JP7623151B2 - Ground-mounted transformer - Google Patents

Description

The present invention relates to improvements to ground-mounted transformers that are installed on sidewalks in urban areas and other areas where power lines are underground, receive high voltage, step it down, and supply power to low-voltage consumers.

In commercial districts and busy urban areas of cities, underground power distribution systems have come to be widely adopted in place of overhead power distribution systems in order to maintain the beauty of the city and to prevent power outages and other accidents caused by the collapse of utility poles in the event of a disaster.

The electrical equipment used in the underground power distribution system is generally a ground-mounted transformer that houses high-voltage equipment, a transformer device, and a low-voltage branching device in a casing and is installed on the sidewalk.

The above-mentioned ground-mounted transformers are generally installed in a location close to the roadway on a busy sidewalk, but because the installation space is limited due to the location, they are made as small as possible and are made almost entirely sealed in a metal case, with only ventilation holes left, to prevent the intrusion of dust, dirt, moisture, etc., as well as the possibility of contacting the live part by tampering with the device by inserting metal objects such as wires from the outside.

As a result, if a short circuit or other accident were to occur on the high-voltage equipment side housed in the housing, causing a sudden rise in internal pressure within the compartment of the housing housing the high-voltage equipment, the housing could be damaged by the internal pressure or the joints of the housing could peel off if the internal pressure was not released quickly.

For this reason, conventionally, a pressure relief device has been installed to release abnormal pressure inside the housing to the outside, preventing damage to the housing, as in the ground-mounted electrical equipment (ground-mounted transformer) disclosed in Japanese Utility Model Publication No. 3-57045.

The applicant has also disclosed in Patent Document 1 below an inexpensive pressure relief device that simplifies the configuration of conventional pressure relief devices and can be installed in a narrow space inside a housing.

JP2006-129628

The ground-mounted transformer device disclosed in the above-mentioned Patent Document 1 is roughly equipped with the following pressure relief device. That is, in Figs. 5 to 7 of the above-mentioned Patent Document 1, pressure relief device A is composed of spring member 15 and stopper member 21, and is attached in pair to the upper and lower parts shown in Fig. 5 on the inside located in compartment 2b of pressure relief door 11 shown in Fig. 6.

As shown in FIG. 6 of Patent Document 1, the spring member 15 is made of a flat, horizontally elongated leaf spring, and its base end is secured to the first vertical beam 2b1 of the compartment 2b of the housing 2 using a bolt or the like, and the free end side of the tip of the leaf spring extending toward the free end side of the pressure release door 11 is attached to the pressure release door 11 by loosely fitting locking pins 17 implanted in the pressure release door 11 in the length direction of the leaf spring so that they cannot be removed.

As shown in Figures 6 and 7, the stopper member 21 is installed near the spring member 15 and consists of a support plate 22 attached to the second vertical beam 2b2 of the compartment chamber 2b, a lever body 23 pivotally attached at its base end to the support plate 22, a locking plate 24 attached to the inner surface of the pressure release door 11 facing the free end side of the tip of the lever body 23, and a horizontal hole 25 drilled in the locking plate 24 along its length. By loosely fitting an engagement pin 26 attached to the free end of the lever body 23 into the horizontal hole 25 so that it cannot be removed, the lever body 23 supports the pressure release door 11 so that the restoring force (spring pressure) of the spring member 15 is not lost when the pressure release door 11 opens beyond a certain angle, and pressure release device A is configured.

If an internal short circuit or other accident occurs in the compartment chamber 2b housing the high-voltage equipment 7 and the internal pressure of the compartment chamber 2b rises, the internal pressure will press against the entire peripheral wall of the compartment chamber 2b. However, if the internal pressure is smaller than the spring pressure of the spring member 15, the pressure relief door 11 will hardly open. However, if the internal pressure becomes higher than the spring pressure of the spring member 15, the pressure relief door 11 will be pushed open and the pressure inside the compartment chamber 2b will be released to the outside through the pressure relief port 11a.

