CN115443514A - Device for limiting short-circuit current in an on-load tap changer and on-load tap changer with said device - Google Patents
Device for limiting short-circuit current in an on-load tap changer and on-load tap changer with said device Download PDFInfo
- Publication number
- CN115443514A CN115443514A CN202180028918.5A CN202180028918A CN115443514A CN 115443514 A CN115443514 A CN 115443514A CN 202180028918 A CN202180028918 A CN 202180028918A CN 115443514 A CN115443514 A CN 115443514A
- Authority
- CN
- China
- Prior art keywords
- current
- tap 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.)
- Pending
Links
- 238000005259 measurement Methods 0.000 claims abstract description 61
- 238000004804 winding Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 28
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000002360 explosive Substances 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 description 8
- 230000006378 damage Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Protection Of Transformers (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a device (1) for limiting a short-circuit current in an on-load tap changer (2), in particular in an on-load diverter switch (8) of the on-load tap changer (2), comprising a first sensor (3) for measuring a current in a first current line (4) of the on-load tap changer (2), an interruption element (5), a control device (6) and a current limiting element (7), wherein the interruption element (5) is arranged in the first current line (4) of the on-load tap changer (2), the current limiting element (7) is arranged in parallel with the interruption element (5), the first sensor (3) is configured to transmit a first measurement signal M, which is representative of the current measured in the first current line (4) of the on-load tap changer (2), to the control device (6), and the interruption element (5) can be actuated by the control device (6) in such a way that it can interrupt the current in the first current line (4) of the on-load tap changer (2) and thereby direct the guided current to the current limiting element (7).
Description
Technical Field
The present invention relates to a device for limiting short-circuit current in an on-load tap changer, in particular in an on-load diverter switch of an on-load tap changer, and to an on-load tap changer comprising a device for limiting short-circuit current in an on-load tap changer.
Background
In a known manner, on-load tap changers are used for uninterrupted changeover between different winding taps of a regulating winding of a tap transformer and thus for voltage regulation. An on-load tap changer usually consists of a selector for the powerless preselection of the winding tap of the tap transformer to be switched to, and an on-load changeover switch for switching over virtually uninterrupted from the winding tap switched on so far to a new preselected winding tap. For the unpowered preselection of the winding taps, the selector usually has two movable selector contacts which close the winding taps. Load transfer switches usually have switching contacts and resistors for the actual load transfer. The switch contacts are arranged in a main load branch of the load changeover switch and are used for directly connecting the winding taps switched on by the respective selector contacts to the load lines via the main load branch. The resistor serves to limit the circulating current which flows in the load changeover switch for a short time during the changeover process and is also referred to as a transition resistor.
In the event of an irregular operation of the on-load tap changer, a malfunction of the on-load diverter switch may result. One possible functional fault is a short circuit in an on-load tap changer, more precisely in an on-load diverter switch, triggered by arcing between two main load branches. This can lead to a short-circuit of the tap connection, since the two main load branches are each electrically connected to the winding tap of the control winding via the selector contacts. In particular, this means that the short-circuit current flows via the main load branch and the selector contact via the regulating stage of the regulating winding of the tap transformer.
In order to protect the transformer against considerable damage or destruction in the event of a short circuit, power switches are provided in the transmission network, which are designed to reliably switch off high currents in the event of a fault. However, for this reason, they require a relatively long time, for example 50ms. During this time duration, the short-circuit current flows unrestricted through the tap changer and the conductive components of the transformer, which can lead to significant damage to the on-load tap changer and the regulating winding of the transformer. This is to be avoided.
Disclosure of Invention
On this background, the invention proposes the subject matter of the independent claims. Advantageous embodiments of the invention are described in the dependent claims.
The improved concept is based on the idea of providing a device which, in the event of a short circuit in an on-load diverter switch of an on-load tap changer, allows the short circuit to be detected quickly enough and also commutates the rising short-circuit current to a resistor which limits the current to a permissible value before a critical value is reached, until a superordinate protection system, for example a power switch, triggers and separates the transformer from the transmission network.
