JP3127691B2 - Vacuum valve contact consumption measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a switching switch of a tap changer under load for switching taps of a transformer winding or a reactor winding under a load, and a movable contact applies a contact pressure. The present invention relates to a measuring device for measuring a contact consumption amount of a vacuum valve driven to be closed via a contact spring for wiping.

[0002]

2. Description of the Related Art FIG. 4 shows a configuration example of a drive system around a vacuum valve used in a conventional load tap changer. The vacuum valve 101 has a fixed contact 10 in its vacuum container.
2 and a movable contact 103 that keeps airtight with the vacuum container and moves toward and away from the fixed contact 102. A current extracting terminal plate 104 is attached to the movable contact 103 side.
8, the opening is performed via the insulator 105 and the wiping fitting 112, and the opening drive is performed via the insulator 105 and the wiping fitting 112. The driving member 108 is formed as a cam lever having a cam follower 109 at one end and is rotatably mounted around a fixed shaft 107 of the driving mechanism. The driving member 108 drives the movable contact 103 of the vacuum valve to open and close, and the cam follower 109 is illustrated. The movable contact 103 is held at the position after driving by engaging with the convex portion or the concave portion of the cam plate not to be driven.

[0003] After being operated for a long time and having been opened and closed a number of times, the vacuum valve wears out both of the contacts 102 and 103 and has a long life. Therefore, as shown in FIG. By using a caliper to measure the distance of
Life can be determined. The dimension α measured with a vernier caliper is the maximum value when the article is new, and the dimension gradually decreases with the life.

[0004]

When the space is tightly assembled using a very small space, such as a vacuum valve used in a tap changer under load, a caliper for measuring the dimension α is provided. Providing a space is very difficult in many cases because a current-limiting resistance (not shown) is present in front of the measuring point. Therefore, the dimension α
In order to measure the size α, the current limiting resistor was removed, or in some cases, the vacuum valve that had been assembled mechanically was removed, and each was taken out and a vernier caliper was applied to measure the dimension α. For this reason, the time required to disassemble and reassemble the apparatus is wasted time, and it has become necessary to more easily measure the consumable size.

[0005] An object of the present invention is to directly measure by hand using a simple measuring tool such as a caliper without using an electric means such as a limit switch, a potentiometer or a voltage dividing resistor. Is to configure a device for measuring the amount of consumption to which the simple measuring method can be easily applied.

In order to solve the above problems, in the present invention, a movable contact, which is used in a switching switch of a load tap changer for changing a tap of a transformer winding or a reactor winding under a load, is used. A device for measuring the contact consumption of a vacuum valve that is closed and driven via a contact spring that performs wiping to apply a contact pressure is provided with a movable contact side spring seat integrated or mechanically connected to the movable contact. A drive member side spring seat that is integrated or mechanically connected to a drive member that closes and drives the movable contact via a contact spring, and a contact spring. A driving force from a driving force source for closing the vacuum valve to the vacuum valve so as to form an opposing gap portion in which the gap length changes by an amount consumed when the contact point of the valve is consumed. The contact spring is formed as a cylindrical or frusto-conical coil spring, and the movable contact side spring seat is in contact with the movable contact side end surface of the coil spring. It has a seat surface on its bottom surface and is formed in a cylindrical shape extending in the axial direction of the coil spring and beyond the axial length of the coil spring when the vacuum valve is closed. A first opposing gap portion having a surface facing the side seating surface, wherein the driving member side spring seat is provided inside the cylinder with a driving member side seating surface abutting on the driving member side end surface of the coil spring; And a second opposed gap portion having a surface facing the surface of the first opposed gap portion located near the end face of the extending end of the cylinder.

[0007]

In this case, the first opposed gap portion formed near the extending end face of the cylinder cuts the cylindrical end face in a part of the circumferential direction in the width axis direction, and a plate material having a width including this notch width is formed. It is preferable to form it by abutting the end face of the cylinder including the notch width. In the above configuration, the driving member side spring seat is located axially inward of the extended end face of the cylinder forming the movable contact side spring seat when the contact point of the vacuum valve is in a new state, so that the contact consumption is reduced. It is very suitable to have a surface parallel to the cylindrical end face, which is located outside in the axial direction when the predetermined amount is reached.

