GB1134443A - Circuit arrangement for detecting the end of the firing period of converter valves by means of current transformers - Google Patents

Circuit arrangement for detecting the end of the firing period of converter valves by means of current transformers

Info

Publication number
GB1134443A
GB1134443A GB327166A GB327166A GB1134443A GB 1134443 A GB1134443 A GB 1134443A GB 327166 A GB327166 A GB 327166A GB 327166 A GB327166 A GB 327166A GB 1134443 A GB1134443 A GB 1134443A
Authority
GB
United Kingdom
Prior art keywords
current
transformer
zero
valve
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
GB327166A
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of GB1134443A publication Critical patent/GB1134443A/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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

1,134,443. Converting. LICENTIA PATENTVERWALTUNGS G.m.b.H. 25 Jan., 1966 [26 Jan., 1965], No. 3271/66. Heading H2F. In a converter circuit the moment at which a valve current i 1 falls to zero is detected by a current transformer (4), Fig. 1 (not shown), having its primary in series with the valve, and its secondary connected to an LR circuit. If the current waveform is asymmetrical, and if the transformer saturates at 2 then, with a purely resistive load, the secondary current (shown dashed) would drop to zero, giving a false " valve current zero " indication. To overcome this the inductance (2) is connected in series with the resistance (3) across the transformer secondary winding. If the time constant of the secondary circuit is sufficiently high, then when the transformer saturates the secondary current i 2 is maintained (but decaying exponentially) until the primary current falls at the end of the half-cycle so that correct operation is obtained. A diode may be connected across the secondary winding of the transformer to compensate for error due to magnetizing current (though this small error may be neglected). Zener diodes may shunt the secondary to prevent over-voltages.
GB327166A 1965-01-26 1966-01-25 Circuit arrangement for detecting the end of the firing period of converter valves by means of current transformers Expired GB1134443A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1965L0049813 DE1261595B (en) 1965-01-26 1965-01-26 Circuit arrangement for detecting the end of the burning time of converter valves via AC converters with a burden circuit

Publications (1)

Publication Number Publication Date
GB1134443A true GB1134443A (en) 1968-11-20

Family

ID=7273161

Family Applications (1)

Application Number Title Priority Date Filing Date
GB327166A Expired GB1134443A (en) 1965-01-26 1966-01-25 Circuit arrangement for detecting the end of the firing period of converter valves by means of current transformers

Country Status (5)

Country Link
AT (1) AT256995B (en)
CH (1) CH431712A (en)
DE (1) DE1261595B (en)
GB (1) GB1134443A (en)
SE (1) SE333020B (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1029457B (en) * 1956-11-12 1958-05-08 Licentia Gmbh Arrangement for the protection of transformers and their switching devices
DE1078685B (en) * 1958-07-14 1960-03-31 Licentia Gmbh Device for the protection of transformers against half-wave asymmetry, in particular with spark plug-controlled discharge vessels

Also Published As

Publication number Publication date
SE333020B (en) 1971-03-01
CH431712A (en) 1967-03-15
AT256995B (en) 1967-09-11
DE1261595B (en) 1968-02-22

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