EP4111480B1 - Vorrichtung zur begrenzung eines kurzschlussstromes in einem laststufenschalter sowie laststufenschalter mit dieser vorrichtung - Google Patents

Vorrichtung zur begrenzung eines kurzschlussstromes in einem laststufenschalter sowie laststufenschalter mit dieser vorrichtung Download PDF

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Publication number
EP4111480B1
EP4111480B1 EP21715521.7A EP21715521A EP4111480B1 EP 4111480 B1 EP4111480 B1 EP 4111480B1 EP 21715521 A EP21715521 A EP 21715521A EP 4111480 B1 EP4111480 B1 EP 4111480B1
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EP
European Patent Office
Prior art keywords
current
changer
load tap
load
measurement signal
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.)
Active
Application number
EP21715521.7A
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German (de)
English (en)
French (fr)
Other versions
EP4111480A1 (de
EP4111480C0 (de
Inventor
Laurenc KIRCHNER
Sebastian Rehkopf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Reinhausen GmbH
Scheubeck GmbH and Co
Original Assignee
Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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Application filed by Maschinenfabrik Reinhausen GmbH, Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical Maschinenfabrik Reinhausen GmbH
Publication of EP4111480A1 publication Critical patent/EP4111480A1/de
Application granted granted Critical
Publication of EP4111480C0 publication Critical patent/EP4111480C0/de
Publication of EP4111480B1 publication Critical patent/EP4111480B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • 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
    • 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

