JP2012160624A - Mobile transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mobile transformer capable of sliming an installation space of the mobile transformer including a cable head, and sharply decreasing labours required for installing the cable head.SOLUTION: A center relay member 307 which can support a center cable head 351 connected to a center bushing 203 of a transformer 202 mounted on a base 201 which can be towed by a vehicle 101, at an upper part is vertically fixed to the base 201. Both-side relay member 303 capable of supporting both-side cable heads 351 connected to bushings 203 on both sides of the transformer 202 at the upper part are attached to the base 201 so as to rotate about a vertical axis. The both-side relay members 303 set a regulation observance range which positions a pair of the both-side cable heads 351 at a position exceeding an insulation distance between a regulated interphase and the both-side cable heads 351 and between the ground and the both-side cable heads 351, in a rotation area.

Description

  The present invention relates to a moving transformer that can be moved to a desired place by being pulled by a vehicle.

  In the substation, when a transformer breaks down or cannot be used due to repairs, the mobile transformer is sometimes brought into the premises and temporarily used as a pinch hitter of the original transformer. Patent Document 1 discloses an example of such a moving transformer.

  For example, as shown in FIG. 5, a conventional transformer for movement as disclosed in Patent Document 1 is connected to a loading platform 102 of a vehicle 101 such as a truck traveling on the ground G, and is pulled by the vehicle 101 to generate power. It is brought into the substation premises. In FIG. 5, MB is a transformer for movement. The moving transformer MB carried into the premises is separated from the vehicle 101 at a desired position and temporarily installed at that position. And in the installation position, the terminal part 204 of the three-phase bushing 203 with which the transformer 202 mounted in the base 201 is connected is used, for example to a circuit breaker (not shown). At this time, it may be connected to an existing circuit breaker installed in the power generation substation or may be connected to a moving circuit breaker (see Patent Document 2). It depends on the situation.

  However, it is rare that the mobile transformer MB can be installed anywhere in the substation due to restrictions on the carry-in space and installation space. Rather, it is generally said that it will be installed at the desired location. However, the precondition “as much as possible” is often imposed. For this reason, if the mobile transformer MB can be installed in a location close to the circuit breaker, the two are connected via lead wires, whereas the mobile transformer MB is installed far away from the circuit breaker. In this case, both are connected via a cable. The cable head for relay is active at this time.

  For example, as shown in FIG. 6, the relay cable head is used by being attached to a base 401. The gantry 401 is formed of a strong metal frame structure 402, and is a heavy object that does not move slightly. The cable head 403 attached to the frame structure 402 relays between the moving transformer MB and the circuit breaker. That is, the cable head 403 includes a terminal portion 404 that can be connected to the terminal portion 204 of the bushing 203 of the moving transformer MB via the lead wire 501, and includes a cable 502 that is electrically connected to the terminal portion 404. Therefore, the connection between the moving transformer MB and the circuit breaker is relayed by connecting the cable 502 to the circuit breaker.

JP 2004-221333 A JP 09-066554 A

  As can be seen from FIG. 6, the gantry 401 that supports the cable head 403 is large and heavy. Although it can't be done to prevent falling, it is not only difficult to carry, but also difficult to secure installation space. Of particular concern is the conflict between the insulation distance between the phases and between the ground and the installation space. In other words, since the insulation distance between the phases and the ground is legally determined according to the magnitude of the voltage to be handled, each electric power company has established rules for complying with this. In general, it is often operated more strictly than legal regulations. For this reason, if it is going to arrange | position the cable head 403 while ensuring a prescription | regulation insulation distance, the installation space for the mount frame 401 will no longer be able to be taken. In that case, the vehicle 101 that has once returned must come again and the moving transformer MB must be re-installed, which not only wastes time but also costs money.

  Another problem is that it is cumbersome and difficult to determine the installation position of the cable head 403 and install the mount 401 at that position. As described above, the cable head 403 must be installed with a specified insulation distance. However, there is no mechanical constraint between the moving transformer MB and the gantry 401 that supports the cable head 403. For this reason, it is necessary to install the gantry 401 while measuring whether or not the cable head 403 has a specified insulation distance each time, which is a complicated and difficult work. At this time, the size and weight of the gantry 401 further increase the work load.

