JP2019205348A - Integrated transformation installation - Google Patents

Abstract

To provide an integrated transformation installation capable of reducing the construction period, construction cost, transportation cost and footprint of a transformation installation.SOLUTION: An integrated transformation installation (100) comprises: a transformer body (12) that transforms the voltage between a first voltage and a second voltage that is higher than the first voltage; a transformer tank (10) to accommodate the transformer body (12); an intra-substation transformer body (14) that is connected to the first voltage side of the transformer body (12) and transforms the voltage between the first voltage and a third voltage that is lower than the first voltage; and an earthed transformer body (13) connected to the first voltage side of the transformer body (12). The transformer tank (10) accommodates at least one of the intra-substation transformer body (14) and the earthed transformer body (13).SELECTED DRAWING: Figure 2

Description

  The present invention relates to an intensive substation facility.

  Several substations are provided in the power plant or in the vicinity of the power plant to step up the voltage to a very high voltage of, for example, 500,000 volts when the voltage is sent from the power plant. In addition, the ultra high voltage transmitted through the power grid is a substation that step-downs to a voltage (for example, 22,000 volts or 6600 volts) used in power receiving facilities such as offices and factories. Some are installed on the way. Various facilities constituting the substation equipment installed in the substation tend to increase in size as the transmission voltage and the reception voltage of the substation increase.

  In Patent Document 1, various facilities (units of construction) such as extra-high panels, transformers, high voltage panels, circuit breaker panels, and instrument transformer panels are individually installed, and each facility is arranged according to a system diagram through a duct or the like. Is disclosed.

JP-A-4-26306

  In the substation facility disclosed in Patent Document 1, various facilities constituting the entire substation facility are placed at predetermined positions for installation work, and wiring work for wiring various facilities according to a system diagram is required. For example, when the voltage classification of a substation becomes a special high voltage, the shape of various facilities will also become large, and the period and cost of installation work and wiring work of various facilities will increase.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an intensive substation facility that can reduce the construction period, the construction cost, the transportation cost, and the installation area of the substation facility.

  The intensive substation equipment according to the present invention includes a transformer body that converts a voltage between a first voltage and a second voltage that is higher than the first voltage, a transformer tank that houses the transformer body, An in-house transformer body connected to the first voltage side of the transformer body and converting a voltage between the first voltage and a third voltage lower than the first voltage, and the first of the transformer body A grounding transformer body connected to the voltage side, and at least one of the local transformer body and the grounding transformer body is accommodated in the transformer tank.

  According to the present invention, it is possible to reduce the construction period, construction cost, transportation cost, and installation area of the substation equipment.

It is an external appearance perspective view which shows an example of a structure of the intensive type substation equipment of this Embodiment. It is a top view which shows an example of the principal part structure of the transformer tank of this Embodiment. It is a front view which shows an example of a structure of the intensive type substation equipment of this Embodiment. It is a left view which shows an example of a structure of the intensive type substation equipment of this Embodiment. It is a right view which shows an example of a structure of the intensive type substation equipment of this Embodiment. It is a top view which shows an example of a structure of the intensive type substation equipment of this Embodiment. It is a schematic diagram which shows an example of the attachment state of the feeder board of this Embodiment. It is a schematic diagram which shows the example of installation of the transformation equipment in the case of a comparative example. It is a systematic diagram of the substation equipment in the case of a comparative example. It is a schematic diagram which shows the example of installation of the intensive type substation equipment of this Embodiment. It is a systematic diagram of the intensive type substation equipment of this embodiment.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. FIG. 1 is an external perspective view showing an example of the configuration of the intensive substation equipment 100 of the present embodiment. In the figure, reference numeral 10 denotes a transformer tank. The external dimensions of the transformer tank 10 can be, for example, a length of about 4 m, a width of about 1 m, and a height of about 2 m. For convenience, if the four side plates of the transformer tank 10 are side plates on the front side, the back side, the right side, and the left side, the three side plates on the front side of the transformer tank 10 have three feeder panels 20 (VCB). And a relay board 30 are also arranged. A DC power supply panel 50 and four radiators 60 (also referred to as cooling devices) 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 air bushings 11 are arranged at an appropriate length so as to correspond to each phase of the three-phase alternating current. An NGR panel 40 is disposed 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 board 50 can be detachably attached to the transformer tank 10. That is, all or part of the feeder panel 20, the relay panel 30, the NGR panel 40, and the DC power supply panel 50 can be attached to the transformer tank 10 before the intensive substation facility 100 is carried out of the factory. In addition, after the intensive substation equipment 100 is transported to the installation location, a part of the feeder panel 20, the relay panel 30, the NGR panel 40, and the DC power supply panel 50 can be attached to the transformer tank 10. The arrangement of the feeder panel 20, the relay panel 30, the NGR panel 40, and the DC power supply panel 50 is not limited to the example of FIG. Further, the number of feeder boards 20 and the number of radiators 60 are not limited to the example of FIG.

