JPH01186107A - Connecting device for gas-insulated electrical machinery and apparatus - Google Patents

Abstract

PURPOSE:To shorten time necessary for an installation at the site and one for recovery from accidents and to facilitate the detection of gas leakage by mounting a predetermined bellows type gas bus between the insulation spacer of a gas-insulated transformer and a gas-insulated switchgear. CONSTITUTION:This device is composed by mounting a bellows type gas bus 22 which has a central conductor in an interior that both ends are divided by an insulation spacer 11 of a gas insulated transformer 9 and other gas zone spacer between the spacer 11 and a gas-insulated switchgear 13. A bus 12 of the side of the device 13 and conductors 23 connected to leads 10 from the transformer 9 are provided together with insulation gas in the bellows of the bus 22. A gas pressure detector 24 is mounted at the bus 22 so that its pressure G2 becomes, when there is a difference between the pressure G1 of the side of the device 13 and a pressure G3 in the transformer 9, its intermediate pressure or its one side pressure.

Description

Detailed Description of the Invention [Purpose of the Invention (Industrial Application Field) The present invention uses an insulating gas such as SF gas as an insulating medium, and is similar to the nine gas insulated transformers. The present invention relates to a connecting device for gas insulated electrical equipment that uses gas as an insulating medium and has a modified connection structure with a gas-insulated Jll switchgear connected to the gas insulated transformer.

(Conventional technology) In recent years, the demand for electricity has been increasing more and more, and on the other hand, substations where transformers are installed are required to be more compact due to land acquisition requirements, and underground substations are being constructed. There are also cases where this is the case. Such substations are equipped with gas-insulated electrical equipment such as gas-insulated transformers and gas-insulated switchgears that use an inert insulating gas such as SF-gas as an insulating medium instead of conventional air-submerged or oil-submerged insulation. will be installed. By using an insulating gas as an insulating medium in this way, the size of the device can be reduced considerably, and there is no fear of fire or the like in the event of an accident, which is preferable from the standpoint of disaster prevention.

FIG. 2 shows an example of an aerial substation equipped with a conventional gas insulated switchgear and gas insulated transformer. In the figure, 1 is the lashing connected to the power transmission line, PTJ, disconnector 3
, a gas insulated switchgear 13 consisting of a lightning arrester 4, a Cr2, 6, an interrupter 7, a grounding device 8, etc., and a gas insulated transformer 9.
is connected. Therefore, the insulating spacer 11 also supports and fixes the bus bar 12 on the gas insulated switchgear side.

(Problems to be Solved by the Invention) The connection configuration between the gas insulated switchgear 13 and the gas insulated transformer 9 in the conventional substation configured as described above has the following problems.

(1) Gas insulated transformer 9 or gas insulated switchgear 1
Gas insulated switchgear 1 at the special site where the accident occurred.
3 and the gas insulated transformer 9 must be separated and disassembled, since the insulating gas of the gas insulated switchgear 13 and the gas insulated transformer 9 are separated only by 111 insulating spacers,
The insulating gas from both the gas insulated switchgear 13 and the gas insulated transformer 9 must be recovered, which requires a lot of time for restoration work.

(2) The problem in item (1) above is the same during on-site installation.However, after installing the gas insulated transformer 9, the gas insulated switchgear 13 is installed, but at the time of installation, the gas insulated transformer 9 side Since the presence of high pressure gas in the
The internal Ijk and fs must also be kept at low pressure,
Gas processing time and on-site installation time will be longer.

(3) If the sealing pressures of the gas insulated switchgear 13 and the gas insulated transformer 9 are different, for example, if the insulating spacer 11 is damaged, the insulating gas with higher pressure will move and the gas insulated switchgear 13 or There is a possibility that the tank of the gas insulated transformer 9 may be damaged, which may result in a serious disaster.

(4) If the insulating spacer 11 is damaged and the pressure of the insulating gas is higher in the gas insulated switchgear 13 than in the gas insulated transformer 9, the decomposition gas generated in the interrupter i will be transferred to the gas insulated transformer 9. There is a risk that the insulation inside the tank 7 will be contaminated by the decomposed gas.

(5) As is generally known, internal losses occur in transformers,
It becomes high temperature. On the other hand, gas-insulated switchgear does not reach high temperatures because the loss is only in the conductor. As a result, the tank of a gas insulated transformer contracts depending on the magnitude of the load, but since it is fixed on the gas insulated switchgear side, excessive force is applied to the tank of the gas insulated transformer, causing thermal fatigue.

(6) In the case of on-site installation of gas-insulated switchgear and gas-insulated transformer, if the height of the busbar of the gas-insulated switchgear and the lead-out position of the gas-insulated transformer are misaligned, the pedestal 13 of the gas-insulated transformer, Alternatively, the pedestal on the side of the gas insulated switchgear must be reworked and a weir installed, which is very wasteful.

(7) As mentioned above, the gas pressures of the gas insulated switchgear and the gas insulated transformer are different. In this case, since the internal volume of both devices is large, if gas leaks from the insulating spacer 11, for example, the sensitivity of gas leak detection becomes poor.

The present invention eliminates the above-mentioned various drawbacks, shortens on-site installation and recovery time in the event of an accident, facilitates gas leak detection, and reduces damage to other equipment in the event of an insulating spacer accident. The object of the present invention is to provide a connection device for gas-insulated electrical equipment that can absorb dimensional errors even during on-site installation.

[Structure of the invention] (Means and effects for solving the problem) In the present invention, an insulating spacer is attached to the gas insulated transformer between the attached gas insulated transformer and the gas insulated switchgear. A gas busbar with a bellows structure is provided on the side opposite to the insulated spacer, on the side of the gas insulated switchgear, and the gas insulated switchgear is connected to the gas insulated transformer through this. This is how it was done. A gas pressure detector is attached to the gas bus line.

