• 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:
    Static changer device for load sockets for transformers with discontinuous regulation windings. A load tap changer device based on static switches for applications requiring dynamic voltage regulation is described in this document. The changer of the invention is equipped with a central control unit that determines the optimum operating setpoint based on the information supplied by the local control units associated with each of the phases. For this, the local control units have a series of voltage and intensity sensors linked to them that determine the operating status of the changer. Additionally, these local control units actuate the control signals of the static switches to select the optimum socket determined by the central controller. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2734601A1
    申请号:ES201830549
    申请日:2018-06-06
    公开日:2019-12-10
    发明作者:Expósito Antonio Gómez；Villarejo Manuel Barragán；López Francisco De Paula García；Ortega José María Maza
    申请人:Universidad de Sevilla；
    IPC主号:
    专利说明:

    [0001]
    [0002]
    [0003]
    [0004] OBJECT OF THE INVENTION
    [0005]
    [0006] The object of the invention is framed in the technical field of electricity, more specifically the proposed invention is applied in the area of alternating current power electrical systems and, particularly, in the activities of generation, transport and distribution of electrical energy .
    [0007]
    [0008] The proposed invention is directed to transformers, specifically to a specific topology of a load tap changer based on static switches for applications that require dynamic voltage regulation, such as:
    [0009]
    [0010] • Transformers of power generation, transportation and distribution networks.
    [0011] • Photovoltaic inverters connected to the power grid.
    [0012] • Investors associated with energy storage devices connected to the power grid.
    [0013] • Wind turbines.
    [0014]
    [0015] BACKGROUND OF THE INVENTION
    [0016]
    [0017] Without a doubt, the transformer is one of the key parts of current electrical systems because it allows adapting the voltage levels between the different parts of the electrical system in an efficient and safe way. Most of the transformers in the mains are equipped with tap-changers that, by modifying the number of turns of the primary winding, allow the value of the secondary voltage to be adjusted within a range around the nominal voltage. In this sense, there are two technologies of tap changers: vacuum and load. The former can only be operated with the transformer disconnected from the network. However, the seconds can be operated when the transformer is in operation allowing a dynamic regulation of the secondary voltage before variations of the primary voltage and / or the load. The proposed invention It consists of a specific topology of load tap-changer based on static switches for applications that require dynamic voltage regulation, among which are:
    [0018] • Transformers of power generation, transportation and distribution networks.
    [0019] • Photovoltaic inverters connected to the power grid.
    [0020] • Investors associated with energy storage devices connected to the power grid.
    [0021] • Wind turbines.
    [0022]
    [0023] The current operation of the electrical power systems requires that the voltages of the network nodes remain within the regulatory limits regardless of the state of charge. To this end, there are different regulation mechanisms, the transformer with tap changer being one of them. Basically, a transformer has several electrically insulated windings that are magnetically coupled so that the relationship between the voltages of the windings, known by the transformation ratio, is a function of their winding ratio. The purpose of the tap changer is to maintain the voltage of one of the windings regardless of the voltage of the other and the state of charge of the transformer. For this, the winding in which the changer is installed is divided into two: main winding and regulation winding. The first contains the bulk of windings of the winding while the second is formed by a set of coils with a number of turns in relation to the main and which are electrically accessible. In this way, depending on the electrical connection selected in the regulation winding, the total number of turns of the winding can be modified and, therefore, the transformer transformation ratio.
    [0024]
    [0025] The process of modifying the number of turns is called switching, there are two basic ways of carrying it out: on load and on empty. In the first case, the change of the number of turns is carried out with the transformer in service for which an electromechanical switch characterized by being a bulky, complex and expensive device is normally used. Due to these characteristics, the tap-on-load changers are used in applications where it is not possible to interrupt the service to regulate the voltage, for example in high voltage (AT) transformers at medium voltage (MT). In the second case, the change of turns is done with the transformer outside service, that is, no charge. Technologically, the vacuum tap changer is a very simple and low-cost device, so it is usually installed in medium voltage (MT) transformers at low voltage (BT). The high number of such transformers in the distribution networks makes it impossible to make investments in changers under load, opting for the option of empty changer. These allow you to select the most appropriate outlet based on the average primary voltage, in order to keep the BT voltage within the regulatory limits. However, this technology does not allow to dynamically control the BT voltage depending on the variations of the MT voltage or the load of the transformer.
