• 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:
    An arrangement of an on-load change-over switch of a sequence switch for uninterrupted switching of the regulating coil of a transformer. On-load change-over switching is usually effected with mechanical switch elements, which entails undesirable burn-up of the contacts and contamination with oil. In other known embodiments, on-load change-over switching is achieved using mechanical switching elements and thyristors. The main drawback of these arrangements is the high cost of the control elements, which are prone to failure. According to the invention, the load current is supplied to a common branch line (16) through a lower or upper coil tapping point (11, 12) of a regulating step (13) of a regulating coil and at least two selector contacts (14, 15) and two permanent contacts (9, 10). Change-over switching from the lower to the upper coil tapping point and vice versa is effected by a change-over switch (5) which switches the load current briefly to a discharge circuit (17), arranged between the root connection (6) of the change-over switch and the common branch line. The discharge circuit can comprise, for example, two thyristor circuits (2, 3) whose thyristors (2a, 2b, 3a, 3b) are connected in anti-parallel, one of the transistor circuits being connected in series with a transition resistance.
    公开号:SU1739862A3
    申请号:SU894742765
    申请日:1989-12-22
    公开日:1992-06-07
    发明作者:Зоннтагсбауер Эрнст
    申请人:Элин-Унион Аг Фюр Электрише Индустри (Фирма)；
    IPC主号:
    专利说明:

    at
    Yo
    VJ SA H 00 O GO

    with
    in such a way that the load current is briefly transferred to the unloading circuit 17, which is located between the common contact 6 of the switch 5 and the common terminal 16, One of the contacts 7, 8 of the switch 5 is connected to the junction of the switching contact 14, 15 with a time-closed contact 9, 10. V According to the invention, the discharge circuit consists of a two-position switch 18 and a thyristor connected in series with it.
    This invention relates to electrical engineering.
    A device for switching the load is known with the help of mechanical switching elements and thyristors, in which the load current is supplied through the winding taps of the regulating winding control stage and through switching and durable contacts to the common branch. Instead of the usual two transition resistances in this case, there is one thyristor circuit with opposite thyristors connected in parallel. Both circuits of the thyristor are connected through a separating contact with a common tap.
    The switching process is controlled by a logic circuit. The process proceeds in such a way that the load current is always switched by the thyristors, and, depending on the switching process, is connected either to a long-open contact or switches from a long-open contact to the thyristors.
    The drawbacks of the invention are the high costs of the electronic components necessary for control, as well as their susceptibility to failures; the effect of high voltage on electronic components (there is a danger that the magnetic fields of the transformer windings initiate the erroneous ignition of the thyristors).
    Closest to the present invention is the invention, which describes a circuit for switching loads,
    circuits 2 with anti-parallel thyristors 2a, 2b, and transitional resistance 4 through shunt switch 22 is connected to common terminal 16. One switching contact 20 of two-position switch 18 is directly, and its other switching contact 21 is connected to common contact switch, due to what is achieved entirely 1 CW. f-ly, 3 ils
    moreover, there are two vacuum switches between the common tap and two switching contacts. Moreover, there is an unloading circuit which is located between the common tap, and - by using the switch - one switching contact and is designed so that it can be connected in parallel
    Q one of both vacuum switches.
    The discharge circuit contains a series current-limiting resistance circuit with a semiconductor switch. A bypass is provided for this semiconductor switch with a high impedance circuit to limit current surges that occur. The bypass circuit is connected to the primary winding of the current transducer, the secondary winding of which is connected to the grid-controlled device. The latter contains control links that use the secondary increase in converter current 5
    0
    five
    0
    ka included in the bypass circuit.
    The switching of the taps under load is carried out with the intermediate switching on of the unloading circuit during mutually dependent movements of switching on or off the vacuum switches.
    This device also offers an expensive system for switching the tap of control transformers, in which two vacuum switches are again located between the common tap and the switching contacts. Also in this
    51
    In this case, the discharge circuit between the common tap and the switch is positioned so that the discharge circuit can be connected in parallel to one of both vacuum switches.
    The discharge circuit consists of a series circuit of a semiconductor switch with ohmic resistance, which is connected in parallel with one semiconductor switch. To prevent voltage build-up during switching, a voltage limiting circuit is provided connected in parallel with the semiconductor switch of the series circuit.
