JPH0747925Y2 - All-ground type high-voltage multi-circuit switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of an all-ground type high-voltage multi-circuit switch which is installed and used in a manhole buried underground.

[Prior art and its problems]

A high-voltage switch may be installed and used in an underground manhole due to reasons such as restrictions on the installation space above ground and stricter regulations for road management.

In this case, in order to avoid the influence of the surrounding environment such as flooding, gas, temperature, and geology as much as possible in the above switch, use a corrosion-resistant stainless steel plate for the case, and attach it to the case joint or case penetration. The airtightness is maintained by welding, an O-ring, etc., and the bushing cable is watertight and has a slip-on type connector to improve the airtightness reliability of the switch.

By the way, this type of sealed switch is equipped with a pressure relief device that promptly releases the internal pressure that rapidly rises in the event of an internal short-circuit accident to the outside of the case. The pressure relief device had a safety problem such as consideration of using the switch in the manhole, that is, the pressure relief direction during the pressure relief operation was not sufficiently examined.

[Specific means for solving problems]

The present invention aims to solve such problems and improve the safety at the time of pressure release, and at the same time, simplify the structure.

That is, a multi-circuit switch constituted by arranging a plurality of hermetically sealed unit switches side by side in a manhole, wherein a pressure release port, that is, a case, is formed on the upper surface of the case of each unit switch due to a sudden pressure increase in the case. The pressure release port forming part (28c) formed inside the upper surface (28a) of the case is destroyed by expansion of the case when the internal pressure of the case rises to form a pressure release port, and the pressure in the case raised from the pressure release port In an all-ground-type high-voltage multi-circuit switch that discharges air to the outside of the case, a pressure relief deflection plate (50) that doubles as a work platform is attached to the upper surface of the case to attach each corner of the deflection plate. (51) All earth-ground high pressure, characterized in that it is erected slightly above the upper surface of the case and forms a pressure release space (a) with an open side peripheral surface to cover the entire upper surface of the case. A multi-circuit switch is proposed.

〔Example〕

 Embodiments of the present invention will be described below.

Reference numeral 1 denotes an all-ground-type high-voltage multi-circuit switch installed in a manhole 2. As shown in FIG. 1, a corrocon (roller) type pedestal 3 is installed and fixed at approximately the center of the bottom surface 2a in the manhole. Further, on the same stand, three single switches 4, 5, 6 are arranged side by side.

These three switches are three types of switches: a manual high-voltage switch 4, an automatic high-voltage switch 5, and a switch 6 with SOG.
Here, SOG is an abbreviation for Storage Over Current, and SOG switch is a circuit that disconnects the circuit of an immediate switch in the event of a crossover accident, and the breaker on the power supply side operates when an overcurrent accident occurs and the high-voltage path is cut off. However, it is a switch equipped with a function of automatically opening it when the control power supply runs out, and is intended to protect high-voltage consumers.

As shown in the front view of FIG. 2 and the plan view of FIG. 4, bushings 7, 8, 9 of U, V, and W phases are provided on the front side of the manual high-voltage switchgear 4, Also, on the rear side there is a third
As shown in the rear view of the figure and the plan view of FIG. 4, U, V,
Bushings 16, 17, and 18 for each phase of W are provided.

Further, as shown in the front view of FIG. 2 and the plan view of FIG. 4, bushings 10, 11, 12 of U, V, and W phases are provided on the front side of the automatic high-voltage switch 5, Also, on the rear side there is a third
As shown in the rear view of the figure and the plan view of FIG. 4, U, V,
Bushings 19, 20, and 21 for each phase of W are provided.

Further, as shown in the front view of FIG. 2 and the plan view of FIG. 4, bushings 13, 14, 15 for each phase of U, V, W are provided on the front side of the switch 6 with SOG, and As shown in the rear view of FIG. 3 and the plan view of FIG. 4, bushings 22, 23, 24 of U, V and W phases are provided on the rear surface side.

In the rear view of FIG. 3, busbars 25, 26, and 27 of U, V, and W phases are provided on the rear side of the switches 4, 5, and 6, respectively. The busbars 25, 26, 27 of the respective phases are formed in a T shape divided into the respective switches 4, 5, 6 and are prefabricated, and are provided in the horizontal portions 25a, 26a, 27a. The switches 25, 26c, 27c are connected to each other, and the switches 4, 5, 6 can be connected and disconnected.