According to a first aspect, the invention proposes a device for limiting a short-circuit current in an on-load tap changer, in particular in an on-load diverter switch of an on-load tap changer. The device has a first sensor for measuring a current in a first current line of the on-load tap changer, an interruption element, a control device and a current limiting element. The interruption element is arranged in a first current line of the on-load tap changer. The current limiting element is arranged in a parallel path in parallel with the interruption element, i.e. in parallel with the first current line. The first sensor is configured to transmit a first measurement signal to the control device, the first measurement signal representing a measured current in the first current line of the on-load tap changer. The current measurement and the transmission of the measurement signal can be carried out continuously or without interruption in time, preferably with a sampling rate of less than one microsecond. The transmission of the measurement signals to the control unit can be effected by radio, by optical waveguides or preferably by wires, particularly preferably by shielded wires.
The sensor is preferably designed as a current transformer. In principle, however, any type of sensor which can continuously measure the time profile of the current in the line and which is transmitted further to the control unit in the form of a measurement signal can be used for implementing the solution according to the invention.
The control device is preferably designed to detect and/or determine a time profile of the measurement signal which represents the measured current.
The first sensor can be arranged outside the housing of the respective transformer, the voltage of which is regulated by an on-load tap changer, preferably on the 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 the interruption element can interrupt the current guidance in the first current line of the on-load tap changer, so that the current guided in the first current line is commutated, i.e. transferred, to a parallel path in parallel with the current limiting element and is limited by the current limiting element.
According to an advantageous embodiment, the first current line electrically connects the selector, preferably the first movable selector contact, and the first main load branch of the load transfer switch, preferably the load tap changer, to one another.
According to one embodiment, the interruption element is arranged in a section of the first current line which is outside the on-load tap changer, i.e. outside the selector and the on-load changeover switch.
According to a further embodiment, the interruption element has a switching time for interrupting the current guidance which is shorter than 1.0ms, preferably shorter than 0.5ms and particularly preferably shorter than 0.1 ms. Due to the short reaction time of the interruption element, the rising short-circuit current commutates 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 in the transformer housing.
According to a further embodiment, the interruption element is designed as a semiconductor switching element or as an explosive or explosive charge or as a mechanical contact arrangement with an electromotive drive.
The semiconductor switching elements can be designed, for example, as IGBTs and/or thyristors. Explosives or explosives for separating electrical connections, such as cables or rails, are sufficiently known from the prior art. Suitable separating devices are, in particular, pyrotechnic cutting charges or detonators, as are described, for example, in EP 0052521 A1, as are known, for example, from the so-called "I" in medium-pressure applications s Limiters "are used for decades. The mechanical contact arrangement with the electromotive drive can be designed, for example, as described in DE 199 53 551C1 in the form of a contact ring system and can likewise be a possible device for interrupting the current supply in the first current line.
All these interruption elements have the advantage that they have a very short switching or actuation time in the range from 0.1 to 1.0 ms.
According to a preferred embodiment, the current limiting element is designed to a current intensity that corresponds to a multiple of the rated current, for example 2 times the rated current of the on-load tap changer. The rated current, which is also referred to as the rated through current in the relevant standard, is the current rated by the on-load tap changer in continuous operation. According to this preferred embodiment of the invention, the current limiting element of an on-load tap changer with a rated current of 800A is designed such that it can limit the short-circuit current to 1600A for a short time, for example, in a time period of 50ms.
The current limiting element can be designed as a resistor, for example an ohmic resistor, a cold conductor, a fuse with a fusible conductor, or as an inductor, in particular as a coil. As a resistor for the device, one of the transition resistors in an on-load diverter switch of the on-load tap changer can also be connected in parallel with the first current path.
According to a preferred embodiment, the device for limiting the current comprises, in addition to the first sensor, a second sensor for measuring the current in a second current line of the on-load tap changer. The second sensor is designed to transmit a second measurement signal to the control device, which second measurement signal represents the measured current in the second current line of the on-load tap changer. The second current line preferably electrically connects the selector, preferably the second movable selector contact, and the load transfer switch, preferably the second main load branch of the load transfer switch, to one another. The second sensor is preferably constructed analogously to the first sensor, and the second measurement signal is preferably constructed analogously to the first measurement signal. The second sensor may be arranged outside the transformer housing, in particular on the cover, or in the transformer housing.
