JP4709620B2 - Current transformer fixing device - Google Patents

Description

  The present invention relates to a current transformer fixing device used for attaching a through-type current transformer to a cable drawn into a power facility.

  In a power facility provided in a power system, a through-type current transformer may be attached to a cable in order to obtain information on a current flowing through the power cable. For example, in a ground-mounted switch installed in a power distribution system, a feedthrough current transformer is installed in each of the three-phase power supply power cables that are launched from the basement in order to provide information on the line current to the slave stations. It is attached.

  The present applicant has previously proposed a current transformer fixing device for fixing a current transformer to a cable as disclosed in Patent Document 1. FIG. 13 shows a state in which the current transformer 4 is fixed to the cable 1 of the electric power facility 2 that draws the cable 1 raised from the underground using the current transformer fixing device 3 that has been proposed. The current transformer fixing device 3 includes an openable / closable gripping tool 5 for gripping the cable 1, and a part of the current transformer 4 is fitted in a current transformer fitting groove 5 a provided in the gripping tool 5. The cable 1 is arranged in a state where the cable 1 is held by the holding tool 5. The current transformer 4 is fixed to the cable 1 while being held by the gripping tool 5.

Further, as shown in Patent Document 2, a pair of annular pressing plates respectively brought into contact with both end faces in the axial direction of the current transformer are tightened in a direction to draw them together by a fastener, and the current transformer is interposed between the pressing plates. There is also known a current transformer fixing device which is fixed in a state where a pin is sandwiched.
Japanese Patent Laid-Open No. 8-55745 JP 2001-196251

  The proposed current transformer fixing device (FIG. 13) shown in Patent Document 1 can be applied to cables 1 of various diameters, but the diameter is significantly larger than the diameter of the cable, and a gripping tool can be attached. There is a problem that it is impossible to cope with a case where it is necessary to attach a current transformer to the terminal processing unit 1a of a difficult cable.

  In the current transformer fixing device, the current transformer can be attached to the cable terminal processing unit if the gripping tool is enlarged so that the cable terminal processing unit can be gripped. However, since the current transformer fixing device is enlarged, there arises a problem that the current transformer cannot be installed when the space between the cable phases is narrow.

  In addition, the current transformer is fixed in a state of being sandwiched between a pair of pressing plates by fastening a pair of annular pressing plates brought into contact with both end faces in the axial direction of the current transformer with a fastener. In the case of using the current transformer fixing device shown in Document 2, there is a risk of damaging the current transformer by tightening the holding plate when fixing the current transformer. There was a problem of requiring skill.

  In addition, both the current transformer fixing device described in Patent Document 1 and the current transformer fixing device described in Patent Document 2 need to be provided with a fixing device for each phase cable. When each of the current transformers is attached, it is necessary to provide three fixing devices, which causes a problem that the structure of the cable lead-in portion becomes complicated.

  An object of the present invention is to provide a current transformer fixing device that can cope with a case where a current transformer is attached to a terminal processing section of a cable and can also cope with a case where a space between cable phases is narrow. There is to do.

  Another object of the present invention is to provide a current transformer fixing device that eliminates the possibility of damaging the current transformer when the current transformer is fixed.

  Still another object of the present invention is to provide a current transformer fixing device capable of simplifying the structure of the cable lead-in portion when each current transformer is attached to a three-phase cable. .

  The present invention relates to a current transformer fixing device that fixes a through-type current transformer arranged so as to surround a cable to a structure arranged in the vicinity of the cable.

In the present invention, at least the outer periphery of a part of the current transformer is formed of a pair of members oriented in the longitudinal direction in a direction perpendicular to the axial direction of the current transformer, and deviated from the central axis of the current transformer. It is arranged so as to be opposed to the axial direction of the current transformer with the side portion sandwiched therebetween, and provided near the both ends in the longitudinal direction so as to be opposed to the axial direction of the current transformer at a position away from the current transformer. A pair of fixed fixtures, and a cushioning member made of a material having a large friction coefficient and elasticity with respect to the fixture and the current transformer and interposed between each of the pair of fixtures and the current transformer And a fastener that couples the pair of fasteners by tightening the vicinity of both ends in the longitudinal direction of the pair of fixtures facing away from the current transformer, and a pair of the fixtures by using the fasteners From a pair of fasteners when tightening In order to keep the tightening force applied to the current transformer through the material within an allowable range, a spacer is provided between the pair of fixtures to regulate the distance between the pair of fixtures, and the pair of fixtures. At least one of the tools was fixed to a structure near the cable.

