JPH10112905A - Disconnector with earthing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a disconnector with an earthing device that allows relaxation for restrictions on the position of enclosure installation. SOLUTION: An insulating frame 3 molded from epoxy resin is secured on the back face of an operating mechanism 1 with a mounting plate 2, in-between in the forward and backward direction. Recesses 3h, 3k, 3g, 3j1 are formed at the front and rear parts of the upper part of the insulating frame 3 and the front and central parts of the lower part, and contacts 4A, 4B are housed in the recesses 3h, 3j1 symmetrically with respect to the forward and backward directions. A disconnecting rod 7 for earthing is inserted into the upper contacts 4A, 4B in such a manner that the rod protrudes from the operating mechanism 1. An insulating disconnecting rod 6 is inserted into the lower contacts 4A, 4B from front, and an insulating shaft 6a at the front end of the insulating disconnecting rod 6 is connected to the rear end of an operating rod 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disconnector with a grounding device.

[0002]

2. Description of the Related Art FIG. 3 is a right side view showing an example of a gas-insulated metal closed switchgear in which a conventional disconnector with a grounding device is housed together with a vacuum circuit breaker, and FIG. 4 is a partially enlarged detailed view of FIG. Shows the case of a power receiving board.

In FIG. 3, a door 23a is provided at the front end of a box 23 made of steel plate so as to be openable and closable, and a door 23b is also provided at the rear end of the box 23. A partition 23c is provided at the center front of the box 23 to partition the box 23 forward and backward airtightly. At the center rear of the box 23, a partition 23f is also provided vertically.

[0004] An L-shaped partition 23e is formed airtightly above the box 23 with respect to the rear side of the front partition 23c. Above the partition 23e, a ceiling plate of the box 23 is formed. In an unillustrated plan view, a rectangular thick plate flange 23d is hermetically welded to the upper surface of the not-shown rectangular opening.

As a result, the box 23 is made up of the partition 23c and the partition 23e.
And a single load-side disconnector chamber 31A is formed between the
A power supply side disconnector chamber 31B shared with the vacuum circuit breaker is formed between c, 23e, and 23f.

Of these, an opening, which is not described in detail, is formed above the partition wall 23c at the center front side.
The disconnecting switch 17A assembled to the mounting base protrudes the disconnecting portion into the load-side disconnecting switch chamber 31A, and is penetrated in an airtight manner. Protruding into the low pressure chamber.

[0007] At the upper end of the disconnecting portion of the disconnector 17A, there is shown a grounding disconnector 16A which is opened and closed by swinging the blade in an arc shape about the lower end as shown by a broken line. The dashed line shown in (1) indicates the trajectory of the operation when the blade of the disconnector 17A is turned on or opened, and the position at the time of opening.

At the lower end of the partition wall 23e forming the gas chamber of the high-pressure section of the disconnector 17A, an insulating spacer 20 having a conductor penetrated in the center is penetrated. The terminal at the upper end of the insulating spacer 20 is It is connected to the lower terminal of the upper disconnector 17A via a conductor connected to a contact 33 described later with reference to FIG.

Below the disconnector 17A, a high-pressure vacuum circuit breaker 18 assembled to a mounting base is hermetically provided through an opening (not shown) formed in the partition 23c. The operation mechanism 18a on the front side of the high-pressure vacuum circuit breaker 18 also protrudes from the low-pressure chamber on the left side of the partition wall 23c.

An upper terminal protruding from the rear upper portion of the high-pressure vacuum circuit breaker 18 is connected to a terminal at the lower end of the insulating spacer 20 via an L-shaped conductor.

An upper end of a conductor 11F, which is vertically disposed below the lower terminal, is connected to a lower terminal protruding from a lower rear portion of the high-pressure vacuum circuit breaker 18. The upper and lower parts are supported by insulators 19 fixed to a pair of support members (not shown) provided in a direction perpendicular to the paper with respect to the center of the member 23.

Below the high-pressure vacuum circuit breaker 18, a disconnector 17B identical to the upper disconnector 17A is symmetrically provided through the partition wall 23c, and the lower end of the disconnector 17B is also connected to the upper ground disconnector. Table 16
A ground disconnecting switch 16B of the same product as A is installed upside down.

