GB958775A - Improvements in and relating to electrical relay circuit arrangements - Google Patents

Improvements in and relating to electrical relay circuit arrangements

Info

Publication number
GB958775A
GB958775A GB20036/59A GB2003659A GB958775A GB 958775 A GB958775 A GB 958775A GB 20036/59 A GB20036/59 A GB 20036/59A GB 2003659 A GB2003659 A GB 2003659A GB 958775 A GB958775 A GB 958775A
Authority
GB
United Kingdom
Prior art keywords
rectifier
operating
operating signal
resistor
signal
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
GB20036/59A
Inventor
Eugeniusz Antoszewski
John William Frederic Sherriff
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.)
English Electric Co Ltd
Original Assignee
English Electric 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
Priority to CA717181A priority Critical patent/CA717181A/en
Application filed by English Electric Co Ltd filed Critical English Electric Co Ltd
Priority to GB20036/59A priority patent/GB958775A/en
Priority to DEE19459A priority patent/DE1124587B/en
Priority to FR829646A priority patent/FR1259726A/en
Publication of GB958775A publication Critical patent/GB958775A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/28—Modifications for introducing a time delay before switching
    • 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
    • H02H3/093—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 with timing means
    • 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
    • H02H3/20—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 voltage

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

958,775. Semi-conductor switching circuits. ENGLISH ELECTRIC CO. Ltd. June 9, 1960 [June 11, 1959], No. 20036/59. Heading H3T. [Also in Division H2] In a protective relay arrangement having an operating time related to the magnitude of a unidirectional overcurrent or over-voltage operating signal, the timing means comprise a capacitor C3 arranged to be charged by the operating signal through a rectifier S3 connected in the blocking direction with respect to the polarity of the operating signal. The operating characteristic may be modified by a parallel.non-linear resistor NL and a linear resistor R7. For quick resetting, a discharge circuit including a rectifier S2 and resistor R8 and R5 may be provided. A further rectifier S1 and resistor R6 permit near instantaneous operating when the operating signal is very large and a Zener diode S4 protects the relay circuits when the signal is extremely large. The rectifiers S1 and S3 are selenium or copper oxide rectifiers and the rectifier S2 is a silicon or germanium rectifier. The operating signal is derived from transformers T2, T3 having their secondary windings connected in opposition so as to provide no resultant output under normal conditions. The transformer T3 is arranged to saturate at a lower input current than the transformer T2 so that the transformers have a resultant output under overload conditions, the output being rectified by a full-wave rectifier B1. The delayed output from the timing means is applied to a transistorized relay circuit which may be that of Specification 958,774.
GB20036/59A 1959-06-11 1959-06-11 Improvements in and relating to electrical relay circuit arrangements Expired GB958775A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA717181A CA717181A (en) 1959-06-11 Electric time delay circuits
GB20036/59A GB958775A (en) 1959-06-11 1959-06-11 Improvements in and relating to electrical relay circuit arrangements
DEE19459A DE1124587B (en) 1959-06-11 1960-06-10 Time delay device for electrical protective relays
FR829646A FR1259726A (en) 1959-06-11 1960-06-10 Electrical protection relays

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA717181T
GB20036/59A GB958775A (en) 1959-06-11 1959-06-11 Improvements in and relating to electrical relay circuit arrangements

Publications (1)

Publication Number Publication Date
GB958775A true GB958775A (en) 1964-05-27

Family

ID=76222739

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20036/59A Expired GB958775A (en) 1959-06-11 1959-06-11 Improvements in and relating to electrical relay circuit arrangements

Country Status (3)

Country Link
CA (1) CA717181A (en)
DE (1) DE1124587B (en)
GB (1) GB958775A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000400A (en) * 1977-06-23 1979-01-04 Matthews G Overload protection circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1241526B (en) * 1964-08-11 1967-06-01 Siemens Ag Current transformer circuit for selective protection

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE754059C (en) * 1940-12-20 1954-07-05 Ver Eisenbahn Signalwerke G M Delay relays, especially for railway safety devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000400A (en) * 1977-06-23 1979-01-04 Matthews G Overload protection circuit

Also Published As

Publication number Publication date
CA717181A (en) 1965-08-31
DE1124587B (en) 1962-03-01

Similar Documents

Publication Publication Date Title
GB1236082A (en) A system of overload protection by using superconducting conductors
US3116439A (en) Repeating circuit interrupter and battery charging circuit used therewith
GB868319A (en) Improvements relating to rectifier circuit arrangements
GB950596A (en) Time delay device
GB1115467A (en) Improvements in or relating to electrical circuit protection devices
GB958775A (en) Improvements in and relating to electrical relay circuit arrangements
GB981752A (en) Improvements in or relating to electrical protective relays
GB1465721A (en) Ground fault detector
GB1455280A (en) Circuit breaker having a polyphase control circuit
GB1176018A (en) Improvements in Definite-Time Relays.
GB823963A (en) Electric arc welding apparatus
GB1394455A (en) Ground fault detectors
US3160787A (en) Restraint operation relay employing zener diode
GB857687A (en) Improvements in or relating to generator control and protective system
GB918124A (en) Improvements in or relating to electric circuit protection and/or indication arrangements
GB1069626A (en) Improvements in electrical overload-protection systems
GB1350063A (en) Protection arrangements for ac distribution circuits
GB891187A (en) Frequency changer
GB926051A (en) Improvements in or relating to rectifier circuit arrangements
GB950183A (en) Improvements in and relating to electrical circuits employing transistor networks
GB1218074A (en) Over-current relay
GB865678A (en) A mechanical current converter
GB977132A (en) Load limiter
US2471216A (en) Low-voltage rectifier protection
GB932549A (en) Improvements in or relating to voltage regulating arrangements for reducing voltage flicker in an electric supply network