Balancer

Abstract

To solve a problem in a balancer which may inadvertently fail and cause a public disaster when gas in a container expands.SOLUTION: A balancer improves an unbalanced current in a distribution line having a neutral line and a plurality of voltage lines. The balancer includes a power apparatus that balances a voltage between the neutral wire and a first voltage wire and a voltage between the neutral wire and a second voltage wire. The balancer includes a container in which power apparatus is housed. The balancer includes a lid that seals an opening provided at the top of the container. The balancer has a specific part through which the gas inside the container leaks to the outside more easily than other parts in an abutting part where the container and the lid come into contact when the container and the lid are fixed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a balancer.

Background Art

[0002] For example, the single-phase three-wire power distribution system is widely used in low-voltage consumers such as small-scale stores and ordinary houses. In the single-phase three-wire power distribution system, the voltage drop and power loss due to line resistance are reduced to 1 / 4, making it more efficient than the single-phase two-wire power distribution system. Furthermore, the ability to use both 100V and 200V voltages is highly convenient for consumers, especially with the spread of relatively large-capacity electrical equipment with 200V input. However, most electrical equipment operates at 100V. The system current becomes unbalanced because a large number of electrical equipment are connected to the two systems of the single-phase three-wire system and are used unspecified. This unbalanced state deteriorates the efficiency compared to the balanced state. For areas with particularly significant unbalances on the power supply side, a special transformer called a balancer is connected.

[0003] The technology described in Patent Document 1 relates to a balancer, a low-voltage power distribution system, and a power distribution system. The technology described in Patent Document 1 is such that even if a public disaster occurs, fragments of the molded part, which is composed of an insulating solid and has a core and windings molded inside, are unlikely to scatter.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technology described in Patent Document 1, while making it less likely for fragments to scatter when dielectric breakdown occurs, cannot completely prevent scattering. On the other hand, a balancer in which a transformer is housed in a container may be able to completely prevent the scattering of components housed in the container when dielectric breakdown occurs.

[0006] When a transformer is enclosed in a container, the gas inside the container expands due to dielectric breakdown. This expansion can cause the balancer to fail unintentionally, potentially leading to a public hazard. [Means for solving the problem]

[0007] One embodiment of the present invention Mr. / Ms. To improve unbalanced currents in distribution lines having a neutral wire and multiple voltage lines. Balancer . First aspect The balancer includes a power device that balances the voltage between the neutral wire and the first voltage line with the voltage between the neutral wire and the second voltage line. First aspect The balancer includes a container that houses the power equipment. First aspect The balancer includes a lid that seals the opening located at the top of the container. The balancer of the first embodiment includes a cable that connects power equipment and a distribution line. The balancer has a specific portion in the contact area where it comes into contact with the container and the lid when they are fixed together, which is more prone to gas leaking out of the container than other parts. In the first embodiment, the cable of the balancer is led out to the outside through a hole provided in the bottom of the container. The second embodiment of the present invention is a balancer that is attached to a crossarm provided on a utility pole using a mounting bracket and improves unbalanced current in a distribution line having a neutral wire and a plurality of voltage lines. The balancer of the second embodiment includes a power device that balances the voltage between the neutral wire and the first voltage line with the voltage between the neutral wire and the second voltage line. The balancer of the second embodiment includes a container in which the power device is housed. The balancer of the second embodiment includes a lid that seals an opening provided in the upper part of the container. The balancer of the second embodiment includes a nameplate that displays information about the balancer. The balancer of the second embodiment has a specific part in the contact portion that comes into contact with the container when the container and the lid are fixed together, which is more prone to leakage of gas from inside the container to the outside than other parts. The contact portion of the balancer of the second embodiment is provided along the edge of the opening and has three or more fastening parts arranged in the circumferential direction of the contact portion. In the second embodiment, the container and lid of the balancer are secured together using fasteners at multiple fastening points. The specific portion of the balancer in the second embodiment is the portion between two adjacent fastening points in the circumferential direction, and is wider apart than the other portion between two adjacent fastening points in the circumferential direction. Fasteners that do not correspond to the specific portion of the balancer in the second embodiment are also used to secure the balancer to the mounting bracket. Fasteners that correspond to the specific portion of the balancer in the second embodiment are not used to secure the balancer to the mounting bracket. One of the two fasteners used to secure the balancer to the mounting bracket in the second embodiment is also used to secure the nameplate. [Brief explanation of the drawing]