The upper terminal of the disconnector 17B has the above-described conductor.
The lower end of 11F is connected via a contact. On the other hand, a lower front end of a substantially J-shaped conductor 11E vertically arranged at the center of the box 23 and slightly rearward thereof is connected to a lower terminal of the disconnector 17B via a contact. The conductor 11E is supported via an insulator 19 fixed to the front side of a pair of supporting hardware (not shown) provided in the direction perpendicular to the paper with respect to the upper and lower portions of the center of the box 23.

A voltage detector 15 is fixed to the rear side of the disconnector 17B via a support metal (not shown), and a terminal (not shown) protruding from the lower end of the voltage detector 15 is connected to a conductor 11F via a conductor 11G. It is connected to the.

A three-phase circular opening (not shown) is formed in the flange 23d welded to the center of the ceiling plate of the box 23. These openings are provided in Japanese Patent Application Laid-Open No. 60-160309. T-shaped bushing 24 improved from the T-shaped bushing shown
Are airtightly provided through an O-ring (not shown).

The T-shaped bushing 24 is formed into a box body through a mounting saddle formed in a substantially Ω shape and having a flange welded to the lower end, and a bolt inserted into the flange of the mounting saddle.
23 is airtightly fixed to the flange 23d.

At both ends of the T-shaped bushing 24, a high-pressure cross-linked polyethylene cable (hereinafter referred to as a cable) is provided.
14 are connected, and the outer sheath of these cables 14 is formed on both sides of the insulating layer of the T-shaped bushing 24, together with a protective tube (not shown), a press fitting and a stress cone (not shown) inserted inside the protective tube. As shown in FIG. 8 of Japanese Patent Application Laid-Open No. 60-160309, bolts are pressed against the inner peripheral surface of a not-shown frustoconical cable receiving port, and are fixed airtightly.

The other end (not shown) of each cable 14 is connected to a box 23
Are connected to respective T-shaped bushings penetrating through a ceiling plate of a power supply panel (not shown) adjacent to the power supply panel. On the other hand, a cable head 13 is air-tightly fixed on the rear side of the upper end of a partition wall 23f provided vertically at the center rear side of the box body 23.
The upper end of the conductor 11E is connected to a terminal protruding from the left end of the conductor 13.

Below the cable head 13, a pair of penetrating current transformers 32 is fixed to the partition wall 23f. Further below the current transformer 32, the cable support 21 is attached. The cable 12 on the power supply side raised from the pit 22 provided on the installation floor of the box 23 penetrates the cable support 21 and the current transformer 32, and the cable 12 is attached to the lower part of the partition wall 23f. Supported by a cable support 21, the upper end is connected to the cable head 13.

In FIG. 4 showing an enlarged detailed view of the disconnecting switch 17A shown in FIG. 3, a three-phase insulator 25 is provided on the rear surface of a disconnecting portion mounting base 17b which is provided airtightly at the rear of the operating mechanism 17a. Are fixed up and down.

On the rear surface of these insulators 25, the front ends of L-shaped connection conductors 26 are fixed with bolts.
A rectangular connecting conductive plate 26a is brazed to a central portion of the opposing surface. Further, the connection conductor 26 on the upper side
Ground terminal 16 bent at an obtuse angle to the upper surface of 26a
One side of c is fixed with bolts.

The lower ends of the pair of blades 28 are supported on the lower connection guide plate 26a via a support shaft 29 via a pressure spring (not shown). In FIG. 4, the tip of the blade 28 is
According to the retreating operation of the insulating operation lever 27 projecting rearward from the drive mechanism incorporated in the operation mechanism 17a, it is fitted to the upper connection guide plate 26a and is in the closed state.

A bearing 16b is provided above the disconnector mounting base 17b.
Is protruded behind the operation mechanism 17a. This bearing
Insulated operating shaft 16c penetrated in the direction perpendicular to the plane of paper with respect to 16b
, The base end of the blade 16a of the grounding disconnector 16A is fixed. The lower disconnector 17B and the ground disconnector 16B
The upper and lower disconnectors 17A and 16A are assembled upside down.