According to an embodiment, the control device is configured to actuate the blocking element when both the first measurement signal and the second measurement signal are greater than or equal to a defined limit value.
The control device determines, on the basis of the first and second measurement signals, whether the measured current in the first current line and the measured current in the second current line both have reached or exceeded a limit value and, if this is the case, actuates the interruption element.
According to an embodiment of the invention, the specified limit value is a maximum value of the current, which is a multiple of the rated current of the on-load tap changer. Therefore, according to this embodiment of the invention, in an on-load tap changer with a rated current of, for example, 800A, the limit value is determined as a current maximum of 1600A. This means in particular that the interrupt element is actuated by the control device when a current of at least 1600A is measured not only in the first current line but also in the second current line.
According to a further embodiment, the specified limit value is the maximum change in current over a predetermined period of time. For example, according to this embodiment, in an on-load tap changer designed for a rated current of 800A, the limit value is 1.2A/μ s. This means in particular that the interrupt element is actuated by the control device when the current measured in the first and second current lines increases by a value of 1.2A or more within one microsecond. This has the advantage that the occurring short-circuit current can be detected more quickly, for example within one microsecond, since an abnormally rapid increase in the current is detected early by the sensor and the control device.
According to a second aspect, the invention proposes an on-load tap changer for uninterrupted switching between winding taps of a tap transformer. The on-load tap changer has a selector for power-free preselection to a selected winding tap, an on-load diverter switch for the actual load changeover from the winding tap up to now to the preselected winding tap, and a first current line which electrically connects the selector and the on-load diverter switch, preferably the first selector arm and the first main load branch to one another. Furthermore, the on-load tap changer according to the invention comprises a device for limiting a short-circuit current in an on-load tap changer, in particular in an on-load diverter switch of an on-load tap changer, which device is constructed according to the first aspect of the invention. With regard to the device, reference is made to the preceding statements, preferred features and/or advantages in a similar manner to what has been stated for the first aspect of the invention or one of the advantageous embodiments belonging thereto.
According to a preferred embodiment, the on-load tap changer comprises a second current line electrically connecting the selector and the on-load diverter switch, preferably the second selector arm and the second main load branch to each other. Furthermore, in this embodiment, the device comprises a second sensor for measuring the current in the second current line. The second sensor is configured to transmit a second measurement signal to the control device, the second measurement signal representing a measured current in the second current line of the on-load tap changer.
According to a third aspect, the invention proposes a method for limiting a short-circuit current in an on-load tap changer, in particular in an on-load diverter switch of an on-load tap changer, wherein the on-load tap changer is constructed according to the second aspect of the invention and comprises a device constructed according to the first aspect of the invention. The method comprises the following steps: measuring a current in a first current line of the on-load tap changer by means of a first sensor, transmitting a first measurement signal from the first sensor to a control device, the first measurement signal representing the measured current in the first current line of the on-load tap changer, actuating an interruption element, which is arranged in the first current line of the on-load tap changer, such that the current guidance in the first current 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 in parallel with the interruption element, in particular in a current path parallel to the first current line.
The steps of the method correspond to the features of the arrangement according to the first aspect of the invention and the features of the on-load tap changer according to the second aspect of the invention. Thus, for the method according to the third aspect of the invention, reference is made to advantageous elaborations, preferred features and/or advantages in a similar way as already elaborated for the arrangement according to the second and third aspect of the invention and the on-load tap changer.
According to a preferred embodiment of the method, the method comprises the further steps, according to which, in addition to the current measurement in the first current line, the current in the second current line of the on-load tap changer is measured by means of a second sensor, in addition to the first measurement signal, a second measurement signal is transmitted from the second sensor to the control device, which second measurement signal represents the measured current in the second current line of the on-load tap changer, and furthermore, the first and second measurement signals are compared by means of the control device with a defined limit value, and the interruption element is actuated when both the first measurement signal and the second measurement signal are greater than or equal to the defined limit value. For this preferred embodiment of the method, reference is made to the features and/or advantages explained, preferred, in a similar manner to what has been already explained for the corresponding advantageous embodiments of the device.
