JP7162165B2 - External grounding terminal structure of gas insulated switchgear - Google Patents

Description

The present invention relates to an external grounding terminal structure for a gas-insulated switchgear installed in a substation or power station.

Substations, power plants, etc., have traditionally been equipped with single-cell capacitors filled with sulfur hexafluoride, which has high insulating properties, such as circuit breakers, disconnectors, bus lines, lightning arresters, instrument transformers, and grounding devices for work. A gas-insulated switchgear housed in a container is sometimes installed (see Patent Document 1). After construction work such as replacement of the overhead transmission line connected to the gas-insulated switchgear, the external grounding terminal of the gas-insulated switchgear is operated to ensure that each phase of the overhead transmission line is connected as planned. Insulation resistance of the overhead power transmission line is measured as well as megger phase detection is performed to see if there is any (see Patent Document 2).

FIG. 3 is a diagram showing an external ground terminal structure of a conventional gas-insulated switchgear 100. As shown in FIG. The external grounding terminal structure of the gas-insulated switchgear 100 shown in FIG. thru|or the 3rd grounding terminal part 102 (insulation terminal part for insulation resistance measurement) are arrange|positioned outside the container 101. As shown in FIG. A ground plate 103 made of copper is fixed to the first to third ground terminal portions 102 with bolts 104 . The first to third ground terminal portions 102 are connected by a ground plate 103, a ground wire mounting portion 105 fixed to the ground plate 103, and a ground wire (not shown) connected to the ground wire mounting portion 105. It is designed to be grounded (earthed) at

The external ground terminal structure of the gas insulated switchgear 100 shown in FIG. After removing the part 105, except for one ground terminal part 102 for megger phase detection, the other two ground terminal parts 102 are grounded via a ground wire (not shown), and one ground terminal part for phase detection is grounded. An insulation resistance meter is connected to the ground terminal portion 102 .

JP 2010-154630 JP-A-58-90181

However, in the external ground terminal structure of the conventional gas-insulated switchgear 100 shown in FIG. The sealing material 106 that prevents leakage of gas (sulfur hexafluoride enclosed in the container 101 of the gas-insulated switchgear 100) from the threaded portion of the gas-insulated switchgear 104 is damaged by repeated attachment and detachment of the bolt 104, and the gas-insulated switchgear 100 is damaged. There is a risk that the gas in the container 101 will leak out.

Therefore, the present invention can prevent the seal material for preventing gas leakage in the gas-insulated switchgear from being damaged by the bolt of the ground terminal portion, and can prevent the gas leakage caused by the damage of the seal material. Provided is an external ground terminal structure for a gas insulated switchgear.

The external grounding terminal structure of the gas-insulated switchgear 1 according to the present invention includes first to third overhead transmission lines provided corresponding to the first to third overhead power lines drawn into the container 4 of the gas-insulated switchgear 1, respectively. A third ground terminal portion 5 is arranged outside the container 4 . In the first to third ground terminal portions 5, the ground plate 3 connecting the first to third ground terminal portions 5 is detachably fixed with a bolt 7, and gas leaks from the threaded portion of the bolt 7. A sealing material 8 is arranged to prevent the above-described grounding and is grounded by the grounding plate 3 and the grounding wire connected to the grounding plate 3 . In the ground plate 3, a ground plate support 6 made of a conductive metal is detachably fixed to the first to third ground terminal portions 5 by fixing means 10. 6 is fixed to the first to third ground terminal portions 5 by the bolts 7, and thus the bolts 7 are fixed to the first to third ground terminal portions 5 via the ground plate support 6. there is

