GB870407A - Improvements in or relating to grid-controlled mercury arc rectifier installations - Google Patents

Improvements in or relating to grid-controlled mercury arc rectifier installations

Info

Publication number
GB870407A
GB870407A GB8502/59A GB850259A GB870407A GB 870407 A GB870407 A GB 870407A GB 8502/59 A GB8502/59 A GB 8502/59A GB 850259 A GB850259 A GB 850259A GB 870407 A GB870407 A GB 870407A
Authority
GB
United Kingdom
Prior art keywords
potential
grid
converter
circuit
resistances
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
GB8502/59A
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 GB870407A publication Critical patent/GB870407A/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
    • H02H7/127—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 having auxiliary control electrode to which blocking control voltages or currents are applied in case of emergency

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

870,407. Converting. SIEMENS-SCHUCKERTWERKE A.G. March 11, 1959 [March 11, 1958], No. 8502/59. Class 38 (2). A grid-blocking arrangement for protecting a mercury arc converter when a short-circuit or back-fire occurs comprises a bi-stable flip-flop circuit connected through a unidirectional conducting device to a grid control circuit. Converter A supplied through mains transformer K has a grid control set B which is supplied with unidirectional control voltage U st . The flip-flop circuit includes a transistor Tl with resistances R3, R4, R5 chosen so that T1 is normally conductive and its collector is at potential U2 which is higher than all values of U st so that no current flows through diode D1. In the event of a short-circuit or back-fire in the converter the negative current at point E increases, setting up a negative potential at the base of a second transistor T2, overcoming the positive potential set up through resistances R2, R6. T2 therefore begins to conduct and the base of T1 is driven positive through resistances R5, causing T1 to stop conducting. Its collector potential falls and the control potential U st causes current to flow through diode D1 and resistance R1 cutting off the grid firing pulses to A. The flow of current through D1 causes the base of T2 to be brought to a negative potential through R1, R2 so that the circuit remains in this state after the disturbance has ended. Transistor T3, connected to T2, operates a relay H to signal the presence of the fault. The converter is restarted by operating push-button M.
GB8502/59A 1958-03-11 1959-03-11 Improvements in or relating to grid-controlled mercury arc rectifier installations Expired GB870407A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE870407X 1958-03-11

Publications (1)

Publication Number Publication Date
GB870407A true GB870407A (en) 1961-06-14

Family

ID=6806024

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8502/59A Expired GB870407A (en) 1958-03-11 1959-03-11 Improvements in or relating to grid-controlled mercury arc rectifier installations

Country Status (1)

Country Link
GB (1) GB870407A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3218541A (en) * 1960-03-22 1965-11-16 English Electric Co Ltd Polyphase electrical converter equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3218541A (en) * 1960-03-22 1965-11-16 English Electric Co Ltd Polyphase electrical converter equipment

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