JPH03668Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a disconnector with a grounding device used, for example, as one of the facilities of a power plant or a substation.

BACKGROUND OF THE INVENTION A disconnect switch, which is one of the facilities of a power plant or a substation, generally has both the current-carrying part and the mechanical part exposed outdoors, and the same applies to the grounding device attached to the disconnect switch. Therefore, due to external environmental conditions such as snow accumulation, freezing, or dust, the exposed current-carrying parts and mechanical parts will increase the friction of the sliding contact parts and bearing parts, leading to malfunction of the disconnector and the grounding device. There are many examples. The current-carrying part of the disconnector has a structure in which the movable electrode enters the clip-shaped fixed electrode when closing the circuit, and then the movable electrode twists and contacts the fixed electrode. As the force is reduced, operational problems are relatively eliminated, and even if malfunction occurs, there is almost no chance of injury or death. However, the purpose of the grounding device is to ground the charging current of the line, the substation bus, and equipment, or the current induced from other circuits, so that inspection of the line, substation bus, and equipment can be carried out safely. If inspection work on tracks, station contamination, or equipment is carried out when it is uncertain whether the grounding device will be turned on, there is a risk of personal injury.

On the other hand, in the conventional disconnector with a grounding device, as shown in FIG. Since the grounding movable electrode 15 corresponding to the contactor 11 was fixed to the supported grounding opening/closing operation shaft 13 via the mounting piece 14, the energizing part of the grounding device was located between each phase of the disconnector. Therefore, the dimension of the disconnector in the phase-to-phase direction must be increased, resulting in a disadvantage that the installation area of the disconnector becomes large.

Purpose of the invention The present invention was made in order to eliminate the above-mentioned conventional defects, and its purpose is to prevent malfunction of the grounding device due to environmental conditions such as snow accumulation, freezing, or dust adhesion, thereby preventing personal accidents. To provide a disconnecting switch with a grounding device which can reduce the space between phases, reduce the installation area by reducing the dimension between the phases, and easily attach and detach the grounding device to the main body of the disconnecting switch.

Structure of the invention In order to achieve the above object, the present invention connects a support insulator containing a fixed electrode for grounding, a mechanical case containing a pinion for grounding opening/closing operation, and a protective case on almost the same axis in the vertical direction. A closed type grounding device is formed by housing a movable grounding electrode which is fixed and has a rack engraved in the sealed space that engages with the pinion so as to be able to slide back and forth via a bearing provided in the mechanism case. The circuit-side support insulator chain and the support insulator tube are arranged and fixed in parallel to one end of the disconnector base via a mechanism case so that they are located almost on the same straight line, and the upper fixed electrode of the sealed grounding device and the circuit-side support are fixed. A configuration is adopted in which the electrodes are electrically connected by a conductor.

Embodiment Hereinafter, a basic embodiment embodying the present invention will be explained with reference to FIGS. 2 and 3. A pair of front and rear frames 1 which are erected and fixed on a foundation are provided with a groove-shaped base 2 at the upper end. has been erected. Support insulators 3 and 4 are erected on the top surface of both ends of the base 2, and clip-shaped contacts 5 and 6 as fixed electrodes on the electric circuit side are fixed to their top ends. Similarly, an opening/closing operation lever 7 is supported on the central upper surface of the base 2 so as to be rotatable in the horizontal direction, and a support insulator 8 is rotatably supported on the operation lever 7. A movable electrode 9 corresponding to both the contacts 5 and 6 so as to be movable toward and away from them is supported horizontally.

A square box-shaped mechanism case 16 is fixed to one end of the base 2, a support insulator tube 17 is erected and fixed on the upper surface of the mechanism case 16, and a cover plate 18 is fixed to the upper end surface of the support insulator tube 17. A tulip-shaped contact 19 is fixed to the inner surface of the device as an upper grounding fixed electrode of the device. The contact 19 is connected to the cover plate 1
It is electrically connected to the contactor 6 by a conductor 20 connected to the contactor 8 and the contactor 6.

