JP2878739B2 - Collective substation equipment - Google Patents

Description

Description: Object of the Invention (Industrial Application Field) The present invention relates to a special high-voltage power switchgear, a transformer for stepping down from a special high voltage to a high voltage, and a collective substation equipment comprising a high-voltage distribution switchgear. Things.

(Conventional technology) Hereinafter, the conventional technology will be described using an example of a 66 / 77KV class extra high voltage substation facility. 66KV class power receiving equipment
(1) Open / close type (open) power receiving equipment, (2) housing type power receiving equipment, (3) gas insulated power receiving equipment (GIS; Gas Insu)
(related Switchgear) (4) The cubicle type gas insulated switchgear (C-GIS; Cubicle type GIS) has been transformed.

By the way, the above-mentioned open-type power receiving equipment uses air insulation by connecting each electrical device such as a circuit breaker, disconnector, grounding disconnector, instrument transformer, current transformer, and lightning arrester with copper stranded wires and aluminum pipes. Power receiving equipment.

For this reason, the installation space is increased due to the arrangement of the respective electric devices in series, and the charging section is exposed due to the air insulation method, which has a problem in safety.

On the other hand, due to problems such as construction costs, rising land, and contamination of live parts, safety, noise, etc., miniaturization and sealing of power receiving equipment were required, and the above-mentioned gas-insulated power receiving equipment (GIS) was developed. . In this device, each of the above-described electric devices is covered with a pipe-shaped metal container, and is filled with high-pressure SF ₆ gas as an insulating medium, and is miniaturized and hermetically sealed.

In addition, the above-mentioned cubicle type gas-insulated power receiving equipment is more reliable, safer, simplifies maintenance and inspection than the above-mentioned gas-insulated power receiving equipment, and can be constructed on a narrow site in a short period of time. This is a power receiving facility developed to meet the demands of harmonizing with the environment. This is a type of cubicle-type container that uses low-pressure insulating gas near atmospheric pressure, and collectively stores each electrical device and divides the inside of each unit into structural units, and has the same appearance as other closed switchboards. is there.

As described above, 66KV class power receiving equipment is (1) non-container type,
The appearance has been changed between (2) pipe-shaped container type and (3) cubicle container type.

(Problems to be Solved by the Invention) The substation equipment is roughly composed of a special high-voltage receiving switchgear, a transformer, and a high-voltage distribution switchgear, and can function by being electrically connected in series. However, each device has significantly changed its appearance with the progress of technical development.

In particular, the 66KV special high-voltage power switchgear has been changing from non-container type to pipe-shaped container type and cubicle type as described above. However, when the power receiving equipment is configured as a system, conventionally, only three devices are simply electrically connected.

FIG. 5 shows 66 / 6.6KV in the state of the art as an example of this.
FIG. 2 shows a perspective view of a power receiving facility. This power receiving equipment was composed of a 66 KV cubicle type gas insulated switchgear 1, a transformer 2, and a 6.6 KV high-voltage power switchgear 3, and had a distributed arrangement of electrical connection. FIG. 6 shows a plan view of FIG.
The 66 KV cubicle-type gas insulated switchgear 1 and the 6.6 KV high-voltage distribution switchgear 3 were so-called front-rear maintenance cubicles having doors on the front and back. Therefore, in order to maintain and inspect each device, a maintenance and inspection space 4 shown in FIG. 1 is required, and the arrangement must be distributed. This is a disadvantage that limits the reduction of the installation area of the power receiving equipment.

In addition, since the devices are electrically connected to each other due to the distributed arrangement, cable connection work and cable pit construction for housing the cables are required, and there is a drawback that the construction period and construction costs are increased accordingly.

Therefore, an object of the present invention is to provide a collective substation facility capable of reducing the installation area and the on-site construction period.