    [0026]
    [0027] At present, with the massive incorporation of renewable generation, the problem of voltage regulation in electrical networks is more complex. On the one hand, the voltage variations in the network increase because the primary energy source of the renewable generation (wind and photovoltaic for example) is not controlled. On the other hand, and also associated with the variability of primary energy resources, the dynamics associated with voltage variations are becoming faster. As a consequence, the electric power system needs a greater number of resources to control the voltages whose performance is very fast. In this sense, current tap changer technologies, whether empty or charging based on electromechanical switches, do not respond to the current existing requirements of the electrical system.
    [0028]
    [0029] A technological option to solve this problem is to replace the traditional electromechanical changer with a static device based on power electronics whose performance times are very short. However, the use of tap changers based on power electronics is not new, there are previous patents in this regard:
    [0030] • US 5969511. PGJM Asselman et al. 10/19/1999. Method and device for continuous adjustment and regulation of transformer turns ratio and transformer provided with such device.
    [0031] • ES 2274684. D. Monroy. 5/16/2007. Socket changer for medium / low voltage transformers.
    [0032] • US 3195038 (A). J. Fry. 7/13/1965. Voltage or current regulator apparatus.
    [0033] • US 3700925 (A). P. Wood. 10/24/1972. Thyristor tap changer for electrical inductive apparatus.
    [0034] • US 4220411. J. Rosa. 2/9/1980. Thyristor tap changer for electrical inductive apparatus.
    [0035]
    [0036] DESCRIPTION OF THE INVENTION
    [0037]
    [0038] The object of the present invention is directed to a load tap changer based on power electronics with a symmetrical arrangement of static switches, sensors for monitoring and control as well as a passive trigger device that ensures its operation in case of power failures. control signals; being applicable to transformers that have at least one regulation winding, in addition to the main windings, electrically discontinuous, that is, open at least at one point. In this way, the regulating winding is divided into at least two electrically insulated semi-windings formed by a set of coils whose terminals are electrically accessible.
    [0039]
    [0040] A terminal of a static switch based on a power electronics device is connected to each of the terminals of the regulating semi-windings, which are electrically accessible. There are, therefore, the same number of static switches as accessible terminals of the regulating half-winding and equal to the number of semi-winding regulation coils plus one. The other terminals of the static switches are connected to each other forming at least two common points, one for each of the electrically isolated semi-windings. These common points join together through an electrical connection.
    [0041]
    [0042] The set is completed with a series of voltage and intensity sensors, required for monitoring and control of the device, arranged in specific locations. Thus, the intensity measurement is carried out in the electrical connection between the common points mentioned above. Similarly, a voltage sensor is located in each regulation half-winding between an electrically accessible terminal and the common point. With the voltage information provided by the voltage sensors, you can confirm the outlet that is in operation, as well as estimate the secondary voltage of the transformer.
    [0043]
    [0044] The static switch used in the invention can be formed by two IGBTs in antiseries with their respective diodes in antiparallel, or an IGBT with four diodes or two thyristors in antiparallel. If necessary, a snubber can be included to reduce the overvoltages in the switching instants of the static switches.
    [0045] Said static switches are controlled by the corresponding trip signals calculated by a control system, which determines which is the most appropriate socket at each moment depending on the operating conditions and the setpoints. In the case of multi-phase applications, this control system has the following hierarchical structure:
    [0046] • Local controller associated to each of the transformer phases. It is responsible for providing the appropriate trip signals to the static switches depending on the central controller setpoint. Additionally, it measures the operation variables of the changer (voltage, intensity, temperature and / or any other parameter) required by the centralized controller.
    [0047] • Centralized controller responsible for determining which is the appropriate regulation socket in each of the phases based on the operation setpoint selected by the user and the different operation variables sent by each of the local controllers. The central controller, having all the information of the phases, can determine the most appropriate operating instructions at all times to optimize the overall operation of the application.
    [0048]
    [0049] The communication between local controllers and centralized control is done through optical or wireless means to provide adequate galvanic isolation. In the case of single-phase applications, local and centralized controllers are embedded within a single control device.
