JPH0143443B2 - - Google Patents

Abstract

1. Tap switch for tapped transfomers with tap selector (1) constructed as cylindrical rod cage and a reverser (3), which is arranged laterally of the tap selector (1) and consists of a lower arm (20) and an upper arm (19), which are each connected with the cage rings (5, 6) of the tap selector (1) and have insulating roods (21, 22) fastened thereat, which carry the fixed reverser contacts (23, 24), and of a switching shaft (25), which is borne in the arms (19, 20) carried the movable reverser contacts (26) and which is actuable by means of a first fork (30), which is borne at the upper cage ring (6) and into which engages a dog (33) sitting on a drive sheave (13) of the selector (1), wherein polarity contacts (37) the movable contacts (38) of which are actuable together with the reverser contacts (26), for the tying of a centre tap of the cap winding to a certain potential are arranged on a further insulating rod (36) likewise laterally of the tap selector (1), characterized thereby, that the movable polarity contacts (38) are actuable by means of a further actuating fork (48) borne at the upper cage ring (6), wherein a roller (33) likewise sitting on the drive sheave (13) of the selector engages into this further actuating fork (48).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a tap selector formed by combining rods into a cylindrical cage shape, and a polarity reversal device disposed on the side of the tap selector. It consists of an upper and lower arm connected to the annular frame of the selector, an insulating bar fixed to the annular frame and equipped with a polarity reversing contact, and a switching shaft supported by the arm. It is driven by an actuation link supported by an upper annular frame and supports a movable polarization contact, and a cam provided on the drive disk of the tap selector is engaged with the actuation link. Another insulating bar is arranged on the side of the tap selector, and this insulating bar is provided with a polarity contact for setting the intermediate tap of the bank coil to a predetermined voltage. The polarization contacts relate to an on-load tap changer operated in conjunction with polarization contacts.

A load tap changer of this type is known from DE 2815736 A1.

The technical object of the invention is to provide a load tap changer of this type which is improved with respect to the actuation of the polar contacts. This technical problem consists in actuating the movable polarization contact by means of a fork-shaped actuating body supported on the upper annular frame, which actuating body is equipped with rollers which are likewise provided on the drive disc of the tap selector. This is solved by engaging the .

The advantage of this invention is that the actuation of the polar contacts can be carried out directly by the drive disc of the tap selector;
This driving disk can also operate a polarity changer. The actuation of the polarity contacts is therefore carried out directly by the drive disc of the tap selector, rather than by actuation of the reversal contacts or actuation of the selector contacts, as is conventional. This not only makes it possible to operate the polar contact with a simple configuration, but also significantly improves the accuracy of the operation. This is because in the conventional configuration in which the operation start time is serially shifted, that is, in the configuration in which the operation of the polarity contact is started based on the operation process of the polarization contact, due to the inevitable tolerance, the parallel Accuracy is reduced compared to configurations that perform actuation.

In a particularly advantageous embodiment, the link and the actuating body for the actuation of the polarizer and the polarizing contacts are supported by the same shaft, and the said link is supported by a common roller on the drive disk of the tap selector. and may actuate the actuating body. The recesses provided in the link and the actuating body to engage this roller are such that, when the link and the actuator are at rest, the roller first enters the recess of the polarity changer and begins to advance. And it will be placed. Furthermore, if the link and the actuating body are supported by the same shaft, and this shaft is provided with a crank for advancing the drive disc of the tap selector, the overall construction is further simplified. . Also, the fixed polarity contacts need not be arranged over the entire height of the tap selector or the entire length of the insulating bar of the tap selector, but depending on their voltage, may only be placed, for example, in the upper third of the tap selector. It is also possible to provide one. Therefore, the movable polarity contact is formed in a rod-shaped body supported on one side, the free end of which is to be provided with a contact, swinging parallel to the insulating bar of the fixed-polarity contact. Can be configured.

An embodiment of the invention is illustrated in the accompanying drawings and will be described in more detail below.

