JP2016213931A - High voltage power incoming installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high voltage power incoming installation which reduces a space required for installation and also easily performs maintenance inspection of a transformer.SOLUTION: Inside a box body 1, a tank 14 is mounted in which a combination transformer capable of supplying electric power to a single-phase power supply and a three-phase power supply is housed. A plurality of single phase transformers constituting the combination transformer are vertically arranged so as to be overlapped on each other. As a result, an installation area is reduced. A primary side terminal 24 and a secondary side terminal 25 of the combination transformer are provided on a front wall 14a of the tank. On the front side of the box body, a primary door 21 and a secondary door 22 of a whole area door are provided. A cutout gear 18 is arranged between the tank and a door, the primary side terminal and the secondary side terminal are constituted so as to be capable of being visually recognized when the primary door and the secondary door are opened.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a high-voltage power receiving facility.

  A user who has concluded a high-voltage power supply contract for supplying high-voltage power flowing through the transmission line to the user as it is is converted into low-voltage power of about 100 V or about 200 V by using high-voltage power receiving equipment managed on the user side. As the high-voltage power receiving equipment, for example, a cubicle type high-voltage power receiving equipment (hereinafter referred to as “cubicle”) is generally used. As shown schematically in FIG. 1, the cubicle has a box 1 in which a first storage portion 4 in which a transformer 3 is stored by a partition wall 2 and a second storage portion in which a shut-off device 5 and the like are stored. 6 is separated. The two interrupting devices 5 are arranged on the opposite side of the transformer, and may be arranged separately for a general power source and an emergency power source. The emergency power interrupting device 5 is partitioned by a partition wall 9. In FIG. 1, illustration of devices such as a switch arranged on the primary side is omitted. Further, front and rear doors 7 are respectively provided before and after the box 1. The entire door 7 is opened to perform various inspection operations. In addition, the primary and secondary terminals 8 of the transformer 3 adopt a configuration that protrudes upward from the upper surface side of the transformer 3. This type of cubicle is disclosed in Patent Documents 1 and 2 and the like.

JP 2009-189076 A JP 2001-189076 A

  For example, sprinklers and other fire protection equipment require single-phase and three-phase power supplies. Therefore, the high-voltage power receiving facility has a configuration in which a single-phase transformer and a three-phase transformer are separately arranged on a plane. As a result, the installation area increases. Further, in order to perform the inspection, it is necessary to secure a space for opening / closing movement of the full face door 7 in order to open / close the full face door 7. Therefore, in the cubicle having the configuration shown in FIG. 1, in addition to the plane area of the box body 1 of two cubicles, a wide area for opening and closing the entire door 7 is required in front of and behind the box body 1 and installation space is increased. It will be restricted. In addition, a certain space is secured around the outer periphery of the transformer 3 for the purpose of enhancing the heat dissipation effect, and this also becomes a factor of increasing the planar dimension of the cubicle box 1.

  Furthermore, since the opening part for heat dissipation is provided in the wall surface of the box 1 by the side of the 1st accommodating part 4 for heat radiation, external dust etc. may penetrate | invade in the box body 1. FIG. In order to prevent the intruding dust from being applied to the blocking device 5, the partition wall 2 is arranged so as to block the whole in the vertical and horizontal directions. Therefore, in the cubicle structure shown in FIG. 1, even if the front door 7 is opened, the terminals of the transformer 3 installed on the rear side of the partition wall 2 cannot be seen.

  Moreover, the height of the transformer 3 is lower than the height of the box 1, for example, there are some that are about half the height of the box 1. Although not shown in the schematic diagram, in an actual device, various devices and wirings are arranged around the primary and secondary terminals 8 installed on the upper surface of the transformer 3, and the entire front surface side is arranged. If the door 7 is simply opened, the state of the terminal 8 cannot be easily confirmed, and the inspection is performed by opening the rear door 7 on the rear side, which makes it difficult to perform the inspection work. Further, as one of the inspection work, there is a case where the insulating oil filled in the transformer 3 is collected and the state thereof is confirmed. The oil collection hole for collecting the insulating oil is installed on the upper surface of the transformer 3, and this also has a problem that it is difficult to perform the operation as in the inspection operation of the terminal 8.

  In order to solve the above-described problems, the present invention includes (1) a combination transformer capable of supplying power to a single-phase power source and a three-phase power source in a box, and a plurality of single-phase transformers constituting the combination transformer. The devices are stacked on the top and bottom, a front door is provided on the front side of the box, a terminal of the combination transformer is provided on the front side, and a breaker connected to the terminal is provided between the combination transformer and the front door. The terminal is arranged so that the terminal can be visually recognized when the door is opened. In order to stack a plurality of single-phase transformers on the top and bottom, a combination in which another single-phase transformer is arranged on one single-phase transformer may be used. For example, when three single-phase transformers are provided, the single-phase transformers are not limited to three one-by-one, and one stage has two single-phase transformers arranged side by side. A total of two layers may be used.

