GB971220A - Improvements relating to electric circuit-breaker systems - Google Patents

Improvements relating to electric circuit-breaker systems

Info

Publication number
GB971220A
GB971220A GB682962A GB682962A GB971220A GB 971220 A GB971220 A GB 971220A GB 682962 A GB682962 A GB 682962A GB 682962 A GB682962 A GB 682962A GB 971220 A GB971220 A GB 971220A
Authority
GB
United Kingdom
Prior art keywords
valve
isolator
resistor
piston
pressure air
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
GB682962A
Inventor
Thomas Webster Wilcox
Donald Foster Amer
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.)
Merz and Mclellan Services Ltd
Original Assignee
Merz and Mclellan Services 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 Merz and Mclellan Services Ltd filed Critical Merz and Mclellan Services Ltd
Priority to GB682962A priority Critical patent/GB971220A/en
Priority to FR912964A priority patent/FR1336622A/en
Publication of GB971220A publication Critical patent/GB971220A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic

Landscapes

  • Breakers (AREA)

Abstract

971,220. Gas blast switches. MERZ & McLELLAN SERVICES Ltd. Oct. 22, 1962 [Feb. 21, 1962], No. 6829/62. Heading H2B. A circuit-breaker system includes a main switch, consisting of a gas blast circuit - breaker 10 with series isolator 21 for making and breaking an inductive load circuit, and a resistor switch 25 operating automatically to connect a resistor 27 across the load immediately before the main switch opens and to disconnect it immediately after the main switch is closed. Electromagnetic release of a latch 44 operates a valve 40 to vent the underside of a piston 37 to atmosphere, whereupon the pressure air in a reservoir 35 drives the piston 37 downwards to open a blast valve 36, normally spring closed. Pressure air enters the circuit-breaker chamber separating the contacts and extinguishing the arc formed between them. As the valve 36 opens pressure air passes along line 85 to a valve 76 driving its spool to left to allow air from line 81 to drive a piston 68 upwards to close resistor switch contacts 28, 29. Pressure air also passes along a line 49 to a valve 50 and after a short period is sufficient to drive the mechanism 53, 56 over-centre to open the isolator 20. Rotation of the isolator shaft 54 causes a cam 65 to reset the latch 44, reapplying pressure to the underside of the piston 37 to close the blast valve and thus the circuitbreaker contacts. The isolator and resistor switch then remain in the open and closed positions respectively until a second latch 62 is electromagnetically tripped to allow a valve 39 to apply pressure air to the other side of valve 50 to reclose the isolator, a second cam 64 on the isolator shaft resetting the latch 62. Air is also applied to the other side of valve 76 driving its spool to the right to vent the underside of piston 68 through a restricted aperture 80. This restriction together with the overclosure allowed by spring mounting contact 28 ensures that the isolator 20 closes before the resistor switch opens. In a modification (Fig. 3, not shown), the resistor switch comprises a pivoted flexible blade arranged on the live side of the resistor.
GB682962A 1962-02-21 1962-02-21 Improvements relating to electric circuit-breaker systems Expired GB971220A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB682962A GB971220A (en) 1962-02-21 1962-02-21 Improvements relating to electric circuit-breaker systems
FR912964A FR1336622A (en) 1962-02-21 1962-10-22 Improvements to circuit breakers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB682962A GB971220A (en) 1962-02-21 1962-02-21 Improvements relating to electric circuit-breaker systems

Publications (1)

Publication Number Publication Date
GB971220A true GB971220A (en) 1964-09-30

Family

ID=9821518

Family Applications (1)

Application Number Title Priority Date Filing Date
GB682962A Expired GB971220A (en) 1962-02-21 1962-02-21 Improvements relating to electric circuit-breaker systems

Country Status (1)

Country Link
GB (1) GB971220A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217916A (en) * 1988-04-19 1989-11-01 Mitsubishi Electric Corp Electric switch assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217916A (en) * 1988-04-19 1989-11-01 Mitsubishi Electric Corp Electric switch assembly
GB2217916B (en) * 1988-04-19 1992-04-01 Mitsubishi Electric Corp Electric switch apparatus

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