JPH047084B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a switching switch of an on-load tap switching device used in an on-load tap-changing transformer, an on-load voltage regulator, or the like.

As shown in Fig. 1, the resistance type rotary type switching switch conventionally used in load tap switching devices has an insulating cylinder 1 with fixed contacts A ₁ to A ₄ for each phase arranged on the inner circumferential surface. A drive shaft 2 is provided at the center of the drive shaft 2, and this drive shaft 2 has three fan-shaped movable plates C ₁ , C on which movable contacts B ₁ to B ₄ are arranged in correspondence with the fixed contacts A ₁ to A ₄ . ₂ , C ₃ are installed via the connecting plate 3,
By rapidly rotating the drive shaft 2, the fan-shaped movable plates C ₁ , C ₂ , C ₃ are rotated, for example, clockwise in the figure, and the movable contacts B ₁ to B ₄ are connected to the fixed contacts A ₁ to B 4 . _A4
The tap _T 1 of the tap winding 4 is contacted by the tap selectors S ₁ and S ₂ through the current limiting resistors R ₁ and R ₂ .
It is configured to perform tap selection from T7 to _T7 . As shown in FIG. 2 above, the movable contacts B ₁ to B ₄ are slidable via pressure springs 5 radially arranged in the spaces within the fan-shaped movable plates C ₁ to C ₃ . It is energized outward and is a fixed contact when it is turned on.
It is provided so that sufficient contact pressure is maintained with A ₁ to A ₄ , and three sector-shaped movable plates C ₁ to C ₃
As shown in FIG. 2, the drive shaft 2, which is drivably connected to the connecting plate 3 and mounted on the connecting plate 3, is arranged vertically in the insulating cylinder 1 while being connected to the quick cutting drive mechanism 6. It is rotatably supported by upper and lower metal fittings 7a and 7b, and these upper and lower supporting metal fittings 7
a and 7b are fixed to each other by a connecting shaft 8 and are unrotatably supported by a mounting seat 9 provided within the insulating cylinder 1. However, as is clear from FIGS. 1 and 2, in the conventional switching switch A described above, the fixed contacts A ₁ to A ₄ are attached to the inner circumferential surface of the insulating tube 1, and the movable contacts Children B ₁ to B ₄ are fan-shaped movable plates that are drivingly connected to the drive shaft 2 via the connection plate 3.
Since the movable contacts B _{1 to B 4 are attached to C 1} to C ₃ , when inspecting the inside of the switching switch A, the movable contacts B ₁ to B ₄ can be easily inspected by pulling up the drive shaft 2 from inside the insulating cylinder 1. , it can be repaired, but on the other hand,
For the fixed contacts _A1 to _A4 , it was necessary to inspect the insulating cylinder 1 itself by pulling it out from inside the case of the transformer (not shown). For this reason, normally the entire insulating tube 1 is pulled up from inside the case, and then the movable part of the switching switch A is pulled out again from inside the insulating tube 1 to perform inspection work, which is a very time-consuming process. It was labor-intensive and troublesome. In particular, since the fixed contacts A ₁ to A ₄ are directly attached to the insulating tube 1 itself, it has been extremely difficult to inspect them. In addition, the switching switch A itself is housed and held in an insulating tube 10 provided separately from the insulating tube 1 of the switching switch A within the case of the transformer.
Since the insulating oil in the transformer and the insulating oil in the case do not interact with each other, a large storage space is inevitably required for the switching switch, and as a result, the transformer case becomes large and extremely uneconomical. It was hot.

The present invention eliminates the above-mentioned drawbacks, and when inspecting and repairing a switching switch of an on-load tap switching device,
The fixed contact part and the movable contact part are simultaneously pulled out from inside the insulating cylinder of the switching switch so that work such as inspection of each contact can be done quickly and easily. It has a dense structure, and the on-load tap switching device can be stored in the transformer case without using a dedicated insulating tube.
The purpose is to provide a switching switch for a tap switching device on load, which allows the transformer case to be downsized and manufactured economically.
To explain with a diagram, reference numeral 11 denotes a load tap changer which is housed hanging inside a transformer case 12 in which insulating oil is sealed.
A switching switch 14 and a tap selector 16 vertically installed below the switching switch 14 via a connecting member 15.
and an electric operating mechanism 17 provided on the outside of the case 12.
It is composed of: Reference numeral 18 denotes an insulating tube that houses the switching switch 14 and is vertically disposed inside the case 12. The insulating tube 18 has a flange provided on the outside of its upper open end, which is connected to an opening in the cover 41 of the transformer. By fixing to the cover 41 with bolts via the mounting seat 13 at the end, the cover 41 is suspended and held in the case 12 while being fixed to the cover 41, as shown in FIG. Reference numeral 19 denotes a rotation shaft inserted into the insulating cylinder 18 through the center of the bottom plate 20 which is attached to the lower open end of the insulating cylinder 18 and closes the lower end of the insulating cylinder 18 in an oil-tight manner; 21 is an epoxy resin or the like; This molded case 21 is made of synthetic resin and is formed into a cylindrical shape with an open top and a bottom. This molded case 21 is inserted into the insulating cylinder 18 with fixed contacts A ₁ to A ₄ fixed to its outer periphery. , as shown in FIG.
Mounting piece 23 formed integrally with fixed contact A ₁ on 2
By tightening and fixing with bolts, it is attached to the molded case 21 so as to be concentric within the insulating tube 18 and cannot be rotated. Reference numeral 24 denotes a drive shaft rotatably attached to the mold case 21 via a bearing 25 at the bottom of the mold case 21 at a position concentric with the rotation shaft 19.A drive hinge 26 is attached to the drive shaft 24 with a bearing. They are rotatably fitted through the connector. The fan-shaped movable plates C ₁ to C ₃ are rotatably attached to the body of the drive hinge 26 by means of a pivot 27, and each of the fan-shaped movable plates C ₁
Movable contacts B 1 to B 4 are arranged on the outer periphery of C ₃ to face fixed contacts A ₁ to A ₄ , and the movable contacts B _{1 to B 4 are} fan-shaped movable plates C ₁ to C 3 . It is attached via a pin 31 to a U-shaped holding fitting 30 that is integrally attached to the tip of a sliding shaft 29 that radially passes through a support wall 28 provided concentrically on _C3 .
The protruding ends of the pins 31 protruding from both ends of the holding fitting 30 are fitted into long grooves 32 arranged radially on the outer periphery of the sector-shaped movable plate _C1 , and the movable contacts _B1 to _B4 are moved back and forth. It is movably supported.
Further, a pressing spring 29a is interposed between the support wall 28 and the holding fitting 30, and urges the movable contacts _B1 to _B4 in the radial direction. 33 is the drive hinge 26
One of the storage springs is pivotally supported at the top of the drive hinge 26, and the other is a storage spring that is pivotally supported at the tip of an arm 35 that is non-rotatably attached to the upper end of the drive shaft 24 via a key 34. The energy storage spring 33 is extended by the rotation of the drive shaft 24 and the simultaneous rotation of the arm 35. When the energy storage spring 33 exceeds its dead center, the fan-shaped movable plates C ₁ to C ₃ are connected to the drive hinge. 26, the movable contacts _B1 to _B4 are rapidly rotated by the stored force of the stored force spring 35. That is, the drive hinge 26 and the arm 35
The drive hinge 26 and the energy storage spring 33 stretched between the arms 35 constitute a quick-cutting drive mechanism, which rapidly switches the sector-shaped movable plates _C1 to _C3 . 36 and 37 are connecting plates fixed to the lower end of the drive shaft 24 and the upper end of the rotating shaft 19, respectively, and one of the connecting plates 36 and 37 has an engaging pin 36.
a and 37a project in the opposite direction, and the other side has through holes 36b and 37b through which the engaging pins 36a and 37a are inserted. Engagement pins 36a, 37a provided on each connecting plate 36, 37
Each through hole 36b of each connected plate 36, 37,
37b, the drive shaft 24 is detachably coupled to the rotation shaft 19 and rotated. In addition, the switching switch 14 and the tap selector 1
6 is activated by the electric operation mechanism 17, respectively.
Rotating shaft 38 - Reduction drive mechanism 39 - Reduction gear 40
The switching operation is performed in a state where the rotation is decelerated through the a and 40b.

In the figure, R ₁ and R ₂ are current limiting resistors inserted between the molded case 21 and the bottom plate 20 of the insulating tube 18;
2 is a cover of the on-load tap switching device 11.

Next, to explain the case of inspecting or repairing the on-load tap switching device 11, first, when inspecting, etc., remove the cover 42, and then pour insulating oil into the insulating cylinder 18 of the switching switch 14. Remove with a pump, etc. After this, the fixed contact
After removing the bolts fastened to the mounting pieces 23 of A ₁ , attach the hanging parts 43 provided on some of the fixing bolts fixing the fixed contacts A ₁ to A ₄ to the mold case 21 as shown in the figure. The mold case 21 is hung above the case 12 by hanging a rope for lifting the mold case 21 as shown in FIG. At this time, since the arm 35 is fixed to the upper end of the drive shaft 24, the drive hinge 26 does not come off the drive shaft 24.
As a result, only the main body portion of the switching switch 14 separated from the insulating cylinder 18 can be taken out. In this state, the degree of wear and damage of the fixed contacts A ₁ to A ₄ and the movable contacts B ₁ to B ₄ is inspected. On this occasion,
That is, when inspecting in detail the inside of the movable parts of the switching switch 14 such as the movable contacts B ₁ to B ₄ or the spring pressure of the pressure spring 29 a, remove the energy storage spring 33 and then check the drive shaft 24 . When the stop plate 44 fixed to the upper end is removed, the key 34 is extracted, and the arm 35 is removed from the upper end of the drive shaft 24, the drive hinge 26 can be removed from the drive shaft 24. As a result, the switching switch The movable part 14 can be taken out from the mold case 21 and its interior can be inspected easily and in detail.

When storing the switching switch 14 in the insulating tube 18 again after inspecting the switching switch 14, etc.,
It can be easily stored by performing the opposite operation to the one used when taking it out. After storage, the mounting piece 23 is fastened and fixed to the mounting seat 22 inside the insulating cylinder 18 with a bolt. Therefore, the switching switch 14 is held unrotatable within the insulating cylinder 18, and the connecting plate 3
The engagement pin 36a of No. 6 is inserted into the through hole 37b of the connecting plate 37 fixed to the rotation shaft 19, and conversely, the engagement pin 36a of the rotation shaft 1
Since the engaging pin 37b protruding from the connecting plate 37 of 9 is inserted into the through hole 36b provided in the connecting plate 36 of the drive shaft 24, the driving shaft 24 and the rotating shaft 19 are driven and connected in one operation. As a result, the electric operating mechanism 17 is reliably drive-coupled via the rotating shaft 38, the reduction drive mechanism 39, and the reduction gear 40b, and smooth tap switching operations can be performed.

If you also want to inspect the other tap selectors 16 of the switch 14, remove the contents of the switch 14 from inside the insulating tube 18, and then lift the insulating tube 18 to remove the tap selector 16 from inside the case 12. Inspection of the tap selector 16 is performed by pulling up the insulating cylinder 18 with the contents of the switching switch 14 stored.

Since the present invention is configured as described above, it has the following effects.

The present invention provides a fan-shaped molded case that is removably housed in an insulating cylinder, a fixed contact arranged on the inner peripheral surface of the molded case, and a movable contact arranged around the fixed contact opposite to the fixed contact. A movable plate is arranged, and this sector-shaped movable plate is pivoted to a drive hinge fitted to a drive shaft that can be brought into and out of contact with a rotation shaft that is rotatably attached to the molded case and drive-coupled with an electric operating mechanism. A quick-cutting drive mechanism for the fan-shaped movable plate is created by tensioning a storage spring between the contact portion attached through the contactor, the drive hinge, and the free end of the arm whose one end is removably fixed to the drive shaft. When inspecting the contents of the switching switch, the fixed and movable contact portions of the switching switch can be removed by unfastening the insulating cylinder and the molded case.
Since it is possible to pull up the quick-cut drive mechanism part at the same time, inspection of the contents of the switching switch and parts replacement work can be performed quickly and easily.

Also, if it is necessary to further disassemble the contents of the switching switch pulled up from the insulating tube, remove the energy storage spring stretched between the drive hinge and arm, unfasten the arm, and remove it from the drive shaft. Since the movable part of the switching switch, that is, the fan-shaped movable plate, can be easily taken out from the molded case together with the drive hinge, it is easy to separate the fixed contact and the movable contact of the switching switch.
Detailed inspection and repair work is easy, and
It can be done reliably.

Furthermore, in the present invention, the drive hinge and the arm that constitute the quick-cut drive mechanism are both attached to the drive shaft, so that when the drive shaft rotates, the drive hinge does not shift to one side and the energy storage spring is released. The movable plate of each phase can be moved smoothly by effectively utilizing the force of
Moreover, it becomes possible to rapidly rotate the movable contact, and as a result, the movable contact can be accurately switched to the fixed contact. Moreover, since the early cut drive mechanism can be pulled up at the same time as the main body of the switching switch, its inspection work can be easily carried out.

Further, in the present invention, each contact of the switching switch is housed in a molded case, and the quick-cutting drive mechanism is driven and connected to a movable plate having a movable contact among the contact parts through a drive hinge. Since the switching switch can have its movable part and the quick-cut drive mechanism integrally mounted on a pivot, it can be manufactured with a simple structure, small size, and light weight. This makes it possible to reduce the space required to incorporate the on-load tap switching device within the transformer case, making it possible to manufacture a transformer equipped with this type of device in a small, lightweight, and economical manner.

Furthermore, the drive shaft and the rotating shaft drivingly connected to the electric operating mechanism are arranged concentrically within the insulating cylinder, and furthermore, they are provided so as to be removably connected to each other through the connecting plate. In the present invention, when pulling up the switching switch, it is only necessary to pull up the contact portion of the switching switch and the simple-configured quick-cut drive mechanism. Since they can be separated and pulled up individually, the lifting weight can be greatly reduced and the work can be done safely, quickly and easily.

As described above, the switching switch of the present invention allows work such as inspection and repair to be carried out quickly and easily, and transformers with on-load tap switching devices can be manufactured in a small size and economically. It has many remarkable features, such as being able to improve

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing an overview of the on-load tap switching device using a resistive rotary type switching switch;
The figure is a cutaway front view showing the main parts of a conventional switching switch, FIG. FIG. 5 is a plan view of the switching switch of the invention, FIG. 5 is a longitudinal sectional view of the switching switch, and FIG. 6 is a partial vertical sectional view of the on-load tap switching device showing a state in which the contents of the switching switch are taken out. 11...Tap switching device on load, 14...Switching switch, 16...Tap selector, 18...Insulating tube, 21...Mold case, 24...Drive shaft,
26... Drive hinge, 33... Energy storage spring, 35...
...Arm, A ₁ to A ₄ ... Fixed contact, B ₁ to B ₄
...Movable contactor, C ₁ to C ₃ ...Fan-shaped movable plate.

Claims (1)

[Claims] 1 In a transformer case in which a switching switch and a tap selector of an on-load tap switching device are housed and held, a bottomed cylindrical insulating tube is vertically installed in the transformer case. At the bottom of this insulating cylinder, a rotary shaft is rotatably provided to drive and connect with the electric operating mechanism, and within the insulating cylinder above this rotary shaft, a drive shaft is rotatable at a position concentric with the rotary shaft. A movable bottomed cylindrical molded case is removably housed, and fixed contacts are arranged at equal intervals for each phase on the inner peripheral surface of this molded case. A fan-shaped movable plate for each phase with movable contacts arranged on the periphery is housed inside the corresponding molded case, and this fan-shaped movable plate can be driven via a pivot shaft to a drive hinge fitted to the drive shaft. Between the drive hinge and the free end of the arm whose one end is removably fixed to the drive shaft,
A switching switch is constructed by tensioning a storage spring that rapidly rotates the fan-shaped rotating plate, and a drive shaft of the upper air switching switch and a rotating shaft corresponding to the drive shaft are each Connecting plates are mounted facing each other, and engaging pins are protruded from these connecting plates in a staggered manner and facing each other, and through holes to be engaged by the engaging pins are bored respectively, and each of the above-mentioned engaging 1. A switching switch for a tap switching device under load, characterized in that a drive shaft and a rotating shaft are releasably connected and driven by engaging pins in corresponding through holes.