JPS6127965B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reduced-sized substation in which one end of a gas-insulated switchgear is connected to a power transmission line via a bushing.

Gas-insulated switchgear consists of a current-carrying conductor placed in a closed container filled with an insulating gas such as SF ₆ gas, thereby significantly reducing the insulation distance between earth and phases.

However, when one end of a gas-insulated switchgear is introduced and led out by a bushing, the external terminal of the bushing is exposed to the air, requiring a large insulation distance, which is not compatible with the miniaturization of the gas-insulated switchgear. .

This will be explained with reference to FIGS. 1 and 2.
Power transmission lines 1U, 1V, and 1W are supported by a detention tower 2 in a horizontal line. Since the phases of the power transmission line depend on air insulation, each phase is separated by a predetermined insulation distance. On one side of the detention tower 2, which is the side opposite to the power transmission line, there is a gas insulated busbar 3, which is approximately parallel to the detention tower 2.
4 is placed. Service line and gas insulated busbar 3,
4 are connected by feeder gas insulated switchgears 5U, 5V, and 5W arranged so as to connect these two. The gas insulated switchgear for the feeder has a phase-separated configuration in which three phases are arranged in parallel, and as shown in FIG.
8, 9, a lightning arrester 10, etc., and a bushing 11W is provided at the left end. Bushing 11W
The configuration except for the external terminals is gas insulated.
It is possible to arrange the phase components close to each other, but since the external terminal of the bushing 11W is exposed to the air, the three-phase bushings 11U, 1 as shown in FIG.
Between 1V and 11W, a predetermined air insulation distance is required in addition to the arrangement of the feeder gas insulated switchgear. For this reason, the bushings 11U and 11W located on both outer sides are generally tilted somewhat in opposite directions.

Therefore, the width of the feeder gas insulated switchgear for one set of three phases is almost determined by the air insulation distance between the bushings 11U and 11W, and the distance between the phases can be reduced by adopting the gas insulation method. is not utilized. In other words, the substation has the same area as a structure in which three-phase feeder gas insulated switchgears are separated by a distance necessary for air insulation.

In particular, as shown in Figure 1, when three phases of gas-insulated switchgear for feeders on the power transmission line side and transformer side are placed side by side, or when multi-circuit gas-insulated switchgears are placed side-by-side, the gas insulation of each feeder is Since the switchgear is connected by long gas-insulated busbars 3 and 4, it is uneconomical.

Now, even if a predetermined air insulation distance is required between bushings 11U and 12W of adjacent feeder gas insulated switchgear, bushings 11U and 12W are
If the distance between 11W and 11W can be reduced, the entire substation can be downsized by taking advantage of the gas insulated switchgear's ability to reduce the interphase insulation distance.

The present invention has been made in view of the above points, and an object of the present invention is to provide a substation configuration in which the site area is reduced by reducing the width between the three-phase bushings of at least one set of feeder gas insulated switchgear. It is on offer.

The present invention focuses on the fact that three phases of power transmission lines are lined up in the height direction and enters the substation.
The three-phase power transmission line is distributed over the upper and lower floors of the building. This allows the width in the phase direction to be the air insulation distance between the two phases. Further, in the present invention, bushings for three phases are divided into two and arranged on the left and right sides of the detention tower, that is, on the power transmission line and gas insulated switchgear sides. As a result, the width of the lead-in line can be made the same as that of the lead-in line on the gas-insulated switchgear side as well.

The present invention will be explained below with reference to embodiments shown in the drawings.

As shown in Figure 3, a power transmission line 1 with multiple circuits
Bushing between U, 1V, 1W and feeder gas insulated switchgear 5U, 5V, 5W 11U, 11
The connection at V and 11W is the same as in the conventional case. However, the bushings of each phase 11U, 11V, 11W
is divided into left and right sides of the restraining tower 2, that is, the power transmission line and the gas insulated switchgear side which is the side opposite to the power transmission line. Both outer phase bushings 11U and 11W are arranged on the gas insulated switchgear side of the detention tower 2, and the middle phase bushing 11U is arranged on the power transmission line side of the detention tower 2.

On the other hand, as can be seen from FIG. 4, the power transmission lines 1U, 1V, and 1W are arranged so as to be divided into upper and lower floors of the two-story detention tower 2. The transmission lines 1U and 1W to which the bushings of both outer phases are connected are supported on the upper floor of the detention tower 2 using appropriate insulators, and the transmission line 1V to which the bushings of the middle phase are connected is similarly supported on the upper floor of the detention tower 2. It is supported by. Therefore, the width of one feeder on the power line side is:
The distance is reduced to the air insulation distance required for insulation between two phases.

As shown in FIG. 4, the power transmission lines 1U and 1W are guided to the gas insulated switchgear side using two insulators and connected to bushings 11U and 11W. The power transmission line 1V is suspended from the power transmission line side of the detention tower 2 and connected to the bushing 11V. As can be seen from this explanation, the bushings of each phase are arranged at each vertex of the triangle to ensure the necessary air insulation distance between each phase.

