• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A circuit arrangement for monitoring the current inbalance in two parallel-connected converter branches, each of which includes at least two series-connected converter valves. The anodes and cathodes, respectively, of adjacent converter valves in a given branch are connected together via cross-connections containing current transformers. A differential current transformer is provided at the output junction point of the two converter branches. Starting with the output signal of the differential current transformer, the exact current misdistribution for each adjacent converter valve pair is determined via summing amplifiers by adding the currents of the transverse transformers. A protective measure is triggered if a current misdistribution occurs.
    公开号:SU841617A3
    申请号:SU792730353
    申请日:1979-02-19
    公开日:1981-06-23
    发明作者:Клаус Ахим；Гайссинг Хайнрих；Ульбрих Вилли
    申请人:Сименс Аг (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the control and protection of valves in static converters.
    A device for monitoring is known. 5 of the current distribution in parallel branches of a static converter, containing a current transformer loaded with resistors and connected through a rectifier to a reacting OR 10 gan [1].
    The disadvantage of this device is the limited functionality in the presence of series-connected valves in the branches. (5
    The closest to the proposed technical means and the achieved result is a device for monitoring the current distribution in two parallel branches of a static 20 converter in the presence of series-connected valves in each branch, pairwise connected by equalizing wires, containing a current transformer, the 25 primary windings of which are included in the opposite direction cathode circuits of the supporting pair of valves, and the secondary through the main amplifier and threshold organ is connected] with the executive body 12]. thirty
    The disadvantage of this device is the limited functionality due to the lack of control for the distribution current between the valves of each pair.
    The purpose of the invention is the expansion of functionality.
    This goal is achieved by the fact that the device is equipped for each pair of valves, in addition to the secondary, with an additional current transformer, an amplifier with a gain of two times the gain of the main amplifier, threshold and actuators, and the primary wire of each pair of valves includes a primary winding of an additional current transformer, the secondary winding of which is connected to the first input of the additional amplifier, the second input of which is connected to the output of the amplifier connected to the previous s pair of valves, and exits through additional amplifiers threshold bodies connected with additional executive.
    In FIG. 1 shows a diagram of a device; in FIG. 2 - embodiment of threshold and executive bodies.
    Two parallel connected branches 1 and 2 of the static converter consist of three thyristors 3-5 connected in series. Branches 1 and 2 are connected to each other at points 6 and 7. Anodes of adjacent gates 3 and cathodes of adjacent gates 4 are connected 'to each other through equalizing. wire 8, which includes the primary winding of the current transformer 9. The secondary winding of the current transformer is connected to the load resistance, from which the output voltage is proportional to the equalizing current. Anodes of adjacent valves 4 and cathodes of adjacent valves 5 are interconnected via equalizing wire 11, which includes the primary winding 12 of the current transformer. The secondary winding of the current transformer is connected to the load resistance 13. To obtain the difference between the currents flowing through adjacent thyristors 3, primary windings 16 of a current transformer loaded with resistance 17 are included in their cathode circuits 14 and 15. As a current transformer 9 (it is connected to thyristors 3, 4 at point 18), 12 and 16, feed-through transformers can be used, with wire lengths 14 and 15 being conducted through the measuring holes of the transformer 16 out of phase.
    The output voltage of the transformer 16 is supplied through a resistance 19 to an amplifier 20 with a feedback resistance 21. At the output of the amplifier -20, the signal is proportional to the current difference in the thyristors 3. This signal through the block 22 of the formation of the absolute value and the threshold organ 23 is fed to the actuator - relay 24.
    To control the distribution of currents In thyristors 4, a signal from resistance 10 is fed through resistance 25 to the first input of a summing amplifier 26, to a second input of which a signal from amplifier 20 is fed through a resistance 27. Resistance 28 is included in the feedback circuit of amplifier 26. The output signal of amplifier 26 through the block 29 of the formation of the absolute value and the threshold organ 30 on the relay 31.
    Monitoring the distribution of currents in thyristors 5 is carried out in a similar way using a summing amplifier 32 with its resistances 33, 34 and 35, an absolute value generating unit 36, a threshold organ 37 and a relay 38. The gain of the amplifier 20 should be equal to half the gain of the summing amplifiers 26, 32.
    Contained in a dashed-dotted rectangle in FIG. 1, the circuit 39 of the series-connected unit 22 for forming the absolute value and the threshold organ 23 can be replaced by the circuit shown in FIG. 2. The output voltage of the amplifier 20 (26, 32) goes directly to the inverting input of the threshold organ, made on the amplifier 40, to the non-inverting input of which a constant voltage is applied, which sets the threshold value when it exceeds which the relay 41 is turned on. The output signal of the amplifier 20 (26 , 32) through the inverter 42 is also supplied to the inverting input of the amplifier 43 through the inverter 42. There is a set voltage at the non-inverting input of the amplifier 43, and the relay • 44 is connected to the output. ·.
    Operational amplifiers may be used as all amplifiers used in the device.