As shown in Figure 7, the pressure relief door 11 is pivoted to the compartment 2b and opens outward from the housing 2 against the spring pressure of the spring member 15, centered on a rotating member 29 such as a hinge. When the internal pressure is released, the spring member 15 gradually curves as the locking pin 17 loosely fitted in the long hole 16 drilled at its tip moves within the long hole 16 as the pressure relief door 11 opens, as shown in Figure 5. When the locking pin 17 reaches the end of the long hole 16, the spring member 15 bends in a bow shape, as shown in Figure 7, with the stopper at its base end as a fulcrum.

In addition, as the pressure relief door 11 opens, the lever body 23 of the stopper member 21 rotates clockwise around the pivot point of the support plate 22 on which its base end is pivoted in FIG. 7, and at the same time, the tip of the lever body 23 moves to the right in FIG. 7 via the locking pin 26 within the horizontal hole 25 drilled in the locking plate 24 of the pressure relief door 11, thereby moving in conjunction with the opening of the pressure relief door 11.

Then, when the locking pin 26 at the tip of the lever body 23 reaches the end of the horizontal hole 25, the pressure relief door 11 is prevented from being opened any further beyond the dead point of the spring member 15.

The pressure relief device A described in Patent Document 1 is configured as described above, and as shown in Figures 4 and 6 of Patent Document 1, it can be installed in the narrow space located on the roadway side inside compartment 2b of housing 2, which contributes to the miniaturization of ground-mounted transformer devices.

In addition, compared to previous pressure relief devices, this device had the advantage of being simpler and less expensive to construct.

However, as mentioned above, the pressure relief device A described in Patent Document 1 requires a spring member 15 and a stopper member 21, and the spring member 15 must be made of a flat, horizontally long leaf spring, the base end of the leaf spring must be bolted to the first vertical beam 2b1, and a long hole 16 must be provided at the tip of the leaf spring, into which a locking pin 17 implanted in the pressure relief door 11 can be loosely fitted.

The stopper member 21 is composed of a support plate 22, a lever body 23, and a locking plate 24, the support plate 22 is attached to the second vertical beam 2b2, the base end of the lever body 23 is pivotally attached to the support plate 22, and an engagement pin 26 is attached to its free end. The locking plate 24 is then attached to the inside surface of the pressure relief door 11, and a horizontal hole 25 is formed in the locking plate 24, into which the engagement pin 26 is loosely fitted. This requires the preparation of many specially shaped components, which is an obstacle to reducing the manufacturing costs of the pressure relief device A.

In addition, assembling these many parts requires assembly and adjustment, which requires considerable effort, skill, and time, resulting in reduced productivity.

In view of the above-mentioned problems, the present invention aims to provide a ground-mounted transformer that can improve productivity by further reducing the number of parts that make up the pressure relief device, simplifying the configuration, and minimizing the need for assembly and adjustment.

The ground-mounted transformer described in claim 1 is a ground-mounted transformer having a casing divided into two compartments, a transformer device housed and installed in one of the compartments, the primary side of the transformer device connected via a partition to high-voltage equipment housed and installed in the other compartment of the casing, and the secondary side of the transformer device connected to a low-voltage branch device connected to the consumer side, characterized in that one of the compartments housing the transformer device is provided with a ventilation opening to the outside, a part of the partition is constructed of a gasket, and the gasket is configured to fall off without being damaged when the internal pressure in the other compartment housing the high-voltage equipment rises.

The ground-mounted transformer according to claim 2 is characterized in that the bulkhead is attached to a side surface of the tank of the transformer device according to claim 1.

The ground-mounted transformer described in claim 3 is characterized in that the gasket described in claim 1 or claim 2 is disposed between the transformer device and the inner surface of the housing.

The ground-mounted transformer described in claim 4 is characterized in that a part of the bulkhead is formed by a double-structure outer frame that sandwiches the gasket described in any one of claims 1 to 3.

The ground-mounted transformer according to claim 5 is characterized in that the gasket according to claim 4 is attached between the outer frames of the double structure by supporting one point of the gasket with a fixing member.