Further embodiments and implementations of the method result directly from the different embodiments of the device.
The invention will be explained in detail below by means of exemplary embodiments with reference to the drawings. All described and/or illustrated features form the subject matter of the invention both as such and in any combination, independently of their composition in the respective claims or their reference. Identical or functionally equivalent parts can be provided with the same reference numerals. Identical components or components having the same function may be explained only with reference to the figures in which they first appear. This explanation is not necessarily repeated in subsequent drawings.
Drawings
Here, there are shown:
fig. 1 shows an exemplary embodiment of an on-load tap changer in a schematic diagram;
fig. 2 schematically shows a first embodiment of the apparatus;
fig. 3 schematically shows a second embodiment of the apparatus;
fig. 4 schematically shows a third embodiment of the apparatus;
fig. 5 schematically shows a first embodiment of a method for limiting a short-circuit current;
fig. 6 shows a second embodiment of the method in a schematic view.
Detailed Description
An exemplary embodiment of an on-load tap changer 2 for a tap changer 20 is schematically shown in fig. 1. The tap transformer 20 has a main winding 25 and a tap N with different windings 1 、...、N J 、...、N N The winding taps of which are switched on or off by the on-load tap changer 2. For this purpose, the on-load tap changer 2 comprises a selector 11, which can be brought into contact with different winding taps N of the control winding 21 by means of two movable selector contacts, and an on-load changeover switch 8 1 、...、N J 、...、N N The load transfer switch performs the actual load transfer from the currently switched-on winding tap to the new preselected winding tap. In the position of the on-load changeover switch 8 shown in fig. 1, the load current is then equal toWinding tap N with front connection J+1 Through the corresponding selector contact and load transfer switch 8 to the load lead 12.
A first embodiment of the device according to the invention is schematically shown in fig. 2. The device 1 serves to limit the short-circuit current in the event of a fault in an on-load tap changer 2, in particular in an on-load changeover switch 8. The load changeover switch 8 has a plurality of switch contacts and resistors for changeover. However, the specific circuit arrangement of the on-load changeover switch is not important for the implementation of the invention, so that it is not discussed in more detail here. The on-load tap changer 2 comprises a selector 11 with two movable selector arms which each contact a winding tap N of a regulating winding of a tap transformer (not shown) J 、N J+1 . The device 1 comprises a first sensor 3 arranged in a first current line 4 and a second sensor 9 arranged in a second current line 10. The sensors 3, 9 serve to continuously measure the current flowing through the respective current line 4, 10 and to continuously transmit the measured current in the form of measurement signals M1, M2 to the 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 current line 4 connects the movable first selector contact of the selector 11 to the load changeover switch 8 of the on-load tap changer 2. Similarly, a second current line 10 connects a movable second selector contact of the selector 11 to the load changeover switch 8. An interruption element 5, which is designed as an IBGT switch 5 according to the first embodiment and is designed and operated in such a way that it can commutate a short-circuit current occurring in the event of a fault in the load changeover switch 8, is arranged in the first current line 4. When both the first measurement signal M1 and the second measurement signal M2 are greater than or equal to the specified limit values, the semiconductor switching element 5 is actuated by the control device 6. The current guidance in the first current line 4 is then interrupted by the semiconductor switching element 5, so that the current is commutated to the current limiting element 7. The current limiting element 7 is designed here, for example, as an ohmic resistor and is arranged in parallel with the semiconductor switching element 5 or in a current path 14 in parallel with the first current line 4 and is designed in such a way that itThe element can limit the rising short-circuit current for such a long time that the superordinate protection system, for example a power switch, is actuated and the associated tap changer, which is regulated by the on-load tap changer 2, is disconnected from the transmission network.