    权利要求:
    Claims (2)
    [1]
    threshold and executive bodies. Two parallel-connected branches 1 and 2 of the static converter consist of three thyristors connected in series, 3-5. The branches 1 and 2 are connected to each other at points 6 and 7. The anodes of adjacent valves 3 and the cathodes of adjacent valves 4 are connected to each other via an equalization wire 8, which includes the primary winding of the current transformer 9. The secondary winding of the current transformer 9 is connected to the load resistance 10, from which the output voltage is removed, proportional to the balancing current. The anodes of the adjacent valves 4 and the cathodes of the adjacent valves 5 are interconnected via a balancing wire 11, which includes the primary winding 12 of the current transformer. The secondary winding 12 of the current transformer is connected to the load resistance 13. To obtain the difference of the currents flowing through adjacent thyristors 3, the primary windings 16 of the current transformer loaded with resistance 17 are included in their cathode circuits 14 and 15. As a current transformer 9 (it is connected to thyristors 3, 4 at point 18), 12 and 16, feed-through transformers can be used, and from cutting the wires 14 and 15 are conducted through the measuring openings of the transformer 16 in antiphase. The output of the transformer 16 is fed through a resistor 19 to an amplifier 20 with a feedback resistance of 21. At the output of the -20 signal, the signal is proportional to the difference in the currents in thyristors 3. This signal through the absolute value generating unit 22 and the threshold organ 23 is fed to the actuator - relay 24. To control the distribution of the currents S to thyristors 4, the signal from the resistance 10 through the resistance 25 receives the first input of the summing amplifier 26, to the second input of which the signal from the amplifier 20 is supplied through the resistance 27. The resistance 28 is included in the feedback circuit of the amplifier 26. The output signal of the amplifier 26 is fed through the formation unit 29 absolute value and threshold organ 30 on relay 31. The control of the distribution of currents in thyristors 5 is carried out in a similar way with the help of summing amplifier 32 with its resistances 33, 34 and 35, the absolute value generating unit 36, threshold organ 37 and relay 38. The gain the amplifier 20 should be equal to half the amplification factors of the summing amplifiers 26, 32. With the bar in the dash-dotted box in FIG. 1, the circuit 39 of the series-connected absolute value generation unit 22 and the threshold organ 23 may be replaced by the circuit shown in FIG. 2. The output voltage of amplifier 20 (26, 32) goes directly to the inverting input of a threshold organ, made on amplifier 40, to a non-inverting input of which a constant voltage is applied, which sets the threshold value when exceeded, relay 41 is turned on. Output signal amplifier 20 (26,32) also goes through inverter 42 to the inverting input of amplifier 43 through inverter 42. There is a set voltage at the non-inverting input of amplifier 43, and relay 44 is connected to the output. In tweeters, opamps can be used. Apparatus of the Invention A device for controlling the distribution of current distribution in two parallel branches of a static converter, in which there are series-connected gates in each branch, connected in pairs by equalizing wires, containing a current transformer whose primary windings are connected counter to the cathode circuits of a supporting pair of gates, The secondary one is connected through the main amplifier and the threshold organ to the executive organ, characterized in that, in order to expand its functionality, it is provided for each pa The valves, besides the reference one, are additional current transformers, an amplifier with a gain twice the amplification factor of the main amplifier, a threshold and actuator, with the primary winding of the additional current transformer, the secondary winding of which is connected to the first additional input an amplifier, the second input of which is connected to the output of an amplifier connected to the previous pair of valves, and the outputs of the amplifiers through additional clauses horny bodies connected with additional executive. Sources of information taken into account in the examination 1. USSR patent in application No. 2082095, cl. H 02 And 7/10, 1973.
    [2]
    2.Patent of the USSR in application 2521262 / 24-07, cl. H 02 H 7/10, 1976.
    : b
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    同族专利:
    公开号 | 公开日
    GB2014806A|1979-08-30|
    DE2807095B1|1978-12-14|
    CA1126820A|1982-06-29|
    FR2417873B1|1981-11-06|
    DE2807095C2|1979-08-16|
    US4228477A|1980-10-14|
    SE7900261L|1979-08-21|
    GB2014806B|1982-03-10|
    FR2417873A1|1979-09-14|
    JPS54122847A|1979-09-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE1121206B|1960-03-24|1962-01-04|Licentia Gmbh|Circuit arrangement for monitoring a rectifier system|
    DE1110744B|1960-04-14|1961-07-13|Bbc Brown Boveri & Cie|Arrangement for monitoring the current flow of semiconductor valves connected in parallel|
    CA933592A|1971-06-16|1973-09-11|Canadian General Electric Company Limited|Cell surveillance monitor for a power converter|
    AT331920B|1973-12-05|1976-08-25|Siemens Ag|MONITORING CIRCUIT FOR A NUMBER OF SIMULTANEOUS FLOW VALVES|
    US4063145A|1975-05-13|1977-12-13|Siemens Aktiengesellschaft|Circuit arrangement for firing controlled, parallel-connected electric valves|US4384248A|1979-06-22|1983-05-17|Hitachi, Ltd.|Method and apparatus for detecting shortcircuit in arm of GTO inverter|
    DE2930034A1|1979-07-24|1981-02-12|Siemens Ag|MONITORING DEVICE FOR THE CONDENSER BATTERY OF A DC FILTER CIRCUIT|
    US4290007A|1979-12-03|1981-09-15|United Systems Corporation|High power and high voltage transistor control circuit|
    US4706159A|1985-03-12|1987-11-10|Pitney Bowes Inc.|Multiple power supply overcurrent protection circuit|
    DE58906285D1|1988-06-29|1994-01-13|Siemens Ag|Device for detecting internal faults in a high-voltage capacitor battery.|
    US5170118A|1991-08-14|1992-12-08|Sundstrand Corporation|Circuit and method for testing inverter drive logic switching patterns|
    CN103336163B|2013-06-18|2015-06-17|中国科学院电工研究所|Converter-valve AC/DC voltage test circuit of flexible high-voltage DC transmission system|
    CN103887768B|2014-04-09|2016-07-06|南京保合太和电力科技有限公司|Excitation system rectifier bridge differential protecting method and system|
    CN104020378B|2014-06-10|2016-11-23|杭州泽天科技有限公司|The detection method of multiple electromagnetic valves and device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19782807095|DE2807095C2|1978-02-20|1978-02-20|Circuit arrangement for monitoring the current maldistribution in two parallel-connected converter branches|
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