    [0050]
    [0051] Finally, and to prevent the circuit from being opened in the event of a failure of the control signals acting on the static switches, a passive trip device is incorporated into one of the static switches associated with each semi-winding so that it is guaranteed that, at all times, even in case of failure of control signals, the circuit is closed.
    [0052]
    [0053] DESCRIPTION OF THE DRAWINGS
    [0054]
    [0055] To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical implementation thereof, a set of drawings is attached as an integral part of said description. where, for illustrative and non-limiting purposes, the following has been represented:
    [0056] Figures 1a and 1b.- Shows a view of respective transformers equipped with electrically discontinuous regulation windings, that is to say with at least one opening point; where in figure 1a a single-phase transformer or a phase of a three-phase star connection is represented while in figure 1b a phase of a transformer with the three-phase triangle connection is represented.
    [0057]
    [0058] Figure 2.- Shows a topology of an MT / BT tap changer applying the state of the art.
    [0059]
    [0060] Figure 3.- Shows a diagram showing the proposed topology of a MT / BT tap changer.
    [0061]
    [0062] Figures 4a-4c.- They show respective diagrams representing (4a) Equivalent scheme of the closed static switch (correct control signals). (4b) Equivalent scheme of the static open switch (control signal failure). (4c) Static switch voltage and intensity in operation with correct control signals and with control signal failure.
    [0063]
    [0064] Figures 5a-5b.- They show: (5a) A scheme of components of the passive firing device. (5b) A graph showing the operation of the passive firing device.
    [0065]
    [0066] PREFERRED EMBODIMENT OF THE INVENTION
    [0067]
    [0068] The invention is applicable to transformers equipped with electrically discontinuous regulating windings, that is to say with at least one opening point like those shown in figure 1. In figure 1a a single-phase transformer or a phase of a three-phase star connection is shown while in figure 1b a phase of a transformer with the three-phase triangle connection is shown. Said transformers comprise a main winding (30 in Figure 1a; 30a and 30b in Figure 1b) and an electrically discontinuous regulation winding open at a point such that it is divided into an upper semi-winding formed by the coils (32, 34 ) and lower semi-winding formed by the coils (36, 38). Each of the regulation semi-windings consists of n = 2 regulation coils. The terminals of the upper half-winding (42, 43 and 44) and the lower half-winding (45, 46 and 47) are electrically accessible, both being isolated from each other as terminals 44 and 45 are not electrically connected.
    [0069] Figure 3 shows the embodiment of a changer based on static switches object of this invention on the transformer shown in Figure 1b. The nominal voltage of the main winding (30a, 30b) is Up-Ur while the nominal voltage of the regulating windings (32, 34, 36, 38) is Ur. A first set of static switches (61a, 62a, 63a ) are connected to the accessible terminals of the upper half-winding (42, 43, 44) of the regulating winding. The free terminals of said first set of static switches (61a, 62a, 63a), in turn are connected to a first common point (48a). Similarly, a second set of static switches (61b, 62b, 63b) are connected to the accessible terminals of the lower half-winding (45, 46, 47) of the regulating winding, and their free terminals are connected to a second common point ( 48b). The common points (48a, 48b) are electrically joined together and the intensity circulating in said electrical junction is measured through the corresponding intensity sensor (90). The number of static switches (61a, 62a, 63a, 61b, 62b, 63b) in this preferred embodiment is equal to 2 (n + 1) = 6.
    [0070]
    [0071] Proper operation of static switches allows you to select between five primary voltage levels: static switches (61a, 63b) closed Up-2Ur; static switches (62a, 63b) closed Up-Ur; static switches (62a, 62b) closed Up; static switches (63a, 62b) closed Up + Ur; static switches (63a, 61b) closed Up + 2Ur. Table 1 shows the effective voltages to which the different static switches are subjected according to the selected socket. As an example, if the socket corresponding to the Up-Ur voltage level is selected, the static switches (62a, 63b) must be closed, the voltage of said switches being zero. The voltages of the other switches are easily calculated by applying Kirchhoff's second law and taking into account that the regulation coils are identical to each other. In this way, it is possible to determine the maximum effective voltage to which each switch could be exposed, which is decisive for its dimensioning purposes. Note that the maximum voltages of the static switches are in the range 2Ur (switches (61a, 63a, 61b, 63b)) and Ur (switches (62a, 62b)). On the other hand, and taking into account that the maximum current without overload that can circulate through the static switches is the nominal current of the winding, In, the maximum power associated with the changer, calculated as the sum of the power of each of the switches, It is for this specific case: 10UrIn.
