BG112460A - Oil vessel with step regulator with voltage adjustment in star connection center - Google Patents

Abstract

The oil vessel includes a carrier head (1), an isolation cylinder (2) and a bottom (3). The carrier head (1) consists of a carrier flange (4), a housing (5), a lid (6) and a protective membrane (7). On the housing (5) is mounted a worm reduction gear (11) whose output shaft (12) is connected to a toothed gear (38), engaged with another toothed gear (39), which on one side is engaged with a toothed gear (40) with twice the number of teeth, and on the other hand triggers a Geneva drive (4b) connected to a digital disk (49). The toothed gear (40) has a rod (41) through which the spring energy accumulator (30) is charged. To the bottom (3) made of insulating material are attached six current-carrying rods (1b), which are connected to plug contact elements (35) arranged along the periphery of the contact system (28) of the diverter switch. It also has a flange (31) above which a spring-energy battery (30) is mounted. To the flange (31) by means of insulating straight bars (32) is hinged the contact system (28) with resistors (29).

Description

FIELD OF THE INVENTION

The invention relates to a three-phase oil vessel with a power switch, designed to regulate under load the voltage of power transformers with windings connected in a star center. Vacuum arc quenching chambers can also be used in order not to contaminate the oil in the oil pan.

BACKGROUND OF THE INVENTION

There is a wide variety of oil tanks with built-in power switches. The chosen ones on the steps

1/11 regulators are most often located under the oil vessels. The most compact are these step regulators, in which the wires from the three phases of the selected pass vertically upwards in the central tube of the selected and reach the bottom of the oil tank.

There are two options for connecting these wires is the power switch. One is for these wires to run horizontally under the bottom and then vertically to the through contacts of the oil tank cylinder. The other option is for the wires to pass directly through the bottom of the oil pan.

An oil vessel with a built-in power switch (1) is known, comprising a support head, an insulating cylinder and a metal bottom. The power switch contains a spring-loaded energy accumulator, a contact system and resistors arranged one below the other. The conductors of the selected one passing laterally around the insulating cylinder are connected to the power switch by means of radial through contact elements and plug contact units. The power switch is suspended to the support head by an insulating cylinder or rails. A vertical drive shaft passes in the center of the power switch. It is connected at the top with a worm gearbox mounted on the cover of the support head, and at the bottom it passes through the center of the bottom. Mechanisms for final mechanical locks and for displaying the positions are installed above the bottom. Below the bottom, the drive shaft is connected to mechanisms for actuating a dial.

The disadvantage of this oil tank with a power switch is that the mechanisms above the bottom of the oil tank when the power switch is installed are inaccessible for monitoring, and when the switch is removed it is difficult to check and repair them. Another disadvantage is that after removing the cover and the worm gearbox, no control changes can be made by the motor drive.

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Another disadvantage is that the misalignment of the wires is complicated.

An oil vessel with a power switch (2) is also known, in which the wires of the selected pass directly through a metal bottom through through insulators. Coupling is done by plug contact nodes located at the resistors. The design of the power switch is analogous to that of (1).

The disadvantage of this oil tank with a power switch is that the mechanisms for the final mechanical locks and the position display cannot be mounted above the bottom. Deploying them elsewhere is very difficult.

Another oil vessel with a power switch (3) is also known, in which the wires of the selected also pass through the bottom of the oil vessel. At the periphery of the bottom are arranged vertical conductive columns, to which are fixed, by means of special bolts, radial cantilever ends of the fixed contact elements of the contact system of the power switch. The main units of the power switch are arranged one below the other in sequence - resistors, contact system and spring energy accumulator. Above the bottom of the oil tank there are mechanisms for charging the spring-energy accumulator. The drive shaft of the dialer is located on the side of the insulating cylinder. The bottom of the oil pan can be metal with through insulators or be made entirely of insulating material.

According to this design concept, another oil tank with a power switch (4) is made. The disadvantage here is that the mechanisms for driving the spring-energy battery are hidden when the power switch is installed and are difficult to revise and repair - when removed. The pass-through insulators and drive mechanisms located at the bottom leave little space for the spring-energy accumulator. He must be

3/11 with special construction. High accuracy is also required in the manufacture and installation of bushings with conductive columns and the contact elements of the power switch in order to obtain trouble-free coupling.

SUMMARY OF THE INVENTION

The object of the invention is to provide an oil vessel is a power switch for a step voltage regulator, in which all drive gears, the mechanisms for final mechanical interlocks and the spring-energy accumulator are available for monitoring and revision when the support head cover is removed. To be able to make easy installation in bell type transformers without disassembling the mechanisms. The bottom of the oil pan should be simple, without mechanisms on it and should have a small height.