The on-load tap changeover device includes an original tap selector 1 with an intermittent actuation device 2, and this tap selector 1.
The actuating device 2 is composed of a polarity changer 3 placed on the side and a polarity changer 4 similarly placed on the side, and the actuating device 2 is adapted to be interlocked with a power source changer (not shown). The tap selector 1 is formed by combining rods into a basket shape, and the lower rod-shaped frame 5 and the upper annular frame 6 are provided with insulating bars 7 arranged in parallel in a circumferential manner. Tap contact 8 is fixed. Two concentric insulating cylindrical bodies 9, 10 are arranged within the cage, and these cylindrical bodies 9, 10 are supported by frames 5, 6 so as to be rotatable step by step in the circumferential direction thereof. When the cylinders 9, 10 are rotated stepwise, the bridging body 11 moves from one tap contact 8 to an adjacent tap contact 8. Each cylinder 9, 10 is further provided with drive discs 12, 13, and this disc 1
2 and 13 are formed with grooves 14 corresponding to each step position. A crank 15 that is rotatable by 180 degrees is engaged in the groove 14 at rollers 16 and 17 for each step position. Crank 15 is
It is supported by a frame 18 fixed to the annular frame 6. An arm 19 is formed on a part of the frame 18, and a similar arm 20 is also provided on the annular frame 5. Two vertical insulating bars 21, 22 are attached to the arms 19, 20, and each insulating bar 21,
22 are provided with polarity reversing contacts 23 and 24, respectively. Furthermore, the arms 19, 20 support a switching shaft 25 of the polarity changer 3, and a polarization contact 26 is mounted on this switching shaft 25. The switching shaft 25 of the polarizer 3 is connected to an arm 27 at its upper end. The arm 27 is for actuating the switching shaft 25, and is formed with a groove 28 that engages with the roller 29 of the fork-like actuation link 30. The link 30 is connected to the annular frame 6 by the shaft 31.
installed on. A roller 33 provided on the disc 13 of the cylindrical body 10 is engaged with the fork-shaped recess 32 of the link 30 . Needless to say, the roller 33 is arranged on the disk 13 in such a way that the polarity changer 3 is activated only when the actual tap selector 1 makes a corresponding step.

The arms 19 and 20 have arm parts 34 and 35, respectively, and an insulating bar 36 is further fixed to the arm parts 34 and 35. A polar contact 37 is fixed to the insulating bar 36, and together with a movable polar contact 38, this contact 37 forms a contact pair. The movable polar contact 38 is supported by the arm 19 at a pivot 39, and the other part of the polar contact 38 is formed in the form of a bent rod. The free end 38' of the polar contact 38, which should be in contact with the contact 37, is connected to an insulating bar 36,
It extends parallel to 21 and 22. A crank 42 with two general stop-shaped recesses 40, 41 is rigidly connected to the movable polar contact 38. Recesses 40, 41 in crank 42
The cams 43 and 44 of the drive wheel 45 are engaged with each other alternately, and the drive wheel 45 is engaged with the end 46 of the switching shaft 25 of the polar reversal device.
is supported by. A gear 47 is provided on the lower surface of the drive wheel 45, and a fork-like operating body 48 is engaged with the gear 47. A sector gear 49 is formed at one end of the actuating body 48, and a fork-shaped recess 50 of the sector gear 49 is provided with a roller 3 provided on the disc 13.
3 is introduced. The actuating body 48 is supported by the same shaft 31 as the link 30 for actuating the polarity changer 3 .

The step, which is the basis for the operation of the polarity reversal device 3 in the tap selector 1, has the following function. That is, the crank 15 rotates the disk 13 by an angle α in the direction of the arrow in FIG. 2, thereby causing the tap selector 1 to advance. At this time, the roller 33 provided on the disc 13 is first moved to the upper side, that is, to the recess 50 in the actuating body 48 for actuating the polarity switch 4.
go inside. On the other hand, the swing of the actuating body 48 is caused by the gear 49
The signal is transmitted to the drive wheels 45 via. At this time, the gear 45 has already moved its cam 43 into the recess 4 of the crank 42.
0, the crank 42 is immediately swung, and the polarity contact 38 is also swung together with it and comes into contact with the fixed polarity contact 37 (FIG. 3). During this time, the recess 50 substantially overlaps the recess 32 in the lower link 30 for actuation of the polarity changer 3, so that the link 30 follows the actuating body 48. Roller 29 introduced into the groove 28 in the arm 27 of the polar changer 3
As a result, the shaft 25 of the polarizer 3 is actuated, whereby the movable polarizing contact 26 is transferred from the polarizing contact 23 to the polarizing contact 24 (FIG. 4). Then drive wheel 4
5 rotates idly, and at the same time, the cam 43 completely escapes from the recess 40 and swings. On the other hand, the cam 44 similarly oscillates, and the recess 4 in the crank 42 of the polar contact 38
Enter 1. Then the roller 33 of the disc 13
leaves the recess 32 in the link 30 for polar reversal actuation, leaving the link 30 stationary. On the other hand, the actuator 48 operates integrally, and in this operation stage, the operation transmitted to the drive wheels 45 is by the crank 4.
2, thereby opening the polarity switch 4. It goes without saying that the reversal is also possible by performing the same operating process in the reverse order.

