KR102121046B1 - Fault detector for composite transmission line - Google Patents

Abstract

The present invention relates to a fault detector for a composite transmission line to correctly determine the location of a power transmission line from which a fault current is generated. According to the present invention, the fault detector comprises: a fault current collection unit receiving fault currents from a first sensor unit installed on an input side of a ground power transmission line and a second sensor unit installed on an output side of the ground power transmission line; a fault current synchronization unit synchronizing the fault currents collected in the fault current collection unit; a current direction detection unit detecting the current direction of the fault current synchronized in the fault current synchronization unit; and a fault section detection unit detecting one from an overhead power transmission line and the ground power transmission line as a fault section; and a fault location detection unit detecting the fault location based on a phase change in the fault current synchronized in the fault current synchronization unit.

Description

Complex transmission line failure detection device {FAULT DETECTOR FOR COMPOSITE TRANSMISSION LINE}

The present invention relates to a complex transmission line fault detection device, and more specifically, to accurately detect the location of a transmission line where a fault current is generated by detecting a fault current in a complex transmission line comprising an overhead transmission line and an overhead transmission line. The present invention relates to a complex transmission line failure detection device capable of easily installing a failure detection device on an existing composite transmission line.

In general, the underground transmission line is a power cable that transmits an ultra-high voltage, and is installed in a power supply.

Conventionally, in order to check for the prevention of accidents on the underground transmission line, an inspector enters and exits the electric power outlet, and the underground transmission line is visually inspected or performed in the form of measurement by measurement equipment.

However, due to the nature of the underground pipeline, there are problems in terms of safety of inspectors and reliability of work, and there is a problem of manpower consumption due to the need to perform preventive maintenance management at all times.

In addition, even if the power facilities such as ventilation facilities and lights in the power zone do not operate normally, there is a problem that cannot be confirmed if the operator does not directly access the power zone.

Inspection of the underground transmission line through existing measurement equipment was performed mainly on the connection part of the cable with high potential for partial discharge, but as external damage factors such as road vibration gradually increased, the inspection system centered on the connection part expanded across the entire underground transmission line. Need to be.

In other words, it is necessary to build a line-based inspection system, away from the existing node-oriented inspection environment.

In addition, the current power system has reduced the margin of power supply and transportation infrastructure due to the worsening of the supplier's conditions, such as an increase in potential demand and an increase in demand for minimization of transmission restrictions. It would be urgent to develop a surveillance diagnostic system.

In order to solve the above problems, an underground transmission line monitoring and diagnosis system has been developed, and the monitoring and diagnosis system according to the prior art includes a sensor unit for sensing the state of the underground transmission line and sensing information of the underground transmission line detected by the sensor unit. At least one of a collection data collection device, an upper server that receives sensing information from the data collection device, and monitors the state of the underground transmission line based on the sensing information, and at least one of an operating state of a ventilation facility and a lighting system, which is a power facility in the power zone. It includes a control unit for generating the operation status information, the data collection device further collects the operation status information of the control unit, the upper server generates a control signal that can control the power equipment.

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-1183587 (published on September 17, 2012, the name of the invention: ultra high voltage underground transmission line monitoring diagnostic system and method).

The system according to the prior art is equipped with a technology configuration capable of detecting a failure of an underground transmission line, whereas a technology configuration capable of detecting a failure of an overhead transmission line is not provided to detect a failure of a complex transmission line. There are difficult problems.

Therefore, there is a need to improve this.

The present invention can accurately determine the location of a transmission line where a fault current is generated by detecting a fault current in a complex transmission line provided with an overhead transmission line and an underground transmission line, and it is easy to detect a fault in an existing complex transmission line. An object of the present invention is to provide a fault detection device for a complex transmission line that can be easily installed.

