EP4173012A1 - On-load tap changer and method for actuating an on-load tap changer - Google Patents
On-load tap changer and method for actuating an on-load tap changerInfo
- Publication number
- EP4173012A1 EP4173012A1 EP21737610.2A EP21737610A EP4173012A1 EP 4173012 A1 EP4173012 A1 EP 4173012A1 EP 21737610 A EP21737610 A EP 21737610A EP 4173012 A1 EP4173012 A1 EP 4173012A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control unit
- tap changer
- load tap
- semiconductor switching
- switching element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0016—Contact arrangements for tap changers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0027—Operating mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H2009/0061—Monitoring tap change switching devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
- H01H2009/544—Contacts shunted by static switch means the static switching means being an insulated gate bipolar transistor, e.g. IGBT, Darlington configuration of FET and bipolar transistor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/548—Electromechanical and static switch connected in series
Definitions
- the invention relates to an on-load tap changer for uninterrupted switching between winding taps of a tapped transformer under load.
- the on-load tap changer consists of a mechanical tap selector for power-free pre-selection of the respective winding tap to which the switchover is to be made, and a diverter switch with semiconductor switching elements as switching means for the actual uninterrupted switchover from the previous to the previously selected new winding tap under load.
- On-load tap changers of this type are usually also referred to as hybrid tap changers because they also have mechanical contacts in addition to the electronic power switching means.
- Such a hybrid tap changer is known from EP 2319058 B1.
- This has two load branches, each of which connects a winding tap via a mechanical switch and a series connection of two IGBTs connected in opposite directions to a common load shunt.
- a diode is provided in parallel with each IGBT.
- a varistor is in turn provided in parallel with each individual IGBT.
- each of the load branches is bridged with a permanent mechanical main contact.
- the IGBTs on both sides are controlled by a common IGBT driver.
- the disadvantage of this solution is that the tap changer does not have a monitoring function, such that the mechanical switching contacts are only actuated when the functionality of the semiconductor switching elements has been ensured. If the IGBT on one side fails unnoticed and the switching process continues, a tap short circuit occurs, which has serious, destructive consequences for the tap changer and the tapped transformer.
- an on-load tap changer for uninterrupted switching between winding taps of a stepped transformer.
- the on-load tap changer includes a load tap changer for switching from a first fixed contact to a second fixed contact of the on-load tap changer, a selector for power-free preselection of the fixed contacts before the actual switching under load, a first control unit and a second control unit.
- the diverter switch has a plurality of semiconductor switching elements and a plurality of mechanical switching elements.
- the selector has a first selector arm and a second selector arm that are independently operable and can contact each of the fixed contacts. Each fixed contact is electrically connected to a winding tap of the tapped transformer. The total number of fixed contacts depends on the number of winding taps.
- the first control unit is set up to trigger a switching command and, depending on this, to actuate the first selector arm, the second selector arm and the plurality of mechanical switching elements by means of a motor drive.
- the second control unit is configured to actuate the plurality of semiconductor switching elements. During a switching process of the on-load tap changer, the first control unit actuates the motor drive as a function of the second control unit.
- the motor drive can be designed as a direct current motor, as a brushless direct current motor, as a servomotor, in particular a torque motor.
- the motor drive is preferably designed as a stepping motor.
- the on-load tap changer includes a first sensor for measuring a first measured value, which is the voltage drop at a first Semiconductor switching element and a second sensor for measuring a second measured value TES, which represents the voltage drop across a second semiconductor switching element.
- the first sensor is set up to transmit the first measured value to the second control unit.
- the second sensor is set up to transmit the second measured value to the second control unit.
- the second control unit is in turn set up to transmit a status report to the first control unit as a function of the first and/or the second measured value.
- the second control unit is set up to transmit the status message “Error” or the status message “OK”.
- the "Error” status message represents that the switching on or off process of the semiconductor switching element was unsuccessful, for example because the semiconductor switching element is defective.
- the status message "OK” represents that the switching on or off process of the semiconductor switching element was carried out without errors.
- the second control unit is set up to transmit the status message "Error" to the first control unit if the first sensor transmits a measured value that exceeds a previously specified first limit value within a specified time, the first sensor transmits a measured value that exceeds a previously specified limit second limit value within a specified time, the second sensor transmits a measured value that does not fall below a previously defined third limit value within a specified time, the first and/or the second sensor does not transmit a measured value within a specified time.
