JPH0727782Y2 - Shield device for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a shield for an electric device which is provided at a connecting portion between a fixed-side conductor and a movable-side conductor of an electric device and reduces or improves an electric field at this connecting portion. Regarding the device.

[Conventional technology]

Generally, in an electric device having a connecting portion between a fixed-side conductor and a movable-side conductor, a shield device is provided by covering the connecting portion in order to alleviate and improve an electric field.

For example, as shown in FIGS. 2 (a) and 2 (b), devices such as a circuit breaker, a disconnector, and a current transformer are housed in a metal container, and SF ₆
2. Description of the Related Art In a gas-insulated switchgear (hereinafter referred to as GIS) in which a gas is enclosed, a shield device is provided at a connection part (W) surrounded by a circle in FIG.

By the way, in FIGS. 2A and 2B, (1) is a metal container, (2) is an electric spring operating device for line side disconnecting switch,
(3) is an electric spring operation device for the line side grounding switch, (4)
Is a gas monitoring box, (5) is a manual spring operating device for the bus-side disconnector, and (6) is a manual operating device for a circuit breaker inspection grounding switch.

Further, in FIG. 3, (BUS) is a bus bar, (DS) is a disconnecting switch, (GCB) is a circuit breaker, (ES) is a ground switch, (CHD) is a cable connection part, and (VD) is a cable connection part. The voltage detector (CT) provided in (CHD) is a current transformer, and the single wire connection diagram for these is as shown in FIG.

The shield device provided in the connection portion (W) of such a GIS is configured as shown in FIGS. 5 to 8, for example.

In these drawings, (7) is a cylindrical fixed-side conductor,
(8) is a cylindrical movable side conductor, (9) is a mounting body,
The disc-shaped base (9a) is fixed to the left end surface of the fixed-side conductor (7) by a bolt described later, the cutouts (9b) are formed at equal intervals in the peripheral edge, and a horizontal mounting piece is integrally formed on the upper and lower sides. (9c)
Are formed.

Reference numeral (10) is a holding body, and a base portion (10a) obtained by processing the central portion of the disk into a concave shape is fixed to the left end surface of the fixed side conductor (7) together with the attachment body (9) by a bolt, and a peripheral portion The notch (10b) at the same pitch as the notch (9b) of the mounting body (9)
Are formed.

Then, a screw hole (11) is formed on the left end surface of the fixed conductor (7), and through holes (12) and (13) are provided in the center of the attachment body (9) and the holding body (10), respectively. , The mounting body (9) and the holding body (10), the notches (9b) and (10b) of the mounting body (9) and the holding body (10) overlap each other, and the through holes (12) and (13) overlap each other. Fixed side conductor (7) with body (10) joined together
Is applied to the left end face of the special bolt (14) and washer (15)
Also, the holding body (10) and the mounting body (9) are inserted into the through holes (13) and (12) through the spring washer (16) and screwed into the screw hole (11), and the holding body (10) and the mounting body (9) are fixed side conductors (7). It is fixed to the left end face of.

Further, (17) is an annular contactor called a tulip-shaped contactor, which has hook-shaped parts (1) on both left and right sides of the base part (18a).
A plurality of contact pieces (18) having 8b), each notch (9
b), (10b), and the ring spring (19) is attached to the hook-shaped part (18b) on the right side of each contact piece (18).
The right side of 7) is in pressure contact with the outer peripheral surface of the left end of the fixed side conductor (7), and the ring spring (19) is attached to the left hook part (18b) of each contact piece (18). The left side of 17) makes sliding contact with the outer peripheral surface of the right end of the movable conductor (8).

(20) is a first shield body arranged outside the right side of the contactor (17) and having a right end portion of the cylinder bent inward, (21)
Is a second shield body, which is disposed on the left outer side of the contactor (17), has a left end portion of the cylinder curved inward, and has a right end portion on the left end portion of the first shield body (20). Have polymerized to.

At this time, the upper and lower attachment pieces (9c) of the attachment body (9) are in contact with the insides of the overlapping portions of the shield bodies (20) and (21).

Reference numeral (22) is two rivets which are fixtures, and the upper and lower overlapping portions of both shield bodies (20) and (21) and both attachment pieces (9c) are pierced and crimped to overlap the overlapping portions. Are fixed to both mounting pieces (9c).