Further, from the horizontal portion 25a of the U-phase bus bar 25, the vertical portion 25 for the U-phase that rises upward for each of the switches 4, 5, and 6.
b, 25b, 25b are branched to form a horizontal portion 26a of the V-phase bus bar 26.
The vertical parts 26b, 26b, 26b for the V phase rising upward for each of the switches 4, 5, 6 are branched from the switch, and the horizontal parts 27a of the bus bar 27 for the W phase are further connected to the switches 4, 5, 6. , 6 vertical portions 27b, 27b, 27b for the W phase rising upward are branched.

The connectors at the tips of the vertical portions 25b, 26b, 27b of the U, V, W phases for the manual high-voltage switch 4 are connected to the bushings 16, 17, 18 on the rear side of the manual high-voltage switch 4, respectively. Corresponding to, is detachably attached and connected.

The vertical part of each phase of U, V, W for the automatic high-voltage switch 5.
The connectors at the tips of 25b, 26b, and 27b are detachably attached and connected to the bushings 19, 20, and 21 on the rear surface side of the automatic high-voltage switch 5 in correspondence with the phases.

Further, the vertical portion 25b of each phase of U, V, W for the switch 6 with SOG,
The connectors at the tips of 26b and 27b are detachably attached and connected to the bushings 22, 23 and 24 on the rear surface side of the SOG type high-voltage switch 6 in correspondence with the phases.

In the front view of FIG. 2 and the plan view of FIG. 4, 32, 33,
34 is a U-phase, V-phase provided on the front side of the manual high-voltage switch 4,
Bushings 7, 8, 9 for the respective phases U, V, W provided on the front side of the manual high-voltage switch 4 with W-phase cables.
On the other hand, the phases are matched with each other, and they are watertight and are connected by a slip-on type connector.

35, 36, 37 are U-phases provided on the front side of the automatic switch 5,
B-phase and W-phase cables that are provided on the front side of the automatic high-voltage switchgear 5 and have bushings 10, 11 for the U, V, and W phases, respectively.
12 are connected in the same manner as above.

38, 39 and 40 are U phase and V provided on the front side of the switch 6 with SOG
Phase and W phase cables are connected to the bushings 13, 14, 15 of the U, V and W phases provided on the front side of the switch 6 with SOG in the same manner as above.

The electric circuits of the three switches 4, 5, 6 are shown in FIG.

This FIG. 9 shows a circuit only for the U phase, and in this figure, the U on the rear side of the manual high-voltage switchgear 4 in this figure is shown.
The electric wire of the vertical portion 25a of the U-phase bus bar 25 is connected to the phase bushing 16 and the cable 30 is connected to the U-phase bushing 7 on the front side, and the power supply side distribution line (cable) 70 is connected to the cable 30. Are connected.

Further, the electric wire of the vertical portion 25a of the U-phase bus busbar 25 is connected to the U-phase bushing 19 on the rear side of the automatic high-voltage switch 5, and the cable 35 is connected to the U-phase bushing 10 on the front side. Cable 35 to load side distribution line (cable)
80 is connected.

Further, the electric wire of the vertical portion 25a of the U-phase bus busbar 25 is connected to the U-phase bushing 22 on the rear side of the switch 6 with SOG, and the cable 38 is connected to the U-phase bushing 13 on the front side. A branch line (cable) 90 for connecting a high-voltage customer is connected to 38.

Although the V-phase and W-phase circuits are omitted in FIG. 9, they are wired in the same manner as the U-phase. The electric wires and bushings of the V phase and the W phase, which are the same as those of the U phase, are shown with parenthesized symbols.

Each of the switches 4, 5 and 6 is composed of a gas switch as shown in FIG. 5 to FIG. 7, and as is well known, a predetermined pressure is applied in an airtight stainless steel case 28. SF ₆ gas (b) (see FIG. 5) is filled. The present invention has a common configuration for all switches.

FIG. 5 is a right side view of FIG. 2 and shows the switch 6 side with SOG.

FIG. 6 is an enlarged cross-sectional view showing the inside of the circle A part of the chain line in FIG. 5, and is the upper wall 28d of the case 28 of the switch 6 shown in FIG.
The section of a part is shown.

In FIG. 6, 28d is an upper wall of the case 28, and a pressure release port forming portion 28c formed of a V groove is formed on the inner side surface thereof. The pressure release port forming portion 28c is weakened from the other upper wall portion by the V groove, and due to the occurrence of an internal short circuit, the case
When the pressure in 28 rapidly increases, the pressure release port forming portion 28c is destroyed by the pressure, and the increased pressure in the case 28 is released from the portion 28c to the outside of the case 28. Further, the pressure release port forming portion 28c is formed in a substantially mountain shape as a whole, and a pressure release port having a size that does not scatter the components in the case 28 at the time of destruction thereof is formed.