The ground-mounted transformer described in claim 6 is characterized in that the outer frame described in either claim 4 or claim 5 is provided with a hollow portion that allows the internal pressure of the other compartment to act on the gasket, and an attachment portion that attaches the outer frame to a fixed position.

The ground-mounted transformer described in claim 7 is characterized in that the mounting portion described in claim 6 is provided with a fixing portion.

According to the invention described in claim 1, when the internal pressure of the compartment housing the high-voltage equipment is normal, the compartment is maintained in a sealed state, and when the internal pressure of the compartment rises abnormally, the gasket attached to the partition between the compartment housing the high-voltage equipment and the compartment housing the transformer device falls off without being damaged , thereby allowing the internal pressure of the compartment housing the high-voltage equipment to escape to the compartment housing the transformer device and to be released to the outside through a ventilation hole provided in the compartment housing the transformer device, thereby reliably preventing damage to the casing of the ground-mounted transformer due to an abnormal rise in internal pressure in the compartment housing the high-voltage equipment.

According to the invention described in claim 2, since the partition wall is attached to the side surface of the tank of the transformer device, the number of parts of the pressure relief device can be reduced as much as possible, and manufacturing costs can be suppressed.

According to the invention described in claim 3, the gasket is arranged between the transformer device and the inner surface of the housing, so that the dead space within the housing can be effectively utilized to install the pressure relief device, contributing to the miniaturization of the device.

According to the invention described in claim 4, the gasket is sandwiched between a double-structured outer frame and the outer frame is fixed to the tank of the transformer device to form part of the partition, thereby eliminating the need to prepare a pressure relief device and partition separately.

According to the invention described in claim 5, when internal pressure is applied to a gasket attached between the outer frames of a double structure, the gasket can be easily removed from between the outer frames of the double structure by rotating around the support point of the fixing member.

According to the invention described in claim 6, the configuration of the pressure relief device can be simplified, so assembly and adjustment is unnecessary as much as possible, and the pressure relief device can be installed with less labor and less work time, improving productivity.

According to the invention described in claim 7, the mounting portion of the outer frame is provided with a fixing portion, so the degree of freedom of the fixing position of the outer frame can be increased.

FIG. 2 is a front view of the ground-mounted transformer of the present invention. FIG. 2 is a plan view showing the ground-mounted transformer of the present invention with the door open. FIG. 2 is a right side view of the ground-mounted transformer of the present invention. FIG. 2 is a rear view of the ground-mounted transformer of the present invention. FIG. 2 is a front view showing the inside of the ground-mounted transformer of the present invention. FIG. 2 is a left side view showing the inside of the ground-mounted transformer of the present invention. FIG. 2 is a plan view showing the inside of the ground-mounted transformer of the present invention. FIG. 2 is a perspective view showing the low voltage side of the ground-mounted transformer of the present invention. FIG. 2 is a perspective view illustrating a method for attaching a pressure relief device to a transformer constituting the low-voltage side of the ground-mounted transformer of the present invention. 1 is a left side view showing a case where a pressure relief device is attached to a transformer constituting the low voltage side of a ground-mounted transformer of the present invention. FIG. FIG. 2 is a left side view showing the state in which the transformer-mounted pressure relief device constituting the low-voltage side of the ground-mounted transformer of the present invention is activated.

Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 to 10. Fig. 1 is a front view showing a ground-mounted transformer PMT of the present invention, which is often installed and used next to a sidewalk (at the boundary with a roadway) in urban areas, etc.

In FIG. 1, 31 denotes the rectangular housing (case) of the ground-mounted transformer PMT, 32 denotes a first inspection door attached to the right side of housing 31 when viewed from the front, and 33 denotes a second inspection door attached to the left side of housing 31 when viewed from the front.

Figure 2 is a plan view of the ground-mounted transformer PMT of the present invention, showing the first inspection door 32 and the second inspection door 33 in an open state. The ground-mounted transformer PMT is installed next to the sidewalk so that the opening direction of the first inspection door 32 faces the sidewalk.