  Centralized substation facility 100 of the present embodiment is installed in the power plant or in the vicinity of the power plant, and can boost the voltage generated at the power plant and send it to the power transmission network. The intensive substation facility 100 is installed in a substation in the middle of the power transmission network, and can reduce the voltage transmitted through the power transmission network and supply it to power receiving facilities such as offices and factories. In the present specification, a case where the intensive substation facility 100 is installed in a power plant (for example, a solar power plant) or in the vicinity of the power plant and boosts the voltage and sends it to the power transmission network will be described.

  The intensive substation equipment 100 is, for example, an intensive (packaged) substation equipment for extra high (extra high voltage) interconnection substations. The extra high voltage means that the transmission voltage exceeds 7000 volts. The power reception voltage (first voltage) of the intensive substation 100 can be, for example, 22 kV (or 33 kV), and the power transmission voltage (second voltage) is, for example, 77 kV (or 66 kV). be able to. In addition, the receiving voltage (1st voltage) of the intensive type substation equipment 100 can also be 6600V (high voltage). In other words, the intensive substation equipment 100 of the present embodiment can realize a substation equipment that handles extra high voltage or high voltage. Details will be described below.

  FIG. 2 is a plan view showing an example of a main configuration of the transformer tank 10 of the present embodiment. FIG. 2 shows a case where the transformer tank 10 is viewed from above. In FIG. 2, the facilities accommodated in the transformer tank 10 are indicated by broken lines for convenience. An air 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 (power transmission voltage) of 77 kV. In the present embodiment, the 77 kV output terminal is the air bushing 11, but the output terminal is not limited to the air bushing. For example, it may 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 the three phases, an earthed voltage transformer (EVT) body 13, and an in-house transformer body 14. . The transformer tank 10 is filled with insulating oil 2 for cooling the transformer body 12. Although the transformer body 12 is submerged in the insulating oil 2, the grounding transformer body 13 and the in-house transformer body 14 may be in the air instead of in the insulating oil 2. That is, a partition wall is provided between the three transformer main bodies 12, the ground transformer main body 13 and the in-house transformer main body 14, and the insulating oil 2 is injected into the section accommodating the transformer main body 12, and the ground transformer The inside of the compartment accommodating the main body 13 and the in-house transformer main body 14 can be in the air. When the grounding transformer body 13 or the in-house transformer body 14 is accommodated in the transformer tank 10, the grounding transformer body 13 or the in-house transformer body 14 is the same as the transformer body 12 without being an independent transformer. A winding (for example, four windings) may be used.

  The transformer body 12 includes an iron core, a coil, and the like, and boosts the received voltage (first voltage, for example, 22 kV) to the transmission voltage (second voltage, for example, 77 kV).

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

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

  Wiring among the transformer body 12, the grounding transformer body 13, and the in-house transformer body 14 is performed when the transformer body 12, the grounding transformer body 13, and the in-house transformer 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 in-house transformer body 14, but only one of the grounding transformer body 13 and the in-house transformer body 14. May be accommodated.

  Conventionally, a grounding transformer panel (also referred to as an EVT panel) separate from the transformer tank is prepared, and the grounding transformer body is accommodated in the grounding transformer panel. At the installation site of the substation equipment, the installation work is performed with the transformer tank and the grounding transformer panel, which are separately transported, arranged at predetermined positions, and the wiring work is performed according to the system diagram. In the present embodiment, the grounding transformer main body 13 is accommodated in the transformer tank 10, and this is performed when the wiring is also accommodated in the transformer tank 10 between the grounding transformer main body 13 and the transformer main body 12. Thereby, the installation work and wiring work which were performed separately become unnecessary, and the construction period and construction cost of substation equipment can be reduced.

  Conventionally, an in-house transformer panel (also referred to as an in-house TR panel) that is separate from the transformer tank is prepared, and the in-house transformer body is accommodated in the in-house transformer panel. At the installation site of the substation, the transformer tank and the in-house transformer panel, which are separately transported, are arranged at predetermined positions, and the installation work is performed, and the wiring work is performed according to the system diagram. In the present embodiment, the in-house transformer main body 14 is accommodated in the transformer tank 10, and wiring is also accommodated in the transformer tank 10 between the in-house transformer main body 14 and the transformer main body 12. Thereby, the installation work and wiring work which were performed separately become unnecessary, and the construction period and construction cost of substation equipment can be reduced. Moreover, by accommodating the grounding transformer main body 13 and the in-house transformer main body 14 in the transformer tank 10, the EVT board and the in-house TR board 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 according to the present embodiment, and FIG. 4 is a left side view showing an example of the configuration of the intensive substation facility 100 according to the present embodiment. FIG. 5 is a right side view showing an example of the configuration of the intensive type substation facility 100 according to the present embodiment, and FIG. 6 is a plan view showing an example of the configuration of the intensive type substation facility 100 according to the present embodiment.

