JPH07163024A - Extra-high-tension receiving device and its installing method - Google Patents

Abstract

PURPOSE:To obtain an extra-high-tension receiving device, in which a floor space is reduced and the term of work is shortened, and its installing method. CONSTITUTION:A transformer primary switch 13 is parted from a cubicle type gas-insulated switchgear and constituted integrally with a transformer 17, a residual gas insulated switchgear body section is also configured integrally and transported, and cable connecting sections on a site are decreased. A direct- coupled type cable connecting section 8A, a position of which can be adjusted, is mounted on the transformer primary switching unit section 13, the error of the position of installation of the transformer can be absorbed, and the terminals of connecting cables can be treated previously in a factory. When the cables are connected to the transformer primary switch 13 and a gas in the transformer 17 is blown away to the transformer primary switch and the unit section is filled with the gas, gas treating operation on the site can be conducted extremely easily without preparing an article for sealing the gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special high voltage power receiving device comprising a cubicle type gas insulated switchgear and a transformer filled with an insulating medium, and a method for installing the same.

[0002]

2. Description of the Related Art In a 66/77 kV class extra high voltage power receiving device, gas insulating equipment is increasingly used in view of its nonflammability, safety and environmental friendliness. For example, with regard to switchgear, switchgear is required due to demands for downsizing against the backdrop of skyrocketing construction sites and demands for sealing to improve the anti-fouling characteristics of charging parts, safety, and noise. A gas insulated switchgear (GIS), which is housed in a cylindrical metal container and filled with SF ₆ gas, has been introduced. 66/77
In the kV class, the cubicle type gas insulated switchgear (C
-GIS) is becoming mainstream. Further, also in transformers, from the same background, the adoption of gas-insulated transformers containing SF ₆ gas is increasing.

FIG. 5 is a diagram showing the arrangement and main circuit single wire connection of a typical example of a special high voltage power receiving device for receiving power from two systems at 66/77 kV. System 1 power receiving board 1, 2
Power receiving board 2, PCT board 3, primary circuit breaker board 4 for No. 1 transformer
And C-GIS consisting of primary circuit breaker panel 5 for transformer 2
And a gas-insulated or oil-insulated No. 1 transformer 6 and No. 2 transformer 7.

Here, the constituent unit units 1 to 5 of the C-GIS are separated from each other by a metal plate and are gas-separated from the viewpoint of preventing the accident from spreading if an internal accident should occur. In addition, among the constituent unit units 1 to 5, the power receiving board 1
And 2 are respectively a vacuum circuit breaker VCB and a vacuum circuit breaker V
The disconnecting switch DS for disconnecting it from the main circuit when inspecting the CB itself, the instrument transformer PCT for measuring the amount of electric power in the PCT panel 3, and the primary circuit breaker panels 4 and 5
Is a disconnecting switch D for disconnecting the vacuum circuit breaker VCB and the vacuum circuit breaker VCB from the main circuit during inspection.
S is stored. In addition, CT is a current transformer and ES is a grounding disconnector.

In the 66/77 kV class, these storage devices are also large in size, and the outer shape of each of the constituent unit units 1 to 5 constituting the C-GIS has a length of 5.5 m and a width of 3 which is the transport limit of the trailer. It exceeds 0.5m. Therefore, after the completion test in the factory, the 1-system power receiving panel 1 and the primary circuit breaker panel 4 for the No. 1 transformer 2, the 2 system power receiving panel 2 and the primary circuit breaker panel 5 for the No. 2 transformer,
It was general to divide each of the PCT boards 3 into the field and carry them in locally, and combine them as a total of 5 division units of the No. 1 transformer 6 and No. 2 transformer 7 that were carried in separately.

FIG. 6 is a plan view of a device arrangement corresponding to it, and FIG. 7 is a front view taken in the direction of the arrow of FIG. 6, and the numbers in the drawing are shown corresponding to FIG. It is common to connect the C-GIS constituent unit units 1 to 5 and the transformers 6 and 7 to the C-GIS with gas-insulated buses, but this method requires high-level installation. Not only the positional accuracy was required, but on-site gas processing was also required, which required a great deal of time for equipment installation, which was an obstacle to shortening the construction period. Therefore,
As shown in FIGS. 6 and 7, in order to easily perform on-site combination without gas treatment, for example, the ceiling portion of each of the constituent unit units 1 to 5 of the C-GIS is disclosed in, for example, JP-A-60-160309.
The device direct connection type cable connection portion (slip-on type cable direct connection terminal) 8 disclosed in the publication is arranged and connected by the connection cables 9, respectively, and the primary circuit breaker boards 4 and 5 for each transformer and each transformer 6 and 7 and 7, a configuration in which a connection cable 11 is used for connection via a connection bushing (slip-on type cable direct connection terminal) 10 is becoming popular. In addition, 12A is a receiving end lead-in bushing, 12B is a transformer connection bushing.