    [0072] Table 1. Static changer object of the invention: Effective voltages depending on the selected outlet.
    [0073]
    [0074]
    [0075]
    [0076]
    [0077] This result can be extrapolated to the case of a transformer with a regulation winding with an opening point so that it is divided into two semi-windings of n regulation coils each with an effective nominal voltage Ur. In this case, the maximum voltage effective of the static switches would be nUr and the total maximum power associated with the changer would be (0.75n2 + n) UrIn in case of n even and (0.75n2 + n + 0.25) UrIn for n odd.
    [0078]
    [0079] The proposed invention provides advantages compared to the state of the art of the tap changer presented in Figure 2. Again, it is possible to select five possible primary voltage levels depending on the static switch that closes: (101) closed Up-2Ur ; (103) closed Up-Ur; (105) closed Up; (107) closed Up + Ur; (109) closed Up + 2Ur.
    [0080]
    [0081] The number of static switches (101, 103, 105, 107, 109) in this configuration is equal to the number of regulation coils plus one (2n + 1, five in the configuration shown in Figure 2). Table 2 shows the effective voltages to which the different static switches are subjected depending on the selected socket. As an example, if the socket corresponding to the Up-Ur voltage level is selected, the static switch (103) must be closed, the voltage of said switch being zero. The voltages of the other switches are easily calculated by applying Kirchhoff's second law and taking into account that the regulation coils are identical to each other. In this way, it is possible to determine the maximum effective voltage to which each switch could be exposed in normal operation, which is decisive for its dimensioning purposes. Notice that the maximum voltages of the static switches (101, 103, 105, 107, 109) are in the range 4Ur (switches (101) and (109)) and 2Ur (switch (105)). On the other hand, and taking into account that the maximum current without overload that can circulate through the static switches (101, 103, 105, 107, 109) is the nominal current of the winding, In, the maximum power associated with the changer, calculated as sum of the power of each of the static switches (61a, 62a, 63a, 61b, 62b, 63b), is for this specific case: 16UrIn.
    [0082]
    [0083] Table 2. Static changer according to the state of the art: Effective voltages depending on the selected outlet.
    [0084]
    [0085]
    [0086]
    [0087]
    [0088] This result can be extrapolated to the case of two half-regulators with n coils, each with an effective nominal voltage Ur. In this case, the maximum effective voltage of the static switches (101, 103, 105, 107, 109) would be 2nUr and the total maximum power associated with the changer (3n2 + 2n) UrIn.
    [0089]
    [0090] Therefore, by comparing the topology presented in the invention with that corresponding to the state of the art through tables 1 and 2, it is possible to affirm that, although the invention uses a greater number of static switches, both the maximum Voltage as the maximum total power associated with such switches are lower. As a consequence, the proposed invention has advantages in relation to the state of the art since it reduces the cost, dimensions and weight. Additionally, it is important to show that certain voltage levels can be obtained with different combinations of static switches (61a, 62a, 63a, 61b, 62b, 63b). This redundancy gives the system some degree of fault tolerance.
    [0091]
    [0092] In relation to the intensity sensing necessary for the monitoring and control of the device, only one intensity sensor (90) represented in this assembly is necessary in Figure 3. This fact has advantages with respect to the state of the art, since as can be seen in Figure 2, at least three intensity sensors (90, 91, 92) would be necessary to monitor the intensity flowing through the device.
    [0093]
    [0094] Additionally, the invention incorporates voltage sensors (80a, 80b) that measure the voltage of static switches that occupy the same relative position in each of the semi-windings, for example and in view of Figure 3 in the static switches (63a, 63b ). In this sense, the voltage measurement could also be located by measuring the voltage of the static switches (61a, 61b). The information provided by the sensors (90, 80a, 80b) is measured by a local control unit (70) which, in turn, sends it to the central controller (100). Said central controller (100) receives this information from the local controllers (70) associated with the different phases and determines the most appropriate take for each of them based on the operating parameters and the operating instructions. Once the sockets for each of the phases have been calculated by the central controller (100), it is sent to the respective local controllers (70) that determine the static switches (61a, 62a, 63a, 61b, 62b, 63b) that must be operated by operating the respective control signals (71a, 72a, 73a, 71b, 72b, 73b).
