GB892816A - Protective means for three-phase systems - Google Patents

Protective means for three-phase systems

Info

Publication number
GB892816A
GB892816A GB1153358A GB1153358A GB892816A GB 892816 A GB892816 A GB 892816A GB 1153358 A GB1153358 A GB 1153358A GB 1153358 A GB1153358 A GB 1153358A GB 892816 A GB892816 A GB 892816A
Authority
GB
United Kingdom
Prior art keywords
rectifier
resistors
relay
capacitor
circuit
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
GB1153358A
Inventor
Norman Arthur Parish
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.)
Lucas Support Services Ltd
Original Assignee
Rotax 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 Rotax Ltd filed Critical Rotax Ltd
Priority to GB1153358A priority Critical patent/GB892816A/en
Publication of GB892816A publication Critical patent/GB892816A/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
    • H02H3/26—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
    • H02H3/353—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 involving comparison of phase voltages
    • 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)
  • Protection Of Generators And Motors (AREA)

Abstract

892,816. Protective cut-out arrangements. ROTAX Ltd. July 10, 1959 [April 11, 1958], No. 11533/58. Class 38 (5). An arrangement for protecting a three-phase motor comprises a capacitor Y and a pair of resistors R1, R2 connected in series between two phases, a rectifier MR1 connected between the star point N of the motor and the point S between the resistors, and a relay RL1 connected across the rectifier. The values of the capacitor and resistors are such that under normal conditions S and N are equipotential points, but in the event of an open circuit, short-circuit, phase reversal or earth fault, a potential difference occurs between the points and the relay RL1 is operated. The rectifier may be a full-wave rectifier, Fig. 2 (not shown). If the supply is earthed, the capacitor Y may be connected to a terminal K1 so that an earth fault can be detected. The relay RL1 may close the circuit for a warning device or automatic control means.
GB1153358A 1958-04-11 1958-04-11 Protective means for three-phase systems Expired GB892816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1153358A GB892816A (en) 1958-04-11 1958-04-11 Protective means for three-phase systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1153358A GB892816A (en) 1958-04-11 1958-04-11 Protective means for three-phase systems

Publications (1)

Publication Number Publication Date
GB892816A true GB892816A (en) 1962-03-28

Family

ID=9987984

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1153358A Expired GB892816A (en) 1958-04-11 1958-04-11 Protective means for three-phase systems

Country Status (1)

Country Link
GB (1) GB892816A (en)

Similar Documents

Publication Publication Date Title
US3513353A (en) Voltage monitoring circuit
GB876415A (en) Improvements in or relating to undervoltage sensing circuits
GB1169706A (en) An Electrical Fault Detector
GB827902A (en) Improvements in or relating to rectifier systems
GB1021502A (en) Improvements in and relating to electrical protective relay systems
GB1135785A (en) Circuit arrangement for the loop supervision and for discerning loop resistances
US3843908A (en) Voltage failure sensing circuit
GB871957A (en) Improvements in and relating to electrical protective relay systems
GB1531430A (en) Segregated phase comparing relays
GB1513920A (en) Over current protection circuits
GB1031932A (en) A protective device for a super-conductor
GB892816A (en) Protective means for three-phase systems
GB1525475A (en) Phase failure-and null current-detector especially for an electronic motor protection relay possessing current-dependent triggering
GB1516674A (en) Multi-phase voltage sensing switching device
GB1097809A (en) Improved circuit breaker control system
GB1215248A (en) Arrangements for short-circuit indication or protection in unidirectional-voltage supply systems
GB1008135A (en) Improvements in circuits for protecting electrical loads from an adverse condition
GB1415534A (en) Safety devices in electrical appliances
GB858646A (en) Improvements in or relating to the protection of alternating current generators
US2977520A (en) Synchronous motor control
GB1309820A (en) Gatecontrolled phase failure protection circuit
US3023345A (en) Three phase protective relay system responsive to amplitude of ripple voltage
GB978206A (en) A circuit and method for protecting a three phase star connected dynamo-electric machine
GB844161A (en) Improvements in or relating to protective devices for 3-phase a.c. circuits
GB1307794A (en) Apparatus for the control monitoring and testing of an airborne electrical system