JP3139899B2 - Special high voltage power receiving device and its installation method - Google Patents

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 an insulating medium-enclosed transformer and a method for installing the same.

[0002]

2. Description of the Related Art Gas-insulated equipment has been increasingly used in 66/77 kV-class special high-voltage power receiving apparatuses because of their nonflammability, safety, and environmental friendliness. For example, in the case of switchgear, the demand for downsizing of construction sites or the need for sealing for the purpose of improving the anti-fouling characteristics of the charging section, safety, and noise has been increasing. A gas-insulated switchgear (GIS) that is housed in a cylindrical metal container and filled with SF ₆ gas has appeared. Further 66/77
In the kV class, the cubicle-type gas insulated switchgear (C) has been made more compact by lowering the gas pressure and adopting a rectangular container instead of a cylindrical container.
-GIS) is becoming mainstream. In the transformer, the use of a gas-insulated transformer filled with SF ₆ gas has been increasing from the same background.

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

[0004] Here, the constituent unit units 1 to 5 of the C-GIS are separated from each other by a metal plate and are separated from each other by gas from the viewpoint of preventing an accident from spreading when an internal accident occurs. In addition, among the constituent unit units 1 to 5, the power receiving panel 1
And 2 have a vacuum circuit breaker VCB and a vacuum circuit breaker V, respectively.
A disconnector DS for disconnecting the CB from the main circuit at the time of inspection of the CB itself, an instrument transformer PCT for measuring the electric energy on the PCT panel 3, and primary circuit breaker panels 4 and 5 are further provided.
The vacuum circuit breaker VCB and the disconnecting device D for disconnecting the vacuum circuit breaker VCB from the main circuit when the vacuum circuit breaker VCB itself is inspected.
S is stored. In addition, CT is a current transformer, and ES is a ground disconnector.

[0005] In the 66/77 kV class, these storage devices are also large-sized, 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 are the transport limits of the trailer. .5m. Therefore, after the completion test in the factory, the 1st power receiving board 1 and the primary circuit breaker board 4 for the No. 1 transformer, the 2nd power receiving board 2 and the primary circuit breaker board 5 for the 2nd transformer,
In general, each of the PCT panels 3 was divided and carried into the site, and then combined on site as a total of five divided units of the first transformer 6 and the second transformer 7, which were separately carried.

FIG. 6 is a plan view of a corresponding device arrangement, and FIG. 7 is a front view of FIG. 6 as viewed from the direction of the arrow. The numbers in the figure correspond to those of FIG. Although it is common to connect between each of the structural unit units 1 to 5 of the C-GIS and between each of the transformers 6 and 7 and the C-GIS by a gas-insulated bus, this method requires a high level of installation. Not only is positional accuracy required, but also on-site gas treatment is required, which requires a great deal of time for equipment installation, which has been an obstacle to shortening the construction period. Therefore,
As shown in FIGS. 6 and 7, the ceiling of each of the structural unit units 1 to 5 of the C-GIS is mounted on the ceiling of the C-GIS, for example, so as to facilitate the on-site combination without gas treatment.
No. 8 discloses a device direct connection type cable connection portion (slip-on type cable direct connection terminal) 8 and connects each with a connection cable 9, as well as each primary circuit breaker panels 4 and 5 for transformers and each transformer 6 and 7, for example, 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 widespread. In addition, 12A is a receiving end lead-in bushing, and 12B is a transformer connection bushing.

[0007]

However, the special high-voltage power receiving device configured as described above has the following problems. (1) Problems in construction period, cable terminal treatment, etc. As mentioned above, due to trailer transportation restrictions, C-GIS and transformers must be divided into a total of 5 units when transporting or bringing in from the factory to the site. However, four connections are required on site, which is an obstacle to shortening the construction period.

Regarding this point, Japanese Utility Model Application Laid-Open No. 54-2603
No. 2, JP-A-54-26640 discloses a gas-insulated switchgear and a transformer installed on a common base and assembled in advance to shorten the construction period. It is considered, however, that the 66/77 kV class special high-voltage power receiving device, which is the object of the present invention, far exceeds the trailer transport limit as described above and cannot be adopted.

