JPS637647B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a tap with a structure in which two fixed contacts are bridged by being inserted between both ends of a pair of movable contacts arranged opposite to each other. This relates to switching contacts.

The sub-switching section of a non-voltage tap changer or an on-load tap changer has a structure in which two of the plurality of fixed contacts are sandwiched between the ends of a pair of movable contacts arranged opposite each other to bridge them. Tap changer contacts are used. There are various shapes of fixed contacts used in this type of tap changer contacts, but in recent years round bar-shaped fixed contacts have been used because they are easy to manufacture. An example of such a tap changer contact will be explained with reference to the drawings. In FIGS. 1 and 2, reference numerals 1 and 1 denote a pair of movable contacts disposed facing each other, which are disposed within a case 2 having a U-shaped cross section.
The pair of movable contacts 1, 1 are provided with guide pins 3, 3 that pass through the case 2, respectively, and springs 4, 4 are provided between the movable contacts 1, 1 and the case 2, respectively. A force is applied in the direction in which the contacts 1, 1 approach each other. Then, the case 2 having the pair of movable contacts 1, 1 is moved to connect two fixed contacts 5, 5 among the plurality of round bar-shaped fixed contacts.
The bridge is formed by sandwiching the two ends of the pair of movable contacts 1, 1.

However, since such tap changer contacts are used in places where the number of operations is relatively small, such as in the sub-change section of a voltageless tap changer or a load tap changer, the contact force of the movable contacts 1, 1 is Spring 4, which gives
4 has a stronger force than that used for the movable contact of the tap selector of the tap changer when the load is switched frequently. Therefore, in such a tap changer contact, when switching the fixed contact, the movable contact 1, 1 due to the contact force of the movable contact 1, 1.
Not only is a large driving force required to overcome the friction between the contact point 1 and the fixed contacts 5, 5, but also the fixed contacts 5, 5 are susceptible to wear and deformation.

The present invention has been made to eliminate the above-mentioned drawbacks, and provides a tap changer contact that requires less driving force and reduces wear by reducing the frictional force when driving the movable contact. The purpose is to

An embodiment of the present invention shown in the drawings will be described below. 3 is a front view showing a tap changer contact according to an embodiment of the present invention, and FIG. 4 is a side view of FIG. 3. In FIGS. 3 and 4, reference numerals 11 and 21 indicate a pair of movable contacts arranged vertically opposite each other, and on the contact surface of one of the movable contacts 11, there is an arrow mark at a position from one end to the center. Movable contact 1 shown by
A protrusion 11 extending along the moving direction of 1 and 21
a, 11b are provided spaced apart in a direction perpendicular to the moving direction of the movable contacts 11, 21, and protrusions 11a, 11b are provided at a position from the other end to the center.
Similarly to 11b, a protrusion 11c is provided at a position that is shifted in a direction orthogonal to the moving direction of the movable contacts 11 and 21 and does not overlap. The other movable contact 21 is the same as the movable contact 11, but the protrusions 21a and 21b of the movable contact 21 are the protrusions 11c of the movable contact 11, and the protrusions 21c of the movable contact 21 are the protrusions of the movable contact 11. The movable contacts 11 and 21 are arranged to face each other in positions along the moving direction of the movable contacts 11 and 21, respectively. That is, the protrusions of the pair of movable contacts 11 and 21 sandwiching one fixed contact are all offset in a direction perpendicular to the moving direction of the movable contacts 11 and 21. These movable contacts 11, 12
are disposed in a case 2 having a U-shaped cross section, and force is applied by guide pins 3, 3 and springs 4, 4 in a direction in which they approach each other. The pair of movable contacts 11 and 21 are driven by a drive mechanism (not shown) via the case 2 and the guide pins 3 and 3.
On the other hand, 15, 15 are two fixed contacts to be bridged, and each fixed contact 15, 15 has three conductive rings 15a, 15b, 15c rotatably attached to the tip thereof. There is. These rings 15a,
15b and 15c, the ring 15a is the protrusion 11a of the movable contact 11 or the protrusion 21b of the movable contact 21.
and the ring 15b is connected to the protrusion 11c of the movable contact 11 or the protrusion 21c of the movable contact 21, and the ring 15c
is the protrusion 11b of the movable contact 11 or the movable contact 2
The protrusions 21a of the protrusions 21a and the protrusions 21a of the protrusions 21a of the protrusions 21a of the protrusions 21a of the protrusions 21a of FIG. Note that these rings 15a, 15b,
15c is prevented from falling off by a retaining ring 7.

