JPS6311844B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gas insulated switchgear used in a substation, and more particularly to a gas insulated switchgear connected to a power transmission line in a separated phase arrangement.

[Conventional technology]

In recent years, many gas-insulated switchgears using SF ₆ have been used to make substations smaller and more compact.
However, when ultra-super high voltage or ultra-ultra high voltage (hereinafter abbreviated as UHV) occurs, the busbars become extremely long, resulting in high costs, and one of the challenges is to shorten the length of the busbars.

Figures 1 and 2 are for ultra-super high voltage and UHV
This is a single-phase wiring diagram that is mainly used in

Figure 1 shows two disconnectors 6,
7, and between the disconnectors 6 and 7 there is a disconnector 4.
One end of the is connected. The other end of the shield disconnector 4 is connected to the bushing 2 via the disconnector 11, and the external terminal of the bushing 2 is connected to the power transmission line. Also 2
Two disconnectors 6', 7' are connected between the heavy buses 8, 9, and one end of a sheath disconnector 4' is connected between them. The other end of the cable disconnector 4' is connected to the cable head 10.
It is connected to the.

On the other hand, in Fig. 2, three disconnectors 4 each having a disconnector at both ends are connected in series, and two
This is a system in which it is connected to the heavy bus lines 8 and 9, and power is sent and received from each side and between the disconnectors.

FIG. 3 is a plan view of a conventional gas insulated switchgear corresponding to FIG. 1.

The steel tower 1 that holds the power transmission line and the gas-insulated main busbars 8 and 9 are almost parallel to each other.
The three phases are arranged on a line perpendicular to both of them, and are arranged in parallel at a predetermined air insulation distance in the axial direction of the gas-insulated main busbars 8 and 9. In other words, between the shields and disconnectors 4 of each phase, _the necessary air insulation distance l ₁ must be secured between the external terminals of the bushings 2, and the gas The axial lengths of the insulated main busbars 8 and 9 are increased. At 500 kV, 32 m (l ₂ ) is required per circuit, and for four circuits, a gas-insulated main bus bar with an axial length of 128 m is required.

One of the reasons for the increase in the axial length of the gas-insulated main buses 8 and 9 is that because three-phase equipment is arranged side by side as a set, equipment of the other phase is placed between equipment A and B of the same phase. It is conceivable that a wasted part is required to position the .

[Problem that the invention seeks to solve]

In this conventional arrangement, the U, V, and W phase circuit breakers are mainly arranged adjacent to each other, so the busbars placed parallel to them are The U-phase had no choice but to be installed between the V and W-phase shields and disconnectors, resulting in wasted parts. Therefore, when equipment is assembled for each phase, the length of the U-phase busbar is determined by the U-phase equipment arrangement, and the length of the busbar is approximately 1/3 of the conventional busbar length. but,
In this separated phase arrangement, when a power transmission line is drawn from a steel tower to a substation lead-in tower and connected to a gas-insulated switchgear, when the power transmission line is tied horizontally as in the conventional method, mutual Transmission lines were intersecting and it was impossible to pull in the power lines.

On the other hand, using a three-phase all-in-one gas-insulated switchgear,
It has also been proposed that each phase of the transmission line be arranged vertically on the steel tower, and then be connected to bushings for each phase established at predetermined intervals on a three-phase gas-insulated main bus, but gas-insulated The main bus becomes longer and difficult to manufacture, and as the number of lines increases, the overall structure of each part becomes larger.

The purpose of the gas-insulated switchgear of the present invention is to install a detention tower for each phase, arrange the gas-insulated switchgear for each phase, and further locate all equipment in order from the gas-insulated main bus to the detention tower side. The purpose is to enable connection to power transmission lines without any problems without increasing the area.

[Means for solving problems]

In the present invention, when three phases of gas-insulated switchgear are installed and the power transmission lines leading to the detention tower are connected to the bushings of each phase, the detention towers are set higher in order from the lead-in side of the power transmission line for each phase. The power transmission lines of each phase are secured with an insulation distance in the vertical direction, and the gas-insulated switchgear of each phase connected to each power transmission line is installed on the lead-in side of the power transmission line of each detention tower. At the same time, equipment such as shingle switches and bushings are placed in order from the gas-insulated main bus on the lead-in side of the power transmission line to the detention tower side, and these multiple circuits are placed side by side in the axial direction of the gas-insulated main bus. This is what I did.

[Effect]

In this way, a gas-insulated switchgear is constructed by arranging multiple circuits of each device side-by-side in order from the gas-insulated main bus to the detention tower side, and these are connected to each other in order so that the lead-in direction of the power transmission line and the gas-insulated main bus are perpendicular to each other. Since the phases are installed separately and the detention tower is installed near each bushing, there is no need to increase the air insulation distance of the bushings or the dimensions of the gas-insulated main bus, and the installation area at the substation can be increased. You can configure it without having to do anything.

