JP2736686B2 - Mounting method and mounting structure of high voltage shield of transformer - Google Patents

Description

The present invention relates to a mounting method and a mounting structure for mounting a high-voltage shield outside a high-voltage winding of a transformer.
The present invention relates to a technique for mounting a high-voltage shield that is mounted so as to cover a coil of a gas-insulated instrument transformer in order to alleviate an electric field of a high-voltage winding (coil) in the transformer.

[Prior Art] As shown in FIG. 9 and FIG. 10, an example of a conventional gas-insulated meter transformer (hereinafter sometimes referred to as gas PT) is shown.
Is a low pressure coil from the inside to the outside of the iron core 1,
It has a structure in which a coil 2 composed of a high-voltage coil is wound, and a high-voltage shield 3 is mounted on the outer periphery of the high-voltage coil. In these figures, reference numeral 4 denotes a ground (earth) shield, which is provided to alleviate the electric field at the corners of the iron core 1. In these figures, reference numeral 5 denotes a frame. The gas PT 6 assembled using the frame 5 and provided with the iron core 1, the coil 2 and the high-pressure shield 3, although not shown, is a sealed switchgear (GIS) in which a high-pressure insulating gas such as SF ₆ is sealed. Although not shown, it is connected to the outside and functions as a gas PT.

As the mounting posture of the gas PT on the GIS, various mounting postures such as upright, horizontal, and inverted are adopted depending on the installation conditions in order to save the entire GIS.

An example of a patent describing gas PT is
No. 2367, No. 61-14261, Japanese Unexamined Patent Publication No. 61-201409,
Japanese Utility Model Application Laid-open No. Sho 60-123609, JP-A No. 61-135107, and 61-1373
No. 09 and 61-117815.

[Problems to be Solved by the Invention] The high-voltage shield of the high-voltage coil is used for the purpose of relaxing the electric field of the coil. It must be kept to a minimum, otherwise it will be strongly affected by the electric field.

Attention must be paid to the installation of the high-pressure shield, and in general, the installation is difficult and requires a special jig for the installation.

On the other hand, in the high-pressure shield, it is necessary to prevent the position of the gas PT from shifting due to an external force such as vibration during transportation depending on the mounting posture of the gas PT.

 Therefore, it is necessary to firmly mount the high-voltage coil.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique for attaching a high-voltage shield, which requires less influence of an electric field and enables easy and firm attachment.

Means for Solving the Problems The present invention provides a seat plate having a mounting seat having a groove on a high-voltage winding when a high-voltage shield divided into two parts is mounted outside a high-voltage winding in a transformer. Is fixed, a mounting member capable of pressing and fixing the end of the high-pressure shield is mounted on the mounting seat, and the holding member is temporarily fixed to the seat plate with a fastening part such as a screw, and after positioning the high-pressure shield, Rotating the presser from the outside of the high-voltage shield, fitting it into the groove of the mounting seat, pressing and fixing the end of the high-pressure shield by the presser, and mounting the high-pressure shield outside the high-voltage winding. A method of mounting a high-voltage shield of a transformer, and a seat plate provided with a mounting seat having a groove on the outside of the high-voltage winding of the transformer, and a holding bracket for the high-pressure shield is attached to the mounting seat of the seat plate. Into the groove of In the transformer, the high-voltage shield is mounted outside the high-voltage winding.

[Operation] The operation according to the present invention will be described together with a preferred embodiment. In mounting the high-voltage shield divided into two parts, a seat plate provided with a bolt seat having a groove on the outer periphery of the coil is fixed to the bolt seat. Place the presser fitting that can press and fix the end of the shield, lightly screw (temporarily), set the high-pressure shield to the specified position,
A screwdriver or the like is inserted through a screw tightening hole formed in the high-pressure shield, and the presser fitting is rotated by a screwdriver or the like so as to enter the groove of the bolt seat, and the screw is tightened.

As a result, the holding member does not enter the groove of the bolt seat and does not shift. Therefore, the high-pressure shield pressed by the holding member is firmly fixed, and its position is prevented from being displaced even when an external force such as vibration is applied. Further, at the time of the above mounting, a hole (notch) enough to allow a screwdriver for rotating the presser fitting may be provided, and the effect of the electric field due to the mounting notch in the high-pressure shield can be reduced.

As described above, when the high-voltage shield is mounted, the above-described mounting method is adopted, and the shield can be easily mounted by a simple operation of one driver from the outside of the shield, so that the mounting work is likely to be complicated. The work of installing the high-pressure shield can be simplified.

As described above, according to the present invention, not only the mounting operation is facilitated, but also the high-pressure shield is pressed and fixed to the coil through the seat plate by the holding jig, and the holding jig is inserted into the groove of the seat of the seat plate. Since the mounting structure is fitted so as not to shift, the high-pressure shield is firmly mounted, the influence of the electric field is small, and a highly reliable high-pressure shield mounting structure can be provided.