Definitions

  • the invention relates to a device for limiting a short-circuit current in an on-load tap-changer, in particular in a load diverter switch of the on-load tap-changer, and to an on-load tap-changer comprising a device for limiting a short-circuit current in the on-load tap-changer.
  • on-load tap changers are used for uninterrupted switching between different winding taps of a control winding of a tapped transformer and thus for voltage regulation. They usually consist of a selector for powerless pre-selection of the winding tap of the tapped transformer to which switching is to take place, as well as a load changeover switch for the actual, uninterrupted switching from the previously connected winding tap to the new, pre-selected winding tap.
  • the selector usually has two movable selector contacts which connect the winding taps.
  • the load changeover switch usually has switching contacts and resistors for the actual load switching.
  • the switching contacts are arranged in the main load branches of the load changeover switch and are used to directly connect the winding tap connected by the respective selector contact to a load discharge via the main load branch.
  • the resistors serve to limit the short-term circulating current flowing in the load changeover switch during the switching process and are also referred to as switching resistors.
  • the load diverter switch may malfunction.
  • One possible malfunction is a short circuit in the on-load tap changer, or more precisely in the load diverter switch, triggered by a flashover between the two main load branches. Since the two main load branches are each electrically connected to a winding tap of the control winding via a selector contact, this can result in a tap short circuit. In concrete terms, this means that the short-circuit current flows via the main load branches and the selector contacts via a control stage of the control winding of the tapped transformer.
  • circuit breakers are provided in the transmission network that are designed to safely switch off high currents in the event of a fault.
  • circuit breakers are provided in the transmission network that are designed to safely switch off high currents in the event of a fault.
  • they require a relatively long time to do this, for example 50 ms.
  • the short-circuit current flows unlimitedly through the conductive components of the tap changer and transformer, which can lead to considerable damage to the on-load tap changer and the control winding of the transformer. This must be avoided.
  • a load tap changer for tapped transformers which has thyristors in anti-parallel connection in a first and a second current branch for switching between the winding taps of the tapped transformer.
  • the load tap changer also includes electrical fuses with resistors connected in parallel which prevent the occurrence of short-circuit currents in the event of a malfunction of the thyristors.
  • the publication CH 404 804 A discloses a switching arrangement for an on-load tap changer, wherein the individual switching paths are provided with double contact points and are connected to one another and to the switching resistors in such a way that, in circuits with rated current, the load changeover switch acts as a normal flag-pennant switch, but in the case of overload currents it only acts as a pennant switch with four interruption points connected in series.
  • the publication WO 2016/169826 A1 refers to an on-load tap changer for uninterrupted switching between winding taps of a control winding of a transformer with a selector and a load changeover switch.
  • the load changeover switch has a changeover switch, a main branch and an auxiliary branch with a current-limiting element. A further switching element is arranged between the main branch and the auxiliary branch.
  • An overcurrent protection device for electrical circuits which comprises a Hall effect device for monitoring the current in the circuit, which, when an overcurrent is detected, energizes a relay, thereby diverting the current to a PTC device.
  • the publication US 4 184 186 A refers to a current limiting device for an alternating current electrical system which achieves a current limiting effect on the first current loop after fault initiation by rapidly diverting the fault current through a low impedance path to earth.
  • the publication EN 10 2016 120 070 A1 discloses a low-voltage protective switching device with a control unit which is designed to control a bypass switch and a semiconductor circuit arrangement upon detection of a short-circuit current by a current measuring arrangement.
  • the improved concept is based on the idea of providing a device that makes it possible to detect a short circuit in the load diverter switch of an on-load tap changer quickly enough and to commutate the increasing short-circuit current to a resistor before critical values are reached, which limits the current to permissible values until a higher-level protection system, for example a circuit breaker, trips and disconnects the transformer from the transmission network.
  • a higher-level protection system for example a circuit breaker
  • the invention proposes a device for limiting a short-circuit current in an on-load tap changer, in particular in a load diverter switch of the on-load tap changer.
  • the device has a first sensor for measuring a current in a first power line of the on-load tap changer, an interruption element, a control device and a current-limiting element.
  • the interruption element is arranged in the first power line of the on-load tap changer.
  • the current-limiting element is arranged in a parallel path to the interruption element, i.e. parallel to the first power line.
  • the first sensor is designed to transmit a first measurement signal, which represents the measured current in the first power line of the on-load tap changer, to the control device.
  • the current measurement and the transmission of the measurement signal can take place continuously or without interruption in time, preferably with a sampling rate of less than one microsecond.
