KR101801644B1 - Connection Apparatus of Light Weight Buffer Metal for High Tension Wire - Google Patents

Abstract

The present invention relates to a light weight buffer metal connection apparatus for a wire cable. According to the present invention, construction is easily performed, light weight buffer metal installation is performed easily and quickly, stability is improved due to excellent insulation property, a stable installation state of the light weight buffer metal can be continuously maintained, and the installation height of the light weight buffer metal can be vertically adjusted. The light weight buffer metal connection apparatus comprises: a semicircular ring; a telephone pole fixing frame; and a square light weight buffer metal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light-

More particularly, the present invention relates to a light guide connecting device for a cable, more particularly, to a light guide connecting device for a wire cable, which can simplify installation, facilitate quick installation of light fittings, The present invention relates to a light guide connecting device for a wire cable, which can maintain the state constantly and adjust the mounting height of the light guide wire in a vertical direction.

Generally, the large power generated in a power plant is transmitted to each substation with high-voltage power through a power transmission line such as a transmission tower, and then transformed power is supplied to substations by a cable to be used in each customer.

The electric power supply to the general customer is supplied through the telephone pole. In this case, the wire cable in each telephone pole is divided into a single-phase type, a 2-wire type and a 3-wire type according to the distribution line. It is already known.

Here, since high-voltage electricity is supplied as 3-phase 3-wire or 3-phase 4-wire, three or four cables are connected and they should be installed so that they can always be installed with a tight tension to prevent short-

Therefore, the high-voltage cable is installed at regular intervals and the supporting cable (hereinafter referred to as "light cable") is installed on the upper part of the pole so that each high-voltage cable has parallel and tight tension at an interval that is not short- The supporting cable support is formed in the shape of a square tube and fixed to the upper part of the electric pole with a band type clamp.

In the conventional connection method of the electric cable, the electric wire cables are connected and connected to each other through the suspending insulators at both sides of the light ends which are horizontally disposed on both sides of the top of the electric pole in the direction orthogonal to the line direction of the electric cable, And the jumper wire is supported upward or downward through a line insulator (pin insulator) fixed to the upper surfaces of both sides of the light guide wire.

In this case, it is possible to use a separate "U" -shaped connecting rod that can fix the connection to the electric pole by connecting several suspending insulators and supporting insulators to the electric pole to enable the electric cable to be installed. It has been taken as a simple construction method of fastening and setting.

Therefore, the installation of Kwangwang Gold could not be achieved easily and stably, and there were many inconveniences and difficulties in construction.

Specifically, in order to install the light armament, a method of placing the "U" -shaped connector in the electric pole and then moving the light arm to the "U" -shaped connector in such a state, There was a problem that it was practically impossible to construct the worker alone.

This is because the connection structure between Kwangwang gold and the U-shaped coupling claws was unstable and there was a structural deficiency that was insufficient to maintain the stable installation of the cuffs on the telegraph pole.

Especially, when the direction of the line is shifted to one side of the telephone pole and the lightwave is tilted to one side of the telephone pole, there is a problem that a separate ground should be installed to maintain a stable fixed state.

In addition, a switchboard connected to an electric cable connected to a telephone pole is installed inside or outside the facility such as a plant or a large building or a substation where a lot of electric power is used, and the operation of a generator or a transformer is controlled through a distributor, And the instruments and instruments necessary to turn off the apparatus are arranged and fixed.

Such switchboards are installed in building electrical equipment of a certain scale or more and are installed in a building electrical equipment of a certain size or more to block or interfere with excessive current caused by a short circuit or ground fault in the distribution system and various branch lines, To prevent a fire accident such as a fire accident.

In the conventional switchboard, a leakage current sensing device is installed so that the leakage state can be displayed step by step according to the set value, thereby allowing the manager to easily observe the leakage current per each circuit by the naked eye to efficiently perform the safety management of the electric facility .

However, the conventional leakage current detecting device installed in the switchboard is only connected to the power distribution line, and it can only detect the electric leakage of the electric equipment. It detects the leakage current to the ground wire of the first kind, second kind, I could not.

Even if the ground wire is checked, it is troublesome to connect a separate portable device such as an electric voltage tester every time of inspection, and it is impossible to measure the leakage current of the ground wire in real time.

