• 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:
    For testing a tap changer (20) of a transformer (5; 6), which is designed to change a transmission ratio of the transformer (5; 6), the following steps are carried out: generating a test signal which corresponds to a winding (1-3; ) of the transformer (5; 6) and the tap changer (20) is supplied. Actuate the on-load tap-changer (20) to change the transmission ratio. Detecting an electrical resistance of the transformer (5; 6) during the step of actuating the tap changer (20) in response to the test signal.
    公开号:AT516004A1
    申请号:T50460/2014
    申请日:2014-07-02
    公开日:2016-01-15
    发明作者:
    申请人:Omicron Electronics Gmbh；
    IPC主号:
    专利说明:

    Method and device for testing a tap changer of a transformer
    The present invention relates to a method and a device for checking a step switch of a transformer, in particular of a power transformer.
    Electrical power transformers, which are used, for example, in power generation, energy transmission, power distribution or industrial applications and designed for outputs greater than 1 MW, often include so-called tap changers in order to adapt the transmission ratio of the respective transformer, for example, to certain load conditions. Tap changer, which also in the operation of the transformer or under load, i. Without interruption of the operation, can be switched, are often referred to as on-load tap changer (OLTC). For this purpose, the winding of the transformer is designed as a so-called step winding, taps or taps of this tap winding are guided to the tap changer, which then switches in the operation of the transformer from a tap to another tap, so as to the transmission ratio of the transformer to change.
    Since the windings of a transformer each represent a large inductance, it is not easy to realize switching between different gear ratios since it is not possible to easily interrupt the current flow through a winding. Therefore, a tap changer is designed so that the current can flow through the winding at any time. Often, for this purpose, the tap changer switches the current flowing through the coil by means of resistors to thereby change the gear ratio. The switching process must be carried out quickly in order to avoid excessive heating of the resistors. Due to the complicated and therefore error-prone mechanism of the tap-changer, a regular check of each tap changer is advisable.
    Therefore, the present invention has the object to improve the verification of a step switch over the prior art.
    According to the invention this object is achieved by a method for testing a step switch of a transformer according to claim 1 and by a Vorrich¬tung for testing a tap changer of a transformer according to claim 9. The dependent claims define preferred and advantageous embodiments of the present invention.
    In the context of the present invention, a method is provided for testing a step switch of a transformer. In this case, the Stufenschal¬ter is designed to change (under load) a transmission ratio of the Transforma¬tors. The method according to the invention comprises the following steps: generating a test signal which is fed to a winding of the transformer and the tap changer. The test signal may be, for example, an electrical current that flows through the winding and the in-line tap changer and is typically between a few amps and about 100 amps. The test signal may also be an electrical voltage which is applied to the winding and / or the tap changer in such a way that an electric current results, which flows through the series connection of the winding and the tap changer. • Actuation of the tap changer, wherein the transmission ratio of the transformer is changed in the operation of the Stufenschal¬ters. • detecting a transient electrical resistance of the transformer during the operation of the tap changer, wherein the electrical resistance value is dependent on the test signal. In particular, at least one measured quantity, for example a current flowing through the winding and the series-connected tap changer and / or a voltage dropping across the winding, is measured to check the tap changer on the basis of the electrical resistance value or more precisely on the basis of a time characteristic of the resistance value the at least one measurand (and therefore the resistance value) changes by the operation of the stepper depending on the generated test signal. This at least one measured variable is either itself the resistance value or comprises one or more measured variables (for example current and voltage), from which the resistance value can be determined. The time profile of the at least one measured variable and thus of the resistance value can be recorded, for example, by detecting the at least one measured variable during a predetermined time interval continuously or at specific times within this time interval (for example 100 ms). Dabeibeginnt the time interval in particular directly before or shortly after the beginning of the operation of the tap changer and ends after the translation ratio has been changed by the tap changer or after the grossest changes in the measured variable have subsided due to the operation of the Stu¬fenschalters or the switching operation.
    On the basis of the transient (ie non-stationary) resistance value, which is detected during the operation of the tap changer, or on the basis of the time course of the resistance value, the decision as to whether or not the pulse switch works correctly can be made much better and easier than it is The prior art is the case. In this case, the detected resistance value and the time profile of the resistance value can in particular be evaluated on the basis of historical data (for example, previously acquired resistance values or previously recorded time profiles of resistance values that are demonstrably working correctly) in order to decide whether the tap changer is currently operating correctly.