A second embodiment of the device according to the invention is schematically shown in fig. 3. With regard to the device 1 in fig. 3, reference is made in a similar manner to the previous explanation of the device in fig. 2 and only the differences with respect to the device in fig. 2 are discussed below. The device 1 in fig. 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 are known, for example, from DE 199 53 551C1. The switching unit comprises a contact ring system with an electromotive drive, which interrupts the current guidance in the first current line 4 in the event of a short circuit. For the commutation of the current, two parallel commutation paths are provided, for example, wherein the commutation path to which the current is finally commutated 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 the upper-level protection system is active.
A third embodiment of the device according to the invention is schematically shown in fig. 4. Fig. 4 shows in particular an exemplary spatial arrangement of the device 1 according to the invention. With regard to the device 1 in fig. 4, reference is made in a similar manner to the previous explanations of the device 1 in fig. 3 and 4 and only the differences and supplementary features are discussed next. The device 1 limits the short-circuit current in the event of a fault of the on-load tap changer 2, which regulates the voltage ratio of the tap transformer 20. The tap changer 20 has a housing 23, in particular a tank, with a cover 24. The on-load tap changer 2 is arranged below the cover 24 of the transformer, wherein the selector 11 is spatially below the on-load changeover switch 8. The first sensor 3 arranged in the first current line 4 and the interruption element 5, which is designed here as an explosive charge in the form of a detonator by way of example, are attached to the cover 20 outside the transformer housing 23. The first current line 4 is tapped from the contact winding by N J First selector contacts (not shown) are guided via in each case one feedthrough 22 from the interior of the housing 23 to the outside or from the outside to the inside and finally to the interiorInto the load transfer switch 8. The sensor 3 and the interruption element 5 are arranged between the feedthroughs 22. The feedthrough 22 may be, for example, a standard feedthrough designed according to the DIN standard for applications in the 4kV range. A resistor 7 is arranged in parallel with the first current line 4, which resistor is located in the transformer housing 23. Alternatively, one of the transition resistors in the load changeover switch 8 can also be used as the current limiting element 7 and be connected in parallel with the first current line 4. A second sensor 9 is arranged in a second current line 10, which is routed via the contact winding tap N, in a section outside the load changeover switch 8 and the selector 11 J+1 A second selector contact (not shown) leads into the load changeover switch 8. The second sensor 9 is thus located within the transformer housing 23. However, it is also possible to mount the sensor 9 outside the transformer housing 23, for example on the cover 24, and to this end to guide the second current line 10 through the feedthrough 22 from the inside of the housing 23 to the outside or from the outside to the inside. The load current is transmitted from the load changeover switch 8 via the further feedthroughs 22 from the inside to the outside to the load line 12.
Fig. 5 schematically shows a first specific embodiment of a method for limiting the short-circuit current. In this embodiment, the device 1 comprises a first sensor 3, an interruption element 5, a current limiting element 7 and a control means 6. The method illustratively has steps 100, 200, and 500 that are sequential to one another.
In step 100, the current in the first current line of the on-load tap changer is measured by means of a first sensor. In a next step 200, a first measurement signal is transmitted from the first sensor to the control device, the first measurement signal representing a measured current in a first current line of the on-load tap changer. In a further following step 500, the interruption element arranged in the first current line of the on-load tap changer is actuated by the control device in such a way that the current guidance in the first current line of the on-load tap changer is interrupted and the current is commutated to the current limiting element.
A second embodiment of the method is schematically illustrated in fig. 6. In this embodiment, the device 1 additionally comprises a second sensor 9. The method has the exemplary steps 100, 101, 200, 201, 300, 301 and 400, steps 100 and 200 being identical to steps 100 and 200 in fig. 5. The method of fig. 6 additionally comprises a step 101, according to which, in addition to the measurement of the current in the first current line in step 100, the current in the second current line of the on-load tap changer is also measured by means of a second sensor. In a next step 201 following step 101, in addition to the transmission of the first measurement signal in step 200, a second measurement signal is transmitted from the second sensor to the control device, which second measurement signal represents the measured current in the second current line of the on-load tap changer. In a further step 300 following step 200, the first measurement signal is compared with a defined limit value by means of the control device. When the first measurement signal is equal to or greater than the specified limit value (indicated by "yes" in fig. 6), the second measurement signal is also compared with the specified limit value by means of the control device in step 301. If the second measurement signal is also greater than or equal to the specified limit value (indicated by "yes" in fig. 6), the interrupt element is actuated by the control device in a next step 400.
