JPS5842565B2 - Switching switch for tap switching device on load - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching switch for an on-load tap-changing 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 switching switch conventionally used in on-load tap switching devices is driven at the center of an insulating cylinder 1 in which fixed contacts A1 to A4 of each phase are arranged on the inner peripheral surface. A shaft 2 is provided, and the fixed contact A is mounted on this drive shaft 2.
Three fan-shaped movable plates C□a C2# C3 on which movable contacts B1 to B4 are arranged corresponding to 1 to ^ are attached via the connecting plate 3, and the drive shaft 2 is rapidly rotated. By rotating the fan-shaped movable plates C1, C2, and C3, for example, clockwise in the figure, the movable contacts Bo to B4 are brought into contact with the fixed contacts A1 to A4 in sequence, and the current limiting resistors R1p R2
via the tap selector S1. The taps T1 to T7 of the tap winding 4 are selected by S2.

Thus, the movable contacts B1 to B4 are arranged on the fan-shaped movable plate C1.
The fixed contact A1 is slidably biased outward via a suppressing spring in long grooves provided radially in C3, and when turned on, the fixed contact A1
It is installed so that sufficient contact pressure is maintained.

However, when the movable contacts B1 to B4 are inserted, the fixed contact A is moved by the circular movement of the fan-shaped movable plates C1 to C8, which are pivotally connected to the connecting plate 3 fixed to the drive shaft 2, as the connecting plate 30 rotates. □ to A4, the contact surface of the movable contact is in an inclined state at the initial stage of input and starts contact, and as the fan-shaped movable plate rotates, the contact changes its position on the contact surface and makes contact. or,
The movable contactor slides on the contact surface of the fixed contactor due to lateral pressure acting in the direction of rotation of the sector-shaped movable plate, and the lateral pressure acts on the long groove of the sector-shaped movable plate supporting the movable contactor, causing the long groove to slide. The side edges of the contacts may wear out and play, causing chattering, causing minute arcs to occur on the contact surfaces, causing abnormal wear and tear on the contacts, and deteriorating the insulating oil, requiring frequent maintenance and inspection. Of course, this will significantly shorten the life of the equipment.

The present invention eliminates the above-mentioned drawbacks and allows the contacts to be in complete contact with each other to perform good switching opening and closing without causing chattering or the like. , the same reference numerals will be used to describe the same items.

In the figure, A1 to B4 are fixed contacts disposed on the inner circumferential surface of the insulating tube 1, and B1 to B4 are rotatable by a connecting plate 3 fixed to a drive shaft 2 passing through the insulating tube 1 and a pivot 5. On the outer periphery of the freely pivotally mounted sector-shaped movable plate C□, movable contacts are arranged facing the fixed contacts A1 to A4, and support walls 6 provided concentrically on the sector-shaped movable plate C1 are arranged in the radial direction. A pin 9 is attached to a holder 8 which has a U-shaped cross section and is integrally attached to the tip of a sliding shaft 7 that penetrates through the holder 8.
It is mounted so that it can rotate in the direction of the arrow in the figure.

A circular retaining ring 10 is fixed to the protruding end of the pin 9 protruding from both ends of the holding fitting 8 to prevent removal, and this retaining ring 10 is attached to the outer periphery of the sector-shaped movable plate C□. The movable contact B1 is fitted into the long grooves 11 arranged radially.
can be moved back and forth within the long groove 11 (left and right direction in Figure 3)
I support it.

The sliding shaft 7 is slidably fitted into a spherical bearing 12 and supported by the support wall 6, and a pressure spring 13 is inserted between the spherical bearing 12 and the holding fitting 8. Movable contact B
1 is energized in the radial direction and attached.

14 is a movable contact B adjacent to the bridging portion of the holding fitting 8;
1, as shown in FIG. 4, a spring receiving hole 15 is bored at a position slightly to the side of the center line
The fan-shaped movable plate C1 can be moved from side to side as shown by the arrow in FIG. Since the switching opening and closing is performed by
is on the right side of the center line X, and the two contacts on the left side B3 s
B4 is inserted on the left side of the center line X, and the movable contacts B1 to B4 are configured to be inserted into the holding fitting 8 by tilting them in the charging direction about the pin 9.

Three sets of sector-shaped movable plates equipped with the movable contacts configured as described above are rotatably attached to a drive shaft 2 provided in an insulating cylinder 1 via a connecting plate 3 to constitute a switching switch. It is something.

Next, the operation will be explained with reference to FIG. 5, which representatively shows the operation of the movable contact. The movable contact B1 moves in the holding metal fitting 8 in the closing direction around the pin 9 due to the pressing force of the pressing spring 14. As a result of the rotation of the fan-shaped movable plate C1 caused by the rotation of the drive shaft 2, the center of the contact surface of the movable contact B1 comes into contact with the fixed contact A1, as shown in FIG. As the movable plate C1 rotates, the movable contact B□ contacts the fixed contact A1 at the center position of its contact surface, compresses the push spring 14, and presses the pin 9.
The contact position is not changed as shown by the opening in FIG. 5 (the insertion is completed when it reaches the center line X of the sliding shaft 7, and the connection is complete).

When shutting off, as the fan-shaped movable plate C1 rotates and moves away from the fixed contact A1, the movable contact B1 is tilted within the holding bracket 8 by the push spring 13 without changing its contact position, as in the case of closing, and further rotates into a fan-shaped movable plate C1. By rotating the movable plate C1, it is separated from the tile fixed contact A1.

As described above, in the present invention, the movable contacts arranged on the fan-shaped movable plate so as to be movable back and forth in the radial direction are supported by the holding metal fittings so as to be rotatable left and right through the pins, and the bridging portions of the holding metal fittings A push spring is inserted into one side of the movable contact on the side opposite to the closing direction of the movable contact, and the movable contact is mounted in the holding fitting so as to be tilted in the closing direction.
It is brought into contact with the fixed contact while being tilted in the input direction, and as the fan-shaped movable plate rotates due to the rotation of the drive shaft, it rotates around the pin without changing the contact position and aligns it straight with the sliding shaft. The movable contact is urged toward the fixed contact by a pressure spring provided between the supporting wall of the fan-shaped movable plate and the holding metal fitting, and the movable contact is urged toward the fixed contact side by a pressure spring provided between the supporting wall of the fan-shaped movable plate and the holding metal fitting. Due to the pressure spring installed between the inner surface of the contact,
Since the structure is such that it always contacts the fixed contact in a state tilted toward the closing direction at the beginning of closing, as the fan-shaped movable plate rotates, the movable contact contacts the fixed contact from the start of loading until the closing is completed. Since it can be brought into contact with the fixed contact at the same position without changing the position, unlike conventional
As the sector-shaped movable plate rotates, the contact position of the movable contactor does not change, and no chattering phenomenon occurs at all.

Further, the movable contact is supported by the holding fitting via a pin so as to be rotatable left and right, and the pin is fitted into a long groove provided on the outer periphery of the sector-shaped movable plate so as to be movable back and forth.
The movable contact rotates left and right (switching direction) around the pin, but because the pin is fitted into the long groove,
Since it does not move at all in the rotating direction of the fan-shaped movable plate and can always be brought into contact with the fixed contact at the same position, it is possible to make contact while changing the position on the contact surface as the fan-shaped movable plate rotates. or slide on the fixed contact due to the lateral pressure acting in the rotational direction of the fan-shaped movable plate,
Furthermore, the long groove that receives the movable contact so that it can freely slide in the radial direction is not rattled by the lateral pressure, and no chattering occurs at all, making it possible to ideally insert the movable contact with a simple configuration It is possible to perform cutoff, extend the life of the contact, and prevent deterioration of the insulating oil, significantly reducing maintenance and inspection work, and significantly improving the reliability of power supply.

Furthermore, since the sliding shaft, which has a holding fitting on its tip with a movable contact mounted thereon, is supported through the support wall via a ball bearing, when the sector-shaped movable plate rotates, the sliding shaft is Since it can swing following the movement of the holding fitting using the shaped bearing as a fulcrum, it has many excellent features such as smooth closing and closing operations of the movable contact.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an overview of an on-load tap switching device using a resistive rotary type switching switch, FIG. 2 is a partial plan view partially showing the internal structure of the rotary type switching switch of the present invention, and FIG. Figure 4 is a vertical side view of the movable contact in its installed state, Figure 4 is its top view, and Figure 5 is a top view showing the operating state of the movable contact. FIG. 2 is a diagram showing the state at the time of completion of charging. A1 to A4: Fixed contact, B1 to B4: Movable contact, C1 to C3: Fan-shaped movable plate, 8: Holding metal fitting, 14: Pressing spring, 15: Spring receiver

Claims (1)

[Claims] 1 Movable contacts are arranged on a fan-shaped movable plate in correspondence with fixed contacts arranged in an insulating cylinder, and this fan-shaped movable plate is rotated via a connecting plate attached to a drive shaft to perform switching opening and closing. In such a device, a support wall provided concentrically on the sector-shaped movable plate is attached to a holding metal fitting having a U-shaped cross section attached to the tip of a sliding shaft that penetrates in a radial direction via a ball bearing. A movable contact is attached with a pin so that it can be rotated from side to side, and both ends of the bottle with this movable contact attached to the holding bracket are fitted in the long grooves provided on the outer periphery of the fan-shaped movable plate so that they can be moved back and forth, and the above-mentioned support is attached. A pressure spring that urges the movable contact in the radial direction is inserted between the wall and the holding metal fitting, and the bridging portion is provided on the inner surface of the movable contact adjacent to the bridging portion of the holding metal fitting. A push spring is inserted between the movable contact and the movable contact on one side opposite to the closing direction, and the movable contact is tilted in the closing direction within the holding fitting to perform closing and closing. Switching switch for tap switching device on load.