Further, as shown in FIG.
Construction of cable pits or cable ducts for laying cables is required, and connection cables 11 are long.
In addition, since it is not possible to determine the cable length in advance and perform cable terminal processing at a factory, on-site processing of the cable terminal is also required. (2) Problems such as equipment layout and equipment installation area When inspecting equipment inside the C-GIS, as shown in Fig. 6, a space is needed to open the door in front of the equipment and work. Therefore, a predetermined distance “L” is required between the C-GIS and the transformers 6 and 7. Transformer 6,
Since the connection bushing 10 for drawing in the connection cable 11 is provided on the side 7, a protrusion having a dimension “l” is required on the side surfaces of the transformers 6 and 7, which increases the installation area.
This kind of special high-voltage power receiving device is often installed as indoor equipment. In this case, since there is a restriction due to the arrangement of columns and walls, the installation may not be possible if the installation area is large.

If the transformers and the C-GIS are arranged in a horizontal line, and the primary circuit breaker panels 1 and 2 for the transformers and the transformers 6 and 7 are connected with the equipment direct connection type cable connecting portions, The separation distance “L” can be reduced. However, heavy objects such as transformers have poor installation position accuracy due to installation by roller pulling. 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. The construction period could not be shortened.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a special high-voltage power receiving device and a method of installing the same, which can easily cope with various specifications regardless of the installation location, 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 a transformer filled with an insulating medium, wherein the C-GIS is provided with a circuit breaker and a disconnector or disconnector. Transformer primary switching unit containing only the transformer and the gas insulated switchgear main body are divided, the transformer primary switching unit and the transformer are arranged on a common base, and through the partition bushing through the bushing Integral type structure to be installed, 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 through 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, it is preferable to provide the device direct connection type cable connection portion on a mounting seat having a structure capable of adjusting the position 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 unit, only the transformer primary switching unit is opened to the atmosphere, and the equipment direct connection type cable connection Move the mounting seat back and forth, left and right, adjust the position so that the connection cable that has been pre-processed is suitable, connect the cable, and then fill the transformer primary switching unit with gas. can do.

Further, in the case where the insulating-medium-filled transformer is constituted by a gas-insulated transformer, the gas in the gas-insulated transformer is blown off to the primary-opening / closing unit of the transformer when filling the gas into the primary-opening / closing unit of the transformer. A filling method can be adopted.

[0015]

According to the special high-voltage power receiving device and the installation method of the present invention, the primary switching unit of the transformer is separated from the cubicle type gas insulated switchgear, so that the remaining gas insulated switchgear main unit can be transported as a trailer integrally. Dimensions
Moreover, the transformer primary open / close unit and the transformer are integrated into a size that can be transported by trailer. Therefore, in the case of two systems,
It is sufficient to combine a total of three divided units on site, and the number of reconnection sites on site can be reduced by one (corresponding to six cable connection parts). Since the primary opening / closing unit of the transformer and the transformer are connected to each other via the through bushing with the partition wall interposed therebetween, the effect of preventing the accident from spreading is unchanged.

The transformer primary switching unit is provided with an equipment direct connection type cable connection for connection with a gas insulated switchgear main body by a connection cable. It is provided on a mounting seat with a structure that can be adjusted to the left and right, so that errors in the installation position of the transformer can be absorbed, so the connection cable terminals can be processed at the factory in advance. It can be shortened. In this case, since the transformer primary switching unit and the transformer unit can be arranged close to the gas-insulated switchgear main body, the installation area can be reduced.

Further, only the transformer primary switching unit is opened to the atmosphere, and the equipment-directly connected cable connection is adjusted by a mounting seat capable of adjusting the position in the front-rear and left-right directions, and then the cable is connected. The mounting seat can be simple and compact by adopting the gas filling method. Here, for the transformer primary opening / closing unit, a vacuum circuit breaker is used as a circuit breaker so that gas can be sealed at a SF6 gas concentration of 90% or more and a pressure slightly higher than the atmospheric pressure, and moisture can be absorbed like a transformer. Since a material that is easy to use is not used, gas can be filled extremely easily by the above method without quality problems.

In the case where the transformer is constituted by a gas-insulated transformer, the pressure of the gas sealed in the transformer is higher than that of the primary switching unit of the transformer. Can be adopted by blowing into the primary opening and closing unit of the transformer, and the on-site gas processing operation can be performed extremely easily without preparing gas-filled articles.