[Configuration of the invention]

(Means for Solving the Problems) The present invention relates to a collective substation comprising a special high-voltage receiving switchgear, a transformer, and a high-voltage distribution switchgear, wherein the high-voltage distribution switchgear is a front-maintenance type. The special high-voltage receiving switchgear is of a front and side maintenance type. The non-maintenance surfaces of the two switchgears are brought into contact to be physically connected and fixed, and the length between the ends of the contact portions of the two switchgears. And the maintenance surface of the high-voltage distribution switchgear is arranged so as to be on the outer surface of the collective substation equipment, the radiator of the transformer is arranged inside when viewed in a plane, and the primary bushing and the secondary The next bushing is provided in the same direction, and is connected to each main circuit of the special high-voltage power switchgear and the high-voltage distribution switchgear, respectively.

(Operation) By integrating the special high-voltage receiving switchgear and high-voltage distribution switchgear and integrating them with the transformer, the maintenance and inspection space can be reduced, and the radiator of the transformer is arranged inside when viewed in a plane. By doing so, it is possible to reduce the space of the conventional radiator disposed on the outside, thereby significantly reducing the installation area.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
This embodiment is intended for 66 / 6.6KV power receiving equipment.

FIG. 1 is a single-line connection diagram of an embodiment of the present invention, showing a standard connection example of a special high-voltage power receiving facility of a regular spare 2CB power receiving-2 bank primary DS described in Vol. 29, No. 4 of the Electric Cooperative Research, FIG. 2 shows a perspective view of one embodiment of the present invention, and FIG.
1 shows a plan view of a part of an embodiment of the present invention.

1, 2 and 3, the collective power receiving equipment is a cubicle type gas insulated switchgear (C-GIS) 10 as a 66KV power receiving switch, transformers 11A and 11B, and a 6.6KV high voltage power switch. And the device 12.

The cubicle-type gas-insulated switchgear 10 has two power receiving VCB panels 14 arranged separately from each other and an intermediate part between the power receiving VCB panels 14, and a transformer for a measuring instrument for transaction supplied by a power company (PC).
T) A PCT board 15 for connecting 13 and a main variable primary DS board 16 arranged to protrude from one side (upper side in Fig. 3) of each receiving VCB board 14 consists of two faces Have been. In addition, SF ₆ is enclosed in each unit, making it a transport unit. At the installation site, bolts are tightened in the aerial part of each panel and fixed to the row panel. Each panel accommodates the electrical equipment shown in the single-line connection diagram of FIG.

The power receiving VCB panel 14 is provided with a sliding door 14a so that maintenance, inspection, and operation of the circuit breaker 17, disconnecting switch 18, ground disconnecting switch 19, and the like housed therein can be performed. 60-160
A similar example is shown in FIG. A side plate 14b is provided on one side of the power receiving VCB panel 14 except for a contact surface with the main variable primary DS panel 16, and a 66 KV of which is drawn by the power company into the side panel 14b. A work door 14c for connecting the cable 20 to the cable head 21 is provided.

The PCT board 15 has a portion protruding from one side of the power receiving VCB board 14, and a flange 15a is provided at this portion to connect to the PCT 13.

The primary variable primary DS board 16 is provided with a sliding door 16a so that maintenance, inspection and operation of the disconnecting switch 22, the ground disconnecting disconnector 23 and the like can be performed. Further, a side plate 16b is provided on a side surface excluding a surface in contact with the sliding door 16a and the power receiving VCB panel 14.

The row method of each of these panels is the non-maintenance surface 14d of the receiving VCB panel 14.
And the non-maintenance surface 15b of the PCT panel 15 are brought into close contact with each other and connected with bolts (not shown). Non-maintenance surface 14e of receiving VCB panel 14
And the non-maintenance surface 16c of the main variable primary DS board 16 are closely attached to each other back to back, and connected with bolts (not shown). In this case, sliding door
The surfaces of the sliding door 14a and the sliding door 16a are the same. This completes the mechanical connection of the 66 KV power receiving switchgear, but in this state, when viewed on a plane, it becomes a shape like "E" turned sideways, and it becomes a device for side maintenance.