[Brief explanation of drawings]

FIG. 1 is a side view showing the tap selector of the on-load tap switching device according to the present invention, and FIGS. 2 to 5 show the states of the driving means for the polarity changer and the polarity contacts at each stage of the operation process. FIG. 1...Tap selector, 2...Intermittent actuation device, 3
...Polarity switch, 4...Polarity switch, 5...Lower annular frame, 6...Upper annular frame, 7...Insulating bar, 8
...Tap contact, 9, 10...Insulating cylinder, 11...
...Bridge body, 12, 13... Drive disk, 14... Concave groove, 15... Crank, 18... Frame body, 19, 2
0... Arm, 21, 22... Insulating bar, 23,
24, 26...Polarization contact, 25...Switching shaft, 27
...Arm, 28...Groove, 29...Roller, 30
...Fork-shaped operating link, 31... Axis, 32...
...Fork-shaped recess, 33...Roller, 34, 35
...Arm part, 36...Insulation bar, 37, 38...
...Polar contact, 38'...Free end, 40, 41...
...Geneva stop-shaped recess, 42...Crank, 4
3, 44... cam, 45... drive wheel, 46... end, 47... gear, 48... fork-shaped operating body,
49...Sector gear, 50...Fork-shaped recess.

Claims (1)

[Scope of Claims] 1. A tap selector formed by combining rods in a cylindrical cage shape, and a polarity reversal device disposed on the side of the tap selector, the polarity reversal device having an annular shape of the tap selector. It consists of an upper and lower arm connected to the frame, an insulating bar fixed to the annular frame and equipped with a polarity reversing contact, and a switching shaft supported by the arm, and the switching shaft is connected to the upper annular frame. It is driven by an actuating link supported by the body and supports a movable polarizing contact, the actuating link being engaged by a cam provided on the drive disc of the tap selector to select the tap. Another insulating bar is placed on the side of the vessel.
This insulating bar is provided with a polarity contact for setting the intermediate tap of the bank coil to a predetermined voltage. The polarization contact 38 is actuated by a fork-shaped actuating body supported on the upper annular frame, in which a roller 33, which is likewise provided on the drive disc 13 of the tap selector, engages. An on-load tap switching device characterized by: 2. The actuating link 30 for actuating the polarity changer 3 and the actuating body 48 for actuating the movable polar contact 38 are supported by the same shaft 31, and the link 30 and the actuating body 48 are connected to the tap selector 1. driving disk 1
3. The load tap switching device according to claim 1, wherein the same rollers 33 in the taps 3 are engaged. 3. The recesses 32 and 50 of the link 30 and the actuating body 48 for engaging the rollers are such that when the link 30 and the actuating body 48 are in a stationary state, when the roller 33 attempts to make a step, the roller 33 is polarized. 3. An on-load tap changeover device according to claim 2, characterized in that they are arranged in such a mutual relationship that they are first introduced into a recess 50 in the actuating body 48 of the changeover device 4. 4 The link 30 and the actuating body 48 are connected to the same shaft 31
Claim 2 or 3, characterized in that a crank 31 for advancing the drive discs 12, 13 of the tap selector is also mounted on the shaft 31. The tap switching device under load as described. 5. The movable polar contact 38 consists of a bent metal rod supported at one end, the free end 38' for providing the contact being approximately parallel to the insulating bar 36 on which the fixed polar contact 37 is provided. Claims 1 to 3 are characterized in that they are capable of swinging in a state of
The on-load tap switching device according to any one of clauses 4 to 4.