Example Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory view showing an embodiment of the present invention, and shows a state before a high-pressure shield is attached. FIG. 2 is an explanatory diagram by a perspective view after the high-pressure shield is attached.

As shown in FIG. 1, a seat plate with a bolt seat (hereinafter simply referred to as a seat plate) 8 provided with a bolt seat 7 is fixed to the outer periphery of the coil (high-voltage coil) 2. The seat plate 8 is made of, for example, a stainless steel strip, and in this embodiment, four bolt seats 7 are erected at substantially equal intervals.

As shown in FIG. 1, both ends of the seat plate 8
And fixed to the outer periphery of the high voltage coil 2.

FIG. 3 is a three-dimensional view showing a main part of the present invention, in which each constituent member before fixing of the presser fitting with screws is exploded.

3, the bolt seat 7 attached to the seat plate 8 has a U-shaped cross section and has a groove 10 as shown in FIG. At the center of the groove 10, a screw hole 11 for a fastening component such as a screw described later is provided.

A holding member 12 having a U-shaped cross section as shown in FIG. 3 is placed on the bolt seat 7. A screw hole 14 into which a screw 13 is inserted as shown in FIG.

The presser fitting 12 is lightly screwed (temporarily fixed) on the bolt seat 7 with the screw 13 in a direction perpendicular to the groove 10 of the bolt seat 7.

 FIG. 4 is a plan view for explaining the temporary fixing state.

After the temporary fixing, the high-pressure shield 3 is set at a specified position.

FIG. 5 shows a sectional view of the high-pressure shield 3 before setting. FIG. 8 shows a sectional view after the setting.

The high-pressure shield 3 is divided into two parts in the radial direction to prevent a short-circuit for one turn.

FIG. 6 shows a perspective view of one of the divided high-voltage shields 3A.

As shown in FIG. 2, the divided high-pressure shields 3A and 3B are fastened by interposing a spacer 15 or the like in the divided portion.

After the high-pressure shield 3 is set at the specified position, the screw fastening holes 30 provided in the high-pressure shield 3 (3A) are set.
From 0, insert a screwdriver, etc.
As illustrated in the arrowhead of FIG. 4, the bolt is rotated and fitted into the groove 10 of the bolt seat 7 as shown in FIG. When the screw 13 is tightened, as shown in FIG. 8, both bottoms (both ends) 30 of the high-pressure shield 3 (3A) are pressed by both ends of the holding metal 12, so that the high-pressure shield 3 (3A) Is high voltage coil 2
Is fixed to the outer periphery of.

By making the width of the holding member 12 substantially equal to the width of the groove 10 of the bolt seat 7, the holding member 12 does not shift in the groove 10 of the bolt seat 7. Accordingly, the gas PT is firmly fixed, and is prevented from vibrating or shifting due to the mounting posture of the gas PT or an external force during transportation.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a mounting technique capable of firmly fixing the high-voltage shield by a simple mounting method with little influence on an electric field when mounting the high-voltage shield.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of the present invention before mounting a high-voltage shield, FIG. 2 is an explanatory view showing the state after the high-pressure shield is mounted, FIG. FIG. 5 is a plan view illustrating a temporary fixing state before the rotation of the bracket, FIG. 5 is a cross-sectional view before setting the high-voltage shield, FIG. 6 is a perspective view of the high-pressure shield, FIG. FIG. 8 is a cross-sectional view after mounting the high-pressure shield, FIG. 9 is a front view of the gas PT,
FIG. 10 is a side view of the gas PT. DESCRIPTION OF SYMBOLS 1 ... Iron core 2 ... Coil 3 ... High voltage shield 4 ... Grounding (earth) shield 5 ... Frame 6 ... Gas PT 7 ... Bolt seat 8 ... Seat plate 9 ... Fixture 10 ... Groove 11 Screw hole 12 Screw 13 Screw 14 Screw hole 30 High pressure shield bottom (end) 300 Screw hole

Claims (2)

(57) [Claims] When a high-voltage shield divided into two parts is mounted outside a high-voltage winding in a transformer, a seat plate provided with a mounting seat having a groove is fixed to the high-voltage winding, and the mounting plate is fixed to the mounting seat. A presser fitting capable of pressing and fixing the end of the high-pressure shield is placed, and the presser fitting is temporarily fixed to the seat plate with a fastening part such as a screw, and after the high-pressure shield is positioned, the presser fitting is externally connected to the high-pressure shield. From the high pressure shield of the transformer, wherein the high pressure shield is attached to the outside of the high voltage winding by fixing the end of the high voltage shield by pressing the end of the high pressure shield with the holding metal. Mounting method. 2. A holding plate having a mounting seat having a groove fixed to the outside of a high-voltage winding of a transformer, and a holding member capable of pressing and fixing an end of a high-pressure shield is attached to the mounting plate. A high-voltage shield mounting structure for a transformer, wherein the high-voltage shield is mounted outside the high-voltage winding by being fitted into a groove of a seat.