JPS59189518A - Changeover switch of on-load tap changer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

The resistance type rotary switching switch conventionally used in load tap switching devices has an insulating cylinder/insulating cylinder with 〇 to A4 arranged on the inner peripheral surface for each phase fixed contact, as shown in Figure 17.
A drive shaft λ is provided at the center of the drive shaft 2, and three fan-shaped movable plates C, C2, C3 are arranged on the drive shaft 2, and movable contacts B to B4 are arranged in correspondence with the fixed contacts A to A4. is installed through the connecting plate 3, and the fan-shaped movable plate C is constructed by rapidly rotating the drive shaft 2.

For example, by rotating C2 and C3 clockwise in the figure, the movable contacts B to B4 are brought into contact with the fixed contacts A to A4 in sequence, and the tap selector S is connected via the current limiting resistors R and R2. .

S2 is configured to select taps T to T7 of the tab winding. The movable contactors B to B4 are slidably biased outward via stamp springs j that are radially installed in the spaces within the fan-shaped movable plates C to 03, The input 111 is sunk to maintain sufficient contact pressure with the identification contacts A to A4, and is connected to the three loop-shaped moving plates C1 to C3 and the drive 1.
The drive 11!112 connected to the power supply and mounted on the connecting plate 3
-1 Fang 2 As shown in Fig. 2, it is rotatably supported by upper and lower metal fittings 7a and 7b arranged above and below in an insulating cylinder/in a state connected to the quick cutting drive mechanism B. These upper and lower support fittings 7 and 7'0 are fixed to each other by a series of connecting shafts gK, and are non-rotatably supported by a seat provided inside the insulating cylinder.

However, the conventional switching switch A described above is
As is clear from Figure 2, the fixed contacts A to A4 are attached to the inner circumferential surface of the insulating cylinder, and the moving contacts B to B4 are attached to the inner peripheral surface of the insulating cylinder through the connecting plate 3. Because it is attached to the fan-shaped movable plates C to C3 that are connected to the drive shaft 2 in one drive, when inspecting the inside of the switching switch A, Ijj
The fiJl contacts B to B4 can be easily inspected and buried by 11% by lifting the drive shaft 2 from the insulating cylinder 7, whereas the fixed contacts A to B4 can be easily inspected and buried by 11%. There was no need to worry about removing the tube/itself from inside the case of the transformer (not shown) and inspecting it. For this reason, normally the entire insulating tube was pulled up from inside the case, and then the movable part of the switching switch A was pulled out again from inside the insulating tube for inspection. It takes time and effort
It was ``l ell''. For convenience, fixed contacts A to A41
Since there were several cracks inside the Hayabusa insulation tube, inspection work was extremely difficult. In addition, the switching switch A itself is housed and held in an insulating tube 10 provided separately from the insulating tube 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 amount of storage space is required for the switching switch, and as a result of this, the transformer case becomes large and extremely It was uneconomical.

The present invention eliminates the above-mentioned drawbacks, and when inspecting or repairing a changeover switch of an on-load tap changer, the fixed contact A1S and the movable contact are simultaneously removed from the insulating cylinder of the changeover switch. In addition, the insulating cylinder of the switching switch is configured to have an oil-tight structure, and the inspection work of each contact can be performed quickly and easily. ．． The negative feature is that the transfer device can be stored in the transformer case without the use of dedicated insulation, making it possible to downsize and economically manufacture the transformer case. 11, ''' This is to provide a switching switch for a tap switching device, and the embodiments of the present invention will be described below from Figure 3 to Figure 1 (C). The on-load tap changer j' is housed hanging down in the case /2, and the on-load tap changer iM//U, the switching switch/l, and the connecting part on the lower side of the switching switch/ge)lA15 It is composed of a club selector/B installed vertically through the case/2, and an electric operating device 41Q/7 installed on the outside of the case/2. This insulator 1,17g is connected to the top of the insulating tube by connecting the insulation tube provided outside the open end of the upper part to the open end of the transformer cover bag through the capacitor 3. By fixing the cover 1 with bolts to the cover 1, as shown in Figure 2/3,
%/in "1 danger not t condition hanging inside the case 7",
'j is done. /9 is inserted into the lower open end of the insulating cylinder /g and inserted into the insulating cylinder lf into the medium heat part of the bottom plate 20 that oil-tightly closes the lower blade end of 17g. The rotating shaft, 2/, is a molded case made of epoxy resin and a cylindrical shape with an open top and a bottom, and the molded case, 2/ has fixed contacts A□ to A4 on its outer periphery. is inserted into the insulating tube/ with the fixed contact 22 fixed at the middle of the inner circumference [11]σ) of the insulating tube/g, as shown in Fig. 3. By tightening and fixing the integrally formed mounting piece 23 with a bolt, the molded case 2/ is mounted concentrically and non-rotatably within the insulating cylinder lf. , 2g is mold case 2/r
Bottom E bearing, 2. The above mold case via ff,
, 2/, and a drive hinge ΩB is rotatably fitted to the drive shaft 21 via a bearing. And above, drive hinge, 2nd body jj
jj has an i-ku axis! 7, the fan i movable plate C□~c
3 is rotatably mounted, and each notification type January movement plate C
YiJ movable contacts B□ to B4 are arranged on the outer periphery of □ to C3, facing the fixed contacts 〇 to A4, and the movable contacts B□ to B4 are arranged on the fan-shaped movable plates C□ to c3. A U-shaped holding fitting 30 is integrally attached to the tip of a sliding shaft 29θ) which penetrates the concentric supporting wall and 2g in the radial direction.
It is attached to via pin 3/. And upper Ji
The protruding ends of the pins 37 protruding from both g77 of the holding metal 30 are fitted into long grooves 3Ω arranged radially on the outer periphery of the moving plate C□, and 'X3
A pressing spring 2a is inserted between the supporting wall 2g and the holding metal fitting 30 and θ), which support the movable contacts B□ to B4 in a radial direction. I'm letting you do it. 33
is the driving hinge σ) at the top, one side is the driving hinge Ω
The top 7 of Otsu (IS) is a storage spring that is pivotally supported on the tip of an arm 3S, the other is non-rotatably attached to the upper end of the drive shaft 2t via a key 3, and the storage spring 3S is When the drive shaft 2g rotates, the 7-mm 3S also rotates at the same time, so that it is extended, and when the storage spring 3S reaches its dead center, the fan-shaped movable plates C0 to C3 The movable contact B0 is rapidly rotated by the force of the storage spring 3S via the drive hinge B.
9 changes are made to No'ffB4. 3 Otsu, 37 is drive shaft 2
A connecting plate is fixed to the lower end of the /J and the upper end of the rotating shaft /9, respectively, and one of the connecting plates 3 and 37 has an engaging pin 3a.

