JP7220270B2 - Transformer equipment - Google Patents

Description

The present invention relates to transformer installations.

Several substations are installed in or near the power plant to step up the voltage from the power plant to very high voltages, for example 500,000 volts, in stages. In addition, the ultra-high voltage transmitted via the power grid is stepped down to the voltage used by power receiving facilities such as offices and factories (e.g., 22,000 volts or 6,600 volts). Some are installed in the middle of the 2. Description of the Related Art Various types of equipment that constitute transforming equipment installed in a substation tend to increase in size as the transmission voltage and receiving voltage of the substation increase.

In Patent Document 1, various equipment (structural units) such as a special high-voltage board, a transformer, a high-voltage board, a circuit breaker board, and a voltage transformer board are installed individually, and each facility is connected according to a system diagram via a duct or the like. is disclosed.

JP-A-4-26306

In the substation equipment disclosed in Patent Document 1, installation work is performed after arranging various equipment that constitutes the entire substation equipment at predetermined positions, and wiring work is required to wire the various equipment according to the system diagram. For example, when the voltage division of a substation becomes extra-high voltage, the shape of various equipment becomes large, and the period and cost of installation work and wiring work of various equipment increase.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transformer installation that can reduce the construction period, construction cost, transportation cost, and installation area of the substation equipment.

A transformer installation according to the present invention has a transformer main body, long side plates and short side plates, a transformer tank for accommodating the transformer main body, and a transformer tank arranged on the long side of the transformer tank. A radiator and a conservator disposed above the transformer, wherein the total dimension of the width of the short side plate and the width of the radiator in the width direction is within the limits for land transportation. .

According to the present invention, the construction period, construction cost, transportation cost, and installation area of substation equipment can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external perspective view which shows an example of a structure of the centralized substation equipment of this Embodiment. FIG. 2 is a plan view showing an example of the main configuration of the transformer tank of the present embodiment; BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows an example of a structure of the centralized substation equipment of this Embodiment. 1 is a left side view showing an example of the configuration of an intensive substation facility according to the present embodiment; FIG. 1 is a right side view showing an example of the configuration of an intensive substation facility according to the present embodiment; FIG. 1 is a plan view showing an example of the configuration of an intensive substation facility according to the present embodiment; FIG. It is a schematic diagram which shows an example of the attachment state of the feeder board of this Embodiment. FIG. 5 is a schematic diagram showing an installation example of substation equipment in the case of a comparative example; It is a system diagram of the substation equipment in the case of a comparative example. 1 is a schematic diagram showing an installation example of an intensive substation facility according to the present embodiment; FIG. 1 is a system diagram of an intensive substation facility according to the present embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on the drawings showing its embodiments. FIG. 1 is an external perspective view showing an example of the configuration of an intensive substation facility 100 according to this embodiment. In the figure, reference numeral 10 is a transformer tank. The outer dimensions of the transformer tank 10 can be, for example, about 4 m long, about 1 m wide, and about 2 m high. Assuming that the four side plates of the transformer tank 10 are front side, rear side, right side, and left side side plates for convenience, the front side plate of the transformer tank 10 has three feeder boards 20 (VCB board) and a relay board 30 are arranged. A DC power panel 50 and four radiators 60 (also referred to as a cooling device) are arranged on the side plate on the back side of the transformer tank 10 . On the right side plate of the transformer tank 10, three aerial bushings 11 are arranged at appropriate intervals corresponding to each phase of the three-phase alternating current. An NGR panel 40 is arranged on the left side plate of the transformer tank 10 . A conservator 61 is attached to the top plate of the transformer tank 10 .

The feeder board 20 , the relay board 30 , the NGR board 40 and the DC power supply board 50 can be detachably attached to the transformer tank 10 . That is, all or part of the feeder board 20, the relay board 30, the NGR board 40, and the DC power supply board 50 can be attached to the transformer tank 10 before the centralized substation equipment 100 is carried out from the factory. Moreover, after transporting the centralized substation equipment 100 to the installation site, a part of the feeder board 20, the relay board 30, the NGR board 40, and the DC power supply board 50 can be attached to the transformer tank 10. The arrangement of each of the feeder board 20, the relay board 30, the NGR board 40 and the DC power supply board 50 is not limited to the example shown in FIG. Also, the number of feeder boards 20 and the number of radiators 60 are not limited to the example in FIG.

The centralized substation equipment 100 of the present embodiment is installed in or near a power plant, and can boost the voltage generated in the power plant and send it out to the power grid. In addition, the centralized substation equipment 100 is installed in a substation in the middle of the power grid, and can step down the voltage transmitted via the power grid and supply it to power receiving equipment such as offices and factories. In this specification, the centralized substation facility 100 is installed in or near a power plant (for example, a solar power plant) to step up the voltage and send it out to the power grid.

The centralized substation equipment 100 is, for example, a centralized (packaged) substation equipment for an extra-high voltage (extra-high voltage) interconnection substation. Extra high voltage refers to transmission voltage exceeding 7000 volts. The receiving voltage (first voltage) of the centralized substation facility 100 may be, for example, 22 kV (or may be 33 kV), and the transmitting voltage (second voltage) may be, for example, 77 kV (or may be 66 kV). be able to. In addition, the receiving voltage (first voltage) of the intensive substation equipment 100 can be set to 6600 V (high voltage). That is, the intensive substation equipment 100 of the present embodiment can realize a substation equipment that handles extra high voltage or high voltage. A detailed description will be given below.

