JP3077878B2 - Transformer replacement bypass switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bypass switch for replacing a transformer, and more particularly, to a bypass switch for replacing a transformer which enables replacement of a transformer for an instrument or the like without a power failure on a secondary side. .

[0002]

2. Description of the Related Art Meter transformers installed for measuring the electric power used by high-voltage consumers are required to be 15 meters in accordance with the measurement law.
It must be revoked every year. Conventionally, this replacement work is performed after the power transmission to the main circuit is stopped, and during that time, the power is cut off on the customer side.

[0003]

If a power failure occurs during the replacement work as described above, the customer may be inconvenient, for example, the operation may be interrupted. Therefore, conventionally, replacement work is often requested on holidays such as Saturday and Sunday. However, if the replacement work is concentrated on a holiday, the workers involved in the replacement work will be forced to go to work on the holiday, which causes a problem that the working environment is deteriorated. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a transformer exchange bypass switchgear capable of safely and safely replacing an instrument transformer without power interruption. Is to do.

[0004]

In order to achieve the above-mentioned object, the present invention provides a case supported above a transformer to be replaced and input / output devices provided on both sides of the case.
A set of main circuit side bushings, one set of input and output transformer side bushings respectively arranged on the bottom of the case corresponding to the main circuit side bushings, and linked to the turning operation of the handle installed outside the case A main circuit opening / closing mechanism for opening / closing between fixed conductors supported by opposing main circuit side bushings in the case, and vertically slidably supported by the transformer side bushing, and positioned downward when descending. The movable conductor on the transformer side, which comes into contact with the terminals of the transformer and separates when ascending, moves between the fixed conductor on the bushing on the main circuit side and the movable conductor on the transformer side, which correspond to each other in conjunction with the main circuit opening / closing mechanism. A transformer-side opening / closing mechanism that opens and closes so as to be closed when the main circuits are opened, and an elevating mechanism that raises the transformer-side movable conductor when the main circuits are closed in conjunction with the main circuit opening / closing mechanism. It is characterized by having.

[0005]

In the present invention, when the handle is turned to close the main circuit opening / closing mechanism, the main circuits are closed to form a bypass circuit. At the same time, the transformer opening / closing mechanism is linked to open the corresponding fixed conductor of the main circuit side bushing and the movable conductor on the transformer side. Further, at this time, the movable conductor on the transformer rises in conjunction with the elevating mechanism, and is separated from the terminal of the transformer. In this state, remove the old transformer and replace it with a new one.

Next, when the handle is rotated to the original position to open the main circuit opening / closing mechanism, before the main circuits are opened, the elevating mechanism operates and the transformer-side movable conductor is opened. Descends and contacts the terminals of the transformer. At the same time, the transformer opening / closing mechanism operates to close between the fixed conductor of the main circuit side bushing and the transformer side movable conductor. Thereafter, the main circuits are opened to return to the original state, and the exchange of the transformer is completed. By forming the bypass circuit of the transformer at the time of replacing the transformer in this way, the transformer can be replaced while the live line remains, and the secondary side does not lose power.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of an embodiment of a transformer replacement bypass switch according to the present invention, and FIG. 2 is a sectional view showing an internal structure of a main part of FIG. In FIG. 1, reference numeral 1 denotes a housing, and a case 2 is supported on an upper inside. A replaceable transformer 3 is provided below the case 2.

[0008] Tulip contacts 4 and 5 are formed on the upper part of the transformer 3, and movable conductors 6 and 7 are fitted to the contacts 4 and 5 so as to be freely inserted and removed. Movable conductor 6,
7 is supported by a bushing 8, 9 on the transformer side disposed on the bottom surface of the case 2 so as to be vertically movable. An operation handle 11 is provided on the front surface of the hand of the case 2, and is usually fixed by a holding plate 12. Main circuit side bushings 13 and 14 are respectively disposed on both side surfaces of the case 2, and insulated wires 15 and 16 are connected thereto.

Next, the inside of the case 2 will be described in detail with reference to FIG. The bushings 13, 14 are arranged coaxially with each other and support the fixed conductors 17, 18, respectively. A movable conductor 21 having a movable electrode 19 at the tip is pivotally supported by a pin 22 at the inner end of the fixed conductor 17. The movable conductor 21 is connected in the middle by a bent link 23 and a pin 24. When the bent link 23 moves downward, the movable conductor 21 rotates counterclockwise, and the movable electrode 19 is sandwiched by the fixed conductor 18. Wear the fixed conductor 17,1
8 is closed.

[0010] The movable conductors 6, 7 which are slidably fitted to the bushings 8, 9 on the transformer side located on the bottom surface of the case 2 are provided with movable electrodes 25, 2 at their upper ends.
The movable conductors 27 and 28 set to 6 are connected by pins 31 and 32. The movable conductors 27 and 28 are
3 and 34, and are connected to output links 37 and 38 via pins 35 and 36. The movable conductors 27 and 28 rotate according to the movement of the output links 37 and 38, and move. Electrodes 25 and 26 are clamped or separated from the tips of fixed conductors 17 and 18.