  • the transmission of the measurement signal to the control unit can take place via radio, via an optical fiber or preferably via a wire, particularly preferably via a shielded wire.
  • the sensor is preferably designed as a current transformer. In principle, however, any type of sensor that can continuously measure the temporal progression of a current in a line and transmit it to a control unit in the form of a measurement signal can be used to implement the solution according to the invention.
  • the control device is preferably designed to detect and/or determine the temporal course of the measuring signal which represents the measured current.
  • the first sensor can be arranged outside a housing of the respective transformer whose voltage is regulated by the on-load tap changer, preferably on a cover of the transformer housing, or inside the transformer housing.
  • the interruption element can be actuated by the control device in such a way that it can interrupt the current flow in the first current line of the on-load tap-changer, so that the current flowing in the first current line is commutated, i.e. transferred, to the parallel path with the current-limiting element and is limited by the current-limiting element.
  • the first power line electrically connects the selector, preferably a first movable selector contact, and the load changeover switch, preferably a first main load branch of the on-load tap changer.
  • the interruption element is arranged in a section of the first power line which is located outside the on-load tap changer, i.e. outside the selector and the load diverter switch.
  • the interruption element has a switching time for interrupting the current flow of less than 1.0 ms, preferably less than 0.5 ms and particularly preferably less than 0.1 ms. Due to the short reaction time of the interruption element, the increasing short-circuit current is commutated to the current-limiting element before the short-circuit current reaches a critical value.
  • the interruption element can be arranged outside the transformer housing, preferably on the cover, or inside the transformer housing.
  • the interruption element is designed as a semiconductor switching element or as an explosive or blasting charge or as a mechanical contact arrangement with an electrodynamic drive.
  • the semiconductor switching elements can be designed as IGBTs and/or thyristors, for example.
  • Explosive or blasting charges for separating electrical connections such as cables or rails are well known from the state of the art.
  • Suitable separating agents include pyrotechnic cutting charges, such as those used in EP0052521A1 described, or detonators, as they have been used in medium voltage applications such as the so-called "I s limiter" for decades.
  • a mechanical contact arrangement with an electrodynamic drive can, for example, be in the form of a contact ring system, as in the DE 199 53 551 C1 described, trained and also be a possible means of interrupting the current flow in the first power line.
  • the current-limiting element is designed for a current intensity that corresponds to a multiple of the rated current, for example twice the rated current of the on-load tap-changer.
  • the rated current which is also referred to in the relevant standards as the rated through-current, is the current for which the on-load tap-changer is designed in continuous operation.
  • a current-limiting element of an on-load tap-changer that has a rated current of 800 A is designed according to this preferred embodiment of the invention in such a way that it can briefly limit a short-circuit current to 1600 A, for example for a period of 50 ms.
  • the current-limiting element can be designed as a resistor, for example as an ohmic resistor, as a PTC thermistor, as a fuse with a fusible conductor or as an inductor, in particular as a coil.
  • One of the switching resistors in the load diverter switch of the on-load tap changer can preferably also be connected in parallel to the first power line as a resistor for the device.
  • the device for current limitation comprises, in addition to the first sensor, a second sensor for measuring the current in a second power line of the on-load tap changer.
  • the second sensor is designed to transmit a second measurement signal, which represents the measured current in the second power line of the on-load tap changer, to the control device.
  • the second power line preferably electrically connects the selector, preferably a second movable selector contact, and the load diverter switch, preferably a second main load branch of the load diverter switch.
  • the second sensor is preferably designed analogously to the first sensor and the second measurement signal is preferably designed analogously to the first measurement signal.
  • the second sensor can be arranged outside the transformer housing, in particular on the cover, or inside the transformer housing.
  • control device is configured to actuate the interruption element when both the first measurement signal and the second measurement signal are greater than or equal to a predetermined limit value.
  • the control device determines, based on the first and second measurement signals, whether both the measured current in the first power line and the measured current in the second power line have reached or exceeded the limit value and actuates the interruption element if this is the case.
  • the set limit value is a maximum current value that is a multiple of the rated current of the on-load tap changer. Accordingly, according to this embodiment of the invention, the limit value for an on-load tap changer with a rated current of, for example, 800 A is set to a maximum current value of 1600 A. In concrete terms, this means that the interruption element is actuated by the control device when a current of at least 1600 A is measured in both the first and the second power lines.
  • the set limit value is a maximum change in the current within a predetermined period of time.
  • a limit value according to this embodiment for an on-load tap changer designed for a nominal current of 800 A is 1.2 A/ ⁇ s.
  • the invention proposes an on-load tap changer for uninterrupted switching between winding taps of a tapped transformer.
