JP2857623B1 - Energy storage mechanism used for switching switch of tap changer under load - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide a power storage mechanism used for a switching switch of a tap changer under load, in which a swingable slave lever directly connected to an output shaft is tilted in one direction and tilted in another direction. It is to provide a structure that can always perform the timing at a certain moment. According to the present invention, a main lever (3) swingable by rotation of a crank (5) is rotated by a predetermined angle, and a swingable slave lever (8) fixed to an output shaft (7) is rotated during rotation of the main lever (3). In the energy storage mechanism used for the switching switch of the tap changer under load, which rotates by a predetermined angle by the force of the tension spring 10 provided between the leading end and one end of the slave lever 8,
A slave lever 8 having an intermediate portion fixed to the output shaft 7 is provided with a tension spring 1
Roller 11 is provided at the other end opposite to the one end where bridge 0 is mounted. At the leading end of main lever 3, a stopper 12 for temporarily preventing rotation of slave lever 8 is provided. From the dead center position to a position at which the rotational force of the slave lever 8 changes from one direction to the opposite direction, and is provided in a state of being pressed against the roller 11 for braking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy storage mechanism used in a switching switch of a tap changer under load, which is a component of a transformer or a voltage regulator.

[0002]

2. Description of the Related Art When a tap change command is generated due to a voltage change, a tap changer under load selects another tap corresponding to the command with a tap selector while keeping the tap currently used in an energized state. After that, the switch is switched by the switching switch to energize another tap.

As shown in FIGS. 4 and 5, an energy storage mechanism used in a conventional switching switch of an on-load tap changer is configured to swing a main lever 92 right and left with rotation of a crank 91. A tension spring 9 is attached to the main lever while swinging.
The slave lever 94 erected at 3 is rapidly rotated to switch the switch. Reference numeral 95 denotes a set of holding members that regulate the swing range of the slave lever.

As shown in FIG. 6A, when the main lever is tilted obliquely downward and leftward, the tension spring applies a rotating force in the counterclockwise direction to the slave lever. It keeps the state tilted to the upper left. Next, move the main lever counterclockwise,
(B) As shown in the figure, at the moment when the slave lever passes through the dead center (the longitudinal direction of the extension spring coincides with the longitudinal direction of the extension lever), the force for rotating the extension lever clockwise is applied to the extension spring. However, since the various parts have frictional force, the slave lever does not tilt in the opposite direction at that moment, rotate the main lever a certain angle from the dead point, the force of the tension spring is greater than the frictional force When it becomes, the slave lever starts to rotate, (c)
As shown in the figure, the camera is tilted obliquely upward to the right. As described above, in the conventional energy storage mechanism, when the force of the tension spring becomes larger than the frictional force, the slave lever starts to rotate, but the frictional force depends on various conditions such as temperature, humidity, or generation of sludge due to use. Since it changes, the start timing of the rotation of the slave lever occurs within a certain period of time after passing through the dead center. In addition, the time required from the generation of the tap switching command to the completion of the switching is, roughly speaking,
This is the total time obtained by adding the switching time of the switching switch to the tap selection time of the tap selector.However, in the case of the conventional mechanism, the starting time is within a certain width, so if the starting time is late within this time, Means that it takes a long time from the generation of the tap switching command to the completion of the switching.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to tilt a swingable slave lever from one state to another direction. Energy used for the switching switch of the on-load tap changer, which can always perform the start timing at a fixed moment, and can shorten the time required from the generation of the tap change command to the completion of the change. Is to provide a mechanism.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a swingable main lever is rotated by a predetermined angle by rotation of a crank fixed to an input shaft. Switching of a load tap changer that rotates a possible slave lever by a predetermined angle more rapidly than the main lever by the force of a tension spring installed between the swinging tip of the main lever and one end of the slave lever. In the energy storage mechanism used in the container, the slave lever having the intermediate portion fixed to the output shaft is provided with a roller at the other end opposite to the one end where the tension spring is provided, and the tip of the main lever is provided at the tip of the main lever. A stopper that temporarily prevents the slave lever from rotating is provided in a state where the roller is braked by pressing the roller from at least the dead center position of the slave lever to a position where the rotational force of the slave lever changes from one direction to the opposite direction. There is a feature.