    According to a preferred embodiment of the invention, the transformer may be a multi-phase transformer (eg, a three-phase AC transformer). In a multi-phase transformer, a separate tap changer is provided for each phase of the transformer, which is designed to change (under load) a Übersetzungsver¬verhältnis the transformer. For testing the tap changer, a test signal is generated simultaneously for each phase of the transformer. ProPhase this test signal is assigned to a respective phase associated Wind¬lung the transformer and the winding associated Stufenschal¬ter. If the test signals each have one current, for example, a current is simultaneously generated for each phase of the transformer, which current flows through the winding associated with the respective phase and the tap changer associated with the winding, which is in series with the respective winding. For example, when the test signals are each a voltage, for each phase of the transformer, a voltage is simultaneously applied to the winding associated with that phase to thereby generate a current through that winding and the associated step switch. The tap changer are actuated, whereby the transmission ratio is changed with each actuation. The step switches should all be operated simultaneously. During actuation of the step switches, a transient electrical resistance value or a time profile of this resistance value, which changes depending on the test signal during the switching operation, is detected for each winding associated with the respective tap changer. In this case, the detection of the respective resistance value takes place, in particular, again with at least one measured variable, as described above. In the case of a measured variable, this can be an electrical current which flows through one of the windings and the tap changer associated with this winding, lying in series with this winding. Another measurand may be an electrical voltage that drops across one of the windings.
    On the basis of the resistance value detected for the respective phase, it is possible to decide whether the respective tap changer of the polyphase transformer is working correctly. In this case, the resistance value detected for the respective phase can be compared with a corresponding resistance value for a correctly operating step switch.
    The test signals can be generated for each phase so that the test signals have the same magnitude, as a result of which the resistance values detected for different phases are advantageously comparable with one another.
    In a three-phase transformer with star point connection, which preferably has a Y or a Z winding, all three phases can be tested simultaneously. For this purpose, a current can be impressed as the test signal, which is impressed into the winding in two phases (ie at the end of the winding facing away from the star point) and flows out of the winding at one phase (ie at the end remote from the star point) , In addition, if the three currents are equal in magnitude, then a fourth current will also flow out (i.e., it will be pulled off the winding at the end remote from the star point).
    In either a multiphase transformer or a single-phase transformer, the test signal may be a DC signal, i.e., a DC electrical current.
    As at least partially described in advance, the electrical resistance value can be determined on the basis of electrical measured variables. If one measure is the electric current flowing through the respective winding and the tap changer associated with that winding, and if the other measurand is the voltage falling across the respective winding, then the electrical resistance value may vary depending on the voltage and the current (in particular as a quotient of the voltage and the current). This resistance value may be an ohmic resistance value or an equivalent direct current value or an impedance value or alternating current resistance.
    According to the invention, in the case of the at least one measured variable, other electrical quantities, such as e.g. the electric power or the electrical energy which is taken up by the respective winding or emitted by the latter, act. In this case too, it is possible to determine the electrical resistance based on the at least one measured variable.
    According to the invention, it is possible, on the one hand, to automatically evaluate the detected electrical resistance value in order to check the tap changer or to make a decision as to whether the respective tap changer is operating correctly. On the other hand, however, it is also possible according to the invention to output the respective electrical resistance value in order, for example, to let an expert decide on the basis of the output as to whether the respective tap-changer operates correctly.
    In particular, if the detection and / or determination of the respective electrical resistance value comprises detection and / or determination of a temporal progression of the respective electrical resistance value, outputting the respective electrical resistance value advantageously comprises displaying the time profile of the respective electrical resistance value.
    To test the respective tap changer, a plurality of detected time sequences of the electrical resistance value, which are detected and / or determined in the case of a plurality of actuations of the respective tap changer, can be displayed automatically superimposed over time. The representation of the gradients is effected in particular via a display or a screen. However, it is also possible to print out the progressions for their representation on a printer or to display them on other media. The temporally superimposed representation of the courses is understood to mean, in particular, that a temporal end of each of the courses shown is plotted after all the chronological beginnings of the courses shown. The illustrated (temporally superimposed) courses of the electrical resistance values can also be evaluated on the basis of historical data (eg previously detected courses of the resistance value).
