GB432428A - Improved protective arrangements for electric circuits - Google Patents

Improved protective arrangements for electric circuits

Info

Publication number
GB432428A
GB432428A GB257634A GB257634A GB432428A GB 432428 A GB432428 A GB 432428A GB 257634 A GB257634 A GB 257634A GB 257634 A GB257634 A GB 257634A GB 432428 A GB432428 A GB 432428A
Authority
GB
United Kingdom
Prior art keywords
arresters
circuit
transformer
liable
relay
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
GB257634A
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers 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 Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Priority to GB257634A priority Critical patent/GB432428A/en
Publication of GB432428A publication Critical patent/GB432428A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

432,428. Protective arrangements. SIEMENS BROS. & CO., Ltd., Caxton House, Tothill Street, Westminster, and SUTTON, G. W., 25, Cranleigh Road, Merton Park, London. Jan. 25, 1934, No. 2576. [Class 38 (iv)] A telephone circuit TE liable to excess voltages is connected to a similar circuit TM situated in a dangerous quarter liable to explosions, e.g. in a mine, by means of a loosely coupled transformer TR the secondary winding, or a tertiary winding coupled thereto, being connected to one or more vapour discharge type arresters NT. The arresters may be connected across the terminals of the secondary winding from which the outgoing circuit may be tapped at a lower voltage. In addition a relay R of the self-locking type may be connected in parallel with the arresters NT in series with a resistance RE so that in the event of the arresters failing the relay R operates and its contacts r short circuit the primary of the transformer TR. The transformer core, and /or a shield therein, may be earthed.
GB257634A 1934-01-23 1934-01-23 Improved protective arrangements for electric circuits Expired GB432428A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB257634A GB432428A (en) 1934-01-23 1934-01-23 Improved protective arrangements for electric circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB257634A GB432428A (en) 1934-01-23 1934-01-23 Improved protective arrangements for electric circuits

Publications (1)

Publication Number Publication Date
GB432428A true GB432428A (en) 1935-07-25

Family

ID=9741995

Family Applications (1)

Application Number Title Priority Date Filing Date
GB257634A Expired GB432428A (en) 1934-01-23 1934-01-23 Improved protective arrangements for electric circuits

Country Status (1)

Country Link
GB (1) GB432428A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1191435B (en) * 1959-12-08 1965-04-22 Siemens Ag Circuit arrangement for connecting an intrinsically safe telephone station to a non-intrinsically safe dialing center

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1191435B (en) * 1959-12-08 1965-04-22 Siemens Ag Circuit arrangement for connecting an intrinsically safe telephone station to a non-intrinsically safe dialing center

Similar Documents

Publication Publication Date Title
GB432428A (en) Improved protective arrangements for electric circuits
GB475130A (en) Improvements in or relating to protective arrangements for transformers
GB313208A (en) Improvements in or relating to electrical indicating and/or recording apparatus
GB1254788A (en) Improvements in or relating to devices for indicating the condition of a switch
GB133339A (en)
GB794106A (en) Improvements in earth leakage protective devices
US1894338A (en) Connection for high voltage lines
GB400962A (en) Improvements relating to on-load tap changing arrangements for electric transformers
GB712239A (en) Improvements in or relating to circuit arrangements for operating low pressure electric discharge lamps
GB747290A (en) Improvements relating to electrical relays
GB540973A (en) Improvements in or relating to electric protective systems
GB535446A (en) Improvements in and relating to earth leakage protective systems
GB714687A (en) Improvements in or relating to electric cirucit arrangements comprising electric discharge lamps
GB841181A (en) Improvements in and relating to protective circuit-breakers
Steinmetz Constant potential series lighting
GB1309972A (en) Protective arrangement against earth leakage currents for a multi- phase electric supply line
GB402084A (en) Improvements in high potential transformers
GB354419A (en) Improvements in apparatus for the detection of smoke from furnaces
GB1114725A (en) Electrical protection circuit
GB391401A (en) Improvements in and relating to surge indicators
GB377829A (en) Improvements in and relating to the protection of direct current networks
GB530198A (en) Improvements in or relating to the protection of electric rectifier systems
GB278757A (en) Improvements in and relating to safety arrangements for rontgen apparatus
GB396853A (en) Improvements in and relating to electric protective systems
GB260651A (en) Improvements in or relating to a switch for the electrical circuits of wireless installations