  As shown in FIGS. 3, 4 and 5, three feeder boards 20 are 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 feeder board 20 and the feeder board 20 is suspended and moved to a predetermined position. 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 panel 20 can be removed from the transformer tank 10 by removing the bolts and nuts. In addition, the structure of the fixture which fixes each board is an example, Comprising: It is not limited to the example shown in each figure, It can substitute by another structure.

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

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

  A vacuum circuit breaker (VCB) is a switch that turns an electric circuit on and off. The electrode of the switch is housed in a high-vacuum container, and a substance that constitutes an arc discharge generated between the electrodes when the current is cut off. It is a circuit breaker that diffuses in a high vacuum and extinguishes the arc.

  Conventionally, the number of VCB boards equivalent to the number of feeders is prepared, and installation work is performed by placing each VCB board transported separately at a predetermined position at the installation site of the substation equipment, and wiring work 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 is also installed just by performing the installation work of the transformer tank 10, and the installation of the VCB panel which is individually required No construction is required. In addition, since wiring to a plurality of vacuum circuit breakers is performed when a plurality of feeder panels 20 are installed around the transformer tank 10, wiring work at the installation site is not required, and the construction period and cost of the substation equipment are reduced. can do.

  As shown in FIGS. 4 and 6, a DC power supply panel 50 is detachably attached around the transformer tank 10. More specifically, the suspension chain is fixed to a hook (not shown) provided on the top plate of the DC power supply panel 50, the DC power supply panel 50 is suspended and moved to a predetermined position, and the DC power supply panel 50 is The plurality of mounting brackets 51 on the upper back can be fixed to the side surface of the transformer tank 10 with bolts and nuts, and the plurality of mounting brackets 52 on the bottom surface of the DC power supply panel 50 can be fixed to the base 1 with bolts and nuts. The DC power supply 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 supply panel 50 accommodates a DC power supply device (DC power supply main body) 53 (see FIG. 11 described later) that supplies a DC voltage for operating a device including a plurality of vacuum circuit breakers. The device is a device that requires a DC voltage as a power source, and includes, for example, a circuit breaker, a disconnector, a protective relay, and other control circuits. In addition, when the cooling device of a transformer is not a self-cooling type, a cooling device is also contained in an apparatus.

  Conventionally, a DC power panel separate from the transformer tank is prepared, and at the installation site of the substation equipment, the transformer tank and the DC power panel that are separately transported are arranged at predetermined positions, and installation work is performed. Wiring work is performed according to the system diagram. In the present embodiment, since the DC power supply panel 50 is attached around the transformer tank 10, the DC power supply panel 50 is also installed only by performing the installation work of the transformer tank 10, and the DC power supply that is individually required. Panel installation work is not required. In addition, since the wiring necessary for mounting the DC power supply panel 50 around the transformer tank 10 is also performed in advance, wiring work at the installation site is not required, 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, the NGR board 40 is suspended and moved to a predetermined position, and the upper part of the back surface of the NGR board 40 is moved. 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 panel 40 can be removed from the transformer tank 10 by removing the bolts and nuts. Moreover, when attaching the NGR board 40 to the transformer tank 10, a required wiring can also be performed by connecting a bushing not shown.

  The NGR panel 40 accommodates a neutral point ground resistor connected to the power receiving voltage side of the transformer body 12. The neutral point ground resistor (NGR) is a resistor that suppresses and detects a ground fault current attached to a neutral point of an earthing transformer (also referred to as EVT or GPT: Grounded Potential Transformer).

  Conventionally, an NGR panel that is separate from the transformer tank is prepared, and at the installation site of the substation equipment, the transformer tank and the NGR panel that are transported separately are placed at predetermined positions, and installation work is performed. Wiring work is performed according to In the present embodiment, since the NGR panel 40 is attached around the transformer tank 10, the NGR panel 40 is also installed only by performing the installation work of the transformer tank 10. No installation work is required. In addition, since wiring necessary for attaching the NGR panel 40 to the periphery of the transformer tank 10 is performed in advance, wiring work at the installation site is not required, and the construction period and construction cost of the substation equipment can be reduced.

  As shown in FIGS. 3, 5 and 6, the relay panel 30 is detachably attached around the transformer tank 10. More specifically, the suspension chain is fixed to a hook (not shown) provided on the top plate of the relay panel 30 and the relay panel 30 is suspended and moved to a predetermined position. A plurality of mounting brackets (not shown) can be fixed to the side surface of the transformer tank 10 with bolts and nuts, and a plurality of mounting brackets 32 on the bottom surface of the relay panel 30 can be fixed to the base 1 with bolts and nuts. The relay panel 30 can be removed from the transformer tank 10 by removing the bolts and nuts. Moreover, when attaching the relay panel 30 to the transformer tank 10, a required wiring can also be performed by connecting a bushing not shown.