    In the temporally superimposed representation of the courses of the respectively detected electrical resistance values, on the one hand there is the possibility of applying the courses as congruently as possible so that, for example, two identical courses are displayed exactly one above the other. Another possibility according to the invention is to apply the gradients (slightly) offset so that, for example, two identical gradients can be distinguished. The gradients can be displayed offset either in the direction of the time axis and / or perpendicular to the time axis.
    In particular, corresponding time segments or the respectively corresponding time interval of the respective course may begin shortly before or shortly after the respective actuation of the tap changer, and after the end of the execution of the switching to a new ratio end. The respective time period of the respective course can be, for example, 100 ms of the respective switching operation.
    The time interval during which the course of the respective resistance value is detected can be chosen so long that the transformer comes into saturation after switching to the new transmission ratio, so that the detected resistance value also encompasses the resistance of the winding.
    The present invention also provides an apparatus for testing a tap changer of a transformer. In this case, the tap-changer is designed to change (under load or during operation) a transmission ratio of the transformer. The device comprises test signal generating means, measuring means and control means. With the help of the test signal generating means and the control means, the device generates a test signal, which is fed to a winding of the transformer and the tap changer. With the aid of the measuring means and the control means, the device is able to detect and / or determine an electrical resistance of the transformer during an operation of the tap changer in dependence on the test signal.
    The advantages of the device according to the invention essentially correspond to the advantages of the method according to the invention, which are carried out in advance in detail, so that a repetition is dispensed with here.
    According to an embodiment of the invention, the transformer may be a polyphase transformer, with a separate tap changer being provided for each phase of the transformer, which is designed to change (under load) a transformation ratio of the transformer. According to this embodiment of the invention, the device is thus configured to test one or more tap changers of a polyphase transformer. In addition, the device is equipped to simultaneously generate a test signal for each phase of the transformer with the aid of the test signal generating means and each of these test signals (ie in each case one of these test signals) of a winding of the transformer associated with the respective phase to supply this winding associated tap changer. The device is capable of detecting, with the aid of the measuring means and the control means for each winding, an electrical resistance value during actuation of the tap changer depending on the test signal.
    The advantages of this embodiment according to the invention correspond in general to the advantages of the corresponding embodiment of the method according to the invention, which are carried out in detail in advance, so that a repetition is omitted here.
    In particular, the device comprises a display and is designed in such a way that the device, with the aid of the control means, represents the resistance value or temporal progressions of the resistance value on this display.
    The output of the electrical resistance, and in particular the graphical representation of time-sequential traces of the electrical resistance value for the respective tap changer, simplifies the interpretation of the detected resistance compared to the prior art. This ultimately also simplifies the testing of the tap changer.
    The present invention can be used in particular for testing on-load tap changers of power transformers. Of course, the present invention is not limited to this preferred field of application, since the invention can also be used, for example, for testing tap changers of transformers which are not considered as power transformers.
    In the following, the present invention will be described in detail with reference to preferred embodiments according to the invention with reference to the figures.
    In Fig. 1, a plurality of time courses of an electric current when Betäti¬gen a tap changer of a transformer are shown.
    In Figs. 2-4, only certain of the time courses shown in Fig. 1 are shown.
    In Fig. 5, the timing of an electric current when operating a tap changer of a transformer are not superimposed in time, but shown in temporal succession.
    In Fig. 6, a transformer with tap changer is shown together with a erfin¬ device according to the invention.
    FIG. 7 shows a polyphase transformer together with a device according to the invention.
    In Fig. 8, a device according to the invention is shown schematically.
    Although an electric current is shown in the following figures by way of example both as a test signal and as a measured variable, it is explicitly pointed out that a voltage can also be applied as a test signal according to the invention and / or that a voltage, an electrical resistance, an impedance are used as the measured variable , a power, an energy, etc. can be set or detected in order to determine an electrical resistance value of the transformer depending on the measured variable.
    In FIG. 1, a plurality of time profiles 41, 42 of an electrical current are shown superimposed over time, wherein each of the courses 41, 42 is detected when a tap changer of a transformer is actuated. The electrical current whose course is detected flows through the winding and the tap changer in series with the winding. For each of the courses, a time segment is shown, which starts at a first time to and ends at a second time ti. In this case, the first time is to shortly after the start of the operation of the tap changer and the second time is tied after the end of the switching operation of the tap changer.