  The present invention has been made in view of the above points, and can reduce the installation space of the moving transformer including the cable head for relay, and the labor required for installing the cable head for relay. It aims at obtaining the transformer for movement which can reduce drastically.

  The moving transformer of the present invention includes (1) a transformer installed on a base that can be pulled by a vehicle, and (2) a shape that extends obliquely upward and is orthogonal to the length direction that is the front-rear direction of the base. Three bushings arranged in the width direction to be connected to the three-phase conductors drawn from the transformer, and (3) attached in a form extending upward to the base so as to face the bushing in the middle A central relay member capable of supporting the central cable head connected to the middle bushing on the upper part; and (4) a base relay member attached to the base so as to be rotatable about a vertical axis and rotating relative to each other. A pair of first arms that are displaced to a storage position extending in the vertical direction and a use position extending in the width direction of the base, and provided in a form extending upward from these first arms. And a pair of second arms capable of supporting a pair of both-side cable heads respectively connected to the bushings on both sides, and a predetermined phase between the pair of first arms in the rotation region. And a double-sided relay member that sets a prescribed compliance range in which the pair of both-side cable heads are positioned at a position beyond the insulation distance between the ground and the ground.

  According to the present invention, the cable head (central cable head, both side cable head) can be supported by the relay member (central relay member, both side relay member) without providing a large object such as a gantry. The installation space for moving transformers can be reduced, and the cable heads (central cable heads and cable heads on both sides) can be quickly and properly simply by rotating a pair of both-side relay members and positioning them within a specified range. Therefore, the labor required for the installation can be drastically reduced.

The side view which shows the transformer for a movement attached to the vehicle as one Embodiment (The state where the 1st arm was the shortest in the accommodation position). The top view of the transformer for a movement shown in FIG. As an embodiment, (a) is a side view showing a moving transformer attached to a vehicle (the first arm is extended in the storage position), and (b) is shown in FIG. 3 (a). The top view of a transformer for movement. As an embodiment, (a) is a side view showing a moving transformer attached to a vehicle (first arm is a use position), and (b) is a moving transformer shown in FIG. 4 (a). Plan view. The side view which shows the transformer for a movement attached to the vehicle as an example of the past. The top view which shows the transformer for a movement shown in FIG. 5 with three cable heads.

  An embodiment will be described with reference to FIGS. 1 to 4A and 4B.

  As shown in FIGS. 1 and 2, the moving transformer MB is attached to a loading platform 102 of a vehicle 101 such as a truck traveling on the ground G and can be pulled by the vehicle 101. Needless to say, the main body of the transfer transformer MB is the transformer 202. The transformer 202 is mounted on a base 201 that can be pulled by the vehicle 101. The base 201 has a length direction in the front-rear direction of pulling by the vehicle 101 and a width direction in a direction orthogonal to the length direction, and is configured by combining the frame 211 and the moving vehicle 301. The frame 211 is a structure on which the transformer 202 is mounted, and the front portion in the length direction of the base 201 is connected to and supported by the loading platform 102 of the vehicle 101, and the rear portion in the length direction of the base 201 is connected to the moving vehicle 301. Being supported. A portion connected to the loading platform 102 is a vehicle connecting portion 212, and a portion connected to the moving vehicle 301 is a moving vehicle connecting portion 213. The vehicle connecting portion 212 is connected to the loading platform 102 of the vehicle 101 so as to be rotatable about the vertical axis, and thereby, the vehicle 101 can be turned around. On the other hand, the moving vehicle connection part 213 is fixed to the moving vehicle 301 in a rigid manner. The mobile vehicle 301 includes four sets of two tires 302 and is driven by the vehicle 101. In the frame 211, the portion between the vehicle connecting portion 212 and the moving vehicle connecting portion 213 is one step lower, and the transformer 202 is mounted on this portion.

  The transformer 202 includes three bushings 203. These bushings 203 are arranged on the rear side in the longitudinal direction of the base 201 and are arranged in the width direction of the base 201 in a form extending obliquely upward. The middle bushing 203 is arranged with an inclination angle of about 45 degrees with respect to the ground G, and the bushings 203 on both sides are arranged with an inclination angle larger than that. The bushings 203 are respectively connected to three-phase conducting wires (not shown) drawn from the transformer 202, and these conducting wires are respectively conducted to terminal portions 204 provided at the tip portions.