- the second control unit transmits the status message "OK".
- the first limit value is preferably between 2 and 10 volts, and the first limit value is particularly preferably 5 volts.
- the second limit value is preferably between 40 and 80 volts, and the second limit value is particularly preferably 50 volts.
- the third limit value is preferably between 40 and 80 volts, and the third limit value is particularly preferably 50 volts.
- the second control unit is preferably designed as a microcontroller and set up to to record and evaluate the measured values via analog inputs and/or by means of comparators and to output the status messages depending on this.
- the first control unit is preferably also designed as a microcontroller.
- the first and second sensors are preferably designed as voltage dividers with two ohmic resistors.
- the first control unit is set up to receive the status message from the second control unit and, depending on this and depending on the point in time within the switching process at which the status message is received, either to return the motor drive to the starting position or continue the switchover.
- the latter specifically means that as the switchover continues, the mechanical switching elements of the diverter switch and the first and/or second selector contact are actuated by means of the motor drive, for example via a common drive shaft.
- the first control unit is preferably set up to drive the motor drive back into the starting position when
- the first sensor transmits a measured value to the second control unit, which exceeds the first limit value within a predetermined time
- the first sensor transmits a measured value to the second control unit which does not exceed the second limit value within a specified time
- the second control unit is preferably also set up to actuate the motor drive and to continue the switchover if the second sensor transmits a measured value to the second control unit which does not fall below the third limit value within a predetermined time,
- the status message can be transmitted from the second control unit to the first control unit via an optical fiber or wirelessly, for example via Bluetooth or radio.
- the optical waveguide can be cast in plastic, for example in the drive shaft, or it can be formed separately without a sheath.
- the on-load tap changer includes a third sensor for measuring at least one third measured value, which represents the course of the current over time at the semiconductor switching elements.
- the third sensor is designed as a current sensor, in particular as an alternating current sensor.
- the third sensor is set up to transmit the third measured value to the second control unit.
- the second control unit is in turn set up to switch off the semiconductor switching elements as a function of the third measured value.
- the third measured value means here specifically, depending on the time course of the current that flows through the semiconductor switching elements. Switching off preferably takes place at the current zero crossing.
- the diverter switch has a first main branch, which connects the first selector arm to a load derivative via a first mechanical switching element, a second main branch, which connects the second selector arm to the load derivative via a second mechanical switching element, and a first auxiliary branch a first semiconductor switching element formed in parallel with the first main branch, and a second auxiliary branch having a second semiconductor switching element formed in parallel with the second main branch.
- the mechanical switching elements are preferably designed as permanent main contacts.
- a voltage-dependent resistor is arranged in parallel with the first and/or the second auxiliary branch or in parallel with the first and/or second semiconductor switching element.
- the voltage-dependent resistor is preferably designed as a varistor.
- the on-load tap changer is designed in such a way that when the switching is carried out during the actuation of the first selector arm and/or the second selector arm, none of the semiconductor switching elements is activated.
- the on-load tap changer is formed in such a way that switching elements, the first selector arm and the second selector arm contact different fixed contacts when the switching is carried out while the semiconductors are being actuated.
- the second control unit has an energy store that is charged when the first selector arm and the second selector arm contact different, adjacent fixed contacts. Charging takes place via the step voltage applied between the first selector arm and the second selector arm in the described position.
- the energy store provides the energy required to actuate the semiconductor switching elements and to transmit the status reports from the second control unit to the first control unit.
- the second control unit and thus also the semiconductor switching elements are thus operated independently by means of the applied voltage steps. An additional energy supply from the outside, for example by the first control unit, is therefore not required.
- the energy store is preferably formed from ceramic capacitors and accordingly has a high temperature resistance. Since it is constantly being recharged while the second control unit and the semiconductor switching elements are being actuated, it only has to absorb peak loads that occur. A switched-mode power supply with an extremely wide input voltage range that still works even with low step voltages is preferably used to charge the energy store.
- the second control unit is preferably set up to monitor the charging of the energy store by measuring the voltage at one of the analog inputs and to transmit an “OK” status message to the first control unit when the energy store is fully charged.
- the first control unit is preferably set up to return the motor drive to the starting position if the status report is not received within a predetermined time.
- the semiconductor switching elements are in the form of IGBT switching elements and/or thyristors and/or JFET switching elements and/or MOSFET switching elements and/or integrated gate commutated thyristors (IGCT).