FIG. 2 is a plan view showing an example of the main configuration of the transformer tank 10 of this embodiment. FIG. 2 shows the transformer tank 10 viewed from above. In FIG. 2, for the sake of convenience, the facilities housed in the transformer tank 10 are indicated by dashed lines. An aerial bushing 11 is attached to the right side plate of the transformer tank 10 . The air bushing 11 is a terminal for outputting a voltage of 77 kV (transmission voltage). In this embodiment, the output terminal on the 77 kV side is the air bushing 11, but the output terminal is not limited to the air bushing. For example, it can be a gas bushing directly connected to a gas insulated switchgear (GIS: Gas Insulated Switch).

As shown in FIG. 2, the transformer tank 10 accommodates three transformer bodies 12 corresponding to each of three phases, an earthed voltage transformer (EVT) body 13, and a station transformer body 14. . Further, the transformer tank 10 is filled with insulating oil 2 for cooling the transformer main body 12 . Although the transformer main body 12 is submerged in the insulating oil 2, the grounding transformer main body 13 and the in-station transformer main body 14 may be not in the insulating oil 2 but in the air. That is, partition walls are provided between the three transformer main bodies 12 and the grounding transformer main body 13 and the in-station transformer main body 14, and insulating oil 2 is injected into the partition containing the transformer main bodies 12 to The compartment housing the main body 13 and the in-station transformer main body 14 can be in the air. When the grounding transformer main body 13 or the in-station transformer main body 14 is housed in the transformer tank 10, the grounding transformer main body 13 or the in-station transformer main body 14 is not an independent transformer, but is the same as the transformer main body 12. A winding configuration (for example, four windings) may be employed.

The transformer main body 12 includes an iron core, a coil, and the like, and boosts a power reception voltage (first voltage, eg, 22 kV) to a power transmission voltage (second voltage, eg, 77 kV).

The grounding transformer body 13 is connected to the receiving voltage side of the transformer body 12 . The grounding transformer main body 13 is used to detect the zero-phase voltage on the receiving voltage side of the transformer main body 12 and, for example, cut off a required electric circuit when a single-line ground fault occurs.

The in-station transformer main body 14 is connected to the receiving voltage side of the transformer main body 12, and converts the receiving voltage to a low voltage (third voltage, eg, 210 to 105 V). The in-station transformer main body 14 supplies, for example, an AC voltage of 105V or 210V to required equipment in the centralized substation facility 100 .

The wiring between the transformer main body 12, the grounding transformer main body 13 and the in-station transformer main body 14 is performed when the transformer main body 12, the grounding transformer main body 13 and the in-station transformer main body 14 are installed in the transformer tank 10. . In the example of FIG. 2, the transformer tank 10 accommodates both the grounding transformer body 13 and the station transformer body 14, but only one of the grounding transformer body 13 and the station transformer body 14 is stored. may be accommodated.

Conventionally, a grounding transformer panel (also called an EVT panel) was prepared separately from the transformer tank, and the grounding transformer itself was housed in the grounding transformer panel. At the installation site of the substation equipment, the separately transported transformer tank and grounding transformer panel are placed at predetermined positions, installation work is performed, and wiring work is performed according to the system diagram. In this embodiment, grounding transformer main body 13 is accommodated in transformer tank 10 and wiring between grounding transformer main body 13 and transformer main body 12 is also accommodated in transformer tank 10 . This eliminates the need for separate installation work and wiring work, and reduces the construction period and construction cost of the substation equipment.

Further, conventionally, a station transformer panel (also called a station TR panel) was prepared separately from the transformer tank, and the station transformer itself was housed in the station transformer panel. At the installation site of the substation equipment, the separately transported transformer tank and the on-site transformer panel are arranged at predetermined positions, installation work is performed, and wiring work is performed according to the system diagram. In this embodiment, the in-station transformer main body 14 is housed in the transformer tank 10 and the wiring between the in-station transformer main body 14 and the transformer main body 12 is also housed in the transformer tank 10 . This eliminates the need for separate installation work and wiring work, and reduces the construction period and construction cost of the substation equipment. Further, by housing the grounding transformer main body 13 and the in-station transformer main body 14 in the transformer tank 10, the EVT panel and the in-station TR panel become unnecessary, and the installation space can be reduced.

Next, various facilities attached around the transformer tank 10 will be described.

FIG. 3 is a front view showing an example of the configuration of the intensive substation facility 100 of this embodiment, and FIG. 4 is a left side view showing an example of the configuration of the intensive substation facility 100 of this embodiment. 5 is a right side view showing an example of the configuration of the intensive substation facility 100 of this embodiment, and FIG. 6 is a plan view showing an example of the configuration of the intensive substation facility 100 of this embodiment.

As shown in FIGS. 3, 4 and 5, three feeder discs 20 are detachably mounted around the transformer tank 10. As shown in FIG. More specifically, a suspension chain is fixed to a hook (not shown) provided on the top plate of the feeder board 20 to suspend the feeder board 20, move it to a predetermined position, and lift the upper back of the feeder board 20. A plurality of mounting brackets 21 can be fixed to the side surface of the transformer tank 10 with bolts and nuts, and a plurality of mounting brackets 22 on the bottom surface of the feeder board 20 can be fixed to the base 1 with bolts and nuts. The feeder board 20 can be removed from the transformer tank 10 by removing the bolts and nuts. It should be noted that the configuration of the fixing metal fittings for fixing each board is an example, and is not limited to the example shown in each drawing, and can be substituted with another configuration.

Each feeder board 20 houses a vacuum circuit breaker (VCB). The vacuum circuit breaker is interposed in a feeder (electrical circuit) connected to the receiving voltage side of the transformer main body 12 . The feeder of the feeder panel 20 includes, for example, a photovoltaic panel and a PCS (DC to AC converter) via a sub-substation transformer (eg, 22 kV/440 V) and low-voltage wiring (approximately 200 V to 400 V). Connected.

In addition, when the transformer main body 12 is a step-down transformer, for example, each of the plurality of feeders is connected to the factory via a sub-substation transformer (for example, 22 kV / 440 V) and low-voltage wiring (about 200 V to 400 V). and office power receiving equipment.

A vacuum circuit breaker (VCB) is a switch that turns on and off an electric circuit. The electrodes of the switch are housed in a high-vacuum container, and the material that forms the arc discharge that occurs between the electrodes when the current is interrupted is A circuit breaker that extinguishes an arc by diffusing it in a high vacuum.

Conventionally, a number of VCB boards corresponding to the number of feeders are prepared, and at the installation site of the substation equipment, installation work is carried out by arranging each VCB board transported separately at a predetermined position, and wiring work is performed according to the system diagram. is done. In this embodiment, since the feeder panel 20 is attached around the transformer tank 10, the feeder panel 20 can be installed only by performing the installation work for the transformer tank 10, and the VCB panel which was required separately can be installed. No construction work is required. In addition, since wiring for a plurality of vacuum circuit breakers is also performed when a plurality of feeder panels 20 are attached around the transformer tank 10, there is no need for wiring work at the installation site, reducing the construction period and construction cost of the substation equipment. can do.

As shown in FIGS. 4 and 6, a DC power panel 50 is detachably mounted around the transformer tank 10. As shown in FIG. More specifically, a suspension chain is fixed to a hook (not shown) provided on the top plate of the DC power supply panel 50 to suspend the DC power supply panel 50 and move it to a predetermined position. A plurality of mounting metal fittings 51 on the upper rear surface can be fixed to the side surface of the transformer tank 10 with bolts and nuts, and a plurality of mounting metal fittings 52 on the bottom surface of the DC power panel 50 can be fixed to the base 1 with bolts and nuts. The DC power panel 50 can be removed from the transformer tank 10 by removing the bolts and nuts. Further, when the DC power supply panel 50 is attached to the transformer tank 10, necessary wiring can be performed by connecting a bushing (not shown).

The DC power panel 50 accommodates a DC power supply (DC power supply main body) 53 (see FIG. 11 described later) that supplies a DC voltage for operating equipment including a plurality of vacuum circuit breakers. A device is a device that requires a DC voltage as a power source, and includes, for example, circuit breakers, disconnectors, protective relays, and other control circuits. If the transformer cooling device is not self-cooling type, the cooling device is also included in the equipment.

Conventionally, a DC power supply board separate from the transformer tank is prepared, and at the installation site of the substation equipment, the separately transported transformer tank and DC power supply board are placed in their respective positions and installation work is carried out. Wiring work will be carried out according to the system diagram. In this embodiment, the DC power supply board 50 is attached around the transformer tank 10, so that the DC power supply board 50 can be installed only by performing the installation work of the transformer tank 10. Panel installation work is not required. In addition, since the wiring necessary for installing the DC power supply board 50 around the transformer tank 10 is also performed in advance, wiring work at the installation site is unnecessary, and the construction period and construction cost of the substation equipment can be reduced. .

As shown in FIGS. 3, 4 and 6, an NGR (Neutral Grounding Resistor) board 40 is detachably attached around the transformer tank 10 . More specifically, a suspension chain is fixed to a hook (not shown) provided on the top plate of the NGR board 40 to suspend the NGR board 40, move it to a predetermined position, and lift the upper back of the NGR board 40. A plurality of mounting brackets 41 can be fixed to the side surface of the transformer tank 10 with bolts and nuts, and a plurality of mounting brackets 42 on the bottom surface of the NGR panel 40 can be fixed to the base with bolts and nuts. The NGR board 40 can be removed from the transformer tank 10 by removing the bolts and nuts. Further, when the NGR board 40 is attached to the transformer tank 10, necessary wiring can be performed by connecting a bushing (not shown).

NGR board 40 houses a neutral grounding resistor that is connected to the receiving voltage side of transformer body 12 . A neutral point grounding resistor (NGR) is a resistor that suppresses and detects a ground fault current attached to the neutral point of a grounding transformer (EVT or GPT: Grounded Potential Transformer).

Conventionally, an NGR panel is prepared separately from the transformer tank, and at the installation site of the substation equipment, the separately transported transformer tank and NGR panel are placed in their respective positions and installation work is carried out. Wiring work will be carried out according to In this embodiment, since the NGR panel 40 is attached around the transformer tank 10, the NGR panel 40 can be installed simply by performing the installation work for the transformer tank 10. No installation work is required. In addition, since the wiring required when installing the NGR board 40 around the transformer tank 10 is also performed in advance, the wiring work at the installation site becomes unnecessary, and the construction period and construction cost of the transformer equipment can be reduced.