The dead center position is a position where no rotational force is generated on the slave lever, and more specifically, a position where the longitudinal direction of the slave lever coincides with the longitudinal direction of the tension spring. When the main lever is rotated and passes through the dead center position of the slave lever, a rotational force in the opposite direction is applied to the slave lever, which had been applied in one direction before the rotation, and starts rotating. At this time, the stopper is pressed against the roller to provide braking so that the tension spring can store the force until the rotational force of the slave lever becomes larger than the frictional force that hinders the rotation of the slave lever. become. Also, if the stopper is pressed against the roller to provide braking until the tension spring extends as long as possible after passing through the dead center position, the slave lever will operate at a very high speed as soon as the stopper separates from the roller. It comes to rotate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an energy storage mechanism used in a changeover switch of a load tap changer according to the present invention has an upright plate 1 and a pivot projecting forward from an upper portion of the plate 1. 2, a main lever 3 that connects a base (upper part in the figure) to the pivot 2 and swings left and right around a perpendicular (hereinafter referred to as a reference line) passing through the pivot 2, and a side (right side) of the main lever 3. )
An input shaft 4 provided in parallel with the pivot 2, a crank 5 fixed to the input shaft 4, a connecting rod 6 interposed between a front end of the crank 5 and an intermediate portion of the main lever 3, and directly below the pivot 2. An output shaft 7 rotatably supported so as to penetrate the plate 1 at a height position of an intermediate portion of the main lever 3, and an intermediate portion fixed to a front end portion of the output shaft 7, and left and right around a reference line. And a pair of rod-shaped holding members projecting from both left and right sides of the intermediate portion of the plate 1 directly below the output shaft 7 in parallel with the pivot 2 and restricting the swing range of the slave lever 8. 9, 9 and the leading end (lower end) of the main lever 3 and the slave lever 8
A tension spring 10 that is installed between the upper end of the main lever 3 and holds the slave lever 8 pressed against one of the holding members 9; a roller 11 rotatably provided at the lower end of the slave lever 8; A stopper 12 that is provided at the distal end and is in contact with the roller 11 of the slave lever 8 in a state pressed against the one holding member 9. Reference numeral P denotes a post on which a tension spring is installed.

The above mechanism will be described in more detail. The main lever 3 is disposed in front of the slave lever 8 and hangs below the lower portion of the slave lever 8. A stopper 12 having an L-shaped cross section is provided at the lower end of the main lever 3 so as to contact the roller 11. It is provided in. In order to keep the slave lever 8 from rotating while the stopper 12 is in contact with the roller 11, the stopper 12 causes the surface in contact with the roller 11 to swing as described by the tip surface with the swing of the main lever 3. It is formed in an arc shape that matches the dynamic trajectory. On the other hand, the swing locus drawn by the lower end of the roller 11 is within the range of the middle part of the swing locus of the stopper 12, and only the both ends are the stopper 1
2, and bulges outward with respect to the trajectory of the stopper 12 at other locations. Further, by increasing the width of the contact surface of the stopper 12 with the roller 11, a large force can be stored in the tension spring 10. The both ends of the swing locus of the roller 11 are the positions of the roller 11 when the slave lever 8 is pressed against one of the left and right holding members 9.