  • the on-load tap changer has a selector for powerless pre-selection to a selected winding tap, a load changeover switch for the actual load switching from the previous winding tap to the pre-selected winding tap and a first power line that electrically connects the selector and the load changeover switch, preferably a first selector arm and a first main load branch.
  • the on-load tap changer according to the invention comprises a device for limiting a short-circuit current in the on-load tap changer, in particular in the load changeover switch of the on-load tap changer, which is designed according to the first aspect of the invention.
  • the device reference is made to the previous explanations, preferred features and/or advantages in an analogous manner to those already explained for the first aspect of the invention or one of the associated, advantageous embodiments. has been.
  • the on-load tap changer comprises a second power line that electrically connects the selector and the load diverter switch, preferably a second selector arm and a second main load branch.
  • the device comprises a second sensor for measuring the current in the second power line. The second sensor is designed to transmit a second measurement signal, which represents the measured current in the second power line of the on-load tap changer, to the control device.
  • the invention proposes a method for limiting a short-circuit current in an on-load tap changer, in particular in a load diverter switch of the on-load tap changer, wherein the on-load tap changer is designed according to the second aspect of the invention and comprises a device which is designed according to the first aspect of the invention.
  • the method has the following method steps: measuring a current in a first power line of the on-load tap changer by means of a first sensor, transmitting a first measurement signal, which represents the measured current in the first power line of the on-load tap changer, from the first sensor to a control device, actuating an interruption element which is arranged in the first power line of the on-load tap changer in such a way that the current flow in the first power line of the on-load tap changer is interrupted and the current is commutated to a current-limiting element.
  • the current-limiting element is arranged parallel to the interruption element, in particular in a current path parallel to the first power line.
  • the method comprises the further steps of measuring, in addition to the current in the first power line, a current in a second power line of the on-load tap changer by means of a second sensor is measured, in addition to transmitting the first measurement signal, a second measurement signal, which represents the measured current in the second power line of the on-load tap changer, is transmitted from the second sensor to the control device, furthermore the first and the second measurement signal are compared with a set limit value by means of the control device and the interruption element is actuated if both the first measurement signal and the second measurement signal are greater than or equal to the set limit value.
  • a second measurement signal which represents the measured current in the second power line of the on-load tap changer
  • FIG 1 an exemplary embodiment of an on-load tap changer 2 for a tapped transformer 20 is shown schematically.
  • the tapped transformer 20 has a main winding 25 and a control winding 21 with different winding taps N 1 , ..., N J , ..., N N , which are switched on or off by the on-load tap changer 2.
  • the on-load tap changer 2 comprises a selector 11, which can contact the different winding taps N 1 , ..., N J , ..., N N of the control winding 21 by means of two movable selector contacts, and a load changeover switch 8, which carries out the actual load switching from the currently connected to the new, preselected winding tap.
  • the load current flows from the currently connected winding tap N J+1 via the respective selector contact and the load changeover switch 8 to a load discharge 12.
  • FIG 2 a first embodiment of the device according to the invention is shown schematically.
  • the device 1 serves to limit a short-circuit current in the event of a fault in the on-load tap changer 2, in particular the load diverter switch 8.
  • the load diverter switch 8 has a plurality of switching contacts and resistors for switching.
  • the concrete circuit arrangement of the load diverter switch is not essential for the implementation of the invention, however, and so will not be discussed in more detail here.
  • the on-load tap changer 2 comprises a selector 11 with two movable selector arms, each of which contacts a winding tap N J , N J+1 of a control winding of a tapped transformer (not shown).
  • the device 1 comprises a first sensor 3, which is arranged in a first power line 4, and a second sensor 9, which is arranged in a second power line 10.
  • the sensors 3, 9 serve to continuously measure the current that flows through the respective power line 4, 10 and to continuously transmit the measured current in the form of a measurement signal M1, M2 to a control device 6.
  • the sensors 3, 9 can transmit the measurement signals M1, M2 to the control device 6, for example via a signal connection 13.
  • the first power line 4 connects a first movable selector contact of the selector 11 to the load changeover switch 8 of the on-load tap changer 2.
  • the second power line 10 connects a second movable selector contact of the selector 11 to the load changeover switch 8.
  • An interruption element 5 is arranged in the first power line 4, which according to the first embodiment is designed as an IBGT switch 5 and is designed and operable in such a way that it has a in the load changeover switch 8 can commutate the short-circuit current occurring.
  • the semiconductor switching element 5 is actuated by the control device 6 when both the first measurement signal M1 and the second measurement signal M2 are greater than or equal to a set limit value.