  A characteristic point of the moving transformer MB according to the present embodiment is that a support structure for the cable head 351 (central cable head, both-side cable head) is provided (see FIG. 4A). This support structure includes a pair of both-side relay members 303 and one central relay member 307.

  The central relay member 307 is attached to the base 201 so as to face the bushing 203 in the middle of the transformer 202 and extend upward. More specifically, the central relay member 307 is formed by, for example, a metal pipe-like member or a rod-like member fixed to the moving vehicle 301 and standing vertically. Such a central relay member 307 is a mounting body 308 having an upper portion formed in a thin flat plate shape, and the cable head 351 can be detachably attached to this portion (FIG. 4A). reference). The cable head 351 is an insulator that has a terminal portion 352 at the top and draws out a cable 354 that is electrically connected to the terminal portion 352 from the bottom, and has a bracket 353 below. The cable head 351 can be attached to the central relay member 307 by bolting the bracket 353 to the mounting body 308 of the central relay member 307. That is, both the mounting body 308 and the bracket 353 are formed with a pair of left and right bolt holes (not shown), and these bolt holes are used to fasten both of them with two bolts (not shown). That is why. The bolt hole on the mounting body 308 is formed in a long hole shape that is long in the horizontal direction so that it can be adapted to the position of the bolt hole on the bracket 353 side of the various cable heads 351 that differ for each manufacturer and type. ing. The mounting structure 308 is formed in a thin flat plate shape in order to facilitate the passage of bolts (not shown) for bolting.

  Here, the cable head 351 supported by the central relay member 307 is referred to as a central cable head 351. The central cable head 351 is connected to the middle bushing 203 via a lead wire (not shown). In this case, the terminal portion 204 of the bushing 203 and the terminal portion 352 of the central cable head 351 are connected via a lead wire.

  The both-side relay member 303 includes a first arm 304 and a second arm 306 that form a pair.

  The pair of first arms 304 are attached to a frame 211 forming the base 201 so as to be rotatable around a vertical rotation axis forming a common rotation center C. The rotation center C is positioned on a vertical line passing through the terminal portion 204 provided in the middle bushing 203. The pair of first arms 304 rotate in relation to each other, so that the storage position (see FIGS. 1 to 3A and 3B) extending in the length direction of the base 201 and the width direction of the base 201 And a use position (see FIG. 4) extending to the position. The pair of first arms 304 has a telescopic member 305 at the tip thereof. The elastic member 305 expands and contracts the length of the first arm 304.

  The pair of second arms 306 are fixed to the first arm 304 and provided so as to extend upward. More specifically, the second arm 306 is formed by a metal pipe-like member that is fixed to the distal end of the expansion / contraction member 305 and stands vertically. The pair of second arms 306 is a mounting body 308 having an upper portion formed in a thin flat plate shape, and the cable head 351 can be detachably attached to this portion (FIG. 4). (See (a)). The attachment structure between the both-side relay member 303 and the cable head 351 is the same as the attachment structure between the central relay member 307 and the cable head 351 (central cable head 351).

  Here, the cable head 351 supported by the both-side relay member 303 is referred to as a both-side cable head 351. Although the thing is the same thing as the central cable head 351, it distinguishes notionally as needed. The cable heads 351 on both sides are connected to the bushings 203 on both sides via lead wires (not shown). In this case, the terminal portion 204 of the bushing 203 and the terminal portion 352 of the both-side cable head 351 are connected via a lead wire.

  As shown in FIGS. 3A and 3B, the first arm 304 can elongate the entire length by pulling out the elastic member 305. This structure is realized by a nested structure of the first arm 304. That is, the portion that forms the base of the first arm 304 is, for example, a metal pipe-like member, and the elastic member 305 is slidably inserted and held in this portion. The elastic member 305 is also formed of, for example, a metal pipe-like member or rod-like member. Such a first arm 304 is set to a length that does not protrude from the rear end of the moving vehicle 301 on the horizontal projection surface of the base 201 when the telescopic member 305 is pushed to the shortest. (See FIG. 2).