Next, the operation of the tap changer contacts constructed as described above will be explained. Now, when the movable contacts 11, 21 are driven in the direction of the arrow from the state shown in FIG.
c and the ring 15b of the fixed contact 15 on the left side of the figure,
In the figure, the ring 15b of the fixed contact 15 on the left side of the figure, which is in contact with the protrusions 21a to 21c of the movable contact 21, and the rings 15a, 15c of the fixed contact 15 on the left side of the figure, are in the counterclockwise direction in the figure. It will rotate respectively. Therefore, each ring 15a to 15c acts as a liner between the movable contact and the fixed contact, so the frictional force is small.
Smooth operation can be obtained. Therefore, a tap changer contact with low driving force and low wear can be obtained.

Next, another embodiment of the present invention will be described. FIG. 5 is a front view showing another embodiment of the present invention, and FIG. 6 is a front view showing another embodiment of the present invention.
FIG. 4 is a side view of the figure, in which parts having the same functions as the embodiment of FIGS. 3 and 4 are designated by the same numerals. In this embodiment, movable contacts 11 and 2
1, two contact protrusions, 11d, extending along the moving direction of the movable contacts 11, 21, spaced apart in a direction orthogonal to the moving direction of the movable contacts 11, 21, and located at positions such that they do not overlap; 11e and 2
1d, 21e are provided, and each fixed contact 15, 15 is provided.
Each of the four circular rings 15a to 15d is rotatably attached to each ring. The protrusion 11d of the movable contact 11 is connected to the rings 15d, 15d of the fixed contacts 15, 15, and the protrusion 11e is connected to the rings 15b, 15b of the fixed contacts 15, 15, and the protrusion of the movable contact 21 21d is each fixed contact 1
The rings 15a, 15a of the fixed contacts 15, 15 and the protrusion 21e are the rings 15c, 1 of the fixed contacts 15, 15.
5c, respectively.
Therefore, in the tap changer contact configured in this way, each ring 15a to 15d is connected to the movable contact 1.
1, 21 and fixed contacts 15, 15 to act as a liner, similar effects can be obtained as in the embodiments shown in FIGS. 3 and 4.

In addition, in the above embodiment, the movable contacts 11 and 2
Although a plurality of protrusions are formed on each movable contact, one protrusion may be formed on each movable contact at shifted positions, and the fixed contact may be sandwiched between a pair of protrusions. However, this case is slightly inferior to the first and second embodiments in terms of the balance of forces that pinch the fixed contacts.

As described above, according to the present invention, a pair of movable contacts are provided with protrusions at positions shifted from each other in a direction perpendicular to the direction of movement of the movable contacts, and the protrusions are rotatably attached to the respective fixed contacts. By making the contact point correspond to one of the plurality of circular rings, frictional resistance during driving is reduced, and therefore, a tap changer contact point with low driving force and low wear can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional tap changer contact, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a front view showing an embodiment of the tap changer contact according to the present invention.
4 is a side view of FIG. 3, FIG. 5 is a front view showing another embodiment of the present invention, and FIG. 6 is a side view of FIG. 5. 1, 11, 21...Movable contact, 2...Case,
3...Guide pin, 4...Spring, 5, 15...Round bar-shaped fixed contact, 15a to 15d...Circle, 11
a to 11e and 21a to 21e... protrusions,
7...Retaining ring.

Claims (1)

[Claims] 1 Consisting of a pair of movable contacts and a plurality of round bar-shaped fixed contacts, two of the round bar-shaped fixed contacts are respectively sandwiched between both ends of the pair of movable contacts and are bridged to conduct electricity. In the tap changer contacts, the pair of movable contacts are provided with contact projections at positions shifted from each other in a direction perpendicular to the moving direction of the movable contacts, and the fixed contact is provided with at least one of the pair of movable contacts. A number of rings corresponding to each of the projections are rotatably mounted, and the fixed contact and the movable contact are brought into contact by the projections of the movable contact contacting each of the rings. Features a tap changer contact.