  The relay panel 30 includes a plurality of protective 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 power transmission voltage side of the transformer body 12. , 36, 37, and a plurality of protective relays 38 (see FIG. 11) for sending control signals to the circuit breaker VCB 25 in the feeder board 20. The interconnecting switch 300 is, for example, a gas insulated switchgear (GIS: Gas Insulated Switch), and includes a current transformer, a disconnector, a circuit breaker, a lightning arrester, an EVT (grounding transformer), and a grounding device (also a working grounding device). The bus line and the like are housed in a single grounded container filled with a highly insulating gas (for example, sulfur hexafluoride). The arc can be extinguished (extinguished) by blowing a gas against the arc discharge generated between the electrodes when the current is interrupted. The interconnected switch (also referred to as switchgear) may be a hybrid GIS in which the busbar portion is air-insulated and the switchgear is gas-insulated.

  The protective relay detects faults such as short-circuit faults or ground faults that have occurred in substation equipment via instrument transformers, and minimizes the effects of the detected faults on other parts of the power system. Therefore, a failure section is specified and a control signal is sent to the circuit breaker so as to be quickly disconnected from the power system.

  Conventionally, a relay panel separate from the transformer tank is prepared, and at the installation site of the substation equipment, the transformer tank and relay panel transported separately are placed at predetermined positions, and installation work is performed. Wiring work is performed according to In the present embodiment, since the relay panel 30 is attached around the transformer tank 10, installation work for the relay panel 30 is not required. In addition, since the wiring necessary for attaching the relay panel 30 around the transformer tank 10 is also performed in advance, the wiring work at the installation location can be reduced, and the construction period and construction cost of the substation equipment can be reduced. Can do.

  As shown in FIGS. 5 and 6, a radiator 60 that circulates the insulating oil 2 filled in the transformer tank 10 to cool the insulating oil is attached around the transformer tank 10. Although the transformer main body 12 includes an iron core and a coil and can increase the voltage conversion efficiency, copper loss and iron loss occur and change into heat. As the voltage handled by the substation increases, the transformer also handles a larger amount of power, and heat generation becomes a problem. Therefore, 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 body 12 is sent to the radiator 60, cooled by the radiator 60, and circulated into the transformer tank 10 again. Thereby, the substation equipment which handles high voltage (for example, extra high voltage) is realizable.

  As shown in FIG. 6, the widthwise dimensions of the intensive substation 100 with the feeder panel 20, the relay panel 30, the NGR panel 40, the DC power panel 50, and the radiator 60 attached around the transformer tank 10. By setting the value 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 an attachment state of the feeder board 20 of the present embodiment. In FIG. 7, the longitudinal section of the principal part of the transformer tank 10 and the feeder board 20 is shown typically. The transformer tank 10 is filled with insulating oil 2. A transformer body 12 is held in the insulating oil 2. For convenience, the holding member for holding the transformer body 12 is omitted. The transformer body 12 includes an iron core 121, 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 required position on the inner wall of the feeder board 20. The vacuum circuit breaker 23 includes a vacuum valve 24, and the feeder board 20 accommodates a wiring portion 27 wired outside the vacuum valve 24 from an electrode 232 provided in the vacuum valve 24. The vacuum valve 24 is molded with resin 231 (for example, epoxy resin). The wiring portion 27 is molded with a resin 25 (for example, an epoxy resin).

  For example, a voltage of 22 kV is applied to the electric circuit 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 a charging unit such as a vacuum circuit breaker and a wiring unit and a VCB board (touched by a person) that accommodates the vacuum circuit breaker. There was a tendency for the shape of the VCB board to become large. In this embodiment, since the vacuum valve 24 and the wiring part 27 are molded with the resins 231 and 25, the dielectric strength increases, the creepage distance can be made relatively short, and the feeder board 20 can be downsized. And low cost can be realized. In the present embodiment, the vacuum circuit breaker 23 is accommodated in each feeder board 20. However, since the size can be reduced, a plurality of (for example, two) vacuum circuit breakers 23 (2) are provided in one feeder board 20. One of them may be a vacuum breaker 23 for the main feeder).

  As shown in FIG. 7, the connector portion 26 is attached to the side plate 10 a of the transformer tank 10. The connector portion 26 is connected to a lead wire 123 on the power receiving voltage side of the transformer body 12. In addition, the wiring portion 27 molded with the resin 25 of the feeder board 20 is connected to the connector portion 26. The connector portion 26 is, for example, a slip-on type connector, and the lead wire 123 and the wiring portion 27 are electrically connected and insulated by bushing. Thereby, when attaching the feeder panel 20 to the transformer tank 10, it can be simply wired only by the connection of the connector part 26, and complicated wiring construction becomes unnecessary.