  As shown in FIGS. 4A and 4B, the first arm 304 is displaced to a use position extending in the width direction of the base 201 by rotating with each other. At this time, the both-side relay member 303 sets a prescribed compliance range in which the pair of both-side cable heads 351 are positioned at positions that exceed the prescribed insulation distance between the phases and the ground in the rotation region of the pair of first arms 304. be able to. This will be described in detail.

As shown in FIG. 4B, the transformer 202 has a right angle at the rear corner. For this reason, it is necessary to take a prescribed ground-to-ground insulation distance so that there is no danger of a ground fault between the both-side cable head 351 supported by the both-side relay member 303. In FIG. 4B, this ground-to-ground insulation distance is shown as a distance l ₁ . Further, it is necessary to provide a specified interphase insulation distance between the both-side cable head 351 supported by the both-side relay member 303 and the terminal portion 204 of the middle bushing 203. In FIG. 4B, this interphase insulation distance is shown as a distance l ₂ . Furthermore, it is necessary to provide a prescribed inter-phase insulation distance between the both-side cable head 351 supported by the both-side relay member 303 and the central cable head 351 supported by the center relay member 307. In FIG. 4B, this interphase insulation distance is shown as a distance l ₃ .

Therefore, the both-side cable head 351 supported by the both-side relay member 303 must be disposed at a position exceeding the ground-to-ground insulation distance l ₁ and the inter-phase insulation distances l ₂ and l ₃ . This is schematically shown in FIG. 4 (b). That is, the rotation center C of the pair of both-side relay members 303 is positioned on a vertical line passing through the terminal portion 204 provided in the middle bushing 203. For this reason, when the both-side cable head 351 supported by the both-side relay member 303 is positioned at the position of the circular arc of the distance l ₂ centering on the vertical line (= rotation center C) passing through the terminal portion 204, the both-side relay member This coincides with the movement trajectory of the both-side cable head 351 accompanying the rotation of 303. Therefore, with respect to this arc (for convenience, this arc is referred to as a reference arc), a prescribed compliance range is considered so that the pair of both-side cable heads 351 can be positioned beyond the prescribed insulation distance between the phases and the ground. . Then, the distance l ₁ from the central cable head 351 supported by the central relay member 307 and the point P _{1 where} the arc having a distance l ₁ from the rear corner of the transformer 202 (for convenience, this arc is referred to as a ground-to-ground arc) intersects the reference arc. A range between the point P2 where the _three arcs (for convenience, this arc is referred to as an interphase arc) intersects the reference arc is the prescribed observance range on the reference arc. Furthermore, a region outside the region surrounded by the reference arc, the ground arc, and the interphase arc is a prescribed compliance range set in the rotation region of the pair of first arms 304. Therefore, in the transformer for movement MB of the present embodiment, the dimensions of the both-side relay member 303 are determined so that the prescribed compliance range can be set in the rotation region of the pair of first arms 304.

  Hereinafter, the unique structures provided in the both-side relay member 303 will be introduced in order.

(1) Fixing structure of the expansion / contraction position of the first arm 304 The first arm 304 can fix the position of the expansion / contraction member 305 to have a desired expansion / contraction length.

  As an example of such a structure, it is possible to pierce the base portion of the first arm 304 and the elastic member 305 with a rod-like member (not shown). In this case, the base portion of the first arm 304 is provided with only one hole (not shown) for penetrating the rod-like member, and the telescopic member 305 has a hole (not shown) for penetrating the rod-like member. A plurality of arms 304 are provided along the expansion / contraction direction of one arm 304. As a result, the length of the first arm 304 can be varied in multiple stages by the number of holes provided in the telescopic member 305, and the telescopic position of the first arm 304 can be fixed at each stage position.

  As another example, a structure in which the movement of the expansion / contraction member 305 is regulated by a friction member (not shown) that is displaced from the inner surface of the base portion of the first arm 304 toward the expansion / contraction member 305 may be employed. In this case, the friction member is biased in advance in the operation restricting direction by a spring (not shown), and the friction member is moved in the direction opposite to the operation restricting direction by an operation from the outside of the first arm 304, A structure for releasing the restriction can be adopted. Thereby, the length of the first arm 304 can be changed steplessly, and the expansion / contraction position of the first arm 304 can be fixed steplessly.

