JPH0349382Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a tap switching direction detection device for detecting the switching direction of a tap changer under load in order to investigate the cause of an accident.

[Conventional technology]

FIG. 4 shows a conventional tap changer direction detecting device. In the figure, a breaker 1 protects the tap changer drive device from, for example, overload when loaded, and is normally closed. The ascending direction contact 2 and the descending direction contact 3 are closed by the ascending direction signal and the descending direction signal from the control panel 4, respectively, which switch the taps of the load tap changer in the ascending direction and the descending direction. The ascending relay coil 5 and the descending relay coil 6 are connected in series to the ascending direction contact 2 and the descending direction contact 3, respectively, and are energized when the ascending direction contact 2 and the descending direction contact 3 are closed. The drive motor 7 switches and drives the tap in the upward direction when the make contact 5 _a1 , which is closed when the ascending relay coil 5 is energized, drives the make contact 6 _a1 , which is closed when the descending relay coil 6 is energized. When closing, the tap is switched and driven in the downward direction. The rising indicator lamp 8 is the make contact 5 of the rising relay coil 5.
_a2 , and the descending indicator lamp 9 is connected in series to the make contact 6 _a2 of the descending relay coil 6.

Next, the operation will be explained. Now, when the upward direction contact 2 is closed, the upward relay coil 5 is energized, its make contacts 5 _a1 and 5 _a2 are closed, and the drive motor 7 starts switching the tap in the upward direction and starts driving, and at the same time the upward display lamp 8 is turned on to display on the control panel 4 that the tap is being switched upward. Similarly, in the descending direction, the descending indicator lamp 9 is turned on.

[Problem that the invention attempts to solve]

Since the conventional device is configured as described above, when the power supply to the drive motor 7 or the power supply for the rising and descending indicator lamps 8 and 9 is cut off, or when the breaker 1 is opened due to an accident such as overload, and even when the rising ,
When the descending indicator lamps 8 and 9 burn out, the ascending and descending indicator lamps 8 and 9 do not light up, and there is a problem in that it is not possible to confirm in which direction the tap is being switched.

This idea was made to solve the problems of the conventional ones as mentioned above, and it detects the direction of tap switching so that it can be confirmed in which direction the tap is being switched even during a power outage or when the breaker is opened. The purpose is to obtain equipment.

[Means for solving problems]

The tap switching direction detecting device according to this invention has a concave portion on the outer periphery, and the tap switching direction detecting device has a concave portion on the outer periphery, and detects one tap in one direction when switching up and in the other direction when switching down.
A cam rotates 360 degrees, and one end slides on the outer periphery of the cam, and when the tap switching of the cam is completed, the one end comes into contact with the recess, and the other end shows an upward display in one direction. It is equipped with a movable arm with a descending indication on the other direction side.

[Effect]

When the cam rotates in one direction during upward switching, the other end of the movable arm swings in the other direction to clearly indicate the upward movement attached to one side of the other end, and when the cam rotates in the other direction during downward switching. When the movable arm rotates, the other end of the movable arm swings in one direction to clearly display the descending display attached to the other end.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings. 1A and 1B are a plan view and a front view showing an embodiment of the tap switching direction detecting device according to the present invention. In the figures, a cam 10 has a recess 10a on the outer periphery, and when the tap is switched upward, the cam 10 is direction, and when the taps are switched downward, for example, counterclockwise, it rotates 360 degrees for each switch of one tap. The movable arm 11 is rotatably supported by a shaft 12 in the center, and a roller 13 supported at one end 11a is disposed so as to be in sliding contact with the outer periphery of the cam 10. A rising display 11c such as the characters "rise" is attached to the direction side,
Descending display 11 such as the characters "descending" on the other direction side
d is attached. The tension spring 14 is the movable arm 1
The movable arm 11 is held in a stationary state as shown in FIGS. 1a and 1b when the roller 13 contacts the recess 10a. The window frame 15 displays a rising display 11c and a descending display 11d at its opening 15a.

Next, this operation is shown in Fig. 2 a, b and Fig. 3 a, b.
Explain using. In the stationary state shown in FIGS. 1a and 1b, when the tap switching is completed, the window frame 15
Neither the rising display 11c nor the descending display 11d is displayed in the opening 15a. In this state, the cam 10 is moved to the second position by switching the tap upward.
When the roller 13 is rotated clockwise as shown by arrow A in FIG. Therefore, the movable arm 11 rotates clockwise about the shaft 12 as shown by the arrow B, and the rising display 11c attached to one side of the other end 11b is displayed on the opening 15a of the window frame 15. be done. In this case,
Even if the cam 10 stops during tap switching due to a power outage, etc., the movable arm 11 will maintain the states shown in Fig. 2 a and b.
The rising display 11c continues to be displayed in the opening 15a. Further, when the tap switching is completed and the cam 10 rotates once, the roller 13 comes into contact with the recess 10a, and the spring force of the tension spring 14 brings the roller 13 into the stationary state shown in FIGS. 1a and 1b.

On the other hand, in the states shown in FIGS. 1a and 1b, when the cam 10 rotates counterclockwise in the direction of arrow C shown in FIG. 3a by lowering the tap, the roller 13
comes off from the recess 10a of the cam 10 and slides along the outer periphery of the cam 10. Therefore, the movable arm 11 rotates clockwise about the shaft 12 as shown by arrow D, and the lowering display 11d attached to the other end 11b is displayed on the opening 15a of the window frame 15. be done. In this case, even if the cam 10 stops during tap switching due to a power outage or the like, the movable arm 11 maintains the state shown in FIGS. 3a and 3b, and the descending display 11d continues to be displayed in the opening 15a.

[Effect of idea]

As described above, according to this invention, the movable arm that displays the tap switching direction is rotated by the cam that rotates once in one direction and the other direction each time the tap is switched between the upward and downward directions. Therefore, the tap switching direction can be displayed without being affected by power outages, etc., and the reliability is improved and the configuration can be made at low cost.

[Brief explanation of the drawing]

FIG. 1a is a plan view showing an embodiment of the tap switching direction detecting device according to this invention, FIG. 1b is a front view of FIG. 1a, and FIGS. 2a, b, and 3a, b are FIG. 4, which is an explanatory diagram of the operation of this invention, is an electrical wiring diagram showing a conventional tap switching direction detecting device. In the figure, 10 is a cam, 10a is a recess, 11
is a movable arm, 11a is one end, 11b is the other end, 1
1c is a rising display, 13 is a roller, 14 is a tension spring, and 15 is a window frame. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A cam that has a recess on its outer periphery and rotates 860 degrees in one direction when switching up and in the other direction when switching down, and one end on the outer periphery of the cam. a movable arm whose one end abuts the recess when the cam is in sliding contact and the tap switching of the cam is completed; a tension spring which holds the movable arm stationary when the one end abuts the recess; A tap switching direction detection device comprising a window frame for displaying one direction in which the other end of the movable arm is displayed as rising and the other direction in which the other end of the movable arm is displayed as falling when rotating in one direction and the other direction. (2) The tap switching direction detection device according to claim 1, wherein one end of the movable arm slides into contact with the outer periphery of the cam via a roller.