  • the current flow in the first power line 4 is then interrupted by the semiconductor switching element 5, so that the current is commutated to a current-limiting element 7.
  • the current-limiting element 7 is designed here, for example, as an ohmic resistor and is arranged parallel to the semiconductor switching element 5 or in a current path 14 parallel to the first power line 4, and is designed such that it can limit the increasing short-circuit current until a higher-level protection system, for example a circuit breaker, is actuated and the affected tap transformer, which is controlled by the load tap changer 2, is disconnected from the transmission network.
  • a higher-level protection system for example a circuit breaker
  • FIG 3 A second embodiment of the device according to the invention is shown schematically.
  • the device 1 from the Figure 3 is referred to the previous explanations of the device from Figure 2 in an analogous manner and in the following only the differences to the device from Figure 2
  • the device 1 from Figure 3 has an interruption element 5 and a current-limiting element 7, which are designed, for example, in the form of a current-limiting switching unit, as is known, for example, from DE 199 53 551 C1
  • This switching unit comprises a contact ring system with an electrodynamic drive which interrupts the current flow in the first power line 4 in the event of a short circuit.
  • two parallel commutation paths are provided, for example, wherein the commutation path to which the current is commutated last has a PTC element 7 which serves as a current-limiting element and is designed in such a way that it can limit the short-circuit current until a higher-level protection system takes effect.
  • FIG 4 A third embodiment of the device according to the invention is shown schematically.
  • Figure 4 shows in particular an exemplary spatial arrangement of the device 1 according to the invention.
  • the device 1 limits a short-circuit current in the event of a fault in the on-load tap changer 2, which regulates the voltage ratio of the tapped transformer 20.
  • the tapped transformer 20 has a housing 23, in particular an oil tank, with a cover 24.
  • the on-load tap changer 2 is arranged under the cover 24 of the transformer, with the selector 11 being located spatially below the load diverter switch 8.
  • the first power line 4 leads from a first selector contact, which contacts a winding tap N J (not shown), via a bushing 22 from the inside of the housing 23 to the outside or from the outside to the inside and finally inside into the load changeover switch 8.
  • the sensor 3 and the interruption element 5 are arranged between the bushings 22.
  • the bushings 22 can, for example, be standard bushings designed in accordance with DIN standards for applications in the 4 kV range.
  • the resistor 7, which is located in the transformer housing 23, is arranged parallel to the first power line 4.
  • one of the switching resistors in the load changeover switch 8 can also serve as a current-limiting element 7 and be connected parallel to the first power line 4.
  • the second power line 10 which leads from a second selector contact that contacts a winding tap N J+1 (not shown) into the load diverter switch 8
  • a second sensor 9 is arranged in a section that lies outside the load diverter switch 8 and the selector 11.
  • the second sensor 9 is therefore located inside the transformer housing 23.
  • the load current is transferred from the load diverter switch 8 via a further bushing 22 from the inside to the outside to a load discharge line 12.
  • the device 1 comprises the first sensor 3, the interruption element 5, the current-limiting element 7 and the control device 6.
  • the method has, for example, the successive steps 100, 200 and 500.
  • a current in a first power line of the on-load tap changer is measured using the first sensor.
  • a first measurement signal which represents the measured current in the first power line of the on-load tap changer, is transmitted from the first sensor to the control device.
  • the interruption element which is arranged in the first power line of the on-load tap changer, is actuated by the control device in such a way that the current flow in the first power line of the on-load tap changer is interrupted and the current is commutated to the current-limiting element.
  • the device 1 additionally comprises the second sensor 9.
  • the method comprises, for example, steps 100, 101, 200, 201, 300, 301 and 400, wherein steps 100 and 200 are identical to steps 100 and 200 from Figure 5
  • the procedure from Figure 6 additionally comprises step 101, according to which, in addition to measuring the current in the first power line in step 100, a current in a second power line of the on-load tap changer is measured by means of the second sensor.
  • step 101 which follows step 101, in addition to transmitting the first measurement signal in step 200, a second measurement signal, which represents the measured current in the second power line of the on-load tap changer, is transmitted from the second sensor to the control device.
  • step 300 which follows step 200, the first measurement signal is compared with a set limit value by means of the control device. If the first measurement signal is greater than or equal to the set limit value (in Fig.6 indicated by “Yes"), in a step 301 the second measurement signal is also compared with the set limit value by means of the control device. If the second measurement signal is also greater than or equal to the set limit value (in Fig.6 indicated by “Yes"), in a next step 400 the interruption element is actuated by the control device.
  • step 300 If it is determined in step 300 that the first measurement signal is below the set limit value (in Fig.6 indicated by "No"), steps 100 and 101 are carried out again.
  • the interrupt element is not activated.
  • step 301 If it is determined in step 301 that the second measurement signal is below the set limit value (in Fig.6 indicated by "No"), steps 100 and 101 are carried out again.
  • the interrupt element is not activated.
  • the second measurement signal can also be compared with the limit value first and then the first measurement signal.