  Note that the structure for fixing the expansion / contraction position of the first arm 304 described above is not necessarily an indispensable configuration, and this may not be provided in the implementation.

(2) Restriction structure of expansion / contraction range of first arm 304 The both-side relay member 303 has a pair of both-side cable heads 351 at a position where the expansion / contraction position of the first arm 304 exceeds a specified insulation distance between phases and ground. Can be restricted to the range in which is positioned. As an example, this can be realized by restricting the position of the elastic member 305 pulled out from the base portion of the first arm 304 so as not to be retracted to a position that does not satisfy the prescribed compliance range. As a specific structure for that purpose, for example, an interference member (not shown) that interferes with the pushing movement trajectory of the telescopic member 305 may be provided inside the first arm 304. However, since it becomes impossible to return the expansion / contraction member 305 to the position where the first arm 304 becomes the shortest (see FIGS. 1 and 2), it is necessary to devise one. As a device for that, for example, the interference member can be displaced so as to fall from the interference position to the non-interference position, and is biased toward the interference position by, for example, a spring (not shown), and an external force generated by an external operation. To be able to fall into the non-interference position. In a state in which the expansion / contraction member 305 is pushed into the first arm 304, the interference member falls to the non-interference position due to the presence of the expansion / contraction member 305. When the telescopic member 305 is pulled out to a position where the pair of both-side cable heads 351 are positioned beyond the prescribed interphase and ground insulation distance, the interference member is brought into non-contact with the telescopic member 305, and the interference member is attached to the spring. It gets up and gets up at the interference position. If an attempt is made to push in the elastic member 305 in this state, the telescopic member 305 cannot be pushed in due to interference with the interference member. Therefore, in order to return the expansion / contraction member 305 to the original pushing position, the interference member is caused to fall down by an external force generated by an external operation. In this way, the both-side relay member 303 can restrict the expansion / contraction position of the first arm 304 to a range where the pair of both-side cable heads 351 are positioned beyond the prescribed interphase and ground-to-ground insulation distance.

  It should be noted that the structure for restricting the expansion / contraction range of the first arm 304 described above is not necessarily an essential configuration, and this may not be provided in the implementation.

(3) Structure for fixing the rotational position of the first arm 304 The double-sided relay member 303 can fix the rotational position of the first arm 304. As an example, this can be realized by providing a friction member (not shown) that is displaced from the first arm 304 toward the base 201. More specifically, as an example, the friction member is pressed against the base 201 in advance by a spring (not shown) to restrict rotation, and the friction member is held at a position separated from the base 201 against the biasing force of the spring. A mechanism for switching to the state may be provided. As a result, the rotational position of the first arm 304 can be fixed steplessly.

  Note that the structure for fixing the rotational position of the first arm 304 described above is not necessarily an indispensable configuration, and this may not be provided in the implementation.

(4) Structure for restricting the rotation range of the first arm 304 The double-sided relay member 303 can restrict the rotation range of the first arm 304 within a prescribed compliance range. As an example, this can be realized by restricting the rotation range of the both-side relay member 303 to the range of P1 to P2 on the reference arc described above. As a specific structure for that purpose, for example, an interference member (not shown) that interferes with the rotation locus of the both-side relay member 303 may be provided on the base 201. However, since it becomes impossible to return the both-side relay member 303 to the storage position (see FIGS. 1 to 3A and 3B), it is necessary to devise a device for the interference member between the storage position and the use position. Become. As a device for that, for example, the interference member can be displaced so as to fall from the interference position to the non-interference position, and is biased toward the interference position by, for example, a spring (not shown), and an external force generated by an external operation. To be able to fall into the non-interference position. When the both-side relay member 303 moves from the storage position to the use position, the interference member is pushed to the non-interference position by being pushed by the moving both-side relay member 303, and the both-side relay member 303 is moved from the use position to the storage position. In the case of moving to, it is ensured that it does not fall into the non-interference position even if it is pushed by the both-side relay member 303. In addition, when the both-side relay member 303 is returned from the use position to the storage position, the interference member is brought down to the non-interference position by an external operation so that the both-side relay member 303 can be returned to the storage position. In this way, the both-side relay member 303 can regulate the rotation range of the first arm 304 within the prescribed compliance range.

  Note that the structure for restricting the rotation range of the first arm 304 described above is not necessarily an indispensable structure, and this may not be provided in the implementation.