According to the external grounding terminal structure of the gas-insulated switchgear according to the present invention, the grounding plate support is grounded when megger phase detection and insulation resistance measurement of the overhead power transmission line are performed after replacement work of the overhead power transmission line. The grounding plate is separated from each grounding plate support only by removing the fixing means for fixing the grounding plate to the grounding plate support without removing the bolts fixing the terminal portion. Therefore, in the external grounding terminal structure of the gas insulated switchgear according to the present invention, damage to the sealing material caused by attaching and detaching the bolts to and from the first to third grounding terminal portions and damage to the inside of the container caused by damage to the sealing material Gas leakage can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the external grounding terminal structure of the gas insulated switchgear which concerns on the Example of this invention, Fig.1 (a) is a top view of the external grounding terminal structure of a gas insulated switchgear, FIG.1(b) is a gas insulated switchgear. A front view of the external ground terminal structure of the device (a front view showing a part of the container side bolt omitted), FIG. 1(d) is a side view of the gas insulated switchgear showing the ground plate cut along line A2-A2 of FIG. 1(a). It is a side view (side view which abbreviate|omits a part of container side bolt and shows it) of a grounding terminal structure. FIG. 2 is a diagram showing the external grounding terminal structure of the gas-insulated switchgear with the grounding plate and the grounding wire mounting part removed from the grounding plate support shown in FIG. 1, and FIG. A plan view showing the terminal structure, FIG. 2(b) is a front view showing the external grounding terminal structure of the gas-insulated switchgear (a front view showing a part of the container-side bolt omitted), and FIG. It is a side view (the side view which abbreviate|omits a part of container side bolt) which shows the external grounding terminal structure of the gas insulated switchgear seen from the A3 direction of a). 3(a) is a plan view of the external ground terminal structure of the gas-insulated switchgear, and FIG. 3(b) is an external ground terminal structure of the gas-insulated switchgear. Fig. 3(c) is a side view of the external earth terminal structure of the gas-insulated switchgear viewed from direction A4 in Fig. 3(a). (Side view showing container-side bolts partially omitted), FIG. 3(d) shows the external grounding terminal structure of the gas-insulated switchgear by cutting the grounding plate along the line A5-A5 in FIG. 3(a). 2 is a side view (a side view showing a part of the container-side bolt omitted).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an external ground terminal structure of a gas-insulated switchgear 1 according to an embodiment of the present invention. FIG. 1(a) is a plan view showing the external ground terminal structure of the gas-insulated switchgear 1. FIG. FIG. 1(b) is a front view showing the external grounding terminal structure of the gas-insulated switchgear 1 (a front view showing a partially omitted container-side bolt 2). 1(c) is a side view (a side view with the container-side bolt 2 partially omitted) showing the external grounding terminal structure of the gas-insulated switchgear 1 as seen from the direction A1 in FIG. 1(a). be. FIG. 1(d) is a side view of the ground plate 3 cut along the line A2-A2 of FIG. 1(a) (a side view with the container-side bolt 2 partially omitted).

In FIG. 1, a gas insulated switchgear 1 includes a circuit breaker, a disconnecting switch, a bus wire line, a lightning arrester, an instrument transformer, a grounding device for work, etc. (not shown) housed in a container 4, and first to third overhead transmission lines (overhead transmission lines of each phase, not shown) are led into the container 4, and the container 4 is filled with sulfur hexafluoride having high insulating properties. First to third ground terminal portions 5 corresponding to the first to third overhead transmission lines are arranged on the upper exterior of the container 4 . A ground plate support 6 made of a conductive metal plate and formed in a substantially U-shape is fixed to the first to third ground terminal portions 5 by bolts 7 . In addition, a sealing material 8 (for example, an annular packing) that prevents gas (sulfur hexafluoride) from leaking from the threaded portion of the bolt 7 is arranged on the first to third ground terminal portions 5. there is

The ground plate support 6 includes a rectangular lower side portion 6a fixed to the ground terminal portion 5 with a bolt 7, a rectangular leg portion 6b rising from one end of the lower side portion 6a so as to be perpendicular to the lower side portion 6a, A rectangular upper side portion 6c extends parallel to the lower side portion 6a from the upper end of the leg portion 6b. In FIG. 1, the ground plate support 6 has a lower side portion 6a extending forward from the lower end of the leg portion 6b, and an upper side portion 6c extending forward from the upper end of the leg portion 6b.

A ground plate 3 made of a conductive metal (for example, copper) is detachably fixed to the upper side portion 6c of the ground plate support 6 by fixing means (for example, bolts and nuts) 10. As shown in FIG. As a result, the first to third ground plate supports 6 fixed to the first to third ground terminal portions 5 with bolts 7 are connected by one ground plate 3 . Although the fixing means 10 has been exemplified by a bolt and nut, it is not limited to this, and may be a clip that can be attached and detached more efficiently than the bolt and nut.

