GB987974A - Improvements in or relating to electrical protective relays - Google Patents

Improvements in or relating to electrical protective relays

Info

Publication number
GB987974A
GB987974A GB25283/60A GB2528360A GB987974A GB 987974 A GB987974 A GB 987974A GB 25283/60 A GB25283/60 A GB 25283/60A GB 2528360 A GB2528360 A GB 2528360A GB 987974 A GB987974 A GB 987974A
Authority
GB
United Kingdom
Prior art keywords
relay
capacitor
transistor
motor
resistor
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
GB25283/60A
Inventor
Eugeniwsz Antoszewski
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
Application filed by English Electric Co Ltd filed Critical English Electric Co Ltd
Priority to GB25283/60A priority Critical patent/GB987974A/en
Priority to FR868566A priority patent/FR1303031A/en
Publication of GB987974A publication Critical patent/GB987974A/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
    • H02H3/093—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
    • H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
    • H02H3/343—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system using phase sequence analysers

Abstract

987,974. Protective arrangements. ENGLISH ELECTRIC CO. Ltd. July 14, 1961 [July 20, 1960], No. 25283/60. Heading H2K. [Also in Division H3] A polyphase time-overcurrent relay arrangement, e.g. for an induction motor RL, comprises a phase sequence filter, rectifiers Bp, Bn and a series-parallel resistance network R7 . . . R9 for deriving a unidirectional relay operating current dependent on a combination of the positive and negative phase sequence components of the current taken by the motor. When a capacitor C3 is charged by the relay operating current to a predetermined value, the transistor amplifier T2, T3 of Specification 958,774 energizes a protective relay AUX. The charging of the capacitor C3 is controlled by a transistor T1 which under normal load conditions is conducting, due to a positive bias applied to its base by means of resistors R15 ... R17, and permits the capacitor to acquire a standing charge dependent on the voltage across a resistor R14 and a diode D3 in series with the transistor T1. When an overload occurs, a sufficiently high negative potential exists across a resistor R11 and diode D1 to stop the transistor T1 conducting and the capacitor C3 is charged fully by the relay operating current to effect operation of the relay AUX. When the motor is switched off, any charge in the capacitor C3 is slowly discharged through a diode D4 and a resistor P6 providing a long time reset. Thus should an overload fault condition exist when the motor is first switched on, the transistor T1 does not conduct and as the capacitor has no standing charge, a longer time elapses before relay operation occurs. Thus the relay arrangement provides " hot " and " cold " characteristics similar to those of a thermal overload relay.
GB25283/60A 1960-07-20 1960-07-20 Improvements in or relating to electrical protective relays Expired GB987974A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB25283/60A GB987974A (en) 1960-07-20 1960-07-20 Improvements in or relating to electrical protective relays
FR868566A FR1303031A (en) 1960-07-20 1961-07-20 Protection relay systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB25283/60A GB987974A (en) 1960-07-20 1960-07-20 Improvements in or relating to electrical protective relays
FR868566A FR1303031A (en) 1960-07-20 1961-07-20 Protection relay systems

Publications (1)

Publication Number Publication Date
GB987974A true GB987974A (en) 1965-03-31

Family

ID=68621071

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25283/60A Expired GB987974A (en) 1960-07-20 1960-07-20 Improvements in or relating to electrical protective relays

Country Status (2)

Country Link
FR (1) FR1303031A (en)
GB (1) GB987974A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2306569A1 (en) * 1975-04-01 1976-10-29 Gen Electric FILTER FOR SYMMETRICAL COMPONENTS AND DEVICE INCORPORATING SUCH FILTERS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2306569A1 (en) * 1975-04-01 1976-10-29 Gen Electric FILTER FOR SYMMETRICAL COMPONENTS AND DEVICE INCORPORATING SUCH FILTERS

Also Published As

Publication number Publication date
FR1303031A (en) 1962-09-07

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