- the semiconductor switching elements are preferably in the form of an IGBT with diodes in a bridge circuit, particularly preferably with diodes in a Graetz circuit.
- the first control unit can be arranged above the motor drive relative to a longitudinal axis L of the on-load tap changer and the second control unit can be arranged below the diverter switch relative to the longitudinal axis L of the on-load tap changer.
- the first control unit is preferably arranged outside of a housing of the stepped transformer.
- the motor drive and/or the semiconductor switching elements and/or the second control unit can be arranged outside or inside the transformer housing.
- the on-load tap changer additionally comprises a second and third diverter switch, a second and third selector, and a second and third second control unit for a second and third phase of the tapped transformer to be regulated.
- the plurality of semiconductor switching elements of each diverter switch are each assigned to a second control unit.
- the first control unit is set up to trigger a switching command and to actuate the first selector arm and the second selector arm of each selector and the plurality of mechanical switching elements of each diverter switch by means of a motor drive.
- Each second control unit is directed to actuate the plurality of semiconductor switching elements of the diverter switch assigned to it. The first control unit actuates the motor during the switchover depending on every second control unit.
- the on-load tap changer for a second and third phase of the tapped transformer to be regulated additionally comprises a second and third motor drive, a second and third diverter switch, a second and third selector, and a second and third second control unit.
- Each motor drive is assigned a selector, ie a first selector arm and a second selector arm, and a plurality of mechanical switching elements of the diverter switch for actuation. The assignment is mechanical, for example via a drive shaft and a gear.
- the plurality of semiconductor switching elements of each diverter switch are each assigned to a second control unit.
- the first control unit is set up to trigger a switching command and to actuate each motor drive, and thus also the respectively assigned first selector arm and second selector arm and the respectively assigned plurality of mechanical switching elements.
- Each second control unit is set up to actuate the plurality of semiconductor switching elements assigned to it. In this case, the first control unit actuates each motor drive as a function of each second control unit during the switchover.
- a method for actuating an on-load tap changer that is designed according to the first aspect of the improved concept is specified.
- none of the semiconductor switching elements is activated during the actuation of the first selector arm and/or the second selector arm.
- the method comprises the further steps:
- the actuation of the mechanical switching elements, the selector arms and the semiconductor switching elements after the switching command has been generated comprises the following steps
- the first semiconductor switching element is switched off as a function of the time profile of the current. Switching off preferably takes place when the current passes through zero.
- the switchover is continued in any case, independently of the status report from the second control unit.
- FIG. 1 shows an exemplary embodiment of an on-load tap changer in a schematic representation
- FIG. 2 shows an exemplary, schematic arrangement of an exemplary embodiment of an on-load tap changer according to the improved concept in a tapped transformer
- FIG. 3 shows a schematic representation of an exemplary embodiment of an on-load tap changer according to the improved concept
- FIGS. 4a to 4m show an exemplary switching sequence of the on-load tap changer from FIG. 3;
- FIG. 5 shows an exemplary, schematic arrangement of a further exemplary embodiment of an on-load tap changer according to the improved concept in a tapped transformer.
- an exemplary embodiment of an on-load tap changer 10 for a tapped transformer 20 is shown schematically.
- the tapped transformer 20 has a main winding 21 and a control winding 22 with different winding taps Ni, ..., Nj, ..., N N , which is switched on or off by the on-load tap changer 10 who the.
- the on-load tap changer 10 includes a selector 11, which can contact the different winding taps Ni, ..., Nj, ..., N N N of the control winding 22 by means of two movable selector contacts, and a diverter switch 12, which is the actual diverter switch from the currently connected to the new, preselected winding tap.
- the load current flows from the currently connected winding tap Nj or Nj +i via the respective selector contact and the diverter switch 40 to a load dissipation 17.
- FIG. 2 shows an exemplary, schematic arrangement of an exemplary embodiment of an on-load tap changer based on the improved concept in a tapped transformer.
- the on-load tap changer 10 has a selector 11 for power-free preselection of the fixed contacts (not shown), a diverter switch 12 for carrying out the actual diverter switching by means of a plurality of mechanical switching elements and semiconductor switching elements (not shown), a motor drive 13, a first control unit 14 and a second Control unit 15 on.
- the on-load tap changer 10 has three sensors that are arranged in the diverter switch 40 .
- the two sensors 51 and 52 are voltage sensors and are designed to transmit the measured values M1 and M2, which represent the voltage drop across the semiconductor switching elements, to the second control unit 15.