A ground wire connection shaft 11 made of a conductive metal and extending rearward from the leg portion 6b of the ground plate support 6 is fixed to the leg portion 6b. The ground wire connection shaft 11 has a round rod-shaped shaft portion 11a and a collar portion 11b having a diameter larger than that of the shaft portion 11a. When a ground wire (not shown) is attached to the shaft portion 11a of the ground wire connection shaft 11, the collar portion 11b can prevent the ground wire from falling off from the tip of the shaft portion 11a. It's becoming

A ground wire attachment portion 12 is fixed to the tip of the ground plate 3 projecting from the ground plate support 6 . The ground wire attachment portion 12 has a metal plate 13 fixed to the ground plate 3 and tip ground members 14 fixed to both front and back surfaces of the metal plate 13, respectively. A ground wire is connected to each of the pair of distal end grounding members 14 , 14 .

In the external grounding terminal structure of the gas insulated switchgear 1 shown in FIG. An earth wire (not shown) connected to the earth wire attachment portion 12 is used for grounding.

FIG. 2 is a diagram showing the external grounding terminal structure of the gas-insulated switchgear 1 with the grounding plate 3 and the grounding wire mounting portion 12 removed from the grounding plate support 6 shown in FIG. 2(a) is a plan view showing the structure of the external ground terminal of the gas-insulated switchgear 1. FIG. FIG. 2(b) is a front view (a front view with the container-side bolt 2 partially omitted) showing the external ground terminal structure of the gas-insulated switchgear 1. As shown in FIG. 2(c) is a side view (a side view with the container-side bolt 2 partially omitted) showing the external grounding terminal structure of the gas-insulated switchgear 1 as seen from the direction A3 in FIG. 2(a). be.

(First step)
The external grounding terminal structure of the gas insulated switchgear 1 shown in FIG. The overhead transmission line and the first to third ground terminal portions 5 are cut off. However, an induced voltage may occur in the first to third ground terminal portions 5 . In addition, the induced voltage generated in the first to third ground terminal portions 5 may cause an electric shock to the operator. Therefore, when megger phase detection and measurement of the insulation resistance of the overhead transmission line are carried out after work such as replacement work of the overhead transmission line, the ground wire is connected to the ground wire connection shaft 11 of each of the first to third ground plate supports 6. are connected, and the first to third grounding terminal portions 5 are grounded via the bolt 7, the grounding plate support 6, the grounding wire connecting shaft 11, and the grounding wire. After that, as shown in FIG. 2, the ground plate 3 fixed to each of the first to third ground plate supports 6 by the fixing means 10 and the ground wire attachment portion 12 fixed to the ground plate 3 are fixed. By removing the means 10, it is separated from each ground plane support 6 (see FIG. 2).

(Second step)
Next, for example, when megger phase detection and insulation resistance measurement of an overhead power transmission line corresponding to one of the first ground terminal portions 5 are performed, the first ground terminal portion 5 fixed to the first ground terminal portion 5 The ground wire is removed from the ground wire connection shaft 11 of the ground plate support 6, and the lead wire of the insulation resistor is connected to the ground wire connection shaft 11 of the first ground plate support 6 fixed to the first ground terminal portion 5. It is attached. At this time, the ground wire connection shafts 11, 11 of the ground plate supports 6, 6 at the other two locations are connected to ground wires, and the ground terminal portions 5, 5 at the other two locations are grounded.

Further, for example, when performing megger phase detection and insulation resistance measurement of the second overhead transmission line corresponding to the second ground terminal portion 5, the second ground plate support fixed to the second ground terminal portion 5 The ground wire is removed from the ground wire connection shaft 11 of the body 6 , and the lead wire of the insulation resistor is attached to the ground wire connection shaft 11 of the second ground plate support 6 fixed to the second ground terminal portion 5 . At this time, the ground wire connection shafts 11, 11 of the ground plate supports 6, 6 at the other two locations are connected to ground wires, and the ground terminal portions 5, 5 at the other two locations are grounded.

