GB276640A - Improvements in and relating to excess current relays - Google Patents

Improvements in and relating to excess current relays

Info

Publication number
GB276640A
GB276640A GB19817/27A GB1981727A GB276640A GB 276640 A GB276640 A GB 276640A GB 19817/27 A GB19817/27 A GB 19817/27A GB 1981727 A GB1981727 A GB 1981727A GB 276640 A GB276640 A GB 276640A
Authority
GB
United Kingdom
Prior art keywords
phase
normal
current
relay
voltages
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
GB19817/27A
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of GB276640A publication Critical patent/GB276640A/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
    • H02H3/40—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 ratio of voltage and current

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

276,640. International General Electric Co., Inc., (Assignees of Allgemeine [Electricitats Ges.). Aug. 24, 1926, [Convention date]. Cut-out arrangements; electromagnetic switches. - In overload relays of the kind in which the action due to the current is opposed by the voltage of the circuit so that at normal voltages a heavy current is necessary to operate the relay, in order to obtain more reliable action particularly with two-phase and three-phase short-circuits the voltage coil is connected in series with an easily saturated ironcored inductance d, Fig. 3. By these means a proportionally smaller and substantially constant current is caused to traverse the voltage coil at low voltages up to 50 per cent of normal, and a proportionally larger and varying current at high voltages up to normal as indicated in Fig. 2 where the curve II represents the characteristics of the relay according to the invention and curve I represents the characteristics of the usual relay of this type. In the three-phase arrangement shown in Fig. 3, three balance-beam relays according to the invention are shown for protecting a three-phase line.
GB19817/27A 1926-08-24 1927-07-26 Improvements in and relating to excess current relays Expired GB276640A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE276640X 1926-08-24

Publications (1)

Publication Number Publication Date
GB276640A true GB276640A (en) 1927-11-03

Family

ID=6028162

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19817/27A Expired GB276640A (en) 1926-08-24 1927-07-26 Improvements in and relating to excess current relays

Country Status (1)

Country Link
GB (1) GB276640A (en)

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