  The said fastener can be comprised by the volt | bolt and the nut screwed together by this volt | bolt. The bolt may be provided in a state of penetrating a pair of fixtures, or may be provided in the form of a stud bolt having one end fixed to one fixture. Thus, when using a bolt and a nut as a fastener, the spacer which regulates the space | interval between a pair of fixing tools can be comprised by the collar arrange | positioned in the state fitted to the bolt which comprises a fastener. it can.

  It is preferable that the pair of fixtures is constituted by a pair of rectangular plate-like members having plate surfaces facing in the axial direction of the current transformer.

  As described above, the current transformer is held and the pair of fixings are fastened by fastening the pair of fixing devices arranged with at least a portion near the outer periphery of the current transformer sandwiched by the fasteners. When at least one of the tools is fixed to a structure in the vicinity of the cable, the current transformer can be positioned and fixed at a predetermined position with a simple structure. In addition, the fixture does not need to be formed in an annular shape in accordance with the shape of the current transformer, and can be made of a simple member such as a rectangle, so that the processing can be simplified and the current transformer can be fixed. The device can be manufactured at low cost.

  Moreover, there is no need to prepare a member suitable for the shape of the current transformer, as in the case of using a holding member arranged in contact with the axial end face of the current transformer, and the diameter of the current transformer is slightly different. However, since the current transformer can be fixed using the same fixing tool, the current transformer fixing device is made common to the current transformers of various specifications to reduce the cost of the current transformer fixing device. Can also be planned.

  Further, as described above, a buffer member is interposed between each of the pair of fixing tools and the axial end surface of the current transformer, and the tightening force by the fastener is transferred from the fixing tool to the current transformer via the buffer member. When a spacer is placed between a pair of fixtures and the distance between the fixtures is restricted, the current transformer can be fixed without applying excessive force to the current transformer. Therefore, the current transformer can be prevented from being damaged.

  In the proposed current transformer fixing device that fixes the current transformer to the cable via the gripping tool that grips the cable, the current transformer is held by holding the current transformer in the gripping tool that grips the cable. Because it was fixed to the cable, the space between adjacent cables is narrow, and it is difficult to attach a gripping tool to the cable, or a current transformer is installed so as to surround the terminal processing part of the cable where the gripping tool cannot be attached. Although not applicable when arranged, the current transformer fixing device according to the present invention is provided with a fixing device that sandwiches a portion near the outer periphery of the current transformer, and this fixing device is a structure in the vicinity of the cable. Since the current transformer is fixed at a fixed position by fixing to the cable, it can be applied without problems even when the space between adjacent cables is narrow.

In a preferred embodiment of the present invention, when a three-phase through-type current transformer arranged so as to surround three-phase cables arranged side by side in a lateral direction is fixed to a structure arranged in the vicinity of the cable. In addition, the current transformer fixing device is constituted by the following elements (a) to (h).
(A) the state sandwiched between a part of the portion of the at least the outer peripheral side of the current transformer of the one-phase at a position deviated from the central axis of the current transformer 1-phase of the current transformer of a three-phase It is arranged so as to be opposed to the axial direction of the one-phase current transformer, and its both ends in the longitudinal direction are opposed to the axial direction of the one-phase current transformer at a position away from the one-phase current transformer. A pair of first fixtures provided.
(B) It is made of a material having a large coefficient of friction and elasticity with respect to the first fixture and the current transformer sandwiched between the first fixture, and each of the pair of first fixtures and one phase. A pair of first buffer members interposed between the current transformers.
(C) a first pair of coupling the pair of first fixtures by tightening at least the ends of the pair of first fixtures facing each other at a position away from the one-phase current transformer in a direction of pulling them together; Fasteners.
(D) When the pair of first fixtures is fastened by the first fastener, the fastening force applied from the pair of first fixtures to the one-phase current transformer through the first buffer member is kept within an allowable range. Therefore, the 1st spacer which is arrange | positioned between a pair of 1st fixing tools, and controls the space | interval between a pair of 1st fixing tools.
(E) The three-phase current transformers are provided so as to extend in the direction in which the other two-phase current transformers are arranged side by side. The current transformer is disposed so as to face the axial direction of both current transformers with at least a portion near the outer periphery sandwiched therebetween, and both ends in the longitudinal direction are separated from the two-phase current transformer. A pair of second fixtures provided so as to face each other in the axial direction of the two-phase current transformer at a position .
(F) The second fixing tool and the current transformer sandwiched between the second fixing tools are made of a material having a large coefficient of friction and elasticity, and each of the pair of second fixing tools and two-phase A pair of second buffer members interposed between the current transformers.
(G) A second coupling unit that couples the pair of second fixtures by tightening at least both ends in the longitudinal direction of the pair of second fixtures facing each other at positions away from the two-phase current transformer in a direction of pulling them together. Fasteners.
(H) When a pair of second fixtures are clamped by the second fastener, the clamping force applied from the pair of second fixtures to the two-phase current transformer via the second buffer member is kept within an allowable range. Therefore, the 2nd spacer which is arrange | positioned between a pair of 2nd fixing tools, and controls the space | interval between a pair of 2nd fixing tools.