37a protrudes in the interchanging direction, and the other side has through holes 3 and 37b through which the engaging pins 3 and 37a are inserted. Then, connect the engaging pins 3a and 37a provided at 37 to each connecting plate 341-
By inserting the through holes 3 and 37U through each of the through holes 7717'l, the drive shaft 11 is drivingly connected to the rotation axis /9 and rotates. In addition, the switching switch/g and the tap selector/o are activated by the electric operation mechanism 77, respectively, so that the rotary shaft 3g = deceleration, the drive mechanism 39 - reduction gear 'lOa, gO
The switching operation is performed while the motor is being rotated at a reduced speed via "b".

In the figure, RIIR2 is a current-limiting resistor inserted between the molded case 2/ and the bottom plate 20, and RIIR2 is a cover of the on-load tap changer//.

Next, we will explain the case of inspecting or cleaning the on-load tap changer//. First, when inspecting, etc., remove the cover t2, and then insert the insulation inside the insulating tube 7g of the changeover switch/g. Remove the oil using a pump, etc. (not shown). After this, remove the bolts fastened to the mounting piece 23 of the fixed contactor A, and then similarly tighten the fixed contactors A to A4 to the molded case 2/. 1
A lifting lobe (not shown) is hooked to a high part 13 provided on a part of the fixed bolt 1, and the molded case 2/ is lifted above the case/2 as shown in Figure 2S. On this occasion,
Since the arm 3S is fixed to the upper end of the drive shaft 24t, the drive hinge 3B does not come off from the drive 11i111.2. As a result, the switching switch /g can be opened and closed separately from the insulating cylinder /g and the contents σ) can all be taken out. In this state, the degree of wear and damage of the fixed contacts A to A and the movable l 4 contacts B0 to ff1B4 is inspected. At this time, that is, movable contacts B□ to 3
4 parts, spring pressure pipe switching switch of pressure spring 29a/4
When inspecting the inside of the DJ moving part σ) in detail, remove the energy storage spring 33, remove the stop plate g+ fixed to the upper end of the drive shaft 2g, remove the key 311, and move the arm 3s.
Drive: lQI+, when removed from the top of 2g, jJlζ
Insect hinge Ω Otsu drives itself 11 still 2 ll
As a result, the movable parts of the switching switch /1 can be removed from the molded case 2/1 and the inside can be inspected easily and in detail.

When the switching switch/l is to be stored in the insulating tube lf again after the switching switch/g has been inspected, it can be easily stored by performing the reverse operation to the one used when taking it out. After storage, the mounting piece 23 is tightened and fixed to the pressure 22 inside the insulating cylinder 1g with a bolt. Therefore, the switching switch /4t is held unrotatable in the insulating cylinder /g, and the through hole 37 of the connecting plate 37 where the engaging pin 3a is fixed to the rotating shaft /9
1J is inserted through this, and conversely, the retaining pin 37b protruding from the rotation shaft/hook connecting plate 37 is inserted into the through hole 3 formed in the driving shaft/hook connecting plate 3. Therefore, switching opening/closing R
The a i p is reliably drive-coupled with the electric operating mechanism/7 via the rotary shaft 3 and the one-speed reduction drive mechanism 39-speed reduction truck group Ob, allowing smooth tap switching work.