In the event that in step 300 it is determined that the first measurement signal is below the specified limit value (indicated by "no" in fig. 6), steps 100 and 101 are carried out again. The interruption element is not actuated.
In the case of a determination in step 301 that the second measurement signal is below the specified limit value (indicated by "no" in fig. 6), step 100 and step 101 are carried out again. The interruption element is not actuated.
As an alternative to the sequence in which step 301 is carried out after step 300, it is also possible to first compare the second measurement signal with a limit value and subsequently compare the first measurement signal with a limit value.
List of reference numerals
1. Device
2. On-load tap-changer
3. First sensor
4. First current line
5. Interrupt element
6. Control device
7. Current limiting element
8. On-load change-over switch
9. Second sensor
10. Second current line
11. Selector device
12. Load lead
13. Signal connection
14. Current path
20. Tapping transformer
21. Regulating winding
22. Piercing part
23. The 20 shell
24. The cover of 20
25. Main winding
(N 1 、…、N J 、…、N N ) Winding tap
M1, M2 measurement signals
100. Method step
101. Method step
200. Method step
201. Method step
300. Method step
301. Method step
400. Method step
500. The method comprises the following steps.
Claims (13)
1. A device (1) for limiting short-circuit current in an on-load tap changer (2), in particular for limiting short-circuit current in an on-load diverter switch (8) of an on-load tap changer (2), comprising:
-a first sensor (3) for measuring a current in a first current line (4) of the on-load tap changer (2),
-an interruption element (5),
-a control device (6), and
a current limiting element (7),
wherein,
-an interruption element (5) is arranged in a first current line (4) of the on-load tap changer (2),
-a current limiting element (7) is arranged in parallel with the interruption element (5),
the first sensor (3) is designed to transmit a first measurement signal M1 to the control device (6), said first measurement signal representing a measured current in a first current line (4) of the on-load tap changer (2),
the interruption element (5) can be actuated by the control device (6) in such a way that the interruption element can interrupt the current guidance in the first current line (4) of the on-load tap changer (2), so that the guided current is commutated to the current limiting element (7).
2. Device (1) according to the preceding claim, wherein the interruption element (5) has a transition time for interrupting the current guidance of less than 1 millisecond.
3. Device (1) according to one of the preceding claims, wherein the interruption element (5) is configured as a semiconductor switching element, or as an explosive or explosive substance, or as a mechanical contact assembly with an electromotive drive.
4. Device (1) according to claim 1, wherein the current limiting element (7) is designed to a current intensity which is equal to a multiple of the rated current of the on-load tap changer (2).
5. Device (1) according to the preceding claim, wherein the current limiting element (7) is configured as a resistor or the current limiting element is configured as an inductor, in particular the current limiting element is configured as a coil.
6. The device (1) according to any one of the preceding claims, wherein the device (1) has a second sensor (9) for measuring the current in a second current line (10) of the on-load tap changer (2), which second sensor is configured for transmitting a second measurement signal M2 to the control means (6), which second measurement signal represents the measured current in the second current line (10) of the on-load tap changer (2).
7. The device (1) according to the preceding claim, wherein the control means (6) are configured for operating the interruption element (5) when both the first measurement signal M1 and the second measurement signal M2 are greater than or equal to a defined limit value.
8. The device (1) according to the preceding claim, wherein the prescribed limit value is a maximum value of the current, which is a multiple of the rated current of the on-load tap changer (2).
9. Device (1) according to claim 7, wherein the prescribed limit value is the maximum change in current over a predetermined period of time.