    [0095]
    [0096] Communication between the local control unit (70) and the central controller (100) is preferably carried out by means of optical or wireless means (95) to guarantee galvanic isolation of the tap-changer. With the voltage information provided by the voltage sensors (80a, 80b) it is possible:
    [0097] • Confirm the shot that is selected taking into account Table 1.
    [0098] • Determine the secondary voltage through an indirect measurement of the regulation winding voltage and the socket that is selected.
    [0099]
    [0100] The object of the invention is complemented by a passive trip device (66a and 66b) for each of the semi-windings. The purpose of said device is to close one of the static switches (61a, 62a, 63a, 61b, 62b, 63b) for each of the regulating semi-windings in case of failure of the respective control signals (71a, 72a , 73a, 71b, 72b, 73b). One of the static switches (61a, 62a, 63a, 61b, 62b, 63b) in operation and under normal operating conditions behaves practically as a short circuit (zero impedance), as can be seen in Figure 4a, so that its voltage and intensity are as shown in the left part of Figure 4c. However, if for some reason the closing of said switch does not occur, its equivalent impedance is that of the associated snubber , as shown in Figure 5b, so that the Circulation of an intensity will cause an overvoltage as shown in the right part of Figure 5b. For this reason, the passive trip device (66a, 66b) acts when a certain instantaneous voltage value of the static switches is reached, for which it is essential to take into account the effective voltage values under normal operating conditions shown in the Table 1. The performance of the device must be higher than the peak value corresponding to the maximum effective values shown in Table 2 plus a certain safety margin that takes into account the possible variations in the network voltage.
    [0101]
    [0102] The physical embodiment of the passive firing device (66a, 66b) is based on the scheme shown in Figure 5a. Said passive trip device (66a, 66b) is formed by a trip circuit (68b) that is fed from a non-linear impedance (67b) whose value is variable depending on the voltage: infinite in case the voltage is lower to a threshold value and zero otherwise. Thus, if the trip signal (72b) from the control system (70) is correct, the voltage at the static switch is zero and the passive trip device has no power, so the trip signal (74b) does not is generated. However, if under any circumstances the trip signal (72b) is interrupted, the voltage in the static switch would begin to increase due to the current flow through the snubber, as shown in the right part of Figure 4c. At the moment when said voltage exceeds the threshold value of the non-linear impedance (67b), the trip circuit power is produced and, consequently, the trip signal (74b) that activates the static switch is generated. This operation is explained in detail in Figure 5b.
    [0103]
    [0104] It is necessary to have a passive trip device for each set of static switches associated with each regulation half-winding. The optimal location of the passive device is in that static switch of the semi-winding that is subjected to the lowest maximum effective voltage in normal operation. Thus, in Figure 3 said passive trip devices (66a, 66b) are installed on the specific static switches (62a, 62b). The location on these specific static switches (62a, 62b) achieves:
    [0105] • Detect the overvoltage in the shortest possible time, because the voltage that must be reached for the passive method to act is reduced compared to the location of the remaining static switches in others (61a, 63a, 61b, 63b).
    [0106] • Improve the waveform of the intensity when the control signal of the static switches fails, since the percentage of conduction of them in the cycle network is higher when the operating voltage of the passive firing method is reached in less time.
    [0107] Avoid oversizing by voltage of the remaining static switches (61a, 63a, 61b, 63b) because when the passive trip acts, the voltage to which these static switches are subjected (61a, 63a, 61b, 63b) is less than the maximum They support under normal operating conditions. The installation in any other static switch would have associated the oversizing of the switches of lower maximum effective voltage, because these would be subjected to higher voltage than in normal operation in case of failure of the control signals.