[0009]

When the contact wear measuring device is configured as described above,
The components of the drive system from the drive source to the vacuum valve are applied to all the members constituting the device as they are or by partially processing them, so that the measuring device can be configured at extremely low cost. Further, since the opposed gap portion for measuring the consumption amount is formed at a position outside the transmission path of the driving force from the driving force source for closing the vacuum valve to the vacuum valve, it is hindered by the current limiting resistance. The amount of consumption can be easily measured by hand without any need.

In this case, if the contact spring is formed as a coil spring having a cylindrical or frusto-conical shape, both end surfaces of the spring are perpendicular to the axis, the spring is held at a predetermined position in the spring seat, and a vacuum is provided. A spring seat that applies a spring force when the valve is closed is extremely easy to design, and a highly reliable device as a part of a drive system is easily formed.

Therefore, a specific configuration of the contact wear measuring device is described in the following. The movable contact side spring seat is provided with a movable contact side seating surface which comes into contact with the movable contact side end face of the coil spring in the axial direction of the coil spring and in a vacuum. A first opposed gap formed in a cylindrical shape extending beyond the axial length of the coil spring when the valve is in a closed state, and provided with a surface facing a movable contact side seating surface near an extended end surface of the cylinder; A driving member side spring seat is provided inside the cylinder with a driving member side seating surface abutting on a driving member side end surface of the coil spring, and the driving member side spring seat is located near an extended end surface of the cylinder. If a second opposing gap portion having a surface opposing the surface of the first opposing gap portion is provided, both the movable contact side spring seat and the driving member side spring seat are mutually connected as a drive system member. Connection is in the vacuum valve closed state An opposing gap formed between the driving member side end surface of the point spring and the extended end surface of the cylinder forming the movable contact side spring seat is formed in the vicinity of the extended end surface of the cylinder to close the vacuum valve. It will be located at a position outside the drive transmission path from the driving force source for driving to the vacuum valve, and the current limiting resistance will not hinder the measurement of the facing gap,
The contact consumption can be easily measured without removing the vacuum valve.

Further, the opposed gap portion of the movable contact side spring seat formed in the vicinity of the extending end face of the cylinder is notched in the width direction of a part of the cylinder end face in the circumferential direction, and has a width including this notch width. When the plate material is formed by abutting the end surface of the cylinder including the notch width, an opposing gap portion is formed only by performing additional processing on a part of the cylinder constituting the drive system member, and the The main part can be formed at low cost.

When the contact of the vacuum valve is in a new state, the driving member side spring seat is located axially inward of the extended end face of the cylinder constituting the movable contact side spring seat, and the contact consumption is reduced. If a surface parallel to the cylindrical end surface is provided, which is located on the outside in the axial direction when the fixed amount is reached, the parallel surface can be colored, so that the surface can be easily identified from the outside. Thus, after the contact wear has progressed by a certain amount, this surface can be seen from the outside, and the contact replacement time can be estimated in advance, so that the contact can be replaced in a timely manner.

[0014]

1 to 3 show one embodiment of the configuration of a contact wear measuring device according to the present invention. Here, FIG. 1 shows a state in which the contact wear measuring device according to the present invention is included in a drive system of a vacuum valve and constitutes a part of the drive system. A current terminal 4 similar to that shown in FIGS. 4 and 5 and an insulator 5 as a driving force transmitting member are integrated on the atmosphere side of the movable contact of the vacuum valve. The wiping fitting 12 constituting the spring seat is integrated. The wiping fitting 12 is, as shown in FIG.
One end surface is closed and the other end surface is formed in a cylindrical shape with an open end, and a seat surface 14 is formed inside the bottom surface that closes the one end surface to abut against the end surface of the contact spring 6. Note that, in the figure, portions not related to the measurement of the contact wear amount are omitted. The contact spring 6 is housed in a cylinder constituting the wiping fitting 12, and the contact spring 6
A cylindrical external pressure piece 13 which has a seat surface abutting on the right end face of the drive member side spring seat and constitutes a driving member side spring seat is inserted, and the cylinder of the wiping fitting 12 and the cam lever 8 are compressed with the contact spring 6 compressed as shown in the figure. (FIG. 1) are connected by penetrating the shaft 10 through a through hole 12a formed in the cylinder. The through hole 12a is formed larger than the shaft 10, and enables wiping of the contact spring 6 at the end of the closing operation of the movable contact. At this time, the difference between the inner diameter of the through hole 12a and the diameter of the shaft 10 is set within a predetermined contact consumption range. The cylindrical end face of the wiping fitting 12 is notched in the axial direction at a constant width in the circumferential direction, and a notch 16 is formed in the external pressure piece 13 at a position corresponding to the circumferential position of the notch 15. The axially open end of the cylindrical notch 15 is axially closed by a plate 18 fixed in contact with the end surface of the cylinder, and the inner surface of the plate 18 serves as one surface for measuring the contact wear. In addition, a surface parallel to the cylindrical end surface of the notch 16 of the external pressure piece 13 constitutes the other surface, and both surfaces form an opposing gap for measuring the amount of consumption.