It was impossible to check the grounding (insulation) state in real time through the switchboard, so that it was impossible to prevent the damage of the parts of the switchboard due to the leakage current and the safety accident in advance, There was a waste problem.

Korean Registered Patent Publication No. 10-1597096

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method of installing a lightning bolt, And the height of the light guide metal can be appropriately adjusted in the vertical direction.

In order to achieve the above-mentioned object, the present invention provides a light-to-earth connection apparatus for a wire cable, which is divided into two parts, that is, a front portion and a rear portion, A front and rear electret frame fixed to the front and rear electret legs, respectively, the front and rear electret legs being fixed to the front and rear electret legs; Wherein the front and rear electret legs are inserted into a band ring groove formed in the periphery of the semicircular ring portion and are made of an insulating material in close contact with the main body of the electromagnet, A left and a right insertion support portion projecting upwardly and having a square through hole on the inside, The rectangular lightening arm is a rectangular tube body which is elastically bent outwardly and backwardly outwardly by elasticity and inserted and fixed to the front and rear sides of the rectangular support holes of the front and rear teletext fuselage fixing brackets. The upper and lower fixing holes are vertically formed, And a stop bolt which is spaced from and is screwed to the fastening holes on the right and left sides to continuously maintain the state of the front and rear electric pole fixture while preventing the left and right side electric pole fixture from being squashed by elasticity, Wherein the cable connecting device is adjustably connected to the cable connecting device. Wherein a wire cable connected to a telephone pole provided with a light guide connecting device for the wire cable is extended and connected, and an underground distribution cable and a switchboard for distribution connection are provided apart from the telephone pole; Wherein the switchboard comprises a door, a case extended from the electric pole and connected to the inside and a ground distribution cable are connected to each other; The switchboard includes a leakage current sensing unit connected to a plurality of ground lines connected to the wire cable and the underground distribution cable to convert a measured current into a predetermined digital signal, a relay circuit unit for selectively inputting / outputting a current measured at each ground line, An input unit for setting an operation reference value to be compared with a digital signal of a current measured through the ground line; a control unit for determining a state of a ground line by comparing the digital signal measured at the ground line with the operation reference value; An alarm unit for generating an alarm signal for the state; And a display unit for displaying a state of a ground wire according to a judgment of the control unit and a leakage current value measured at a ground line; The leakage current sensing unit includes a main body case mounted on the ground and having a space therein, a first coupling recess formed at both ends of the main body case, and a ground plate connected to the ground line, A current sensing sensor installed in the main body case and electrically connected to the ground plate to sense the electroluminescence current and transmit a sensing signal, and a current sensing sensor electrically connected to the current sensing sensor, A ground block for transmitting a signal to be transmitted, and a replacement unit for maintaining a state in which the current sensing sensor is housed in the main body case when the current sensing sensor is detached from the main body case.

The seat case may have a seating groove formed at one end thereof for receiving an end portion of the current sensing sensor. The seating groove may be connected to the first seating groove and the second seating groove.

The exchange unit includes a pair of disk members having a plurality of grooves formed thereon so as to seat the plurality of current sensors, and a rotating shaft connecting the disk members and rotatably arranging the disk members. And a nut coupling unit may be provided to drive the pinion to be inserted.

As described above, according to the present invention, it is possible to simplify the construction, to install the light fittings more quickly, to improve the safety due to the excellent insulation property, to provide a stable installation of light fittings It is possible to maintain the state constantly and to adjust the installation height of the light guide plate in the vertical direction appropriately.

FIG. 1 is a perspective view showing a construction of a light guide connecting device for a cable according to an embodiment of the present invention,
FIG. 2 is an exploded perspective view showing a fastening joint of a light-to-bull connection device for a wire cable according to an embodiment of the present invention,
FIG. 3 is a plan view showing a construction of a light guide connecting device for a cable according to an embodiment of the present invention,
FIG. 4 is a plan view showing the operation of a light guide connecting device for a wire cable according to an embodiment of the present invention,
FIG. 5 is a perspective view showing an electrical distribution board for connection of distribution cables of an underground distribution cable by extending a wire cable connected to a telephone pole provided with a light guide connecting device for a wire cable according to the present invention,
6 is a block diagram showing a basic configuration that facilitates replacement of a leakage current sensing unit of a ground wire installed in an ASS according to an embodiment of the present invention,
FIG. 7 is a view illustrating a structure in which a leakage current sensing unit of a ground wire installed in an ASS according to an embodiment of the present invention is easily connected to a ground line,
8 is an exploded perspective view illustrating a leakage current detection unit installed in an ASSEMBLY according to an embodiment of the present invention,
FIG. 9 is a perspective view of a leakage current sensing unit of a ground wire installed in an ASS according to an embodiment of the present invention,
FIG. 10 is a cross-sectional view illustrating an exhaust means and a check valve installed in an A / D board according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to easily carry out the present invention.