Figure 3 is a right side view of the transformer PMT, with ventilation openings 34a to 34c provided in part of the housing 31. Figure 4 is a rear view of the transformer PMT, with ventilation openings 35a to 35d provided in part of the housing 31. The ground-mounted transformer PMT is installed next to the sidewalk so that the ventilation openings 35a to 35d shown in Figure 4 are located on the roadway side.

Figure 5 is a front view showing the internal structure of the ground-mounted transformer PMT of the present invention, and Figure 6 is a left side view showing the internal structure of the transformer PMT. As shown in Figure 5, the inside of the housing 31 of the ground-mounted transformer PMT of the present invention is divided into two chambers in the width direction (left and right direction in Figure 5) by a partition wall 36.

One compartment (the right side in Figure 5) 37a of the housing 31 houses a transformer device 38 that constitutes the low-voltage side of the ground-mounted transformer PMT, and a low-voltage branch device 39 that is electrically connected to the secondary charging section of the transformer device 38 is provided in front of the transformer device 38.

40 is a low-voltage cable connected to the low-voltage branching device 39, and is connected to the consumer side via a low-voltage distribution line (not shown). 41 indicates a ground wire connected to the low-voltage branching device 39.

As shown in Figures 5 and 6, the other compartment 37b of the housing 31 houses and installs high-voltage equipment 42, which is generally composed of a switch 42a and a high-voltage cutout 42b. The high-voltage cutout 42b is connected to the high-voltage side of the transformer device 38, and the switch 42a is connected to a high-voltage side distribution line (not shown) via a high-voltage side cable 43.

When the first inspection door 32 shown in Figures 1 and 2 is opened from the front, the transformer device 38 and low-voltage branch device 39 shown in Figure 5 appear opposite, allowing an inspector to perform maintenance and inspection of these devices on the low-voltage side. Also, when the second inspection door 33 shown in Figures 1 and 2 is opened from the left side, the high-voltage equipment 42 shown in Figure 6 appears opposite, allowing an inspector to perform maintenance and inspection of the high-voltage side switch 42a and high-voltage cutout 42b.

Next, the configuration of the pressure relief device, which is a characteristic feature of the present invention, will be described. Figure 7 is a plan view showing the inside of the ground-mounted transformer PMT of the present invention. The pressure relief device of the present invention constitutes part of the partition wall 36 that forms the two compartments 37a, 37b within the housing 31.

In other words, the bulkhead 36 is roughly composed of a first pressure relief device 44 installed between the transformer device 38 and the top surface of the housing 31, a second pressure relief device 45 installed between the transformer device 38 and the rear of the housing 31 on the rear side, and a partition plate 46 installed between the transformer device 38 and the first inspection door 32 of the housing 31 on the front side.

The mounting positions of the pressure relief devices 44, 45 and the partition plate 46 are shown in the schematic (perspective) diagram of the transformer device 38 shown in FIG. 8. The first pressure relief device 44 is mounted at the upper position of the left end of the transformer device 38 when viewed from the front, the second pressure relief device 45 is mounted at the rear position of the left end of the transformer device 38 when viewed from the front, and the partition plate 46 is mounted at the front position of the left end of the transformer device 38 when viewed from the front.

The gap between the left side of the first pressure release device 44 in a side view and the upper corner of the second pressure release device 45 in a side view, the gap between the right side of the first pressure release device 44 in a side view and the upper corner of the partition plate 46 in a side view, and other gaps are fitted with blocking members (described later), which together form the partition wall 36.

Gaskets 47, 48 are attached to the center of the first pressure relief device 44 and the second pressure relief device 45, and fall off from each pressure relief device 44, 45 when the internal pressure of the high-pressure compartment 37b increases abnormally.

Next, the structure of the first pressure relief device 44, the second pressure relief device 45, and the partition plate 46, and the method of fixing them inside the housing 31 will be explained with reference to FIG. 9.

