JPH11297541A - Tap position display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tap position display device for a tap switcher capable of displaying the tap position of a tap switching transformer, having 3 kinds of rated voltages allowed to be switched. SOLUTION: In side a surface plate 2 comprising a display window 3 in front of a tap position display plate 1, a slide shutter 4 in which a front side slide shutter 5 is provided in the front, while a rear side slide shutter 6 in the rear for fitting in stack, is fitted to a rail which allows sliding, and when a rated voltage is switched, the position of the front side slide shutter 5 and the rear side slide shutter 6 are switched over by a manual or automatic control with a control circuit for displaying of each rated voltage and the tap position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tap position display device for a load tap changer with a rated voltage switch of a three-rated transformer.

[0002]

2. Description of the Related Art At present, special transformers such as mobile transformers and test transformers have long been required to be used according to various regions and purposes. A more precise voltage adjustment is performed by combining a load tap switching device. For example, there is an increasing demand for a tap switching device that can supply power to various regions and that can switch a rated voltage, such as a mobile transformer.

FIG. 13 is a configuration diagram of a tap position display device of a conventional electric operation mechanism of a tap change device under load, which comprises a stop position indicating plate 31, an operation frequency recorder 32, and a tap position display plate 33. , Tap position display function is 1
Since there is only one type, it cannot be applied to a tap switching device of three ratings.

Next, FIG. 14 is a front view of a tap position display plate of a tap position display device of a conventional electric operation mechanism of a tap change device under load. The display of the rated voltage after switching or the position of the tap at the rated voltage cannot be performed.

[0005]

As described above, the prior art tap position display device corresponds to the tap position display device of the tap switching device in which one transformer switches to three types of rated voltages. There was a problem that can not be.

The present invention has been made in view of the above-mentioned problems of the prior art, and is a tap changer capable of displaying a tap position of a tap change type transformer capable of switching between three types of rated voltages. It is an object of the present invention to provide a tap position display device.

[0007]

According to the present invention, a means for solving the above-mentioned problems is provided by a tap position display plate of a tap position display device provided in an electric operation mechanism of a load tap changer of a transformer. The scale to display the tap position on the outer circumference is 3
5 with the second rated voltage 3
A disc is provided with a tap position display scale at the time of 3 kV operation, a tap position display scale at the time of the third rated voltage 22 kV operation at the inner side, and a tap position display scale at the time of the first rated voltage 77 kV operation at the innermost circumference. A tap window corresponding to the first, second, and third types of rated voltage is displayed by displaying the tap position at each rated voltage by displaying the tap position at each rated voltage, and having a display window. A front slide shutter is disposed in front of the front slide shutter, a rear slide shutter is disposed rearward and mounted on the front plate, and the front slide shutter is provided with a rated voltage of "33 kV" and two viewing windows. The slide shutter has rated voltages of “77 kV” and “2
A 2 kV display and three viewing windows are provided, and a tap position display plate is disposed behind the two slide shutters. The operation of the slide shutter causes the rated voltage and the tap position number from the display window on the front plate. A slide shutter that allows the user to view the tap position corresponding to the rated voltage for use, arranges this slide shutter movably on the rail, and displays the rated voltage for use and the tap position manually or electrically. Is displayed.

With this configuration, the tap position at each rated voltage can be confirmed, and the current rated voltage and the corresponding tap position can be confirmed from the tap position display device.
This allows the electric control to be performed and the display of the current rated voltage and the display of the tap position to be automatically switched with the switching of the control switch.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present applicant has filed Japanese Patent Application No. Hei 8-14685.
No. 3 proposed a tap switching device capable of switching to three types of rated voltages with one transformer by switching a non-voltage tap switch. A drive ring is attached to a drive shaft inserted into the transformer tank, and a pair of driven rings are alternately rotated by driving the drive ring. Switch the connection between each fixed contact connected to the end of each winding part,
Switching of three types of rated voltages is performed. In addition, each fixed contact connected to the end of each divided winding portion or the terminal of the transformer winding is connected or disconnected by each movable contact driven as described above.
The type of rated voltage is switched.

FIG. 1 is a relationship diagram showing an example of the relationship between the connection and the tap position of the on-load tap switching device with a sub-switch of 35 taps of a 3 rated voltage switching transformer. The first rated voltage is 77 kV.
During the operation of, the on-load tap changer assigns 17 taps from 1 to 33 tap positions out of a total of 35 taps, one tap at a time.

During the operation at the second rated voltage of 33 kV, the on-load tap changer switches 1 to 17 out of all 35 taps.
17 taps are allocated up to the tap position.

Further, during operation at the third rated voltage of 22 kV, the on-load tap changer has 25 to 25 out of 35 taps.
By assigning up to 35 tap positions to 11 taps,
Switching of three types of rated voltages is made possible.

[0013] The present invention relates to a tap position display device used in a transformer of three rated voltage switching.
The present invention will be described based on an embodiment shown in the drawings.

Since the tap position display plate 33 of the tap position display device of the conventional electric operation mechanism of the on-load tap changer shown in FIG. I do not know the position of the tap on the. Therefore, the present invention proposes a new tap position display device.

FIG. 2 is a front view of a tap position display plate in the tap position display device of the present invention. As shown in FIG. 2, in the tap position display device provided in the electric operation mechanism of the load tap changer of the transformer. On the outermost circumference, the scale for displaying the tap position is a full-scale scale of 35, inside it is a 17-tap scale for displaying the tap position at the time of the rated voltage of 33 kV operation, and further inside thereof is the tap position for the operation at the rated voltage of 22 kV. The 11-tap scale to be displayed is displayed on the innermost circumference, along with the 17-tap scale indicating the tap position during operation at the rated voltage of 77 kV, on the disk-shaped tap position display plate 1 so that the tap position at each rated voltage is displayed. Thus, tap position display corresponding to three types of rated voltages is enabled.

FIG. 3 is an exploded view of the slide shutter in the tap position display device of the present invention. As shown in FIG. 3, the front slide shutter 5 is arranged in front and the rear slide shutter 6 is arranged in back (back). The slide shutter 4 is mounted so as to be movable back and forth in the left and right directions in the figure. (See FIG. 8) The front slide shutter 5 has the second rated voltage “3”.
3 kV ”display and viewing windows 7 and 8 are provided, and the first rated voltage“ 77 k
"V" and a third rated voltage "22 kV", and viewing windows 9, 10 and 11 are provided.

The rear side of the slide shutter 4 is provided with a tap position display plate 1 shown in FIG. 8, and the front side thereof is provided with a surface plate (rotating door) 2 having a display window 3. From the front window 3, the display of the rated voltage and the tap position number (hereinafter, referred to as a tap position display scale) can be seen.

The relative positions of the viewing windows 7 to 10 of the front and rear slide shutters 5 and 6 are as follows.

The viewing windows 7 and 9 are positions where the rotating tap position display plate 1 allows the user to look at the tapped position display scale of the second rated voltage of 33 kV, and the viewing window 8 is the first rated voltage of 77 kV and the position of the rear slide shutter 6. 77kV "display,
The viewing window 10 is provided at a position where the tap position display scale of the third rated output pressure 22 kV can be viewed.

The front and rear slide shutters 5 and 6 are movable left and right in FIG. 8 as shown in FIG.

The front surface plate 2 is a rotating door, and the display window 3 is a window slightly wider than the viewing window 8.

Next, the operation of the slide shutter and the display of the tap position display scale will be described with reference to FIGS.

FIG. 4 is a front view showing the state of the slide shutter during operation at a rated voltage of 77 kV, and FIG.
Front view showing the state of the slide shutter during 3 kV operation,
FIG. 6 is a front view showing the state of the slide shutter during operation at the rated voltage of 22 kV.