[0008] [Figure 1] This is an external perspective view showing an example of the Balancer 100. [Figure 2] This is a bottom view showing an example of the Balancer 100. [Figure 3] This is a top view showing an example of a state in which the transformer 110 is housed in the container 120. [Figure 4] This is a top view showing an example of a transformer 110 housed in a container 120 and embedded in a molded insulator 150. [Figure 5] This is a cross-sectional view showing an example of a VV cross-section of container 120. [Figure 6]This is a plan view showing an example of lid 130. [Figure 7] This figure shows an example of how to use Balancer 100. [Figure 8] This figure shows an example of how information about Balancer 100 is displayed. [Modes for carrying out the invention]

[0009] The present invention will be described below through embodiments, but these embodiments are not intended to limit the invention as defined in the claims. Furthermore, not all combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0010] Figure 1 is an external perspective view showing an example of the balancer 100. Figure 2 is a bottom view showing an example of the balancer 100. Figure 3 is a top view showing an example of the transformer 110 housed in the container 120. Figure 4 is a top view showing an example of the transformer 110 housed in the container 120 embedded in the molded insulator 150. Figure 5 is a cross-sectional view showing an example of a VV cross-section of the container 120. Figure 6 is a plan view showing an example of the lid 130. Figure 7 is a diagram showing an example of the balancer 100 in use.

[0011] This embodiment describes a balancer 100 that improves unbalanced current in a single-phase three-wire distribution line PL. A single-phase three-wire distribution line PL has a first voltage line PL1, a second voltage line PL2, and a neutral line PL3. A single-phase three-wire distribution line PL can utilize 100 volts by using the neutral line PL3 and either the first voltage line PL1 or the second voltage line PL2. A single-phase three-wire distribution line PL can utilize 200 volts by using the first voltage line PL1 and the second voltage line PL2.

[0012] The balancer 100 comprises a transformer 110, a container 120, and a lid 130.

[0013] The transformer 110 is a device that balances the voltage between the neutral line PL3 and the first voltage line PL1, and the voltage between the neutral line PL3 and the second voltage line PL2. The transformer 110 includes a core (not shown) and two windings. The core is, for example, a ring core. The turns ratio of the two windings is 1:1. The transformer 110 is connected to three cables that connect the transformer 110 and the distribution line PL. The first cable 141 is connected to an end point of one winding in the transformer 110. The second cable 142 is connected to an end point of the other winding in the transformer 110. The third cable 143 is connected to the neutral point in the transformer 110. The transformer 110 is an example of electrical equipment.

[0014] The container 120 is a component that houses the transformer 110. The container 120 has an opening 121 at the top. The container 120 has three holes 122 at the bottom. The transformer 110 is housed in the container 120 through the opening 121. The three cables connected to the transformer 110 are each drawn out to the outside through individual holes 122.

[0015] The transformer 110 is embedded in the molded insulator 150. The molded insulator 150 is mainly provided to cool the transformer 110 and also has the effect of fixing and insulating the transformer 110. Obtaining a cooling effect by using a filling resin is itself a well-known technique. The molded insulator 150 is, for example, an insulator formed by curing an epoxy resin-based polymer substance into a mold shape. The epoxy resin for forming the molded insulator 150 is filled into the container 120 through the opening 121.

[0016] The container 120 includes three legs 123 that extend downward from the bottom surface. By including the legs 123, when the container 120 is placed on the ground, the bottom surface is in a floating state from the ground. Since the bottom surface of the container 120 floats from the ground when the balancer 100 is placed on the ground, it can be stored without damaging the cables.

[0017] The container 120 includes a grounding terminal 124 that protrudes downward from the bottom surface. The length of the grounding terminal 124 is shorter than the length of the leg portion 123. Since the grounding terminal 124 does not contact the ground when the container 120 is placed on the ground, damage can be prevented in the process of manufacturing the balancer 100.

[0018] The container 120 includes a first flange 126 provided along the edge 125 of the opening 121 and protruding outward from the outer periphery of the edge 125 in plan view. The lid 130 is a component that seals the opening 121 of the container 120. The lid 130 includes a second flange 131 on its outer peripheral portion in plan view. The first flange 126 and the second flange 131 abut when the container 120 and the lid 130 are fixed. The first flange 126 and the second flange 131 are an example of an abutting portion.

[0019] The first flange 126 has a first bolt hole BH1, a second bolt hole BH2, a third bolt hole BH3, a fourth bolt hole BH4, a fifth bolt hole BH5, and a sixth bolt hole BH6. The six bolt holes are provided side by side in the circumferential direction of the first flange 126. Similarly, the second flange 131 has a first bolt hole BH1, a second bolt hole BH2, a third bolt hole BH3, a fourth bolt hole BH4, a fifth bolt hole BH5, and a sixth bolt hole BH6. The bolt holes in the second flange 131 are provided at positions that overlap the bolt holes in the first flange 126 in plan view when the container 120 and the lid 130 are fixed. The bolt holes in the first flange 126 and the second flange 131 are an example of a fastening portion.