The other ends of the output links 37 and 38 are connected to the bent link 23 by pins 39. The lower end of the bending link 23 is connected to a lever 42 by a pin 41, and the other end of the lever 42 is connected to a rotation shaft 43 of the operation handle 11.
It is fixed to. The lever 42, the pin 41, the bent link 23, the pin 24, the movable conductor 21, the pin 22, the movable electrode 19, and the like constitute an inter-main-circuit opening / closing mechanism.
Further, a transformer side opening / closing mechanism and a lifting / lowering mechanism are constituted by the movable electrodes 25 and 26, the movable conductors 27 and 28, the pins 31 and 32, the support shafts 33 and 34, the pins 35 and 36, the output tanks 37 and 38, the pins 39, and the like. Is done. The links 23 and 3
7, 38 are formed of an insulator. Although FIG. 2 shows only one-phase circuits,
These circuits are stacked in two or three phases in the thickness direction of the paper.

Next, the operation will be described. Normally, the movable conductors 21, 27, and 28 are held in the illustrated state, and the transformer 3 is connected to the main circuit. Here, when the transformer 3 is to be replaced, the pressing plate 12
Is removed and the operation handle 11 is rotated clockwise. Then, the lever 42 is simultaneously rotated clockwise, and the bending link 23 is pulled down. As a result, the movable conductor 21 that has been open is rotated counterclockwise, and the movable electrode 19 clamps the fixed conductor 18. As a result, the fixed conductors 17 and 18 are closed to form a bypass circuit.

Next, the output links 37 and 38 are also pulled down, and the movable conductors 27 and 28 are turned inward and downward. As a result, the movable electrodes 25 and 26 which have sandwiched the ends of the fixed conductors 17 and 18 have been extracted, and the transformer 3 is separated and insulated from the main circuit, so that there is no voltage. At the same time, the other ends of the movable conductors 27 and 28 are raised, whereby the movable conductors 6 and 7 are pulled up, and the lower ends thereof are extracted from the contacts 4 and 5. In this state, the transformer 3 is pulled out and replaced.

Next, after the new transformer 3 is placed at a predetermined position below the case 2, when the operating handle 11 is turned counterclockwise, the movable conductors 6, 7 descend in the reverse order, The lower end is fitted to the contacts 4 and 5. at the same time,
The movable electrodes 25 and 26 at the tips of the movable conductors 27 and 28 are clamped between the tips of the fixed conductors 17 and 18. Further, the movable electrode 19 at the tip of the movable conductor 21 is pulled out from the fixed conductor 18, the gap between the fixed conductors 17 and 18 is opened, and the original state is restored. Further, after returning the operation handle 11 to the original position, the operation handle 11 is fixed by the holding plate 12, and the replacement operation is completed.

As described above, in this embodiment, the connection and disconnection of the transformer 3 can be performed with only a simple operation of the operation handle 11 without power failure on the secondary side, and the replacement work can be performed according to the convenience of the operator. Be able to plan. In addition,
Although the embodiment has been described in the case where the transformer is replaced, the present invention is also applicable to the case where the other electrical equipment is replaced with a hot-line by forming a bypass circuit.

[0016]

As described above, according to the present invention, when the handle is rotated, a bypass circuit for the transformer is formed and the transformer is insulated from the main circuit. The transformer can be replaced in a short time without power failure on the secondary side. as a result,
Transformers can be replaced on weekdays without disturbing consumers due to power outages, and the working environment for workers is improved.

[Brief description of the drawings]

FIG. 1 is an external view of an embodiment according to the present invention.

FIG. 2 is a sectional view showing a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Case 3 Transformer 4,5 Tulip contact 6,7 Movable conductor 8,9 Transformer side bushing 11 Operation handle 12 Holding plate 13,14 Main circuit side bushing 15,16 Insulated wire 17,18 Fixed conductor 19 Movable Electrode 21 Movable conductor 22 Pin 23 Bending link 24 Pin 25,26 Movable electrode 27,28 Movable conductor 31,32 Pin 33,34 Support shaft 35,36 Pin 37,38 Output link 39,41 Pin 42 Lever 43 Rotating shaft

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Seiichi Nakata 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Tokyo Electric Power Company (56) References JP-A 7-308035 (JP, A) -120727 (JP, U) Jikken 46-32512 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 21/18 H01H 33/42-33/58

Claims (1)

(57) [Claims] 1. A case supported above a transformer to be replaced, a pair of main circuit-side bushings arranged on both sides of the case, and a case bottom corresponding to the main circuit-side bushing. In conjunction with the transformer bushing, one set each for input and output, respectively, and the turning operation of the handle installed outside the case,
A main circuit opening / closing mechanism that opens and closes between fixed conductors supported by the opposing main circuit bushings in the case; and a transformer that is vertically slidably supported by the transformer side bushings and that is positioned below when descending. The main conductor between the fixed conductor of the bushing on the main circuit side and the movable conductor on the transformer side that correspond to each other, A transformer-side opening / closing mechanism that opens and closes so as to be closed when the main circuit is opened, and an elevating mechanism that raises the transformer-side movable conductor when the main circuits are closed in conjunction with the main circuit opening / closing mechanism. A bypass switch for transformer replacement, characterized in that: