KR20190119057A - Spring energy accumulator for power diverter switch of on-load tap-changer - Google Patents

Abstract

The spring-energy accumulator is mounted on the carrying flange 1. It comprises a left lever 7 and a right lever 9 mounted on two pivots 2, 3 fixed in the carrying flange 1. A switching spring 12 is mounted between both ends 10, 11 of the two levers 7, 9. If desired, additional springs 13 may be used to provide step force characteristics. The lever includes an extended front portion 14, 15 inside it, and one of the upper rolling-contact bearing 16, double-arm switching lever 19, which is connected to the distal end of the filling lever 18. It is positioned between the lower rolling-contact bearing 17, which is connected to the arm. The other arm has a stem 21 about shifting to the locking pawls 22, 23. They are mounted to the lower part of the third pivot 4, and the upper part is mounted to the filling lever 18.

Description

Spring energy accumulator for power diverter switch of on-load tap-changer

A spring-energy accumulator is used to implement a switch of a contact system of a power diverter switch for an on-load tap changer. The on-load tap changers are embedded in power transformers and used to regulate their high voltage under load (ie, without interruption of power supply to the consumer).

There is a wide variety of spring-energy accumulators for power diverter switches of on-load tap-changers. They are used in power oil diverter switches that are arced in transformer oil and vacuum-arc cameras.

The spring energy storage device 1 is known to comprise two tensioning springs operating in tension mode. The nozzle of one of these springs is connected to the end of a lever mounted on a bush located along the axis of the power diverter switch. The other end is connected by a slider having one end of the switching lever, and the other end is fixed at both end positions by a locking mechanism. An axle at the end of the rotatable central lever, attached to one end of the spring, includes a stem connected to the lever. This lever is rotated by a hinged four-stroke mechanism mounted to the bottom of the oil container. The tension of the spring is performed in this way.

The disadvantage of this spring-energy accumulator is that it takes up a lot of space as the mechanism rotates within the entire circle. Another drawback is that the charging mechanism is in an inconvenient position and the access for surveillance and revision is difficult.

In the case of some power diverter switches with vacuum interrupters, it is necessary to start switching with a larger motor torque for a relatively short time interval. This means that the force characteristic of the spring must be stepped. (2) shows a spring block applied to (1). In this structure, inside each of the two springs there is one short spring connected to the rod and have an idle movement at the start of switching.

The disadvantages of (1) are kept here, and other disadvantages appear. Since the position inside the spring is limited, it is not allowed to implement a greater additional force.

It is also known as another spring-energy accumulator 3 which takes up less space since the movement of the spring is linear. It includes a carrying housing, attached to the ends of two parallel axes. Two sleds are mounted which slide along the edges of the two switching springs, operating in the pressure mode. The spring is loaded from a shaft with eccentric contact with a straight rail on the upper sled. The output shaft (connected with the contact system of the power diverter switch) is mounted coaxially on the filling shaft. The output shaft includes an arm with a pin and a roller located in the transversal groove of the lower sled, through which jump switching occurs. The arm also includes two teeth, which are fixed in an end position by a locking mechanism.

A disadvantage of spring-energy accumulators is that the friction between sleds and axles increases due to eccentric filling and release. Since they are mounted coaxially around the axis, the sprain of the compression spring contributes to increased friction. This is particularly disadvantageous for power diverter switches operating in a gaseous environment. Another disadvantage is the complicated connection between the output shaft and the contact system. Design and assembly require high precision.

Thus, there is another structure of the spring-energy accumulator 4, in which two guiding axes and coaxially mounted springs operating in pressure mode are coaxially mounted with two guiding axes. These are arranged side by side one below the other axis. The filling is also made by the shaft with eccentricity. Movement from the sled to the output shaft is transmitted through a toothed rack, which is attached to the sled and the gear wheel. There are also components for releasing the locking mechanism and the components attached to the sled.

A disadvantage of the spring-energy accumulator is that the structure, in particular the locking mechanism and the associated components, are complex. Another disadvantage is that the toothed gear loads the sled eccentrically and the friction is greater because the spring operates under pressure. This is also disadvantageous for power diverter switches operating in a gaseous environment.

There is further a spring energy storage device 5 which is more advantageous for charging and loading release. It comprises a transport housing to which two parallel transport axes are mounted. Two sleds slide on both mirror-mounted surfaces. Two springs operating in tension mode are mounted coaxially with the axles and attached to an outer edge of the axle. There are two rolling bearings located below the other between the internal faces of the sled. One of them is mounted on the end of a lever connected to an eccentric located on the filling rod and the carrier housing. The other roller bearing is mounted on one side of the shift lever connected to the drive shaft of the contact system. The other arm is locked at the end position by the locking mechanism.

A disadvantage of this spring-energy accumulator is that high accuracy is required for the making and assembly of components in order to limit sliding friction. Another disadvantage is that the rolling bearings are loaded locally for filling and switching (not beneficial to them).

In the structure shown in (5), step power characteristics can be achieved. This is done according to (6). On both sides of the housing, it is mounted in parallel between the axles by one spring with a piston, operating in the pressure mode, and tightened at the end of the filling.

The disadvantage is that the structure is complicated and the friction increases, regardless of the use of the step power characteristic. Another disadvantage is that additional springs work with some useless movement, so that their initial force is not used, but it is the largest.

It is an object of the present invention to provide a spring-energy accumulator for a power diverter switch of an on-load tap changer with a simple design without sliding pairs of contact components. The connection between the components must only be carried out by rolling bearings. Spring blocks should be independent and accessible to the installation so that the spring can be easily replaced with others. The filling mechanism should be simple and the shifting of the roller bearings should not be loaded in only one place.

The task is solved by a spring-energy accumulator for the power diverter switch of the on-load tap changer (including the conveying flange mounted to the filling system and the switching system). The switching system is equipped with a switching spring in the end positions and a locking mechanism to unlock and start switching.

According to the invention, three pivots are mounted on the carrying flange. The left pivot is mounted to the left lever and the right pivot (hub of the right lever). The filling lever is mounted on the third pivot. The two levers are located between the upper rolling-contact bearings, connected to the end of the filling lever and the lower rolling-contact bearings, and one end of the double-arm switching lever. It includes an extended front section, connected to it. The end of this lever has a stem, which is fixed at the extreme end position by two locking pawls. Between the ends of the two levers are mounted switching springs operating in tension mode. The charging system includes a gear wheel that performs a half switching cycle and a rod connected between the gear wheel and the charging lever.

Three pivots are mounted to the lower part of the carrying flange, and the upper part is reinforced with a common triangular plate. The locking system includes a left locking pawl and a right locking pawl connected to the spring. They are mounted on the lower part pivot, the upper part of which is mounted to the filling lever. The shaft of the filling gear wheel is mounted in the bush, which is fixed on the carrying flange. The shaft of the double-arm lever is mounted in the middle of the conveying flange and is coupled to the shaft driving the contact system. Semi-cardan connectors can be used for coaxial missing. To obtain greater force at the start of switching, additional springs can be used between the two lever ends. The spring includes a piston with a spindle, which can perform an idle stroke until it stretches the spring.

An advantage of the sping-energy accumulator according to the invention is that its structure is very simple and convenient to monitor and control. There is no sliding pair component in it. All joints are hinged on the basis of the rolling bearing. Another advantage is that the springs are open, accessible and easily change depending on the type of power diverter switch they switch on. In addition, the step power characteristic according to the independent spring can be easily achieved as needed. Another advantage is that the charging system is very simple and reliable.

An embodiment of a spring-energy accumulator, according to the invention, is shown in the accompanying drawings.
1 is a longitudinal sectional view through a center of a spring-energy accumulator.
2 is a top view of a spring-energy accumulator presented in a central position to further understand the structure.
3 is a cross-sectional view of a double-armed switching lever and blocking fingers.
4 is a vertical cross-sectional view perpendicular to FIG. 1.
5 is a longitudinal sectional view through the bearing of the switching lever and through the filling lever.
6 is a cross sectional view through the switching spring;
FIG. 7 is a section through additional springs providing a step force characterized by a large initial force.

The spring-energy accumulator is mounted on the carrying flange 1. Three axes 2, 3 and 4 are attached to it, and they are secured to the top by the plate 5. The shaft 2 is mounted to the hub 6 of the left lever 7, and the shaft 3 is mounted to the hub 8 of the right lever 9. To more easily depict sections and views, spring-energy accumulators are provided in a middle, intermediate position.

The switching spring 12 is mounted between the ends 10 and 11 of the two levers 7 and 9. If a larger initial force is required, additional springs 13 with special force characteristics can also be mounted. On its inner side, the lever 7 comprises an extended front portion 14, and the lever 9 comprises a front portion 15. Between these front parts is an upper rolling-contact bearing 16 and a lower rolling-contact bearing 17. The bearing 16 is mounted at the distal end of the filling lever 18 and the shaft 4 (FIGS. 4 and 5). The bearing 17 is mounted to one arm of a double-arm switching lever 19 with a shaft 20 (mounted at the center of the carrying flange 1). The lever 19 comprises a stem 21 which is locked in a shift in extreme positions by a left locking pawl 22 and a right locking pawl 23 on its other arm. These pawls are mounted on the bottom of the shaft 4. Tensioned springs 24 extend between their outer edges. To start the switching process, unlocking of the stem 21 is performed by the pawl 25, which is fixed to the filling lever 18.

The driving of the filling lever 18 is released by a rod 26, the rod 26 on its one end and the other end of the gear wheel on the lever 18. 27). The shaft 28 of this gear wheel is mounted in the bush 29, which is mounted on the carrying flange 1. The gear wheel 27 is rotated by the external gear wheel 30, as conceptually shown. It makes one switching turnover and the gear wheel 27 produces half of the switching turnover.

