JPS58111229A - Vacuum breaker switching mechanism for 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 Technical Field of the Invention The present invention pertains to improvements in switching switches constituting load tag switching devices.Technical background of the invention Load tag switching devices (hereinafter referred to as LTC) are ,usually,
Consists of a tag selector and a switching switch - The contacts of the tag selector Fi17, which selects taps in a no-voltage state, will not be damaged by arcing. Transfer switches, which serve to transfer the circuit from the original tag to the next tap selected by When K is open, an arc is generated between the contacts, resulting in severe damage to the contacts. For this reason, switching switches require frequent maintenance and inspection.

As a way to avoid such frequent maintenance, a long-life vacuum interrupter (hereinafter referred to as VC) is installed at the contact of the switching switch.
B) is known.

Figure 1 shows a typical conventional one-resistance, three-pulp type LTC circuit diagram using such a VCB. I! In lI, IFi, Gumakien, T-o, T-yuki,
TI is tag, 2.3 is tag selector, 4 is VCB 5
.

6.7 and a current limiting resistor 8.

When tag selector 2 selects cod fT1, VCII
5 P When the load current is closed, the tap winding l, Tatsu 7' T
Flows through Hs tap selector 2, VCBS.

When switching from this state to evening, fT, KFi first
CB 6 is closed and VCB S is opened to allow the load current to flow through current limiting resistor 8 and VCB 6.
After ゛ is set to idle, VCB s is set to
Switching to the path passing through CB7. By the way, this switching order must always be switched accurately within a short period of several seconds. In this switching process, a circulating current flows across both the Tara fT and the Tatsuzo T, but this circulating current is suppressed through the short-time rated current limiting resistor 8.Next, in such a switching process, The opening/closing mechanism of one of the VCBs 5, 6.7 will be explained with reference to FIG. The VCB 5, 6.7 has a fixed contact 11, an outer wall 12, a nine bellows 13 attached to this outer wall 12, and furthermore Perot JP.
18 and a movable contact 14 attached to the contact point 18.

Lead wires 15 and 16 are connected to the fixed contact 11 and the movable contact 14. In addition, 17 is a cam, 18 is a compression spring 19.2
0 is inserted into the opening/closing lever, 21 is a bracket that supports the opening/closing lever 18, and 22 is a pin 23 attached to the opening/closing lever 18.
It is a roller attached through the. In this case, the compression spring 19 inserted between the opening/closing lever 18 and the plug 21 that supports it is used to interrupt the movable contact 14 so that the load current and circulating current can be easily interrupted when the VCB is opened. This is to increase the speed, and the compression spring 20 is the movable contact 1.
4 to give contact force and wipe amount per contact,
In addition, when the movable contact 14 is worn out, the movable contact 14 is pushed out to compensate for the wear. Movable contact 140
The compression spring 19 is opened and closed by the rotation of the cam 17.
．． 20 is inserted into the opening/closing lever 18, and the nine □ rollers 22 attached thereto are moved in and out.

Figure 3 shows a planar cam 17 having an axis parallel to the axial direction of the VCB, instead of the cam 17 in Figure 2.
Components that are the same as those in FIG. 2 are given the same numbers and their explanations will be omitted. In this case as well, the rotation of the cam 17 opens and closes the movable contact 14 of the VCB in the same manner as in FIG.

Problems with the Background Art As shown in Fig. 2, the disadvantages of the nine opening/closing mechanism are that the VCB
It may be difficult to create a compact design when the number of units installed increases. That is, when constructing a three-phase opening/closing mechanism using one resistance and three pulps as shown in Fig. 1,
It is necessary to arrange nine sets of VCB opening/closing mechanisms three times as many as shown in FIG. 2 radially around the camshaft, and the diameter of the cam etc. becomes very large. Therefore, it is very difficult to place them on a grid. Also, the third
The disadvantages of the nine-close mechanism shown in the figure are that if a large number of VCBs are arranged around the axis of the cam 17, the dimensions of the cam 17 will become very large, and K, which operates instantaneously, is too heavy and unsuitable. It is a certain thing.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a VCH opening/closing mechanism that eliminates the above-mentioned drawbacks and can be integrated into a connector even when the number of pulps increases.

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides an operation method with a fulcrum located between an operating rod having a roller attached to one end that contacts a cam, and a VCH opening/closing lever arranged parallel to the operating rod. When connected via a lever, the movement of the roller in contact with the cam is transmitted via the lever to the opening/closing lever of the VCB, thereby opening and closing the VCB.

Embodiments of the Invention The present invention will be explained below with reference to nine examples of figures. ◇Figure 4 shows a VCB opening/closing mechanism according to an embodiment of the invention. The same reference numerals as in FIG. 3 indicate the same or corresponding parts.

In this embodiment, the opening/closing lever 18 is provided with a pin 25t, a nine rod 27 is provided parallel to the axial direction of this opening/closing lever 18 and connected to an insulating shaft 26, and a tip K of this insulating shaft 26 is provided.
Attach the roller 29 that engages with the N cam 28.In this case, a pin 30 is provided on this rod 27, and a plug y)2 is inserted between this pin 30 and the pin 25 provided on the opening/closing lever 18.
1 has a point Kqi connected to it by an operating lever 32 which is swingably mounted on a pin 31 as a fulcrum.

With the above configuration, when the grooved cam 28 rotates around the shaft 33, the roller 29 fitted to the cam 28 moves in the vertical direction according to the shape of the groove. As a result, the insulated shaft 26 to which the roller 29 is attached moves in the vertical direction, and this movement is transmitted to the movable electrode 14 of the VCH via the p and do 27, the operating lever 32, and the opening/closing lever 18, thereby opening and closing vCB.

Therefore, the above structure 11. Accordingly, the center of the shaft 33 of the d1 cam 28 can be aligned with the axis of the switching switch, and vCB
A large number of can be arranged radially around the axis 33. Also,
Since the dimensions of the cam 280 can be adjusted appropriately, there is an advantage that the weight of the cam 280 can be reduced.

5, 6, and 7 show other embodiments of the present invention, in which FIG. 5 is a front sectional view of the VCII N-barrel mechanism, and FIG. 6 is a view taken along the arrow in FIG. , Figure 7 line B-B in Figure 5
FIG. In addition, since the opening/closing mechanism in FIG. 5 is constructed symmetrically in the upper and lower directions, only one of them will be explained.
A description of the other part is omitted. Throughout each figure, 51 and 52 are supports tightened by studs 54 and nuts 55 with a constant dimension between them secured by spacing tubes 53 inserted between them. , the switching switch mK of the on-load tap changer is mounted by a support member (not shown). A shaft 56 is connected to a drive source (not shown) and rotates, and is rotatably attached to the support 52 via a bearing 57.
58 is li on shaft 56! The slotted cam rotates together with the shaft 56. When the grooved cam 58 rotates, the roller 59 is guided along #lK by K and moves up and down. A roller 59 is rotatably supported at one end of the id 60, and the other end is fixed to a support 51 by a pin 61 and guided by an id pin 62). This guide pin 62 is provided to prevent lateral vibration and horizontal component force that occur when the roller 59 is guided along the groove of the grooved cam 58, and to ensure vertical movement.

One end of the insulating shaft 63 is fixed to the guide 60, and the other end is fixed to the operating port and the drawer 4 via pins 65, respectively. Operation port, drawer 4
has a connecting pin 69 that connects to an operating lever 68 that is connected to an opening/closing lever 66 via a male pin 67. The lever 68 is a plug that engages with the opening/closing lever 66 via a compression spring 70.

) 71 and is rotatably attached to the fixing pin 72 of the f-id 6.
The vertical movement from 0 is transmitted to the opening/closing lever 66. The opening/closing lever 66 has a built-in spring 73, and the spring 73 has one end in contact with the opening/closing lever 66 and the other end in contact with the movable electrode 75 of the VCB 74 to provide the necessary contact between the fixed and movable contacts of the true 9 pulp. Apply load. 76 is the ninth reference rock forming the electrode circuit. The fixed electrode 77 is a terminal terminal 78
is fixed.

With the above configuration, when the shaft 56 rotates, the grooved cam 58 rotates.When the grooved cam 58 rotates, the outer fi of the grooved cam 58 rotates.
The roller 59 fitted in the groove provided in the l direction moves in the vertical direction according to the shape of the groove. As a result, roller 5
9 is installed, but the id 60 moves in the vertical direction, and this movement affects the insulating shaft 63, the operating lever 4-68, and the opening/closing lever 66.
is transmitted to the movable electrode 75 of the VCB 74 via the VCB
74 is opened and closed. At that time, the roller 59 collides with the slope of the grooved cam 58 due to the high speed rotation of the grooved cam 58, and receives a repulsive force, but since it is fitted into the groove of the grooved cam 58, It doesn't bounce as much as a cam platform.

In this way, by arranging the VCB and its opening/closing mechanism on both the upper and lower surfaces of the cam, more Vcats can be arranged than in the fourth factor.
This is even more advantageous in converting the opening/closing mechanism into a compact structure.

Effects of the Invention As described above, according to the present invention, an operating rod having a driving source at one end, and a 7t V
Since the VCBIZ) opening/closing mechanism was constructed by connecting the CB OH closing bars via a lever that has a fulcrum in the middle, it is possible to reduce the dimension from the axis of the camshaft to VCB and the dimension of the cam itself. can. Therefore, an excellent VCB opening/closing mechanism can be obtained which can be constructed in a compact manner and can perform opening/closing operations instantaneously.

[Brief explanation of the drawing]

Figure 1 is a conventional one-resistance, three-pulp type LTC circuit diagram, Figure 2 is a schematic diagram showing an example of an opening/closing mechanism for opening and closing one VCB in Figure 1, and Figure 3 is another conventional opening/closing mechanism. 4 is a schematic diagram of an opening/closing mechanism according to an embodiment of the present invention, FIG. 5 is a front sectional view of an opening/closing mechanism showing another embodiment of the present invention, and FIG. A view in the direction of arrow A, and FIG. 7 is a sectional view taken along line B-B in FIG. 25.30.31.61.62.65.67゜69.7
2...Pin, 26.63...Insulated shaft, 27...Opening, de, 28.58...Juku cam, 29.59-...Roller, 32.68...Operation lever, 33 ...axis, 51
゜52...su/-), 53...interval tube, 54...
Stud, 55...S,), 56...Sha7)%5
7...Bearing, 60...Guide, 64-...Operation prad, 66...Opening/closing lever, 70.73...Pressure/4-ne, 71...Plug, 74-...・VCB,
75...Movable electrode, 76...Leader line, 77...
Fixed electrode, 78...Terminal O Fig. 7 Fig. 2 Fig. 3 Fig. 4 Fig. 61-1 Fig. 7 8

Claims (1)

[Claims] A vacuum interrupter, an opening/closing lever provided on the movable electrode of the vacuum interrupter, an operating rod whose one end is connected to a drive source and arranged parallel to the opening/closing lever, and both ports connected to the opening/closing lever, respectively. An opening/closing mechanism for a vacuum interrupter for changing taps under load, characterized by comprising a lever and an operating lever connected to an operating rod and having a fulcrum in the middle thereof.