Figure 9 is an enlarged perspective view of the main parts of the transformer device 38 that constitutes the ground-mounted transformer PMT of the present invention, and shows the structure of the first and second pressure relief devices 44, 45 and partition plate 46 that are attached to it.

The first pressure relief device 44 is roughly composed of an outer frame made of two rectangular thin steel plates 49, 50 that stand upright with their longitudinal direction oriented horizontally. The two thin steel plates 49, 50 have hollow portions 51, 52 (52 is not indicated by a drawing number for drawing purposes) that are opened at the center, and mounting portions 53, 54 around them, and a gasket 47 is sandwiched between the two thin steel plates 49, 50.

The gasket 47 is securely clamped between the two thin steel plates 49, 50 by fixing them with the first fixing members 55, and is supported by one of the first fixing members 55.

In addition, of the two thin steel plates 49, 50, one of the thin steel plates 49 is attached at its lower end position with a second fixing portion 56 that protrudes to the left when the transformer device 38 is viewed from the front, and a second mounting hole 58 for mounting a second fixing member 57 is formed in the fixing portion 56.

The second fixing member 57 is composed of a second bolt 60 that protrudes upward from the upper surface (not shown) of the tank 59 of the transformer device 38, and a second nut 61 attached to the second bolt 60. The second bolt 60 protrudes upward from the upper surface of the top plate 62 through an insertion hole 63 formed in the top plate 62 that is placed on the upper surface (not shown) of the tank 59, and its main purpose is to fix the top plate 62 to the upper surface of the tank 59 of the transformer device 38.

The second pressure relief device 45 is roughly composed of an outer frame made of two thin steel plates 64, 65 that stand upright with their lengthwise direction oriented vertically. The thin steel plates 64, 65 have upper surface 66a, 66b, middle surface 67a, 67b, upper lower surface 68a, 68b at the top, short vertical surfaces 69a, 69b, inclined surfaces 70a, 70b, and long vertical surfaces 71a, 71b that connect these, and have a flat shape with lower lower surface 72a, 72b at the bottom.

The two thin steel plates 64, 65 have hollow portions 73, 74 (74 is not indicated by a drawing number for the purpose of drawing) formed by an opening in the center position, and mounting portions 75, 76 around them, and a gasket 48 is sandwiched between the two thin steel plates 64, 65.

The gasket 48 is securely held between the two thin steel plates 64, 65 by fixing it with a third fixing member 78.

Furthermore, the two thin steel plates 64, 65 have fourth mounting holes 80a, 80b (80b is not indicated in the drawing number for drawing purposes) formed between the upper lower surfaces 68a, 68b and the lower lower surfaces 72a, 72b, to which a fourth fixing member 79 is attached. The fourth fixing member 79 is attached to the edge of the side surface 59a of the tank 59 of the transformer device 38 and is composed of a fourth bolt 81 that protrudes to the side (to the left when the transformer device 38 is viewed from the front) and a fourth nut 82 that is attached to the fourth bolt 81.

The gasket 48 is supported between the two thin steel plates 64, 65 by a pair of a fourth bolt 81 and a fourth nut 82.

The partition plate 46 is made of a thin steel plate with its length oriented vertically, and has an upper surface 83 formed at its top, with a fifth mounting hole 85 formed vertically for mounting a fifth fixing member 84. The fifth fixing member 84 is attached to the edge of the side surface 59a of the tank 59 of the transformer device 38, and is composed of a fifth bolt 86 that protrudes to the side (to the left when the transformer device 38 is viewed from the front), and a fifth nut 87 attached to this.

The first pressure relief device 44 is fixed to the edge of the top plate 62 of the transformer device 38 by inserting the second bolt 60 protruding upward from the top plate 62 of the transformer device 38 into the second mounting hole 58 of the second mounting portion 56 and then fastening the second nut 61 to the second bolt 60.

The second pressure relief device 45 is fixed to the edge of the side surface 59a of the tank 59 of the transformer device 38 by inserting a fourth bolt 81 protruding laterally from the side surface 59a of the tank 59 of the transformer device 38 into the fourth mounting holes 80a, 80b, and then fastening a fourth nut 82 to the fourth bolt 81.