[0007]

However, the special high-voltage power receiving device having such a structure also has the following problems. (1) Problems related to construction period, cable terminal processing, etc. As described above, the C-GIS and the transformer must be divided into a total of 5 units for transportation from the factory to the site due to the trailer transportation restrictions. , It is necessary to connect 4 places on site, which is an obstacle to shortening the construction period.

[0008] In this regard, Japanese Utility Model Laid-Open No. 54-2603
As disclosed in Japanese Utility Model Publication No. 2 and Japanese Utility Model Application Laid-Open No. 54-26640, the construction period can be shortened by installing the gas insulated switchgear and the transformer on a common base and assembling them in advance integrally. Although considered, however, the 66/77 kV class extra high voltage power receiving device which is the subject of the present invention cannot be adopted because it far exceeds the transport limit of the trailer as described above.

Further, as shown in FIG. 7, the connection cable 11
Construction of a cable pit or cable duct for laying the
Moreover, since it is not possible to determine the cable length in advance and carry out the cable terminal processing at the factory, it is necessary to carry out on-site processing of the cable terminal. (2) Problems such as equipment layout and equipment installation area When inspecting the equipment inside the C-GIS, as shown in Fig. 6, a space for opening the door in front of the equipment and working is necessary. Therefore, a predetermined separation distance "L" is required between the C-GIS and the transformers 6 and 7. Also transformer 6,
Since the connection bushing 10 for pulling in the connection cable 11 is arranged on the 7 side, a projecting portion of the dimension "l" is required on the side surfaces of the transformers 6 and 7, and the installation area becomes large.
This type of extra-high voltage power receiving device is often installed as an indoor facility. In this case, there are restrictions due to the arrangement of columns and walls, and therefore installation may not be possible if the installation area is large.

If the transformer and the C-GIS are arranged in a horizontal row, and if the device direct connection type cable connection portion is also used to connect the transformer primary circuit breaker boards 1 and 2 and the transformers 6 and 7, The separation distance "L" can be reduced. However, since heavy objects such as transformers are installed by roller pulling, the installation position accuracy is poor.Therefore, even if a device direct connection type cable connection part is used, the cable length is determined in advance and the connection cable is terminated. It was not possible to save it, so the construction period could not be shortened.

Therefore, an object of the present invention is to provide a special high-voltage power receiving device and a method of installing the same, which can easily meet various specifications regardless of the place of installation and can reduce the installation area and the construction period. It is in.

[0012]

In order to achieve the above object, the present invention provides a special high-voltage power receiving device comprising a C-GIS and an insulating medium-enclosed transformer, wherein the C-GIS is a circuit breaker and a disconnector or a disconnector. It is divided into a transformer primary switching unit that stores only the transformer and a gas-insulated switchgear main unit, and the transformer primary switching unit and the transformer are placed on a common base, and a bulkhead is sandwiched between them through a through bushing. It has an integrated structure, and a device direct connection type cable connection part (slip-on type cable direct connection terminal) is provided in the transformer primary switching unit part, and the transformer primary switching unit part and gas insulated switching via this device direct connection type cable connection part. It is characterized in that it is connected to the apparatus main body by a connection cable.

In this case, the device direct connection type cable connection portion may be provided on a mounting seat having a structure in which the position can be adjusted in the front-rear direction and the left-right direction. When installing the special high voltage power receiving device of the present invention, when connecting the cable between the transformer primary switching unit and the gas-insulated switchgear main body, only the transformer primary switching unit is opened to the atmosphere, and the device direct connection type cable connection part is connected. Move the mounting seat back and forth, left and right, adjust the position so that the connection cable that has been terminal-processed in advance will be connected, then connect the cables, and then adopt the method of filling the transformer primary switching unit with gas can do.