    The connecting lines between the two vacuum switches and the common tap, as well as the connecting line between the voltage limiting circuit and the common tap, are connected to the primary winding of one of the three attached current converters ,, The secondary windings of these current converters are connected to one of the three attached devices with a grid control, whose task is to ignite the unloading circuit's semiconductor switches at the true time. By appropriately adjusting the ignition time during the opening and closing times of the vacuum switches, the load current flows through the semiconductor switches, thereby preventing the occurrence of the arc of light.
    The disadvantage of this solution is. The cost of structural elements and their susceptibility to failure.
    The purpose of the invention is to simplify the design and reduce the load on the contacts.
    This problem is solved by the invention. The invention is characterized in that the unloading circuit consists of a two-position switch and a thyristor circuit connected in series with anti-parallel thyristors and a transient resistance through a shunt switch connected to a common terminal, one switching contact of the two-position switch directly and the other switching contact of this

    398626
    The switch is connected to the main connection of the first switch through a transition resistance.
    Structural elements are designed to prevent a light arc when switching from one control stage to another and simultaneously prevent burning of .Q contacts during their long-term use. Thyristors are not loaded at end positions because they are shunted using one or another parallel included- .,. long closed contact. The load on the thyristors due to short-circuit currents is also prevented.
    With a switching time of 2Q of 120 ms, mechanical switching elements used in the case of known load switches can be used, as well as transient resistances, 25 In addition, only one firing device is needed, which is doubled during the same switching process.
    In accordance with the improved design, both long-time closed contacts are made in the form of one next switching contact.
    Due to this, nominally switching Contacts and, 35 moreover, a design as a load switch is easily achieved.
    FIG. Shows a device for switching outlets; 2 and 3-40 corresponding flow diagrams
    The device contains a cascade (steps) 13 of regulating the control winding, the load current of which can be supplied through the lower 11 or higher 12 branches of the winding and che. cut at least two room contacts 14 and 15 and two long - closed contacts 9 and 10 to common terminal 50 16. Switching from the bottom water to a higher tap of the winding or vice versa is carried out with the help of switch 5, and the load current briefly changes to unloading circuit 17 55, which is located between the common contact 6 of the switch 5 and the common terminal 1b From both switching contacts 7 and 8, switch 30
    eleven
    Chat 5 one is connected to the connection of the switching contacts 14 and 15 with long-close contacts 9 and 10.
    The unloading circuit 17 consists of a two-position switch 18 and a thyristor circuit 2 connected in series with it with counter-parallel-thyristors 2a and 2b. the transient resistance 4 is connected via a shunt switch 22 to a common output 16, One switching contact 20 of the two-position switch 18 directly, and the other switching contact 21, through a transitional resistance 4 connectors, to contact 6, switching bodies 5,
    As can be seen from the diagrams of the process flow shown in FIGS. 2 and 3, the times of firing thyristors 2a and 2b are symmetrically shifted.
    This asymmetry in both directions of switching, as well as the switching of the end contact by switching bodies B, is provided mechanically.
    Based on FIGS. 1 and 2, step-by-step switching is described from drive 11 to tap 12 of the step 13 of the regulating winding winding. Shown on the left side are indicated neither in figure 2 correspond to switching bodies or thyristors and contacts in FIG. 1C. Furthermore, 11-12 means the direction of the switch from tap 11 to tap 12. Of the two fields that belong to the thyristor circuit 2, the first field (2) shows the duration of the ignition pulses and the second field (2) shows the duration of the current through the thyristors.
    Steps:
    And - switching contacts 14 and 15 and long-closed contact 9 are closed. A switch 5 connects pin 7 via common contact b to an unloading circuit 17. The unloading circuit 17 is in a non-conductive switching state. The two-position switch 18 connects the switching contact 20 to the common contact 19t. The thyristor circuit 2 is in a non-conducting switching state. Shunt toggle 22 closed. The load current flows through the tapping 11 of the winding of the step 13 of regulating the control winding, and





    0
    five
    0
    five
    862
    eight
    also via the switching contact 14 and the long closed contact 9 to the common terminal 16. The thyristor circuit | 2 is ignited.
    B - permanently closed contact
    9 is open, thyristor circuit 2 accepts a load current.
    C - thyristor circuit 2 is no longer ignited and conducts current only until the next passage through zero. After this, the load current flows through the transient resistance 4 and the shunt switch 22.
    D - switch 18 is open, long contact 10 is closed. The load current, reduced to the magnitude of the equalizing current, flows through the tap 12 of the winding, the switching contact 15 and the long-closed contact
    10 to common pin 16, Equalizing current flows through transient resistance 4 and pin 22.