    权利要求:
    Claims (6)
    [1]
    1. Socket changer device for a transformer comprising:
    • an electrically discontinuous regulation winding open at least one point in such a way that the regulation winding is divided into at least one upper semi-winding and lower electrically insulated winding respectively comprising n regulation coils each provided with electrically accessible electrical terminals , Y
    • a main winding
    the tap changer device being characterized in that it comprises, for each phase of the transformer:
    • a set of first static switches (61a, 62a, 63a) respectively connected to the accessible terminals of the upper half-winding (42, 43, 44) of the regulating winding, being free terminals of said first static switches (61a, 62a, 63a ) connected to a first common point (48a),
    • a set of second static switches (61b, 62b, 63b) respectively connected to the accessible terminals of the lower half-winding (45, 46, 47) of the regulating winding, being free terminals of said first static switches (61b, 62b, 63b ) connected to a second common point (48b),
    • an electrical connection of the common points (48a, 48b) with measurement of the current flowing through it through the corresponding intensity sensor (90),
    • a local control unit (70) for each phase of the transformer that provides the trip signals (71a, 72a, 73a, 71b, 72b, 73b) for static switches (61a, 62a, 63a, 61b, 62b, 63b), and
    • a single central control unit (100) that supervises and controls the set of local control units (70) associated with the phases, which determines for each of them the most appropriate take on the basis of operating parameters and operation setpoint .
    where the number of static switches (61a, 62a, 63a, 61b, 62b, 63b) is equal to the number of electrical terminals of the regulating winding which, in turn, is equal to twice the sum of the regulation coils plus one 2 (n + 1).
    [2]
    2. A tap-changer device for a transformer according to claim 1, characterized in that it additionally comprises at least two voltage sensors (80a, 80b) located in two static switches that occupy the same relative position in each of the regulating semi-windings.
    [3]
    3. A tap-changer device for a transformer according to claim 1 or 2, characterized in that it additionally comprises at least one intensity sensor (90) located between the common points (48a, 48b).
    [4]
    4. A tap-changer device for a transformer according to any one of the preceding claims, characterized in that it additionally comprises passive trip devices (66a, 66b) that act respectively in case of failure of the control signals (71a, 72a, 73a) operating the static switches (61a, 62a, 63a) and (71b, 72b, 73b) operating the static switches (61b, 62b, 63b).
    [5]
    5. A tap-changer for a transformer according to claim 4, characterized in that the static switch on which the passive trip device is installed is the one with the lowest maximum effective voltage in normal operation.
    [6]
    6. A tap-changer device for a transformer according to any one of claims 2 to 5, characterized in that it additionally comprises a control unit (70) configured to collect the information captured by the intensity sensor (90) and the voltage sensors ( 80a, 80b).
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    同族专利:
    公开号 | 公开日
    EP3780038A1|2021-02-17|
    WO2019234271A1|2019-12-12|
    EP3780038A4|2022-01-26|
    ES2734601B2|2020-07-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2006087401A1|2005-02-15|2006-08-24|Universidad De Sevilla|Tap changer for medium-/low-voltage transformers|
    NL278413A|1961-05-15|
    US3700925A|1971-03-29|1972-10-24|Westinghouse Electric Corp|Thyristor tap changer for electrical inductive apparatus|
    US4220411A|1978-08-14|1980-09-02|The United States Of America As Represented By The Secretary Of The Navy|Fiber optic light launching assembly|
    NL1000914C2|1995-08-01|1997-02-04|Geb Zuid Holland West Nv|Method and device for continuous adjustment and control of a transformer conversion ratio, as well as a transformer provided with such a device.|
    CN103229413A|2010-12-17|2013-07-31|赖茵豪森机械制造公司|Tap changer|
    BR112017011004A2|2014-11-25|2018-02-14|Hai Wang|on-load voltage regulation bypass switch for transformer and switch control method|
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201830549A|ES2734601B2|2018-06-06|2018-06-06|STATIC CHANGING DEVICE FOR CHARGING INPUTS FOR TRANSFORMERS WITH DISCONTINUOUS REGULATION WINDINGS|ES201830549A| ES2734601B2|2018-06-06|2018-06-06|STATIC CHANGING DEVICE FOR CHARGING INPUTS FOR TRANSFORMERS WITH DISCONTINUOUS REGULATION WINDINGS|
    PCT/ES2019/070363| WO2019234271A1|2018-06-06|2019-05-30|Static on-load tap changer for transformers with discontinuous regulation windings|
    EP19814374.5A| EP3780038A4|2018-06-06|2019-05-30|Static on-load tap changer for transformers with discontinuous regulation windings|
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