Further, in the case where the transformer filled with an insulating medium is composed of a gas-insulated transformer, the gas in the gas-insulated transformer is blown into the transformer primary switching unit when the transformer primary switching unit is filled with gas. It is possible to adopt a method of filling by filling.

[0015]

According to the extra high voltage power receiving device and the installation method of the present invention, the transformer primary switching unit is separated from the cubicle type gas insulated switchgear, so that the remaining gas insulated switchgear main body can be integrally transported by the trailer. The dimensions are
In addition, the transformer primary switching unit and the transformer can be integrated into a size that allows trailer transportation. Therefore, in the case of 2 lines,
It is only necessary to combine a total of three division units on site, and it is possible to reduce the number of reconnection points on site (corresponding to six cable connection points) on site. In addition, since the transformer primary opening / closing unit section and the transformer are assembled by sandwiching the partition wall through the through bushing, the effect of preventing accidental transmission is unchanged.

Further, the transformer primary switching unit is provided with a device direct connection type cable connection part for connection with a gas insulation switchgear main body part by a connection cable, and further, this device direct connection type cable connection part is connected to the front and rear, Since it is installed on the mounting seat with a structure that can adjust the position to the left and right to absorb the installation position error of the transformer, the terminal of the connection cable can be processed in advance at the factory, and the construction period at the site can be improved. Can be shortened. In this case, since the transformer primary switching unit part and the transformer unit can be arranged close to the gas-insulated switchgear main body part, the installation area can be reduced.

Further, only the transformer primary opening / closing unit portion is opened to the atmosphere, and the device direct connection type cable connecting portion is position-adjusted by front and rear, left and right position adjusting mounting seats for cable connection, and then the transformer primary opening / closing unit portion. By adopting the method of filling gas to the mounting seat, the mounting seat can have a simple and compact structure. Here, for the primary switching unit of the transformer, by using a vacuum circuit breaker as the circuit breaker, it is only necessary to fill the gas with SF6 gas concentration of 90% or more at a pressure slightly higher than the atmospheric pressure, and to absorb moisture like a transformer. Since no easy material is used, gas filling can be performed very easily by the above method without quality problems.

When the transformer is a gas-insulated transformer, the pressure of the gas enclosed in the transformer is higher than the pressure of the gas enclosed in the transformer primary switching unit. It is possible to employ a method of blowing and filling the primary switching unit of the transformer with the gas, and the on-site gas treatment work can be performed extremely easily without preparing a gas-filled article.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional front view showing an integrated configuration of a transformer primary switching unit and a gas-insulated transformer according to the present invention. Further, FIG. 2 is a diagram showing an arrangement and a main circuit single wire connection when applied to a special high-voltage power receiving device which receives power from two systems at 66/77 kV, and FIG. 3 is a plan view of equipment arrangement corresponding to FIG.
FIG. 4 is a front view of FIG. In the figure, the same parts as those in the conventional example are designated by the same reference numerals.

In FIG. 2, the cubicle type gas-insulated switchgear (C-GIS) is a transformer primary switchgear unit section 13 and 14 containing a circuit breaker and a disconnector or only a disconnector.
It is divided into a gas insulated switchgear main body 16 composed of a PCT board 15, a 1-system power receiving board 1 and a 2-system power receiving board 2. The gas-insulated switchgear body 16 is configured by arranging the PCT board 15 in the center and arranging the 1-system power receiving board 1 and the 2-system power receiving board 2 on both sides thereof. In the PCT panel 15, a transformer for trading instruments PCT supplied from an electric power company, a disconnecting switch DS and a grounding disconnecting switch ES for two banks are collectively housed, and the 1-system power receiving panel 1 and the 2-system power receiving panel 2 are provided. Two disconnectors DS, a vacuum circuit breaker VCB, a current transformer CT, and a grounding disconnector ES are housed. A vacuum circuit breaker VCB and a ground disconnecting switch ES are housed in the transformer primary switching unit sections 13 and 14. As shown in FIG. 1, the primary switching unit 13 or 14 of the transformer has a common base 19 or 2 with the transformer 17 or 18.
0 is placed on.

That is, as shown in FIG. 1, the transformer 17 or 18 is a gas-insulated transformer having a rated gas pressure of 1.25 kg / cm ² (gauge), and 13 or 14 is a rated gas pressure of 0.35.
This is the primary switching unit of the transformer of kg / cm ² (gauge). The transformer 17 or 18 has a projecting portion composed of an expandable bellows-shaped duct 21 and a partition wall 22.
A through bushing 23 is attached to the through hole 2, and a through current transformer BCT is provided around the through bushing 23.
The transformer contents Tr are housed inside the transformer 17 or 18, and the SF _{6 having} a predetermined pressure of 1.25 kg / cm ² (gauge) or more is accommodated inside the transformer 17 or 18 including the above-mentioned protruding portion.
Gas is enclosed.

On the other hand, the transformer primary switching unit section 13 or 14 has a gas chamber section 24 containing a vacuum circuit breaker VCB and a grounding disconnector ES, and a mechanism section 25. A T-shaped device direct connection type cable connection part (slip-on type cable direct connection end) 8A for connecting a cable to the main circuit of the gas-insulated switchgear body 16 and a mounting seat 26 for mounting the same are provided.

Here, the mounting seat 26 is provided with a large hole for fastening a bolt so that the position of the cable connecting portion 8A directly connected to the device can be adjusted to move back and forth and left and right. Bolts are fastened to the ceiling of the chamber 24. A valve 27 for discharging gas is also attached to the ceiling of the gas chamber 24. And transformer 17 or 1
8 and the transformer primary switching unit 13 or 14 are assembled on the common base 19 or 20. here,
The through bushing 23 projects into the transformer primary opening / closing unit portion 13 or 14, and the periphery of the partition wall 22 is bolted to the transformer primary opening / closing unit portion 13 or 14 so that the transformer 17 or 18 and the transformer primary opening / closing unit. The part 13 or 14 is integrated. In order to connect and disconnect between the gas chamber portion 24 of the transformer primary opening / closing unit portion 13 or 14 and the transformer 17 or 18,
A connecting pipe 29 with a connecting valve 28 is provided.

As shown in FIG. 4, the constituent unit units of the PCT board 15, the 1-system power receiving board 1 and the 2-system power receiving board 2 which constitute the gas-insulated switchgear body 16 are also assembled on the common base 32. . Each component unit has a device direct connection type cable connection portion 8 provided on the ceiling,
Connection is made by a connection cable 9 via the device direct connection type cable connection portion 8. These are assembled beforehand at the factory.

The PCT panel 15 and the 1-system power receiving panel 1 which constitute the constituent units of the transformer primary switching unit sections 13 and 14, the transformers 17 and 18, and the gas-insulated switchgear main body section 16.
And each structural unit unit of the 2 system power receiving panel 2 is carried into the installation site in such an assembled state,
Installed in place. Then, as shown in FIG. 3, the transformer primary switching unit parts 13 and 14 are on-site.
The device direct connection type cable connection part 8A of FIG. 1 and the other device direct connection type cable connection part 8 provided on the PCT board 15 are connected, but the dimensions between them are the designed size.
By using the mounting seats of the transformer primary opening / closing unit parts 13 and 14, the position of the device direct connection type cable connection part 8A is moved back and forth and left and right to be adjusted. This work is performed by opening the inside of the transformer primary opening / closing unit portions 13 and 14 to the atmosphere. After the position adjustment, the connection cable 11 which has been subjected to the terminal treatment in advance is laid and the connection work is performed. Then, Figure 1
The discharge valve 27 and the connection valve 28 shown in FIG.
The gas in 7, 18 is changed to the transformer primary switching unit section 13, 1
Blow into 4 and fill up to the specified pressure of 0.35 kg / cm ² (gauge) to complete the installation work.

In the above description, the case where a gas-insulated transformer is applied as the transformers 13 and 14 has been described. However, in the case of an oil-filled transformer, the open valve 27 is a sealed valve, and the transformer primary switching unit portions 13 and 14 are used. After preparing a small amount of gas cylinder corresponding to the volume of the gas chamber section 24 and connecting the cables,
It suffices to blow gas from the gas cylinder into the primary switching unit sections 13 and 14 of the transformer to fill the same, and substantially the same effect as that of the above-described embodiment can be obtained.

Further, when the circuit breaker is not required on the primary side of the transformer, it is possible to house only the disconnecting switch in the transformer primary switching unit parts 13 and 14, and in this case also, exactly the same as the above embodiment. The effect of is obtained.

