[go: up one dir, main page]

GB699300A - Improvements in or relating to electric protective arrangements - Google Patents

Improvements in or relating to electric protective arrangements

Info

Publication number
GB699300A
GB699300A GB2477850A GB2477850A GB699300A GB 699300 A GB699300 A GB 699300A GB 2477850 A GB2477850 A GB 2477850A GB 2477850 A GB2477850 A GB 2477850A GB 699300 A GB699300 A GB 699300A
Authority
GB
United Kingdom
Prior art keywords
outputs
fault
network
opposition
rectifier
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
GB2477850A
Inventor
Norman Sadler Ellis
Clemett Harrison Lackey
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.)
A Reyrolle and Co Ltd
Original Assignee
A Reyrolle and 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 A Reyrolle and Co Ltd filed Critical A Reyrolle and Co Ltd
Priority to GB2477850A priority Critical patent/GB699300A/en
Priority to FR1043643D priority patent/FR1043643A/en
Priority to CH297582D priority patent/CH297582A/en
Publication of GB699300A publication Critical patent/GB699300A/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
    • H02H3/44—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 the rate of change of electrical quantities
    • 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
    • H02H3/28—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
    • H02H3/30—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
    • H02H3/307—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel involving comparison of quantities derived from a plurality of phases, e.g. homopolar quantities; using mixing transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Static Devices (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

699,300. Protective cut-out arrangements. REYROLLE & CO., Ltd., A. Oct. 1, 1951 [Oct. 10, 1950], No. 24778/50. Class 38 (v) A fault-responsive arrangement for energising the starting device G of the carrier-current protective gear of, e.g. Specifications 598,581 or 610,610, comprises an operating and a bias network, H<SP>1</SP>, H<SP>2</SP>, respectively, both fed from the current transformer secondaries D<SP>1</SP>, D<SP>2</SP>, D<SP>3</SP>, the outputs of the networks being connected in opposition and normally balanced, and means for delaying the effective response of the network H<SP>2</SP> to sudden changes in the line currents, so that the outputs unbalance and device G is energised. In one form, Fig. 3, the networks H<SP>1</SP>, H<SP>2</SP> are arranged respectively, to segregate positive, and positive and negative phase-sequence components, which are applied over saturable transformers U, Q to bridge rectifiers U<SP>1</SP>, Q<SP>1</SP>. The rectified outputs are connected in opposition, that from rectifier U<SP>1</SP> across a resistance U<SP>3</SP> and that from Q<SP>1</SP> across a condenser Q<SP>2</SP> in series with a resistance Q<SP>3</SP> which provides a time-delay in the charging of the condenser. A rectifier Q<SP>4</SP> ensures a rapid discharge. In a modification, Fig. 2 (not shown), the network H<SP>1</SP> comprises the system described in Specification 683,989. Either arrangement ensures the detection of a fault in cases where the maximum permissible load current under some conditions may exceed the three-phase fault current under other conditions.
GB2477850A 1950-10-10 1950-10-10 Improvements in or relating to electric protective arrangements Expired GB699300A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2477850A GB699300A (en) 1950-10-10 1950-10-10 Improvements in or relating to electric protective arrangements
FR1043643D FR1043643A (en) 1950-10-10 1951-10-09 Improvements to electrical line protection devices
CH297582D CH297582A (en) 1950-10-10 1951-10-10 Device intended to make a protection installation for a three-phase electrical network effective.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2477850A GB699300A (en) 1950-10-10 1950-10-10 Improvements in or relating to electric protective arrangements

Publications (1)

Publication Number Publication Date
GB699300A true GB699300A (en) 1953-11-04

Family

ID=10217112

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2477850A Expired GB699300A (en) 1950-10-10 1950-10-10 Improvements in or relating to electric protective arrangements

Country Status (3)

Country Link
CH (1) CH297582A (en)
FR (1) FR1043643A (en)
GB (1) GB699300A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735962A (en) * 1956-02-21 Transformers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735962A (en) * 1956-02-21 Transformers

Also Published As

Publication number Publication date
CH297582A (en) 1954-03-31
FR1043643A (en) 1953-11-10

Similar Documents

Publication Publication Date Title
GB1021502A (en) Improvements in and relating to electrical protective relay systems
US3303390A (en) Distance relaying
GB699300A (en) Improvements in or relating to electric protective arrangements
US2735962A (en) Transformers
GB858646A (en) Improvements in or relating to the protection of alternating current generators
US2974257A (en) Protective apparatus for power systems
US1873964A (en) Rectifier isolating apparatus
GB923292A (en) Apparatus for detecting earth faults in electric current supply systems
GB1280704A (en) Improvements relating to the protection of three-phase alternators
SE8001097L (en) DIFFERENTIAL PROTECTION
GB566805A (en) Improvements in electric impedance relay means and in protective equipment for electrical power systems utilising same
US2265591A (en) Electric valve protective system
GB807125A (en) Protective apparatus for electric current distributing systems
GB745964A (en) Improvements in or relating to protective control systems for alternating current generators
GB1075102A (en) Alternating current generator excitation systems
GB742189A (en) Improvements in or relating to electric protective arrangements
GB1020101A (en) Unbalanced current protection system for use with paralleled generators
GB878924A (en) Means for protecting three phase electric systems
GB767189A (en) Improvements in or relating to electric protective systems
GB1044621A (en) Improvements in and relating to inductive reactance devices
GB921030A (en) A differential protective system for a transformer
GB636411A (en) Improvements in or relating to protective devices for three-phase electric apparatus
GB902050A (en) Improvements in or relating to electric network protection systems
GB1350063A (en) Protection arrangements for ac distribution circuits
GB926051A (en) Improvements in or relating to rectifier circuit arrangements