JPH1175309A - Disconnecting device of lightning arrester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate connection and disconnection of lightning arrester, reduce airtight parts and improve reliability. SOLUTION: A lightning arrester 26 disposed in a vertical direction of each phase of three phases is supported by a rotating shaft 23 provided in a gas insulating switchgear 2, a movable contact element 27 is provided on the top end of each lighting rod 26, a swinging lever 28 is fixed to a derivation unit 24 from the gas insulating switchgear 2 of the rotating shaft 23, a swinging lever 33 is provided on a control box 29 on the front side of the gas insulating switchgear 2, both levers 28 and 33 are connected by a connecting rod 34, the rotating shaft is rotated by means of the swinging lever 28 subsequent to the swinging lever 33, each lightning arrester 26 is positioned above the rotating shaft by the rotation of the rotating shaft, and thus each lightning arrester 26 is made to contact and leave each fixed contact element 22 connected to a main circuit 8 of each phase of the three phases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disconnecting device for a lightning arrester installed in a gas insulated switchgear for electric power.

[0002]

2. Description of the Related Art A conventional lightning arrester disconnecting device is shown in FIGS.
Will be described. In FIG. 8A (right side), 1 is a base, 2 is a gas insulated switchgear (hereinafter referred to as GIS) installed on the base 1, and an insulating gas such as SF ₆ gas is sealed inside. Reference numeral 3 denotes a box body covering the GIS 2, 4 denotes a lower space behind the GIS 2, 5 denotes a plate of the GIS 2 above the space 4, and 6 denotes a through-hole provided at the front of the plate 5.
The cable head of each phase, 7 is an underground power cable detachably connected to each cable head 6, 8 is a main circuit of each phase in the GIS 2 connected to the cable head 6, and 9 is each phase. The fixed contacts 10 connected to the main circuit 8 are current transformers provided on the power cable 7.

[0003] Reference numeral 11 denotes a jack provided in the space 4 below the plate body 5, reference numeral 12 denotes a handle detachably connected to the jack 11, reference numeral 13 denotes an upper mounting plate of the jack 11, and reference numeral 14 denotes a grounded phase. The lightning arrester in the up and down direction is fixed to the mounting plate 13 at the lower end, penetrates the plate body 5, and the upper end is GI
It is located in S2. Reference numeral 15 denotes a movable contact provided at the upper end of each lightning arrester 14, and is located below each fixed contact 9. Reference numeral 16 denotes a door of the box 3.

The penetrating portion of the plate 5 of the lightning arrester 14
As shown in FIG. 8B, the lightning arrester 14 penetrates an O-ring 18 fitted in an annular groove on the peripheral surface of the through hole 17 of the plate body 5.

Next, the stationary contact 9 and the movable contact 15
As shown in FIG. 9, the tips of a plurality of contact pieces of the fixed contact 9 are wound by a pressure spring 19, each contact piece is pressed inward, and the fixed contact 9 is The rod-shaped movable contact 15 is covered by the shield 21.

When the lightning arresters 14 are switched from the disconnected state to the connected state, the handle 12 connected to the jack 11 is rotated on the rear side of the GIS 2, and each lightning arrester 14 is moved upward via the jack 11 and the mounting plate 13. Then, as shown in FIG. 9B, each movable contact 15 is brought into contact with each fixed contact 9. At this time, the fixed contact 9 is pressed against the movable contact 15 by the pressurizing spring 19, and the conduction of the two contacts 9 and 15 is stabilized.

When disconnecting the lightning arrester 14 from the main circuit 8 at the time of the withstand voltage test of the GIS 2 and the failure of the lightning arrester 14, for example, the handle 12 is rotated in reverse, each lightning arrester 14 is moved down, and each movable contact 15 is moved. Separate from each fixed contact 9.

[0008]

In the case of the above-mentioned conventional apparatus, the jack 11 is used when connecting and disconnecting the lightning arrester 14, so that the operability is poor.