Gas insulated switchgear for each phase feeder 5U, 5
As is clear from the arrangement shown in FIG.
It is connected to the.

Such an arrangement of transmission lines and bushings
It is possible to reduce the interphase insulation distance between the bushings 11U and 11W of both external phases to half that of the conventional one, and the distance between adjacent feeders, that is, the axial length of the gas insulated buses 3 and 4, can be shortened. This effect becomes more pronounced as the number of feeders increases.
Further, the bushings 11U and 11W do not need to be inclined or provide a branch bus bar as in the conventional case, and the bushings and the feeder gas insulated switchgear can be configured almost linearly.

Incidentally, although the above embodiment describes a double bus system, a single bus system may also be used. In addition, the gas insulated switchgear for feeders that has gas shields, disconnectors, and disconnectors may have various configurations in addition to the linear configuration, and the gas insulated switchgear for feeders that does not include bushings can be configured in a three-phase package. It may be a configuration.

Furthermore, in the above embodiment, the two-phase power transmission lines 1U and 1W are supported on the upper floor of the detention tower 2, but the middle-phase power transmission line 1V is supported on the upper floor, and both outer-phase power transmission lines 1 are supported on the lower floor.
You may support U and 1W.

However, in this case, the bushing connected to the power transmission line supported on the upper floor of the detention tower 2 is
It must be placed on the side opposite to the transmission line introduction side. This can be understood by comparing the case where the bushing connected to the power transmission line on the upper floor of the detention tower 2 is arranged on the side of the detention tower 2, which is the power transmission line introduction side. In other words, in the latter case,
The transmission line connected to the middle phase bushing will pass between the transmission lines (including drop-in wires) connected to the bushings of both external phases, and considering the air insulation distance of the three-phase transmission lines, 2 between the corresponding power lines
This is because the air insulation distance between phases is required to be twice as long, and the distance ends up being the same as the conventional method.

In addition, even if the power transmission lines and bushings are arranged to meet the above conditions, two phases of the power transmission lines are connected to the detention tower 2.
When supported on the lower side of the
Since U and 11W must be located in the direction in which the power transmission line is introduced into the detention tower 2, the axial length of the two-phase feeder gas insulated switchgear 5U and 5W becomes large, making it uneconomical. It is preferable to support two-phase power transmission lines on the upper floor of the detention tower 2.

Furthermore, in the present invention, it is not necessary to strictly arrange two sets of bushings on both sides of the detention tower 2, and even if one set is located directly below the detention tower 2, the same effect can be achieved.

As explained above, the present invention divides power transmission lines into two sets and supports them on the upper and lower floors of a detention tower, and also divides the bushings connected to one end of the gas-insulated switchgear for each phase feeder into two sets and supports them on the upper and lower floors of a detention tower. Because they are placed on both sides of the steel tower, the width of a three-phase set of gas-insulated switchgear can be reduced to about half of the conventional width, and the axial length of the gas-insulated busbar can be shortened to reduce the area of the substation.

[Brief explanation of the drawing]

Figures 1 and 2 are a plan view and front view showing the main parts of a conventional compact substation, and Figures 3 and 4 are
The figures are a plan view and a front view showing essential parts of a reduced-sized substation according to an embodiment of the present invention. 1U, 1V, 1W...Power transmission line, 2...Call tower, 3, 4...Gas insulated bus bar, 5U, 5V, 5W
...Gas insulated switchgear for feeder, 11U, 1
1V, 11W... Butsing.

Claims (1)

[Claims] 1. 3 introduced from substantially the same direction on one side of the detention tower
3-phase bushings supporting the phase transmission line and connected to the other ends of the 3-phase feeder gas insulated switchgear disposed on the other side of the detention tower,
In a device in which the external terminals of each bushing are connected to the three-phase power transmission line, the detention tower is two-story, and the three-phase power transmission line is connected to the
Two phases connected to both outer phases of the bushing and one phase connected to the middle phase of the bushing are supported on the upper floor and lower floor of the detention tower, respectively,
A bushing connected to the power transmission line supported on the upper floor of the detention tower is placed near the power transmission line on the opposite side to the introduction side of the power transmission line, and is supported on the lower floor of the detention tower. A reduced-sized substation characterized in that the bushing connected to the electric wire is placed near the above-mentioned detention tower on the introduction side of the power transmission line. 2. A reduced-sized substation according to claim 1, wherein a two-phase power transmission line connected to the bushings of both external phases is supported on the upper floor of the detention tower. 3 In claim 1 above, the above 3
Multiple sets of power transmission lines for one phase are provided, and the feeder gas insulated switchgear corresponding to each phase power transmission line is arranged with the side opposite to the connection side to the power transmission line substantially parallel to the detention tower. A compact substation connected by gas-insulated busbars. 4 In the above claim 1, the above 3
The gas-insulated switchgear for the phase feeder is a phase-separated structure, and is installed in a compact substation parallel to the above-mentioned detention tower.