As shown in FIGS. 3, 5 and 6, a relay board 30 is detachably mounted around the transformer tank 10. As shown in FIG. More specifically, a suspension chain is fixed to a hook (not shown) provided on the top plate of the relay board 30 to suspend the relay board 30, move it to a predetermined position, and lift the upper back of the relay board 30. A plurality of mounting brackets (not shown) can be fixed to the side of the transformer tank 10 with bolts and nuts, and a plurality of mounting brackets 32 on the bottom surface of the relay board 30 can be fixed to the base 1 with bolts and nuts. The relay board 30 can be removed from the transformer tank 10 by removing the bolts and nuts. Further, when the relay board 30 is attached to the transformer tank 10, necessary wiring can be performed by connecting a bushing (not shown).

The relay board 30 includes a plurality of protection relays 35 that send control signals to the circuit breaker VCB 303 (see FIG. 11) provided in the interconnection switch 300 (see FIG. 11) connected to the transmission voltage side of the transformer main body 12. , 36, 37, and a plurality of protective relays 38 (see FIG. 11) that deliver control signals to the circuit breaker VCB 25 in the feeder board 20. FIG. The interconnection switch 300 is, for example, a gas insulated switchgear (GIS: Gas Insulated Switch), and includes a current transformer, a disconnecting switch, a circuit breaker, a lightning arrester, an EVT (grounding transformer), an earthing device (also known as a working earthing device). ), bus lines, etc., in a single grounded container filled with highly insulating gas (for example, sulfur hexafluoride). The arc can be extinguished (extinguished) by blowing gas against the arc discharge that occurs between the electrodes when the current is interrupted. The interconnection switch (also referred to as a switchgear) may be a hybrid GIS in which the busbar portion is air-insulated and the switchgear is gas-insulated.

Protective relays detect faults such as short circuits or ground faults that occur in substation equipment via instrument transformers, and minimize the effects of detected faults on other parts of the power system. Therefore, the fault section is identified and a control signal is sent to the circuit breaker so as to quickly disconnect it from the power system.

Conventionally, a relay panel separate from the transformer tank was prepared, and at the installation site of the substation equipment, the separately transported transformer tank and relay panel were placed in their respective positions and installation work was carried out. Wiring work will be carried out according to In this embodiment, since the relay board 30 is attached around the transformer tank 10, installation work for the relay board 30 is not required. In addition, since the wiring required when installing the relay panel 30 around the transformer tank 10 is also performed in advance, the wiring work at the installation site can be reduced, and the construction period and construction cost of the substation equipment can be reduced. can be done.

As shown in FIGS. 5 and 6, a radiator 60 is attached around the transformer tank 10 for circulating the insulating oil 2 filled in the transformer tank 10 to cool the insulating oil. The transformer main body 12 includes an iron core, a coil, and the like, and can improve voltage conversion efficiency. The higher the voltage handled by the substation equipment, the greater the power that the transformer handles, causing heat generation to become a problem. Therefore, the inside of the transformer tank 10 is filled with the insulating oil 2, and the transformer main body 12 is accommodated therein. The insulating oil 2 that has absorbed the heat generated in the transformer main body 12 is sent to the radiator 60, cooled by the radiator 60, and circulated into the transformer tank 10 again. This makes it possible to implement substation equipment that handles high voltage (for example, extra high voltage).

As shown in FIG. 6, with the feeder panel 20, the relay panel 30, the NGR panel 40, the DC power supply panel 50 and the radiator 60 attached around the transformer tank 10, the widthwise dimension of the centralized substation facility 100 is is within a predetermined value (for example, 3 m), the entire intensive substation facility 100 can be collectively mounted on a transport vehicle and transported.

FIG. 7 is a schematic diagram showing an example of the mounting state of the feeder board 20 of this embodiment. FIG. 7 schematically shows vertical cross sections of main parts of the transformer tank 10 and the feeder board 20 . The transformer tank 10 is filled with insulating oil 2 . A transformer body 12 is held in the insulating oil 2 . For the sake of convenience, a holding member for holding the transformer main body 12 is omitted. The transformer main body 12 includes an iron core 121 and a coil 122 and the like, and a lead wire 123 is led out from the coil 122 .

A vacuum circuit breaker 23 is fixed at a desired position on the inner wall of the feeder board 20 . The vacuum circuit breaker 23 has a vacuum valve 24 , and the feeder board 20 accommodates a wiring portion 27 that is wired from an electrode 232 provided inside the vacuum valve 24 to the outside of the vacuum valve 24 . The vacuum valve 24 is molded with resin 231 (for example, epoxy resin). Also, the wiring portion 27 is molded with a resin 25 (for example, epoxy resin or the like).

A voltage of 22 kV, for example, is applied to the electric path that is interrupted by the electrode 232 of the vacuum circuit breaker 23 . For this reason, conventionally, it is necessary to provide a relatively long creepage distance in order to maintain sufficient insulation between live parts such as a vacuum circuit breaker and a wiring part and the VCB board (touched by people) that houses the vacuum circuit breaker. There was a tendency for the shape of the VCB disk to become large. In this embodiment, since the vacuum valve 24 and the wiring portion 27 are molded with the resins 231 and 25, the dielectric strength is increased, the creepage distance can be relatively shortened, and the size of the feeder board 20 can be reduced. and low cost can be realized. In this embodiment, the vacuum circuit breakers 23 are housed in each of the feeder boards 20. However, since the size can be reduced, one feeder board 20 can accommodate a plurality of (for example, two) vacuum circuit breakers 23 (2 one of which may be the vacuum interrupter 23 for the main feeder).

As shown in FIG. 7, the connector portion 26 is attached to the side plate 10a of the transformer tank 10. As shown in FIG. A lead wire 123 on the receiving voltage side of the transformer main body 12 is connected to the connector portion 26 . A wiring portion 27 molded with the resin 25 of the feeder board 20 is connected to the connector portion 26 . The connector part 26 is, for example, a slip-on type connector, in which the lead wire 123 and the wiring part 27 are electrically connected and insulated by a bushing. As a result, when the feeder board 20 is attached to the transformer tank 10, wiring can be easily performed only by connecting the connector portion 26, and complicated wiring work is not required.

Next, as a comparative example with respect to this embodiment, a case where various types of equipment are individually installed at an installation site will be described.

FIG. 8 is a schematic diagram showing an installation example of substation equipment in the case of a comparative example. FIG. 8 shows the installation area (occupied area) of each facility as viewed from above. As shown in FIG. 8, the substation equipment in the case of the comparative example includes an in-house TR board 255, an EVT board 220, a VCB board (main) 230, a VCB board (feeder F1) 240, a VCB board (feeder F2) 250, and a VCB board. (Feeder F3) 260, relay board 210, DC power supply board 270, and NGR board 280 are arranged and installed in a row, for example. In the installation work, for example, concrete foundation work is performed, and each facility is fixed with anchor bolts or the like. Also, according to the position of the steel tower of the substation, the interconnection switch 300, the VCT (Voltage and Current Transformer) 400, and the transformer 200 are placed and installed. A duct is provided between the transformer 200 and each facility, and necessary wiring work is performed through the duct.

FIG. 9 is a system diagram of substation equipment in the case of a comparative example. It should be noted that FIG. 9 does not show all the wiring, but shows only the main wiring. As shown in FIG. 9, in the VCB board (F1) 240, a circuit breaker VCB 241, a current transformer 242, a protection/measuring device 243, etc. are connected. In the VCB board (F2) 250, a circuit breaker VCB 251, a current transformer 252, a protection/measuring device 253, etc. are connected. In the VCB board (F3) 260, a circuit breaker VCB 261, a current transformer 262, a protection/measuring device 263, etc. are connected. In the VCB board (master) 230, a current transformer 235, a circuit breaker VCB 232, a protection/measuring device 233, a protection relay 234, etc. are connected. Note that the NGR board 280 is not shown in FIG.

A lightning arrester 221, an EVT 222, and the like are connected in the EVT board 220. FIG. Inside the in-house TR board 255, an in-house transformer 256 (22 kV/105 V) is connected. A DC power supply device 271 is connected within the DC power panel 270 . Inside the transformer 200, a transformer 202 and current transformers 201 and 203 are connected. Protective relays 211 , 212 and 213 are connected in the relay board 210 .

In the interconnection switch 300, a current transformer 301, a disconnecting switch 302, a circuit breaker VCB 303, a lightning arrester 304, an earthing device 305, and an EVT 306 are connected. As shown in FIG. 9, in-house TR board 250, EVT board 220, VCB board (master) 230, VCB board (feeder F1) 240, VCB board (feeder F2) 250, VCB board (feeder F3) 260, relay board 210 , the DC power panel 270, the NGR panel 280, the transformer 200, the VCT 400, and the interconnection switch 300, it is necessary to make wiring connections using many cables.

As described above, in the case of the comparative example, it is necessary to arrange the various facilities that make up the entire substation facility at predetermined positions and perform individual installation work, as well as wiring work for wiring the various facilities according to the system diagram. For example, when the voltage division of a substation becomes extra-high voltage, the shape of various equipment becomes large, and the period and cost of installation work and wiring work of various equipment increase.

Next, a case of installing the intensive substation facility 100 of the present embodiment at an installation site will be described.

FIG. 10 is a schematic diagram showing an installation example of the intensive substation equipment 100 of this embodiment. FIG. 10 shows a case where each facility is viewed from above, and represents an outline of the installation area (occupied area). As shown in FIG. 10 , in the case of the centralized substation facility 100 of the present embodiment, the interconnection switch 300 and the VCT (Combines Voltage and Current Transformer) 400 are connected according to the position of the steel tower of the substation. , and the centralized substation equipment 100 are arranged and installed. That is, in the case of the comparative example shown in FIG. 8, work was required to individually install the transformer 200 and nine units. In this embodiment, only the centralized substation equipment 100 needs to be installed. Note that the interconnection switch 300 and the VCT 400 are the same as those in the comparative example shown in FIG. 8, so they are illustrated using dashed lines for convenience.

As described above, according to the present embodiment, it is possible to reduce the number of man-hours for concrete foundation work and facility installation work, so that the facility installation work period can be shortened. In addition, since the man-hours for construction work can be reduced, construction costs can be reduced.

Further, in this embodiment, the grounding transformer body 13 corresponding to the EVT 222 in the EVT board 220 in FIG. 9 is accommodated in the transformer tank 10 . As a result, in this embodiment, the EVT board 220 is not required, which contributes to the miniaturization and weight reduction of the entire transforming equipment.

Further, in this embodiment, the in-station transformer body 14 corresponding to the in-station transformer in the in-station TR board 250 of FIG. 9 is housed in the transformer tank 10 . As a result, in the present embodiment, the in-house TR board 250 is not required, which contributes to the reduction in size and weight of the entire substation equipment.

Further, in this embodiment, circuit breakers VCBs 232, 241, 251, 261 in VCB board (master) 230, VCB board (F1) 240, VCB board (F2) 250, and VCB board (F3) 260 in FIG. The vacuum circuit breaker 23 and the wiring portion 27 corresponding to are of the mold type. As a result, in the present embodiment, the size of the feeder board 20 can be reduced and the cost can be reduced. Also, maintenance is facilitated by reducing the number of equipment (units) and molding the vacuum circuit breaker 23 and the wiring section 27 .

In the present embodiment, the core 121 of the transformer main body 12 is of a type with little iron loss, and the winding of the coil 122 is, for example, a twisted wire obtained by twisting a large number of fine wires having a small cross-sectional area, thereby reducing the effective cross-sectional area. Heat generation can be suppressed by making the transformer high in conversion efficiency by increasing . As a result, the shape and weight of the radiator 60 can be reduced and the number of radiators 60 can be reduced as compared with the case of the comparative example.

In addition, the installation area (occupied area) of the centralized substation equipment 100 of the present embodiment can be significantly reduced (for example, about 40% to 60%) compared to the case of the comparative example, and the installation space can be secured. becomes easier. Since the centralized substation equipment 100 of the present embodiment can be reduced in size and weight, for example, the centralized substation equipment 100 can be transported by one transport vehicle, and a plurality of units can be transported like conventional substation equipment. transportation cost can be reduced compared to the case of transportation by a transportation vehicle.

FIG. 11 is a system diagram of the centralized substation equipment 100 of this embodiment. Note that FIG. 11 does not show all the wiring, but shows only the main wiring. In FIG. 11, the interconnection switch 300 and the VCT 400 are the same as in FIG. 9, so their description is omitted. In the centralized substation facility 100, a feeder panel 20, a relay panel 30, a DC power supply panel 50, and an NGR panel 40 (not shown) are arranged around a transformer tank 10.

In the transformer tank 10, a transformer (transformer main body) 12, current transformers 15 and 16, an EVT (grounding transformer) 13, a station transformer (station transformer main body) 14, a lightning arrester 17, etc. are connected. there is In the feeder board 20, a circuit breaker VCB (vacuum circuit breaker) 23, a current transformer 28, a protection/measuring device 29, etc. are connected. In the relay board 30, protection relays 35, 36, 37, 38, etc. are connected. A DC power supply device 53 is connected within the DC power panel 50 . Further, mutual wiring among the transformer tank 10 , the feeder board 20 , the relay board 30 and the DC power supply board 50 is also realized in advance within the centralized substation facility 100 .

Compared to the comparative example shown in FIG. 9, in this embodiment, the wiring between each equipment (unit) at the installation site can be greatly reduced, the wiring construction time is shortened, and the wiring material cost is reduced. reduction can be realized.

In this embodiment, an on-load tap changer may be provided in the transformer tank 10 to suppress power supply fluctuations. An on-load tap changer is a device that allows the turns ratio of a transformer to be varied within a desired range by selecting a point on the tap on the winding of the coil. The on-load tap changer can be housed in a compartment separate from the compartment housing the transformer body 12, and the compartment can be filled with insulating oil.

The centralized substation facility of the present embodiment includes a transformer body that converts voltage between a first voltage and a second voltage higher than the first voltage, a transformer tank that houses the transformer body, a station transformer main body connected to the first voltage side of the transformer main body and converting voltage between the first voltage and a third voltage lower than the first voltage; A grounding transformer body connected to the first voltage side, and at least one of the in-station transformer body and the grounding transformer body is accommodated in the transformer tank.

In this embodiment, the transformer tank houses a transformer body that converts voltage between a first voltage and a second voltage that is higher than the first voltage. The first voltage may be, for example, 22 kV, where the second voltage may be 66 kV or 77 kV. The transformer body can be used as a step-up transformer as well as a step-down transformer. The transformer tank is filled with oil for cooling the transformer (iron core and windings).

The station transformer body is connected to the first voltage side of the transformer body and converts voltage between the first voltage and a third voltage lower than the first voltage. The third voltage can be, for example, 105V or 210V. The in-station transformer main body supplies, for example, 105V or 210V AC voltage to required equipment in the centralized substation facility.

A grounded transformer body is connected to the first voltage side of the transformer body. The grounding transformer body is also called an EVT (Earthed Voltage Transformer), and is used to detect the zero-phase voltage on the first voltage side of the transformer body and, for example, to cut off the electric circuit when a single-line ground fault occurs. be done.

The transformer tank houses at least one of the station transformer body and the grounding transformer body. Conventionally, a station transformer panel (station TR panel) was prepared separately from the transformer tank, and the station transformer itself was housed in the station transformer panel. At the installation site of the substation equipment, the separately transported transformer tank and the on-site transformer panel are arranged at predetermined positions, installation work is performed, and wiring work is performed according to the system diagram. In this embodiment, the in-station transformer main body is accommodated in the transformer tank, and the wiring between the in-station transformer main body and the transformer main body is also accommodated in the transformer tank. This eliminates the need for separate installation work and wiring work, and reduces the construction period and construction cost of the substation equipment.

Conventionally, a grounding transformer panel (EVT panel) was prepared separately from the transformer tank, and the grounding transformer main body was housed in the grounding transformer panel. At the installation site of the substation equipment, the separately transported transformer tank and grounding transformer panel are placed at predetermined positions, installation work is performed, and wiring work is performed according to the system diagram. In this embodiment, the grounding transformer main body is accommodated in the transformer tank, and the wiring between the grounding transformer main body and the transformer main body is also accommodated in the transformer tank. This eliminates the need for separate installation work and wiring work, and reduces the construction period and construction cost of the substation equipment.