Bearings 21 and 22 are provided at two upper and lower locations inside the mechanism case 16 so as to be located on the central axis of the support insulator tube 17, and a ground movable electrode 23 is slidable in the vertical direction relative to the bearings 21 and 22. Moreover, it is supported so as to be able to move toward and away from the contactor 19. Further, a tulip-shaped contact 24 is fixed to the upper surface of the mechanism case 16 as a lower fixed electrode of a grounding device that is in constant contact with the grounding movable electrode 23.

An operating shaft 25 for grounding open/close common to each phase is supported through the mechanism case 16 in the direction between the phases, and a pinion 27 that meshes with a rack 26 carved in the movable grounding electrode 23 is fitted onto the operating shaft 25. When this pinion is reciprocated, the ground movable electrode 23 is reciprocated in the vertical direction and is turned on and off with respect to the contactor 19. Similarly, the mechanism case 16
A cylindrical protective case 28 that accommodates the ground movable electrode 23 when the electric circuit side is closed is fixed downward to the bottom surface of the housing.

The above-mentioned mechanism case 16, support insulator tube 17, and protective case 28 are connected and fixed vertically on substantially the same axis, and there is a contact point as a grounded fixed electrode in the sealed space formed by these three members. The movable electrodes 19 and 24, a ground movable electrode 23, and a pinion 27 for operating the movable electrode 23 are accommodated therein. Further, in the sealed earthing device constructed in this manner, the support insulator tube 17 is arranged on the same straight line as the support insulator series 3, 4, 8 on the disconnector side, which are erected on the base 2.

Furthermore, the above-mentioned disconnecting switch with earthing device is arranged in parallel in multiple phases in the left and right direction, and the operation lever 7 of each phase is turned on and off at the same time by a common operation mechanism (not shown). There is.

Next, the operation of the disconnector with a grounding device configured as described above will be explained.

In FIGS. 2 and 3, the movable electrode 9 is connected to the contacts 5 and 6.
The figure shows a closed state of the disconnector when it is turned on, and shows a non-grounded state where the ground movable electrode 23 is separated from the contactor 19. In this state, open/close operation mechanism (not shown)
When the operating lever 7 is rotated in the direction of the arrow in FIG. will be released. Next, when the operation shaft 25 is rotated counterclockwise in FIG. 3 by the opening/closing operation mechanism (not shown) on the grounding device side,
The pinion 27 is also rotated in the same direction, and the pinion 27 is rotated in the same direction.
The ground movable electrode 23 meshed with the ground movable electrode 7 is moved upward and comes into contact with the upper contact 19 to be in a grounded state. In this way, the charging current is grounded to the earth via the power transmission line (not shown), the contact 6, the conductor 20, the cover plate 18, the contact 19, the grounding movable electrode 23, the contact 24, the mechanism case 16, the base 2, and the pedestal 1. Ru.

Now, in the embodiment of the present invention, the ground contacts 19 and 24, the ground movable electrode 23
Since the pinion 27 is installed internally, the increase in friction between the sliding contact part and the bearing part due to snow accumulation, freezing, or dust adhesion is eliminated, and the on/off operation of the grounding device is always performed smoothly, thereby preventing grounding failure. It is possible to prevent accidents resulting in injury or death.

In addition, in the embodiment of the present invention, the support insulator tube 17, mechanism case 16, and protective case 28 constituting the sealed grounding device are connected and fixed vertically on substantially the same axis, and the sealed grounding device is connected to the mechanism case 1.
Since the support insulator chains 3, 4, 8 on the disconnector side and the support insulator pipe 17 are fixed in parallel to one end of the disconnector base 2 via the disconnector 6, so that they are located almost on the same straight line, a grounding device is provided between each phase. The interphase dimension can be reduced compared to a conventional disconnector in which energizing parts are arranged, and as a result, the installation area of the disconnector can be reduced.

Furthermore, since the rack 26 is directly carved into the ground movable electrode 23, the vertical space can be made smaller than when a separate rack member is connected to the movable electrode, and the number of parts can be reduced. Moreover, since the rack has an integral structure rather than a joint structure, operational reliability can be improved.