Next, an electrical connection method of the main circuit will be described. A T-shaped bushing known in Japanese Patent Application Laid-Open No. 60-160309 is attached to the ceiling of each panel, and is electrically connected by a cable. That is, a T-shaped bushing 24a for three phases is attached to the power receiving VCB board 14, and a T-shaped bushing 24b for three phases is attached to the PCT board 15, and the two T-shaped bushings 24a, 24b are connected to the cable 25a. Connect with. This allows PCT1
The connection on the primary side of 3 is completed. The PCT panel 15 is provided with two-phase T-shaped bushings 24c, and the primary primary DS board 16 is provided with three-phase T-shaped bushings 24d. The two bushings 24c and 24d are connected to a cable 25b. Connect with. Thereby, two phases of the current element of the PCT 13 are connected. Where PCT
Since the 13 voltage elements only need to be electrically connected,
T-shaped bushing 24a arranged in the middle phase of the power receiving VCB panel 14
From the other side is connected to the primary primary DS board 16 by a cable 25c. Thus, the connection on the secondary side of the PCT 13 is completed.

Thus, the electrical and mechanical connection work of the cubicle type gas insulated switchgear 10 is completed.

The transformers 11A and 11B are filled with an internal insulating medium (SF ₆ gas or insulating oil) to cool the primary and secondary coils housed inside the container. Radiators 26a,
26b is installed. The radiators 26a and 26b have a necessary heat radiation area in order to suppress the temperature of the primary coil and the secondary coil to a predetermined rise. Where the radiator 26
a is attached only to the left side of the transformer 11A in FIG. 2 and FIG. 3, that is, only on the side inside when the transformer 11A is installed, and the radiator 26b is attached to the transformer 11B in FIG. 2 and FIG. , Ie, only on the side that is inside when the transformer 11B is installed. Therefore,
The radiators 26a and 26b are mounted symmetrically.

The space inside the radiators 26a and 26b (the width is indicated by W in FIG. 3) is a space for carrying in the PCT 13. However, this space is a space that is not used until the PCT 13 is replaced after a lapse of 5 to 6 years if the PCT 13 is carried in and connected after installing the 66 / 6.6 KV power receiving equipment.
In other words, the width dimension W only needs to be the minimum dimension for loading the PCT 13, and there is no problem even if the radiators 26a and 26b are extended to that range. Therefore, the portion of the radiator outside the transformer, which had the radiator mounted on both sides in the past,
Even if they are mounted together inside as in this embodiment, sufficient heat radiation capacity can be obtained.

In addition, the 6.6KV distribution switchgear 12
Are two, the bus bar connecting board 28 is one, and the in-house transformer board 29 is one.
And the distribution board 30 is composed of four surfaces. In addition,
The distribution board 30 has a structure in which circuit breakers 31 can be stacked in three stages. Each panel has a well-known structure, and has a front-maintenance structure in which a door 32 is provided on a front surface so that internal inspection / maintenance, breaker operation, and the like can be performed. I have.
Further, these boards are arranged in a row and mechanically connected by bolts (not shown), and electrically connected by buses (not shown) provided on a ceiling portion in the board.

Thus, the electrical and mechanical connection work of the 6.6 KV distribution switchgear 12 is completed.

Next, the connection between the cubicle type gas insulated switchgear 10 and the 6.6 KV distribution switchgear 12 will be described. The front (lower surface in FIG. 3) 33a of the cubicle-type gas insulated switchgear 10 and the back 33b of the 6.6 KV distribution switchgear 12 which are arranged in a row.
Is on the non-maintenance side. The two maintenance surfaces 33a and 33b abut against each other and are connected by bolts (not shown).

As described above, the cubicle type gas insulated switchgear 10 and 6.
The 6KV distribution switchgears 12 are mechanically connected and integrated.

Next, connection of the cubicle-type gas insulated switchgear 10, the 6.6KV distribution switchgear 12, and the transformers 11A and 11B assembled as described above will be described. FIG.
FIG. 2 shows a cross-sectional view taken along line AA of FIG.