The problem is solved, according to the invention, with an oil vessel with a built-in three-phase power switch, comprising a support head, an insulating cylinder and a bottom, a built-in power switch consisting of a contact system, resistors and a spring-energy accumulator. The wires from the central tube of the selected pass through the bottom. There are also mechanisms and gears for charging the spring-energy battery, for the final mechanical locks and for displaying the positions.

According to the invention, the support head comprises a support flange with a housing mounted on top of it. The mechanisms and gears are located inside the support head in a convenient place for monitoring and control. The power switch is attached to a flange, on top of which is mounted a spring-energy battery, and below it on insulating rails hangs the contact system is resistors. The bottom is made of insulating material, and cylindrical ends of current-carrying rods are attached and sealed to it. The wires are attached to the cylindrical ends

4/11 coming from the central tube of the elect. At its upper end, the current-carrying rods are connected to plug contact elements arranged on the periphery of the contact system. The rods are fixed and reinforced with an insulating ring.

The flange of the power switch is fastened with screw connections to the inner hole of the bearing flange. The contact system is fixed at its lower end to the bottom by pins.

A shaft connected to a worm gear has a gear engaged with another gear with the same number of teeth. Its shaft is mounted in a cup attached to the bearing flange. This shaft has a locking tooth and a gear connected to a Maltese gear. It is mounted on a shaft has two locking pins. A digital disk is mounted above the Maltese gear.

The gear wheel of the drive shaft is engaged with another gear with twice the number of teeth. Its shaft is mounted on the flange of the power switch. A rod is attached to this gear, which charges the spring-energy accumulator.

The described support head can also be used for oil vessels containing power switches and isolated phases.

An advantage of the oil tank with power switch is that all gears and mechanisms are located in the support head and their action can be observed when the cover is removed, including when operating the motor drive. Another advantage is that the bottom of the oil pan is simplified and the insulation distances are significantly reduced. The installation of the power switch is easy. Another advantage is that the construction is simplified and can be installed to bell-type transformers.

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EXPLANATION OF THE ATTACHED FIGURES

An exemplary embodiment of the oil tank with a built-in three-phase power switch according to the invention is shown in the attached figures, of which:

Figure 1 is a longitudinal section through the oil pan, the power switch not cut and given schematically as it may be of a different type.

Figure 2 - Cross section (A - A) above the bottom of the oil pan with the power switch removed.

Figure 3 - Top view of the mechanisms with the cover partially removed and the housing partially cut (B - B).

Figure 4 - Top view (B - B) and cross section (C - C) of the gears, mechanical locks and the dial at an enlarged scale.

EXAMPLES OF EMBODIMENT OF THE INVENTION

The oil pan consists of a support head 1, an insulating cylinder 2 and a bottom 3. The support head 1 comprises a support flange 4, a housing 5, a lid 6 and a protective membrane 7. The support flange 4 is connected to the upper part of the insulation cylinder 2 and is sealed to him. The connection between the support flange 4 and the housing 5 is made by screw connections 8, which are used in a known manner in bell-type transformers. In the housing 5 there are two radial holes 9 to which are connected pipe outlets with flanges 10. On the housing 5 is mounted a worm gear 11, whose output shaft 12 is coupled to a shaft 13, mounted to the housing 5 and sealed to it by seals 14. The worm box can be rotated at a desired angle.

The bottom 3 is made of insulating material. On it are mounted and sealed cylindrical tips 15 on six elongated current-carrying rods 16, two for each phase X, Y, Z. They are fixed and reinforced with

6/11 insulating ring 17. The bottom 3 is supported at the bottom by a metal ring 18 having a crown 19 for connection to an undisclosed known selected and a bracket 20 for mounting a known pair of gears 21. The second gear has a coupling 22 which is coupled with a known freewheel clutch for actuating a dial. Six conductors 24 protrude from the central tube 23, which are bent under the bottom 3 and connected to the cylindrical ends 15 of the rods 16. There is also a short current-carrying rod 25, which serves as a terminal of the star center. The shaft 13 is connected to the gear 21 by a known insulating shaft 26. There is also a siphon tube 27 connected to one of the pipe terminals 10. In case it is not necessary for the flanges of the pipe terminals 10 to be able to rotate at a certain angle, the corresponding transformer pipes can be connected directly to the openings 9. This will simplify the construction.