Furthermore, in the embodiment of the present invention, the mechanism case 16, the support insulator tube 17, and the protective case 28 are arranged on the same axis, and the contactor 1 is placed in these sealed spaces.
9, 24, a grounding movable electrode 23, a pinion 27, etc. are incorporated to form a closed type grounding device, so the grounding device can be made compact.
Not only can the grounding device be easily attached and removed from the disconnector main body, but it can also contribute to the beautification of the disconnector.

Next, an embodiment in which the present invention is embodied to the extent that it can be actually manufactured will be described with reference to FIGS. 4 to 6.

Four (only two are shown) support bolts 29 are erected and fixed on the top surface of the end of the base 2, and an L-shaped mounting plate 30 is attached to the support bolts 29 with nuts 31.
It is installed so that its vertical position can be adjusted. Note that triangular reinforcing plates 32 are welded to both sides of the L-shaped mounting plate 30. The L-shaped mounting plate 3
The lower surface of the cap 33 fitted and fixed to the lower end of the support insulator 4 is attached to the upper surface of the horizontal portion 30a of the support insulator 4.
A mounting plate 36 serving as a conductor and a contact 6 are fastened together with bolts 37 on the upper surface of a cap 35 which is fixedly tightened by a cap 35 and fitted onto the upper end of the support insulator 4.

On the other hand, a pair of upper and lower brackets 38 are welded to one side of the mechanism case 16.
is brought into contact with the vertical portion 30b of the L-shaped mounting plate 30 and fixed by tightening with bolts 39, and the mechanism case 16 is attached to the base 2 via the support bolts 29 and the mounting plate 30.
It is attached to. This mechanism case 16 is composed of a cylindrical main body case 40 (to which the bracket 38 is welded) and upper and lower cover plates 41 and 42 welded to both upper and lower end surfaces of the main body case 40. A bearing 21' made of an insulating material such as tetrafluoroethylene is fitted and fixed on the upper surface of the cover plate 41, and a plurality of flange portions of a mounting ring 43 are fixed to the outer circumference of the lower end of the support insulator 17 by centimeters. It is tightened and fixed with bolts 44. Further, a contactor 46 is fixed by a bolt 47 to a mounting ring 45 fixed to the outer circumference of the upper end of the support insulator 17 by centimeters.
The mounting plate 36 is fixed with bolts 48. A sliding band 4 is provided on the inner peripheral surface of the contactor 46.
9 is fitted in two places, upper and lower, and a cylindrical contact 50 screwed and fixed to the upper end male screw portion 23a of the ground movable electrode 23 is inserted into the band 49. A cylindrical arc-extinguishing cylinder 51 made of an insulating material such as tetrafluoroethylene is suspended and fixed to the lower end of the contactor 46. Further, on the upper surface of the center part of the upper cover plate 41, a shield cylinder 5 is provided to surround the ground movable electrode 23 and to alleviate a steep potential gradient.
2 are erected.

A flange portion of a cylindrical contactor 24' is fixed to the lower surface of the lower cover plate 42 by bolts 53, and a cylindrical bearing 22' made of an insulating material such as tetrafluoroethylene is mounted on the inner peripheral surface of the upper end thereof. are mated and fixed,
A sliding band 54 is fitted onto the inner circumferential surface of the lower end, and a cylindrical contact 55 screwed onto the lower end male screw portion 23b of the ground movable electrode 23 is inserted into contact therewith. The diameter of the contactor 55 is formed to be larger than the diameter of the ground movable electrode 23, and as the ground movable electrode 23 moves downward, the contactor 50 is separated from the contactor 46, and at the same time, the contactor 55 is moved to the contactor 24'. The grounded movable electrode 2 is separated from the
3 is supported only by a pair of upper and lower bearings 21' and 22'.

Brackets 56 and 57 made of angle materials are tightened and fixed with bolts to the lower ends of the contactor 24', and between the lower ends of both brackets 56 and 57, a ground movable electrode 23 is used to hold the contactor 55 at the lowest movable position. A guide ring 58 is attached to guide and hold the lower end of the contact 55 in its normal position when the contact 55 is moved. Also, in the center of one bracket 57, there is a limit switch LS1 for detecting the grounding condition.
is attached, and a limit switch LS2 for detecting a non-grounding state is attached to the lower part thereof, and is activated by an annular protrusion 55a integrally formed on the outer periphery of the contactor 55. .

