JP2010080470A - Automatic voltage regulator for power distribution - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an existing automatic voltage regulator for power distribution in which a protective cover is easily attached to a tap position inspection window even for a field assembled article. <P>SOLUTION: In the automatic voltage regulator for power distribution in which the tap position inspection window is provided on a side surface of a case so as to confirm a tap position from outside the case, protective cover metal fittings are clamped and fixed to an outer periphery of a window fitting seat with a Jubilee band, and the protective cover metal fittings comprise ring-shaped metal fittings having a cut partially in a peripheral direction, a bolt fitting seat fitted opposite an upper end of the ring-shaped metal fittings, and a protective cover support bolt fixed to the bolt fitting seat. The protective cover is provided in a turnable manner along a flat surface of a transparent member to make a choice between a position where the tap position inspection window is covered while the protective cover is supported with the protective cover support bolt and a position where the tap position inspection window is not covered. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an automatic voltage regulator for power distribution provided with a tap position viewing window with a protective plate.

  As shown in Patent Document 1, the automatic voltage regulator for power distribution includes a tap transformer, a load tap changer for performing tap switching of the tap transformer, and a tap position in conjunction with the load tap changer. It is equipped with a tap position indicator plate that displays mechanically, and is housed in the case in a state filled with insulating oil together with the filled insulating oil. During operation of the automatic voltage regulator for power distribution and inspection, At this time, a tap position viewing window is provided on the side of the case so that the tap position can be confirmed outside the case.

  As shown in FIGS. 5A and 5B, the conventional tap position viewing window 1 of the automatic voltage regulator for power distribution includes a window frame mounting seat 2, a transparent member 3, a window frame 4, and packings 5a and 5b. . The window frame mounting seat 2 is formed by forming a metal plate having a relatively large thickness into a circular ring shape, and a circular notch formed on the side surface of the case 6 with one circular flat surface facing the case 6. A plurality of window frame mounting tap holes 7 are formed at predetermined intervals in the circumferential direction on the other flat surface of the circle. The transparent member 3 is formed of an acrylic plate or the like in a circular shape, the window frame 4 is formed of a metal plate or the like in a circular ring shape, and the packings 5a and 5b are formed in a circular shape. Bolt through holes 8 are respectively formed corresponding to the window frame attaching tap holes 7 formed in the seat 2. The window frame 4 has a packing 5a, a transparent member 3, and a packing 5b sequentially interposed in the window frame mounting seat 2, and a bolt 9 is inserted into a bolt through hole 8 formed in the window frame 4 so as to be a window frame mounting tap. It is attached by screwing into the hole 7 and tightening.

  In recent years, accidents in which the transparent member 3 of the tap position viewing window 1 is cracked by flying objects, and the insulating oil filled in the case is activated by heat or light, causing hydrocarbons to be activated and oxidation to proceed. There is an increasing need to attach protective covers to windows.

As shown in FIGS. 6 (A) and 6 (B), the conventional tap position viewing window 1 with a protective cover is constructed by erecting two protective cover supporting bolts 10a and 10b on the flat surface of the window frame 4 by welding or the like. The protective cover 12 having bolt through holes 11a and 11b formed so as to correspond to the two protective cover supporting bolts 10a and 10b is inserted into the protective cover supporting bolts 10a and 10b, and the wing nuts 12a and 12b respectively. It is configured to be tightened and attached so as to cover the entire window frame 4 or any two bolts 9 among a plurality of bolts 9 tightening the tap position viewing window 1 are removed, and the bolts 9 are removed. Protective cover supporting bolts 10a and 10b are respectively screwed into the rear two window frame mounting tap holes 7 for mounting, and two protective cover supporting bolts are attached. The protective cover 12 having bolt through holes 11a and 11b formed corresponding to 0a and 10b is inserted into the protective cover supporting bolts 10a and 10b and tightened by the wing nuts 12a and 12b to cover the entire window frame 4. It was configured to be attached to.
JP 2006-179680 A (FIG. 14)

  However, when the conventional tap position observation window 1 with a protective cover is applied to an existing automatic voltage regulator for power distribution, welding work on the site and on a power pole is required, which is very complicated. Further, when the conventional tap position viewing window 1 with a protective cover is applied to an existing and newly manufactured automatic voltage regulator for power distribution, when the protective cover 12 is removed and the inside of the transparent member 3 is to be looked into, The two wing nuts 12a and 12b are completely removed from the protective cover supporting bolts 10a and 10b, respectively, and the protective cover 12 must be removed from the protective cover supporting bolts 10a and 10b. And take time. In addition, the work is performed on the utility pole, and there is a possibility that the protective cover 12 and the wing nuts 12a and 12b are dropped. Further, when the protective cover 12 is attached to the existing field pillars, since the work for removing any two bolts 9 is accompanied by the filling of the insulating oil, the oil is removed when the bolts 9 are removed. There is a concern that leakage will occur.

  An object of the present invention is to provide an existing power distribution system that allows a protective cover to be easily attached to a tap position viewing window even for existing field pillars without removing the bolts tightening the tap position viewing window. It is to provide an automatic voltage regulator.