Further, the surge arresters 14 for each phase are G
Since it penetrates the IS5 plate 5, there is a problem that there are many airtight locations.

Further, the operation of the circuit breaker, disconnecting switch, earthing switch, and the like, which are the components of the GIS 2, is on the front side of the GIS 2, and the operation of the lightning arrester 14 is on the rear side of the GIS 2, so that the above devices and the lightning arrester 14 There is a problem that the operation position is different before and after, and the operation is difficult.

In addition, since the contact portion with the O-ring 18 in the connection state of the lightning arrester 14 penetrating the plate 5 is exposed outside the GIS 2 in the disconnected state, a tool or the like hits the contact portion, and the contact portion is exposed. There is a problem that damage may occur, the gas leaks in the connected state, and the reliability decreases.

The present invention has been made in consideration of the above points, and does not use a jack when connecting and disconnecting a lightning arrester to improve operability.
Moreover, the operation can be facilitated by enabling the operation from the front side of the gas insulated switchgear, and further, the number of hermetic parts is reduced,
Furthermore, an object of the present invention is to provide a lightning arrester disconnecting device that prevents gas leakage and improves reliability.

[0013]

In order to solve the above-mentioned problems, a lightning arrester disconnecting device according to the present invention comprises a rotating shaft provided in a gas insulated switchgear, and a rotating shaft disposed above the rotating shaft.
A fixed contact connected to the main circuit of each phase, a vertical lightning arrester for each phase supported by the rotating shaft, and a movable contact of the lightning arrester provided at the upper end of each lightning arrester. A lead-out portion of the rotary shaft that is hermetically derived from the gas-insulated switchgear, and a rotation lever fixed to the lead-out portion,

A control box on the front side of the gas insulated switchgear, an operation lever provided on the control box, the operation lever and the rotation lever are connected, and the rotation of the operation lever is controlled by the rotation lever. And a connecting rod for transmitting rotation of the rotating shaft via the rotating shaft, and the movable contact is brought into contact with and separated from the fixed contact by the rotation of the rotating shaft.

Therefore, the three-phase lightning arresters of each phase are supported on the rotating shaft provided in the gas insulated switchgear, and a movable contact is provided at the upper end of each lightning arrester. The rotation lever is fixed to the lead-out part of the gas-insulated switchgear, and a control lever for rotation is provided on the control box on the front side of the gas insulated switchgear. By rotating the shaft, the respective movable contacts of each lightning arrester are brought into contact with and separated from the respective fixed contacts connected to the main circuit of each of the three phases by rotating the shaft. The lightning arrester connection and disconnection,
It can be done by operating lever without using jack,
Operability can be improved.

In addition, the position where the operation lever is operated is on the front side of the gas insulated switchgear, which is the same position as the operation performed on the front side of the components of the gas insulated switchgear, so that the operation is easy.

Further, since the hermetically sealed portion is only the lead-out portion of the rotating shaft, the number of hermetically sealed portions can be reduced.

In addition, the entire lightning arrester is located in the gas-insulated switchgear, and the contact portion of the lightning arrester that penetrates the gas-insulated switchgear with the O-ring is not exposed from the gas-insulated switchgear, as in the prior art. Prevent gas leakage due to damage to exposed parts,
Reliability can be improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. In those figures, the same reference numerals as those in FIG. 8 indicate the same or corresponding elements. First, FIG. 1 (front), FIG. 2 (right side), and FIG. 3 (plane) will be described. Reference numeral 22 denotes a fixed contact connected to the main circuit 8 of each phase of the GIS 2, and is located at an upper part in the GIS 2.
Reference numeral 23 denotes a left-right rotation shaft provided below the fixed contact 22. Reference numeral 24 denotes a lead-out portion of the rotation shaft 23, which is drawn through a side wall of the GIS 2 and is a space 25 between the GIS 2 and the box body 3. It is located in. Reference numeral 26 denotes an up-and-down arrester for each of the three phases, the lower end of which is supported by the rotating shaft 23.
6 are located entirely within GIS2. 27 is an arrester 26
A movable contact 28 provided at the upper end of the rotary lever is fixed to the lead-out portion 24 and is a rotary lever that rotates in the front-rear direction.