At the rear ends of the upper and lower connection conductors 26, the front side of a substantially cylindrical contact 33 is fitted and fixed. The T-shaped bushing shown in FIG.
The front end of a conductor 30A connected to the lower end of 24 is fitted, and the front end of a conductor 30B connected to the upper end of the spacer 20 shown in FIG.

In the disconnector with a grounding device thus constructed, the blades 16a of the disconnectors 16A and 16B are used to confirm that the vacuum circuit breakers connected in series to the disconnectors 16A and 16B are open. The condition is applied and the electrode is opened.

In the gas insulated metal closed switchgear constructed as described above, sulfur hexafluoride gas (SF ₆ gas) is provided in an airtight chamber between the partition wall 23c and the right upper partition wall 23e and the partition wall 23f. 13 are enclosed.

Due to the insulating properties of the sulfur hexafluoride gas 13, the withstand voltage value between the box 23 and the metal fittings disposed inside the box 23 and the main circuit charging parts such as the conductors 11E and 11F is determined. And the miniaturized grounding disconnectors 16A, 16B
The high-pressure section also reduces the size of the box 23, thereby reducing the required installation area of the power receiving and transforming equipment.For example, in a gas insulated metal closed switchgear installed in a power receiving room of a city building. Respond to requested user specifications.

[0028]

However, in the gas insulated metal closed switchgear constructed as described above, the upper and lower grounding disconnectors 16A and 16B and the upper and lower blades of the disconnectors 17A and 17B are turned on and off. Since the space occupied in the direction is required widely, it becomes an obstacle in further downsizing the box 23.

That is, in FIG. 4, in order to obtain a predetermined insulating gap G3 between the tip of the blade 28 and the contact 33 at the time of disconnection indicated by a chain line, the opening angle θ of the blade 28
Must be increased.

Then, the operation stroke and the swing angle of the insulating operation lever 27 also increase, so that not only the driving mechanism inside the operating mechanism 17a becomes large, but also the sealing structure of the base of the insulating operating lever 27 becomes complicated. Become.

The tip of the insulating operating lever 27 and the blade
A method of reducing the stroke of the insulated operating lever 27 by moving the connecting portion with the blade 28 toward the base end side of the blade 28 is also conceivable, but since this method requires increasing the driving force of the insulated operating lever 27, The drive mechanism of the operation mechanism 17a becomes large.

Therefore, the height of the box installed in the basement of the building cannot be reduced, so that the workability of the cable connection work of the T-shaped bushing provided at the upper end of the box cannot be prevented. .

On the other hand, with the soaring land prices in cities and the size of buildings, the demand for downsizing large-capacity power receiving equipment provided in these large buildings is increasing, and gas-insulated metal closed switchgears are required. Are required to be further miniaturized. Therefore, an object of the present invention is to provide a disconnector with a grounding device that can reduce restrictions on the installation location of a box.

[0034]

According to a first aspect of the present invention, there is provided a disconnector with a grounding device, wherein a first contact and a second contact which are opposed to each other are housed in a front part on one side, and are connected to each other. 3rd opposition
And the fourth contact are accommodated in the rear part of the other side, and the insulating frame in which the electrode connecting the second contact and the third contact is embedded, and the first and second contacts A first disconnecting rod to be inserted, a second disconnecting rod to be inserted into the third and fourth contacts,
And an operation unit provided in front of the insulating frame for individually inserting and removing the first and second disconnecting bars.

According to a second aspect of the present invention, there is provided a disconnector with a grounding device, wherein a first connecting portion for connecting an external conductor on one side is provided at a rear portion of the second contact, and a rear portion of the fourth contact is provided. Is provided with a second connecting portion for connecting the external conductor on the other side.

According to a third aspect of the present invention, in the disconnecting switch with a grounding device, the first contact is connected to the grounding conductor, and the second disconnecting rod is an insulated disconnecting rod having an intermediate portion insulated. It is characterized by.

According to a fourth aspect of the present invention, there is provided a disconnector with a grounding device, wherein the distance between the first disconnecting rod and the second disconnecting rod, the rear end of the first connecting portion, and the front end of the fourth contactor. Is substantially equal to the distance between the third contact and the fourth contact.