    A first invention includes a transformer body with a tap, a tap changer at the time of performing tap switching of the transformer body with a tap, and a tap that mechanically displays a tap position in conjunction with the tap changer at the time of load. The position indicator plate is housed in the case filled with insulating oil, and a tap position viewing window is provided on the side of the case so that the tap position can be confirmed from the outside of the case. The automatic voltage regulator for power distribution mounted by tightening the transparent member, packing, and window frame sequentially on the window frame mounting seat attached to the periphery of the notch formed on the side of the door and tightening with bolts A protective cover fixing bracket is fastened and fixed to the outer periphery of the window frame mounting seat by a Jubilee band. The protective cover fixing bracket is a ring-shaped bracket having a cut part in the circumferential direction. It consists of a bolt mounting seat attached facing the upper end of the ring-shaped bracket and a protective cover support bolt fixed to the bolt mounting seat. The tap position viewing window is supported by the protective cover support bolt. A protective cover that is rotatable along the flat surface of the transparent member is provided so that a covering position and a position not covering the tap position viewing window can be selected.

  According to a second aspect of the present invention, a bolt through hole is formed corresponding to one of the two protective cover supporting bolts attached to the protective cover fixing bracket, and the shaft of the protective cover supporting bolt inserted through the bolt through hole. Protective covers formed with arc-shaped cuts that can be rotated around and locked with the other of the two protective cover support bolts to prevent natural fall, and the nuts to the protective cover support bolts, respectively. It can be attached by screwing and tightening.

  As described above, according to the first aspect of the present invention, there is no welding operation for the existing automatic voltage regulator for power distribution, and no tap position inspection is performed without removing the bolts tightening the tap position inspection window. A protective cover can be attached to the window, the work of providing the protective cover on the conventional tap position viewing window can be greatly simplified, and there is no concern about the occurrence of oil leakage. . Furthermore, the installation and removal of the protective cover can be greatly simplified for existing and new automatic voltage regulators for power distribution with a tap position viewing window with a protective cover, and the protective cover and nut can be dropped. Can be prevented

  According to the second invention, in addition to the effects of the first invention, in particular, the tap position observation window is easily modified with respect to the existing automatic voltage regulator for power distribution provided with the conventional tap position observation window. Can be made.

    1A is a front view showing a main part of an embodiment of an automatic voltage regulator for distribution according to the present invention, FIG. 1B is a cross-sectional view taken along the line A-A in FIG. FIG. 3 is a front view showing a main part of an embodiment of the automatic voltage regulator for power distribution according to the present invention, and FIG. 4A is a protection cover fixing used in this embodiment. The front view which shows a metal fitting, (B) is a left view of (A), (C) is a lower side view of (A).

  The basic structure of the tap position viewing window 1 with the protective cover shown in FIG. 1 is the same as that of the tap position viewing window 1 shown in FIG. 5, and includes a window frame mounting seat 22, a transparent member 23, a window frame 24, a packing 25a, 25b. The window frame mounting seat 22 is attached to the circumferential circle of the notch 6a formed on the side surface of the case 6 by welding, and a plurality of window frame mounting tap holes 27 are formed. Bolt through holes 28 are formed in the window frame 24 so as to correspond to the window frame mounting tap holes 27 formed in the window frame mounting seat 22. The window frame 24 is attached by inserting bolts 29 through the bolt through holes 28, screwing them into the window frame attaching tap holes 27, and tightening.

  As shown in FIG. 3, a protective cover fixing bracket 30 is fastened and fixed to the outer periphery of the window frame mounting seat 22 by a jubilee band 31. As shown in FIGS. 4A, 4B, and 4C, the protective cover fixing metal fitting 30 is opposed to a ring-shaped metal fitting 33 having a cut portion 32 in a circumferential direction and an upper end portion of the ring-shaped metal fitting 33 by welding. L-shaped bolt mounting seats 34a and 34b and protective cover supporting bolts 35a and 35b mounted on the upper end surfaces of the bolt mounting seats 34a and 34b. The heads of the bolts with heads are attached to the upper end surfaces of the bolt mounting seats 34a and 34b by welding. A notch 36 for draining water is formed on the lower end side of the ring-shaped metal fitting 33 where the bolt mounting seat 34a is located. A bolt through hole 37a is formed corresponding to the two protective cover support bolts 35a and 35b attached to face the upper end of the ring-shaped metal fitting 33, and the protective cover support is inserted through the bolt through hole 37a. A protective cover 37 formed with arc-shaped cuts 37b that can be rotated around the axes of the bolts 35a and 35b and locked by the protective cover supporting bolts 35a and 35b so as to prevent natural fall is provided. The bolts are inserted into the supporting bolts 35a and 35b and fastened by wing nuts 38a and 38b, respectively.

