GB566582A - Improvements relating to electrical excess voltage protective devices - Google Patents

Improvements relating to electrical excess voltage protective devices

Info

Publication number
GB566582A
GB566582A GB849743A GB849743A GB566582A GB 566582 A GB566582 A GB 566582A GB 849743 A GB849743 A GB 849743A GB 849743 A GB849743 A GB 849743A GB 566582 A GB566582 A GB 566582A
Authority
GB
United Kingdom
Prior art keywords
neon
per cent
argon
electrodes
voltage protective
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
GB849743A
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.)
RALPH ALAN WILKINSON
Siemens Electric Lamps and Supplies Ltd
Original Assignee
RALPH ALAN WILKINSON
Siemens Electric Lamps and Supplies 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 RALPH ALAN WILKINSON, Siemens Electric Lamps and Supplies Ltd filed Critical RALPH ALAN WILKINSON
Priority to GB849743A priority Critical patent/GB566582A/en
Publication of GB566582A publication Critical patent/GB566582A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/20—Means for starting arc or facilitating ignition of spark gap
    • H01T1/22—Means for starting arc or facilitating ignition of spark gap by the shape or the composition of the electrodes

Landscapes

  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)

Abstract

566,582. Discharge apparatus. SIEMENS ELECTRIC LAMPS & SUPPLIES, Ltd., TREECE, H. R.; and WILKINSON, R. A. May 27, 1943, No. 8497. [Class 39 (i)] An excess-voltage protective device consists of two dome-shaped electrodes 7 of iron, steel, nickel or nickel-steel, in which are inserted studs 8 of more easily volatilizable metal, such as aluminium or silver. The melting point of the stud metal must be over 400‹ C. and the boiling point between 1200‹ C. and 2000‹ C. A thin coating of radio-active uranium oxide on the surface of the electrodes ensures adequate ionization. The electrodes when assembled are baked in hydrogen or cracked ammonia at 600-700‹ C. for 10-15 minutes. The envelope 1 is baked at 400‹ C. for 10 minutes and filled with neon or neon and argon ; at 2 mms. spacing a mixture of 99 per cent neon and 1 per cent argon at 30-100 mms. will break down at 150 volts, or 80 per cent neon and 20 per cent argon at 400 volts at the same pressure.
GB849743A 1943-05-27 1943-05-27 Improvements relating to electrical excess voltage protective devices Expired GB566582A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB849743A GB566582A (en) 1943-05-27 1943-05-27 Improvements relating to electrical excess voltage protective devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB849743A GB566582A (en) 1943-05-27 1943-05-27 Improvements relating to electrical excess voltage protective devices

Publications (1)

Publication Number Publication Date
GB566582A true GB566582A (en) 1945-01-04

Family

ID=9853589

Family Applications (1)

Application Number Title Priority Date Filing Date
GB849743A Expired GB566582A (en) 1943-05-27 1943-05-27 Improvements relating to electrical excess voltage protective devices

Country Status (1)

Country Link
GB (1) GB566582A (en)

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