  In this case, the one-phase current transformer and the two-phase current transformer are arranged with their positions shifted in the vertical direction, and at least one of the pair of first fixtures and at least one of the pair of second fixtures. Are fixed to the structure in the vicinity of the cable.

  The two-phase current transformer among the UVW three-phase current transformers to which the first fixture is attached may be two adjacent current transformers (U phase and V phase, or V phase and W phase), Two-phase current transformers (U phase and W phase) at both ends may be used.

  The pair of first fixtures can be constituted by a pair of rectangular plate members having plate surfaces facing in the axial direction of the one-phase current transformer, and the pair of second fixtures are two-phase It can comprise by a pair of rectangular board | plate material which has the board surface which opposes the axial direction of a current transformer.

  If comprised as mentioned above, since the three-phase current transformer can be fixed using two sets of fixtures, the simplification of the structure of the cable lead-in portion can be achieved.

  As described above, according to the present invention, the pair of fixtures arranged at a position deviating from the central axis of the current transformer with at least a portion near the outer periphery sandwiched therebetween. The current transformer is held by fastening with a fastener, and at least one of the pair of fixtures is fixed to a structure in the vicinity of the cable, so the current transformer is positioned at a predetermined position with a simple structure. And can be fixed.

  Further, according to the present invention, it is not necessary to form the fixing device in an annular shape in accordance with the shape of the current transformer, and it can be configured by a plate material having a simple shape such as a rectangle, so that the processing can be simplified. The current transformer fixing device can be manufactured at low cost.

  Furthermore, according to the present invention, there is no need to prepare a member suitable for the shape of the current transformer as in the case of using a holding member arranged in contact with the axial end face of the current transformer. The current transformer can be fixed using the same fixture even if the diameter of the current transformer is slightly different. Therefore, the current transformer fixing device is made common to the current transformers of various specifications. The cost of the fixing device can be reduced.

  According to the present invention, the buffer member is interposed between each of the pair of fixing tools and the axial end surface of the current transformer, and the tightening force by the fastener is transferred from the fixing tool to the current transformer through the buffer member. Since it is designed to transmit and a spacer is arranged between a pair of fixtures to regulate the distance between the fixtures, the current transformer can be used without applying excessive force to the current transformer. Can be fixed, and the current transformer can be prevented from being damaged when the current transformer is fixed.

  Further, according to the present invention, a fixing device is provided for holding a portion near the outer periphery of the current transformer, and the current transformer is fixed at a certain position by fixing the fixing device to a structure in the vicinity of the cable. Therefore, there is an advantage that the present invention can be applied without problems even when the space between adjacent cables is narrow or when the current transformer is attached to the terminal processing section of the cable.

  Furthermore, in the present invention, a set of first phase fixing devices, first fasteners, and first buffer members for a single phase current transformer attached to the single phase cable of the three phase cables. A fixing device is provided, and another set of fixing devices including a second fixing device, a second fastener, and a second buffer member for a two-phase current transformer attached to each of the other two-phase cables. When provided, the three-phase current transformers attached to the three-phase cables can be fixed by two sets of fixing devices, so that the structure of the cable lead-in portion can be simplified.

  Hereinafter, an embodiment of a current transformer fixing device according to the present invention will be described by taking as an example a case where a current transformer is attached to a three-phase cable drawn from the ground to a ground-mounted switch installed in a power distribution system.

  FIGS. 1 to 3 show the structure of the main part of a ground-mounted switch. In these drawings, reference numeral 10 denotes a gantry and 11 is a metal container supported on the gantry 10. A phase switch is housed. The gantry 10 includes a base 10a configured in a rectangular shape by combining and welding shaped steel materials, and supports 10b, 10c, and the like whose lower ends are welded to the base 10a.

  Reference numerals 12u to 12w denote power cables on the three-phase power supply side that are set up from the cable outlet 13 of the underground ditch, and 12au to 12aw are terminal processing units for the cables 12u to 12w, respectively. Connectors 14u to 14w are provided at the upper ends of the terminal processing sections 12au to 12aw, and these connectors are attached to the bushings 15u to 15w attached to the bottom of the container 11 and connected to a switch in the container. .

The three-phase cables 12u to 12w are arranged side by side at a predetermined interval, and through-type current transformers 16u to 16w are respectively provided for these cables.
The current transformers 16u to 16w are formed by, for example, winding a secondary coil around an annular iron core in a toroidal shape, and molding the iron core and the secondary coil with an insulating resin. It is comprised so that (ring shape) may be exhibited.

Protrusions 16au to 16aw projecting radially outward from the outer peripheral surface of the resin mold part are provided on a part of the outer peripheral part of the resin mold part of the current transformers 16u to 16w. A frustoconical signal cable lead-out portion 18u to 18w is projected from the tip.
Signal cables 17u to 17w having one end of a core wire connected to both ends of the secondary coil of the current transformers 16u to 16w are externally provided through the projecting portions 16au to 16aw and the truncated conical signal cable lead-out portions 18u to 18w. And the signal cable lead-out portions 18u to 18w are integrated with the protruding portions 16au to 16aw and the insulation coating of the signal cables 17u to 17w, so that the signal cables 17u to 17w and the current transformers 16u to 16w are respectively provided. Waterproofing of the connection part of is planned. The other ends of the cores of the signal cables 17u to 17w are connected to a mating connector provided in the slave station via a connector (not shown), and the information on the line current detected by the current transformers 16u to 16w is the signal cable. It is transmitted to the slave station through 17u to 17w.

  The three-phase current transformers 16u to 16w are arranged so as to surround the cables 12u to 12w, respectively, and are fixed to a structure in the vicinity of the cable by the current transformer fixing device 20. In the present embodiment, the current transformers 16u to 16w are arranged so as to surround the terminal processing units 12au to 12aw of the cables 12u to 12w, respectively. In the present embodiment, the current transformer fixing device 20 also includes a first fixing device 21 that fixes a central one-phase (V-phase) current transformer among the three-phase current transformers 16u to 16w, By a second fixing device 31 that is arranged to be shifted in the vertical direction with respect to the first fixing device 21 and fixes the two-phase (U-phase and W-phase) current transformers 16u and 16w at both ends. It is configured. The configuration of these fixing devices will be described below.

  4 and 5 show a state in which the V-phase current transformer 16v is fixed by the first fixing device 21. FIG. The first fixing device 21 includes a V-phase current transformer in a state where at least a portion near the outer periphery of a part of the current transformer 16v is sandwiched at a position deviated from the central axis of the V-phase current transformer 16v. A pair of first fixtures 23 and 23 'arranged so as to face each other in the axial direction of 16v, and a first interposed between each of the pair of first fixtures 23 and 23' and the current transformer 16v. The pair of first fixings are tightened in the direction in which the two ends of the first fixing members 23, 23 ′ facing each other at a position disengaged from the buffer members 24, 24 ′ and the current transformer 16 v are pulled together. A pair of first fasteners 25, 25 for coupling the fasteners, and when the pair of first fasteners 23, 23 'is tightened by the first fasteners 25, 25, the first fasteners 23, 23' The tightening applied to the V-phase current transformer 16v through one buffer member 24, 24 '. First spacers 26, 26 that are disposed between the pair of first fixtures 23, 23 'to regulate the spacing between the pair of first fixtures 23, 23' in order to keep the shearing force within an allowable range; It is comprised by.

  The first fixtures 23 and 23 'are made of plate-like members made of a material having sufficient strength such as a steel plate. In the illustrated example, as shown in FIGS. 6 (A) and 6 (B) and FIGS. 7 (A) and 7 (B), the first fixtures 23 and 23 'are formed in a rectangular plate shape, The width dimension of one 23 (refer FIG. 7A, B) of the 1st fixing bracket 23 and 23 'is set larger than the width dimension of the other 23'. Holes 23a and 23a for passing fasteners for fastening the first fixtures 23 and 23 'are formed at both longitudinal ends of one first fixture 23, and both ends of the other first fixture 23' are formed. Are formed with holes 23 a ′ and 23 a ′ aligned with the holes 23 a and 23 a of the first fixture 23. At both ends in the longitudinal direction of one first fixing tool 23, holes 23b and 23b for passing bolts for fixing the fixing tool 23 to the gantry 10 are formed.

  The first buffer members 24 and 24 'are made of a material having a large coefficient of friction with respect to the first fixtures 23 and 23' and the current transformer 16v such as rubber or sponge and having elasticity. As shown in FIGS. 6 and 7, the first buffer members 24 and 24 ′ are attached to the opposing surfaces of the first fixtures 23 and 23 ′. The first buffer members 24, 24 ′ are provided so as to cover the opposing surfaces of the first fixtures 23, 23 ′ while avoiding portions where bolts and spacers to be described later are disposed.

  The first fasteners 25 and 25 for fastening the longitudinal ends of the first fixtures 23 and 23 'are the holes 23a and 23a at both ends of the first fixture 23 and the other first fixture 23'. Bolts 25a and 25a arranged in a state of passing through the holes 23a 'and 23a' at both ends, and lock nuts 25b and 25b which are screwed into these bolts 25a and 25a and fix both bolts to the first fixture 23; The nuts 25c, 25c screwed into the tips of the bolts 25a, 25a protruding above the first fixture 23 'through the holes 23a', 23a 'of the first fixture 23', the nuts 25c, 25c and the first It consists of spring washers 25d and 25d inserted between the fixtures 23 '.

  The illustrated first spacers 26 and 26 are made of a collar arranged in a state of being fitted to bolts 25a and 25a constituting the fasteners 25 and 25, and a pair of first fixing tools 23 and 23 '. When the fasteners 23 and 23 'are tightened by the fasteners 25 and 25, the interval between the two fixtures is regulated so as not to become a predetermined value or less.

  The first fixtures 23 and 23 'are provided in a state where at least one of them is fixed to a structure near the cable. In this embodiment, in order to fix one first fixing tool 23 to the gantry 10, a current transformer mounting plate 29 (see FIG. 1) is welded to the columns 10 b and 10 c of the gantry 10. , Screw holes that are aligned with holes 23b and 23b provided in the first fixture 23 are provided.

  When the current transformer 16v is fixed by the first fixing device 21, the bolts 25a and 25a are first inserted into the holes 23a and 23a of the first fixing member 23 as shown in FIG. Then, the bolts 25a and 25a are fixed to the fixture 23 by the lock nuts 25b and 25b, and the collars constituting the spacers 26 and 26 are fitted to the bolts 25a and 25a. Next, the first fixture 23 is fixed to the structure by screwing bolts 28 (see FIG. 2) inserted into the holes 23b, 23b of the first fixture 23 into screw holes provided in the current transformer mounting plate 29. To do.

  After fixing one first fixing tool 23 to the structure near the cable as described above, the cable 12v or a portion near the outer periphery of a part of the current transformer 16v through which the terminal processing portion 12av of the cable passes ( Preferably, the lower surface of the terminal portion 16av and the vicinity thereof is brought into contact with the portion of the first fixture 23 where the buffer member 24 is affixed, and the holes 23a 'and 23a of the other first fixture 23' are inserted into the holes 23a 'and 23a. The ends of the bolts 25a and 25a protruding from the upper ends of the spacers 26 and 26 are fitted, and the portion where the buffer member 24 'of the first fixing member 23' is attached is located near the outer periphery of the current transformer 16v. Make contact. Next, the spring washers 25d and 25d are fitted to the tips of the bolts 25a and 25a protruding upward from the first fixture 23 ', and then the nuts 25c and 25c are screwed onto the tips of the bolts 25a and 25a. Is tightened in the direction in which the first fixtures 23 and 23 'are attracted to each other, and the current transformer 16v is fixed to the structure near the cable with the current transformer 16v sandwiched between the fixtures.

  9 and 10 show a state in which the U-phase and W-phase current transformers 16u and 16w are fixed by the second fixing device 31. FIG. The second fixing device 31 is provided so as to extend in the direction in which the other two-phase current transformers 16u and 16w of the three-phase current transformers are juxtaposed, and the two-phase current transformers 16u and 16w. A pair of second fixings disposed so as to be opposed to each other in the axial direction of both current transformers with at least a portion near the outer periphery sandwiched therebetween at a position deviated from the central axis of each of the current transformers A pair of second cushioning members 34, which are made of rubber 33, 33 ', and a pair of second fixtures 33, 33' and a two-phase current transformer, 34 'and a pair of second fixtures that are opposed to each other at positions away from the two-phase current transformer are fastened in the direction in which at least both ends in the longitudinal direction are pulled toward each other. The two fasteners 35 and the second fasteners fasten the pair of second fasteners 33 and 33 '. In order to keep the tightening force applied to the two-phase current transformer from the pair of second fixtures via the second buffer members 34, 34 'when the pair of second fixtures 33, 33', the pair of second fixtures 33, 33 ' And a second spacer 36 that restricts the distance between the pair of second fixtures 33 and 33 '.

  The second fixtures 33 and 33 'are also made of a rectangular plate member made of a material having sufficient strength such as a steel plate. The configuration of the second fixtures 33 and 33 'is that the plate members constituting both fixtures have a length necessary to sandwich the two current transformers 16u and 16w, and constitute both fixtures. The point that the width dimension of the plate material is set to be equal, and the holes for passing the bolts constituting the fastener 35 are provided at the three ends of the longitudinal direction and the middle part of the plate material constituting both the fixtures Except that the hole corresponding to the hole 23b provided in the first fixture 23 is not provided, the configuration is the same as that of the first fixture 23, 23 '. In the state where the bolts and the spacers constituting the fasteners 35 of the plate material constituting both the fixtures 33 and 33 'are avoided on the opposing surface of the second fixtures 33 and 33', the second buffer is provided. Members 34, 34 'are affixed.

  As shown in FIG. 9, the second fastener 35 is provided so as to fasten three portions, that is, both ends in the longitudinal direction and the intermediate portion of the second fixtures 33 and 33 ′. Each of the second fasteners 35 includes a bolt 35a disposed in a state of passing through the hole of one second fixing tool 33 and the hole of the other second fixing tool 33 ', and the bolts 35a so as to screw both bolts. A lock nut 35b that is fixed to the second fixture 33, a nut 35c that is screwed onto the tip of a bolt 35a that protrudes upward from the second fixture 33 'through the hole of the second fixture 33', a nut 35c, It is comprised similarly to the 1st fastener 25 by the spring washer 35d inserted between 2 fixing tools 33 '.

  The second spacer 36 is configured by a collar arranged in a state of being fitted to the bolts 35a constituting each fastener 35. Each spacer 36 is interposed between a pair of second fixtures 33 and 33 ′, and when the fasteners 33 and 33 ′ are tightened so as to draw each other by the fastener 35, the distance between the fixtures is increased. Regulate so that it does not fall below a certain value.

  In order to fix the second fixture 33 to the gantry 10, current transformer mounting plates 39 and 39 are mounted on the columns 10b and 10c of the gantry 10 at positions corresponding to both ends of the second fixture 33 (see FIG. 1). These current transformer mounting plates are provided with through holes that match holes provided at both ends of the second fixture 33.

  When the current transformers 16u and 16w are fixed by the second fixing device 31, first, the second fixing tool 33 is placed on the current transformer mounting plates 39 and 39 welded to the gantry 10, By inserting bolts 35a into the through holes provided in the current transformer mounting plates 39, 39 and the holes provided at both ends of the second fixture 33, and tightening the lock nuts 35b screwed into the respective bolts 35 The bolts 35 are fixed to the second fixture 33 and the second fixture 33 is fastened to the current transformer mounting plates 39 and 39. Moreover, the bolt 35a which comprises the fastener 35 is inserted in the hole provided in the intermediate part of the 2nd fixing tool 33, and this bolt is fixed to the 2nd fixing tool 33 with the lock nut 35b. Thereafter, a collar constituting the spacer 36 is fitted into each of the three bolts 35 a protruding upward from the second fixing tool 33.

  After fixing one second fixing tool 33 to the structure in the vicinity of the cable as described above, a part (preferably a terminal) near the outer periphery of a part of the current transformer 16u through which the terminal processing unit 12au of the cable 12u passes. The lower surface of the portion 16au and the vicinity thereof) and the lower surface of the portion of the current transformer 16w through which the terminal processing portion 12aw of the cable 12w penetrates (preferably the terminal portion 16aw and the vicinity thereof). The tip of the bolt 35a protruding from the upper end of each spacer 36 is fitted into the corresponding hole of the other second fixture 33 '. Thus, the portion of the second fixing member 33 ′ to which the buffer member 34 ′ is attached is brought into contact with the outer peripheral portions of the current transformers 16u and 16w. Next, after a spring washer 35d is fitted to the tip of each bolt 35a protruding upward from the second fixture 33 ', a nut 35c is screwed to the tip of each bolt 35a and this nut is tightened, whereby the second Fasteners 33 and 33 'are tightened in a direction to draw them together. As a result, the current transformers 16u and 16w are sandwiched between the second fixtures 33 and 33 ', and both current transformers are fixed to the structure near the cable.

  Instead of fixing the current transformer to the cable as in the above embodiment, at least one of the pair of fixing tools is attached to a structure in the vicinity of the cable with the current transformer sandwiched between the pair of fixing tools. When fixed to the cable, the current transformer can be easily fixed at a fixed position even when the distance between the cable phases is short.

  Further, as described above, a buffer member is interposed between the fixture and the current transformer, and a spacer is disposed between the pair of fixtures so that the pair of fixtures is separated by the spacer. If the distance between them is not narrowed below a certain value, it is possible to prevent excessive force from being applied to the current transformer when fixing the current transformer. The risk of damaging the current transformer can be eliminated.

  As described above, the first fixing device 21 including the first fixing member, the first fastener, and the first buffer member with respect to the current transformer attached to the one-phase cable of the three-phase cables. When the second fixing device 31 provided with the second fixing tool, the second fastener, and the second buffer member is provided for the two-phase current transformer attached to each of the other two-phase cables. Since the three-phase current transformers attached to the three-phase cables can be fixed by two sets of fixing devices, the structure of the cable lead-in portion can be simplified.

  In the above embodiment, the V-phase current transformer 16v is fixed by the first fixing device 21 and the U-phase and W-phase current transformers 16u and 16w are fixed by the second fixing device 31. The combination of current transformers fixed together by one fixing device is not limited to the U phase and the W phase. For example, the second fixing device 31 is configured to fix the U-phase and V-phase current transformers 16u and 16v together, and the other one-phase current transformer 16w is fixed first. The second fixing device 31 may be configured so as to fix the V-phase and W-phase current transformers 16v and 16w together, and the other one-phase current transformer 16u. You may comprise the 1st fixing device 21 so that may be fixed independently.

  In the above embodiment, one of the three-phase current transformers is fixed by the first fixing device 21, and the other two-phase current transformers are fixed by the second fixing device 31. However, the current transformer fixing device is provided so as to individually fix the current transformer of each phase by providing a fixing device similar to the first fixing device 21 for each current transformer of each phase. It may be configured. In this case, if the fixing devices for fixing the three-phase current transformers are arranged with their positions shifted from each other in the vertical direction, the current transformer can be easily fixed even when the dimensions between the cable phases are short. be able to.

  If there is sufficient space between the phases of the three-phase cable, the three-phase current transformers are arranged in a horizontal row, and these three-phase current transformers are collectively arranged by a set of fixing devices. It can also be fixed to a structure near the cable.

  In the above embodiment, in the first fixing device and the second fixing device, only one of the pair of fixing tools is fixed to the structure in the vicinity of the cable (the gantry in the above example). You may make it fix both a pair of fixing tools to the structure of the vicinity of a cable.

  In the above embodiment, one of the pair of fixtures is bolted to the current transformer mounting plate welded to the gantry. However, in the present invention, at least one of the pair of fixtures sandwiching the current transformer is used. May be fixed to a structure in the vicinity of the cable, and the fixing method of the fixing tool is arbitrary.

  In the above embodiment, both ends in the longitudinal direction of the pair of fixtures 33, 33 ′ of the second fixing device and the intermediate portion in the longitudinal direction are fastened by the fasteners. Only both ends in the longitudinal direction of 33 'may be fastened by a fastener.

  In the above embodiment, a normal bolt and a nut are used as a fastener for tightening the pair of fixing tools in a direction to draw them together. However, the stud bolt fixed to one of the pair of fixing devices by welding or the like is attached to the stud bolt. Each fastener can also be constituted by a nut to be screwed together.

  In the above embodiment, the pair of fixtures is made of a metal plate such as a steel plate. However, the fixture may be made of a material having sufficient strength, and the material constituting the fixture is not necessarily limited to metal. Absent. For example, the fixture can be made of fiber reinforced resin (FRP).

  In the above-described embodiment, each of the pair of fixtures is formed in a rectangular plate shape, but the pair of fixtures can sandwich at least a portion near the outer periphery of a part of the current transformer between them. It suffices that each fixing tool is not necessarily formed in a rectangular plate shape.

  In the above description, the shock absorbing member is made of rubber or sponge. However, the shock absorbing member has a large coefficient of friction with respect to the fixture and the current transformer that the shock absorbing member contacts, and has sufficient elasticity. What is necessary is not limited to rubber or sponge. For example, the buffer member can be made of a foamable resin material.

It is the front view which showed the structure of the principal part of embodiment of this invention. It is a left view of the principal part of FIG. It is a perspective view of the principal part of the embodiment. It is the side view which showed the structure of the 1st fixing device used in the embodiment. FIG. 5 is a top view of FIG. 4. (A) And (B) is the front view and bottom view which showed the upper fixing tool which comprises the 1st fixing device used by the embodiment, respectively with the buffer member. (A) And (B) is the top view and front view which showed the lower fixing tool which comprises the 1st fixing device used by the embodiment, respectively with the buffer member. It is a disassembled front view of the 1st fixing device used in the embodiment. It is the side view which showed the structure of the 2nd fixing device used in the embodiment. FIG. 10 is a top view of FIG. 9. It is the side view which showed the state which fixed the current transformer to the mount of a ground installation type switch by the current transformer fixing device concerning this embodiment. FIG. 12 is a top view of FIG. 11. It is the side view which showed the conventional current transformer fixing device.

DESCRIPTION OF SYMBOLS 10 Ground installation type switchgear 12u-12w Cable 16u-16w Current transformer 21 1st fixing device 23,23 '1st fixing tool 24,24' 1st buffer member 25 1st fastener 26 1st spa 29 Current transformer mounting plate 31 Second fixing device 33, 33 'Second fixing tool 34, 34' Second buffer member 35 Second fastener 36 Second spacer 39 Current transformer mounting plate

Claims (6)

In a current transformer fixing device for fixing a through-type current transformer arranged so as to surround a cable to a structure arranged in the vicinity of the cable,
Wherein the current transformer in a direction perpendicular to the axial direction has become a pair of members with its longitudinally of a portion of the current transformer at a position deviated from the central axis of the current transformer at least near the outer periphery It is arranged so as to be opposed to the axial direction of the current transformer with the portion sandwiched therebetween, and so that the vicinity of both ends in the longitudinal direction is opposed to the axial direction of the current transformer at a position away from the current transformer. A pair of fixtures provided ;
A buffer member made of an elastic material having a large friction coefficient with respect to the fixture and the current transformer, and interposed between each of the pair of fixtures and the current transformer; A fastener that couples the pair of fixtures by tightening the ends of the pair of fixtures opposite to each other at positions away from the container in a direction that pulls them together;
In order to keep the tightening force applied to the current transformer from the pair of fasteners via the buffer member when the pair of fasteners is tightened by the fastener, the gap between the pair of fasteners is maintained. A spacer that is disposed in the space and regulates a distance between the pair of fixtures;
Comprising
At least one of the pair of fixtures is fixed to the structure;
A current transformer fixing device. The fastener includes a bolt and a nut screwed to the bolt,
The current transformer fixing device according to claim 1, wherein the spacer comprises a collar fitted to a bolt constituting the fastener.   3. The current transformer fixing device according to claim 1, wherein the pair of fixing tools is formed by a pair of rectangular plate-like members having plate surfaces facing in the axial direction of the current transformer. In a current transformer fixing device for fixing a three-phase through-type current transformer arranged so as to surround three-phase cables arranged in parallel in a lateral direction to a structure arranged in the vicinity of the cable, Among the three-phase current transformers, the one-phase current transformer is positioned at a position deviating from the central axis of the one-phase current transformer, with at least a portion near the outer periphery sandwiched therebetween. The current transformer is disposed so as to be opposed to the axial direction of the current transformer, and is provided so that both ends in the longitudinal direction are opposed to the axial direction of the one-phase current transformer at a position away from the one-phase current transformer. A pair of first fixtures,
The first fixture and the current transformer sandwiched between the first fixtures are made of a material having a large coefficient of friction and elasticity, and each of the pair of first fixtures and the one-phase A pair of first buffer members interposed between the current transformer and the current transformer;
A first fastener that couples the pair of first fasteners by tightening both ends in the longitudinal direction of the pair of first fixtures facing each other at a position away from the one-phase current transformer. When,
When the pair of first fasteners is tightened by the first fastener, the tightening force applied from the pair of first fasteners to the one-phase current transformer through the first buffer member is within an allowable range. A first spacer that is disposed between the pair of first fixtures to regulate a distance between the pair of first fixtures;
The provided so as to extend in the arrangement direction of the current transformer for other two phases of the current transformer of a three-phase, two current transformer at a position deviated from the respective center axis of the current transformer of the two-phase It is arranged so as to be opposed to the axial direction of both current transformers with at least a part near the outer periphery sandwiched between them, and the vicinity of both ends in the longitudinal direction is away from the two-phase current transformer. A pair of second fixtures provided to face the axial direction of the two-phase current transformer ;
The second fixing tool and the current transformer sandwiched between the second fixing tools are made of a material having a large coefficient of friction and elasticity, and each of the pair of second fixing tools and the two-phase A pair of second buffer members interposed between the current transformers;
A second fastening that couples the pair of second fixtures by tightening at least both ends in the longitudinal direction of the pair of second fixtures facing each other at a position away from the two-phase current transformer. Ingredients,
When the pair of second fixtures are clamped by the second fastener, the clamping force applied to the two-phase current transformer from the pair of second fixtures via the second buffer member is within an allowable range. A second spacer that is disposed between the pair of second fixtures to regulate a distance between the pair of second fixtures;
Comprising
The one-phase current transformer and the two-phase current transformer are arranged with their positions shifted in the vertical direction,
At least one of the pair of first fixtures and at least one of the pair of second fixtures are fixed to the structure;
A current transformer fixing device. The pair of first fixtures is composed of a pair of rectangular plate members having plate surfaces facing in the axial direction of the one-phase current transformer,
5. The current transformer fixing device according to claim 4, wherein the pair of second fixing tools includes a pair of rectangular plate members having plate surfaces facing in an axial direction of the two-phase current transformer. 6.   The current transformer fixing device according to claim 1, 2, 3, 4, or 5, wherein the current transformer is arranged so as to surround a terminal processing portion of the cable.

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