In such a configuration, in order to use the moving transformer MB, the moving transformer MB is towed by the vehicle 101 and carried to the power generation substation as the destination. Then, the installation position is tentatively determined and positioned at that position. Thereafter, if the cable head 351 (central cable head, both-side cable head) is used, the following operation is performed.
(Work 1)
As shown in FIGS. 3A and 3B, the elastic member 305 is pulled out and the first arm 304 is extended.
(Work 2)
As shown in FIGS. 4A and 4B, the pair of both-side relay members 303 are rotated and opened.
(Work 3)
As shown in FIGS. 4A and 4B, the central cable head 351 is attached to the central relay member 307, and the both-side cable heads 351 are attached to the both-side relay member 303. At this time, if the operations 1 and 2 are also completed, the pair of both-side cable heads 351 are positioned within the above-mentioned prescribed compliance range, and all the cable heads 351 (central cable head, both-side cable head) The insulation distance between the phases and between the ground is automatically secured. However, as shown in FIG. 4 (b), when there is a fence F, all the cable heads 351 (central cable head, both-side cable heads) are defined as those to be secured between the fence F and the ground. The insulation distance l ₄ is not automatically set. Therefore, when installing the moving transformer MB for the first time, care should be taken to ensure a distance l ₄ between the fence F and the moving transformer MB.
(Work 4)
The moving transformer MB is disconnected from the vehicle 101 and installed at that position.
(Work 5)
The terminal part 204 of the three-phase bushing 203 provided in the transformer 202 is connected to the terminal part 352 of the corresponding cable head 351 via a lead wire (not shown). And the cable 354 which has come out from the lower part of the cable head 351 is connected to another apparatus or equipment, for example, a circuit breaker.

  The order of the operations 1 to 4 described above does not matter. The order can be set appropriately depending on the situation. However, if the work 3 is performed prior to the work 2, the cable 354 may be dragged on the ground with the movement of the pair of both-side relay members 303, and the cable 354 may be damaged. Considering this possibility, it is desirable to perform the operation 3 after the operation 2 and finely adjust the positions of the pair of both-side relay members 303 as necessary.

  As described above, according to the present embodiment, the cable head 351 can be supported by the relay members (the central relay member 307 and the both-side relay members 303) without providing a large object such as a gantry. Therefore, it is possible to reduce the installation space of the moving transformer MB including the cable head 351. This is very important for the transformer MB for moving, which must secure the insulation distance between the phase and the ground in the cable head 351, greatly increasing the degree of freedom of the installation place, and thus improving the efficiency of the entire work. The remarkable effect that it can be improved greatly is produced.

  Further, since the cable head 351 can be quickly installed at an appropriate position simply by rotating the pair of both-side relay members 303 within a predetermined range, the labor required for the installation can be drastically reduced.

  Hereinafter, the effects based on the specific configuration of the present embodiment will be listed.

  In the present embodiment, the rotation center of the pair of first arms 304 is made common, and the rotation center is arranged on a vertical line passing through the terminal portion 204 provided in the middle bushing 203. Therefore, the cable head 351 supported by the both-side relay member 303 on the circumference centering on the vertical line (= rotation center C) that defines the interphase insulation distance between the terminal portion 204 provided in the middle bushing 203. Therefore, it is possible to set the compliance range without waste.

  In the present embodiment, the first arm 304 can be expanded and contracted. Therefore, when the cable head 351 is used, the first arm 304 can be extended to secure the insulation distance between the phases and the ground, and when the both-side relay member 303 is to be accommodated, the first arm 304 is contracted small. Thus, the entire moving transformer MB can be made compact.

  In the present embodiment, the length of the first arm 304 is set so as not to protrude from the horizontal projection surface of the base 201 in the shortest state. For this reason, when the vehicle 101 is towed, the first arm 304 can be prevented from jumping out from the rear portion of the moving transformer MB connected to the vehicle 101. The vehicle verification of the vehicle 101 describes the total length including a towed object such as the moving transformer MB. When traveling on the road, it is a violation if the actual total length exceeds the total length described in the vehicle verification. Preventing the first arm 304 from jumping out from the rear of the moving transformer MB has the significance of preventing such violations and complying with laws and regulations.