    E - two-way switch 18 connects the common contact 19 with the switching contact 21. The thyristor circuit 2 is ignited.
    F - shunt switch 22 opens. Equalizing current flows through the thyristor circuit 2.
    The G-thyristor circuit 2 is no longer ignited and conducts a balancing current only until the next passage through zero. After that, the load current flows through the tap 12 of the winding, the switching contact 15 and the long-closed contact 10 to the common tap 16C
    H - switch 5 switches the common contact 6 from the switching contact 7 to the switching terminal - i so g 8.
    I - switch 18 switches from switch contact 21 to switch contact 20. Shunt switch 22 closes. As a result, the discharge circuit is ready for the next stage switching.
    With respect to the unloading circuit of FIG.
    current load on the thyristornuk} circuit 2:
    0
    five
    0
    five
    0
    five
    tu 1b - 20 ms;
    load on thyristor circuit 2:
    U.
    mn
    t. ii.
    where tt
    I, LL
    D uth
    E
    cr
    R
    (i
    t
    load on thyristor dep 2 from the balancing current: t Ed.
    HA - kTG
    load duration by surge current:
    tfl 5 - 15 ms,
    current load duration;
    load current; surge current; thyristor voltage; step voltage; transient resistance; load time by surge current. Based on FIGS. 1 and 3, another option is described for switching from tap 11 to tap 12 of step 13 of the regulation winding control. Steps A to C are equivalent to the steps in the above description of the switching process.
    Next steps:
    D - two-way switch 18 switches common contact 19 from switching contact 20 to switching contact 21. Ignition of thyristor circuit 2 is performed. E - shunt switch 22 opens. Triac circuit 2 receives load current
    F - long closed contact 10 is closed. The load current, reduced to the equalizing current, flows through the tap 12, the switching contact 15 and the long-closed contact 10 to the common terminal 16. The thyristor circuit 2 conducts the balancing current.
    G - thyristor circuit 2 no longer ignites and conducts a balancing current only until the next passage through zero.
    H - switch 5 switches common contact 6 from switching contact 7 to switching contact 8.
    I - dip switch 18 switches from switch contact 21 to switch contact 20. Shunt switch 22 closes. So sa
    7398621П
    My unloading circuit is ready for the next stage switch.
    权利要求:
    Claims (1)
    [1]
    1. A device for switching 4 taps of a transformer control winding under load, comprising
    Q included between the corresponding tap and the common output of the chain according to the number of taps from the series-connected switching contact and the long-closed contact, except
    from that, the switch and the unloading circuit containing a thyristor circuit of anti-parallel-connected thyristors and a transient resistance and connected between the common contact of the switching body and the common terminal, each of the switching contacts of the switch connected to the common point of the switching and durable contactors of the corresponding chain,
    5 characterized in that, in order to simplify the design and reduce the load on the contacts, two-position and shunt switches are introduced into the unloading circuit, while the transient resistance is connected consistently with the shunt switch, the thyristor circuit is connected to the common contact of the dip-switch, the free output of the thyristor circuit connected to the free terminal of the shunt switch and to the common terminal, the free terminal of the transition resistance is connected to the common contact of the first switch and to one switching-off of the switch contacts, the other switching contact is connected to the common terminal and the transition resistance shunt switch i
    2 o Device pop, characterized in that the long-closed contacts are made in the form of a switching contact, common
    The contact of which is connected to the common output, and the switching contacts to the corresponding long-closed contactors.