  Next, as a comparative example with respect to the present embodiment, a case where various facilities are individually installed at an installation location will be described.

  FIG. 8 is a schematic diagram illustrating an installation example of the substation equipment in the comparative example. FIG. 8 shows a case where each facility is viewed from above, and represents an outline of the installation area (occupied area). As shown in FIG. 8, the substation facilities in the case of the comparative example are the in-house TR board 255, the EVT board 220, the VCB board (main trunk) 230, the VCB board (feeder F1) 240, the VCB board (feeder F2) 250, the VCB board. (Feeder F3) Nine pieces of equipment (units) 260, relay board 210, DC power supply board 270, and NGR board 280 are arranged in a row, for example. For the installation work, for example, concrete foundation work is performed, and each facility is fixed with anchor bolts or the like. Moreover, according to the position of the steel tower of a substation, the interconnection switch 300, VCT (Voltage and Current Transformer: 400), and the transformer 200 are arrange | positioned, and installation work is performed. 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 the substation equipment in the comparative example. In FIG. 9, not all the wirings are shown, and only main wirings are shown. As shown in FIG. 9, in the VCB board (F1) 240, a circuit breaker VCB 241, a current transformer 242, a protection / measurement device 243, and the like are connected. In the VCB board (F2) 250, a circuit breaker VCB251, a current transformer 252 and a protection / measurement device 253 are connected. In the VCB board (F3) 260, a circuit breaker VCB261, a current transformer 262, a protection / measurement device 263, and the like are connected. In the VCB board (main trunk) 230, a current transformer 235, a circuit breaker VCB232, a protection / measurement device 233, a protection relay 234, and the like are connected. In FIG. 9, the NGR board 280 is not shown.

  In the EVT board 220, a lightning arrester 221 and an EVT 222 are connected. In 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 in the DC power supply panel 270. Within the transformer 200, a transformer 202 and current transformers 201 and 203 are connected. In the relay panel 210, protective relays 211, 212, and 213 are connected.

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

  As described above, in the case of the comparative example, various installations constituting the entire substation installation are arranged at predetermined positions and individually installed, and wiring installation for wiring various installations according to the system diagram is required. For example, when the voltage classification of a substation becomes a special high voltage, the shape of various facilities will also become large, and the period and cost of installation work and wiring work of various facilities will increase.

  Next, the case where the intensive type substation equipment 100 of this Embodiment is installed in an installation place is demonstrated.

  FIG. 10 is a schematic diagram showing an installation example of the intensive substation equipment 100 of the present 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 intensive substation facility 100 according to the present embodiment, the interconnection switch 300, the VCT (Combines Voltage and Current Transformer) 400, depending on the position of the steel tower of the substation. In addition, installation work is performed with the centralized substation equipment 100 disposed. That is, in the case of the comparative example shown in FIG. 8, it was necessary to install the transformer 200 and nine units individually. In the present embodiment, only the intensive substation facility 100 needs to be installed. The interconnection switch 300 and the VCT 400 are the same as those in the comparative example shown in FIG.

  Thus, according to this Embodiment, since the man-hour of concrete foundation construction and equipment installation construction can be reduced, the equipment installation construction period can be shortened. In addition, since the number of man-hours for construction can be reduced, construction costs can be reduced.

  In the present embodiment, the grounding transformer main body 13 corresponding to the EVT 222 in the EVT board 220 of FIG. 9 is accommodated in the transformer tank 10. Thereby, in this Embodiment, the EVT board | plate 220 becomes unnecessary and can contribute to size reduction and weight reduction of the shape of the whole substation equipment.

  Further, in the present embodiment, the in-house transformer main body 14 corresponding to the in-house transformer in the in-house TR panel 250 of FIG. 9 is accommodated in the transformer tank 10. Thereby, in this Embodiment, the in-house TR board 250 becomes unnecessary and can contribute to size reduction and weight reduction of the whole substation equipment.

  In this embodiment, the circuit breakers VCB232, 241, 251 and 261 in the VCB board (main trunk) 230, the VCB board (F1) 240, the VCB board (F2) 250, and the VCB board (F3) 260 in FIG. The vacuum circuit breaker 23 and the wiring part 27 corresponding to the above are of the mold type. Thereby, in this Embodiment, the feeder board 20 can be reduced in size while being reduced in size. Further, maintenance is facilitated by reducing the number of facilities (units) and making the vacuum circuit breaker 23 and the wiring section 27 a mold type.