The centralized substation equipment of the present embodiment includes a plurality of vacuum circuit breakers interposed in a plurality of feeders connected to the first voltage side, and a feeder board accommodating the plurality of vacuum circuit breakers, The feeder disc is removably mounted around the transformer tank.

In this embodiment, a plurality of vacuum circuit breakers are interposed in a plurality of feeders connected to the first voltage side of the transformer main body. When the transformer main body is a step-up transformer, each of the plurality of feeders is connected to, for example, a sub-substation transformer (for example, 22 kV / 440 V) and low-voltage wiring (about 200 V to 400 V), a photovoltaic panel and a PCS (DC/AC converter) are connected. In addition, when the transformer main body is a step-down transformer, each of the multiple feeders is connected to the factory or the The receiving equipment of the office, etc. are connected.

A vacuum circuit breaker (VCB) is a switch that turns on and off an electric circuit. The electrodes of the switch are housed in a high-vacuum container, and the arc discharge that occurs between the electrodes when interrupting the current is eliminated. A circuit breaker that extinguishes arcs by diffusing constituent materials in a high vacuum.

In this embodiment, a feeder board (VCB board) accommodating a plurality of vacuum circuit breakers is detachably attached around the transformer tank. Conventionally, a number of VCB boards corresponding to the number of feeders are prepared, and at the installation site of the substation equipment, installation work is carried out by arranging each VCB board transported separately at a predetermined position, and wiring work is performed according to the system diagram. is done. In this embodiment, since the feeder panel is attached around the transformer tank, the feeder panel is installed only by installing the transformer tank, and the installation work of the VCB panel, which was required separately, is not required. Become. In addition, when the feeder panel is installed around the transformer tank, wiring for multiple vacuum circuit breakers is also performed, eliminating the need for wiring work at the installation site, and reducing the construction period and construction cost of the substation equipment. .

In the centralized substation facility of the present embodiment, the vacuum circuit breaker includes a vacuum valve, and the feeder board includes a wiring portion that is wired from an electrode provided in the vacuum valve to the outside of the vacuum valve. , the vacuum valve and the wiring portion are molded with resin.

In this embodiment, the vacuum circuit breaker includes a vacuum valve. The feeder board has a wiring portion that is wired from an electrode provided inside the vacuum valve to the outside of the vacuum valve. The vacuum valve and wiring are molded with resin (for example, epoxy resin). A voltage of, for example, 22 kV is applied to the electric circuit that is interrupted by the electrodes of the vacuum circuit breaker. For this reason, conventionally, it is necessary to provide a relatively long creepage distance in order to maintain sufficient insulation between live parts such as a vacuum circuit breaker and a wiring part and the VCB board (touched by people) that houses the vacuum circuit breaker. There was a tendency for the shape of the VCB disk to become large. In this embodiment, since the vacuum valve and the wiring part are molded with resin, the dielectric strength is increased, the creepage distance can be relatively shortened, the feeder board can be miniaturized, and the cost can be reduced. can be realized.

The centralized substation equipment of the present embodiment includes a connector portion attached to the side plate of the transformer tank, to which the lead wire on the first voltage side of the transformer main body is connected, and molded with the resin. A wiring portion is connected to the connector portion.

In this embodiment, the connector portion is attached to the side plate of the transformer tank. A lead wire on the first voltage side of the transformer main body is connected to the connector portion. A wiring part molded with resin of the feeder board is connected to the connector part. The connector section is, for example, a slip-on type connector, in which the lead wire and the wiring section are electrically connected and insulated by a bushing. As a result, when the feeder panel is attached to the transformer tank, wiring can be easily performed by simply connecting the connector portion, and complicated wiring work is not required.

The centralized substation equipment of the present embodiment includes a connector portion attached to the side plate of the transformer tank, to which the lead wire on the first voltage side of the transformer main body is connected, and molded with the resin. A wiring portion is connected to the connector portion.

In the present embodiment, the DC power panel accommodates a DC power supply body that supplies a DC voltage for operating equipment including a plurality of vacuum circuit breakers. A device is a device that requires a DC voltage as a power source, and includes, for example, a cooling device for a transformer, a circuit breaker, a disconnecting switch, a protection relay, and other control circuits.

A DC power panel is removably mounted around the transformer tank. Conventionally, a DC power supply board separate from the transformer tank is prepared, and at the installation site of the substation equipment, the separately transported transformer tank and DC power supply board are placed in their respective positions and installation work is carried out. Wiring work will be carried out according to the system diagram. In this embodiment, the DC power supply panel is installed around the transformer tank, so the DC power supply panel can also be installed simply by performing the installation work for the transformer tank, and the installation work for the DC power supply panel that was required separately. becomes unnecessary. In addition, since the wiring necessary for installing the DC power supply panel around the transformer tank is also performed in advance, wiring work at the installation site is unnecessary, and the construction period and construction cost of the substation equipment can be reduced.

The centralized substation equipment of the present embodiment includes a neutral point grounding resistor connected to the first voltage side, and an NGR board accommodating the neutral point grounding resistor, wherein the NGR board is the transformer It is detachably attached around the vessel tank.

In this embodiment, the NGR (Neutral Grounding Resistor) board accommodates a neutral grounding resistor connected to the first voltage side of the transformer body. A neutral point grounding resistor (NGR) is a resistor that suppresses and detects a ground fault current attached to the neutral point of a grounding transformer (EVT or GPT: Grounded Potential Transformer).

