GB1047940A - Static time-lag overcurrent relay - Google Patents

Static time-lag overcurrent relay

Info

Publication number
GB1047940A
GB1047940A GB34357/63A GB3435763A GB1047940A GB 1047940 A GB1047940 A GB 1047940A GB 34357/63 A GB34357/63 A GB 34357/63A GB 3435763 A GB3435763 A GB 3435763A GB 1047940 A GB1047940 A GB 1047940A
Authority
GB
United Kingdom
Prior art keywords
current
capacitor
diode
relay
difference
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
GB34357/63A
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
Allmanna Svenska Elektriska AB
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 ASEA AB, Allmanna Svenska Elektriska AB filed Critical ASEA AB
Publication of GB1047940A publication Critical patent/GB1047940A/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

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

1,047,940. Protective arrangements. ALLM€NNA SVENSKA ELEKTRISKA A.B. Aug. 30, 1963 [Sept. 4, 1962], No. 34357/63. Heading H2K. When the current J 1 proportional to that in a protected circuit exceeds a reference current Jr a capacitor C in a static inverse time delay overcurrent relay arrangement is charged by the difference between the currents. In the arrangement shown, the reference current Jr flows through a diode V 3 and resistors R 1 , R 2 from an auxiliary source U 2 , a diode V 2 serving to keep this current constant. The current J 1 is obtained through a current transformer T and rectifier bridge L. Since the diode V 3 is conducting, it provides a path for the current J 1 until that current exceeds Jr. Thereafter the difference J 2 between these currents flows to capacitor C and resistor R. When the capacitor has been sufficiently charged a diode V 4 breaks down and a relay E is energized. This relay closes contacts E a to permit the rapid discharge of the capacitor and operates further contacts (not shown) to cause the opening of a circuitbreaker. The relay E may be a static device, e.g. a transistor.
GB34357/63A 1962-09-04 1963-08-30 Static time-lag overcurrent relay Expired GB1047940A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9538/62A SE316226B (en) 1962-09-04 1962-09-04

Publications (1)

Publication Number Publication Date
GB1047940A true GB1047940A (en) 1966-11-09

Family

ID=20276913

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34357/63A Expired GB1047940A (en) 1962-09-04 1963-08-30 Static time-lag overcurrent relay

Country Status (4)

Country Link
CH (1) CH403035A (en)
FR (1) FR1368499A (en)
GB (1) GB1047940A (en)
SE (1) SE316226B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237155A (en) * 1989-10-18 1991-04-24 Plessey Co Plc Electrical monitoring circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237155A (en) * 1989-10-18 1991-04-24 Plessey Co Plc Electrical monitoring circuit
GB2237155B (en) * 1989-10-18 1993-08-04 Plessey Co Plc Improvements relating to monitoring circuit arrangements

Also Published As

Publication number Publication date
CH403035A (en) 1965-11-30
SE316226B (en) 1969-10-20
FR1368499A (en) 1964-07-31

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