[0019]

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

In FIG. 2, a cubicle type gas insulated switchgear (C-GIS) includes primary and secondary transformer switchgear units 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 panel 1 and a 2-system power receiving panel 2. The gas insulated switchgear main body 16 has a PCT panel 15 disposed in the center, and a first-system power receiving panel 1 and a second-system power receiving panel 2 arranged on both sides thereof. The PCT panel 15 collectively houses the transaction instrument transformer PCT, which is provided by the power company, the disconnector DS and the ground disconnector ES for two banks, and the 1-system power receiving panel 1 and the 2-system power receiving panel 2 , Two disconnectors DS, a vacuum circuit breaker VCB, a current transformer CT, and a ground disconnector ES. The transformer primary switching units 13 and 14 accommodate a vacuum circuit breaker VCB and a grounding disconnector ES. As shown in FIG. 1, the transformer primary switching unit 13 or 14 is connected to the transformer 17 or 18 and the common base 19 or 2.
0.

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 kg / cm ² (gauge).
This is the primary opening / closing unit of the transformer for kg / cm ² (gauge). The transformer 17 or 18 has a projecting portion including a telescopic bellows-like duct 21 and a partition wall 22.
2, a through current transformer BCT is provided around the through bushing 23.
The transformer Tr is housed inside the transformer 17 or 18, and SF _{6 having} a predetermined pressure of 1.25 kg / cm ² (gauge) or more is contained inside these transformers including the above-mentioned protrusions.
Gas is enclosed.

On the other hand, the transformer primary opening / closing unit 13 or 14 has a gas chamber 24 containing a vacuum circuit breaker VCB and a grounding disconnector ES and a mechanism 25. The ceiling of the gas chamber 24 has A T-shaped device direct connection type cable connection portion (slip-on type cable direct connection terminal) 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 bolt fastening hole so that the position of the device direct connection type cable connection portion 8A can be moved and adjusted forward, backward, left and right, and the gas is supplied through a gasket. It is bolted to the ceiling of the chamber 24. A gas discharge valve 27 is also attached to the ceiling of the gas chamber 24. And the transformer 17 or 1
8 and the transformer primary switching unit 13 or 14 are assembled on a common base 19 or 20. here,
The through bushing 23 protrudes into the transformer primary opening / closing unit 13 or 14, and the periphery of the partition wall 22 is bolted to the transformer primary opening / closing unit 13 or 14, thereby forming 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 24 of the transformer primary opening / closing unit 13 or 14 and the transformer 17 or 18,
A connection pipe 29 with a connection valve 28 is provided.

As shown in FIG. 4, each of the unit units of the PCT panel 15, the 1st power receiving panel 1 and the 2nd power receiving panel 2 constituting the gas insulated switchgear main body 16 is also assembled on the common base 32. . Each structural unit unit is provided with a device direct connection type cable connection portion 8 on the ceiling portion,
The connection is made by a connection cable 9 via the device direct connection type cable connection section 8. These assemblies are performed at the factory in advance.

The PCT board 15 and the 1-system power receiving board 1 which constitute the transformer primary switching units 13 and 14, the component units of the transformers 17 and 18, and the gas-insulated switchgear main body 16.
And each component unit of the 2 system power receiving panel 2 is carried to the installation site in such an assembled state,
Installed in place. Then, as shown in FIG.
Is connected to the device-directed cable connection portion 8A of the PCT panel 15 and the device-directly connected cable connection portion 8 provided on the PCT panel 15, so that the size between the two is the designed size.
Using the mounting seats of the transformer primary open / close unit units 13 and 14, the position of the device direct connection type cable connection unit 8A is adjusted by moving back and forth, left and right. This operation is performed by opening the interior of the transformer primary switching units 13 and 14 to the atmosphere. After the position adjustment, the connection cable 11 that has been subjected to the terminal treatment is laid in advance to perform the connection operation. Then, FIG.
By operating the discharge valve 27 and the connection valve 28 shown in FIG.
The gas in the units 7 and 18 is transferred to the primary switching unit 13 and 1 of the transformer.
4 and filled up to a specified pressure of 0.35 kg / cm ² (gauge) to complete the installation work.

In the above, the case where gas-insulated transformers are applied as the transformers 13 and 14 has been described. In the case of an oil-filled transformer, the opening valve 27 is a sealed valve and the transformer primary opening / closing unit sections 13 and 14 are used. After preparing a small amount of gas cylinder corresponding to the volume of the gas chamber part 24 and connecting the cable,
It suffices to fill the transformer primary opening / closing units 13 and 14 by blowing gas from a gas cylinder, and substantially the same effects as in the above embodiment can be obtained.