10. A method for tapping (N) windings of a tap transformer (20) 1 、...N J 、...、N N ) An on-load tap changer (2) for switching between said on-load tap changer and said on-load tap changer, said on-load tap changer comprising:
-a selector (11) for the powerless preselection of the selected winding tap (N) J ) In the above-mentioned order of magnitude,
-an on-load transfer switch (8) for tapping (N) from the winding up to now J-1 ) To preselected winding tap (N) J ) The actual load of the load is switched over,
-a first current line (4) electrically connecting the selector (11) and the load transfer switch (8) to each other,
-a device (1) constructed according to claim 1.
11. On-load tap changer (2) according to the preceding claim,
-the on-load tap changer (2) comprises a second current line (10) electrically connecting the selector (11) and the on-load transfer switch (8) to each other,
the device (1) has a second sensor (9) for measuring the current in a second current line (10), which is designed to transmit a second measurement signal M2, which represents the measured current in the second current line (10) of the on-load tap changer (2), to the control device (6).
12. Method for limiting a short-circuit current in an on-load tap changer (2), in particular for limiting a short-circuit current in an on-load diverter switch (8) of an on-load tap changer (2), which is an on-load tap changer constructed according to one of the preceding claims 10 or 11 and which comprises a device (1) constructed according to one of the preceding claims 1 to 9, comprising the method steps of:
-100: measuring the current in a first current line (4) of the on-load tap changer (2) by means of a first sensor (3),
-200: transmitting a first measurement signal M1 from the first sensor (3) to the control device (6), said first measurement signal representing a measured current in a first current line (4) of the on-load tap changer (2),
-500: an interruption element (5) arranged in a first current line (4) of the on-load tap changer (2) is actuated in such a way that a current guidance in the first current line (4) of the on-load tap changer (2) is interrupted and a current is commutated to a current limiting element (7).
13. The method according to the preceding claim, wherein,
-in a step (101), in addition to measuring the current in the first current line (4), measuring the current in a second current line (10) of the on-load tap changer (2) by means of a second sensor (9),
-in a step (201), in addition to the transmission of the first measurement signal M1, a second measurement signal M2 is transmitted by the second sensor (9) to the control device (6), said second measurement signal representing the measured current in the second current line (10) of the on-load tap changer (2),
-in a step (300), the first measurement signal M1 is compared with a defined limit value by means of a control device (6),
-in a step (301), the second measurement signal M2 is compared with a defined limit value by means of the control device (6),
in a step (400), the interruption element (5) is actuated when both the first measurement signal M1 and the second measurement signal M2 are greater than or equal to a defined limit value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020110935.0 | 2020-04-22 | ||
| DE102020110935.0A DE102020110935B3 (en) | 2020-04-22 | 2020-04-22 | DEVICE AND METHOD FOR LIMITING A SHORT-CIRCUIT CURRENT IN A LOAD TAP SWITCH AND ONCE TAP SWITCH WITH THIS DEVICE |
| PCT/EP2021/057513 WO2021213769A1 (en) | 2020-04-22 | 2021-03-24 | Device for limiting a short-circuit current in an on-load tap-changer, and on-load tap-changer having said device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115443514A true CN115443514A (en) | 2022-12-06 |
Family
ID=75302536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180028918.5A Pending CN115443514A (en) | 2020-04-22 | 2021-03-24 | Device for limiting short-circuit current in an on-load tap changer and on-load tap changer with said device |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4111480B1 (en) |
| JP (1) | JP2023523184A (en) |
| CN (1) | CN115443514A (en) |
| DE (1) | DE102020110935B3 (en) |