According to a fifth aspect of the present invention, there is provided a disconnector with a grounding device, wherein a cylindrical electric field relaxation portion is formed on one side of the electrode and the other side of the electrode, and a cylindrical electric field relaxation section is formed on the rear side of the other side of the insulating frame. The electric field relaxation ring is embedded.

Further, in the disconnector with a grounding device according to the invention of claim 6, the first and second connecting portions are loosely fitted to one side and the other side of the rear end of the insulating frame. It is characterized by having been established.

By such means, in the present invention, the distance between the first and second contacts and the third and fourth contacts is narrowed, and particularly the insertion and removal of the disconnecting rod of the insulating frame accommodating them. Reduce the occupied space viewed from the direction.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the disconnector with a grounding device according to the present invention will be described below with reference to the drawings. FIG. 1 is a partially enlarged longitudinal sectional view showing an embodiment of a disconnector with a grounding device of the present invention, and corresponds to FIG. 4 shown in the prior art, and shows a state in which the disconnector with a grounding device is turned on. It is. FIG.
2A is an enlarged right side view of FIG. 1, and FIG. 2B is an enlarged left side view of FIG.

In FIGS. 1 and 2, the operating mechanism 1 is connected via a flange 1a to a low pressure chamber formed in front of a gas insulated metal closed switchgear (not shown) and a partition 23c separating the gas chamber behind the low pressure chamber. It is installed airtight.

Inside the operating mechanism 1, an operating rod 9 driven by a signal for turning on / off a main circuit connecting a power supply side or a load side to a high-pressure vacuum circuit breaker is driven back and forth as shown by an arrow A1. The main circuit disconnecting drive unit, not shown, and a grounding disconnector drive unit (not shown) for driving a disconnecting rod 7 for turning on / off an upper grounding disconnector described later back and forth as shown by an arrow A2 are housed.

A seal case 1b having a seal inserted therein is hermetically attached to the front surface of the penetrating portion of the operating rod 7 above the flange 1a, as shown by a broken line. A seal case 1b is also attached to a penetrating portion of the insulating operation rod 9 that penetrates a lower portion of the flange 1a as shown by a broken line.

When viewed from the front (not shown), a mounting plate 2 having a pair of upper and lower through holes 2a is formed on the rear surface of the flange 1a. It is fixed via a ring.

On the rear surface of the mounting plate 2, an insulating frame 3 to be described below, which is manufactured by injection molding of epoxy resin, is provided in front of the six embedded metal 3b embedded at the front end of the insulating frame 3. And is fixed to the mounting plate 2 with bolts 3b screwed from above.

The insulating frame 3 has a
As shown by the broken line in FIG. 2B, a U-shaped recess 3h is formed in the front-rear direction. 2 (b), a rectangular concave portion 3g in FIG. 1 is formed below the concave portion 3h. Among them, the upper concave portion 3
The rear part of h is cylindrical.

Further, behind the upper concave portion 3h, in FIG. 2 (a), a convex concave portion 3k is formed on the axis of the concave portion 3h, and behind the lower concave portion 3g, A concave portion 3j1 having a columnar shape and having an open lower end is formed on the axis of the front concave portion 3g, and behind the concave portion 3j1, FIG.
, A substantially Φ-shaped groove 3j2 having an open top and bottom is formed.

Among them, a circular counterbore hole and a circular through hole 3d are formed at the front end of the upper front concave portion 3h as shown in FIG. 2 (b). The front end of a substantially annular contact block 8B through which the disconnecting rod 7 penetrates is fitted into the counterbore, and is fixed to the bottom bolt hole 3n with a bolt inserted from the front. The contact base 8B has a connection terminal portion to which a ground conductor (not shown) is connected.

A plurality of contact pieces 4A are continuously arranged on the outer periphery of the contact base 8B, and a pair of coil springs (not shown in detail) are given predetermined tension to the outer periphery of the contact pieces 4A. Each contact piece 4A is pressed against the contact base 8B and the disconnecting rod 7 with a predetermined contact pressure by the return force of the coil spring.