The upper end flange portion of a bottomed cylindrical protective case 28 is tightened and fixed to the lower surface of the lower cover plate 42 by bolts 59, and the central axis of the protective case 28 is connected to a limit switch by a certain distance from the central axis of the ground movable electrode 23. It has been displaced to the LS1 and LS2 sides (see Figure 6). The protective case 28 and the mechanism case 1
6 are communicated with each other by a passage 42a provided through the lower cover plate 42.

As shown in FIG. 5, a cylindrical shaft support tube 60 for supporting the operating shaft 25 is fixed through the main body case 40 of the mechanism case 16 at two locations, and the outer end of the shaft support tube 60 is fixed to the main body case 40 of the mechanism case 16. The operating shaft 25 is rotatably supported via a bearing plate 61 and a radial bearing 62. Similarly, a cylinder 63 for a window through which the pinion 27 can be viewed is fixed to one side of the main body case 40, and a cover plate 64 is fastened to the outer end flange portion of the cylinder 63 with bolts. Furthermore, a pipe 66 that connects a nozzle 65 for sealing gas such as SF6 into the mechanism case 16 is fixed to one side of the main body case 40 through the main body case 40 .

The operations and effects of the grounding device configured in this manner are substantially the same as those of the basic grounding device described above.

Effects of the invention As detailed above, the present invention prevents the friction of the sliding contact part and bearing part of the grounding device from increasing due to environmental conditions such as snow accumulation, freezing, or dust, and improves the on/off operation. It is possible to prevent personal accidents due to malfunction of the grounding device by ensuring smooth operation at all times, and the installation area can be reduced by reducing the dimension between the phases.Moreover, the rack is engraved directly on the movable grounding electrode. Therefore, the space required in the vertical direction can be made smaller than when a separate rack member is connected to the movable electrode, and the number of parts can be reduced, and since the rack has an integrated structure rather than a joint structure, it is easy to operate. Reliability can be improved, and since the earthing device is made more compact, the earthing device can be easily attached to and removed from the disconnector main body, and the disconnector can be more beautiful.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional disconnector with a grounding device, with the disconnector closed and the grounding device open, and Fig. 2 is a perspective view of a disconnector with a grounding device according to an embodiment of the present invention, with the disconnector closed and the grounding device open. FIG. 3 is an enlarged sectional view showing the grounding device in an open state; FIG. 4 is a sectional view of the center of the embodiment of the present invention; FIG. 5 is a cross-sectional view of the center of the mechanism case; Figure 6 is a cross-sectional view of the protective case. 3, 4, 8...Support insulator, 6...Contactor as a fixed electrode on the electric circuit side, 16...Mechanism case, 17...
...Support insulator, 19...Contactor as the upper fixed electrode of the grounding device, 20...Conductor, 23...Movable grounding electrode, 24...Contactor as the lower fixed electrode of the grounding device, 25...Operation shaft, 26...Lack, 27
...Pinion, 28...Protective case.

Claims (1)

[Scope of Claim for Utility Model Registration] A support insulator tube 17 containing fixed electrodes 19 and 24 for grounding, a mechanism case 16 containing a pinion 27 for grounding opening/closing operation, and a protective case 28 are arranged on substantially the same axis in the vertical direction. A ground movable electrode 23 having a rack 26 engraved therein which engages with the pinion 27 is housed in these sealed spaces so as to be slidable back and forth via bearings 21 and 22 provided in the mechanism case 16. The formed sealed grounding device is installed in parallel to one end of the disconnector base 2 through the mechanism case 16 so that the electrical circuit side support insulator series 3, 4, 8 and the support insulator tube 17 are located on almost the same straight line. A disconnector with a grounding device, characterized in that the upper fixed electrode 19 of the sealed grounding device and the fixed electrode 6 on the circuit side are electrically connected by a conductor 20.