The built-in power switch consists of a contact system 28, resistors 29 and a spring-energy accumulator 30. The structure is supported by a flange 31, to which the spring-energy accumulator 30 is mounted on top, and the contact system 28 is attached to the bottom with three insulating rails 32. The output shaft 33 of the spring energy accumulator 30 is connected to an insulating shaft 34 actuating the contact system 28. On the periphery of the contact system 28 there are six plug contact elements 35, which are connected to the rods 16 when the power switch is inserted in the oil tank. the contact system 28 has three pins 36, which center and fasten it to the bottom 3. The flange 31, when the power switch is inserted, is attached to the bearing flange 4 by means of screw connections. The power switch is removed and started by means of hooks 37. The power switch is presented only as a composition, as the contact system 28 and the spring-energy accumulator 30 can have different variants.

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The gears which actuate the spring-energy accumulator 30 and the mechanisms for the final mechanical locks and indication of the positions are located in the bearing head 1 (Fig. 3, Fig. 4). The shaft 13 has a gear 38, which is engaged with a gear 39 with the same number of teeth. The latter is engaged with a gear wheel 40, which has twice the number of teeth. An eccentrically mounted rod 41 on this gear charges the spring-energy accumulator 30. The shaft 42 of the gear 39 is mounted in a cup 43 attached to the bearing flange 4. It has a locking tooth 44 and a gear 45 for a Maltese gear 46 mounted on a shaft 47 The shaft 47 has two locking pins 48 which, when the end positions are exceeded, block the rotation of the shaft 42 by the locking tooth 44. A digital disk 49 is mounted on the Maltese gear 46, which indicates the position of the step regulator. A gear 50 is also provided, which indicates a "normal position". The readings of the step number are visible through the undisplayed window located on the upper wall of the housing 5. On its periphery there are openings 51, through which the installation on the transformer cover takes place. Lifting of the entire step regulator is performed by a crane by means of hooks 52.

The operation of the gears and mechanisms when switching the oil tank with a power switch is as follows:

The worm gear 11 is actuated by a motor drive in a known manner. Shaft 14, resp. the insulating shaft 26 make one switching turn. The gear 21 reduces the rotation to half a turn of the shift of the nozzle 22, which participates in a known freewheel clutch. This is how the voter is activated. The gear 38 of the shaft 13 also makes one gear shift and in turn rotates the gear 39 at one gear rotation. This speed is reduced by half a gear shift speed 40. During this rotation, the rod 41 tightens the springs of the spring-energy accumulator 30. After

8/11 angle of rotation, for example about 145 °, the spring-energy accumulator 30 is released and switches the contact system 28 abruptly. At the next switching, the contact system 28 rotates in the opposite direction. The translation 45 rotates the Maltese gear 46 an angular step and the next step is displayed. When the end position is passed, the respective pin 48 blocks tooth 44.

Claims (6)

PATENT CLAIMS 1. An oil vessel with a power switch for a step regulator is a voltage regulation in a star center containing a bearing head, an insulating cylinder and a bottom, with a built-in power switch consisting of a contact system, resistors and a spring-energy accumulator. , and there are also mechanisms and gears for charging the spring-energy accumulator, for ultimate mechanical locks and for displaying the positions, characterized in that the support head (1) comprises a support flange (4) with a housing mounted on top of it (5). ), the mechanisms and gears being inside the support head (1) in a place accessible for monitoring and control; the power switch is attached to a flange (31), on top of which is mounted a spring-loaded battery (30), and below it on insulating rails (32) hangs a contact system (28) is resistors (29), the bottom (3) is made of insulating material and to it are attached and sealed cylindrical ends (15) of current-carrying rods (16), to which under the bottom are caught wires (24) coming from the central tube (23) of the selected, and at its upper end the rods (16) are connected with plug contact elements (35) arranged on the periphery of the contact system (28). Oil container with power switch according to claim 1, characterized in that the rods (16) are fixed and reinforced by an insulating ring (17). Oil container with power switch according to claims 1 and 2, characterized in that the flange (31) of the power switch is fastened with screw connections to the inner hole of the power switch. 10/11 the support flange (4) and the contact system (28) is fixed at its lower end to the bottom by pins (36). Oil pan with power switch according to claims 1, 2 and 3, characterized in that on a shaft (13) connected to a worm gear (11) there is a gear (38), another gear (39) with the same a number of teeth whose shaft (42) is mounted in a cup (43) caught on the support flange (4) and has a locking tooth (44) and a gear (45) connected to a Maltese gear (46) which is mounted on a shaft (47) ) is two locking pins (48), and a digital disk (49) is mounted above the gear (46). Oil pan with power switch according to claims 1, 2, 3 and 4, characterized in that the gear (39) is engaged with another gear (40) with twice the number of teeth, which is mounted to the flange (31) and has a rod (41) for charging the spring energy accumulator (30). Oil container with power switch according to claims 4 and 5, characterized in that the support head (1) with all gears and mechanisms in it can also be used for a power switch with isolated phases.