At this time, the upper part of the two thin steel plates 64, 65 constituting the second pressure release device 45 has the upper surface 66a, 66b and the middle surface 67a, 67b, the short vertical surfaces 69a, 69b connecting them, and the inclined surfaces 70a, 70b connecting the middle surface 67a, 67b and the long vertical surfaces 71a, 71b. Therefore, even if the top plate 62 of the transformer device 38 and the high-pressure side bushing 88 protrude laterally from the side surface 59a of the tank 59, the top plate 62 is fitted onto the middle surface 67a, 67b. In other words, the inclined surfaces 70a, 70b allow the bushing 88 to be attached in a manner that avoids the second pressure release device 45, and the second pressure release device 45 can be fixed in close contact with the side surface 59a of the tank 59.

The partition plate 46 is fixed to the opposite edge of the side surface 59a of the tank 59 of the transformer device 38 by inserting a fifth bolt 86 protruding laterally from the side surface 59a of the tank 59 of the transformer device 38 into a fifth mounting hole 85 and then fastening a fifth nut 87 to the fifth bolt 86.

At this time, since an upper surface 83 is formed on the upper part of the partition plate 46, even if the top plate 62 of the transformer device 38 protrudes laterally from the side surface 59a of the tank 59, the top plate 62 can be fitted into a position above the upper surface 83, and the partition plate 46 can be fixed tightly to the side surface 59a of the tank 59.

Figure 10 is a left cross-sectional view of the ground-mounted transformer PMT of the present invention, showing the first and second pressure relief devices 44, 45 and the partition plate 46 attached to the side surface 59a of the tank 59 of the transformer device 38. As shown in Figure 10, when the first and second pressure relief devices 44, 45 are attached, gaps that cannot be completely sealed by the pressure relief devices 44, 45 and the partition plate 46 are created in the left-right and upward positions of the first pressure relief device 44, the upward, left and downward positions of the second pressure relief device 45, and the upward, right and downward positions of the partition plate 46.

These gaps are then blocked by gasket-shaped blocking members 89a-89h to prevent them from falling out, forming the partition wall 36 shown in FIG. 5 together with the first and second pressure relief devices 44, 45 and the partition plate 46, separating the first compartment chamber 37a from the second compartment chamber 37b and making the second compartment chamber 37b into an airtight space.

Next, a situation in which the first and second pressure relief devices 44, 45 configured as described above are utilized will be described. When an internal short circuit or the like occurs in the second compartment 37b housing the high-voltage equipment 42 shown in FIG. 5, causing the air in the compartment 37b to expand and the internal pressure of the compartment 37b to abnormally increase, the internal pressure of the compartment 37b will press the inner wall surface of the housing 31 surrounding the compartment 37b outward.

At the same time, a pressing force is also applied to the partition 36 that separates the inside of the housing 31 into the first compartment 37a and the second compartment 37b, pressing the partition 36 toward the first compartment 37a. At this time, pressure is applied uniformly to the entire surfaces of the side surface 59a of the tank 59 of the transformer device 38 shown in Figure 10, the first and second pressure relief devices 44, 45, the partition plate 46, and the blocking members 89a to 89h.

Here, in the first and second pressure relief devices 44, 45, gaskets 47, 48 are sandwiched between two thin steel plates 49, 50 and between two thin steel plates 64, 65, respectively, and a part of them is visible from the hollow portions 51, 73.

Therefore, the internal pressure applied to the partition 36 rotates the gasket 47 of the first pressure relief device 44 and the gasket 48 of the second pressure relief device 45 around one first fixing member 55 or one set of fourth bolts and nuts 81, 82 as shown in Figure 11, causing them to fall out from between the two thin steel plates 49, 50 or between the thin steel plates 64, 65, opening the first compartment chamber 37a side shown in Figure 5.