In the insulating frame 3, an electrode plate 5 made of a copper material and having an upper and lower annular electric field relaxation ring 5a1 is embedded in advance during molding. As shown in FIG. 2A, bolt holes 5p and 5g are formed at the bottoms of the electric field relaxation rings 5a1 and 5a2 of the electrode plate 5, and a substantially disk-shaped contact block is formed in the upper electric field relaxation ring 5a1. 8C is inserted from the front, and a cylindrical contact base 8A is inserted into the lower electric field relaxation ring 5a2 from the rear.

The contact piece 4B of the same product as the above-mentioned contact piece 4A is continuously arranged on the outer periphery in front of the upper contact stand 8C and on the outer periphery behind the lower contact stand 8A. A pair of coil springs are also wound around the outer periphery of these contact pieces 4B.

The rear end of the disconnecting rod 7 in the grounded state is inserted into the upper contact piece 4B, and the insulating disconnecting rod 6 connected to the rear part of the disconnecting rod 9 is inserted into the lower contact piece 4B. The middle part penetrates.

The insulated disconnecting rod 6 is connected to a disconnecting rod 9 via an embedded metal 6b embedded in the front end of an insulating shaft 6a formed at the front end.
Is connected to the rear end.

A concave portion 3h formed at the upper rear of the insulating frame 3
A plurality of contact pieces are vertically opposed to each other, and a contact 10B having a tension spring incorporated in an intermediate portion is loosely fitted.
A protrusion protruding from the rear end of the contact base 8C is inserted into the front end of 10B, and the front end is fixed to this protrusion by bolts.

At the rear end of the contact 10B, the front end of the conductor 11B of the main circuit disposed in the box housing the disconnector with the grounding device is inserted. A conductor 11D indicated by a broken line above the rear part of the contact 10B will be described later.

An electric field mitigating cylinder 3a having the same shape as the electric field mitigating rings 5a1 and 5a2 is also buried at the rear end of the concave portion 3j1 formed in the lower part of the insulating frame 3. It is inserted from the front and is fixed to the bolt hole 5p with a bolt inserted from behind.

A plurality of contact pieces 4B are continuously arranged in front of the outer periphery of the contact base 8D.
A coil spring is also wound around the outer periphery of each contact piece 4B.
Is pressed against the contact base 8D at a predetermined contact pressure.

The front end of the contact 10A is also inserted into the rear end of the contact stand 8D, and the rear end of the contact 10A is provided with a dash-dot line provided in a box housing the disconnector with the grounding device. The front end of the conductor 11A of the main circuit shown in FIG. This conductor 11
A conductor 11C2 indicated by a two-dot chain line in a direction orthogonal to A will be described later together with the conductor 11D described above.

In the disconnector with a grounding device having the above-described structure, when the grounding disconnector is disconnected, the operating mechanism 1
By driving the grounding disconnector drive unit housed in the inside, the disconnecting rod 7 is linearly driven forward as shown by the arrow A2 in FIG. 1 so that the tip of the disconnecting rod 7 is moved from the contact piece 4B. Pull out.

Similarly, when the insulating disconnecting rod 6 connected to the conductor 11A is pulled out and the load side of the disconnecting switch with the grounding device is separated from the power supply side, the main circuit disconnecting switch housed inside the operating mechanism 1 is used. By driving the drive unit to linearly drive the operating rod 9 forward as shown by the arrow A1 in FIG.
Disconnect the main circuit.

In FIG. 1, upper and lower conductors 11A, 11A
The distance G1 between the opposing surfaces of B is made substantially equal to the distance between the electrodes when the insulating disconnecting rod 6 is opened. By setting the intervals to be substantially equal, the conductor 11 shown by the two-dot chain line in FIG.
As shown in C1, 11C2 and 11D, the vertical direction (or
Even when the conductor 11A is connected to the conductor 11A at an angle of 90 ° or less, a predetermined insulating creepage distance and an insulating gap can be obtained.

Accordingly, the upper and lower disconnecting rods and contact pieces can be arranged in parallel and the interval can be narrowed, so that the height of the insulating frame 3 in the vertical direction can be kept low, and the height of the box body can be reduced. Can be reduced.