    0
    five
    0
    five
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1739862A3|1992-06-07|On-load tap changer of transformer regulating winding
    US7355369B2|2008-04-08|On-load transformer tap changing system
    US5604424A|1997-02-18|Electrical changeover switching
    KR101134998B1|2012-04-09|Device for regulating electrical voltage
    US3662253A|1972-05-09|Tap changing system for regulating transformers
    US8289068B2|2012-10-16|Method for switching without any interruption between winding taps on a tap-changing transformer
    US20110133817A1|2011-06-09|Tap switch with semiconductor switching elements
    US3700925A|1972-10-24|Thyristor tap changer for electrical inductive apparatus
    Shuttleworth et al.1996|New tap changing scheme
    US3500170A|1970-03-10|D.c.-a.c. converters
    Cooke et al.1990|Thyristor assisted on-load tap changers for transformers
    US3437913A|1969-04-08|Tapped regulating transformer having thyristor transfer switch means
    US5694034A|1997-12-02|Tap changer for a tapped or stepped transformer
    US6337802B1|2002-01-08|Device for energizing a voltage-source converter
    SE436529B|1984-12-17|Tap changers
    GB936713A|1963-09-11|Improvements in and relating to transformer tap-changing systems
    SU1476576A1|1989-04-30|Device for arc-free switching under load of transformer taps
    Liu et al.2020|Switching strategy of electronic divider for hybrid on-load tap changers based on zero-crossing signal
    RU2032262C1|1995-03-27|Induction-type on-load stepping tap changer "uvar"
    RU181460U1|2018-07-16|A device for balancing voltage in a four-wire high-voltage network
    SU506836A1|1976-03-15|Transformer Voltage Under Voltage Regulator
    SU1051510A1|1983-10-30|Device for regulating a.c. voltage
    ADASUR et al.2017|POWER TRANSFORMER TAP SWITCHING USING SEMICONDUCTOR DEVICES
    SU1251198A1|1986-08-15|Hybrid arcless device
    SU1457129A1|1989-02-07|D.c. to a.c. voltage converter
    同族专利:
    公开号 | 公开日
    EP0375687A1|1990-07-04|
    HU203425B|1991-07-29|
    WO1988010502A1|1988-12-29|
    JP2662434B2|1997-10-15|
    HUT52270A|1990-06-28|
    EP0375687B2|1997-04-02|
    US5006784A|1991-04-09|
    JPH03500224A|1991-01-17|
    BG50510A3|1992-08-14|
    EP0375687B1|1993-05-12|
    ATA160187A|1991-12-15|
    AT400496B|1996-01-25|
    DE3881052D1|1993-06-17|
    AT89433T|1993-05-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    RU2709191C2|2015-04-22|2019-12-17|Машиненфабрик Райнхаузен Гмбх|Switch of load stages, method of actuation of switch of load stages, as well as electric installation with switch of load stages|GB1007496A|1962-11-21|1965-10-13|Electric Construction Co|Improvements relating to transformer tap-changing|
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    AT303208B|1968-07-25|1972-11-10|Elin Union Ag|Circuit arrangement for power switching or load switching or load switching with at least one controllable valve|
    DD72826A1†|1969-02-12|1970-05-05|Diverter switch for transformers and reactors|
    FR2044094A5|1969-05-08|1971-02-19|Comp Generale Electricite|
    JPS507727B1|1969-11-04|1975-03-28|
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    DE2207367C2|1972-02-17|1974-02-28|Reinhausen Maschf Scheubeck|Arrangement to prevent step short circuits in diverter switches of step transformers with anti-parallel connected thyristors|
    DE2210049A1†|1972-03-02|1973-09-06|Transformatoren Union Ag|ARRANGEMENT AND PROCEDURE FOR UNINTERRUPTED LOAD SWITCHING IN STEPPED TRANSFORMERS|
    GB1399528A|1972-06-20|1975-07-02|Krasov A I|Electrical onload tap changing systems|
    DE2327610C3|1973-05-30|1979-01-11|Maschinenfabrik Reinhausen Gebrueder Scheubeck Gmbh & Co Kg, 8400 Regensburg|Diverter switch for step switches of regulating transformers|
    US4081741A|1975-10-29|1978-03-28|Asea Aktiebolag|On-load tap changer|
    US4363060A|1979-12-19|1982-12-07|Siemens-Allis, Inc.|Arcless tap changer for voltage regulator|
    US4301489A|1979-12-19|1981-11-17|Siemens-Allis, Inc.|Arcless tap changer utilizing static switching|
    DE3223892C2|1982-06-26|1990-01-18|Maschinenfabrik Reinhausen Gmbh, 8400 Regensburg, De|
    JPS59125418A|1983-01-07|1984-07-19|Mitsubishi Electric Corp|On-load tap changer|
    DE3304851C2|1983-02-12|1991-01-10|Maschinenfabrik Reinhausen Gmbh, 8400 Regensburg, De|
    SE436529B|1983-05-10|1984-12-17|Asea Ab|Tap changers|
    US4622513A|1984-09-28|1986-11-11|Siemens Energy & Automation, Inc.|Gating of the thyristors in an arcless tap changing regulator|DE3935866A1|1989-10-27|1991-05-02|Reinhausen Maschf Scheubeck|ARRANGEMENT AND METHOD FOR LOAD SWITCHING FOR LOAD SWITCHES OF TAPE SWITCHES|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    AT160187A|AT400496B|1987-06-25|1987-06-25|THYRISTOR LOAD SWITCH|
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