  Since the combination transformer is used to supply power to the single-phase power supply and the three-phase power supply, and the plurality of single-phase transformers constituting the combination transformer are arranged so as to be stacked one above the other, The installation area can be reduced as compared with the case where phase transformers are prepared and arranged side by side. In addition, the terminal of the combination transformer is placed on the front side, and the terminal is visible when the front door on the front side is opened, so the terminal status can be checked and maintained just by opening the front door. Convenience of inspection is improved. In addition, since maintenance and inspection can be performed from the front side in this way, it is not necessary to provide a full door on the rear side of the box, and it is necessary to secure an area for opening and closing the full door on the rear side of the box provided in the past The space required for installation can be reduced.

  (2) It is good to comprise the oil collection hole of the said combination transformer in the said front side, and it can comprise the insulating oil of the said combination transformer from the said oil collection hole by opening the said whole surface door. This is preferable because the inspection work by collecting the insulating oil can be easily performed and the convenience of maintenance inspection can be further improved.

  (3) A transparent protective member may be detachably disposed on the front side of the terminal, and the terminal may be visible through the protective member when the entire door is opened. By providing the protective member, the state of the terminal can be confirmed via the protective member while preventing the operator from accidentally touching the terminal while the door is fully open and ensuring safety. Further, since the protective member can be attached and detached, as a result of confirmation by visual recognition, when work such as cleaning and replacement is necessary, the terminal can be easily exposed by removing the protective member, and a predetermined work can be performed.

(4) The plurality of single-phase transformers constituting the combination transformer are housed in a tank alone or in any combination, and the front wall of the tank (the wall surface portion on the front side of the tank) is used as the combination transformer. It is preferable to serve as a partition wall that separates the storage portion for storing the storage device and the storage portion for storing the shut-off device. In this way, there is no space between the tank (transformer) and the partition wall, and further miniaturization can be achieved.

(5) The combination transformer is connected to a single-phase transformer between three lines, and two single-phase transformers of two different rated capacities are connected by a different-capacity V-connection method. A combination transformer that can output power for load and power for three-phase load, and the difference between the maximum and minimum rated capacity of each single-phase transformer connected between the three wires is set. It may be configured to be below the reference value.

  Since the single-phase transformer is connected to all three lines, the single-phase transformer is not disconnected between all the lines, and no line having a capacity of 0 kVA is generated. Therefore, the difference between the maximum value and the minimum value of the capacity between the lines is the difference between the maximum value and the minimum value of the rated capacity of the three actually connected single-phase transformers. That is, since the minimum value is not 0, it is easy to keep the equipment unbalance rate low. Furthermore, by setting the difference between the maximum value and the minimum value to be equal to or less than the set reference value, the deviation of the rated capacity of the three single-phase transformers is reduced, and the equipment unbalance rate can be easily lowered. In addition, by appropriately setting the reference value, the general consumer satisfies the high voltage power receiving equipment regulations and uses the equipment.

  In that case, among the single-phase transformers connected between the three lines, two single-phase transformers having a large rated capacity may be V-connected. In this way, the power for the three-phase load is defined by the rated capacity of the single-phase transformer with the smaller rated capacity that is V-connected, and can be output stably, and the capacity of the output power is also It is good because it becomes clear. On the other hand, the power for single-phase load corresponds to the sum of the difference between the rated capacities of two single-phase transformers connected in V connection and the rated capacity of the remaining single-phase transformer. Large-capacity three-phase power can be supplied from a single-phase transformer.

Further, two single-phase transformers among the single-phase transformers connected between the three lines are respectively V-connected, and the sum of the rated capacities of the two single-phase transformers is managed by an electric power company. It is equal to the rated capacity of the single-phase transformer that is connected to the V-connected single-phase transformer mounted on the multi-family housing transformer of the different capacity V-connection method, and the V-connection of each single-phase transformer connected between the three wires is not connected The rated capacity of the single-phase transformer may be equal to the rated capacity of the single-phase transformer that is not connected to the V-connection and is mounted on the multi-family housing transformer of the different capacity V-connection system. In this way, the output can be equivalent to that of a multifamily housing transformer owned and managed by a power company, and it can be owned by a general consumer from the power supply based on a low-voltage power supply contract using a multifamily housing transformer owned by the power company. It may be possible to switch to power supply based on a high-voltage power supply contract using a combination transformer to be managed and to increase the range of selection of a combination transformer to be installed in a new apartment house.
Further, the reference value is preferably 100 kVA. In this case, even if the equipment unbalance rate is large, it is preferable because it satisfies the high voltage power receiving equipment regulations.

  In the present invention, the space required for installing the high-voltage power receiving facility can be reduced, and the maintenance and inspection of the transformer can be easily performed.

It is a figure which shows a prior art example. It is a schematic block diagram which shows suitable embodiment of the high voltage | pressure power receiving equipment which concerns on this invention. (A) is a top view which shows an example of the specific structure of suitable embodiment of the high voltage | pressure power receiving equipment which concerns on this invention, (b) is the front view. (A) is the left view, (b) is the right view. It is a figure which shows the connection of the single phase transformer in the suitable one form of the combination transformer used for the high voltage power receiving equipment which concerns on this invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not construed as being limited thereto, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

  2 is a schematic configuration diagram in which the circuit on the primary side is omitted, FIGS. 3 and 4 are diagrams illustrating an example of a specific device configuration, and FIG. 5 is a diagram of a single-phase transformer constituting the combination transformer. It is a figure which shows a connection. The cubicle of this embodiment has a function capable of supplying power to single-phase and three-phase power supplies in one box 10.

  A plurality of single-phase transformers are mounted in the tank 14, and power is supplied to the single-phase power supply and the three-phase power supply by appropriately connecting each single-phase transformer. Specifically, in this embodiment, for example, three single-phase transformers are used and connected as shown in FIG. That is, the first single-phase transformer 11 is connected between the UVs, the second single-phase transformer 12 is connected between the VWs, and the third single-phase transformer 13 is connected between the WUs. In this way, single-phase transformers are connected between the three lines, respectively, so that no single-phase transformer is not connected between all the lines. As a result, a line having a capacitance of 0 kVA does not occur.

  Further, the first single-phase transformer 11 and the second single-phase transformer 12 have different capacitance V connections, and the third single-phase transformer 13 has an AA connection. By doing in this way, it becomes a combination transformer provided with three primary side terminals 24 and seven secondary side terminals 25, and the power for single-phase load and the power for three-phase load are obtained from the combination transformer. Is output. Further, in this embodiment, since the power is supplied to the general power supply and the emergency power supply, the secondary side terminal 25 of the combination transformer is appropriately connected in parallel and branched to provide a single-phase general power supply, three Connect to the general phase power supply, single-phase emergency power supply, and three-phase emergency power supply.

The high-voltage power receiving equipment managed by the user is subject to the restrictions of the high-voltage power receiving equipment regulations. According to the high voltage power receiving equipment specification JEAC8011, the equipment unbalance rate needs to be suppressed to 30% or less. However, when any of the following conditions is satisfied, the facility unbalance rate is not limited to 30% or less.
(1) In the case of a single-phase transformer of 100 kVA or less in high-voltage power reception (2) In the case of the maximum-minimum difference between the single-phase transformers connected between each line is 100 kVA or less in high-voltage power reception

Therefore, in order to satisfy the condition (2), the difference between the maximum and minimum rated capacities of the single-phase transformers connected between the wires is set to 100 kVA or less. Specifically, the rated capacity of the first single-phase transformer 11 is 150 kVA, the rated capacity of the second single-phase transformer 12 is 50 kVA, and the rated capacity of the third single-phase transformer 13 is 100 kVA.
By taking such a configuration, the equipment unbalance rate is
Equipment imbalance rate = (A / B) x 100 [%]
A = Maximum and minimum difference in total capacity of single-phase transformers connected between each line B = Total transformer capacity × 1/3
So,
A = 150-50 = 100
B = (50 + 150 + 100) × 1/3 = 100
Than,
Facility imbalance rate = (100/100) × 100 = 100 [%]
It becomes.

  Further, the difference in transformer capacity is 100 kVA because the maximum value is 150 kVA of the first single-phase transformer 11 and the minimum value is 50 kVA of the second single-phase transformer 12. Therefore, since the condition of “when the maximum and minimum difference between the single-phase transformers connected between the wires is 100 kVA or less in high-voltage power reception” is satisfied, the high-voltage power receiving equipment regulations are also satisfied.

  Furthermore, when each single-phase transformer is mounted on the tank 14, the first single-phase transformer 11 having the largest rated capacity and the largest size and shape is installed, and the second single-phase transformer 12 and the second single-phase transformer 12 Three three-phase transformers 13 may be arranged. Since the plurality of single-phase transformers are arranged one above the other in the tank 14 in this way, the plane area of the tank 14 is not so large as compared with the case where one transformer is mounted. The size can be reduced. Further, the height of the tank 14 is higher than that of the tank in which one existing transformer is mounted. As shown in FIG. 1, the height of the tank in which one transformer is originally mounted is a box. Therefore, even if the height of the tank 14 increases, the height of the box 10 does not have to be so large as compared with the conventional one.

  Furthermore, the tank 14 is mounted on the rear side of the box 10. The front wall 14a, which is a side plate on the front side of the tank 14, is protruded toward the left and right, and the protruding portion 14a 'is provided so as to protrude inward at a predetermined position on the inner peripheral surface of the box body 10. Link to the barrier 32. Thereby, the front wall 14a, the protruding portion 14a ′, and the like have a function of a partition wall that partitions the rear side first storage portion 15 that stores the tank 14 and the front side space. Further, the space on the front side partitioned by the partition wall is divided into right and left, a second storage portion 17 for storing a primary side switch (LBS with fuse) 16 and the like, a secondary side blocking device (MCCB) 18 and the like. Is provided with a third storage portion 19. The switch 16 is installed between the three primary terminals 24 of the combination transformer in the tank 14 and the U, V, and W of the system. The shut-off device 18 includes a single-phase general power source, a three-phase general power source, a single-phase emergency power source, and a three-phase emergency power source. And the two interruption | blocking apparatuses 18 for emergency power supplies are covered with the partition 29, and it is set as the fire prevention aspect. By adopting such a fire protection mode, for example, the operation of the single-phase emergency power shut-off device 18 and the three-phase emergency power shut-off device 18 is guaranteed in the event of a fire.

  The front side of the box 10 is provided with a full-face door that opens and closes. In the present embodiment, a primary door 21 that closes the front of the primary side second storage portion 17 and a secondary door 22 that closes the front of the secondary side third storage portion 19 are provided, and the primary side and the secondary side are provided. Can be opened and closed independently. In FIG. 2, one door is drawn on behalf of the primary door 21 and the secondary door 22 for the convenience of comparing the door opening / closing region with the conventional example shown in FIG. 1. As shown in FIG. 3 and subsequent figures, the double doors of the primary door 21 and the secondary door 22 are used. In addition, it is not disturbed to make it one door as shown in the schematic diagram of FIG.

  Further, the primary terminal 24 of the combination transformer mounted on the tank 14 and the secondary terminal 25 of the combination transformer are arranged so as to protrude forward from the front wall 14 a of the tank 14. That is, the front end portions of the primary side terminal 24 and the secondary side terminal 25 are located in the second storage portion 17 and the third storage portion 19 on the front side of the box body 10. The primary side terminal 24 and the secondary side terminal 25 are installed at the front side without the switch 16, the shut-off device 18, etc., and when the primary door 21 is opened, the primary side terminal 24 is visible from the front. The secondary terminal 25 can be seen from the front when the secondary door 22 is opened.

  In the present embodiment, the primary side terminal 24 and the secondary side terminal 25 are arranged above the front wall 14a of the tank 14, respectively. As described above, since the tank 14 is raised by stacking a plurality of single-phase transformers, it is easy to visually recognize by installing it on the upper side, and the switch 16, the shut-off device 18 and the like are installed in the vertical direction. By arranging them in the middle, a working space in the second storage part 17 and the third storage part 19 can be secured.

  Further, in the present embodiment, the protective plate 27 is disposed at a predetermined position on the front opening side of the third storage portion 19, for example. In other words, the protective plate 27 is disposed so as to cover the front side of the secondary side terminal 25 and suppresses the operator from touching the secondary side terminal 25 and the like by mistake when the secondary door 22 is opened. Yes. In the present embodiment, the protective plate 27 is made of a transparent member so that the secondary terminal 25 on the back side of the protective plate 27 can be seen when the secondary door 22 is opened. The protective plate 27 is detachable. When actually repairing, the worker removes the protection plate 27 and performs a predetermined operation.

  Furthermore, in this embodiment, the oil collection hole 30 is provided in the front wall 14 a of the tank 14. The oil collection hole 30 is also provided in the front wall 14a of the tank 14, so that the insulating oil outlet and the like of the combination transformer are located on the third storage portion 19 side. Further, like the secondary terminal 25, the shut-off device 18 and the like are not arranged on the front side of the oil collection hole 30. Thereby, in this embodiment, the worker opens the secondary door 22 and removes the protective plate 27, so that the oil collection hole 30 is exposed and oil can be collected.