(Example) Embodiment 1 of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, parts that are the same as those in the prior art are denoted by the same reference numerals, and detailed explanation thereof will be omitted. In FIG. 1, reference numeral 21 denotes a spacer 9 attached to the gas insulated switchgear 13 side. It is attached to the end of 22.

Needless to say, inside the bellows of the gas bus 22, there is an insulating gas as well as a conductor 23 connected to the bus 12 on the gas insulated switchgear 13 side and the lead wire 10 from the transformer.

A gas pressure detector 24 is installed on the gas bus bar 22 of the Perot board.
is installed, and if there is a difference between the pressure G1 on the gas switchgear 13 side and the pressure G3 inside the transformer, the pressure G1 is the intermediate pressure or the pressure of one of the devices.

In the present invention configured as described above, the following actions and effects occur.

(1) Unfortunately, the gas insulated switchgear 1
Even if an accident occurs within the gas insulated transformer 19, the gas from only one side where the accident occurred can be recovered, repaired, and restored, so that the restoration time can be shortened.

(2) Also, in on-site assembly, after insulating either the gas insulated switchgear 13 or the gas insulated transformer 9, install the gas motherboard 1823 on the back panel, lower the pressure there, Since the work can be performed by combining the remaining parts, all gas processing times can be carried out in series, and the on-site installation time can be shortened.

(3) If the sealing pressures of the gas insulated switchgear 13 and the gas insulated transformer 9 are different, and either the insulating spacer 1] or 12 is unfortunately damaged, the remaining spacer will be of the gas compartment type. Therefore, the gas only needs to move up to the Perot type gas motherboard !I22, and there is no worry that it will flow into the gas insulated switchgear 13 or the gas insulated transformer 9 side, which not only prevents damage to the tank but also prevents it from being destroyed. The decomposed gas will not flow into other equipment and will not contaminate other equipment with the decomposed gas.Therefore, secondary destruction of other equipment can be prevented.

(4) If the gas insulated transformer is not at high temperature, the busbar 1
Even if contraction occurs on the second side, the gas busbar 22 is Perot m, so
Since all the shrinkage is absorbed there, the gas insulated bus 1
Unreasonable force is not applied to the second side, increasing reliability.

(5) When installing the gas insulated switchgear 13 and the gas insulated transformer 9, even if the positions are shifted in the height direction and the lateral direction, the intermediate tank is the gas bus bar 22 of the Perot board, so there will be no misalignment. This eliminates the need for secondary processing of the pedestal, making on-site installation easier and reducing work time.

(6) Even if the insulating gas leaks from the gas insulated switchgear 13 or the gas insulated transformer 9 through the spacer 11, the pressure of the gas base @ 22 of the Perot board with a small internal capacity will be applied to the gas insulated switchgear 13 or Since the pressure is intermediate between the pressure inside the gas insulated transformer 9, by detecting the pressure of the Perot gas bus 22, the pressure is applied to either the spacer on the gas insulated switchgear 13 side or the gas insulated transformer 9 side. Even if the gas is leaking, it can be easily detected, and even a small amount of leakage can be detected quickly.

(7) In addition, the action and effect of paragraph (6) apply to the gas bus line 22.
Although the pressure inside the gas insulated switchgear 13 and the gas insulated transformer 9 is set to an intermediate pressure, the same effect can be obtained even if the pressure inside the gas bus bar 22 is made the same as the pressure of either one.

(8) In the case of adding a gas insulated switchgear 13 or a gas insulated transformer 9', change the gas bus bar 22 to a T-shaped bus bar, and install the gas insulated switchgear or gas insulated transformer to be added beyond that. All you have to do is connect it, and you can easily and quickly respond to expansions.

(9) Furthermore, in the case of earthquakes, etc., the presence of Perot's gas base @ 22 in the gas insulated transformer 9 and gas insulated switchgear 13 makes it possible to distinguish vibrations caused by earthquakes, improving vibration resistance. do.

[Effects of the Invention] As described above, according to the present invention, the insulating spacer of the gas insulated transformer and the gas insulated switchgear are separated at both ends by the insulating spacer of the gas insulated transformer and another gas division spacer. Since the gas bus bar of the Perot board, which has a center conductor inside, is installed, the on-site installation and recovery time in the event of an accident are shortened, gas leaks are easily detected, and other equipment can be removed in the event of an accident with the insulating spacer. It is possible to obtain a connection device for gas-insulated electrical equipment that can suppress damage caused to the equipment and absorb dimensional errors in mounting even during on-site installation.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a front view showing a state of connection between a conventional gas insulated switchgear and a gas insulated transformer. 1... Lashing, 2... PT, j... Disconnector,
4... Lightning arrester, 5, 6... CT, 2... Interrupter, 8... Earthing device, 9... Gas insulated transformer, 10...
...Lead wire, 11...Insulating spacer, 12...Bus bar, 13...Gas insulated switchgear, 21...Insulating spacer, 22...Perot shop gas bus bar, 23...Bus bar,
24...Pressure detector. Representative Patent Attorney Suzue Takehiko Figure 1

Claims (1)

[Claims] In a connection device for gas insulated electrical equipment, which connects a lead wire of a gas insulated transformer filled with insulating gas as an insulating medium to a gas insulated switchgear via an insulating spacer, the insulating spacer of the gas insulated transformer and the gas insulated switchgear are connected to each other via an insulating spacer. Connection of gas-insulated electrical equipment, characterized in that a bellows-type gas busbar having a center conductor inside is attached at both ends to the equipment, separated by an insulating spacer of the gas-insulated transformer and another gas division spacer. Device.