As shown in FIGS. 1 to 4, the light-to-air connecting apparatus for a wire cable according to an embodiment of the present invention includes a front and rear electric pole fixing frames 10 and 10a fixedly installed on an upper end of a main pole 30, (20,20a) fixedly installed at the left and right ends of the rectangular parallelepiped (10,10a).

The front and rear electric pole fixation frames 10 and 10a are planes which are divided into front and rear sides with the electric pole 30 interposed therebetween and are installed standing upright but have a long elasticity and are inserted and fixed in the rectangular light pole pieces 20 and 20a, And a semicircular ring portion 11 surrounding the outer periphery of the semicircular ring portion 11 and a band ring groove 11a for inserting and fixing an anti-slip band 12 made of an insulating material are formed in the periphery of the semicircular ring portion 11, Anchor bolts 13 and bolt holes 13a are formed on the inner side surfaces of the right and left side of the main body 30 in the front and rear directions so as to be fastened and fixed by the fastening nuts 13b. And left and right insertion support portions 14 and 14a having protruded inner side rectangular through holes 15 and 15a, respectively.

The rectangular light inks 20 and 20a are inserted into the square through holes 15 and 15a of the left and right inserting and supporting portions 14 and 14a of the front and rear electret frame fixing brackets 10 and 10a which are resiliently bent outward and backward by elasticity, And a line post insulator 41 having a fixed power line 40 is fastened and fixed on the front and rear surfaces. A plurality of fastening holes 21 are formed on upper and lower sides of the left and right upper and lower sides, And a stop bolt 22 is formed which is screwed to the fastening hole 21 of the fastening hole 21 so as to prevent the right and left sides of the front and rear electric pole fixture frames 10,

In the present invention as described above, the front and rear fixed legs 10 and 10a are prevented from slipping by the anti-slip band 12, and the anchor bolts 13 and corresponding bolt holes 13a And the anchor bolt 13 protruded through the bolt 13 is tightly fastened and fixed to a desired position by the fastening nut 13b.

In this state, the left and right ends of the elastic members of the front and rear electret legs 10, 10a are curved to the front and rear sides of the main body 30, and then the square and the through holes 15, 15a of the right and left insertion support portions 14, The stop bolts 22 are fastened and fixed to the fastening holes 21 adjacent to the outside of the left and right insertable supports 14 and 14a with the light ends 20 and 20a inserted, 20a can be quickly fixed to the upper end of the main body 30 while maintaining a proper distance between the quadrangular braces 20, 20a.

As described above, the present invention can simplify the construction, make the installation of the light fittings easier and quicker, improve the safety due to the excellent insulation property, maintain the stable installation state of the light fittings, The height can be appropriately adjusted in the vertical direction.

5, the electric cable connected to the electric pole 30 provided with the light guide connecting device for the electric cable is extended and connected so that the electric distribution board for distribution connection with the underground distribution cable L is separated from the electric pole 30 And is provided on the ground.

The switchboard is composed of a case 100 and a cable fixing device 200. The cable fixing device 200 is constructed such that the cable cable connected to the electric pole 30 is inserted into the inside of the switchboard and is connected to the underground cable L It is used for securing the underground cable (L) temporarily and then making the power distribution connection securely.

The case 100 is provided with a door 110 and is installed on the ground where the underground cable L is drawn out. The underground cable L is connected to the inside of the case 100 for power distribution.

As shown in FIG. 6, the switchboard includes a leakage current sensing unit 510, a relay circuit unit 556, an input unit 550, a control unit 500, A display unit 554, a communication unit 540, and a power source unit 530. The display unit 554,

Inputs A, B, and C of the leakage current sensing unit 510 are connected to the ground line of the switchboard by terminals to which the leakage current sensing unit 510 is connected, as shown in FIG.

In this way, through the leakage current sensing unit 510, the amount of current leaking to a plurality of ground lines connected to the electric cable of the power distribution board and the ground distribution cable is measured in real time to prevent component damage and safety accidents due to the ground fault The amount of leakage current can be checked at any time to reduce power consumption.

The switchboard according to the present embodiment includes a leakage current sensing unit 510 that is connected to a plurality of ground lines connected to a wire cable and an underground distribution cable to convert a predetermined digital signal into a measured current, An input unit 550 for setting an operation reference value to be compared with a digital signal of a current measured through a ground line, and a comparator 555 for comparing the digital reference signal and the operation reference value, A notification unit 552 for generating an alarm signal for the state of the ground wire according to the judgment of the control unit 500 and a control unit 500 for controlling the state of the ground wire according to the judgment of the control unit 500, And a display unit 554 for displaying a current value.

As shown in FIGS. 8 and 9, the leakage current sensing unit 510 includes a main body case 712 provided on the ground and having a space therein, A ground plate 715 inserted in the coupling groove portion 714a and the second coupling groove 714b and connected to the ground line to provide a leakage current, and a ground plate 715 provided in the main body case 712 and electrically connected to the ground plate 715 A current sensing sensor 711 for sensing the electrowetting current and transmitting a sensing signal; and a current sensor 711 electrically connected to the current sensing sensor 711 when the current sensing sensor 711 is installed in the main body case 712, And a replacement unit 570 that maintains a state in which the current sensing sensor 711 is accommodated in the main body case 712 when the current sensing sensor 711 is separated from the main body case 712. [ .

When a ground plate 715 having a cable connected to a ground line is inserted into the first engagement groove portion 714a and the second engagement groove portion 714b formed at both ends of the body case 712, The current flowing along the cable connected to the ground wire is detected by the surface contact formed on the ground wire.

A grounding block 716 is provided on the inner wall of the central portion of the main body case 712 to contact the current sensing sensor 711. A sliding groove 717 is formed in a ring shape on the peripheral surface of the grounding block 716, The current sensing sensor 711 can be rotated while the sliding protrusion 720 formed at the center of the current sensing sensor 711 is inserted into the sliding groove 717 and grounded.

Therefore, it is possible to sense the leakage current from the ground wire while being rotated by the operator.

A seating groove portion 719 is formed at both ends of the main body case 712 to insert the end portion of the current detecting sensor 711. The seating groove portion 719 has a first engagement groove portion 714a into which the ground plate 715 is inserted, 2 coupling groove portion 714b.

The cap member 812 is slid on the upper portion of the seating groove portion 719 and a discharge groove portion 719a which can be separated from the seating groove portion 719 is formed.

Since the separation preventing portions 810 are provided at both ends of the current sensing sensor 711 to prevent the current sensing sensor 711 from being separated from the seating recess 719, the electrical connection between the grounding plate 715 and the current sensing sensor 711 The connection state is maintained.

The separation preventing portion 810 includes a cap member 812 having a locking protrusion formed so as to protrude and retract from the end of the current detecting sensor 711 and a step portion 816 to which the locking protrusion is slidably inserted and is engaged with the locking protrusion, And an elastic member 818 which is interposed between the locking projection and the stepped portion 816 and presses the cap member 812 outward from the current sensing sensor 11.

Therefore, when the current sensing sensor 711 is seated in the main body case 712, the cap member 812 is protruded by the pressing force of the elastic member 818 and maintained in contact with the inner wall of the case main body and the battery plate do.

The replacing unit 570 includes a pair of disc members 772 having a plurality of grooves formed thereon so that the plurality of current detecting sensors 711 are seated therebetween and a rotating shaft 772c And a nut coupling portion 784 is provided at a central portion of the disc member 772 so that a pinion 782 inserted from the outer wall of the main body case 712 is coupled and driven.