When a circuit breaker is not required on the primary side of the transformer, only the disconnecting switch can be accommodated in the transformer primary open / close unit sections 13 and 14, and in this case, the same as in the above embodiment. The operation and effect of the invention can be obtained.

[0028]

As described above, according to the special high-voltage power receiving device according to the first aspect of the present invention, the gas-insulated switchgear main unit, the transformer primary switchgear unit, and the transformer are integrally formed in the trailer. It fits in a size that can be transported, and the number of reconnection points on site can be reduced.

According to the special high-voltage power receiving device of the second aspect, the device direct connection type cable connection portion is provided on the mounting seat having a structure capable of adjusting the position in the front, rear, left and right directions, thereby absorbing the installation position error of the transformer. Since the terminal can be connected, the terminal of the connection cable can be preliminarily processed at the factory, and the construction period on site can be shortened. Moreover, since the transformer primary switching unit and the transformer unit can be arranged close to the gas insulated switchgear main unit, the installation area can be reduced, and regardless of the installation location, it can be easily adapted to various specifications. Can respond.

According to a third aspect of the present invention, there is provided a method for charging the transformer primary switching unit after opening only the transformer primary switching unit to the atmosphere, connecting the cable, and then filling the transformer primary switching unit with the gas. By adopting,
The on-site gas treatment work is small, and materials that are easily absorbed by moisture such as transformers are not used.
Gas filling is very easy without quality problems.

According to the method for installing a special high-voltage power receiving device according to the fourth aspect, the gas in the gas-insulated transformer is blown and filled into the primary switching unit of the transformer, so that there is no need to prepare gas-filled articles. On-site gas processing can be performed extremely easily.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view of a main part 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 according to the present invention.

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

FIG. 3 is a plan view of a device arrangement corresponding to FIG. 2;

FIG. 4 is a front view of FIG. 3;

FIG. 5 is a diagram showing the arrangement and main circuit single-line connection of a conventional representative 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 the device arrangement corresponding to FIG. 5;

FIG. 7 is a front view of FIG.

[Explanation of symbols]

1 and 2 are power receiving boards, 8 and 8A are equipment direct connection type cable connection parts, 13 and 14 are transformer primary switching unit parts, 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,
23 is a through bushing, 26 is a mounting seat, 27 is a discharge valve,
Reference numeral 28 denotes a connection valve, 29 denotes a connection pipe, VCB denotes a circuit breaker, DS denotes a disconnector, and ES denotes a ground disconnector.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-38319 (JP, A) JP-A-1-186107 (JP, A) JP-A-60-160309 (JP, A) 26032 (JP, U) Japanese Utility Model Showa 54-26640 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02B 13/02-13/075

Claims (4)

(57) [Claims] 1. A special high-voltage power receiving device comprising a cubicle-type gas-insulated switchgear and an insulating medium-enclosed transformer,
The cubicle type gas insulated switchgear is divided into a disconnector or circuit breaker and a transformer primary switchgear unit housing the disconnector and a gas insulated switchgear body, and the transformer primary switchgear unit and the insulating medium enclosing transformer are separated. The transformer and the transformer primary open / close unit are provided with a device direct connection type cable connection portion, and the device direct connection type cable connection portion is provided on the common base. A special high-voltage power receiving device, wherein the gas-insulated switchgear main body and the transformer primary switchgear unit are connected by a connection cable via a connection cable. 2. The special 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 on a mounting seat that can be adjusted in front, rear, left and right. . 3. When connecting the cable between the gas-insulated switchgear main unit and the insulating-medium-enclosed transformer, only the primary switchgear unit of the transformer is opened to the atmosphere, and the mounting seats of the device-directly-connected cable connection parts are moved forward, backward, left and right. 2. The method for installing a special high-voltage power receiving device according to claim 1, wherein after the position is adjusted and a cable is connected, the transformer primary switching unit is filled with gas. 4. An insulating-medium-filled transformer is constituted by a gas-insulated transformer, and when filling the gas into the transformer primary switching unit, the gas in the gas-insulating transformer is charged into the transformer primary switching unit. The method for installing a special high-voltage power receiving device according to claim 3, wherein: