JP2011234511A - Power generating/transforming equipment - Google Patents

Abstract

【Task】
Improving the cooling efficiency of substation equipment in the substation equipment configured to transmit the power generated by the power generation equipment mounted on the floating platform to the substation equipment and substation equipment installed on the ground via underwater cables. In addition, the substation equipment is made compact to provide a compact substation equipment as a whole.
[Solution]
The power generation facility 1 is mounted on the floating platform 6, and the output power of the power generation facility 1 is sent to the gas-insulated transformer 31 installed underwater with the underwater cable 4. 5 is transmitted.
[Selection] Figure 1

Description

  Embodiments of the present invention relate to a power generation / transformation facility configured by immersing a transformer device such as a transformer or a switch in water. For example, the power generated by a power generation facility installed on a water platform is installed in water. The present invention relates to a power generating / transforming facility that transmits power to a substation facility installed on the ground via a substation device.

  In recent years, in offshore oil and gas fields, an offshore platform equipped with power generation facilities and substation facilities has been installed adjacent to the excavation site, and the power generated here is converted into high voltage advantageous for long-distance transmission, Power is transmitted to the land using submarine cables.

  In addition, wind power generation is currently attracting attention as a means for obtaining clean energy, and offshore wind power generation is also being studied.

  FIG. 3 shows a conventional power generating / transforming facility that transmits power by connecting an offshore power generation facility and a land substation facility.

  In FIG. 3, the power generation facility 1 and the oil-filled transformer 30 are installed on the offshore platform 6. The electric power generated by the power generation facility 1 passes through the connection conductor 2 such as a cable or an insulated bus, and is sent to the substation facility 30 of the offshore platform 6. The electric power is boosted to a high voltage that is advantageous for long-distance transmission by the substation facility 30, and is sent to the substation facility 5 on the ground 9 through the submarine cable 4.

  Power generation facilities using oil and natural gas as fuel, and transformers for boosting the power to high voltage are both large in mass and volume, so the offshore platform on which these facilities are placed becomes a huge structure.

  Furthermore, since these facilities are used under severe conditions exposed to rain, wind, and waves, it is necessary to take a large safety factor in terms of the structural strength of the platform 6.

  Therefore, in consideration of the construction cost of the power generating / transforming equipment including the auxiliary equipment such as the platform 6, it is desirable to reduce the weight of the equipment mounted on the platform 6 as much as possible.

JP-A-3-150813

  The power generation and substation equipment as described above has the following problems.

  That is, in the substation facility 30 shown in FIG. 3, oil-filled equipment is generally used as a static induction device such as a transformer. For example, thermal expansion due to temperature change of the insulating oil 301 in the tank of the oil-filled transformer A conservator 302 is attached to the upper part of the main body tank 32 for absorption.

  The conservator 302 is connected to the tank 32 via the pipe 36, and the insulating oil 301 thermally expanded by the heat generated from the transformer body 33 flows into the conservator 302, and the outside air passes through the rubber bag in the conservator 302. Contact with. This is because when the insulating oil 301 directly contacts the atmosphere, moisture in the air is absorbed and the dielectric strength of the insulating oil 301 is reduced.

For this reason, the outside air taken into the conservator 302 is introduced by removing moisture through a desiccant such as silica gel.

  As described above, the oil-filled transformer is vulnerable to moisture and cannot be used underwater due to the structure using the conservator 302. Therefore, a heavy oil-filled transformer is installed on the offshore platform 6 even at offshore substations. There was no choice but to install it.

  Japanese Patent Laid-Open No. 3-150813 discloses that a transformer tank is installed in an underground hole so that a part of the transformer tank is immersed in water during overload operation of the transformer. A transformer that increases the amount of heat dissipation and improves the cooling efficiency during overload operation is described.

In the underground distribution transformer described in the present invention, the cooling air stagnate in the basement, and the cooling efficiency of the transformer is poor, so there is a problem that the equipment becomes large, during overload operation In order to share the load, a large-capacity transformer was required, but by injecting water into the underground hole where the transformer was installed, it was possible to improve cooling efficiency and make the transformer compact. To do.

  However, since the transformer described in Patent Document 1 is basically installed on land, when trying to install it on the sea floor where the water depth is several tens of meters, the entire transformer is not installed in the pressure vessel due to pressure resistance. There was a problem that the equipment would need to be housed inside and the equipment would become larger as a whole.

In order to solve the above-described problems, the present invention provides a compact power generating / transforming equipment as a whole, with a configuration in which a part of the power transformation equipment installed on the water platform can be installed on the seabed or lake bottom. The purpose is to do.

  In order to solve the above problems, in the present invention, the power generation equipment placed on the water platform, the substation equipment installed in the water, and the substation equipment installed on the ground are connected by an underwater cable. In the power generation and transformation facility, a gas-insulated static induction device is provided as a transformation device installed in water.

  As a substation device installed in water as in the present invention, by applying a gas-insulated static induction appliance, the tank that houses the static induction appliance main body has a structure in which a high-pressure insulating gas is enclosed. This eliminates the need for a conservator used in oil-filled transformers, etc., and allows the static induction electric device body to be installed in water under water pressure.

  Therefore, by replacing the substation equipment that has been installed and used on the water platform up to now with a gas-insulated static induction machine and installing it in the water, the water platform can withstand the space and weight of only the power generation equipment. Should be designed as follows. In addition, by installing the tank that houses the stationary induction electrical device under the surface of the water, the substance in contact with the outer surface of the tank is not air but water that has a high heat transfer coefficient. It can be discharged from the surface more effectively outside the tank.

  Here, the heat transfer between the solid surface and the fluid touching the solid surface will be briefly described using the following equation.

q = h × (Tw−Tf)
Where q is the amount of heat passing through the unit surface area of the solid (W / m ² ), h is the heat transfer coefficient of the fluid (W / m ² · K), Tw is the absolute temperature of the solid surface, and Tf is Indicates the absolute temperature of the fluid.

While the heat transfer coefficient of air is several to several tens (W / m ² · K), the heat transfer coefficient of flowing water is about several hundreds (W / m ² · K). The amount of heat released from the tank is much higher than in the air.

  According to the power generating and transforming equipment according to the present invention, since the stationary induction device installed on the floating platform together with the power generation facility is installed below the surface of the water, the space on the floating platform on which the stationary induction device was installed becomes unnecessary. Therefore, the construction cost of equipment can be reduced.

  In addition, by installing the static induction electric device main body tank under the surface of the water, the amount of heat released from the tank is greatly increased as compared to the case of land installation, so the number of coolers can be reduced.

  Furthermore, when the loss generated from the static induction electric body is small, all the heat generated is dissipated from the surface of the tank containing the static induction electric appliance, so that the cooling device attached to the static induction electric appliance is not necessary. If the number of cooling devices is reduced or not required, the maintenance and inspection work for the stationary induction machine can be simplified and the maintenance and inspection time can be shortened.

1 is a schematic configuration diagram of a power generation and transformation facility according to Embodiment 1 of the present invention. The schematic block diagram of the power generation and transformation equipment which concerns on Embodiment 2 of this invention. The schematic block diagram of the conventional power generation substation equipment.

  Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. Here, the power generation and transformation equipment installed on the sea will be described, but the present invention can be similarly applied to the case where it is installed in water such as a river or a lake.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram in the case where a gas-insulated transformer is applied as a static induction electric device which is a transformer device.

  In FIG. 1, the power generation facility 1 is installed on a platform 6 provided on the sea. Electric power generated by the power generation facility 1 is sent to a gas-insulated transformer 31 installed on the seabed 8 via a connection conductor 2 such as an insulated bus or cable. The electric power sent to the gas-insulated transformer is boosted to a high voltage advantageous for long-distance power transmission by the gas-insulated transformer 31 and transmitted to the substation facility 5 installed on the land 9 through the submarine cable 4.

  Thus, by installing the gas-insulated transformer 31 on the seabed 8, a marine platform for installing substation equipment becomes unnecessary.

  Here, the configuration of the gas-insulated transformer 31 will be described. Since the transformer body 33 is housed in the tank 32 filled with the high-pressure insulating gas 34, the tank 32 is newly endured to withstand water pressure. Without being configured, the transformer body 33 can be installed on the sea floor where water pressure is applied.

  Further, the cooling device 35 including a gas cooler that cools the insulating gas 34 that is an insulating and cooling medium and a gas blower that forcibly circulates the insulating gas 34 in the tank 32 includes a transformer tank 32 and a pipe 36. The heat due to the load loss and the no-load loss generated from the transformer main body 33 is released to the outside of the transformer tank 32 via the insulating gas 34.

  The heat generated from the transformer main body 33 is also released from the outer surface of the transformer tank 32 due to the heat conduction of the transformer tank 32. By placing the transformer tank 32 in water, the amount of heat released from the surface outside the tank 32 is significantly increased as compared to the air, so the number of cooling devices such as gas coolers and gas blowers can be reduced.

  Furthermore, when the loss generated from the transformer main body 33 is small, since the heat generation amount is all radiated from the surface of the transformer tank 32, the cooling device attached to the transformer is unnecessary.

  In this embodiment, although the case where the gas insulation transformer was installed in the seabed was demonstrated, it cannot be overemphasized that the same effect can be acquired even when installing in a riverbed or a lake bottom.

  Furthermore, since gas is used for the insulating cooling medium of the transformer, unlike the case where oil is used, even if the cooling medium leaks from the tank, the water surface is not contaminated with oil.

(Embodiment 2)
Hereinafter, Embodiment 2 of the present invention will be described with reference to FIG. Since the present embodiment is obtained by changing a part of the configuration of the first embodiment, the same or similar parts as those of the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different parts are described.

  High pressure insulation of gas circuit breaker, gas disconnect switch, grounding switch, gas insulated bus, etc. on the sea floor 8 between the gas insulated transformer 31 installed on the sea floor 8 and the substation 5 installed on the ground 9 A gas insulated switchgear 37 stored in the tank together with the property gas is installed. Similarly to the gas-insulated transformer 31, the gas-insulated switchgear 37 can be installed on the sea floor where water pressure is applied because a high-pressure insulating gas is sealed in the tank.

  In the power generation and substation equipment configured as described above, there is no need to install an auxiliary equipment for installing a gas insulated switchgear such as a platform on the sea. Furthermore, by installing the gas insulated switchgear, it is possible to cut off the fault current flowing from the system side when a ground fault occurs in the offshore power generation equipment, and to protect the substation equipment and the power generation equipment.

DESCRIPTION OF SYMBOLS 1 ... Power generation equipment, 2 ... Connection conductor, 30 ... Oil-filled transformer, 301 ... Insulating oil,
302 ... Conservator, 31 ... Gas-insulated transformer, 32 ... Tank, 33 ... Transformer body,
34 ... Insulating gas, 35 ... Cooling device, 36 ... Piping, 37 ... Gas insulated switchgear,
4 ... submarine cable, 5 ... substation equipment, 6 ... platform, 7 ... sea, 8 ... submarine,
9 ... ground

Claims (3)

  In the power generation and transformation equipment configured to transmit the power generated by the power generation equipment placed on the water platform to the power transformation equipment installed on the ground via the power transformation equipment and the underwater cable, the power transformation equipment includes gas insulation. A generating and transforming facility comprising a stationary induction device, wherein the gas-insulated stationary induction device is disposed below the water surface.   The power generating and transforming equipment according to claim 1, further comprising a gas insulated transformer as the gas insulated static induction generator.   The power generating / transforming equipment according to claim 2, wherein a gas insulated transformer is provided as a gas insulated static induction machine, and a gas insulated switchgear for protecting the gas insulated transformer is disposed below the water surface.

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