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  • Protection Of Transformers (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP21715521.7A 2020-04-22 2021-03-24 Vorrichtung zur begrenzung eines kurzschlussstromes in einem laststufenschalter sowie laststufenschalter mit dieser vorrichtung Active EP4111480B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020110935.0A DE102020110935B3 (de) 2020-04-22 2020-04-22 Vorrichtung und verfahren zur begrenzung eines kurzschlussstromes in einem laststufenschalter sowie laststufenschalter mit dieser vorrichtung
PCT/EP2021/057513 WO2021213769A1 (de) 2020-04-22 2021-03-24 Vorrichtung zur begrenzung eines kurzschlussstromes in einem laststufenschalter sowie laststufenschalter mit dieser vorrichtung

Publications (3)

Publication Number Publication Date
EP4111480A1 EP4111480A1 (de) 2023-01-04
EP4111480C0 EP4111480C0 (de) 2024-05-08
EP4111480B1 true EP4111480B1 (de) 2024-05-08

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Country Status (5)

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EP (1) EP4111480B1 (ja)
JP (1) JP2023523184A (ja)
CN (1) CN115443514A (ja)
DE (1) DE102020110935B3 (ja)
WO (1) WO2021213769A1 (ja)

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Publication number Priority date Publication date Assignee Title
CN114295971B (zh) * 2021-12-30 2024-05-28 国网河北省电力有限公司电力科学研究院 有载分接开关状态检测装置、方法及控制设备
DE102023108835B3 (de) 2023-04-06 2024-06-06 Maschinenfabrik Reinhausen Gmbh Laststufenschalter und verfahren zur betätigung

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US4184186A (en) * 1977-09-06 1980-01-15 General Electric Company Current limiting device for an electric power system
DE69630608T2 (de) * 1995-09-14 2004-09-23 Tyco Electronics Corp. Überstromschutz für elektrische schaltungen
DE102016120070A1 (de) * 2016-10-21 2018-04-26 Eaton Industries (Austria) Gmbh Niederspannungs-Schutzschaltgerät

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CH404804A (de) * 1962-05-17 1965-12-31 Reinhausen Maschf Scheubeck Schaltanordnung für Lastumschalter von Stufenschaltern bei Regeltransformatoren
DE2207367C2 (de) * 1972-02-17 1974-02-28 Reinhausen Maschf Scheubeck Anordnung zur Verhinderung von Stufenkurzschlüssen bei Lastumschaltern von Stufentransformatoren mit antiparallel geschalteten Thyristoren
DE3171841D1 (en) 1980-11-19 1985-09-19 Qed Design & Dev Ltd Linear shaped charges
DE19953551C1 (de) 1999-11-08 2001-08-16 Abb Hochspannungstechnik Ag Zu Schneller strombegrenzender Schalter
JP4847970B2 (ja) * 2005-01-31 2011-12-28 ジョージア テック リサーチ コーポレイション アクティブサージ電流制限器
DE102012109174A1 (de) * 2012-09-27 2014-03-27 Maschinenfabrik Reinhausen Gmbh Laststufenschalter mit Vorwähler
DE102015106178A1 (de) * 2015-04-22 2016-10-27 Maschinenfabrik Reinhausen Gmbh Laststufenschalter

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Publication number Priority date Publication date Assignee Title
US4184186A (en) * 1977-09-06 1980-01-15 General Electric Company Current limiting device for an electric power system
DE69630608T2 (de) * 1995-09-14 2004-09-23 Tyco Electronics Corp. Überstromschutz für elektrische schaltungen
DE102016120070A1 (de) * 2016-10-21 2018-04-26 Eaton Industries (Austria) Gmbh Niederspannungs-Schutzschaltgerät

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CN115443514A (zh) 2022-12-06
WO2021213769A1 (de) 2021-10-28
EP4111480A1 (de) 2023-01-04
EP4111480C0 (de) 2024-05-08
DE102020110935B3 (de) 2021-07-01
JP2023523184A (ja) 2023-06-02

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