GB1530479A - Methods and apparatus for sensing flashovers in electrical apparatus - Google Patents

Methods and apparatus for sensing flashovers in electrical apparatus

Info

Publication number
GB1530479A
GB1530479A GB5188375A GB5188375A GB1530479A GB 1530479 A GB1530479 A GB 1530479A GB 5188375 A GB5188375 A GB 5188375A GB 5188375 A GB5188375 A GB 5188375A GB 1530479 A GB1530479 A GB 1530479A
Authority
GB
United Kingdom
Prior art keywords
current
cycle
cycles
flashover
sensing
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
GB5188375A
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.)
Siemens Mobility Ltd
Original Assignee
Westinghouse Brake and 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 Westinghouse Brake and Signal Co Ltd filed Critical Westinghouse Brake and Signal Co Ltd
Priority to GB5188375A priority Critical patent/GB1530479A/en
Priority to AU20074/76A priority patent/AU2007476A/en
Publication of GB1530479A publication Critical patent/GB1530479A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/44—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the rate of change of electrical quantities
    • 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
    • B03C3/68—Control systems therefor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H02H1/0015—Using arc detectors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/003—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electrostatic apparatus

Abstract

1530479 Control systems for electro-static precipitators WESTINGHOUSE BRAKE & SIGNAL CO Ltd 3 Dec 1976 [18 Dec 1975] 51883/75 Heading H2H A method of sensing a flashover in electrical apparatus 10 such as an electrostatic precipitator comprises sensing the current passed by a control circuit 16 in selected half cycles of an A.C. supply, comparing the current in a selected half-cycle with the current in a chosen preceding half-cycle or with a weighted average of currents in chosen preceding half-cycles whereby a flashover is sensed if the comparison indicates that the current in the latest half-cycle is greater than the current in the chosen preceding half-cycle or the weighted average of currents in chosen preceding half-cycles. An A.C. supply 14 is connected to the precipitator via a transformer/rectifier unit 12 and the control circuit 16 which includes a pair of inverse-parallel connected thyristors. The current supplied to the precipitator is sensed by a transformer or Hall-effect device 18 and fed to a monitor 20. A current comparator 24 compares the output of the monitor 20 with the output of a weighting and average circuit 26 connected to a store 22. If a flashover occurs, the resultant increased current in the following half-cycle is detected by the comparator which retards the firing point or switches off the thyristors in the circuit 16 and operates an alarm and/or indicator 40.
GB5188375A 1975-12-18 1975-12-18 Methods and apparatus for sensing flashovers in electrical apparatus Expired GB1530479A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB5188375A GB1530479A (en) 1975-12-18 1975-12-18 Methods and apparatus for sensing flashovers in electrical apparatus
AU20074/76A AU2007476A (en) 1975-12-18 1976-11-29 Sensing flashover in a.c. -fed apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5188375A GB1530479A (en) 1975-12-18 1975-12-18 Methods and apparatus for sensing flashovers in electrical apparatus

Publications (1)

Publication Number Publication Date
GB1530479A true GB1530479A (en) 1978-11-01

Family

ID=10461780

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5188375A Expired GB1530479A (en) 1975-12-18 1975-12-18 Methods and apparatus for sensing flashovers in electrical apparatus

Country Status (2)

Country Link
AU (1) AU2007476A (en)
GB (1) GB1530479A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2587919A1 (en) * 1985-10-02 1987-04-03 Sames Sa ELECTROSTATIC PROJECTION APPARATUS PROTECTED AGAINST THE APPEARANCE OF ELECTRIC ARCS
CN103611631A (en) * 2013-11-18 2014-03-05 江苏科技大学 High-frequency high-voltage electrostatic dust removal power control system and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2587919A1 (en) * 1985-10-02 1987-04-03 Sames Sa ELECTROSTATIC PROJECTION APPARATUS PROTECTED AGAINST THE APPEARANCE OF ELECTRIC ARCS
EP0219409A1 (en) * 1985-10-02 1987-04-22 Sames S.A. Electrostatic spraying device protected against the occurrence of electric arcs
US4737887A (en) * 1985-10-02 1988-04-12 Sames S.A. Electrostatic spray device provided with electric-arc protection means
CN103611631A (en) * 2013-11-18 2014-03-05 江苏科技大学 High-frequency high-voltage electrostatic dust removal power control system and method
CN103611631B (en) * 2013-11-18 2016-03-30 江苏科技大学 High-frequency high-voltage electrostatic dust removal power control system and method

Also Published As

Publication number Publication date
AU2007476A (en) 1978-06-08

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed