JP2006271013A - Bypass cable connecting device for ground installation type transformer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To connect a bypass cable simply to the bypass cable joint of an electric apparatus. <P>SOLUTION: In a ground installation type transformer device 11, where the inside of a casing 13 is partitioned into two rooms and in whose one compartment 13a a transformer 15 is accommodated, a secondary charger consisting of the U, V and W phases of the transformer is provided from the front to one side face of the transformer, and connecting conductors 23 are connected individually to each phase of the secondary charger, and also each phase connecting conductor and a low-voltage diverging device 16 for connecting with a distribution line that the transformer has are connected to each other by a connection bar 24, and each phase of connecting conductors connected to the low-voltage diverging device are collected separately for each phase on the side of one side face of the transformer, thereby being provided with the bypass cable joint 20, and connector connecting terminals 26 for connecting connectors 22 attached to bypass cables 21 are set at such positions that they not match one another at each phase in bypass cable joints for each phase, and bypass cables are connected to the connector connecting terminals via the connecting connectors. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the case where the ground-mounted transformer device installed in the underground distribution line breaks down or is periodically replaced, the ground-mounted transformer device that has failed until the new ground-mounted transformer device is installed. By simply powering off the load-side distribution line of the transformer-type transformer device for a relatively short time, the bypass cable can be installed quickly and easily to energize the load-side distribution line from the construction transformer. The present invention relates to a bypass cable connecting device of an installation type transformer device.

  Conventionally, when the ground-mounted transformer device installed in the underground distribution line needs to be replaced due to its failure or the like, for example, as shown in FIG. 8, the underground distribution line (primary side) The high-voltage distribution line 1 was cut off without interrupting the high-voltage distribution line 1 and the ground-mounted transformer device 2 requiring replacement due to a failure or the like was disconnected from the high-voltage distribution line 1 (note that On the general consumer side that has been supplied with power from the load-side distribution line (secondary side) 4 of the ground-mounted transformer device 2 that needs to be replaced due to a failure, the ground-mounted transformer device 2 is From when the high-voltage distribution line 1 is disconnected until when the bypass is formed and energization is resumed, power is not supplied and a power failure occurs.

  When the bypass path is formed, for example, as shown in FIG. 8, in the failed ground-mounted transformer device 2, the high-voltage cutout switch 3 connected to the high-voltage distribution line 1 is opened and ground-mounted. In addition to disconnecting the failed transformer device 2a portion of the transformer device 2 from the high-voltage side distribution line 1, the ground-type transformer device 2 connected to the secondary side of the transformer device 2a and the load-side distribution line 4 The switching plate 5 connecting the low pressure branching device 2b is dissociated. Thereafter, the secondary side of the construction transformer 6 and the bypass cable connecting portion 7 provided on the low voltage branching device 2b side of the transformer device 2a are connected by the bypass cable 8, and then the construction transformer. After the primary side of 6 is connected to the high-voltage side distribution line 1 via the construction switch 9, the construction switch 9 is turned on so that the low-voltage branching device 2b of the ground-mounted transformer device 2 that has failed → Power was supplied from the construction transformer 6 to the customer side in the area where power had been supplied by the ground-mounted transformer device 2 that had failed so far, via the load distribution line 4.

  When the bypass cable 8 is connected to the bypass cable connecting portion 7 provided in the low voltage branch device 2b of the ground-mounted transformer device 2, the lead wire 7a attached to the bypass cable connecting portion 7 and the bypass cable 8 And were connected using a dedicated adapter.

  Various adapters have been proposed as the dedicated adapter. For example, in the adapter disclosed in Patent Document 1, a thread groove is formed on the inner wall of the end portion, and the end of the bypass cable is provided inside. A cylindrical main body portion having an elastic ring for receiving a conductor connection terminal attached to the portion, and a wing plate extending in a horizontal direction from the cylindrical main body portion and having a V-groove for receiving a lead wire on the same axis. And a holding plate formed with a V-groove for holding the lead wire in the center, and attached to the bypass cable connecting portion formed in a narrow space of the ground-mounted transformer device The lead wire is inserted into the V groove of the battledore part, and the lead wire is sandwiched between the V groove of the presser plate having the V groove for holding the lead wire from above the battledore part, and thereafter , Hanuko It is configured to connect the bypass cable and the lead wire attached to the bypass cable connecting portion of the ground-mounted transformer device by fastening the part and the holding plate with a fastening bolt (for example, Patent Document 1).