When the current sensor 711 is removed from the main body case 712 and replaced, the lever member 780 and the pinion 782 are inserted into the main body case 712 such that the pair of current sensors 711 are exposed on the upper surface of the main body case 712, Hole 786 formed at both ends of the disk 712 and inserted into the nut coupling portion 784 formed on the outer wall of the disk member 772. [

The pinion 782 mounted on the lever member 780 is inserted into the body case 712 through the through hole portion 786 and is engaged with the disk member 772 and then the lever member 780 is rotated, The current sensing sensor 711 desired by the operator is exposed through the opening in the upper portion of the main body case 712 while the worker moves one of the current sensing sensors 711 from the main body case 712 to the discharge recess 719a The remaining current sensing sensor 711 senses the leakage current while maintaining a state of being in contact with the ground plate 715 and the grounding block 716. [

Reference numerals 714c and 714d denote a first interference groove portion 714c and a second interference groove portion 714d for preventing a cable connected to the ground plate 715 from interfering with the cable and the main body case 712 .

Reference numerals 772a and 772b denote a first groove portion 772a and a second groove portion 772b formed in the disk member 772 and on which a plurality of current sensing sensors 711 are mounted.

A first groove portion 772a and a second groove portion 772b may be formed in the disk member 772 of the present embodiment so that a pair of current sensing sensors 711 may be provided and the first groove portion 772a and the second groove portion 772b may be provided, The current sensor 711 of the pair of current sensors 711 rotates the lever member 780 so that the current sensor 711 of the pair of current sensors 711 is connected to the ground block 716 When the disk member 772 is rotated so as to be disposed at the lower portion of the main body case 712, one current sensing sensor 711 of the pair of current sensing sensors 711 is disposed on the upper side of the opening of the main body case 712, 720 are separated from the sliding groove portion 717.

Therefore, while one of the current sensors 711 is electrically connected to perform a leakage detection operation, the current sensor 711 of the other one of the pair of current sensors 711, The current sensor 711 is exposed to the outside through the opening in the upper portion of the main body case 712 and the current sensor 711 disposed on the upper side is pulled toward the upper side of the main body case 712, So that it can be easily replaced while being separated.

As described above, when the operator pulls the current sensing sensor 711 to the upper side of the main body case 712 using a tool or a hand with insulating gloves, the elastic member 818 provided at both ends of the current sensing sensor 711 is compressed The ground plate 715 which is in close contact with both ends of the current sensing sensor 711 generates current sensed by the current sensing sensor 711 interposed between the pair of ground plates 715, Can be separated to the outside through the opening in the upper part of the main body case 712.

As described above, while one of the pair of current sensing sensors 711 is electrically connected to the current sensing sensor 711 to perform the leakage sensing operation, the other current sensing sensor 711 The current sensor 711 is exposed to the outside through the opening in the upper portion of the main body case 712 and pulls the current sensing sensor 711 disposed on the upper side of the main body case 712 to the upper side of the main body case 712, The current sensing sensor 711 can be easily replaced while being separated from the outside.

At this time, when the worker pulls the current sensor 711 to the upper side of the main body case 712 using a tool or a hand with insulating gloves, the elastic member 818 provided at both ends of the current sensor 711 is compressed, The ground plate 715 which is in close contact with the both ends of the sensing sensor 711 generates both ends of the current sensing sensor 711 and a clearance so that the current sensing sensor 711 interposed between the pair of ground plates 715, And can be separated to the outside through the opening in the upper part of the case 712 and the discharge groove 719a.

Thus, the sensing operation of the leakage current sensing unit 510, which is connected to a plurality of ground lines and converts the measured current into a predetermined digital signal, is not interrupted, and the leakage current sensing unit 510 can be easily replaced It is possible to provide an electrical switchboard which can easily be replaced with a grounded wire leakage current sensing unit 510. [

In addition, as shown in FIG. 10, the switchboard according to the present invention is provided with a plurality of exhaust fans 400 on the upper and lower sides and the left and right sides of the case 100.

First, a case 100 of the switchboard is provided with a plurality of exhaust ports on the upper and lower sides and left and right sides, respectively, and a reverse flow prevention valve 600 is installed in each of the exhaust ports. Inside the reverse flow prevention valve 600, (400) is rotatably installed.

The structure of the check valve 600 can be variously attempted. However, in the present invention, the blocking plate 630, which is rotatable by the rotation axis 610, is structured to block the exhaust port in a slightly inclined state.

Since the air pressure inside the switchboard becomes higher than the external air pressure due to the state of blocking the exhaust port by the load of the blocking plate 630 itself, the load of the blocking plate 630 The inside air can be discharged to the outside.