In FIG. 6, reference numeral 29 is a pressure release device including an actuating plate 30 and a support rod 31, and forcibly destroys the pressure release port forming portion 28c when the pressure inside the case 28 rises sharply as described above. This is what you do. This pressure release device 29 is a known device and is described in, for example, Japanese Utility Model Publication No. 57-25468. The operation plate 30 shown in FIG. 9 is close to the pressure release port forming portion 28c and fixed to the upper wall 28d of the case, and the support rod 31 pivotally connected to the operation plate 30 is used to increase the pressure of the case 28. The deformation (expansion) is used to pull at once and the pressure release port forming portion 28c is forcibly broken.

The pressure release port forming portion 28c as described above is also formed in the other switches 4 and 5.

In FIG. 2 and FIG. 5, reference numeral 41 is for activating the movable electrode for grounding (not particularly shown) in the case of each of the switches 4, 5, 6 for grounding, or vice versa. It is a drive shaft for grounding and is provided on each of the switches 4, 5, and 6. The coaxial is connected to a grounding operation shaft 43 provided in a front corner on the upper surface side of each case via a grounding connecting rod 42 provided in each switch 4, 5, 6.

An operation handle 44 such as a T-shaped or L-shaped wrench as shown in FIG. 8 can be fitted to the operation shaft 43.
By fitting and rotating the handle 44, the grounding movable electrodes of the switches 4, 5, 6 are grounded or ungrounded.

In FIG. 5, reference numeral 45 denotes a display plate which is integrally and coaxially operated when the ground operation shaft 43 is operated.

In FIGS. 2 and 5, reference numeral 46 denotes a drive shaft which is connected to a movable electrode (not particularly shown) of the switch, and the switches 4, 5, 6 are connected.
It can be remotely operated from an operation unit in another handhole installed at a position away from.

That is, one end of a flexible push-pull cable (hereinafter referred to as a release) 60 for force transmission (see FIGS. 2 and 5).
The lower side in the figure is connected to the operating portion in the handhole, the other end (upper side) is connected to the drive shaft 46 via the operating plate 61, and the push-pull cable 60 is operated by the operating portion (not shown).
By moving up and down, the movable electrodes (not shown) of the switches 4, 5 and 6 are opened and closed.

Further, in FIG. 2, the drive shaft 46 and the lower end portion 47a of the connecting rod 47 are shown.
Are placed in a interlocking relationship in the switches 4, 5 and 6, and the connecting rod 47 is opened by opening and closing the movable electrode, that is, by rotating the drive shaft 46 forward and backward.
Is designed to move up and down.

The upper end of the connecting rod 47 is connected to a display plate 48 (see FIGS. 2 and 4) provided on the upper surface 28a side of the case 28, and the display plate 48 is moved by the connecting rod 47 moving up and down. When the display 48 moves, the open / closed state of the switch is displayed on the upper surface of the case.

A cutout window B as shown in FIG. 4 is formed in the upper part of the display plate 48 so that the display plate 48 can be seen from the upper part of the switch.

Further, as shown in FIGS. 2 and 5, the drive shaft 46 of each of the switches 4, 5, and 6 has its end portion projected outwardly on the front surface 28b side of the case 28, and the projection thereof. The end is formed in a polygonal shape, and the operation handle 44 used in the operation of the grounding operation shaft 43 can be detachably fitted to the protruding end. That is, the operation handle 44 is also used as the grounding operation shaft 43 and the drive shaft 46.

5 and FIG. 6 which is an enlarged view of the upper part of FIG.
Reference numeral 49 denotes a screw portion projectingly fixed to the outer surface of the upper part of the case, and a pressure relief deflecting plate 50 made of a strip steel plate having an anti-slip 50a on the upper surface side is attached to the screw portion 49.

The pressure-releasing deflection plate 50 is attached so as to cover the entire upper surface 28a of the case 28, and when the deflection plate 50 is mounted, the pressure-releasing deflection plate 50 is appropriately released between the plate 50 and the upper surface 28a of the case. A space a is formed. Reference numeral 51 is an L-shaped mounting piece fixed to the lower surface side of each corner of the deflection plate, the vertical portion 51a thereof is screwed to the above-mentioned screw portion 49, and the vertical portion 51b thereof is the lower surface side of the pressure relief deflection 50. It is fixed by welding. Further, a nut 52 is fixed to the lower surface side of the horizontal portion 51b, and the deflection plate is attached to the nut 52.
The threaded portion of the lower portion of the hanging hook 54 is inserted from the upper side of 50, and the hook is screwed and fixed to the upper surface side of the deflection plate 50.