[0020] The container 120 and the lid 130 are fastened together using bolts and nuts through six bolt holes in the first flange 126 and the second flange 131. The first bolt B1 is inserted into the first bolt hole BH1 in the first flange 126 and the second flange 131 and, together with the first nut N1, fastens the first flange 126 and the second flange 131. The second bolt B2 is inserted into the second bolt hole BH2 in the first flange 126 and the second flange 131 and, together with the second nut N2, fastens the first flange 126 and the second flange 131. The third bolt B3 is inserted into the third bolt hole BH3 in the first flange 126 and the second flange 131 and, together with the third nut N3, fastens the first flange 126 and the second flange 131. The fourth bolt B4 is inserted into the fourth bolt hole BH4 in the first flange 126 and the second flange 131, and together with the fourth nut N4, fastens the first flange 126 and the second flange 131. The fifth bolt B5 is inserted into the fifth bolt hole BH5 in the first flange 126 and the second flange 131, and together with the fifth nut N5, fastens the first flange 126 and the second flange 131. The sixth bolt B6 is inserted into the sixth bolt hole BH6 in the first flange 126 and the second flange 131, and together with the sixth nut N6, fastens the first flange 126 and the second flange 131. The bolts and nuts are examples of fasteners.

[0021] The distance between the first bolt hole BH1 and the second bolt hole BH2, and the distance between the fourth bolt hole BH4 and the fifth bolt hole BH5 are wider than the distance between the second bolt hole BH2 and the third bolt hole BH3. Similarly, the distance between the first bolt hole BH1 and the second bolt hole BH2, and the distance between the fourth bolt hole BH4 and the fifth bolt hole BH5 are wider than the distance between the third bolt hole BH3 and the fourth bolt hole BH4. Similarly, the distance between the first bolt hole BH1 and the second bolt hole BH2, and the distance between the fourth bolt hole BH4 and the fifth bolt hole BH5 are wider than the distance between the fifth bolt hole BH5 and the sixth bolt hole BH6. Similarly, the distance between the first bolt hole BH1 and the second bolt hole BH2, and the distance between the fourth bolt hole BH4 and the fifth bolt hole BH5 are wider than the distance between the sixth bolt hole BH6 and the first bolt hole BH1. The first bolt hole BH1 is an example of the first fastening portion. The second bolt hole BH2 is an example of the second fastening portion. The portion between the first bolt hole BH1 and the second bolt hole BH2 is an example of a specific portion. The portion between the fourth bolt hole BH4 and the fifth bolt hole BH5 is an example of a specific portion. The portion between the second bolt hole BH2 and the third bolt hole BH3 is an example of another portion. The portion between the third bolt hole BH3 and the fourth bolt hole BH4 is an example of another portion. The portion between the fifth bolt hole BH5 and the sixth bolt hole BH6 is an example of another portion. The portion between the sixth bolt hole BH6 and the first bolt hole BH1 is an example of another portion.

[0022] If the bolt holes in the first flange 126 and the second flange 131 were equally spaced, dielectric breakdown could occur, causing the gas inside the container to expand, potentially leading to the lid 130 detaching from the container 120 unintentionally. On the other hand, in this embodiment, the spacing between the first bolt hole BH1 and the second bolt hole BH2, and the specific portion between the fourth bolt hole BH4 and the fifth bolt hole BH5, are wider than the spacing between other portions of adjacent bolt holes in the circumferential direction. The expanded gas inside the container is prone to leaking to the outside from these specific portions. The balancer 100 does not affect the tightening of other bolts and nuts even if the tightening of bolts and nuts in these specific portions loosens due to the leakage of expanded gas inside the container to the outside. Therefore, the lid 130 will not detach from the container 120 unintentionally.

[0023] The balancer 100 is attached to the crossarm WF installed on the utility pole using a mounting bracket MB. The mounting bracket MB comprises a hanger MB1 and a hanger seat MB2. The hanger MB1 has two bolt holes. The hanger seat MB2 has four bolt holes. The mounting bracket MB is fixed to the crossarm WF using hanger bolts HB and hanger nuts HN via the two bolt holes in the hanger MB1 and hanger seat MB2.

[0024] The balancer 100 is fixed to the hanger seat MB2 using a third bolt B3 and a sixth bolt B6 that do not correspond to specific parts. The third bolt B3 is inserted into the bolt hole of the hanger seat MB2, and then, via spacer S1, into the third bolt hole BH3 in the first flange 126 and the second flange 131. The sixth bolt B6 is inserted into the bolt hole of the hanger seat MB2, and then, via spacer S1, into the sixth bolt hole BH6 in the first flange 126 and the second flange 131. In other words, the third bolt B3 and the sixth bolt B6 that do not correspond to specific parts are used to fix the balancer 100 to the hanger seat MB2. On the other hand, the first bolt B1, the second bolt B2, the fourth bolt B4, and the fifth bolt B5 that correspond to specific parts are not used to fix the balancer 100 to the hanger seat MB2. Therefore, even if the tightening of bolts and nuts in a specific part loosens due to gas leaking from the expanded container to the outside, the balancer 100 will not detach from the mounting bracket MB.

[0025] Figure 8 shows an example of displaying information about the balancer 100. The balancer 100 includes a nameplate 160 and a display unit 127.

[0026] The nameplate 160 is a metal or other plate with information about the balancer 100 engraved on it. The nameplate 160 has a first plate surface with information about the balancer 100 engraved on it, and a second plate surface perpendicular to the first plate surface. The second plate surface has bolt holes. The nameplate 160 is fixed using a sixth bolt B6 which is used to fix the balancer 100 and the mounting bracket MB. The sixth bolt B6 is inserted into the bolt hole of the nameplate 160 and then into the bolt hole of the hanger seat MB2. Therefore, the nameplate 160 will not come off even if the tightening of bolts and nuts in a specific part loosens due to gas leaking out of the expanded container.

[0027] The display unit 127 is a painted portion on the side of the container 120 that displays the capacity of the balancer 100. The display unit 127 is positioned facing the nameplate 160. Since the nameplate 160 and the display unit 127 are visible from the same direction on the side, workers can simultaneously check the nameplate 160 and the display unit 127 when inspecting the balancer 100.

[0028] The container 120 is gray. On the other hand, the display unit 127 is red. Because the container 120 and the display unit 127 are different colors, when inspecting the balancer 100, the worker can easily locate the nameplate 160 by relying on the display unit 127. Gray is an example of the color of the container 120. Red is an example of the color of the display unit 127.

[0029] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiments. It will be clear from the claims that such modified or improved forms may also be included in the technical scope of the present invention.

[0030] The balancer 100 in the above embodiment improves unbalanced current in a single-phase three-wire distribution line PL. The balancer 100 can be any device that improves unbalanced current in a distribution line PL having a neutral wire PL3 and multiple voltage lines, and is not limited to applications to a single-phase three-wire distribution line PL. The balancer 100 is applicable to a three-phase three-wire distribution line PL. The balancer 100 is applicable to a three-phase four-wire distribution line PL.

[0031] The balancer 100 in the above embodiment includes a transformer 110. The balancer 100 is not limited to a configuration that includes a transformer 110, as long as it includes power equipment that balances the voltage between the neutral line PL3 and the first voltage line PL1 with the voltage between the neutral line PL3 and the second voltage line PL2. For example, the balancer 100 may include a converter as power equipment.

[0032] In the above embodiment, the balancer 100 is provided with a first flange 126 on the outside of the edge 125 of the opening 121 in a plan view. The balancer 100 only needs to have a contact portion that contacts the container 120 and the lid 130 when they are fixed together, and is not limited to a configuration in which the first flange 126 is provided on the outside of the edge 125 of the opening 121 in a plan view. For example, the balancer 100 may have a flange on the inside of the edge 125 of the opening 121 in a plan view.

[0033] In the above embodiment, the container 120 has three holes 122 at its bottom. The container 120 only needs to have holes 122 through which the cables connected to the transformer 110 can be pulled out to the outside, and is not limited to having three holes 122. The container 120 may have, for example, two holes 122: one for pulling out the first cable 141 and the second cable 142 together to the outside, and another for pulling out the third cable 143 to the outside. The container 120 may have, for example, one hole 122 through which the first cable 141, the second cable 142, and the third cable 143 can be pulled out together to the outside.

[0034] The container 120 in the above embodiment has three legs 123. The container 120 only needs to have legs 123 that lift its bottom surface off the ground when placed on the ground, and is not limited to having three legs 123. For example, the container 120 may have four or more legs 123. [Explanation of symbols]

[0035] 100 Balancer 110 Transformer 120 containers 121 Opening 122 Hole 123 Legs 124 Ground terminal 125 Edge 126 First Flange 127 Display section 130 Lid 131 Second flange 141 Cable No. 1 142 Second Cable 143 Third Cable 150 Molded Insulators 160 Nameplate B1 1st bolt B2 2nd bolt B3 Third bolt B4 4th bolt B5 5th bolt B6 6th bolt BH1 First bolt hole BH2 2nd bolt hole BH3 Third bolt hole BH4 4th bolt hole BH5 5th bolt hole BH6 6th bolt hole HB Hanger Bolt HN Hanger Nut MB mounting hardware MB1 Hanger MB2 Hanger Seat N1 First Nut N2 Second Nut N3 Third Nut OFF4 4th nut N5 5th nut N6 6th nut PL distribution line PL1 First voltage line PL2 Second Voltage Line PL3 Neutral wire S1 Spacer WF arm gold

Claims

1. A balancer that improves unbalanced current in a distribution line having a neutral line and multiple voltage lines, A power device that balances the voltage between the neutral wire and the first voltage line with the voltage between the neutral wire and the second voltage line, A container in which the aforementioned power equipment is housed, A lid that seals the opening provided at the top of the container, The system includes a cable connecting the power equipment and the power distribution line, In the contact portion where the container and the lid come into contact when they are fixed together, there is a specific portion that is more prone to gas leaking from inside the container to the outside than other parts, The cable is pulled out to the outside through a hole provided in the bottom of the container, forming a balancer.

2. A balancer that is attached to a crossarm provided on a utility pole using a mounting bracket, and improves unbalanced current in a distribution line having a neutral wire and a plurality of voltage lines, A power device that balances the voltage between the neutral wire and the first voltage line with the voltage between the neutral wire and the second voltage line, A container in which the aforementioned power equipment is housed, A lid that seals the opening provided at the top of the container, It includes a nameplate that displays information about the balancer, In the contact portion where the container and the lid come into contact when they are fixed together, there is a specific portion that is more prone to gas leaking from inside the container to the outside than other parts, The abutment portion is provided along the edge of the opening and has three or more fastening portions arranged in the circumferential direction of the abutment portion. The container and the lid are fixed together using fasteners at a plurality of fastening points. The aforementioned specific portion is the portion between the first and second adjacent fastening portions in the circumferential direction, and is wider in spacing than the other portion between the two adjacent fastening portions in the circumferential direction. The fasteners that do not correspond to the aforementioned specific parts are also used to secure the balancer to the mounting bracket. The fastener corresponding to the aforementioned specific part is not used for both fixing the balancer and the mounting bracket. One of the two fasteners used to secure the balancer and the mounting bracket is also used to secure the nameplate, the balancer.

3. The abutment portion is provided along the edge of the opening and has three or more fastening portions arranged in the circumferential direction of the abutment portion. The container and the lid are fixed together using fasteners at a plurality of fastening points. The balancer according to claim 1, wherein the specified portion is the portion between adjacent first and second retaining portions in the circumferential direction, and the spacing is wider than the other portion between the two adjacent retaining portions in the circumferential direction.

4. The aforementioned power equipment is embedded in a molded insulator. The balancer according to claim 1 or claim 2, wherein when dielectric breakdown occurs, the gas inside the container expands and leaks to the outside from the specific portion.

5. The system includes a cable connecting the aforementioned power equipment and the aforementioned power distribution line. The balancer according to claim 2, wherein the cable is pulled out to the outside through a hole provided in the bottom of the container.

6. The balancer according to claim 1 or claim 5, comprising three or more legs provided on the bottom surface of the container and extending downward.

7. The container is provided with a grounding terminal located on its bottom surface and protruding downwards, The balancer according to claim 6, wherein the length of the grounding terminal is shorter than the length of the leg portion.

8. It is attached to the crossarm installed on the utility pole using mounting brackets. The fasteners that do not correspond to the aforementioned specific parts are also used to secure the balancer to the mounting bracket. The balancer according to claim 3, wherein the fastener corresponding to the specified portion is not used for both fixing the balancer and the mounting bracket.

9. It is equipped with a nameplate that displays information about the balancer, The balancer according to claim 8, wherein one of the two fasteners used to secure the balancer and the mounting bracket is also used to secure the nameplate.

10. The container is provided with a display unit on its side that shows the capacity of the balancer, The balancer according to claim 2 or claim 9, wherein the display unit is provided in the direction facing the nameplate.

11. The balancer according to claim 10, wherein the color of the display unit is different from the color of the container.

12. The balancer according to claim 1 or claim 2, wherein the power equipment includes a transformer.

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