GB838298A - Improvements in or relating to electric protective relay devices - Google Patents

Improvements in or relating to electric protective relay devices

Info

Publication number
GB838298A
GB838298A GB19252/56A GB1925256A GB838298A GB 838298 A GB838298 A GB 838298A GB 19252/56 A GB19252/56 A GB 19252/56A GB 1925256 A GB1925256 A GB 1925256A GB 838298 A GB838298 A GB 838298A
Authority
GB
United Kingdom
Prior art keywords
relay
resistor
heater
circuit
relating
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
GB19252/56A
Inventor
George Francis Chrisp
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.)
A Reyrolle and Co Ltd
Original Assignee
A Reyrolle and 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 A Reyrolle and Co Ltd filed Critical A Reyrolle and Co Ltd
Priority to GB19252/56A priority Critical patent/GB838298A/en
Publication of GB838298A publication Critical patent/GB838298A/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
    • H02H3/08—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 excess current
    • H02H3/085—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 excess current making use of a thermal sensor, e.g. thermistor, heated by the excess current

Landscapes

  • Control Of Resistance Heating (AREA)

Abstract

838,298. Protective cut-out arrangements. REYROLLE & CO. Ltd., A. June 21, 1956, No. 19252/56. Class 38 (5). A protective device comprises a heater element A energized from the protected circuit and acting to generate heat in accordance with the current flow in such circuit, and a relay network with a relay C in a sealed case and in series with a temperature-sensitive resistor B exposed to the heat generated by the heater A. The resistor and relay may be supplied from a separate source or (as shown) connected in parallel with the heater so that under short-circuit conditions the relay C will operate without waiting for the effect of the heat generated. The resistor B has a negative temperature coefficient and a further resistor F having a similar coefficient may be connected across the relay C to provide ambient temperature compensation. A variable resistor E is provided for current setting. A resistor B having a positive temperature coefficient may be used, connected in parallel with the relay coil.
GB19252/56A 1956-06-21 1956-06-21 Improvements in or relating to electric protective relay devices Expired GB838298A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB19252/56A GB838298A (en) 1956-06-21 1956-06-21 Improvements in or relating to electric protective relay devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19252/56A GB838298A (en) 1956-06-21 1956-06-21 Improvements in or relating to electric protective relay devices

Publications (1)

Publication Number Publication Date
GB838298A true GB838298A (en) 1960-06-22

Family

ID=10126270

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19252/56A Expired GB838298A (en) 1956-06-21 1956-06-21 Improvements in or relating to electric protective relay devices

Country Status (1)

Country Link
GB (1) GB838298A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352987A2 (en) * 1988-07-26 1990-01-31 Texas Instruments Incorporated Solid state circuit protector
EP0375262A2 (en) * 1988-12-22 1990-06-27 Texas Instruments Incorporated Electrothermal sensor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352987A2 (en) * 1988-07-26 1990-01-31 Texas Instruments Incorporated Solid state circuit protector
EP0352987A3 (en) * 1988-07-26 1991-07-10 Texas Instruments Incorporated Solid state circuit protector
EP0375262A2 (en) * 1988-12-22 1990-06-27 Texas Instruments Incorporated Electrothermal sensor
EP0375262A3 (en) * 1988-12-22 1991-07-17 Texas Instruments Incorporated Electrothermal sensor

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