Further, for example, when performing megger phase detection and insulation resistance measurement of the third overhead transmission line corresponding to the third ground terminal portion 5, the third ground plate support fixed to the third ground terminal portion 5 The ground wire is removed from the ground wire connection shaft 11 of the body 6 , and the lead wire of the insulation resistor is attached to the ground wire connection shaft 11 of the third ground plate support 6 fixed to the third ground terminal portion 5 . At this time, the ground wire connection shafts 11, 11 of the ground plate supports 6, 6 at the other two locations are connected to ground wires, and the ground terminal portions 5, 5 at the other two locations are grounded.

As described above, according to the external grounding terminal structure of the gas insulated switchgear 1 according to the present embodiment, when megger phase detection and insulation resistance measurement of the overhead transmission line are performed after the replacement work of the overhead transmission line. , the grounding plate 3 and the grounding wire can be connected by simply removing the fixing means 10 for fixing the grounding plate 3 to the grounding plate supporter 6 without removing the bolts 7 fixing the grounding plate supporter 6 to the grounding terminal portion 5 . A mounting portion 12 is separated from each ground plane support 6 . Therefore, the external grounding terminal structure of the gas insulated switchgear 1 according to the present embodiment can prevent damage to the sealing member 8 caused by attaching and detaching the bolt 7 to and from the first to third grounding terminal portions 5 and damage to the sealing member 8. It is possible to prevent leakage of gas in the container 4 caused by

Further, in the external grounding terminal structure of the gas insulated switchgear 1 according to the present embodiment, since the grounding wire mounting shaft 11 is fixed to the first to third grounding plate supporters 6, the grounding plate 3 and the grounding wire mounting shaft 11 are fixed. When removing the portion 12, the first to third ground terminal portions 5 to which the first to third ground plate supports 6 are fixed can be grounded simply by connecting the ground wire to the ground wire mounting shaft 11. It is easy to connect the ground wire. In contrast to this embodiment, the external grounding terminal structure of the conventional gas-insulated switchgear 100 is such that the bolt 104 that fixes the grounding plate 103 to the grounding terminal portion 102 is removed from the grounding terminal portion 102, and the grounding plate 103 is grounded. After being removed from the terminal portion 102, the bolt 104 is screwed into the ground terminal portion 102, and the ground wire is fixed to the ground terminal portion 102 with the bolt 104 so that the ground terminal portion 102 is grounded. , the work of connecting the ground wire was troublesome.

Further, in the external grounding terminal structure of the gas-insulated switchgear 1 according to the present embodiment, since the flange portion 11b is provided at the tip of the shaft portion 11a of the ground wire connection shaft 11, the shaft portion 11a of the ground wire connection shaft 11 is It is possible to prevent the ground wire attached to the ground wire from slipping off (falling off) from the tip of the ground wire connection shaft 11, thereby preventing an electric shock accident caused by the falling off of the ground wire.

DESCRIPTION OF SYMBOLS 1...Gas insulated switchgear, 3...Ground plate, 4...Container, 5...Ground terminal portion, 6...Ground plate support, 7...Bolt, 8...Seal material, 10...Fixing means

Claims (3)

first to third ground terminal portions provided corresponding to the first to third overhead power lines drawn into the container of the gas-insulated switchgear, respectively, are arranged outside the container;
In the first to third ground terminal portions, a ground plate connecting the first to third ground terminal portions is detachably fixed with a bolt, and a sealing material for preventing leakage of gas from the threaded portion of the bolt. is arranged and grounded by the grounding plate and a grounding wire connected to the grounding plate,
In the external ground terminal structure of gas insulated switchgear,
In the ground plate, a ground plate support made of a conductive metal is detachably fixed to the first to third ground terminal portions by fixing means, and the ground plate support is attached to the third ground plate by the bolt. By being fixed to the first to third ground terminal portions, the bolts are fixed to the first to third ground terminal portions via the ground plate support,
An external grounding terminal structure for a gas-insulated switchgear, characterized by: The ground plate support is provided with a ground wire connection shaft made of a conductive metal,
The external grounding terminal structure for a gas insulated switchgear according to claim 1, characterized in that: The ground wire connection shaft has a collar portion having a larger diameter than the shaft portion formed at the tip of the shaft portion,
3. The external grounding terminal structure for a gas insulated switchgear according to claim 2, wherein:

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