When installing the pressure relief deflection plate 50, the L-shaped mounting piece 51
Is used at three places, and the remaining one is screwed to each other by a piece 53a, an L piece 53b, and a piece 53c.
A mounting piece 53 consisting of two divided pieces is used, the lower end of the shape piece 53a is screwed to the screw part 49 on the side surface of the case, and the end of the shape piece 53c is the end of the pressure relief deflection plate 50. It is screwed to.

That is, the side peripheral surface of the pressure release space a is open except for the attachment pieces 51, 53.

Next, the pressure release operation will be described with reference to FIG.

When an internal short circuit occurs in the switches 4, 5 and 6 due to some abnormal cause, a rapid increase in internal pressure occurs in the case 28, which causes the upper wall 28d of the case 28 to expand and the V-shaped groove. The pressure release port forming portion 28c made of is destroyed to form a pressure release port. At this time, the pressure release device 29 such as the operating plate 30 and the support rod 31 forcibly breaks the pressure release port forming portion 28c to form the pressure release port. When the pressure release port is formed, pressure is released upward from the pressure release port, that is, into the pressure release space a formed by the deflection plate 50 and the upper surface 28a of the case 28. The pressure is indicated by the arrow a in FIG. As shown in the figure, after colliding with the lower surface side of the deflection plate 50, it is deflected in four directions along the lower surface of the deflection plate 50, and is dispersed and discharged from the side of the open space a.

Therefore, in this case, even if there is an operator on the deflection plate due to the grounding work, the pressure will not be directly exerted.

[Effect of device]

With the above configuration, even if there is an operator on the deflection plate when the grounding work is performed and the switch releases pressure, and the pressure is released from the pressure release port on the top of the switch case, the same pressure will change. After colliding with the lower surface side of the facing plate, it is diverted to a safe side where there is no worker, and is rapidly dispersed and released from the side peripheral surface of the pressure release space a, so that deformation and heating of the diverting plate are performed as much as possible. Since it can be prevented and the discharge pressure is not directly received, the safety of the worker on the deflection plate can be further enhanced.

Further, since the deflecting plate also serves as a step for the worker at the time of grounding work, the structure can be simplified without a special step.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an explanatory view showing a state in which an all-ground high-voltage multi-circuit switch is installed in a manhole, FIG. 2 is a front view of the multi-circuit switch, and FIG. 3 is a rear view, FIG. 4 is a plan view, FIG. 5 is a partially cutaway side view, FIG. 6 is an enlarged cross-sectional view within the chain line circle of FIG. 5, and FIG. FIG. 8 (A) and FIG. 8 (B) are views showing two examples of the wrench-shaped operation handle to be used, and FIG. 9 is an all-ground-type high pressure multi-purpose unit of the present invention. The single-line circuit diagram of a circuit switch is shown. 1 ... All-ground high-voltage multi-circuit switch, 4 ... Manual high-voltage switch, 5 ... Automatic high-voltage switch, 6 ... High-voltage switch with SOG, 28a ... Top surface, a ... For pressure release Space, 43 …… Grounding operation shaft, 50 …… Pressure relief deflection plate,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Kumazawa 1 20-20 Kitakousan, Otaka-cho, Midori-ku, Nagoya-shi, Aichi Chubu Electric Power Co., Inc. Electric Power Technology Research Institute (72) Inventor Takashi Kaneko Nagafugusa, Aichi Prefecture 35, Mikkamachi, Japan Technical Research Institute, Japan High Voltage Electric Co., Ltd. (72) Inventor, Kunio Mitsuguchi, No. 1 Kogami Needle, Inuyama City, Aichi Prefecture (56) Reference: JP-A-58-182402 (JP, 1982, 402) A) Actual opening 3-130134 (JP, U) Actual opening 1-166941 (JP, U) Actual opening Sho 63-198313 (JP, U) Actual opening Sho 58-83905 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A multi-circuit switch comprising a plurality of hermetically sealed unit switches arranged side by side in a manhole, the pressure releasing port being provided on the upper surface of the case of each of the unit switches by a rapid pressure increase in the case. That is, the pressure release port forming portion (28c) formed inside the upper surface (28a) of the case is destroyed by the expansion of the case when the internal pressure of the case rises to form the pressure release port, and the case that rises from the pressure release port In an all-ground-type high-voltage multi-circuit switch in which the pressure inside is released to the outside of the case, a pressure release deflection plate (50) that also serves as a work platform is provided on the top surface of the case. A mounting piece (51) for supporting a corner is installed so as to be slightly levitation above the upper surface of the case to form a pressure release space (a) with an open side peripheral surface to cover the entire upper surface side of the case. All-ground high-voltage multi-circuit switch.