First, as for the electrical connection, the primary side of the cubicle type gas insulated switchgear 10 is shown in FIG.
a and the primary transformer primary bushing 34b of the transformer 11A are connected with a slip-on type cable 35, and the secondary side is connected to the center conductor 37 of the main transformer secondary bushing 36 of the transformer 11A.
One end of 38 is fixed with a bolt, and the other end is fixed to the cable connection portion 39 of the 6.6 KV main variable secondary power receiving panel 27 through the lower part of the primary variable primary DS board 16 and the power receiving VCB panel 14 with bolts. The transformer 11B is also electrically connected in a similar configuration.

Also, the mechanical connection part is a primary duct 40a made of a thin steel plate,
Covered with a secondary duct 40b made of a thin steel plate, rubber boots 41a and 41b are attached to prevent transmission of transformer vibration. The transformer 11B side is mechanically connected in a similar configuration.

As described above, the cubicle type gas insulated switchgear 10, 6.
The electrical and mechanical connection between the 6KV distribution switchgear 12 and the transformers 11A and 11B has been completed, and the 66 / 6.6KV power receiving equipment has been integrated.

In the above description, the main circuit of extra high voltage and high voltage has been mainly described. However, the connection of the control cable can also be performed in the cubicle. The main circuit between the transformer and the cubicle-type gas-insulated switchgear and the main circuit between the transformer and the high-voltage distribution switchgear may be provided with pits and buried cables.

〔The invention's effect〕

As described above, according to the present invention, the special high-voltage receiving switchgear, the transformer and the high-voltage distribution switchgear are integrated, so that the maintenance and inspection space is also integrated, and the installation area of the substation equipment is significantly reduced. You.

In addition, the gas insulated switchgear, which is a special high-voltage power switchgear, is filled with insulating gas at the factory, so that gas treatment on site is not required. The high-voltage distribution switchgear can be transported even when two or three surfaces are stacked. By doing so, the work of connecting buses and control lines on the high voltage side after installation at the site can be reduced, and the number of workers and time required for the entire installation can be greatly reduced, so that the construction period that can shorten the local construction period A substation can be provided.

Furthermore, since the radiator of the transformer is installed only inside in the installed state, and the radiator is not installed outside,
Not only the size of the radiator but also a space for flowing the cooling air to the radiator is not required, so that the effect of reducing the installation area is large.

[Brief description of the drawings]

FIG. 1 is a single-line connection diagram showing one embodiment of the present invention, FIG. 2 is a perspective view showing one embodiment of the present invention, and FIG. , FIG. 4 is A- of FIG.
FIG. 5 is a perspective view showing a conventional substation facility, and FIG. 6 is a plan view of the conventional substation facility. 10 …… Cubic type gas insulated switchgear 11A, 11B …… Transformer 12 …… 6.6KV high-voltage distribution switchgear 13 …… PCT 14 …… Received VCB board 15 …… PCT board 16 …… Main primary DS board 26a , 26b …… radiator

Continuing from the front page (72) Inventor Tetsuo Yoshida 1 Toshiba-cho, Fuchu-shi, Tokyo, Japan Inside the Toshiba Fuchu Plant, Inc. References JP-A-54-44739 (JP, A) JP-A-63-81605 (JP, U) JP-A-58-124002 (JP, U) JP-A-56-136405 (JP, U) (58) Field surveyed (Int.Cl. ⁶ , DB name) H02B 7/06 H02B 1/015

Claims (1)

(57) [Claims] 1. In a collective substation comprising a special high-voltage power switchgear, a transformer, and a high-voltage power switchgear, the high-voltage power switchgear is a front-maintenance type, and the special high-voltage power switchgear is a front-side power switch. A side-maintenance type, in which the non-maintenance surfaces of the two opening and closing devices are brought into contact to be physically connected and fixed, and the length between the ends of the contact portions of the two opening and closing devices is made substantially equal; The maintenance surface of the power distribution switchgear is arranged so as to be on the outer surface of the collective substation equipment, the radiator of the transformer is arranged inside when viewed in a plane, and the primary bushing and the secondary bushing are provided in the same direction, A collective substation facility, which is connected to each main circuit of the special high-voltage power switchgear and the high-voltage distribution switchgear, respectively.