4. If you wish to inspect the tap selector/B in addition to the switch switch/g, remove the contents of the switch switch/ll from inside the insulating tube 7g, and then lift the insulating tube/f.
Either pull up the Tsubusawa selector/O from the 2 yen hook, or pull up the insulating tube/g with the contents of the switch switch/g stored and inspect the tap selector/O.

As described in detail below, in the present invention, the switching opening/closing a
A molded case with an opening on the top surface of the insulating cylinder +79 of g is removably divided into several sections, and a fixed contact is arranged on the inner peripheral surface of this molded case, and the inside of the molded case corresponds to the fixed contact. A drive hinge that houses a movable plate (having a movable contact on its periphery) and inserts this fan-shaped movable plate through the center of the molded case and a drive shaft that is releasably connected to the electric operating mechanism. is connected to the drive hinge via a pivot shaft, and the drive hinge and 1. Since the switching switch is constructed by suspending an energy storage spring between one end of the arm that is fixed to the drive shaft and the other end of the arm, inspection work of the switching switch can be carried out in the same way as before. This is completely different from the method in which the insulating tube of the switching switch is lifted up and then the contents of the switching switch are taken out from the insulating tube to perform inspection work, etc., and the present invention can remove the fixed contact without lifting the insulating tube. The structure allows only the molded case with a Moreover, the movable part of the switching switch can be easily removed from the molded case by simply removing the arm that is pivotally connected to the switch (heat-accumulating splash) from the drive shaft. This has the advantage that the inside of the switching switch can be inspected in detail and accurately.In addition, since the top of the molded case is open, the switching switch can be moved easily. Not only can the parts be easily taken out, but the upper support bracket that supports the drive shaft, which is required in the past, is no longer required, so the structure of the switching switch is simplified and economical, and inspection from the outside is also easy. Furthermore, since the molded case is concentrically fixed and supported by the insulating cylinder, even if the drive shaft is only supported at the bottom of the molded case, the rotational force from the electric operating mechanism is will be transmitted to
Due to this force, the drive hinge fitted to the drive shaft can be smoothly rotated by the force of the storage spring without shifting to one side, and it is possible to accurately switch the movable contact to the fixed contact. Furthermore, in the present invention, the insulating π)σ) lower part of the switching switch is oil-tightly sealed by the bottom plate, so unlike the conventional case, the load tap switching device can be built into the case using a dedicated insulating tube. Since there is no need to do so, it is possible to reduce the built-in space for the on-load tap changer inside the case, making it possible to manufacture a compact and lightweight case for the transformer, making it economical, and reducing the need for the transformer (σ). It is also possible to improve the transport limit capacity.

In this way, the changeover switch of the present invention allows inspection, repair, etc. to be carried out quickly and easily, and allows the on-load tap changer to be made compact and economical.
Above, the number of accommodations σ that can improve the transportation marginal capacity)
It has remarkable features.

[Brief explanation of drawings]

Figures 2 and 7 are explanatory diagrams showing the outline of a load tap switching device using a reno switching switch for a resistance type rotary, and Figure 2 is a front view with the ν section of a conventional switching switch cut away, -33 No.
Figure 2 is a cutaway front view showing the main parts of a load tap switching device equipped with the switching switch of the present invention, Figure 1 is a plan view of the switching switch of the present invention, and Figure 23 is a longitudinal section of the switching switch. Figure 1 is a partially vertical front view of the on-load tap switching device showing a state in which the contents of the switching switch are removed. //・Tap switching device on load, /4t・Switching switch, /B・Tap selector, 7g・Insulating cylinder, 2/・Mold case 1.2 &・Drive shaft,
2 B: Drive hinge, 33: Energy storage spring, 3S: Arm, A□ to A4: Fixed contact, B□ to B4: Movable contact, C to C3: Fan-shaped movable plate, Patent applicant Aichi Denki Co., Ltd. Workshop eraser 1 Zuhai 2i '/b Rin 3 Zujin 4 Su 4 iyrr'ts Recitation 6Y

Claims (1)

[Claims] In the case of the transformer, the switching switch and the tap selector of the on-load tap switching device are housed and held, and the insulating cylinder of the switching switch is vertically installed in the case, and the The end is oil-tightly closed with a bottom plate, and a drive shaft connected to an electric operation mechanism and a dissociation RIJ function is inserted into the insulating cylinder through a medium heat, and a molded case with an open top surface can be freely removed. In addition, a plurality of fixed contacts are arranged on the inner peripheral surface of the molded case for each phase, and a movable contact is arranged on the periphery of the molded case in correspondence with the fixed contacts. A fan-shaped movable plate disposed in the 4-shaped movable plate is housed, and the 4-shaped movable plate is connected via a pivot to a drive hinge fitted to the drive shaft, and the upper part of the drive hinge and the upper end of the drive shaft are connected to the drive hinge fitted to the drive shaft. A switching switch for a tap switching device for feeding, which comprises a storage spring stretched between a free end of an arm having one end fixed.