An NGR panel is removably mounted around the transformer tank. Conventionally, an NGR panel is prepared separately from the transformer tank, and at the installation site of the substation equipment, the separately transported transformer tank and NGR panel are placed in their respective positions and installation work is carried out. Wiring work will be carried out according to In this embodiment, since the NGR panel is attached around the transformer tank, the NGR panel can also be installed simply by performing the installation work for the transformer tank. Become. In addition, since the wiring necessary for installing the NGR panel around the transformer tank is also performed in advance, wiring work at the installation site is not necessary, and the construction period and construction cost of the substation equipment can be reduced.

The centralized substation facility of the present embodiment accommodates a plurality of protection relays that send control signals to each of a plurality of circuit breakers provided in the switchgear connected to the second voltage side, and the plurality of protection relays. and a relay board, wherein the relay board is detachably mounted around the transformer tank.

In this embodiment, the relay board accommodates a plurality of protection relays that send control signals to each of a plurality of circuit breakers provided in a switchgear connected to the second voltage side of the transformer main body. The switchgear is, for example, a gas insulated switchgear (GIS: Gas Insulated Switch), and includes current transformers, disconnectors, circuit breakers, lightning arresters, EVTs (grounding transformers), grounding devices (also called working grounding devices), It is a device in which a bus line and the like are housed in a single grounded container filled with highly insulating gas (for example, sulfur hexafluoride). The arc can be extinguished (extinguished) by blowing gas against the arc discharge that occurs between the electrodes when the current is interrupted. The switchgear may be a hybrid GIS in which the busbar portion is air-insulated and the switchgear is gas-insulated.

Protective relays detect faults such as short circuits or ground faults that occur in substation equipment via instrument transformers, and minimize the effects of detected faults on other parts of the power system. Therefore, the fault section is identified and a control signal is sent to the circuit breaker so as to quickly disconnect it from the power system.

A relay board is removably mounted around the transformer tank. Conventionally, a relay panel separate from the transformer tank was prepared, and at the installation site of the substation equipment, the separately transported transformer tank and relay panel were placed in their respective positions and installation work was carried out. Wiring work will be carried out according to In this embodiment, since the relay panel is attached around the transformer tank, installation work for the relay panel is unnecessary. In addition, since the wiring necessary for installing the relay panel around the transformer tank is also performed in advance, the wiring work at the installation site can be reduced, and the construction period and construction cost of the substation equipment can be reduced. .

The centralized substation facility of the present embodiment includes a cooling device that circulates the insulating oil filled in the transformer tank to cool the insulating oil, and the cooling device is attached around the transformer tank. .

In this embodiment, a cooling device is attached around the transformer tank to cool the insulating oil by circulating the insulating oil filled in the transformer tank. The main body of the transformer includes an iron core, a coil, and the like, and can improve voltage conversion efficiency. The higher the voltage handled by the substation equipment, the greater the power that the transformer handles, causing heat generation to become a problem. Therefore, the inside of the transformer tank is filled with insulating oil, and the main body of the transformer is accommodated therein. The insulating oil that has absorbed the heat generated in the main body of the transformer is sent to the cooling device, cooled by the cooling device, and circulated into the transformer tank again. As a result, substation equipment that handles high voltage can be realized.

In the centralized substation facility of the present embodiment, the first voltage is classified into extra high voltage or high voltage, and the second voltage is classified into extra high voltage.

In the present embodiment, the first voltage is classified as extra high voltage (also referred to as extra high voltage) or high voltage, and the second voltage is classified as extra high voltage. Extra high voltage refers to transmission voltage exceeding 7000 volts. The first voltage will be 22 kV or 33 kV and the second voltage will be 66 kV or 77 kV. Also, the first voltage may be 6600 V (high voltage). As a result, substation equipment that handles extra high voltage or high voltage can be realized.

At least part of the above-described embodiments can be combined arbitrarily.

REFERENCE SIGNS LIST 1 base 2 insulating oil 10 transformer tank 11 air bushing 12 transformer main body 121 core 122 coil 123 lead wire 13 earthing transformer main body (EVT)
14 In-station transformer body 15, 16 Current transformer 17 Lightning arrester 20 Feeder board (VCB board)
21, 22, 32, 41, 42, 51, 52 Mounting bracket 23 Vacuum circuit breaker (circuit breaker VCB)
232 electrode 24 vacuum valve 231, 25 resin 26 connector part 27 wiring part 28 current transformer 29 protection/measuring instrument 30 relay panel 35, 36, 37, 38 protective relay 40 NGR panel 50 DC power panel 53 DC power supply (DC power supply body)
60 radiator 61 conservator

Claims (2)

a transformer body;
a transformer tank having a long side plate and a short side plate and containing the transformer main body;
a radiator disposed on the longitudinal side of the transformer tank;
a conservator positioned above the transformer tank ;
At least one equipment structural unit is detachably attached to a longitudinal side opposite to a longitudinal side of the transformer tank in which the radiator is arranged,
The total dimension of the width of the short side plate, the width of the radiator in the width direction , and the width of the facility in the width direction is within the limit value for land transportation.
Transformer equipment. inside the transformer tank, a transformer body for converting a voltage between a first voltage and a second voltage higher than the first voltage; and connected to the first voltage side of the transformer body, at least one of a station transformer body that converts voltage between the first voltage and a third voltage lower than the first voltage and a grounding transformer body connected to the first voltage side of the transformer body; are housed in parallel side-by-side on the longitudinal side plates,
Transformer installation according to claim 1 .

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