  Moreover, in this Embodiment, the iron core 121 of the transformer main body 12 is made into a type with little iron loss, and the effective cross-sectional area is used for the winding of the coil 122, for example using the twisted wire which twisted many thin wires with a small cross-sectional area. Heat generation can be suppressed by making the transformer with high conversion efficiency by enlarging and reducing copper loss. Thereby, compared with the case of a comparative example, while reducing the shape of the heat radiator 60 and reducing a weight, the number of the heat radiators 60 can be reduced.

  Moreover, the installation area (occupied area) of the intensive substation equipment 100 of this Embodiment can be reduced significantly (for example, about 40%-60%) compared with the case of a comparative example, and installation space is ensured. Becomes easier. Since the intensive substation 100 according to the present embodiment can be reduced in size and weight, for example, the intensive substation 100 can be transported by a single transport vehicle, and a plurality of substations can be transported like a conventional substation. The transportation cost can be reduced as compared with the case of transporting with a transport vehicle.

  FIG. 11 is a system diagram of the intensive substation equipment 100 according to the present embodiment. In FIG. 11, not all wirings are shown, and only main wirings are shown. In FIG. 11, the interconnection switch 300 and the VCT 400 are the same as those in FIG. In the intensive substation 100, a feeder panel 20, a relay panel 30, a DC power panel 50, and an NGR panel 40 (not shown) are arranged around the transformer tank 10.

  In the transformer tank 10, a transformer (transformer body) 12, current transformers 15 and 16, an EVT (grounding transformer) 13, an in-house transformer (in-house transformer body) 14, and a lightning arrester 17 are connected. Yes. In the feeder board 20, a circuit breaker VCB (vacuum circuit breaker) 23, a current transformer 28, a protection / measurement device 29 and the like are connected. In the relay panel 30, protective relays 35, 36, 37, 38 and the like are connected. A DC power supply device 53 is connected in the DC power supply panel 50. In addition, wiring among the transformer tank 10, the feeder panel 20, the relay panel 30, and the DC power supply panel 50 is also realized in advance in the integrated substation facility 100.

  Compared with the comparative example shown in FIG. 9, in this embodiment, the wiring between each equipment (unit) at the installation location can be greatly reduced, the wiring work time is shortened, and the wiring material cost is reduced. Can be reduced.

  In the present embodiment, an on-load tap switching device for suppressing power supply fluctuation can be provided in the transformer tank 10. The on-load tap switching device is a device that can change the turns ratio of the transformer within a required range by selecting a certain point on the tap provided on the winding of the coil. The on-load tap switching device can be housed in a compartment different from the compartment housing the transformer body 12, and the inside of the compartment can be filled with insulating oil.

  The intensive substation equipment of the present embodiment includes a transformer body that converts a voltage between a first voltage and a second voltage that is higher than the first voltage, a transformer tank that houses the transformer body, An in-house transformer body connected to the first voltage side of the transformer body and converting a voltage between the first voltage and a third voltage lower than the first voltage, and the first of the transformer body A grounding transformer body connected to one voltage side, and at least one of the local transformer body and the grounding transformer body is accommodated in the transformer tank.

  In this Embodiment, a transformer tank accommodates the transformer main body which converts a voltage between a 1st voltage and the 2nd voltage higher than the said 1st voltage. The first voltage can be, for example, 22 kV, in which case the second voltage can be 66 kV or 77 kV. The transformer body can be used as a step-up transformer as well as a step-up transformer. The transformer tank is filled with oil for cooling the transformer (iron core and winding).

  The in-house transformer main body is connected to the first voltage side of the transformer main body, and converts the 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-house transformer body supplies, for example, an AC voltage of 105V or 210V to required equipment in the centralized substation facility.

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

  The transformer tank accommodates at least one of the in-house transformer main body and the grounding transformer main body. Conventionally, an in-house transformer panel (in-house TR panel) separate from the transformer tank is prepared, and the in-house transformer body is accommodated in the in-house transformer panel. At the installation site of the substation, the transformer tank and the in-house transformer panel, which are separately transported, are arranged at predetermined positions, and the installation work is performed, and the wiring work is performed according to the system diagram. In the present embodiment, the in-house transformer body is accommodated in the transformer tank, and wiring is also accommodated in the transformer tank between the in-house transformer body and the transformer body. Thereby, the installation work and wiring work which were performed separately become unnecessary, and the construction period and construction cost of substation equipment can be reduced.

  Conventionally, a grounding transformer panel (EVT panel) separate from the transformer tank is prepared, and the grounding transformer body is accommodated in the grounding transformer panel. At the installation site of the substation equipment, the installation work is performed with the transformer tank and the grounding transformer panel, which are separately transported, arranged at predetermined positions, and the wiring work is performed according to the system diagram. In the present embodiment, the grounding transformer main body is accommodated in the transformer tank, and wiring is also accommodated between the grounding transformer main body and the transformer main body in the transformer tank. Thereby, the installation work and wiring work which were performed separately become unnecessary, and the construction period and construction cost of substation equipment can be reduced.