Reference numeral 29 denotes a control box provided on the front side of the GIS 2 via a partition 30, reference numeral 31 denotes a front door of the control box 29,
Reference numeral 32 denotes an operation shaft rotatably provided on a side plate of the control box 29, and reference numeral 33 denotes an operation lever fixed to the operation shaft 32.
Rotate back and forth. 34 is a connecting rod, which is a partition 30
, And connects the intermediate portion of the operation lever 33 to the tip of the rotation lever 28, and transmits the forward / backward movement of the operation lever 33 to the rotation of the rotation shaft 23 via the rotation lever 28.

The lead-out portion 24 of the rotating shaft 23 is
A, as shown in FIG.
It extends through the ring 37.

As shown in FIG. 4B, one piece of a support plate 39 having an L-shaped cross section is
The mounting plate 41 at the lower end of each lightning arrester 26 is attached to the other piece of the support plate 39 by bolts 42 and nuts 43, and each lightning arrester 26 is grounded to the outside of the GIS 2 by a ground wire 44.

Next, the fixed contact 22 and the movable contact 27
Will be described in detail with reference to FIGS. 45 is a vertically elongated locking body of the fixed contact 22, 46 is a shield extending on both sides from the base side of the locking body 45, and 47 is formed by bending inward at the tip of both shields 46. Locking portions, 48 are insertion holes formed between the locking portions 47, 49 are two contact pieces, both ends of which are the side surface of the tip of the locking body 45 and the inner surface of the locking portion 47. Is in contact with Reference numeral 50 denotes two pressure springs, which are provided between the inner surfaces of the shields 46 and the contact pieces 49 and urge the contact pieces 49 inward.

Reference numeral 51 denotes a plate-like contact piece of the movable contact 27,
Reference numeral 2 denotes a shield extending from the base side of the contact piece 51 to both sides. The distal end of the contact piece 51 is inserted into the insertion hole 48 and press-fitted between the two contact pieces 49 of the fixed contact 22 to form a movable contact. The two shields 52 of the contact 27 are the two shields 4 of the fixed contact 22.
6, the movable contact 27 is connected to the fixed contact 22 such that the movable contact 27 can come and go.

Next, in the vicinity of the operation lever 33, FIG.
As shown in (plane), the display 5 with the characters "connection" on the front and "disconnection" on the rear is written on the side plate of the control box 29.
3 is provided, and a pointer 54 projects from the operation lever 33.

Next, the operation of connecting and disconnecting the lightning arrester 26 will be described. In the case where the lightning arrester 26 is switched from the connected state to the disconnected state, when the operation lever 33 is rotated backward,
The rotating shaft 23 is rotated via the connecting rod 34 and the rotating lever 28, and the contact piece 51 of the movable contact 27 of the lightning arrester 26 is replaced with the contact piece 49 of the fixed contact 22, as shown by a chain line in FIG.
From the operating lever 33 as shown in FIG.
4 is located on the side of the “disconnection” of the display 53.

Next, when switching from the disconnected state to the connected state, when the operation lever 33 is rotated forward, the rotating shaft 23 is rotated, and the contact piece 51 of the movable contact 27 is fixed to the fixed contact 22.
, And the pointer 54 of the operation lever 33 is positioned on the side of the “connection” of the display 53.

At this time, the fixed contact 2
The second contact piece 49 comes into pressure contact with the contact piece 51 of the movable contact 27 to stabilize energization.

As described above, in the case of the above-described embodiment, the position where the operation lever 33 is operated is the front side of the GIS 2,
It is the same position as the operation performed on the front side of the component device of S2,
Operation is easy.