  As shown in FIG. 1, the protective cover 37 is engaged with the protective cover supporting bolt 35b at a position that covers the window frame 24 (transparent member 23) of the tap position viewing window 1 when not operated or not inspected. Although it is stopped, it can be turned by loosening the tightening of the wing nuts 38a and 38b at the time of operation and inspection. Therefore, the protective cover 37 is rotated counterclockwise and the window frame 24 ( The wing nut 38a is tightened at the position shown in FIG. 2 that does not cover the transparent member 23).

  As a procedure for attaching the protective cover 37 to the tap position viewing window 1 for the existing and new automatic voltage regulators for power distribution, first, the lower end surfaces of the bolt mounting seats 34a and 34b are brought into contact with the upper end surface of the window frame 24, respectively. At the same time, the protective cover fixing bracket 30 is fitted on the outer periphery of the window frame mounting seat 22 so that the notch 36 formed in the ring-shaped bracket 33 is on the lower side, and then the jubilee band 31 is attached to the protective cover fixing bracket 30. The protective cover fixing bracket 30 is fixed to the outer periphery of the window frame mounting seat 22 by tightening the jubilee band 31 with a screwdriver or the like, and then the through hole 37a formed in the protective cover 37 is connected to the protective cover supporting bolt 35a. The notch 37b is inserted into the protective cover supporting bolt 35b, and the wing nuts 38a, 3 are inserted into the protective cover supporting bolts 35a, 35b. b was a screwed respectively attached by tightening things.

  As in the present embodiment, when the protective cover fixing bracket 30 is attached so that the drainage notch 36 formed in the ring-shaped bracket 33 is on the lower side, the window frame mounting seat 22 and the ring It is possible to prevent rainwater that has entered between the metal fittings 33 and to prevent the mechanical strength of the protective cover fixing metal fitting 30 from being lowered due to rusting. Further, if the protective cover 37 is attached so that the notches 37b formed in the protective cover 37 are on the upper side, the wing nuts 38a and 38b are loosened during operation and inspection. If the protective cover 37 is slightly rotated counterclockwise, it can be suspended by its own weight, and it is not necessary to retighten the wing nut 38a at a position where the window frame 24 (transparent member 23) is not covered. The work at the time of inspection can be easily performed.

  In the above embodiment, the head of a normal headed bolt is attached to the upper end surface of the bolt mounting seat as a protective cover supporting bolt by welding, but a headless stud bolt is attached to the upper end surface of the mounting seat 34. May be.

(A) is a front view which shows the principal part of embodiment of the automatic voltage regulator for power distribution concerning this invention, (B) is the sectional view on the AA line of (A). It is a front view which shows the state which rotated the protective cover of FIG. It is a top view which shows the principal part of embodiment of the automatic voltage regulator for power distribution concerning this invention. (A) is a front view which shows the protective cover fixing metal fitting used by this embodiment, (B) is a left view of (A), (C) is a lower side view of (A). (A) is a front view which shows the principal part of the automatic voltage regulator for power distribution which has the conventional tap position observation window, (B) is an AA sectional view taken on the line in FIG. (A) is a front view which shows the principal part of the automatic voltage regulator for power distribution which has a tap position observation window with the conventional protective cover, (B) is an AA sectional view taken on the line in FIG.

Explanation of symbols

1 Tap position viewing window 6 Case 6a Notch 22 Window frame mounting seat 23 Transparent member 24 Window frame 27 Window frame mounting tap hole 28 Bolt through hole 29 Bolt 30 Protective cover fixing bracket 31 Jubilee band 33 Ring-shaped brackets 34a, 34b Bolt Mounting seat 35a, 35b Protective cover support bolt 37 Protective cover 38a, 38b Wing nut

Claims (2)

Insulation between the transformer body with tap, the tap changer for loading that performs tap switching of the transformer body with tap, and the tap position display plate that mechanically displays the tap position in conjunction with the tap changer during load The tap position inspection window is provided on the side of the case so that the tap position can be confirmed from the outside of the case, and the tap position inspection window is provided on the side of the case. In the automatic voltage regulator for power distribution installed by sequentially interposing the transparent member, packing and window frame on the window frame mounting seat attached to the periphery of the formed notch, and tightening with bolts,
A protective cover fixing bracket is fastened and fixed to the outer periphery of the window frame mounting seat by a jubilee band. The protective cover fixing bracket is a ring-shaped bracket having a cut portion in a circumferential direction and an upper end of the ring-shaped bracket. A position for covering the tap position viewing window in a state of being supported by the protection cover support bolt, and a bolt cover for mounting the cover, and a protection cover support bolt fixed to the bolt mount seat. An automatic voltage regulator for power distribution, comprising a protective cover that is rotatable along the flat surface of the transparent member so that a position that does not cover the tap position viewing window can be selected. A bolt through hole is formed corresponding to one of the two protective cover support bolts attached to the protective cover fixing bracket, and rotates around the axis of the protective cover support bolt inserted into the bolt through hole. A protective cover formed with an arc-shaped notch that is locked with the other of the two protective cover support bolts so as to prevent natural fall, and screwing the nut to the protective cover support bolt respectively. 2. The automatic voltage regulator for power distribution according to claim 1, wherein the automatic voltage regulator is attached by tightening.

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