The operation principle of the above mechanism will be described with reference to FIG. (A) In the drawing, the main lever 3 hangs obliquely downward to the left. In this state, the rotation of the slave lever 8 is always applied in the opposite direction to the clockwise direction by the force of the tension spring 10. As a result, the slave lever 8 is pressed against the right holding member 9 and holds a state in which the slave lever 8 tilts upward to the left. When the main lever 3 is moved in the direction opposite to the clockwise direction by rotating the crank 5, the stopper 12 of the main lever 3 comes into contact with the roller 11 as shown in FIG. When the main lever 3 is further moved, (c)
As shown in the drawing, the tension spring 10 and the slave lever 8 are parallel to each other. In this state, no rotational force is generated in the slave lever 8, and this is called a dead point of the slave lever 8. Furthermore, main lever 3
Is moved, a clockwise rotational force is generated in the slave lever 8 so that the trailing lever 8 tries to rotate. However, since the trajectory of the roller 11 expands outward from the trajectory of the tip end surface of the stopper 12, this is prevented. Further, as shown in (d), when the main lever 3 is moved until the left end of the stopper 12 and the roller 11 come into contact with each other, the tension spring 10
Is extended most, and a large rotational force is stored in the slave lever 8, the stopper 12 cannot stop the rotation of the slave lever 8, and the slave lever 8 rotates rapidly, as shown in FIG. Then, the slave lever 8 is pressed against the left holding member 9 and tilts upward to the right, whereby the output shaft 7 rotates by a predetermined angle, and the switching operation of the switching switch is performed. Further, as shown in FIG. 8E, when the main lever 3 is moved clockwise from a state in which the main lever 3 is slanted downward to the right in a state where the slave lever 8 tilts upward to the right shoulder, the principle described above is used. As shown in the figure, the slave lever 8 is tilted upward to the left, and the switching operation of the switching switch is performed.

[0011]

According to the present invention, the energy storage mechanism used in the switching switch of the on-load tap changer according to the present invention has the above-mentioned structure, so that the stopper presses the roller while the roller and the stopper are in contact with each other. To prevent the rotation of the slave lever,
Moreover, during this time, the spring can store enough force to rotate the slave lever, and at the moment when the roller and the stopper separate, the stored force is released at once,
The slave lever is rapidly rotated, and thus the start timing of the rotation of the slave lever is reliably determined. In addition, since the starting time is reliably determined, the starting time of the slave lever can be set immediately after the tap selection time of the tap selector,
As a result, the time required from the generation of the tap switching command to the completion of the switching can be shortened as compared with the related art, and furthermore, it is possible to contribute to the supply of a stable voltage.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an energy storage mechanism used in a switching switch of a load tap changer according to the present invention.

FIG. 2 is a left side view showing the energy storage mechanism used in the switching switch of the on-load tap changer according to the present invention.

3 (a), (b), (c), (d), and (e) are front views showing the operation sequence of the energy storage mechanism used for the switching switch of the on-load tap changer according to the present invention.

FIG. 4 is a front view showing an energy storage mechanism used for a conventional switching switch of a load tap changer.

FIG. 5 is a left side view showing a power storage mechanism used in a conventional switching switch of a load tap changer.

6 (a), (b) and (c) are front views showing the operation sequence of the energy storage mechanism used in the switching switch of the conventional on-load tap changer.

[Explanation of symbols]

 3 Main lever 4 Input shaft 5 Crank 7 Output shaft 8 Slave lever 10 Tension spring 11 Roller 12 Stopper

Claims (1)

(57) [Claims] Crank (5) fixed to input shaft (4)
By rotating the swingable main lever (3) by a predetermined angle, the swingable slave lever (8) fixed to the output shaft (7) is moved to the main lever (3) at one time during the rotation. Switching of a tap changer under load that rotates by a predetermined angle more rapidly than the main lever (3) by the force of a tension spring (10) installed between the swinging tip of the arm and one end of the slave lever (8). In the energy storage mechanism used in the switch, a slave lever (8) having an intermediate portion fixed to the output shaft (7) has a roller (11) at the other end opposite to the one end where the tension spring (10) is installed. ) Is provided, and a stopper (12) for temporarily blocking the rotation of the slave lever (8) is provided at the tip of the main lever (3) at least from the dead center position of the slave lever (8). Press the roller (11) to the position where the torque of 8) changes from one direction to the opposite direction. Accumulator mechanism used for diverter switch on-load tap changer, characterized in that is provided in a state of dynamic.