[0064]

As described above, according to the present invention, the first contact and the second contact facing each other are accommodated in the front part on one side, and the third contact and the fourth contact facing each other are accommodated in the front part. An insulating frame in which the contact is accommodated in the rear part on the other side, an electrode for connecting the second contact and the third contact is embedded, and a first disconnection inserted through the first and second contacts By providing a rod, a second disconnecting rod inserted through the third and fourth contacts, and an operation unit provided in front of the insulating frame and individually inserting and removing the first and second disconnecting rods. , The first
The distance between the second contact and the third and fourth contacts is reduced,
Since the space occupied by the insulating frame containing these components, especially when viewed from the direction of insertion and removal of the disconnecting rod, is reduced, a disconnector with a grounding device that can reduce restrictions on the installation location of the box can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a disconnector with a grounding device of the present invention.

FIG. 2 (a) is an enlarged right side view of the insulating frame of FIG. 1,
FIG. 2B is an enlarged left side view of the insulating frame of FIG. 1.

FIG. 3 is a right side view showing an example of a gas-insulated metal closed switchgear accommodating a conventional disconnector with a grounding device.

FIG. 4 is a right side view showing an example of a conventional disconnector with a grounding device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Operation mechanism, 1a ... Flange, 2 ... Mounting plate, 2a ... Through hole, 3 ... Insulating frame, 3a ... Electric field relaxation cylinder, 3b ... Filling, 3
c, 3d, 3e, 3f through holes, 3g, 3h, 3k recesses, 3j2 grooves, 4A, 4B contact pieces, 5 electrodes, 5
a1, 5a2: electric field relaxation ring, 6: insulating disconnecting rod, 6a
... insulating shaft, 7 ... disconnecting rod, 8A, 8B, 8C, 8D ... contact stand, 9 ... operating rod, 10A, 10B ... contact, 11A, 11
B, 11C, 11D ... conductor.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Ryoichi Kodama, Inventor: 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Plant, Inc. (72) Inventor Tetsuo Yoshida 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu Plant, Toshiba Corporation (72) Inventor Masaru Miyakawa 1-Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu Plant, Toshiba Corporation (72) Inventor Akira Sato Tokyo No. 1, Toshiba-cho, Fuchu-shi, in the Fuchu Plant, Toshiba Corporation (72) Kazuhito Horikiri No. 1, Toshiba-cho, Fuchu-shi, Fuchu-shi, Tokyo Inside the Fuchu Plant, Toshiba Corporation (72) Nobuo Masaki 1-1, Shibaura, Minato-ku, Tokyo No. 1 Toshiba Corporation head office

Claims (6)

[Claims] A first contact and a second contact facing each other are housed in a front part on one side, and a third contact and a fourth contact facing the front and rear are arranged on a rear part on the other side. An insulating frame in which an electrode for housing and connecting the second contact and the third contact is embedded, a first disconnecting rod inserted through the first and second contacts, 3, with a grounding device provided with a second disconnecting rod inserted through the fourth contact, and an operation unit provided in front of the insulating frame and individually inserting and removing the first and second disconnecting rods Disconnector. 2. A second connection for connecting a rear part of the second contact to a first connection part for connecting an external conductor on one side, and a rear part of the fourth contact for connecting an external conductor on the other side. The disconnector with a grounding device according to claim 1, further comprising a portion. 3. The first contact is connected to a ground conductor,
The disconnecting switch with a grounding device according to claim 1 or 2, wherein the second disconnecting rod is an insulating disconnecting rod having an intermediate portion insulated. 4. The distance between the first disconnecting rod and the second disconnecting rod, and the distance between the rear end of the first connecting portion and the front end of the fourth contact are set to the third connecting rod. 2. The distance between the contact and the fourth contact is substantially the same.
The disconnector with a grounding device according to claim 3. 5. The electric field relaxation part having a cylindrical shape formed on one side and the other side of the electrode, and a cylindrical electric field relaxation ring is buried in a rear part of the other side of the insulating frame. The disconnector with a grounding device according to claim 4. 6. The shielding frame according to claim 2, wherein a shielding portion into which the first and second connecting portions are loosely fitted is provided on one side and the other side of a rear end of the insulating frame. The disconnector with the grounding device according to the above.