    If, in addition to the electrical current, a voltage across the winding is also detected over time, a time profile of an electrical resistance value can be determined on the basis of a quotient of the voltage and the current. In this case, the time courses of the resistance value could be superimposed in a temporally superimposed manner, as shown in FIG. 1 (and in FIGS. 2 to 4) showing the time profiles of the current.
    In the present case, the winding has eleven taps or taps between which the tap changer can switch over, as will be explained in greater detail with FIG. 6. The courses identified by the reference numeral 41 each show one of ten current courses, which are detected when the step switch is switched upwards, whereby the number of effective windings of the winding is reduced. Similarly, the waveforms labeled with reference numeral 42 each show one of ten current waveforms detected when the tap changer switches down, increasing the number of effective turns of the winding.
    As shown in FIG. 6, there are left-sided or odd-numbered taps 13 and right-sided or even taps 12 of the winding 10. In FIG. 2, only the current waveforms 41, 42 are shown in even-numbered switching operations by suppressing the current waveforms in odd-numbered switching operations by means of filtering. An even-numbered switching operation is present when switching to an even-numbered or right-sided tap 12. In this case, it is possible to switch over to an even-numbered or right-side tap 12 both in the case of a downshift and an upshift. In other words, those indicated by reference numeral 41 in FIG. 2 characterized current curves five even-numbered switching operations during downshifting, while the gekenn¬ with the reference numeral 42 in Fig. 2 current waveforms represent five even-numbered switching operations when upshifting.
    In contrast, in Fig. 3, only the current waveforms 41, 42 are shown in odd-numbered switching operations by suppressing the current waveforms in the case of even-numbered switching operations by means of filtering. An odd-numbered switching operation is present when switching to an odd-numbered or left-sided tap 13 (see FIG. 6). As in the case of the even-numbered switching operations, in the case of the odd-numbered switching operations, it is possible to switch over to an odd-numbered or left-hand tap 13 both during a downshift and during an upshift. In other words, the current waveforms indicated by the reference numeral 41 in FIG. 3 show five odd-numbered switching operations when downshifting, while the current waveforms indicated by the reference numeral 42 in FIG. 3 represent five odd-numbered switching operations upon upshifting.
    In Fig. 4, only the ten current waveforms 41 are shown in even-numbered switching operations, so that the ten current waveforms 42 are not shown in odd-numbered switching operations (see Fig. 1) since they have been filtered out.
    In Fig. 5, the 20 current waveforms 41, 42 of Fig. 1 are shown in temporal juxtaposition. Here, a time (e.g., t3 or t6) at which a current waveform 41, 42 ends corresponds to a timing at which an adjacent current waveform starts. In other words, the current waveforms shown in FIG. 5 are not shown overlaid in time.
    In Fig. 6, a transformer 6 with a tap changer 20 and a erfin¬dungsgemäße device 30 for testing the tap changer 20 are shown.
    The transformer 6 comprises a winding 10 having a plurality of taps or taps 12, 13. The tap changer 20 comprises two Stufenwäh¬ 14.15. In this case, the one tap selector 14 is connected to one of the right-hand or even-numbered taps 12 and the other tap selector 15 is connected to one of the left-side or odd-numbered taps 13. In addition, the tap changer 20 comprises a first terminal 21 and a first resistor 22, which are assigned to the tap selector 15, and a second terminal 24 and a second resistor 23, which are assigned to the tap selector 14. In the state shown in FIG. 6, a current I flows into the winding 10 at the connection 11 and out of the winding 10 at the tap 13, which is in contact with the step selector 15.
    Now, to change the gear ratio of the transformer 6, a switch 25 of the tap changer 20 is connected from the terminal 21 to the terminal 24. At this time, the changeover switch 25 contacts both the first terminal 21 and the first resistor 22 in a first step, so that the current I flows through the first resistor 22 when the changeover switch 25 loses contact with the first terminal 21 in the second step. In the third step, the changeover switch 25 contacts both the first resistor 22 and the second resistor 23, so that the current I via both the first resistor 22 and the second resistor 23 and thus both the stage selector 15 and the corresponding tap 13 as well via the tap selector 14 and the corresponding taps 12 flows. When the changeover switch 25 is further switched, the changeover switch 25 in the fourth step loses contact with the first resistor 22 so that the current I in the fourth step flows only through the second resistor 23 and the tap selector 14 and the corresponding tap 12. When the change-over switch 25 is switched further, the switch 25 contacts the second terminal 24 in the fifth step, so that the second resistor 23 is quasi-short-circuited. The current I flows through the second terminal 24 and the tap selector 14 and the associated tap 12, so that the transmission ratio of the transformer 6 changes accordingly. When the change-over switch 25 is further switched, the change-over switch 25 in the sixth and final step loses contact with the second resistor 23, whereby the switching operation or the operation of the stepping switch 20 for changing the gear ratio of the transformer 6 is finally completed.