- the third sensor 53 is a current sensor and is designed to transmit the third measured value M3, which represents the time profile of the current at the semiconductor switching elements, to the second control unit 15.
- the second control unit 15 includes an energy store 18 which is directly attached to the second control unit 15 .
- the first control unit 14 is related to a longitudinal axis L of the on-load tap changer 10 arranged above the motor drive 13 and outside of the transformer 20 stages. The remaining part of the on-load tap changer 10 is arranged within the tapped transformer 20, the second control unit 15 and the energy storage device 18 being arranged below the diverter switch 40 in relation to the longitudinal axis L.
- FIG. 3 shows a schematic representation of an exemplary embodiment of an on-load tap changer according to the improved concept.
- the on-load tap changer 10 comprises at least a first fixed contact 11 and a second fixed contact 12, each of which can be connected to a winding tap of the control winding 22 of the tapped transformer 20.
- the total number of fixed contacts depends on the number of winding taps.
- Each fixed contact 11, 12 has a first contact surface and a second contact surface.
- the on-load tap changer 10 comprises a selector with a first selector arm 31 and a second selector arm 32, which can be actuated independently of one another and can contact each of the fixed contacts.
- the first movable contact 31 can contact the first contact surfaces of the fixed contacts 11, 12, but not the second contact surfaces.
- FIG. 3 shows a schematic sketch of an exemplary embodiment of the load step switch; in particular, the arrangement of the contact surfaces opposite one another is not absolutely necessary.
- the on-load tap changer 10 also includes a diverter switch 40 for performing the actual diverter switch between the preselected fixed contacts 11, 12.
- the diverter switch 40 has a total of four current branches.
- a first main branch 41 connects the first selector arm 31 via a first mechanical switching element 43 to the load transfer line 17.
- a second main branch 42 connects the second selector arm 32 via a second mechanical switching element 44 to the load transfer 17.
- Parallel to the first main branch 41 is a first auxiliary branch 45 with a first semiconductor switching element 47 and parallel to the second main branch 42, a second auxiliary branch 46 with a second semiconductor switching element 48 is arranged.
- a varistor 49 is provided in parallel with the first and the second auxiliary branch 45, 46 in each case.
- the first sensor 51 designed as a voltage sensor
- the second sensor 52 also designed as a voltage sensor
- the third sensor 53 is arranged in the common derivative.
- a first control unit 14 is set up to trigger a switching command and to actuate the first selector arm 31, the second selector arm 32 and the first and the second mechanical switching element 43, 44 by means of the motor drive (not shown).
- a switching command is triggered to keep the primary voltage or the secondary voltage of the step transformer 20 in a predetermined voltage range.
- a voltage regulator 50 is provided, for example, which monitors compliance with the predetermined voltage band.
- a second control unit 15 of the on-load tap changer 10 is set up to activate the first and the second semiconductor switching element 47, 48.
- the second control unit 15 includes an energy store (not shown), which is charged via the voltage difference that occurs between the first selector arm 31 and the second selector arm 32 when they make contact with different, adjacent fixed contacts 11 , 12 .
- the first control unit 14 receives from the second unit 15 Steuerein status reports S, depending on which they operated the motor drive (not provided is shown).
- the on-load tap changer 10 is in a stationary position.
- the first and the second selector arm 31, 32 are both on the fixed contact 11, so that the second control unit 15 is de-energized and thus the semiconductor switching elements 45 and 46 are deactivated.
- the load current IL flows in equal parts from the contacted fixed contact 11 via the two selector arms 31, 32, the first and the second main branch 41, 42 and the closed mechanical switching elements 43 and 44 to the load output line 17.
- FIGS. 4a to 4m An exemplary switching sequence of the on-load tap changer from FIG. 3 is shown in FIGS. 4a to 4m.
- the second selector arm 32 is moved from the first fixed contact 11 to the two th fixed contact 12 ( Figure 4b).
- the two selector arms 31, 32 are now on different fixed contacts 11, 12 and the motor drive 13 stops.
- the energy store (not shown) is now charged by the step voltage USP and the second control unit 15 is thus supplied with energy for actuating the semiconductor switching elements 45 and 46 .
- the second control unit 15 sends a status message S "OK" to the first control unit 14. If this signal does not arrive within a specified time, for example 50 ms, the first control unit 14 causes the motor drive 13 to return to the starting position.