〔Example〕

In the gas insulated switchgear of the present invention shown in FIG. 4, the gas insulated main busbars 8 and 9 of the conventional example shown in FIG. It is installed parallel to the detention tower on the lead-in side of the electric wire. And the U phase main bus lines 8U, 9
Similarly, U-phase devices of each line are connected to U. That is, the shield disconnectors 6U, 6V, 6W of each phase corresponding to the shield disconnector 4 in FIG. are double gas insulated main busbars 8U, 9U and 8V, 9V and 8W, 9 of each phase, respectively.
W and the same parts as the disconnectors 6 and 7 in Figure 3 (not shown)
By using it, you can connect and configure. Also the third
Gas insulated busbar 1 in place of cable head 10 in the figure
3, and is directly connected to the transformer 14U, and the transformer is also arranged for each phase. The reduction in the axial length of the gas-insulated main busbar can be seen from a comparison with Fig. 3. In FIG. 3, when at least two lines are connected, the distance between adjacent bushings 3 of the same phase is _l1 , which is about four times the distance between devices A and B. On the other hand, in Fig. 4, the insulation distance between the lines, for example, the
Equipment A, which corresponds to the air insulation distance l ₁ in the figure,
Only the distance between B is required, and the axial length of the gas-insulated main bus bar can be reduced to about 1/4. This is because there are no devices of other phases between adjacent devices of the same phase. Also,
Since devices such as shingles and disconnectors are not placed on both sides of the double bus bar as in the conventional case, the installation area can be reduced to less than half even if the three phases are arranged separately as described above. In particular, in the example shown in Figure 4, the transformer side feeder unit is located between the bushings connected to the power transmission line, and the bush tie unit is located, and all equipment is located on one side of the gas-insulated main buses 8U and 9U. The area in the opposite direction does not become large, and the air insulation distance between the external terminals of the bushing can be effectively utilized.

FIG. 5 shows the power transmission line lead-in. As can be seen from FIG. 4, detention towers 1U, 1V, and 1W for each phase are constructed in the vicinity of each phase. Each of these detention towers is arranged in line with the direction in which the power transmission line is drawn in, that is, the power line is drawn in in a direction almost perpendicular to the gas-insulated main bus, and each of the power transmission lines of each phase is placed in the same direction as the lead-in direction from the lead-in side. The height is gradually increased. Therefore, the power transmission lines 15U, 15V, and 15W held by each holding tower are provided with an insulation distance in the height direction. Considering that three phases of power transmission lines are vertically supported by transmission towers, the power transmission line lead-in shown in FIG. 5 is quite convenient.

Incidentally, the transformer may be connected with a cable as in the conventional case.

〔Effect of the invention〕

As described above, the present invention is capable of installing a detention tower for each phase, securing a power transmission line, installing a gas-insulated switchgear for each phase on the transmission line lead-in side of each detention tower, and furthermore, By arranging multiple circuits side by side, we placed equipment such as wire breakers and bushings in order from the gas-insulated main bus bar to the detention tower side. Since the arrangement is easy, the installation area of the gas insulated switchgear in the substation can be reduced, and the space below each detention tower can also be effectively utilized.

[Brief explanation of the drawing]

Figures 1 and 2 are generally known wiring diagrams,
3 is a plan view showing a conventional gas insulated switchgear corresponding to FIG. 1, FIG. 4 is a plan view of a gas insulated switchgear according to an embodiment of the present invention, and FIG. 5 is a side view of FIG. 4. It is. 1U, 1V, 1W...Call tower, 2U, 2V,
2W...Bushing, 6U, 6V, 6W...Shiya breaker, 8U, 8V, 8W, 9U, 9V, 9W...
Gas insulated main bus, 15U, 15V, 15W...power transmission line.

Claims (1)

[Claims] 1. A detention tower is provided to hold down multiple power transmission lines drawn from the tower, and is installed parallel to the detention tower. 2.
A heavy gas insulated main bus, a bow breaker installed perpendicular to both the detention tower and the double gas insulated main bus, and one end of which is connected to the double gas insulated main bus; Three phases of a gas insulated switchgear having a bushing etc. to be connected to the other end are respectively installed in accordance with the power transmission line of multiple circuits, and the power transmission line of each phase of the multiple circuits is connected to the bushing of the corresponding phase, respectively. In the above-mentioned device, the detention tower is installed in order of height from the lead-in side of the power transmission line for each phase,
A plurality of power transmission lines are tied to each of the above-mentioned detention towers with insulation distances secured in the vertical direction, and the gas-insulated switchgear of each phase connected to each of the above-mentioned power transmission lines is connected to the transmission lines of each detention tower. The double gas insulated main bus bar is installed parallel to the detention tower starting from the wire lead-in side, and equipment such as wire breakers and bushings are located.
A gas insulated switchgear characterized in that the plurality of line segments are arranged in parallel in the axial direction of a double gas insulated main bus bar.