FIG. 2 is a view of the vacuum valve in a closed state when the contact is in a new state, and shows a state before the wiping fitting 12 moves to the left as the contact is consumed. FIG. 3 shows a state in which the contacts of the vacuum valve have been worn out for many years and have reached the end of their life, that is, the wiping fitting 12.
Move to the movable contact direction (left direction in the figure), and only the external pressure piece 13 is left at the position from the beginning. The wiping fitting 12 has a right open end face which is notched in the circumferential direction at a constant width and in the axial direction. The external pressure piece 13 also has a notch 16 formed at a position corresponding to the circumferential position of the cylindrical notch 15. I have. Assuming that the contact life consumption dimension of the vacuum valve is β mm, when the vacuum valve is new and the contacts are closed, as shown in FIG. 2, the notches 15 and 16 are designed so that a gap of β mm dimension is formed. Here, a gap gauge is inserted here so that the β mm dimension can be confirmed. When the life of the contact has expired, as shown in FIG. 3, the gap having the dimension of β mm has disappeared, and it has become impossible to insert a gap gauge. Can be done. FIG.
When the right end portion 17 of the external pressure piece 13 is colored in a color that can be easily visually identified, the colored portion that has been retracted by (β-α) from the wiping fitting when the vacuum valve is new as shown in FIG. It can be easily visually observed that it protrudes from the right end by the dimension α mm. The value of the dimension αmm can be arbitrarily set so that the colored portion can be visually confirmed before the gap βmm becomes zero, that is, while the consumption dimension due to a certain number of switching times has a margin before the life.

[0016]

According to the present invention, the contact consumption measuring device for the vacuum valve used in the switching switch of the on-load tap changer is constituted as described above, so that the following effects can be obtained. In the apparatus according to the first aspect, the movable contact performs wiping to apply a contact pressure, and is used in a switching switch of a tap changer under load that switches taps of a transformer winding and a reactor winding under a load. A device for measuring the contact consumption of a vacuum valve that is closed and driven via a contact spring is provided with a movable contact side spring seat integrated or mechanically connected to the movable contact, and a movable contact via a contact spring. A drive member-side spring seat integrated or mechanically connected to the drive member for closing drive and a contact spring are used, and both spring seats have a gap corresponding to the amount of wear when the contact of the vacuum valve is worn. The gap portion is formed so as to form an opposing gap portion having a variable length, and the opposing gap portion is located at a position outside a driving force transmission path from a driving force source for vacuum valve closing drive to the vacuum valve. As a result, the driving system members from the driving force source for the vacuum valve closing drive to the vacuum valve are applied to all the constituent members of the apparatus as they are or with some additional processing. In addition, the apparatus can be configured at extremely low cost. And, since the opposed gap portion forming the gap for measuring the contact wear amount is located at a position deviating from the transmission path of the driving force,
It is possible to measure the amount of wear at a position outside the current-limiting resistance that hindered measurement when using a conventional caliper, and the facing gap length can be formed as narrow as the amount of wear during the contact life. Therefore, a clearance gauge (one in which strips having a predetermined thickness are stacked and bound at one end) can be used for measuring the amount of consumption, and the measurement can be performed more easily. This allows
The time required for disassembly and reassembly of the equipment required in the past is not required, and the measurement of contact consumption can be completed in a short time.
This can contribute to a stable supply of electric power by shortening the operation stop time of the transformer and the reactor.

Further, by forming the contact spring as a cylindrical or frustoconical coil spring, the structure of the device is simplified, and accordingly, the number of required parts is reduced and the device becomes easy to design. A highly reliable device can be provided as a device constituting a part of the drive system. The movable contact side spring seat has a movable contact side seating surface on the bottom surface which abuts on the movable contact side end surface of the coil spring, and has an axial length of the coil spring in the axial direction of the coil spring and in a vacuum valve closed state. And a first opposing gap portion having a surface facing the movable contact side seating surface in the vicinity of the extending end end surface of the cylinder, and the driving member side spring seat includes a coil spring. A drive member side seating surface which is in contact with the drive member side end surface, and a surface which is located inside the cylinder and which faces the surface of the first opposed gap portion which is located near the extended end end surface of the cylinder. By providing the second opposing gap portion, the opposing gap portion formed at a position deviating from the driving force transmission path is formed near the end face of the cylinder constituting the movable contact side spring seat, and the forming position is set to the device. Pair without positioning it separately from the body It is possible to form a gap portion, the apparatus configuration is simplified, it can be an inexpensive device.

According to the second aspect of the present invention, the first opposing gap formed near the extending end face of the cylinder cuts the cylindrical end face in a part of the circumferential direction in the width axis direction, and has a wide width including the notch width. Is formed by contacting the end plate with the notch width including the notch width. Thus, the formation of the opposed gap portion can be realized at low cost. In the apparatus according to the third aspect, the driving member-side spring seat is located axially inside the extended end face of the cylinder constituting the movable contact-side spring seat when the contact point of the vacuum valve is in a new state, and the contact wear amount is reduced. A surface parallel to the cylindrical end surface, which is located on the outside in the axial direction when a predetermined amount is reached. Can be easily estimated in advance, which contributes to timely contact exchange.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a state in which a contact wear measuring device according to the present invention is included in a drive system of a switching switch for a tap changer under load and is part of the drive system.

FIG. 2 is a cross-sectional view showing one embodiment of the configuration of the contact wear amount measuring apparatus shown in FIG.

FIG. 3 is a cross-sectional view showing one embodiment of the configuration of the contact wear amount measuring device shown in FIG. 1 in a closed state of a vacuum valve in which contacts are in a life state;

FIG. 4 is an explanatory diagram showing a state of a conventional drive system configuration around a vacuum valve.

FIG. 5 is an explanatory view showing an example of a conventional contact wear amount measuring method.

[Description of Signs] 1 Vacuum valve 6 Contact spring 8 Cam lever (drive member) 12 Wiping fitting (movable contact side spring seat) 13 Pressing piece (drive member side spring seat) 14 Seat surface 15 Notch 16 Notch 18 Plate 101 Vacuum valve 102 Fixed contact 103 Movable contact 106 Contact spring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-66483 (JP, A) JP-A-57-13635 (JP, A) JP-A-6-13035 (JP, U) 35696 (JP, B1) Jikken 46-37384 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 33/66

Claims (3)

(57) [Claims] 1. A contact spring used in a switching switch of a tap changer under load for switching taps of a transformer winding and a reactor winding under a load, and a movable contact performs wiping to apply a contact pressure. A device for measuring a contact consumption amount of a vacuum valve that is closed and driven through,
A movable contact side spring seat integrated or mechanically connected to the movable contact, and a drive member side spring seat integrated or mechanically connected to a drive member that closes and drives the movable contact via a contact spring. And a contact spring, and both spring seats form an opposing gap portion in which the gap length changes by the amount of wear when the contact of the vacuum valve is exhausted, and the opposing gap portion closes the vacuum valve. The contact spring is formed as a coil spring having a cylindrical or frustoconical shape, which is formed at a position deviating from a driving force transmission path from a driving force source for forming drive to a vacuum valve. The seat has a movable contact side seating surface on the bottom surface that abuts the movable contact side end surface of the coil spring, and has a cylindrical shape extending in the axial direction of the coil spring and exceeding the axial length of the coil spring when the vacuum valve is closed. Formed in Both of the driving members have a first facing gap portion having a surface facing the movable contact side seating surface in the vicinity of the extended end surface of the cylinder, and the driving member side spring seat abuts on the driving member side end surface of the coil spring. A second facing gap portion provided with a side seating surface and located inside the cylinder and having a surface facing the surface of the first facing gap portion located near the extended end face of the cylinder; A device for measuring the consumption of vacuum valve contacts. 2. The apparatus according to claim 1, wherein the first opposed gap formed near the extending end face of the cylinder has a width axis partially extending in a circumferential direction of the cylinder end face. A notch in the direction, and a plate material having a width including the notch width is formed by abutting the cylindrical end face including the notch width to form a contact amount measuring device for a vacuum valve. 3. The cylinder according to claim 1, wherein the driving member side spring seat forms a movable contact side spring seat when the vacuum valve contact is in a new state. Characterized by having a surface located inward in the axial direction from the end surface of the extending end of the slidable member and located outside in the axial direction when the amount of wear of the contact reaches a predetermined amount, parallel to the cylindrical end surface. measuring device.