JPS5915443B2 - Power distribution equipment using gas-insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the configuration of a power distribution substation, and particularly to unitizing a gas insulated switchgear and a transformer.

Conventional distribution substations were constructed using air-insulated steel structures, but as the demand for electricity increases due to urban congestion, it has become necessary to construct substations in cities, and gas-insulated structures with a small installation area have become necessary. Switchgear is being gradually applied.

FIG. 1 shows a conventional gas insulated switchgear in which a transformer 1 and a gas insulated switchgear 2 directly connected to the transformer are connected by a gas insulated busbar 3 using a phase separation method.

As the capacity of the transformer 1 increases, the dimension 11L'' between adjacent transformers increases, and the length of the interconnecting gas-insulated busbars 4 becomes unnecessary and becomes extremely high in cost. ing.

Moreover, in the installation area, the proportion occupied by the switchgear with the connecting bus 3.4 is often larger than that occupied by the transformer 1.

Even if the phase separation method is changed to a three-phase/vital system, there is no significant difference in the overall installation area because in this configuration, the bus bar is simply used for all three phases.

Figures 2 and 3 show an example of an arrangement in which only gas-insulated switchgear is assembled to compensate for this drawback, and in particular, all three-phase, spoken-type equipment is used to reduce the installation area. Figure 4 shows the connections. Show the diagram.

The lead-in part and the connection to the transformer are made using cables.

That is, in FIGS. 2 to 4, gas circuit breakers 5 having a three-phase configuration are arranged vertically, and from one pole pulled out from above each of these circuit breakers 5, a three-phase-disposable gas insulation The cable is connected to the transformer 1 via the busbar 6 and the cable head 7, and the other pole drawn out from below the breaker 5 is connected to the cable head 9 for the lead-in cable via the gas insulated disconnector 8. This cable pen 9
An earthing switch 10 is provided between the circuit breaker 5 and the disconnector 8, and the circuit breakers 5, 5 on both sides and the center circuit breaker 5 are connected via gas-insulated new circuit switches 11 and 12, respectively.

In this case, the installation space of the substation can be significantly reduced compared to the single-phase configuration shown in FIG. 1, and one drawback can be eliminated.

However, for example, in the scale ton shown in Fig. 4, the disconnector 1
In the event that an accident occurs in step 1, or if you wish to inspect the vehicle,
Because it is directly connected to the gas bus, the transformer 1 on the left side of the diagram
It becomes necessary to stop not only the transformer 1 located in the center but also the transformer 1 located in the center, which may cause problems in system operation.

In addition, in the first period, operation is performed with 1 bank or 2 banks, and when adding banks after that, if you wish to do so without power outage or with only 1 bank stopped, it is necessary to disconnect the disconnector 12 section and a part of the busbar connected to it. Upfront investment will be required.

In addition, when trying to compensate for these drawbacks, it is necessary to increase the number of gas compartments, disconnectors, busbars, etc., which is not only uneconomical, but also incomplete because the structure directly connected by the busbars does not change.

This drawback also applies to the case shown in FIG.

The present invention eliminates the above-mentioned drawbacks, reduces the installation space, and achieves economic efficiency by insulating only the parts that take advantage of the characteristics of gas-insulated equipment, and also provides a substation equipment unit that can be handled in units of transformer banks. It is on offer.

In order to achieve this objective, in the present invention, the gas insulated switchgear is directly connected to the transformer, a switching unit is configured for each bank, and the connection between the banks is made by eliminating the gas insulated bus bar and connecting them with cables. It is an independent unit for gas management purposes.

Embodiments of the present invention will be described in detail below with reference to FIGS. 5 to 7.

FIGS. 5 and 6 show an embodiment in which a gas insulated switchgear is attached to one bank of transformers, and has a three-phase configuration.

A radiator 14 is placed separately on one side of the transformer 13, and a gas insulated switchgear having a three-phase integrated configuration is placed on the opposite side corresponding to the radiator 14.

In this gas insulated switchgear, a vertical three-phase gas breaker 15 is arranged side by side on the side of the transformer 13, and furthermore, it is arranged to the left of the center of the side.