FIG. 4 shows a state in which the front slide shutter 5 and the rear slide shutter 6 are superimposed on the proper positions (the center lines of the viewing windows 8, 9, and 10 are aligned) from the viewing window 8 of the front sliding shutter 5. "7" of the rear slide shutter 6
7 kV "can be seen, and the viewing window 8 of the front slide shutter 5 and the viewing window 11 of the rear slide shutter 6 can be seen.
The tap position display scale of 77 kV of the tap position display plate 1 can be seen through.

At this time, the display 22 kV of the rear slide shutter 6 is hidden by the front slide shutter 5, the display “33 kV” of the front slide shutter 5 is hidden by the front panel 2, and FIG. 77 as shown
Only the display of kV and the first rated voltage 77 kV tap position display scale are visible.

Next, as shown in FIG. 5, when the front slide shutter 5 and the rear slide shutter 6 are overlapped with each other, the front slide shutter 5 is slid to the left from a normal position during operation at a rated voltage of 77 kV. From the display window 3, a 33 kV tap position display scale of the tap position display plate 1 can be seen through an overlapping portion of the observation window 7 of the front slide shutter 5 and the observation window 9 of the rear slide shutter 6.
Only the display of "33 kV" of the front slide shutter 5 is visible, and shows a state at the time of the rated voltage 33 kV operation.

Further, when the rear slide shutter 6 is slid to the left from the normal position shown in FIG. 4, as shown in FIG.
The tap position display scale of 22 kV of the tap position display plate 1 can be seen through the overlapping portion of the viewing window 10 of the rear slide shutter 6 and the “22 kV” of the rear slide shutter 6 through the viewing window 8 of the front slide shutter 5.
Becomes visible, and shows the state during the operation at the rated voltage of 22 kV.

As described above, by sliding the front slide shutter 5 and the rear slide shutter 6, it is possible to display the rated voltage and the tap position corresponding to the switching of the three rated voltages.

As the operation method of the slide shutter, there are a manual operation and an operation method using a solenoid.
First, the manual operation will be described.

FIG. 7 is a front view of a tap position display device with a slide shutter attached in the tap position display device of the present invention. The tap position display plate 1 is hidden by the front plate 2, and only the tap position display scale is displayed from the display window 3. appear. The manual operation of the slide shutter will be described. In FIG. 7, a slide shutter 4 having a front slide shutter 5 disposed in front and a rear slide shutter 6 disposed rearward and mounted on a surface plate 2 having a display window 3 in front of a tap position display plate 1 is attached. Attached to a slidable rail (not shown), and when the rated voltage is switched, the front slide shutter 5 and the rear slide shutter 6 are manually switched to perform the shutter operation shown in FIGS. Thereby, the display of each rated voltage and the display of a tap position become possible.

FIG. 8 is a top view for explaining the operation of the solenoid of the tap position display device provided with the slide shutter in the tap position display device of the present invention. In FIG. , A slide shutter 4 in which a front slide shutter 5 is disposed in front and a rear slide shutter 6 is disposed in rear, and a tap position display plate 1 is disposed behind the slide shutter 4. A front solenoid 12 is attached to one end of the front slide shutter 5, and a front spring 14 is attached to the other end. A rear solenoid 13 is attached to one end of the rear slide shutter 6, and a rear spring 15 is attached to the other end.

FIGS. 9 to 11 are views showing the positional relationship of the slide shutter of the tap position display device to which the slide shutter is attached in the tap position display device of the present invention.

FIG. 9 is a front view showing a state during operation at a rated voltage of 77 kV. In FIG. 9, when both the front solenoid 12 and the rear solenoid 13 are in the non-excited state, the front slide shutter 5 and the rear slide shutter 6 are turned off. Are in the normal position, and show the state at the time of the rated voltage 77 kV operation in FIG.