- the first semiconductor switching element 47 is switched on by the second control unit 15 in the next step, shown in FIG. 4d. No current worth mentioning flows through this at this moment, since the volume resistance of the first semiconductor switching element 47 is significantly greater than that of the first mechanical switching element 43.
- the first control unit 14 actuates the motor drive 13 again and the first mechanical switching contact 43 is then opened (FIGS. 4e and 4f). Thereafter, the motor drive 13 is stopped again.
- the steps shown in FIGS. 4d to 4f are monitored by the second control unit 15 using the first voltage sensor 51.
- FIG. The first voltage sensor 51 measures the voltage drop across the first flicker switching element 47 and transmits this first measured value M1 to the second control unit 15.
- the second control unit 16 transmits the status message S "OK" to the first control unit 14 and the shifting process is continued properly.
- the first semiconductor switching element 47 is defective, an arc occurs when the first mechanical switching contact 43 opens. The voltage would then be many times greater and amount to 20 volts, for example.
- the second control unit 16 sends the status message S "Error" to the first control unit 14, whereupon the first control unit 14 causes the motor drive 13 to return to the starting position.
- the second control unit 15 uses the current sensor 53 to monitor the time profile of the current at the first semiconductor switching element 47 .
- the first semiconductor switching element 47 is switched off when the current passes through zero (FIG. 4g).
- the turn-off process of the first semiconductor switching element 47 is monitored by the second control unit 15 using the first voltage sensor 51 .
- the load current continues to flow via the varistors 49, which are arranged in parallel with the semiconductor switching elements 47 and 48, as shown in FIG. 4h.
- the voltage drop across the first semiconductor switching element 47 rises sharply, specifically to the forward voltage of the varistors, which is several 100V.
- the second control unit 15 monitors whether the voltage exceeds a defined threshold of 50V, for example, within a specified time. If this is the case, the second control unit 15 transmits the status message S "OK" to the first control unit 14 and the shifting process is continued properly. Otherwise, if the voltage remains below the specified limit value, this is an indication that the first semiconductor switching element 47 has failed to switch off, and the second control unit 16 sends the status message S "Error" to the first control unit 14, whereupon the first control unit 14 switches off the motor drive 13 caused to return to the starting position.
- the second control unit 15 immediately turns on the second semiconductor switching element 48 .
- This step is also monitored again by the second control unit 15 by using the second voltage sensor 52 to measure the voltage drop across the second semiconductor switching element 48 . If the voltage falls to the forward voltage of the second semiconductor switching element 48 in the amount of a few volts, then the turn-on was successful and the load current flows through the second auxiliary branch 46, as shown in Figure 4i.
- the second control unit 15 monitors whether the voltage dropping across the second semiconductor switching element 48 falls below a defined threshold of, for example, 50V within a specified time. If this is the case, the second control unit 15 transmits the status message S "OK" to the first control unit 14 and the switching process is continued properly. If this is not the case, the second control unit 15 detects an error and sends the status message S "Error" to the first control unit 14. From this point in time, however, the switching process is no longer aborted, since the load switching process is already half complete and on Reversing to the starting position would require greater control effort.
- the first control unit 14 causes the motor drive 13 to continue to run in order to complete the switching.
- the second mechanical switching element 44 is closed ( Figure 4j).
- the second control unit 15 then switches off the second semiconductor switching element 48 (FIG. 4k). This can be done, for example, based on the detection of a reduction in the voltage drop across the second semiconductor switching element 48 as a result of the closing of the second mechanical switching element 44 .
- the switch-off time is not critical, since the switch-off takes place at the latest after the second control unit 15 is no longer supplied with voltage and the voltage of the energy store has dropped.
- FIG. 5 shows an exemplary, schematic arrangement of a further exemplary embodiment of an on-load tap changer according to the improved concept in a step transformer.
- the on-load tap changer 10 for a second and third phase to be controlled (not shown) of the tapped transformer 20 additionally comprises a second and third motor drive 13, a second and third diverter switch 40, a second and third selector 30, and a second and third second Control unit 15, each with an energy store 18.
- Each motor drive 13 is assigned a selector 40, i.e. a first selector arm and a second selector arm (not shown), as well as a plurality of mechanical switching elements (not shown) of the diverter switch 40 for actuation .
- the plurality of semiconductor switching elements (not shown) of each load changeover switch 40 are each associated with a second control unit 15 .