| WO (1) | WO2021213769A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295971B (en) * | 2021-12-30 | 2024-05-28 | 国网河北省电力有限公司电力科学研究院 | On-load tap-changer state detection device, method and control equipment |
| DE102023108835B3 (en) | 2023-04-06 | 2024-06-06 | Maschinenfabrik Reinhausen Gmbh | ON-LOAD TAP-CHANGER AND METHODS OF OPERATING IT |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH404804A (en) * | 1962-05-17 | 1965-12-31 | Reinhausen Maschf Scheubeck | Switching arrangement for diverter switches of tap changers in regulating transformers |
| DE2207367C2 (en) * | 1972-02-17 | 1974-02-28 | Reinhausen Maschf Scheubeck | Arrangement to prevent step short circuits in diverter switches of step transformers with anti-parallel connected thyristors |
| US4184186A (en) * | 1977-09-06 | 1980-01-15 | General Electric Company | Current limiting device for an electric power system |
| DE3171841D1 (en) | 1980-11-19 | 1985-09-19 | Qed Design & Dev Ltd | Linear shaped charges |
| US5689395A (en) * | 1995-09-14 | 1997-11-18 | Raychem Corporation | Overcurrent protection circuit |
| DE19953551C1 (en) | 1999-11-08 | 2001-08-16 | Abb Hochspannungstechnik Ag Zu | Fast current limiting switch |
| WO2006083334A1 (en) * | 2005-01-31 | 2006-08-10 | Georgia Tech Research Corporation | Active current surge limiters |
| DE102012109174A1 (en) * | 2012-09-27 | 2014-03-27 | Maschinenfabrik Reinhausen Gmbh | On-load tap-changer with selection |
| DE102015106178A1 (en) * | 2015-04-22 | 2016-10-27 | Maschinenfabrik Reinhausen Gmbh | OLTC |
| DE102016120070A1 (en) * | 2016-10-21 | 2018-04-26 | Eaton Industries (Austria) Gmbh | Low-voltage protection device |
-
2020
- 2020-04-22 DE DE102020110935.0A patent/DE102020110935B3/en active Active
-
2021
- 2021-03-24 EP EP21715521.7A patent/EP4111480B1/en active Active
- 2021-03-24 CN CN202180028918.5A patent/CN115443514A/en active Pending
- 2021-03-24 WO PCT/EP2021/057513 patent/WO2021213769A1/en unknown
- 2021-03-24 JP JP2022562322A patent/JP2023523184A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP4111480C0 (en) | 2024-05-08 |
| EP4111480B1 (en) | 2024-05-08 |
| JP2023523184A (en) | 2023-06-02 |
| EP4111480A1 (en) | 2023-01-04 |
| DE102020110935B3 (en) | 2021-07-01 |
| WO2021213769A1 (en) | 2021-10-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4884164A (en) | Molded case electronic circuit interrupter | |
| US5206616A (en) | Switching device for the interruption of fault currents | |
| CN114365255A (en) | Protection switch device, protection switch system and method | |
| RU2289175C2 (en) | Interrupter control and protective module | |
| CN115443514A (en) | Device for limiting short-circuit current in an on-load tap changer and on-load tap changer with said device | |
| HU203425B (en) | Arrangement for realizing switch of load of a ratio switch for switching regulating coil of transformer | |
| US3622867A (en) | Load tap changer system including protective apparatus for monitoring the operation thereof | |
| US5898556A (en) | Protection system for a three-phase distribution transformer insulated in a liquid dielectric | |
| KR100248253B1 (en) | Switching arrangement for load change-over switches of step switches and for selector switches | |
| CN114175197B (en) | Pressure pulse diagnostics for on-load tap changers | |
| US4061963A (en) | Load tap changer system | |
| CN109417282B (en) | Semiconductor cutting apparatus | |
| ATE44192T1 (en) | FISH PROTECTION SWITCH|T DESIGNED AS A PLUG. | |
| EA002377B1 (en) | Immersed transformer self-protected by a device including a circuit breaker and fuses | |
| CN110506376B (en) | Electrical switching apparatus | |
| US4041540A (en) | Solid state overload relay circuit | |
| KR20150010958A (en) | Actuator circuit for control of circuit breaker | |
| EP1050059B1 (en) | Instantaneous trip power transformer | |
| JP2677584B2 (en) | High current switch | |
| US3366848A (en) | High energy supply and interlocking for plural solenoids | |
| CN102208771B (en) | Switching device and interlock test method thereof | |
| US6728087B1 (en) | Method and apparatus for remotely actuating a circuit protection device | |
| CN114127878A (en) | On-load tap-changer | |
| RU2189680C2 (en) | Factory-assembled switch gear | |
| GB2120477A (en) | Protecting against current loading and short-circuiting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |