EP3427284A1

EP3427284A1 - On-load tap changer

Info

Publication number: EP3427284A1
Application number: EP17709649.2A
Authority: EP
Inventors: Markus Meyer; Christian Kotz
Original assignee: Maschinenfabrik Reinhausen GmbH; Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
Current assignee: Maschinenfabrik Reinhausen GmbH; Scheubeck GmbH and Co
Priority date: 2016-03-11
Filing date: 2017-03-08
Publication date: 2019-01-16
Anticipated expiration: 2037-03-08
Also published as: MX2018010951A; US11004622B2; EP3427284B1; CN108431920B; JP7000332B2; ZA201804551B; US20190066940A1; KR20180120165A; EP3427284C0; DE102016104500B3; AU2017229282A1; JP2019509592A; AU2017229282B2; KR102446586B1; CN108431920A; WO2017153448A1; PL3427284T3; BR112018016933A2; ES2960327T3; HRP20231216T1

Abstract

A resistor-type on-load tap changer (1) comprises: - a selector base plate (21); - a selector (20) mounted on the selector base plate (21); - a load transfer switch base plate (41); - a load transfer switch (40) that is mounted on the load transfer switch base plate (41) and includes a transfer resistor (53); - a common input shaft (10) that actuates the selector (20) and the load transfer switch (40).

Description

LAST STEP SWITCH

The invention relates to an on-load tap changer according to the resistance principle.

On-load tap-changers according to the resistance principle are basically based on two alternative basic principles. Either as a so-called load selector or as a diverter switch with a selector. DE 10 2013 107 545 A1 describes a load selector which performs the selection of the desired, new stage contact and the switchover from the current-current, old stage contact to the new stage contact in one go under load. In this case, the change-over performing diverter switch insert, on which the vacuum interrupters, the movable contacts and the resistors are mounted, rotatably disposed in a sealed oil vessel.

DE 25 29 381 C3 describes an on-load tap-changer, in which first the dialing without load takes place relatively slowly by a selector and then the switching as fast as possible under load by a diverter switch. Selector and diverter switch are two spatially separated units. The diverter switch with its over- resistances and switching contacts is housed in a separate and sealed oil tank. The selector, which consists of a construction of insulating bars held by two cage rings, is located below the diverter switch in the transformer housing. Both the load selector and the diverter switch with selector function according to the resistance switching principle, according to which the circulating current which flows during the switching during the simultaneous simultaneous contacting of the old and new tap contact is limited by being guided by ohmic resistors. The longer the circulating current flows through the resistors, the more they heat up. For this reason, in the on-load tap-changers of the prior art, the switching is carried out as quickly as possible with the help of spring energy storage, which were previously raised by a motor drive.

Against this background, the invention proposes the subject matter of the independent claim. Advantageous embodiments of the invention are described in the dependent claims.

The invention proposes an on-load tap changer according to the resistance principle, comprising - a voter base plate;

a diverter switch base plate;

a selector mounted on the selector base plate;

a diverter switch comprising a transient resistor and mounted to the diverter switch base plate,

- A common drive shaft which actuates and / or drives the selector and the diverter switch.

The on-load tap-changer is cost-effective in production due to the plate design, easy to install and safe to operate. Here, the diverter switch is mounted with all its parts on the diverter switch base plate and the voter with all its parts on the voter base plate. The drive shaft actuates and / or drives the diverter switch and the selector in common. Due to the particularly simple structure, it is possible to variably arrange both the selector and the diverter switch of a phase, as well as the respective phases among themselves, at a distance from each other, depending on the voltage requirements.

In this case, the selector base plate and the diverter switch base plate may be formed as desired in any manner, for example, an insulating material such as an insulating material. Plastic or fiber-reinforced plastic, in particular a mixture of polyamide or polyphthalamide with glass fibers. Preferably, the diverter switch base plate is arranged parallel to the selector base plate.

The drive shaft can be formed as desired in any manner, for example, such that it is constructed from one piece or from several parts.

Furthermore, the on-load tap changer can have a preselector which is likewise actuated and / or driven by the common drive shaft. The preselector serves to switch a control winding in the same direction or in the opposite direction to a main winding. The selection can be arranged on the selector base plate, on-load tap-changer baseplate or a separate selection baseplate.

The drive shaft can be driven directly by an electric motor. Between the electric motor and the drive shaft, a spring energy storage or an intermediate gear can be arranged.

It may be specified that the on-load tap-changer comprises a rod mechanically connecting the selector base plate and the diverter switch base plate together.

In this case, at least one additional rod or alternatively or in addition to the rods at least one spacer and / or at least one plate can be used. The connection can also be realized by means of spacers which are sprayed onto the selector base plate and / or the diverter switch base plate.

It may be specified that the on-load tap-changer comprises

on a first side of the selector baseplate, a first driver;

- On a second, opposite side of the voter base plate, a second driver; in which

- The drive shaft actuates and / or drives the two drivers.

It may be specified that the on-load tap-changer comprises

- On the first page of the voter base plate a first Maltese wheel;

- On the second page of the voter base plate, a second Maltese wheel;

- Several fixed contacts on the first and second side of the selector base plate;

a first moving contact mechanically connected to the first Geneva wheel and selectively connectable to each of the fixed contacts on the first side;

- A second moving contact, which is mechanically connected to the second Geneva wheel and can be selectively connected to each of the fixed contacts on the second side.

It may be specified that

- The fixed contacts extend from the first page through the selector base plate to the second side.

It may be specified that the on-load tap-changer comprises

a cam on a first side of the diverter switch base plate;

a first gear on a second, opposite side of the diverter switch base plate;

in which

- The drive shaft, the cam and the first gear operated and / or drives. It may be specified that the on-load tap-changer comprises

- On the first page of diverter switch base plate a vacuum interrupter with a Fixed contact and a moving contact;

in which

a tilting lever is arranged between the moving contact and the cam disc,

- By moving the cam disc, the moving contact of the vacuum interrupter is actuated via the rocker arm.

It may be specified that the on-load tap-changer comprises

on the second side of the diverter switch base plate, a switching resistor and a switching element;

- Between the first gear and the switching element, a second gear with a connecting rod;

in which

- By turning the first gear, the switching element via the second gear and the connecting rod is actuated.

The arrangement of the individual parts, in particular vacuum interrupter, resistor and switching element can be distributed as required to the first and / or the second side of the diverter switch base plate. Also, the operation of the vacuum interrupter and the switching element can be done directly or via gears, Geneva wheels or connecting rods.

It may be specified that the on-load tap-changer comprises

- two more voters and two more diverter switches;

in which

- The drive shaft also drives the other voters and the other diverter switch.

Preferably, the other voters such as the selector and / or the two other diverter switch are designed as the diverter switch. It may be specified that the on-load tap-changer comprises

- For each selector and diverter switch, a selection mounted on a selection base plate or on the respective selector base plate or on the respective diverter switch base plate and is directly or indirectly operated and / or driven by the drive shaft. Preferably, each selection base plate is arranged parallel to the respective selector base plate and / or the respective diverter switch base plate.

It may be specified that - At least one of the selector and at least one of the diverter switch and at least one of the optionally present preselector of at least one phase of a transformer are assigned.

It may be specified that the on-load tap-changer comprises

- A bar that mechanically connects the voter base plates, the diverter switch base plates and the optional selector base plates to each other.

In this case, at least one additional rod or alternatively or in addition to the rods at least one spacer and / or at least one plate can be used. The connection may also be realized by means of spacers sprayed onto the selector baseplates and / or the diverter switch base plates and / or the selector baseplates.

Embodiments of the invention will now be described by way of example with reference to the accompanying drawings. However, the individual features resulting therefrom are not limited to the individual embodiments, but can be connected and / or combined with individual features described above and / or with individual features of other embodiments. The details in the drawings are to be interpreted as illustrative, but not restrictive. The reference signs contained in the claims are not intended to limit the scope of the invention in any way, but merely refer to the embodiments shown in the drawings.

The drawings show in

FIG. 1 shows a first embodiment of a three-phase on-load tap-changer after

Resistance principle;

FIG. FIG. 2 shows a first side of one of the selectors of the on-load tap-changer formed according to a preferred embodiment; FIG.

FIG. 3, a second side of the selector;

FIG. 4 the first page of the voter, with a wheel of Maltese removed;

FIG. FIG. 5 shows a first side of one of the load changeover switches of the on-load tap-changer formed in accordance with a preferred embodiment; FIG.

FIG. 6, a second side of the diverter switch; FIG. 7 the selector and the diverter switch in assembled condition;

FIG. 8 shows a second embodiment of a three-phase on-load tap-changer according to the resistance principle.

In FIG. 1 is a schematic representation of a first embodiment of an on-load tap-changer 1 according to the resistance principle. The on-load tap-changer 1 here has three selectors 20 and three load changeover switches 40. Each selector 20 and each diverter switch 40 is associated with a particular phase of a tapped transformer (not shown). A single-phase variant of the on-load tap-changer 1 according to the invention would therefore have only one load changeover switch 40 and only one selector 20. Each selector 20 is mounted on a selector base 21 and each diverter switch 40 on a diverter switch base 41. The individual plates 21, 41 are pushed onto at least one rod 15 and are held over this. The attachment of the individual plates 21, 41 can also be done in other ways, e.g. About spacers, sprayed bars or other plates. A common drive shaft 10 drives all the selectors 20 and diverter switch 40. In this embodiment, the drive shaft 10 extends through the individual plates 21, 41 to actuate the selectors 20 and the diverter switches 40. The drive shaft 10 is preferably actuated via a bevel gear 12 by a motor 13. However, the drive shaft 10 may also be formed directly actuated by a motor 13. By the common drive shaft 10, the selector 20 and the diverter switch 40 are operated such that a load switching is performed by a tap tap to an adjacent stage tap.

The arrangement of the selector 20 and the diverter switch 40 on individual, separate plates 21, 41 and by the drive via a common drive shaft 10, it is possible lent, both the selector 20 and the diverter switch 20 a phase, as well as the phases below at a certain distance from each other, depending on the voltage requirements, to arrange variably. In this case, the drive shaft 10 may be formed from one or more parts.

In FIG. 2 and FIG. 4 shows one of the selectors 20 of the on-load tap-changer 1 designed according to a preferred embodiment. The voter base plate 21 is preferably made of an insulating material such as plastic or fiber reinforced plastic (eg, a mixture of polyamide or polyphthalamide with glass fibers). The selector base plate 21 has a first side 22 and a second, opposite side 32 on. On the first side 22 a plurality of fixed contacts 18 are arranged, which are connected via lines 19 with winding taps of a control winding of the tapped transformer. The fixed contacts 18 extend from the first side 22 through the selector base plate 21 to the second side 32. The fixed contacts 18 are preferably made of copper and are additionally silvered. Furthermore, a first Geneva wheel 25 with a first movably mounted moving contact 23 is mounted on the first side 22. The first Geneva wheel 25 is rotatably mounted about an axis 1 1 on a first bearing axis 26. The bearing axis 26 is formed as a separate part mechanically connected to the selector base plate 21. However, the bearing axis 26 can be sprayed with in the manufacture of the selector base plate 21 and formed with this as a unit. In addition to the first Geneva wheel 25, a first driver 27 is arranged, which is actuated via the drive shaft 10 which extends through the selector base plate 20. In this case, the first driver 27, a first cam 28 which engages in the first Geneva wheel 25 and this rotates. Upon actuation of the selector 20, the first driver 27 is rotated 360 °. When interacting with the first Geneva wheel 25, the first Geneva wheel 25 is turned only piecemeal, that is, by the fraction of a complete rotation with a complete rotation of the first driver 27. By the combination of the first driver 27 and the first Geneva wheel 25, the continuous rotational movement of the first driver 27 is converted into a stepwise or piecewise rotation of the first Geneva wheel 25. The combination of a Maltese wheel and a driver allows even in the idle state, ie before or after the operation of the voter, a blocking function of both parts against each other.

Prior to the actuation of the first Geneva wheel 25, the first moving contact 23 always contacts one of the fixed contacts 18 and electrically conductively connects them to a terminal 29 of a first branch of the diverter switch 40. When the selector 20 is actuated, the first Geneva wheel 25 is rotated and the first moving contact is thereby produced 23 switched from this fixed contact 18 to a neighboring fixed contact 18.

The contacting of each fixed contact 18 takes place on the first side 22 at a first contact region 24 via the first moving contact 23.

In FIG. 3, the second side 32 of the selector 20 is shown. Again, the fixed contacts 18 are connected via lines 19 with winding taps of the control winding of the tapped transformer. Furthermore, on the second side 32, a second Maltese wheel Mounted 35 with a second moving contact 33. The second Geneva wheel 35 is also rotatably mounted about the axis 1 1 on a second bearing axis 36. A second driver 37 is disposed adjacent to the second Geneva wheel 35 and is actuated by the same drive shaft 10 as the first driver 27. In this case, the second driver 37, a second cam 38 which engages in the second Geneva wheel 35 and this rotates.

The first cam 28 is arranged offset to the second cam 38 and the drivers 27, 37 and thus the cams 28, 38 are arranged offset. When the drive shaft 10 is rotated, the staggered arrangement of the cams 28, 38 or drivers 27, 37 results in a time-shifted actuation of the Geneva wheels 25, 35 and thus of the moving contacts 23, 33.

Prior to the actuation of the second Geneva wheel 35, the second moving contact 33 always contacts one of the fixed contacts 18 and electrically conductively connects it to a terminal 39 of a second branch of the diverter switch 40. When the selector 20 is actuated, the second Geneva wheel 35 is rotated, thereby causing the second moving contact 33 switched from this fixed contact 18 to a neighboring fixed contact 18. In this embodiment, prior to the start of the operation of the selector 20, ie in the stationary state, the moving contacts 23, 33 contact the same fixed contact 18. However, this may vary depending on the circuit. The contacting of each fixed contact 18 takes place on the second side 32 at a second contact region 34 via the second moving contact 33.

In FIG. FIG. 5 illustrates one of the load changeover switches 40 of the on-load tap-changer 1 designed in accordance with a preferred embodiment. The diverter switch base plate 41 is preferably made of an insulating material such as plastic or fiber reinforced plastic (eg, a mixture of polyamide or polyphthalamide with glass fibers) and has a first side 42 and a second, opposite side 52. On the first side 42 a vacuum interrupter 43 is arranged, which is fastened by means of holders 44 to the diverter switch base plate 41. The vacuum interrupter 43 comprises a fixed contact 45 and a moving contact 46, via which the vacuum interrupter 43 is opened or closed. Furthermore, a cam disk 47 is mounted on the first side 42. Between the cam plate 47 and the moving contact 46, a rocker arm 48 is rotatably mounted such that upon rotation of the cam plate 47, one end 50 of the rocker arm 48 a contour 49 of the cam 47 leaves and thereby the vacuum interrupter 43 is actuated, that closes or opens via the moving contact 46 , The moving contact 46 is guided during actuation in a holder. In FIG. 6, the second side 52 of the diverter switch 40 is shown. On the second side 52, a resistor 53 is arranged. Furthermore, a first gear 54, which corresponds to the cam disk 47 on the first side 42, rotatably supported on the second side 52. In the example shown here, the drive shaft 10 passes through the cam disk 47, the diverter switch base plate 41 and the first gear 54 and drives the cam disk 47 and the first gear 54. Furthermore, a switching element 55, which is driven via a combination of a second gear 56 and a connecting rod 57, mounted on the second side 52. By actuating the drive shaft 10, the switching element 55 is actuated via the individual gears 54, 56 and the connecting rod 57. Here, therefore, the rotational movement of the drive shaft 10 is converted into a linear movement of the switching element 55. The switching element 55 is designed as a bridging switch. The switching element 55 may also be designed as a rotary switch.

The arrangement of the individual parts, in particular the vacuum interrupter, the resistor and the switching element, can be distributed as required to the first and / or the second side of the diverter switch base plate. The operation of the vacuum interrupter and the switching element can be done via gears, Geneva wheels, connecting rods.

In FIG. 7, the selector 20 and the selector base 21 of FIG. 2 and 3 and the diverter switch 40 and diverter switch base 41 of FIG. Figures 5 and 6 associated with a phase are shown assembled. In this case, the voter base plate 21 is connected via two rods 15 to the diverter switch base plate 41. The drive shaft 10 passes through the drivers 27, 37, the cam plate 47 and the two base plates 21, 41st

In FIG. 8, a second embodiment of the on-load tap-changer 1 is shown schematically. In this embodiment, the on-load tap-changer 1 has a preselector 60 for each phase, which is also actuated by the common drive shaft 10. The preselector 60 serves to switch a control winding of the respective phase in the same direction or in the opposite direction to a corresponding main winding. Each preselector 60 is mounted on a separate preselector base plate 61, but may also be mounted on the selector base plate 21 or the on-load tap-changer base plate 41 of the respective phase as needed. The operation of the preselector 60 can be done directly via the drive shaft 10 or indirectly, for example via a transmission. REFERENCE NUMBERS

1 on-load tap-changer

10 drive shaft

1 1 axis

12 bevel gear

13 engine

15 staff

18 fixed contact

19 lines

20 voters

21 voter base plate

22 first page of 21

23 first moving contact

24 first contact area

25 first Maltese wheel

26 first bearing axis

27 first driver

28 first cam

29 connection of 40

32 second page of 21

33 second moving contact

34 second contact area

35 second Maltese wheel

36 second bearing axis

37 second driver

38 second cam

39 connection of 40

40 diverter switch

41 diverter switch base plate

42 first page of 41

43 vacuum interrupter

44 holders

45 fixed contact of 43

46 moving contact of 43

47 cam disc rocker arm

contour

The End

second page of 41

Overload resistor first gear

Switching element second gear

pleuel

selection

Vorwählergrundplatte

Claims

1 . On-load tap-changer (1) according to the resistance principle, comprising

a selector base plate (21);

a selector (20) mounted on the selector base plate (21);

a diverter switch base plate (41);

a diverter switch (40) mounted on the diverter switch base plate (41) and comprising a switching resistor (53),

- A common drive shaft (10) which actuates the selector (20) and the diverter switch (40).

2. on-load tap-changer (1) according to the preceding claim, comprising

- On a first side (22) of the selector base plate (21) has a first driver (27);

- On a second, opposite side (32) of the selector base plate (21) has a second driver (37);

in which

- The drive shaft (10) the two drivers (27, 37) operated.

3. on-load tap-changer (1) according to one of the preceding claims, comprising

- On the first side (22) of the selector base plate (21) a first Geneva wheel (25);

- on the second side (32) of the selector base plate (21) a second Geneva wheel (35);

- a plurality of fixed contacts (18) on the first and second sides (22, 32) of the selector base plate (21);

- a first moving contact (23) mechanically connected to the first Geneva wheel (25) and selectively connectable to each of the fixed contacts (18) on the first side (22);

- A second moving contact (33) which is mechanically connected to the second Geneva wheel (25) and optionally with each of the fixed contacts (18) on the second side (32) can be connected.

4. on-load tap-changer (1) according to the preceding claim, wherein

- The fixed contacts (18) extend from the first side (22) through the selector base plate (21) to the second side (32).

5. on-load tap-changer (1) according to one of the preceding claims, comprising

- A cam disc (52) on a first side (42) of the diverter switch base plate (41);

a first gear (54) on a second, opposite side (52) of Diverter switch base plate (41);

in which

- The drive shaft (10), the cam disc (47) and the first gear (54) actuated.

6. on-load tap-changer (1) according to one of the preceding claims, comprising

- On the first side (42) of the diverter switch base plate (41) has a vacuum interrupter (43) with a fixed contact (45) and a moving contact (46);

in which

- Between the moving contact (46) and the cam disc (47) a rocker arm (48) is arranged;

- By moving the cam disc (47) of the moving contact (46) of the vacuum interrupter (43) via the rocker arm (48) is actuated.

7. on-load tap-changer (1) according to one of the preceding claims, comprising

on the second side (52) of the diverter switch base plate (41), a transfer resistor (53) and a switching element (55);

- between the first gear (54) and the switching element (55), a second gear (56) with a connecting rod (57);

in which

- By turning the first gear (54), the switching element (55) via the second gear (56) and the connecting rod (57) is actuated.

8. on-load tap-changer (1) according to one of the preceding claims, comprising

- Two more selector (20) and two other diverter switch (40);

in which

- The drive shaft (10), the selector (20) and the diverter switch (40) drives.

9. on-load tap-changer (1) according to one of the preceding claims, comprising

for each selector (20) and diverter switch (40), a preselector (60) mounted on a preselector base plate (61) or on the respective selector base plate (21) or on the respective diverter switch base plate (41) and on the drive shaft (10). is pressed.

10. On-load tap-changer (1) according to the preceding claim, comprising

a rod (15) mechanically interconnecting the selector base plates (21), the diverter switch base plates (41) and the selector base plates (61).