GB844161A - Improvements in or relating to protective devices for 3-phase a.c. circuits - Google Patents

Improvements in or relating to protective devices for 3-phase a.c. circuits

Info

Publication number
GB844161A
GB844161A GB30674/58A GB3067456A GB844161A GB 844161 A GB844161 A GB 844161A GB 30674/58 A GB30674/58 A GB 30674/58A GB 3067456 A GB3067456 A GB 3067456A GB 844161 A GB844161 A GB 844161A
Authority
GB
United Kingdom
Prior art keywords
phase
voltage
impedance
phases
equal
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
GB30674/58A
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.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
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 La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Publication of GB844161A publication Critical patent/GB844161A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/004—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of incorrect phase sequence; with switching for obtaining correct phase sequence

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

844,161. Protective cut-out arrangements. TELEMECANIQUE ELECTRIQUE. Oct. 8, 1956 [Nov. 2, 1955], No. 30674/56. Class 38 (5). For protection against incorrect phase rotation or the failure of a phase in a three-phase system, the winding Z of a relay is connected between a neutral point N formed by three equal impedances Z<SP>1</SP> starconnected to the three phases L1, L2, L3 and the junction point M of a resistor R and an impedance Z<SP>11</SP> connected in series between two of the phases, the impedance Z<SP>11</SP> having a value equal to that of the resistor R but an argument of #/3. Under normal conditions the voltage between M and N is equal in magnitude to the phase-to-earth voltage of the system and the winding Z is fully energized, but with incorrect phase rotation no voltage exists between M and N and with failure of a phase this voltage would not exceed one third of the normal voltage between phases. The impedances Z<SP>1</SP> may be inductive, capacitative or resistive and the impedance Z<SP>11</SP> may be either inductive or capacitative. The relay Z may be energized through a full-wave rectifier and its contacts may control an electromagnetic switch and a warning circuit.
GB30674/58A 1955-11-02 1956-10-08 Improvements in or relating to protective devices for 3-phase a.c. circuits Expired GB844161A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR844161X 1955-11-02

Publications (1)

Publication Number Publication Date
GB844161A true GB844161A (en) 1960-08-10

Family

ID=9312276

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30674/58A Expired GB844161A (en) 1955-11-02 1956-10-08 Improvements in or relating to protective devices for 3-phase a.c. circuits

Country Status (1)

Country Link
GB (1) GB844161A (en)

Similar Documents

Publication Publication Date Title
GB1021502A (en) Improvements in and relating to electrical protective relay systems
US3604982A (en) Ground fault and overload current interrupting apparatus
US3303390A (en) Distance relaying
US3532935A (en) Static network protective relay
US2122107A (en) Protecting three-phase apparatus
GB844161A (en) Improvements in or relating to protective devices for 3-phase a.c. circuits
GB1097809A (en) Improved circuit breaker control system
GB858646A (en) Improvements in or relating to the protection of alternating current generators
US1752947A (en) Protective system
US3023345A (en) Three phase protective relay system responsive to amplitude of ripple voltage
US3021453A (en) Polyphase electroresponsive apparatus
GB218938A (en) Improvements in and relating to a protective device for an alternating current system
US1617377A (en) Relay
GB619015A (en) Improvements in or relating to the protection of direct current electrical feeders
GB258904A (en) Improvements in electrical protective arrangements
GB653355A (en) Improvements in or relating to protective devices for electric circuits
GB535446A (en) Improvements in and relating to earth leakage protective systems
GB1455845A (en) Ground fault protection system
GB556014A (en) Improvements in and relating to protective systems for alternating current circuits and apparatus therefor
SU100547A2 (en) Device for determining the form of a ground fault in high-voltage electrical networks with a grounded neutral
GB892816A (en) Protective means for three-phase systems
GB648207A (en) Improvements in protective devices for electric circuits
GB1305966A (en)
GB549679A (en) Improvements in or relating to control and protective systems for electrical apparatus
GB540973A (en) Improvements in or relating to electric protective systems