[0028]

As described above, according to the extra high voltage power receiving device of the first aspect of the present invention, the gas-insulated switchgear main body part, the transformer primary switchgear unit part and the transformer are each integrally formed as a trailer. It fits in transportable dimensions and reduces the number of reconnection points on site.

According to the extra high voltage power receiving device of the second aspect, the device direct connection type cable connecting portion can be provided in the mounting seat having a structure in which the position can be adjusted back and forth and left and right to absorb the installation position error of the transformer. Since it is possible, the terminal of the connection cable can be processed in advance in the factory, and the construction period on site can be shortened. Moreover, since the transformer primary switching unit and the transformer unit can be placed close to the gas-insulated switchgear main unit, the installation area can be reduced and various specifications can be easily applied regardless of the installation location. Can handle.

Further, according to the method for installing the extra-high voltage power receiving device of claim 3, only the transformer primary opening / closing unit is opened to the atmosphere, and after connecting the cable, the transformer primary opening / closing unit is filled with gas. By adopting
Since there is little on-site gas processing work, and because materials that easily absorb moisture such as transformers are not used, the above method
Gas filling can be done very easily without quality problems.

Further, according to the method of installing the extra high voltage power receiving device of the fourth aspect, the gas in the gas insulated transformer is blown into the transformer primary opening / closing unit to fill it, so that a gas filled article is not required. On-site gas processing work can be performed extremely easily.

[Brief description of drawings]

FIG. 1 is a cross-sectional front view of essential parts showing an integrated configuration of a transformer primary switching unit and a transformer according to an embodiment of a special high voltage power receiving device of the present invention.

FIG. 2 is a diagram showing an arrangement and a main circuit single wire connection when the present invention is applied to an extra-high voltage power receiving device when power is received from two systems at 66/77 kV.

FIG. 3 is a plan view of a device layout corresponding to FIG.

FIG. 4 is a front view of FIG.

FIG. 5 is a diagram showing an arrangement and a main circuit single wire connection of a conventional typical example of a special high voltage power receiving device when receiving power from two systems at 66/77 kV.

FIG. 6 is a plan view of a device layout corresponding to FIG.

FIG. 7 is a front view as seen from the arrow of FIG.

[Explanation of symbols]

1, 2 is a power receiving panel, 8, 8A is a device direct connection type cable connection portion, 13 and 14 are transformer primary switching unit portions, and 15 is P
CT board, 16 is a gas-insulated switchgear main body, 17 and 18 are transformers, 19, 20 and 32 are common bases, 22 is a partition wall,
23 is a through bushing, 26 is a mounting seat, 27 is a discharge valve,
28 is a connecting valve, 29 is a connecting pipe, VCB is a circuit breaker, DS is a disconnecting switch, and ES is a grounding disconnecting switch.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location 13/06 Q

Claims (4)

[Claims] 1. A special high voltage power receiving device comprising a cubicle type gas-insulated switchgear and a transformer filled with an insulating medium,
The cubicle type gas insulated switchgear is divided into a transformer primary switchgear unit that houses a disconnector or circuit breaker and a disconnector, and a gas insulated switchgear main unit. And the transformer are placed on a common base, and the bulkhead is sandwiched between them to form an integral structure, and the transformer primary switching unit is provided with a device direct connection type cable connection part, and this device direct connection type cable connection part is provided. A special high-voltage power receiving device characterized in that the gas-insulated switchgear main body part and the transformer primary switchgear unit part are connected via a connection cable. 2. The extra-high voltage power receiving device according to claim 1, wherein the device direct connection type cable connection portion provided in the transformer primary opening / closing unit portion is provided in a mounting seat whose position can be adjusted back and forth and left and right. . 3. When connecting the gas-insulated switchgear main body part and the transformer with an insulating medium enclosed, only the transformer primary switching unit part is opened to the atmosphere, and the mounting seats of the device direct connection type cable connection part are attached to the front, rear, left and right. The method for installing an extra-high voltage power receiving device according to claim 1, wherein after the position is adjusted and the cable is connected, the transformer primary switching unit is filled with gas. 4. The insulating medium-enclosed transformer comprises a gas-insulated transformer, and when the transformer primary switching unit is filled with gas, the gas in the gas-insulated transformer is filled into the transformer primary switching unit. The installation method of the extra-high voltage power receiving device according to claim 3, wherein.