As shown in FIG. 8, the first compartment 37a has ventilation openings 34a-34c on the right side of the housing 31 and ventilation openings 35a-35d on the back of the housing 31, so the pressure inside the housing 31 flows through the first compartment 37a as shown by the dotted lines in FIG. 8 and is released to the outside through the multiple ventilation openings 34a-34c and 35a-35d.

As a result, even if an abnormal increase in internal pressure occurs in the second compartment 37b, which houses the high-pressure equipment 42, the pressure can be quickly released to the outside via the 31st compartment 37a, so that problems such as damage to the housing 31 due to internal pressure or peeling of the joints of the housing 31 can be reliably prevented.

As explained above, the pressure relief device attached to the ground-mounted transformer of the present invention can drastically reduce the number of parts and simplify the structure compared to conventional pressure relief devices, which reduces the cost of the device and minimizes the need for assembly and adjustment during installation, allowing installation to be completed with less labor and time, improving productivity.

In addition, the pressure relief devices 44, 45 are constructed using the partition 36 that separates the first compartment 37a and the second compartment 37b, so there is no need to secure additional space to install the pressure relief devices 44, 45, which contributes to the miniaturization of the device.

The present invention can be applied to various electrical devices in which a sealed space is formed by a partition.

Description of the Reference Signs 31 Housing 32 First inspection door 33 Second inspection door 34a to 34c, 35a, 35d Ventilation opening 36 Partition wall 37a First compartment 37b Second compartment 38 Transformer device 39 Low voltage branch device 40 Low voltage side cable 41 Grounding wire 42 High voltage side equipment 42a Switch 42b High voltage cutout 43 High voltage side cable 44 First pressure relief device 45 Second pressure relief device 46 Partition plate 47, 48 Gasket 49, 50, 64, 65 Thin steel plate 51, 52, 73, 74 Hollow portion 53, 54, 75, 76 Mounting portion 55 First fixing member 56 Second fixing portion 57 Second fixing member 58 Second mounting hole 59 Tank 59a Tank side surface 60 Second bolt 61 Second nut 62 Top plate 63 Insertion hole 66a, 66b Upper surface 67a, 67b Middle surface 68a, 68b Upper lower surface 69a, 69b Short vertical surface 70a, 70b Inclined surface 71a, 71b Long vertical surface 72a, 72b Lower lower surface 78 Third fixing member 79 Fourth fixing member 80a, 80b Fourth mounting hole 81 Fourth bolt 82 Fourth nut 83 Fifth mounting hole 84 Fifth fixing member 85 Fifth mounting hole 86 Fifth bolt 87 Fifth nut 88 Bushings 89a to 89h Blocking member PMT Ground-mounted transformer

Claims (7)

A ground-mounted transformer having a housing divided into two compartments, a transformer device housed and installed in one of the compartments, the primary side of the transformer device connected via a partition to high-voltage equipment housed and installed in the other compartment of the housing, and the secondary side of the transformer device connected to a low-voltage branch device connected to the consumer side, characterized in that one of the compartments housing the transformer device is provided with a ventilation opening to the outside, a part of the partition is constructed from a gasket, and the gasket is configured to fall off without being damaged if the internal pressure in the other compartment housing the high-voltage equipment rises. 2. The ground-mounted transformer according to claim 1, wherein the bulkhead is attached to a side surface of a tank of the transformer device. 3. The ground-mounted transformer according to claim 1 , wherein the gasket is disposed between the transformer device and an inner surface of the housing. 4. The ground-mounted transformer according to claim 1 , wherein the gasket forms a part of the bulkhead together with a double-layered outer frame that sandwiches the gasket. 5. The ground-mounted transformer according to claim 4 , wherein the gasket is attached between the outer frames of the double structure by supporting one point of the gasket with a fixing member. A ground-mounted transformer as described in either claim 4 or claim 5, characterized in that the outer frame is composed of a hollow portion that allows the internal pressure of the other compartment to act on the gasket, and an attachment portion that attaches the outer frame to a fixed position. The ground-mounted transformer according to claim 6, characterized in that the mounting portion is configured with a fixing portion.