In other words, when the exhaust fan 400 is operated, the air inside the switchboard is introduced into the exhaust port, and the shutoff plate 630 of the check valve 600 is pushed out and discharged to the outside. When the operation of the exhaust fan 400 is stopped The outside air is prevented from flowing into the interior of the switchboard 100 because the vent hole is closed by the load of the blocking plate 630 itself.

As described above, according to the present invention, it is possible to simplify the construction, to install the light fittings more quickly, to improve the safety due to the excellent insulation property, to provide a stable installation of light fittings It is possible to maintain the state constantly and to adjust the installation height of the light guide plate in the vertical direction appropriately.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It will be readily apparent that various substitutions, modifications, and alterations can be made herein.

10,10a: front and rear electric pole fixing frame 11: semicircular ring portion
11a: band ring groove 12: non-slip band
13: Anchor bolt 13a: Bolt hole
13b: fastening nut 14, 14a:
15,15a: square hole 20,20a:
21: fastening hole 22: stop bolt
30: Telephone pole 40: Power line
41: Line post insulator

Claims (3)

A half-circle ring portion which surrounds the outer periphery of the main body is formed at the center, and the inner side faces of the half-circle ring portions on the left and right sides correspond to the front and rear sides of the half- A front and rear electric pole fixed frame formed with an anchor bolt and a bolt hole to be fastened and fixed by a coupling nut, and a rectangular light pole fixed to the front and rear electric pole fixing frame,
Wherein the front and rear electret frame fixing sockets are insulative slip-resistant bands inserted into the band ring grooves formed in the periphery of the semicircular ring portion to be in close contact with the mainsheet, and left and right inserting protruding portions projecting upwardly from the upper ends of left and right side front ends, The rectangular light pipe is elastically bent outwardly and backwardly by elasticity, and is inserted and fixed in the front and rear sides of the square holes of the front and rear electric pole fixture so as to be vertically fastened. A plurality of stop bolts formed at predetermined intervals in the right and left sides and screwed to the fastening holes on the left and right sides to prevent the left and right sides of the front and rear electric poles fixed to the outside by elasticity, Position adjustable to the side wall fixture Characterized in that the gold gyeongwan connector for cable wires, characterized in, and;
Wherein a wire cable connected to a telephone pole provided with a light guide connecting device for the wire cable is extended and connected, and an underground distribution cable and a switchboard for distribution connection are provided apart from the telephone pole; Wherein the switchboard comprises a door, a case extended from the electric pole and connected to the inside and a ground distribution cable are connected to each other; The switchboard includes a leakage current sensing unit connected to the wire cable and a plurality of ground lines connected to the underground distribution cable to convert a measured current into a predetermined digital signal, a relay circuit unit for selectively inputting / outputting a current measured at each ground line, An input unit for setting an operation reference value to be compared with a digital signal of a current measured through the ground line; a control unit for determining a state of a ground line by comparing the digital signal measured at the ground line with the operation reference value; An alarm unit for generating an alarm signal for the state; And a display unit for displaying a state of a ground wire according to a judgment of the control unit and a leakage current value measured at a ground line; The leakage current sensing unit includes a main body case mounted on the ground and having a space therein, a first coupling recess formed in both ends of the main body case, and a ground plate connected to the ground line, A current sensing sensor installed in the main body case and electrically connected to the ground plate to sense the electroluminescence current and transmit a sensing signal, and a current sensing sensor electrically connected to the current sensing sensor, A ground block for transmitting a signal to be transmitted; and a replacement unit for maintaining a state in which the current sensing sensor is accommodated in the main body case when the current sensing sensor is detached from the main body case.
Wherein a seating groove portion is formed at both ends of the main case case to insert an end portion of the current sensing sensor and the seating groove portion is connected to the first joining groove portion and the second joining groove portion into which the ground plate is inserted, Cable clamp for cable. delete [2] The apparatus according to claim 1, wherein the replacement unit includes a pair of disk members having a plurality of grooves formed thereon so as to receive a plurality of current sensors, and a rotation shaft connecting the disk members and rotatably arranging the disk members, Wherein a nut coupling portion is provided at a center portion of the main body case so that a pinion inserted from an outer wall of the main body case is coupled and driven.

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