  The intensive 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 panel that houses the plurality of vacuum circuit breakers, The feeder panel is detachably attached around the transformer tank.

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

  A vacuum circuit breaker (VCB) is a switch that turns on and off the electric circuit. The switch breaker electrode is housed in a high-vacuum container, and the arc discharge generated between the electrodes when the current is cut off. It is a circuit breaker that diffuses the constituent materials in a high vacuum to extinguish the arc.

  In this embodiment, a feeder board (VCB board) that houses a plurality of vacuum circuit breakers is detachably attached around the transformer tank. Conventionally, the number of VCB boards equivalent to the number of feeders is prepared, and installation work is performed by placing each VCB board transported separately at a predetermined position at the installation site of the substation equipment, and wiring work according to the system diagram Is done. In this embodiment, since the feeder panel is installed around the transformer tank, the feeder panel is installed only by installing the transformer tank, and the installation work of the VCB panel that was individually required is unnecessary. Become. In addition, since wiring to multiple vacuum circuit breakers is performed when the feeder panel is installed around the transformer tank, no wiring work is required at the installation location, and the construction period and cost of the substation equipment can be reduced. .

  In the intensive substation equipment according to the present embodiment, the vacuum circuit breaker includes a vacuum valve, and the feeder panel includes a wiring portion wired from the electrode provided in the vacuum valve to the outside of the vacuum valve. The vacuum valve and the wiring part are molded with resin.

  In the present embodiment, the vacuum circuit breaker includes a vacuum valve. The feeder board includes a wiring portion wired outside the vacuum valve from an electrode provided in the vacuum valve. The vacuum valve and the wiring part are molded with resin (for example, epoxy resin). For example, a voltage of 22 kV is applied to the electric circuit that is interrupted by the electrode 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 a charging unit such as a vacuum circuit breaker and a wiring unit and a VCB board (touched by a person) that accommodates the vacuum circuit breaker. There was a tendency for the shape of the VCB board to become large. In this embodiment, since the vacuum valve and the wiring part are molded with resin, the dielectric strength increases, the creepage distance can be made relatively short, the feeder board can be downsized, and the cost can be reduced. Can be realized.

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

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

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

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

  A DC power panel is detachably attached around the transformer tank. Conventionally, a DC power panel separate from the transformer tank is prepared, and at the installation site of the substation equipment, the transformer tank and the DC power panel that are separately transported are arranged at predetermined positions, and installation work is performed. Wiring work is performed according to the system diagram. In this embodiment, since the DC power supply panel is attached around the transformer tank, the DC power supply panel is also installed just by performing the installation work of the transformer tank. Is no longer necessary. In addition, since wiring necessary for attaching the DC power supply panel around the transformer tank is also performed in advance, wiring work at the installation site becomes unnecessary, and the construction period and construction cost of the substation equipment can be reduced.

  The intensive substation equipment of the present embodiment includes a neutral point ground resistor connected to the first voltage side, and an NGR panel that accommodates the neutral point ground resistor, and the NGR panel is the transformer Removably attached around the container tank.

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

  An NGR panel is detachably mounted around the transformer tank. Conventionally, an NGR panel that is separate from the transformer tank is prepared, and at the installation site of the substation equipment, the transformer tank and the NGR panel that are transported separately are placed at predetermined positions, and installation work is performed. Wiring work is performed according to In this embodiment, since the NGR panel is installed around the transformer tank, the NGR panel is installed only by performing the installation work of the transformer tank, and the installation work of the NGR panel that was individually required is unnecessary. Become. In addition, since wiring necessary for attaching the NGR panel around the transformer tank is also performed in advance, wiring work at the installation place becomes unnecessary, and the construction period and construction cost of the substation equipment can be reduced.

  The intensive substation equipment of the present embodiment accommodates a plurality of protective relays that send control signals to the plurality of circuit breakers provided in the switchgear connected to the second voltage side, and the plurality of protective relays And the relay panel is detachably attached around the transformer tank.

  In the present embodiment, the relay panel houses a plurality of protective relays that send control signals to the plurality of circuit breakers provided in the switchgear connected to the second voltage side of the transformer body. The switchgear is, for example, a gas insulated switchgear (GIS: Gas Insulated Switch), a current transformer, a disconnector, a circuit breaker, a lightning arrester, an EVT (grounding transformer), a grounding device (also referred to as a working grounding device), This is an apparatus in which a bus line or the like is accommodated in a single grounded container filled with a gas having high insulating properties (for example, sulfur hexafluoride). The arc can be extinguished (extinguished) by blowing a gas against the arc discharge generated 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.