In the case of the above-described embodiment, the indication of "connection" and "disconnection" of the indicator 53 on the side panel of the control box 29 is indicated by the pointer 54 of the operation lever 33, so that the lightning arrester 26 is in the connection position or disconnected. The position can be easily seen from the front side of the GIS 2.

[0031]

Since the present invention is configured as described above, it has the following effects. The lightning arrester disconnecting device of the present invention supports the three-phase vertical arresters 26 of each phase on the rotating shaft 23 provided in the gas insulated switchgear 2, and the movable contact 27 is provided at the upper end of each arrester 26. A rotating lever 28 is fixed to a lead-out portion 24 of the rotating shaft 23 from the gas insulated switchgear 2, and an operation lever 33 for turning is provided in a control box 29 on the front side of the gas insulated switchgear 2. 33 are connected by a connecting rod 34, the rotation of the operation lever 33 rotates the rotation shaft 23 via the rotation lever 28, and the rotation of the rotation shaft 23 rotates each movable contact 27 of each lightning arrester 26. Located above the shaft 23, 3
Since each fixed contact 22 connected to the main circuit 8 of each phase is connected and disconnected, the connection and disconnection of the lightning arrester 26 can be performed by the operation lever 33 without using a jack.
Operability can be improved.

Further, the position where the operation lever 33 is operated is on the front side of the gas insulated switchgear 2, which is the same position as the operation performed on the front side of the components of the gas insulated switchgear 2.
Operation is easy.

Further, the hermetic portion is defined by the lead-out portion 2 of the rotating shaft 23.
Since there are only four airtight portions, the number of hermetic portions can be reduced.

In addition, since the entire lightning arrester 26 is located in the gas-insulated switchgear 2, the contact portion of the lightning arrester 26 that penetrates the gas-insulated switchgear 2 with the O-ring 37 is gas-insulated as in the prior art. It is not exposed from the opening / closing device 2, so that gas leakage due to damage to the exposed portion can be prevented, and reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of one embodiment of the present invention.

FIG. 2 is a cutaway right side view of FIG.

FIG. 3 is a partially cut plan view of FIG. 2;

FIG. 4A is an enlarged right side view of an enlarged cutaway side of the rotary shaft shown in FIG. 2, and FIG. 4B is an enlarged sectional view of the rotary shaft shown in FIG.

FIG. 5 is an enlarged view of a disconnection portion of the lightning arrester of FIG. 2;

FIG. 6 is a sectional plan view of FIG. 5;

FIG. 7 is a cut-away plan view near the operation lever of FIG. 2;

8A is a cut right side view of a conventional example, and FIG. 8B is an enlarged sectional view of a part of A.

9A is an enlarged sectional view of a disconnecting portion of the lightning arrester of FIG. 8A, and FIG.
3 is an enlarged sectional view of a connection state of A. FIG.

[Explanation of symbols]

 2 Gas insulated switchgear 8 Main circuit 22 Fixed contact 23 Rotary shaft 24 Outgoing part 26 Surge arrester 27 Movable contact 28 Rotating lever 29 Control box 33 Operating lever 34 Connecting rod

Claims (1)

[Claims] 1. A rotating shaft provided in a gas insulated switchgear, fixed contacts located above the rotating shaft and connected to main circuits of three phases, respectively, and supported by the rotating shaft. A vertical lightning arrester for each phase, a movable contact of the lightning arrester provided at an upper end of each of the lightning arresters, a derivation part of the rotating shaft air-tightly derived from the gas insulated switchgear, A control lever on the front side of the gas insulated switchgear; an operation lever provided on the control box; connecting the operation lever and the rotation lever to rotate the operation lever; A connection rod for transmitting movement to the rotation of the rotation shaft via the rotation lever, wherein the movable contact is brought into contact with and separated from the fixed contact by the rotation of the rotation shaft. Characteristic lightning arrester disconnecting device.