

Application Number Title Priority Date Filing Date
GB556953A Expired GB749832A (en) 1953-02-27 1953-02-27 Improvements in or relating to electrical control circuits

Country Status (1)

Country Link
GB (1) GB749832A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3271931A (en) * 1965-01-29 1966-09-13 Detroit Edison Co Automatic control for fly ash precipitators

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3271931A (en) * 1965-01-29 1966-09-13 Detroit Edison Co Automatic control for fly ash precipitators

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