  The protective relay detects faults such as short-circuit faults or ground faults that have occurred in substation equipment via instrument transformers, and minimizes the effects of the detected faults on other parts of the power system. Therefore, a failure section is specified and a control signal is sent to the circuit breaker so as to be quickly disconnected from the power system.

  A relay panel is detachably mounted around the transformer tank. Conventionally, a relay panel separate from the transformer tank is prepared, and at the installation site of the substation equipment, the transformer tank and relay panel transported separately are placed at predetermined positions, and installation work is performed. Wiring work is performed according to In the present embodiment, since the relay panel is attached around the transformer tank, the installation work of the relay panel becomes unnecessary. In addition, since the wiring necessary for mounting 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 intensive substation equipment of this 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 the present embodiment, a cooling device for circulating the insulating oil filled in the transformer tank and cooling the insulating oil is attached around the transformer tank. Although the transformer body includes an iron core and a coil and can increase the voltage conversion efficiency, copper loss and iron loss occur and change into heat. As the voltage handled by the substation increases, the transformer also handles a larger amount of power, and heat generation becomes a problem. Therefore, the transformer tank is filled with insulating oil, and the transformer body is accommodated therein. The insulating oil that has absorbed the heat generated in the transformer body is sent to the cooling device, cooled by the cooling device, and circulated again into the transformer tank. Thereby, the substation equipment which handles a high voltage is realizable.

  In the intensive substation according to the present embodiment, the first voltage is classified as an extra high voltage or a high voltage, and the second voltage is classified as an extra high voltage.

  In the present embodiment, the first voltage is classified into a special high voltage (also referred to as a special high) or a high voltage, and the second voltage is classified into a special high voltage. The extra high voltage means that the transmission voltage exceeds 7000 volts. The first voltage is 22 kV or 33 kV, and the second voltage is 66 kV or 77 kV. The first voltage may be 6600 V (high voltage). Thereby, the substation equipment which handles extra high voltage or high voltage is realizable.

  Note that at least a part of the above-described embodiments can be arbitrarily combined.

1 Base 2 Insulating Oil 10 Transformer Tank 11 Air Bushing 12 Transformer Body 121 Iron Core 122 Coil 123 Lead Wire 13 Grounding Transformer Body (EVT)
14 Transformer body 15, 16 Current transformer 17 Lightning arrester 20 Feeder panel (VCB panel)
21, 22, 32, 41, 42, 51, 52 Mounting bracket 23 Vacuum circuit breaker (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 Protection relay 40 NGR panel 50 DC power panel 53 DC power supply (DC power supply Body)
60 radiator 61 conservator

Claims (9)

A transformer body for converting a voltage between a first voltage and a second voltage higher than the first voltage;
A transformer tank that houses the transformer body;
An in-house transformer body that is connected to the first voltage side of the transformer body and converts a voltage between the first voltage and a third voltage lower than the first voltage;
A grounding transformer body connected to the first voltage side of the transformer body,
An intensive substation facility in which at least one of the in-house transformer body and the grounding transformer body is accommodated in the transformer tank. A plurality of vacuum circuit breakers interposed in a plurality of feeders connected to the first voltage side;
A feeder board for accommodating the plurality of vacuum circuit breakers,
The intensive substation equipment according to claim 1, wherein the feeder panel is detachably attached around the transformer tank. The vacuum circuit breaker is
Equipped with a vacuum valve,
The feeder board is
A wiring portion wired outside the vacuum valve from an electrode provided in the vacuum valve;
The intensive substation according to claim 2, wherein the vacuum valve and the wiring part are molded with resin. It is attached to a side plate of the transformer tank, and includes a connector portion to which the lead wire on the first voltage side of the transformer body is connected,
The intensive substation according to claim 3, wherein the wiring part molded with the resin is connected to the connector part. A DC power supply body for supplying a DC voltage for operating a device including the plurality of vacuum circuit breakers;
A DC power supply panel that houses the DC power supply main body,
The intensive substation equipment according to any one of claims 2 to 4, wherein the DC power supply panel is detachably attached around the transformer tank. A neutral grounding resistor connected to the first voltage side;
An NGR board for accommodating the neutral grounding resistor,
The intensive type substation equipment according to any one of claims 1 to 5, wherein the NGR panel is detachably attached around the transformer tank. A plurality of protective relays for sending a control signal to each of a plurality of circuit breakers provided in the switchgear connected to the second voltage side;
A relay panel for accommodating the plurality of protective relays,
The intensive substation equipment according to any one of claims 1 to 6, wherein the relay panel is detachably attached around the transformer tank. A cooling device for cooling the insulating oil by circulating the insulating oil filled in the transformer tank;
The intensive substation according to any one of claims 1 to 7, wherein the cooling device is attached around the transformer tank.   The intensive substation according to any one of claims 1 to 8, wherein the first voltage is classified into an extra high voltage or a high voltage, and the second voltage is divided into an extra high voltage.

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