At the top and bottom of this gas breaker 15, connection parts 151.15b for guiding a pair of poles, that is, lead-out terminals, are provided in parallel toward the center of the side surface of the transformer 13. It is connected to a wall bushing 16 drawn out from the top of the transformer 13 via an insulated bus 15C.

The wall bushing 16 is placed in oil on the transformer 13 side, and in insulating gas on the gas breaker 15 side, with the connection part 1 serving as the mounting support part as a boundary.

A pair of gas insulated disconnectors 21 and 17 are arranged in series in parallel with the bus bar 15C at the connecting portion 15b leading to the pole located below the gas breaker 15, that is, the lead-out terminal. Power is connected to other banks via a cable 22 via a cable head 23 provided below, and from the disconnector 17 is connected via a cable 19 via a cable head 18 also provided below.

A grounding switch 20 is provided between the cable head 18 and the disconnector 17.

Each transformer bank 13, 13' is constructed as shown in FIG. 1 by making one unit of the gas insulated switchgear having such a structure correspond to one bank of transformers.

Gas insulated switchgear unit 24゜24' for 13〃
, 24'' can be configured independently for each bank.

That is, the anti-transformer side terminals of each breaker 15°15', 15" are connected to the breaker 17 and 21, and 21" and 17", respectively.
”, cable heads 18 and 2 via 21' and 17'.
3.23” and 18”.

23' and 18','.

The gas insulated switchgear has three switching units as shown by the two-dot chain lines in the figure, and each switching unit extends up to the cable head.

Cables 22.22' between cable heads 23.23" and 1 B" and 23' of each opening/closing unit.
connected with.

With such a configuration, even if an accident occurs in the disconnector 211, for example, only the transformer 13'' will be stopped by opening the disconnectors 21 and 17''.

Furthermore, by using the cables 22, 22', the configuration of each transformer and switching unit can be made as shown in FIG.

In other words, if a gas insulated bus bar is used instead of a cable as in the past, the result will be as shown in Figure 1, and the
It is not possible to take the configuration shown in the figure.

Furthermore, since the number of disconnectors is increased by two compared to the example shown in FIG. 1, the configuration becomes even more complicated.

Normally, a power distribution substation is composed of transformers and switchgear, and the main equipment is the transformer.

However, in the past, a large proportion of the installation space, installation, and maintenance/inspection labor was required for the switchgear, which was a protective device.

As explained above, the present invention provides two disconnectors and two cable heads between each circuit breaker, and connects the cable heads with cables, which reduces the installation area, and makes it easier to handle the switchgear using a transformer. You can think of it as an accessory part of the device.

■It can be handled in units of banks, and since they are connected by cables, the gas management section is completely independent.Therefore, there is no pre-assembled equipment for expansion, and no upfront investment is required.■Easy to expand.■ For example, in the event that an accident occurs at the disconnector 21 or 21', the scope of the accident will be limited and recovery and inspection can be done by simply stopping the maximum l bank. ■Safety and easy maintenance because no live parts are exposed.・The range of standardized dishes is wide, and it is easy to apply.

It has the following advantages. Further, a connecting gas insulated bus bar as shown in FIG. 1 is not required, which is economically advantageous.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of the configuration of a power distribution device using a conventional gas-insulated switchgear, Fig. 2 is a plan view showing another conventional example similar to the above, and Fig. 3 is a side view of Fig. 2. 4 is a connection diagram corresponding to FIGS. 2 and 3, FIG. 5 is a plan view showing an embodiment of the power distribution array using the gas insulated switchgear according to the present invention, and FIG. 6 is a side view thereof. , FIG. 7 is a connection diagram thereof. Explanation of symbols, 13...Transformer, 15...
・Disconnector, 17, 21...Disconnector, 18.2
1... Cable head.

Claims (1)

[Claims] In a system having 13 distribution transformers and a gas-insulated switchgear having three circuit breakers each having one end connected to each distribution transformer, the other end of each of the circuit breakers is connected to a disconnector. The gas insulated switchgear is characterized in that each of the gas insulated switchgear has two cable heads connected through the cable, and the cable heads are electrically connected in series between the cable heads except for two of the cable heads. Power distribution equipment.