JP-A-6-349535

  However, in the adapter for connecting the lead wire attached to the bypass cable connecting portion of the ground-mounted transformer device and the bypass cable provided on the construction transformer side, when connecting the lead wire to the adapter, In each case, once remove the clamping bolts that fasten the wing plate and the holding plate on the adapter side, fit the lead wire into the V-groove formed in the wing plate and the holding plate, and then remove both members from the lead wire. Connect the lead wire to the adapter and insert the conductor connection terminal at the end of the bypass cable into the elastic ring of the adapter by tightening it from the direction of the press plate through the tightening bolt to the feather plate while holding it so that it does not come off.・ Because it was fixed, the connection work between the bypass cable and the lead wire must be done in a very unstable state and with time and effort. So, it was very inefficient.

  Also, once the presser plate and tightening bolt are connected to the lead wire, remove it from the blade plate part, engage the lead wire with the V-groove of the blade plate part and the presser plate, and then fix the presser plate again with the tightening bolt. Since each time the lead wire was connected, the work of removing the presser plate and tightening bolts from the wing plate and then reattaching them was time consuming. In addition, there is a problem that parts such as a tightening bolt and a holding plate are lost.

  Further, after connecting the lead wire to the bypass cable via the adapter, the adapter is directly wound or covered with an insulator to the adapter to which the bypass cable is connected and the bypass cable connected to the adapter. Therefore, it is necessary to take safety measures that do not expose the adapter and the connection part directly to the outside, so connect the bypass cable to the bypass cable connection part formed on the low-voltage branching device side of the ground-mounted transformer device. The work to do was very inefficient and time consuming and labor intensive. For this reason, the early development of the bypass cable connection apparatus which can connect the bypass cable connection part of a ground installation type transformer apparatus and a bypass cable easily was desired.

  In view of the above problems, the present invention provides a bypass cable connecting device for a ground-mounted transformer device that can connect a bypass cable to a bypass path of an electrical device quickly, easily, and safely and reliably. It is to provide.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the inside of the housing is divided into two chambers, and the transformer device is accommodated in one compartment, and the other compartment contains the above-mentioned In a ground-mounted transformer device that accommodates high-voltage equipment connected to a primary charging section of the transformer device, the front surface and one side surface of the transformer device are composed of U, V, and W phases of the transformer device. A low-voltage branch that provides a secondary charging unit, and individually connects the connection conductors to the U, V, and W phases of the secondary charging unit, and connects the phase connection conductors to a load cable provided in the transformer device. Connect the device with a connection bar, gather the phase connection conductors connected to the low-voltage branching device for each phase on one side of the transformer device, and provide a bypass cable connection portion. Connect the connection connector attached to the bypass cable to the connection section. A connector connection terminal portion for connecting detachably formed at a position that does not conform to each phase, characterized by being configured to connect via the connector to the bypass cable to the connector connection terminal portion.

  The invention according to claim 2 is the cable connection device of the ground-mounted transformer device according to claim 1, wherein the connection connector connected to the connector connection terminal portion of each phase connection conductor is the connection A fastening bolt for connecting and fixing the connector to the connector connection terminal portion is provided so as not to fall off by the fastening bolt dropout preventing means.

  According to a third aspect of the present invention, in the cable connection device for the ground-mounted transformer device according to the second aspect, the fastening bolt drop-off prevention means provided in the connection connector is in contact with each phase connector connection terminal portion of the connection connector. A hole having a diameter larger than the mounting hole of the tightening bolt is drilled in a portion to be fixed, and a flat washer loosely engaged with the concave hole, and a tightening bolt protruding from the mounting hole of the tightening bolt adjacent to the flat washer It is characterized by comprising the above-mentioned flat washer and a retaining ring fitted to the rod part which does not have the threaded part so as to be able to contact and separate.

  According to a fourth aspect of the present invention, there is provided a cable connection device for a ground-mounted transformer device according to the first aspect, wherein each of the phase connection conductors protrudes from the transformer device in the periphery having a connector connection terminal portion. The front end of the support insulator is detachably engaged with the engagement hole of the insulating plate in which the engagement hole engaging with the support insulator is formed at the front end of the support insulator supporting and holding each phase connection conductor. The insulating connector covers the connecting connector connected to the connector connecting terminal portion of each phase connecting conductor and the periphery thereof.

  In the first aspect of the present invention, the connection conductors on the low-voltage side of the ground-mounted transformer device (U, V, W) are concentrated on one side of the transformer device, and the connection conductors of these phases Since the connector connection terminal part is individually formed for each phase in the gathering part, and the connector connector for each phase formed individually is connected to the connection connector to which the bypass cable is connected for each phase. As in the past, the lead wire attached to the bypass cable connecting part provided on the low voltage side of the ground-mounted transformer device is fitted into the V-groove of the adapter connected to the bypass cable, and the lead wire from above is inserted. Unlike the case where a presser plate with a V-groove for fitting the upper half is covered and both members are held with both hands and tightened with a tightening bolt in an unstable state, the connection connector is connected to the required connector. Tighten the bolts to the terminals The connection work between the bypass cable and the lead wire is bypassed compared to the case where the adapter is used to connect and fix it in an unstable state while holding it in an unstable state. Despite the tight installation of the connection connector connected to the cable, the clamping bolt can be tightened with the other hand while pressing the connection connector against the connector connection terminal with one hand. The connection work is always convenient because it can be performed quickly, easily and reliably without any special effort in a stable state.

  In the invention described in claim 2, since the fastening bolt drop-off prevention means for preventing the fastening bolt from dropping off is formed in the connection connector, when the connection connector is connected to the connector connection terminal portion, it is tightened. Since the bolts are always held in one piece without dropping from the connection connector, the connection work to the connector connection terminal of the connection connector can be performed quickly and easily, and the tightening bolt itself is dropped into the connection connector. Due to the fact that it is held so that it cannot be removed by the prevention means, the tightening bolt is mounted integrally with the connector when the bypass cable is pulled out of the storage location when it is in use or transported to the location of use. Therefore, when using the bypass cable, the tightening bolt is lost and the bypass cable cannot be connected. Also has the advantage that the problem can be reliably eliminated.

  In the invention according to claim 3, a concave hole having a diameter larger than that of the fastening bolt mounting hole is provided at one end of the connection connector, and a flat washer is loosely fitted into the concave hole, and the flat washer is passed through the mounting hole. When the fastening bolt inserted through the connection connector is to be removed from the connection connector by inserting the retaining ring formed in the C or E type into the lot portion having no thread portion of the protruding fastening bolt, When connecting the connection connector to the connector connection terminal section, the tightening bolt drop-off prevention means is configured so that the retaining ring comes into contact with the flat washer to securely prevent the tightening bolt from being detached from the connection connector. Since the connection bolt can be immediately screwed by aligning with the screw hole of the connector connection terminal, the tightening operation of the tightening bolt can be performed in almost one operation, which is convenient. Moni, since there is no problem of fastening bolts upon connection work of the bypass cable is lost, adverse effects associated with the loss of tightening bolts can satisfactorily solved, it is possible to perform the connecting operation of the bypass cable easily.

  In the invention of claim 4, when the bypass cable is connected via the connection connector, or before connection, the connector connection terminal portion is always covered with an insulating plate, for example, with a transparent insulating plate. Therefore, it is possible to reliably prevent an electric shock accident during energization, and the insulating plate can be removably locked using a support insulator protruding from the connector connection terminal portion. Therefore, there is an advantage that the insulating plate can be attached / detached quickly, easily and safely.

  Embodiments of the present invention will be described below with reference to FIGS. 1 to 3, 11 is a ground-mounted transformer device provided with the bypass cable connecting device 12 of the present invention, and 13 is its housing. As shown in FIG. 1, the casing 13 is formed in a rectangular parallelepiped shape, and the inside is partitioned into two chambers by a partition wall 14 in the length direction.

  One compartment (right side in FIG. 1) 13a of the housing 13 has a storage area almost twice that of the other compartment (left side in FIG. 1) 13b, and the transformer device 15 is accommodated and installed. Yes. A low-voltage branch electrically connected to the charging unit on the secondary side of the transformer device 15 is provided on the front side (the compartment 13a side shown in FIGS. 1 and 2) of the transformer device 15 and on one side surface shown in FIG. A device 16 is also provided. A load-side distribution line 17 connected to the low-voltage branching device 16 is connected to a customer side from a pit (not shown) provided directly below the ground-mounted transformer device 11 through an underground distribution line.

  The other compartment 13b of the housing 13 accommodates and installs a high voltage device 18, and the high voltage device 18 is generally constituted by a disconnector 18a and a high voltage cutout 18b. The high voltage cutout 18b is connected to the high voltage side of the transformer device 15, and the high voltage cable 19 led out from the high voltage side distribution line 1 is connected to the disconnector 18a.

  Next, as shown in FIG. 8, due to a failure of the ground-mounted transformer device 11, the power supply through the construction transformer 6 from the healthy section of the high-voltage side distribution line 1, as shown in FIGS. Bypass cable 21 → the bypass cable connecting portion 20 provided in the failed ground-mounted transformer device 11 → the low voltage branching device 16 → the load-side distribution line 17 is used to energize the customer side on the load side. The configuration of the bypass cable connecting device 12 will be described.

  The bypass cable connecting device 12 is roughly divided into a bypass cable connecting portion 20 formed on the transformer device 15 side and a connection connector 22 attached on the bypass cable 21 side.

  First, the bypass cable connecting portion 20 (hereinafter simply referred to as the connecting portion 20) will be described. As shown in FIGS. 1 and 2, the connecting part 20 has plate-like conductors a, b, c on the secondary charging parts 15 a, 15 b, 15 c made of U, V, W phases of the transformer device 15. Are connected to each other at each end (see FIG. 2) of the connecting conductors 23a, 23b, and 23c arranged in three stages in the vertical direction of the transformer device 15 and arranged in the horizontal direction (lateral direction). It is formed for each (U, V, W). In FIG. 2, 15 d is a charging unit provided on the neutral point side of the transformer device 15.

  The connection conductors 23a, 23b, 23c connected to the secondary charging portions 15a, 15b, 15c via the conductors a, b, c are, as shown in FIGS. In the W phase, a W-phase secondary charging unit 15c formed on one side surface of the transformer device 15 (see FIG. 2) is provided horizontally on the front side of the transformer device 15. Is connected to the low voltage branching device 16 on the front side of the transformer device 15 below the connection conductor 23b in parallel with the connection conductor 23b. , 2 are connected via connection bars 24a, 24b, 24c, respectively.

  The connection conductors 23a, 23b, and 23c are connected to the one side surface of the transformer device 15 in order to form the connection portion 20 on one side surface of the transformer device 15 (see FIG. 2). As shown in FIGS. 1 and 2 on the front and side surfaces of the transformer device 15, the connecting conductors 23 a, which are arranged in parallel in the horizontal direction over three strips, are arranged on the front and side surfaces of the transformer device 15. 23b and 23c are connected to each other by connecting conductors e, f, and g (see FIG. 5) bent so that the planar shape of each phase is L-shaped. Are present at the end portions (termination portions) of the respective phase connection conductors 23a, 23b, and 23c that are concentrated on one side of the transformer device 15.

  As shown in FIG. 2, connector connection terminal portions 26a, 26b, and 26c protrude from the surfaces of the phase connection conductors 23a, 23b, and 23c at the connection portions 20 provided in the phase connection conductors 23a, 23b, and 23c. As shown in FIGS. 2 and 5, the phase connector connecting terminal portions 26a, 26b, and 26c are protruded from the phase connecting conductors 23a, 23b, and 23c so as not to match each other. It is formed in a state shifted from each other. In FIG. 2, the neutral point charging unit 15d is connected to the connection unit 20 including the connector connection terminal unit 26d through a plate-like conductor d.

  Next, the structure of the connection connector 22 attached to the bypass cable 21 will be described with reference to FIG. In FIG. 6, the connection connector 22 includes a terminal fitting 22 a that is attached by crimping to the end of the bypass cable 21, a terminal plate 22 c that is secured to the terminal fitting 22 a with attachment bolts 22 b, and an upper side of the terminal plate 22 c. A fastening bolt 22e for screwing the terminal plate 22c into each connector connecting terminal portion 26a, 26b, 26c, 26d of the connecting portion 20 through the drilled mounting hole 22d, and a connector connecting terminal portion of the terminal plate 22c A concave hole 22g for inserting a flat washer 22f having a diameter larger than that of the mounting hole 22d on the opposite surface to 26a, 26b, 26c, and 26d and concentrically formed, and after the threaded portion of the tightening bolt 22e It is comprised by C type | mold fastened to the back part or the retaining ring 22h formed in E type | mold.

  As shown in FIG. 6, the connection connector 22 is normally attached to the bypass cable 21 via the terminal fitting 22a, and the tightening bolt 22e is screwed with the connector connection terminal portions 26a, 26b, 26c, and 26d. Even if the connection is unlocked, it is configured to be locked to the retaining ring 22h so as not to be removed from the mounting hole 22d of the terminal plate 22c.

  4 and 5, reference numeral 27 denotes an insulating plate that covers the entire connection portion 20 of the bypass cable 21 from the outside when the bypass cable 21 is connected to the connection portion 20, and is formed of, for example, a transparent acrylic plate. As shown in FIGS. 3 to 5, the insulating plate 27 is attached to a mounting plate 28 attached to the side surface of the transformer device 15 at a predetermined interval, and is disposed on one side surface of the transformer device 15. The connecting conductors 23a, 23b, and 23c of each phase are hooked and held detachably on a rod 30 protruding from the tip of a support lever 29 that supports and holds the mounting plate 28 at a predetermined interval. Yes.

  That is, as shown in FIGS. 4 and 5, the connection conductors 23a, 23b, and 23c of each phase are supported and held on the mounting plate 28 by the support insulator 29, and the connection conductors 23a and 23c are supported on the insulating plate 27. The head of the locking bolt 31 screwed to the rod 30 of the supporting insulator 29 to be held (however, only the supporting insulator 29 attached to the right end of the connecting conductor 23c shown in FIG. 5 is directly attached to the connecting conductor 23c) An engagement hole 32 for loose fitting is perforated, and the insulation plate 27 is engaged with the engagement hole 32 through the engagement bolt 32 and the engagement hole 32 through the engagement hole 32. As shown in FIG. 4, the rod 30 is detachably hooked and held so as to cover the bypass cable connecting device 12 provided on the side surface of the transformer device 15 and its periphery from the outside.

  As a result, when the bypass cable 21 is connected to the bypass cable connection device 12, each phase connection conductor 23a, 23b, 23c, 23d including the connection portion of the bypass cable 21 is satisfactorily covered by the presence of the insulating plate 27, When electric power is supplied to the consumer side by the bypass cable 21, it is possible to satisfactorily avoid an electric shock accident that occurs when an operator, a small animal, or the like accidentally contacts the charging unit.

  In FIGS. 1 and 2, 33 is a first inspection door attached to the front side of the ground-mounted transformer device 11, 34 is a second inspection door attached to the side surface of the transformer device 15, and 35 is A neutral point cable is connected to a connection bar 24d connected to the neutral point charging unit 15d, and is connected to a connection conductor 35a disposed laterally below the low-pressure branching device 16.

  Next, the case where the bypass cable 21 is connected using the bypass cable connection device 12 provided in the transformer device 15 will be described. As shown in FIG. 7, for example, when the ground-mounted transformer device 11 cannot be used due to a failure, the failed ground-mounted transformer is used until it is replaced with a new ground-mounted transformer device. As shown in FIG. 8, a bypass cable 21 is temporarily connected to a bypass cable connecting portion 20 provided on the secondary side of the device 11 using a bypass cable 21, and a faulty ground-mounted transformer device 11 is connected. This is a case where electric power is supplied to the customer side from the healthy section of the high-voltage underground distribution line 1 via the construction transformer 6.

  First, the case where the failed ground-mounted transformer device 11 is disconnected from the high-voltage underground distribution line 1 will be described. In this case, first, in FIG. 7, the disconnector 18 a installed in the ground-mounted transformer device 11 is opened to disconnect the ground-mounted transformer device 11 from the high-voltage underground distribution line 1. Dissociating the switching plate 36 (corresponding to the conductors a, b, c of this example shown in FIGS. 1 and 2) connecting the secondary charging units 15a, 15b, 15c and the low voltage branching device 16, By disconnecting the connection between the transformer device 15 and the customer side, the failed ground-mounted transformer device 11 is separated from the high-voltage underground distribution line 1.

  As described above, when the failed ground-mounted transformer device 11 is separated from the high-voltage underground distribution line 1, as shown in FIG. 8, the bypass cable 21 connected to the secondary side of the construction transformer 6 is It connects with the bypass cable connection part 20 of the bypass cable connection apparatus 12 provided in the transformer apparatus 15 shown in FIG. In this case, the primary side of the construction transformer 6 shown in FIG. 8 is not energized because the construction switch 9 is opened.

  Next, the case where the bypass cable 21 for connecting the construction transformer 6 to the failed ground-mounted transformer device 11 is connected will be described. First, the second inspection door 34 of the failed ground-mounted transformer device 11 is opened, and each phase including the bypass cable connecting device 12 is provided on one side of the transformer device 15 as shown in FIGS. The insulating plate 27 that covers the charging portion composed of the connection conductors 23a, 23b, 23c, and 23d from the outside is removed. In this case, since the engaging hole 32 of the insulating plate 27 is hooked to the rod 30 at the tip of the support insulator 29, the insulating plate 27 is lifted slightly upward to release the hook of the engaging hole 32 with the rod 30. In this way, the insulating plate 27 is removed by returning it to the front (right direction in FIG. 4).

  When the insulating plate 27 is removed, the bypass cable 21 is connected to the connecting portions 20 formed at the end portions of the phase connecting conductors 23a, 23b, 23c, and 23d, respectively. The connection of the bypass cable 21 is performed by connecting the connection connector 22 attached to the end of the cable 21 via the terminal fitting 22a to the connector connection terminal portions 26a, 26b, 26c. 26d.

  When the connection connector 22 connected to the bypass cable 21 is connected to the connector connection terminal portions 26a, 26b, 26c, and 26d at the ends of the connection conductors 23a, 23b, 23c, and 23d of the transformer device 15, first, FIG. 6, the terminal plate 22c of the connection connector 22 shown in FIG. 6 is pressed against the connector connection terminal portion 26a of the connection portion 20 formed on the U-phase connection conductor 23a, and the tightening bolt 22e inserted through the terminal plate 22c. Is screwed into the screw holes h (see FIG. 6) of the connector connecting terminal portions 26a, 26b, 26c, and 26d, so that the bypass cable 21 is connected to the U-phase via the connector 22 as shown in FIG. Connect to connection conductor 23a. In this example, two bypass cables 21 are connected to each of the phase connection conductors 23a, 23b, 23c, and 23d using the connection connector 22 as described above.

  As described above, when the bypass cable 21 is connected to the phase connection conductors 23a, 23b, 23c, and 23d, the connector connection terminal portions 26a, 26b, 26c provided on the phase connection conductors 23a, 23b, 23c, and 23d, respectively. The connection connector 22 previously attached to the bypass cable 21 is brought into contact with 26d, and the tightening bolt 22e inserted through the connection connector 22 is screwed into the screw hole h formed in the connector connection terminal portions 26a, 26b, 26c, and 26d. Thus, the bypass cable 21 can be easily connected.

  In addition, as shown in FIG. 6, the fastening bolt 22e itself is inserted into the mounting hole 22d of the terminal plate 22c, but the retaining ring 22h fixed to the rear portion of the threaded portion is recessed to communicate with the mounting hole 22d. The terminal plate 22c is secured to the flat washer 22f fitted in the hole 22g so as not to be removed from the mounting hole 22d, so that the terminal plate 22c is connected to the connector connecting terminal portion of each phase connecting conductor 23a, 23b, 23c, 23d. 26a, 26b, 26c, and 26d are brought into contact with the connector connecting terminal portions 26a, 26a, 26b, 26c, 26d without immediately preparing the fastening bolts 22e and without being dropped on the terminal plate 22c. Since it can be screwed into the screw holes h of 26b, 26c, and 26d, the connection work (8 pieces) of the bypass cable 21 is quick and easy without requiring any special labor. It can be done.

  When the bypass cable 21 is connected to the connection portion 20 of the transformer device 15 for each phase (U, V, W, neutral point) as described above, the engagement hole of the insulating plate 27 is connected to the rod 30 of the support insulator 29. By hooking 32, the insulating plate 27 covers the periphery of the connecting portion 20 to which the bypass cable 21 is connected. Thereafter, the first and second inspection doors 33 and 34 are closed, and the connection work to the ground-mounted transformer device 11 in which the bypass cable 21 is broken is finished.

  When the connection work of the bypass cable 21 is completed, when the construction switch 9 shown in FIG. 8 is inserted, the construction transformer 6 → the bypass cable 21 shown in FIGS. Electric power is supplied to the customer side via the load-side distribution lines 17 of the respective phase connection conductors 23a, 23b, 23c, 23d of the transformer device 15 shown.

  Then, after replacing the power supply to the customer side as described above, when replacing the failed ground-mounted transformer device, the construction switch 9 is opened again, and then the bypass cable 21 is broken on the ground. Disconnected from each phase connection conductor 23a, 23b, 23c, 23d of the transformer device 11. Also in this case, the tightening bolt 22e of the connection connector 22 provided in the bypass cable 21 is screwed into the screw connection h of the connector connection terminal portions 26a, 26b, 26c, and 26d of the phase connection conductors 23a, 23b, 23c, and 23d. The retaining ring 22h fixed to the tightening bolt 22e is locked by the flat washer 22f fitted in the concave hole 22d of the terminal plate 22c, and the tightening bolt 22e is removed from the mounting hole 22d of the terminal plate 22c. Since the connection connector 22 can be handled without worrying about the loss of the tightening bolts 22e, the connection and disconnection of the bypass cable 21 is coupled with the simplification of the connection work of the bypass cable 21. The operation is convenient because it can be quickly and reliably performed in conjunction with the cancellation of the management of the tightening bolt 22e.

It is a front view which shows the inside of the ground installation type transformer apparatus provided with the bypass cable connection apparatus of this invention. It is a side view which shows the inside of the ground installation type transformer apparatus provided with the bypass cable connection apparatus of this invention. It is a side view which shows the inside of the ground installation type transformer apparatus which attached the bypass cable. It is a front view which expands and shows the principal part of a ground installation type transformer apparatus. It is a top view which expands and shows the principal part similarly. It is a longitudinal cross-sectional view which shows the connection condition of a connection connector. It is a schematic connection diagram of a ground-mounted transformer device. It is a schematic explanatory drawing which shows one Example which supplies electric power to a customer side using a failure | damaged ground installation type transformer apparatus.

Explanation of symbols

2,11 Ground-mounted transformer device 2a, 15 Transformer device 12 Bypass cable connection device 20 Bypass cable connection portion 8, 21 Bypass cable 22 Connection connector 22c Terminal plate 22e Tightening bolt 22h Retaining ring 23a-23d Connection conductor 26a- 26d Connector connection terminal portion 27 Insulating plate 29 Support insulator 30 Rod

Claims (4)

  The inside of the housing is divided into two rooms, the transformer device is accommodated in one of the compartments, and the ground-mounted transformer in which the other compartment accommodates the high-voltage equipment connected to the primary side charging part of the transformer device. In the apparatus, a secondary side charging unit composed of U, V, and W phases of the transformer device is provided on the front surface and one side surface of the transformer device, and the U, V, and W phases of the secondary side charging unit are respectively provided. Connecting each connection conductor individually, connecting each phase connection conductor and a low voltage branch device connected to the load side distribution line provided in the transformer device with a connection bar, and connecting each phase connection to the low voltage branch device By connecting the conductors to one side of the transformer device for each phase to provide bypass cable connections, and to connect the connectors attached to the bypass cables to the bypass cable connections for each phase. In a position that does not match each phase Forms, the bypass cable connecting apparatus of the ground-type transformer apparatus characterized by being configured to be connected via a connector to the bypass cable to the connector connection terminal portion.   The connection connector to which the bypass cable connected to the connector connection terminal portion of each phase connection conductor is connected is provided with a tightening bolt for connecting and fixing the connection connector to the connector connection terminal portion. The bypass cable connection device for a ground-mounted transformer device according to claim 1, wherein the device is configured as described above.   The tightening bolt drop-off prevention means provided in the connection connector is provided with a hole having a diameter larger than the mounting hole of the tightening bolt in a portion that contacts each phase connector connection terminal portion of the connection connector. And a retaining ring fitted to the flat washer so as to be able to come into contact with and separate from a rod portion that does not have a screw portion of a tightening bolt protruding from a mounting hole of the tightening bolt adjacent to the flat washer. The bypass cable connecting device for a ground-mounted transformer device according to claim 2, wherein   Each of the phase connection conductors is supported and supported by a support insulator protruding from the transformer device in the periphery having the connector connection terminal portion, and is engaged with the support insulator at the tip of the support insulator that supports the phase connection conductor. A connection connector connected to the connector connection terminal portion of each phase connection conductor by the insulation plate by engaging the tip of the support insulator with the engagement hole of the insulation plate having the engagement hole detachably, and its periphery A bypass cable connection device for a ground-mounted transformer device, characterized in that the device is configured to cover the ground.

Images