GB909006A - Improvements in or relating to electrical protection circuits - Google Patents

Improvements in or relating to electrical protection circuits

Info

Publication number
GB909006A
GB909006A GB3209859A GB3209859A GB909006A GB 909006 A GB909006 A GB 909006A GB 3209859 A GB3209859 A GB 3209859A GB 3209859 A GB3209859 A GB 3209859A GB 909006 A GB909006 A GB 909006A
Authority
GB
United Kingdom
Prior art keywords
capacitor
potential difference
resistance arrangement
resistors
arrangement
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
GB3209859A
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 Schuckertwerke AG
Siemens AG
Original Assignee
Siemens Schuckertwerke AG
Siemens AG
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 Schuckertwerke AG, Siemens AG filed Critical Siemens Schuckertwerke AG
Publication of GB909006A publication Critical patent/GB909006A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H02H7/1257—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to short circuit or wrong polarity in output circuit
    • 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
    • H02H3/02—Details
    • H02H3/027—Details with automatic disconnection after a predetermined time
    • 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
    • H02H3/08—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 excess current
    • H02H3/093—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 excess current with timing means
    • 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
    • H04M1/745—Protection devices or circuits for voltages surges on the line

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

909,006. Protective arrangements. SIEMENS-SCHUCKERTWERKE A.G. Sept. 21, 1959 [Sept. 30, 1958], No. 32098/59. Class 38 (5). [Also in Group XL (c)] A protective arrangement includes a time delay circuit having two terminals between which a potential difference is set up, a resistance arrangement and a capacitor in series between the terminals, a switching device and means responsive to the voltage across the capacitor for actuating the switching device when that voltage exceeds a particular value, the resistance arrangement being such that its effective value is so reduced when the potential difference rises that the percentage decrease in the charging time constant of the resistance arrangement and the capacitor exceeds the percentage increase in the potential difference. The potential difference may be derived from overload conditions in a protected circuit. In Fig. 1, the resistance arrangement comprises linear resistors 11, 12 and voltage-dependent resistors 13, 14. A thyratron 16 has its grid connected to the junction between the resistance arrangement and the capacitor 15. A relay (not shown) is connected in series with the anode of the thyratron. In Fig. 2, the resistance arrangement includes resistors 24 ... 26 and diodes 27, 28, the resistors 25, 26 being connected to junction points on a potentiometer 21 ... 23. In this embodiment the diode 27 becomes conductive when 1.6 times the rated load is exceeded and the diode 28 becomes conductive when twice the rated load is exceeded. Fig. 3 (not shown) illustrates an arrangement similar to Fig. 2 in which instantaneous operation occurs at three times the rated load.
GB3209859A 1958-09-30 1959-09-21 Improvements in or relating to electrical protection circuits Expired GB909006A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES60098A DE1065068B (en) 1958-09-30 1958-09-30 Overload protection for electrical systems with high overload sensitivity

Publications (1)

Publication Number Publication Date
GB909006A true GB909006A (en) 1962-10-24

Family

ID=7493852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3209859A Expired GB909006A (en) 1958-09-30 1959-09-21 Improvements in or relating to electrical protection circuits

Country Status (4)

Country Link
CH (1) CH375427A (en)
DE (1) DE1065068B (en)
FR (1) FR1244330A (en)
GB (1) GB909006A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1279820B (en) * 1965-08-19 1968-10-10 Licentia Gmbh Electronic activation, especially for overcurrent time relays

Also Published As

Publication number Publication date
CH375427A (en) 1964-02-29
FR1244330A (en) 1960-10-28
DE1065068B (en) 1959-09-10

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