    Once the tap selector 15 is de-energized (ie with the fourth step), the tap selector can be connected to another left-sided or unge¬ radiate tap 13. In order to change the transmission ratio of the transformer 6 again, the changeover switch 25 is switched from the second terminal 24 to the first terminal 21 in a similar manner as described above.
    For testing or for testing the tap changer 20, the device 30 according to the invention, which comprises a current source 31 and an ammeter 32, exists. With the aid of the current source 31, the current I is generated which flows through the winding 10 and the tap changer 20 connected in series with the winding 10. In particular, a time profile of the current I flowing through the winding 10 and the tap changer 20 is detected during the switching of the step switch 20 with a corresponding measuring device 9 (see FIG. 8) of the device 30 according to the invention.
    If the measuring device 9 (see FIG. 8) is additionally designed to detect a time profile of the voltage drop across the winding 10, the time profile of the electrical resistance value of the winding 10 can be determined by the controller 7 (see FIG. 8) of the device 30 by dividing at each instant the voltage detected at that time by the current detected at that time. The device 30 according to the invention is then able to display temporal resistance value profiles, which were detected and determined during the switching operations of the tap changer 20, superimposed over time.
    In Fig. 7, a polyphase transformer 5 is shown, which comprises three phases each having a winding 1-3 in Y-connection. In this case, each phase 1-3 has a tap changer 20 (not shown in Fig. 7) for changing the gear ratio of the transformer 5 in the same manner as described above with reference to Fig. 6.
    To test the tap changer, the device 30 according to the invention generates a first direct current h, which is supplied to the end of the first winding 1 facing away from the star point 4, and a second direct current h, which firstly faces away from the star point 4 end of the third
    Winding 3 deducted and on the other hand the star point 4 opposite end of the second winding 2 is supplied. It can be seen that the first direct current also flows from the neutral point 4 to the device 30. In other words, the test signals or direct currents U, I2 supplied to each winding 1-3 have the same amount.
    The timings of the resistance values of the three windings 1-3 are detected while the tap changers are multi-switched to change the gear ratio of the multi-phase transformer 5. Per Stu¬fenschalter several of the detected or determined Widerstandwert¬ courses are shown overlaid in time to check the correct operation of the tap-changer.
    FIG. 8 schematically shows a further embodiment of the device 30 according to the invention. The device 30 comprises in addition to a current source 31, which corresponds to the test signal generating means, a controller 7, a display 8 and measuring means 9 with which a time profile of the electrical resistance value can be detected or determined. On the display 8, the detected or determined time profiles of the resistance value are superimposed over time.
    REFERENCE LIST 1-3 Winding 4 Star point 5 Three-phase AC current transformer 6 Transformer 7 Control 8 Display 9 Measuring device 10 Winding 14, 15 Step selector 12,13 Step 20 Tap changer 11,21,24 Connection 22,23 Resistor 30 Device 31 Power source 32 Ammeters 41 Curr Downshift 42 Upstream current waveform I, h, l2 DC t time tx time
    权利要求:
    Claims (12)
    [1]
    A method of testing a tap changer (20) of a transformer (5; 6), wherein the tap changer (20) is configured to change a gear ratio of the transformer (5; 6), the method comprising the steps of: Generating a test signal supplied to a winding (1-3; 10) of the transformer (5; 6) and the tap changer (20), operating the tap changer (20) to change the gear ratio, and detecting an electric resistance value of the transformer (5 , 6) during the step of actuating the tap changer (20) in response to the test signal.
    [2]
    2. The method according to claim 1, characterized in that the transformer is a polyphase transformer (5), that for each phase of the transformer (5) a separate tap changer (20) is provided, which is configured to a Übersetzungsver¬verhältnis of Transforming transformer (5) to be generated simultaneously that in each case a test signal for each phase of the Transforma¬tors (5), which associated with the respective phase winding (1-3) of the transformer (5) and the winding (1-3) is supplied to the next stage switch (20) that the tap changer (20) are operated to change the Übersetzungsver¬verhältnis, and that in each case an electrical resistance value for each winding (1-3) during the step of actuating the tap changer (20 ) is detected.