  In the present embodiment, the expansion / contraction position of the first arm 304 can be fixed. For this reason, it is possible to prevent the elastic member 305 from unexpectedly popping out regardless of whether the both-side relay member 303 is in the storage position or the use position. In addition, after setting the position of the cable head 351 so as to ensure the specified inter-phase and ground-to-ground insulation distance, the expansion member 305 is pushed in the pushing direction due to an unexpected accident, and the set insulation distance cannot be secured. As a result, the occurrence of a short-circuit accident can be reliably prevented.

  In the present embodiment, the expansion / contraction range of the first arm 304 can be restricted to a range in which the pair of both-side cable heads 351 are positioned at positions that exceed the specified insulation distance between the phases and the ground. For this reason, the cable head 351 can be positioned within the prescribed compliance range without measuring the insulation distance between the phases and the ground. Therefore, the time required for the installation work of the cable head 351 can be shortened, and labor can be reduced.

  In the present embodiment, the rotational position of the first arm 304 can be fixed. For this reason, the first arm 304 can be prevented from rotating unexpectedly regardless of whether the both-side relay member 303 is in the storage position or the use position. In addition, after setting the position of the cable head 351 so that the specified insulation distance between the phases and the ground can be secured, the insulation distance set by the first arm 304 being pushed in the rotation direction due to an unexpected accident can be secured. As a result, it is possible to reliably prevent the occurrence of a ground fault or a short circuit accident.

  In the present embodiment, the rotation range of the first arm 304 can be regulated within the prescribed compliance range. For this reason, the cable head 351 can be positioned within the prescribed compliance range without measuring the insulation distance between the phases and the ground. Therefore, the time required for the installation work of the cable head 351 can be shortened, and labor can be reduced.

  In the present embodiment, the base 201 is introduced as being towable by the vehicle 101. However, the term “towable” as used herein means that the base 201 is inseparably integrated with the vehicle 101. It is not intended to be excluded. The concept of “towable” includes a structure in which the vehicle 101 and the moving transformer MB are integrated, such that the loading platform 102 of the vehicle 101 is the base 201 as it is. In addition, it goes without saying that various modifications and conversions are allowed in implementation.

101 Vehicle 201 Base 202 Transformer 203 Bushing 303 Both-side relay member 304 First arm 306 Second arm 307 Central relay member 351 Cable head (central cable head, both-side cable head)
C center of rotation

Claims (8)

A transformer installed on a base that can be pulled by a vehicle;
Three bushings that are arranged in a width direction orthogonal to the length direction that is the front-rear direction of pulling of the base in a form that extends obliquely upward, and each connected to a three-phase conductor drawn from the transformer;
A central relay member attached to the base so as to face the middle bushing and extending upward to the base, and capable of supporting a central cable head connected to the middle bushing at an upper portion;
A pair of first arms attached to the base so as to be rotatable about a vertical axis, and displaced to a storage position extending in the length direction of the base and a use position extending in the width direction of the base by rotating together. A pair of second arms provided in a form extending upward from these first arms and capable of supporting a pair of both-side cable heads respectively connected to the bushings on both sides, respectively, A double-sided relay member for setting a prescribed compliance range for positioning the pair of both-side cable heads at positions exceeding the insulation distance between the prescribed phases and between the grounds in the rotation region of the pair of first arms;
A transformer for movement characterized by comprising:   The moving transformer according to claim 1, wherein the pair of first arms have a common rotation center, and the rotation center is arranged on a vertical line passing through a terminal portion provided in the middle bushing.   The moving transformer according to claim 1, wherein the first arm can be expanded and contracted.   4. The moving transformer according to claim 3, wherein the length of the first arm is set to a length that does not protrude from the horizontal projection surface of the base in the shortest state.   The moving transformer according to claim 3 or 4, wherein the position of expansion and contraction of the first arm can be fixed.   5. The expansion / contraction range of the first arm can be restricted to a range in which the pair of both-side cable heads are positioned at a position exceeding a specified insulation distance between phases and ground. The transformer for movement described in 1.   The moving transformer according to claim 1, wherein the rotational position of the first arm can be fixed.   The moving transformer according to claim 1, wherein a rotation range of the first arm can be regulated within the compliance range.

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