  As described above, in the present embodiment, by opening the primary door 21 and the secondary door 22 provided on the front side of the box body 10, the primary terminal 24, the secondary terminal 25 and the oil collection hole 30 of the combination transformer are provided. Since it can be visually confirmed and various maintenance can be performed, the convenience of maintenance inspection increases. Furthermore, since maintenance can be performed from the front side of the box body 10 as described above, there is no need to provide a full-face door on the rear side of the box body 10 as in the prior art, and an area for opening and closing the full-face door is secured on the rear side. There is no need to do it. For this reason, as described above, the plane area of the box 10 can be reduced by combining a plurality of single-phase transformers up and down, and the space required for installing the high-voltage power receiving facility can be further reduced.

  In the above-described embodiment, the primary side terminal 24, the secondary side terminal 25, and the oil collection hole 30 are arranged on the front side. However, for example, the primary side terminal 24 and the secondary side terminal 25 are arranged on the front side, and the oil collection hole 30 is arranged. It is good also as a structure which does not provide.

In the above-described embodiment, no door is provided on the rear side of the box. However, for example, a small door instead of a full-face door may be provided so that the inside of the first storage unit 15 can be confirmed from the rear side.
In the above-described embodiment, the front wall 14a of the tank 14 is used as a partition wall that partitions the front and rear spaces. However, the present invention is not limited to this. For example, the partition wall may be provided as a separate member. good. In the case where the partition wall is formed of a separate member, the partition wall and the front wall 14a on the front side of the tank 14 may be brought into contact or close to each other, for example.

  In the above-described embodiment, three single-phase transformers are used to configure the combination transformer, and the rated capacity of each single-phase transformer is specified to a specific value. However, the present invention is not limited to this. There may be various settings. For example, if the rated capacities of the first single-phase transformer 11 and the third single-phase transformer 13 are both 125 kVA, the equipment unbalance rate can be further reduced to 75%. The sum of the rated capacities of the first single-phase transformer 11 and the third single-phase transformer 13 is 250 kVA, but the sum of the rated capacities may be other than 250 kVA. The rated capacity of the second single-phase transformer 12 may also be set to a value other than 50 kVA. Further, the number of combination transformers can be two or four or more.

  Moreover, although each single-phase transformer 11, 12, 13 connected between the three lines of embodiment mentioned above accommodated them in one tank 14, this invention is not limited to this, It is individual or It is good to store in a tank in arbitrary combinations. Specifically, one and two cars can be stored in two tanks, or each one can be stored in three tanks. Moreover, it is not necessary to store in a tank. It should be noted that the above-described embodiments and modifications can be implemented in appropriate combination.

DESCRIPTION OF SYMBOLS 10 Tank 11 1st single phase transformer 12 2nd single phase transformer 13 3rd single phase transformer 14 Tank 14a Front wall 15 1st accommodating part 16 Switch 17 Second accommodating part 18 Breaker 19 Third accommodating part 21 Primary door 22 Secondary door 24 Primary side terminal 25 Secondary side terminal 27 Protection plate 29 Bulkhead 30 Oil collecting hole

Claims (5)

A combination transformer that can supply power to a single-phase power supply and a three-phase power supply is stored in the box,
The plurality of single-phase transformers constituting the combination transformer are stacked one above the other,
Provide a full door on the front side of the box,
The terminal of the combination transformer is provided on the front side,
The interruption device connected to the terminal is disposed between the combination transformer and the front door,
The high-voltage power receiving facility is characterized in that the terminal is visible when the full-face door is opened. An oil collection hole of the combination transformer is provided on the front side,
2. The high-voltage power receiving facility according to claim 1, wherein the insulating oil of the combination transformer can be collected from the oil collection hole by opening the full surface door. A transparent protective member is detachably disposed on the front side of the terminal,
3. The high-voltage power receiving facility according to claim 1, wherein when the full-face door is opened, the terminal is visible through the protection member. The plurality of single-phase transformers constituting the combination transformer are housed in a tank alone or in any combination,
4. The tank according to claim 1, wherein the front wall of the tank is also used as a partition wall that separates a storage portion for storing the combination transformer and a storage portion for storing the shut-off device. The high-voltage power receiving facility described in 1. The combination transformer connects a single-phase transformer between three lines, and connects two single-phase transformers with different rated capacities in a different-capacitance V-connection system. A combination transformer that can output electric power and electric power for a three-phase load,
5. The system according to claim 1, wherein a difference between the maximum and minimum rated capacities of the single-phase transformers connected between the three lines is equal to or less than a set reference value. The high-voltage power receiving equipment described in the paragraph.

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