FIG. 10 is a front view showing a state at the time of operation at a rated voltage of 33 kV. In FIG. 8, the slide shutter 5 is slid to the left while the front solenoid 12 is excited and the slide shutter 5 is slid to the left when the rear solenoid 13 is not excited. 6 is a normal position, and shows a state at the time of the rated voltage 33 kV operation of FIG.

FIG. 11 is a front view showing a state during operation at a rated voltage of 22 kV. In FIG. 8, the front solenoid 12 is de-energized and the slide shutter 5 is set at a normal position.
FIG. 6 shows a state at the time of operation at a rated voltage of 22 kV in FIG. 6 with the rear solenoid 13 being excited and the slide shutter 6 being slid to the left.

When the respective solenoids 12 or 13 are released, the respective slide shutters 5 or 6 are released.
Has a structure to return to the normal position by the force of the spring 14 or 15, respectively.

FIG. 12 is a circuit diagram of a control circuit of the tap position display device in the tap position display device of the present invention.
As shown in FIG.
A selector switch 16 for circuit switching is connected, a selector switch terminal 17 of the selector switch 16 is connected to a power source R, and a selector switch terminal 18 is connected to a relay 21.
And the selector switch terminal 20 is connected to the power source T via a relay 22, and the central selector switch terminal 19 is open.

Further, between the power sources R and T, a circuit for connecting the contact 23 via the front solenoid 12 and a circuit for connecting the contact 24 via the front solenoid 13 are provided.

During operation at a rated voltage of 77 kV, the selector switch 16 is connected to the center selector switch terminal 19 and is not connected to the power supply T because it is open.
The solenoids 12 and 13 are both in a non-excited state, and the slide shutters 5 and 6 are at their normal positions.

During operation at a rated voltage of 33 kV, by connecting the selector switch 16 to the selector switch terminal 18, the relay 21 is excited and the contact 23 is connected, so that the front solenoid 12 on the 33 kV side is excited, and the front slide shutter is operated. 5 is configured to slide.

During operation at the rated voltage of 22 kV, by connecting the selector switch 16 to the selector switch terminal 20, the relay 22 is excited and the contact 24 is connected, so that the rear solenoid 13 on the 22 kV side is excited. The rear slide shutter 6 slides.

By incorporating this control circuit, the display of the rated voltage and the display of the tap position of the tap position display device can be automatically switched in accordance with the switching of the rated voltage of 77 kV / 33 kV / 22 kV.

Thus, the tap positions corresponding to the respective rated voltages can be accurately displayed on the display window 3 as shown in FIG.

The voltage is 77 kV / 33 kV / 22 k
Not only V but also other voltage combinations can be applied.

[0045]

Since the tap position display device of the present invention is configured as described above, the following effects can be obtained.

(1) By using the tap position display plate indicating the tap positions corresponding to the rated voltages, the tap positions at each rated voltage can be confirmed. At that time, the tap position in the radial direction and the display position of the rated voltage are 77 kV, 22 kV, and 33 kV from the inside in the drawing, but any order can be adopted.

(2) The rated voltage and the corresponding tap position can be confirmed and grasped from the tap position display device by indicating the rated voltage and combining two slide shutters having a viewing window.

(3) By using a solenoid and assembling the control circuit, electrical control becomes possible, and the display of the current rated voltage and the display of the tap position are automatically performed with the switching of the control switch. Can be switched.

(4) When using a solenoid, 77k
There is no problem in the case of V, but in the case of 22 kV and 33 kV, the tap position and the rated voltage are displayed in the solenoid-excited state. In this case, when the control power is OFF, the tap position display is 77 kV even though the transformer is in the 22 kV or 33 kV state. Therefore, a structure in which the slide shutter is manually displayed is also possible.

[Brief description of the drawings]

FIG. 1 is a relationship diagram showing a connection between a connection and a tap position of a load tap switching device with a sub-switch of 35 taps and a no-voltage series-parallel switch of a 3-rated voltage switching transformer of the present invention.

FIG. 2 is a front view of a tap position display plate according to the first embodiment of the tap position display device of the present invention.