    [3]
    3. The method according to claim 2, characterized in that the test signals for each phase of the amount equal to be generated.
    [4]
    4. The method according to any one of the preceding claims, characterized in that the test signal is a DC signal.
    [5]
    A method according to any one of the preceding claims, characterized in that detecting the respective electrical resistance value comprises measuring a current (I; h; b) through the respective winding (1-3; 10) and measuring a voltage applied to the respective winding (1-3; 10) as well as determining the electrical resistance value based on a quotient of the voltage and the current (I; h; l2).
    [6]
    6. The method according to any one of the preceding claims, characterized in that the electrical resistance value is a DC resistance value or an AC resistance value.
    [7]
    7. The method according to any one of the preceding claims, characterized in that the method comprises outputting the respective electrical resistance value.
    [8]
    8. The method according to claim 7, wherein detecting the respective electrical resistance value comprises detecting a profile of the respective electrical resistance value over the time (t), and outputting the respective electrical resistance value representing a variation of the respective electrical resistance value over the Time (t) includes.
    [9]
    9. An apparatus for testing a tap changer (20) of a transformer (5; 6), wherein the tap changer (20) is configured to change a gear ratio of the transformer (5; 6), the apparatus (30) including test signal generating means (30). 31), measuring means (9) and control means (7), wherein the device (30) is designed to use the test signal generating means (31) to generate a test signal of a winding (10) of the transformer (5; 6) and And wherein the device (30) is designed to ab¬ by means of the measuring means (9) and the control means (7) an electrical resistance of the Trans¬formators (5; 6) during actuation of the tap changer (20) dependent on the test signal.
    [10]
    10. The device according to claim 9, characterized in that the transformer is a polyphase transformer (5), that for each phase of the transformer (5) a separate tap changer (20) is provided, which is configured to a Übersetzungsver¬verhältnis of Transformers (5) to change that the device (30) is designed to generate by means of the test signal generating means (31) at the same time in each case a test signal for each phase of the transformer (5) and one of the respective phase zu¬geordneten winding (1-) 3) of the transformer (5) and the Wick¬lung (1-3) associated tap changer (20) supply, and that the device (30) is configured to by means of the measuring means (9) and the control means (7) each have an electric To detect resistance value for each winding (1-3) of operation of the tap changer (20) depending on the test signal.
    [11]
    Device according to claim 9 or 10, characterized in that the device (30) comprises a display (8), and in that the device (30) is arranged such that the control means (7) represent each resistance value on the display (8) ,
    [12]
    12. Device according to one of claims 9-11, characterized in that the device (30) for carrying out the method according to one of claims 1-8 is configured.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50460/2014A|AT516004B1|2014-07-02|2014-07-02|Method and device for testing a tap changer of a transformer|ATA50460/2014A| AT516004B1|2014-07-02|2014-07-02|Method and device for testing a tap changer of a transformer|
    CA2947094A| CA2947094C|2014-07-02|2015-06-29|Method and device for testing a tap changer of a transformer|
    MX2016015596A| MX357248B|2014-07-02|2015-06-29|Method and device for testing a tap changer of a transformer.|
    CN201580024523.2A| CN106415290B|2014-07-02|2015-06-29|Method and device for testing a tap changer of a transformer|
    EP15732673.7A| EP3164725B1|2014-07-02|2015-06-29|Method and device for testing a tap changer of a transformer|
    PCT/EP2015/064713| WO2016001150A1|2014-07-02|2015-06-29|Method and device for testing a tap changer of a transformer|
    AU2015282647A| AU2015282647B2|2014-07-02|2015-06-29|Method and device for testing a tap changer of a transformer|
    KR1020167033235A| KR20160147966A|2014-07-02|2015-06-29|Method and device for testing a tap changer of a transformer|
    RU2016145678A| RU2657326C1|2014-07-02|2015-06-29|Method and device for testing a load tap changer of a transformer|
    PL15732673T| PL3164725T3|2014-07-02|2015-06-29|Method and device for testing a tap changer of a transformer|
    ES15732673T| ES2874876T3|2014-07-02|2015-06-29|Procedure and device for checking a stepped contact switch of a transformer|
    ZA2016/08245A| ZA201608245B|2014-07-02|2016-11-29|Method and device for testing a tap changer of a transformer|
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