[Problems to be solved by the device]

In the above case, the axes of both rivets (22) are shown in FIG. 6 (a),
Since it is coaxial as shown in (b), operating vibration of the device,
Due to commercial frequency vibration due to energization and external force during assembly,
Centering around the axis of both rivets (22), both shields (20),
(21) may rotate, and the rotation may cause looseness at the joint between the shields (20), (21) and both mounting pieces (9c), causing abnormal vibration noise or There is a problem that the electrical connection becomes incomplete, partial discharge occurs, the effect of relaxing and improving the electric field cannot be obtained, and the performance of the device is deteriorated or damaged.

Conventionally, the above problems have been suppressed by reducing the weight of parts and strengthening the crimping force of the rivets (22), but they are insufficient and lack certainty.

The present invention has been made with the above points in mind, and it is an object of the present invention to prevent both shields from rotating and to reliably prevent abnormal vibration noise and partial discharge from occurring.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, an annular contactor whose right side is in pressure contact with the outer peripheral surface of the left end portion of the fixed-side conductor and whose left side is in sliding contact with the outer peripheral surface of the right end portion of the movable-side conductor, and is arranged outside the right side of the contactor. A first shield body, a second shield body disposed outside the left side of the contactor and having a right end portion superposed on a left end portion of the first shield body, and a base portion fixed to a left end portion of the fixed side conductor. An electric device including an attachment body in which upper and lower attachment pieces are in contact with the insides of the overlapping portions of both shield bodies, and a plurality of rivets, screws and the like fixing the overlapping portions to the attachment pieces, respectively. The shield device for a vehicle according to the present invention is characterized in that the axes of the both fixtures are shifted so as not to be coaxial.

[Action]

In the above-mentioned configuration, since the axes of both fixtures are shifted so as to be non-coaxial, both shields do not rotate due to external force, etc., and the loosened joint between the overlapping parts of both shields and both mounting pieces, The occurrence of electrical connection failure is prevented,
The occurrence of abnormal vibration noise and partial discharge as in the conventional case is prevented.

[Embodiment] An embodiment will be described with reference to FIG. 6, the same symbols as in FIG. 6 indicate the same or corresponding ones, and the difference from FIG. 6 is that the axes of both rivets (22) are shifted to the left and right to be non-coaxial.

When the axes of both rivets (22) are shifted to be non-coaxial in this way, the center of rotation of both shields (20), (21) is not formed, so that both shields (20), (21) are subject to external force or the like. It does not rotate.

In addition, although the axis lines of both rivets (22) are shifted to the left and right in the above-mentioned embodiment, they may be set to the front and rear sides as well as to the left and right, as long as the axis lines are not coaxial.

In addition to the rivet (22) described above, screws, bolts, nuts and the like may be used as the fixture.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

Since the axes of both fixtures have been shifted so that they are not coaxial, both shields do not rotate due to external force, etc., and the joint between the overlapping parts of both shields and the mounting piece becomes loose and electrical connection failure occurs. It is possible to prevent the occurrence of abnormal vibration noise and partial discharge as in the related art, and there is no risk of performance deterioration or damage of the device.

[Brief description of drawings]

1 (a) and 1 (b) are partially cutaway front views and right side views of one embodiment of a shield device for electric equipment of the present invention, and FIGS. 2 to 4 show a general GIS. Figure 2 (a),
(B) is a front view and a left side view, respectively, FIG. 3 is a front view showing the internal structure, FIG. 4 is a single line connection diagram, FIGS. 5 to 8 are conventional examples, and FIG. FIGS. 6 (a) and 6 (b) are a partial cutaway front view and right side view, FIG.
The figure is a partly separated perspective view, and FIG. 8 is a perspective view of a special bolt. (7) ... Fixed side conductor, (8) ... Movable side conductor, (9) ... Mounting body, (9a) ... Base part, (9c) ... Mounting piece, (17) ... Contact, (20) ... First shield Body, (21) ... Second shield body, (22) ... Rivet.

Claims (1)

[Scope of utility model registration request] 1. An annular contactor whose right side is in pressure contact with the outer peripheral surface of the left end portion of the fixed conductor and whose left side is in slidable contact with the outer peripheral surface of the right end portion of the movable side conductor, and a first contact arranged outside the right side of the contactor. 1 shield body, a second shield body disposed on the left outer side of the contact and having a right end portion superposed on the left end portion of the first shield body, and a base portion fixed to the left end portion of the fixed side conductor and A shield device for electric equipment, comprising: a mounting body in which a mounting piece abuts on the inside of the overlapping portion of both shield bodies; and a plurality of fixing tools such as rivets, screws, etc., which fix the overlapping portion to the mounting pieces, respectively. A shield device for an electric device, wherein the axes of the both fixtures are shifted so as to be non-coaxial.