FIG. 3 is an exploded explanatory view of a slide shutter in the tap position display device of the present invention.

FIG. 4 is a front view showing a state of a slide shutter during a rated voltage of 77 kV operation in the tap position display device of the present invention.

FIG. 5 is a front view showing a state of a slide shutter during a rated voltage of 33 kV operation in the tap position display device of the present invention.

FIG. 6 is a front view showing a state of a slide shutter during a rated voltage 22 kV operation in the tap position display device of the present invention.

FIG. 7 is a front view of the tap position display device of the present invention with a slide shutter attached.

FIG. 8 is a top view for explaining the operation of the solenoid of the tap position display device provided with the slide shutter in the tap position display device of the present invention.

FIG. 9 shows a rated voltage 7 of the tap position display device with a slide shutter attached in the tap position display device of the present invention.
The front view showing the state at the time of 7kV operation.

FIG. 10 is a front view showing a state in which the tap position display device of the present invention with the slide shutter mounted thereon is operated at a rated voltage of 33 kV.

FIG. 11 is a front view of the tap position display device according to the present invention in a state where the tap position display device to which the slide shutter is attached is operated at a rated voltage of 22 kV.

FIG. 12 is a circuit diagram of a control circuit of the tap position display device in the tap position display device of the present invention.

FIG. 13 is a configuration diagram of a tap position display device of a conventional electric operation mechanism of a load tap switching device.

FIG. 14 is a front view of a tap position indicating plate of a tap position display device of an electric operation mechanism of a conventional load tap change device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tap position display board 2 ... Surface plate 3 ... Display window 4 ... Slide shutter 5 ... Front slide shutter 6 ... Rear slide shutter 7 ... Viewing window 8 ... Viewing window 9 ... Viewing window 10 ... Viewing window 11 ... Viewing window 12 ... front solenoid 13 ... rear solenoid 14 ... front spring 15 ... rear spring 16 ... selector switch 17 ... selector switch terminal 18 ... selector switch terminal 19 ... selector switch terminal 20 ... selector switch terminal 21 ... relay 22 ... relay 23 ... contact 24 ... Contact

Claims (4)

[Claims] 1. A tap position display device provided in an electric operating mechanism of a tap changer under load of a transformer, wherein a full-scale scale is provided on an outermost periphery and a tap position display during operation at a second rated voltage is provided inside the scale. The scale is further provided with a tap position display scale at the time of operation at the third rated voltage on the inner side thereof, and the first innermost circumference is provided with the first scale.
The tap position display scale at the time of operation at the rated voltage is written on the disk-shaped tap position display plate, and the tap position at each rated voltage is displayed to enable the tap position display corresponding to 3 rated voltages. A tap position display device characterized in that: 2. A front slide shutter is disposed in front of a front slide shutter and a rear slide shutter is disposed behind and mounted on a front plate having a display window.
Of the rated voltage and two viewing windows are provided. The rear sliding shutter is provided with a first rated voltage and a third rated voltage and three viewing windows. A tap position display plate is arranged on the rear side, and the operation of the slide shutter allows the rated voltage and tap position number during operation to be visible from the display window on the front plate, enabling tap position display corresponding to the rated voltage used. The tap position display device according to claim 1, further comprising a slide shutter. 3. A front and rear slide shutter is mounted on a surface plate having a display window in front of a tap position display plate, and the slide shutter is mounted on a slidable rail to switch a rated voltage. 3. The tap position display device according to claim 2, further comprising a slide shutter in which the positions of the front slide shutter and the rear slide shutter can be switched by manual operation. 4. A solenoid for electrically controlling one end of each of the two slide shutters,
A spring is attached to the other end of each slide shutter, and each slide shutter can be moved by exciting each solenoid, and when it is not excited, it returns to the original position by the spring. 4. The tap position display device according to claim 2, wherein the tap position display is automatically switched by a three-circuit selector switch in accordance with the switching.