The conveying flange 1 is most often mounted on the non-shown flange of the conveying head of the oil container of the on-rod tap changer. This is caused by bolts passing through the hole 31. The shaft 20 is connected with a shaft 32 that actuates a known contact system, which is not visible. In most cases, because the contact system is at the star center potential, the shaft 32 includes an insulating portion. It can be fastened to the carrying flange 1 by invisible, insulated leads. The power diverter switch is lifted by hooks 33. In order to compensate for some deviations of the coaxial placement, a semi-carded clutch 34 can be used for the connection between the shaft 20 and the shaft 32. have.

The switching spring 12 (FIG. 6) comprises nozzles 35 with holes connected with screws 36 with hubs 37. These are joined to the ends 10 and 11 of the levers 7 and 9 by pins 38. By means of screw connection, it can adjust the tension of the springs 12 within certain limits. The lock is created with a counter nut 39.

An additional spring 13 (FIG. 7) is connected to the distal end 10 by a nozzle 40 with a stem 41. The other side of the nozzle 42 is free. The axle 23 slides in its opening, one end with a piston 44, the other end with a stem 45, and is attached to the nozzle 11. The free stroke x determines the stretch point at which additional systems will appear.

The action of the spring energy accumulator is:

In the starting position, the switching lever 19 rotates (eg 45 ° clockwise, FIGS. 2 and 3) and the stem 21 is locked by the right locking pawl 23. The levers 7 and 9 rotate to the left, and the filling lever 18 also rotates. The gear wheel 27 is at the left dead point, and the rod 26 is fixed along the diameter.

When a switch command is submitted, the gear wheel 30 is rotated by an invisible gear. It rotates the gear wheel 27 (for example clockwise). The rod 26 moves to the right of the filling lever 18 and the bearing 16, acts on the extended front 15 of the lever 9, and moves it to the right. At the same time the bearing 17 holds the lever 7 in the starting position and the spring 12 begins to tighten. At a certain angle before the gear wheel 27 reaches its right dead point, the corresponding pawl 25 from the charging lever 18 causes the right locking pawl 23 and the left lever ( Release 7), jog to the right, act on the double-arm lever 19 via bearing 17, and perform switching of the contact system. The stem 21 of the switching lever 19 is locked by the left locking pawl 22. The spring-energy accumulator waits for the next switching. This creates a similar method by rotating the gear wheel 27 clockwise or vice versa. It rotates 180º from the right dead point to the left dead point.

references:

1.BG 34013-H01F 29/04

2.BG 66472 B1-H01H 9/00

3.DE 2806282-H01F29 / 04

4.BG 64762 B1 (DE 10050932)-H01H 89/00

5.BG 64808 B1-H01F 29/00

6.BG 66467 B1-H01F 29/04

Claims (6)

In a spring energy accumulator for a power diverter switch of an on-load tap changer,
A carrying flange 1 (to which the charging system and the switching system are mounted), the charging system being equipped with a switching spring 12, a locking mechanism and an unlocking means; ,
Among them, a pivot is mounted on the carrying flange 1, a filling lever 18 is mounted on the pivot, and an upper rolling-contact bearing 16 is mounted on the filling lever ( 18, the lower rolling-contact bearing 17 is connected to one end of the switching lever 20,
The other end of the switching lever 20 includes a potion which is fixed at two extreme positions by two locking pawls 22 and 23, the switching spring 12 Mounted between two levers, and
The filling system comprises a gear wheel 27 and a rod 26 connected to the gear wheel and the filling lever 18, wherein three pivots 2, 3, 4 are mounted on the carrying flange 1 and ,
The two levers 7, 9 are mounted in two pivots,
The hub 6 of the first lever 7 is mounted on the first pivot 2, the hub 8 of the second lever 9 is mounted on the second pivot 3, and the two Levers 7 and 9 include widened front portions 14 and 15,
The rolling-contact bearing 16 of the filling lever 18 is located between the extended front portions 14, 15, and the switching spring 12 is at the ends 10, 11 of the two levers 7, 9. It is mounted between),
Spring energy accumulator. The method of claim 1,
In its upper part, the three pivots 2, 3, 4 are reinforced with a triangular plate 5,
Spring energy accumulator. The method according to claim 1 or 2,
The locking system is connected to the spring 24 and is supported in the lower part of the pivot 4 and under the bearing of the filling lever 18, the left locking pawl 22 and the right side. Characterized in that it comprises a locking pawl 23 and the pawl 25 mounted on the charging lever 18 is used for unlocking at the start of silver switching,
Spring energy accumulator. The method according to any one of claims 1 to 3,
The shaft 28 of the gear wheel 27 is characterized in that it is mounted in a bush 29 mounted on the carrying flange 1,
Spring energy accumulator. The method according to any one of claims 1 to 4,
For the purpose of obtaining greater force at the start of switching, an additional spring 13 connected between the two ends 10, 11 of the two levers 7, 9 may also be used, which is also an axel A piston (44) having a (43), characterized in that the piston (46) is capable of performing an idle stroke (x) until the spring (13) begins to stretch. doing,
Spring energy accumulator. The method according to any one of claims 1 to 5,
Characterized in that the shaft 20 of the double-armed lever 19 is connected with the shaft 32 coupled with the contact system,
Spring energy accumulator.

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