- a central, first control unit 14 is provided for all three phases, which is designed to trigger a switching command and to actuate each motor drive 13 depending on the respective second control unit 15 assigned to the corresponding phase.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
- Control Of Electrical Variables (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020119344.0A DE102020119344A1 (en) | 2020-07-22 | 2020-07-22 | LOAD CONTROLLER AND METHOD OF OPERATING A LOAD CONTROLLER |
PCT/EP2021/067691 WO2022017732A1 (en) | 2020-07-22 | 2021-06-28 | On-load tap changer and method for actuating an on-load tap changer |
Publications (1)
Publication Number | Publication Date |
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EP4173012A1 true EP4173012A1 (en) | 2023-05-03 |
Family
ID=76796960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP21737610.2A Pending EP4173012A1 (en) | 2020-07-22 | 2021-06-28 | On-load tap changer and method for actuating an on-load tap changer |
Country Status (11)
Country | Link |
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US (1) | US20230141822A1 (en) |
EP (1) | EP4173012A1 (en) |
JP (1) | JP2023534521A (en) |
KR (1) | KR20230038431A (en) |
CN (1) | CN115735254A (en) |
AU (1) | AU2021312968A1 (en) |
BR (1) | BR112022026682A2 (en) |
DE (1) | DE102020119344A1 (en) |
MX (1) | MX2023000987A (en) |
WO (1) | WO2022017732A1 (en) |
ZA (1) | ZA202213853B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102022105034B3 (en) * | 2022-03-03 | 2023-06-07 | Maschinenfabrik Reinhausen Gmbh | On-load tap changer and step transformer with on-load tap changer |
CN116721848B (en) * | 2023-06-05 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司广州局 | On-load tap changer and control method thereof |
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AU611126B2 (en) | 1987-02-19 | 1991-06-06 | Westinghouse Electric Corporation | Electromagnetic contactor with lightweight wide range current transducer with sintered powdered metal core |
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FI84766C (en) | 1990-06-26 | 1992-01-10 | Abb Stroemberg Kojeet Oy | ELECTRONIC HJAELPKONTAKT FOER KONTAKTOR. |
US5774323A (en) | 1995-10-31 | 1998-06-30 | Eaton Corporation | Detection of contact position from coil current in electromagnetic switches having AC or DC operated coils |
MXPA06002635A (en) * | 2003-09-08 | 2006-09-04 | Cooper Technologies Co | Preventive maintenance tapping and duty cycle monitor for voltage regulator. |
DE102004062266A1 (en) | 2004-12-23 | 2006-07-13 | Siemens Ag | Method and device for safe operation of a switching device |
AU2008361188B2 (en) | 2008-08-27 | 2014-11-20 | Maschinenfabrik Reinhausen Gmbh | Method for switching without any interruption between winding taps on a tap-changing transformer |
CA2831592C (en) * | 2011-03-27 | 2019-05-21 | Abb Technology Ag | Tap changer with an improved drive system |
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2020
- 2020-07-22 DE DE102020119344.0A patent/DE102020119344A1/en active Pending
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2021
- 2021-06-28 US US18/003,372 patent/US20230141822A1/en active Pending
- 2021-06-28 JP JP2023503417A patent/JP2023534521A/en active Pending
- 2021-06-28 EP EP21737610.2A patent/EP4173012A1/en active Pending
- 2021-06-28 CN CN202180046469.7A patent/CN115735254A/en active Pending
- 2021-06-28 KR KR1020227046450A patent/KR20230038431A/en unknown
- 2021-06-28 BR BR112022026682A patent/BR112022026682A2/en unknown
- 2021-06-28 MX MX2023000987A patent/MX2023000987A/en unknown
- 2021-06-28 AU AU2021312968A patent/AU2021312968A1/en active Pending
- 2021-06-28 WO PCT/EP2021/067691 patent/WO2022017732A1/en active Application Filing
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2022
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Also Published As
Publication number | Publication date |
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US20230141822A1 (en) | 2023-05-11 |
KR20230038431A (en) | 2023-03-20 |
JP2023534521A (en) | 2023-08-09 |
MX2023000987A (en) | 2023-03-01 |
BR112022026682A2 (en) | 2023-01-31 |
DE102020119344A1 (en) | 2022-01-27 |
CN115735254A (en) | 2023-03-03 |
ZA202213853B (en) | 2023-09-27 |
WO2022017732A1 (en) | 2022-01-27 |
AU2021312968A1 (en) | 2023-03-16 |
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