The present invention, in the complex transmission line fault detection apparatus for detecting a failure in the complex transmission line and the underground transmission line is a mixed transmission line, the first sensor unit installed on the input side of the underground transmission line and the underground transmission line A fault current collecting unit collecting fault current from a second sensor unit installed on the output side; A fault current synchronization unit synchronizing the fault current collected by the fault current collection unit; A current direction detection unit detecting a current direction of the fault current synchronized by the fault current synchronization unit; A failure section detecting unit detecting one of the overhead power transmission line and the underground transmission line as a failure section based on the current direction detected by the current direction detection unit; And a fault position detecting unit detecting a fault location based on a phase change of the fault current synchronized by the fault current synchronization unit when the fault transmission section detects the underground transmission line as a fault section, and the first sensor unit and The second sensor unit is composed of a current transformer sensor, the current transformer sensor, a coil member bent in a ring shape to surround the underground transmission line; An elastic pipe formed of a straight pipe shape so that the coil member is wound, and made of an elastic material so that it can be bent into a ring shape after the coil member is wound; A case body having a ring-shaped storage space for accommodating the elastic pipe bent in a ring shape and the coil member, and having a through-hole portion through which the underground transmission line penetrates; An opening/closing case installed to be opened and closed on the incised portion of the case body, and a portion of the elastic pipe and the coil member is received; After the elastic pipe and the coil member are accommodated in the case body and the opening/closing case, the opening of the case body and the opening/closing case is closed so that the elastic pipe and the coil member are discharged outside the case body and the opening/closing case. Preventing the cover portion; And it characterized in that it comprises a removable portion for connecting or separating the cover portion and the case body and the opening and closing case.

In addition, when the first sensor unit and the first sensor unit are installed on the underground transmission line of the present invention, the opening and closing case is opened apart from the case body while the cover is separated from the case body and the opening and closing case. Later, the case body and the opening/closing case are mounted on the underground transmission line, and the opening/closing case is combined with the case body to be formed in the center of the case body and the opening/closing case while the case body and the opening/closing case are combined. The first sensor unit and the second sensor unit may be installed on the underground transmission line in a shape in which the underground transmission line passes through the through-hole.

In addition, the elastic pipe of the present invention is made of a synthetic resin or ceramic material including an insulating material that does not flow current, and an elastic material that can be deformed into a circular shape, and is made of a pipe shape in which a hollow is formed, and the coil It is characterized in that it is made of a straight pipe shape so that the member can be wound on the elastic pipe at uniform intervals.

In addition, the cover portion of the present invention is formed in a semicircle shape, a first cover in which a groove portion is formed in the center portion; And a second cover formed in the same shape as the first cover and disposed symmetrically to the first cover to be coupled to the case body and the opening/closing case, the case body and the opening/closing being installed on the underground transmission line. After opening the coil member and the elastic pipe inside the case, it is characterized in that the opening of the case body and the opening and closing case is closed by the cover portion.

The complex transmission line fault detection apparatus according to the present invention determines whether a fault occurs in the underground transmission line and the overhead transmission line based on the fault current detected by the current transformer sensors installed in the underground transmission line, and fails when the underground transmission line fails. By specifying a point, there is an advantage that it is possible to quickly and accurately specify a failure point while determining a failure section of the overhead power transmission line and the underground transmission line.

In addition, the complex transmission line fault detection apparatus according to the present invention is a fault occurring in the overhead power transmission line when the direction of the fault current measured through the current transformer sensors installed at both ends of the main line of the underground transmission line does not match, the direction of the fault current If this coincides, there is an advantage that can be determined as a failure occurring in the underground transmission line.

In addition, in the complex transmission line fault detection apparatus according to the present invention, the first sensor unit and the second sensor unit installed on the underground transmission line are formed by winding the coil member around the elastic pipe formed in a straight line, and the coil member The first sensor part and the second sensor part of the present invention are installed in an existing underground power transmission line because the winding elastic pipe is bent in a ring shape to provide a ring-shaped interior space and to be installed in the case body and the opening/closing case arranged to surround the underground power transmission line. There is an advantage in that a failure detection device can be implemented by installing a sensor unit.

In addition, the complex transmission line fault detection apparatus according to the present invention is provided with a cover portion so as to replace the elastic pipe and the coil member installed inside the case body and the opening and closing case, and has a detachable portion to maintain the closed state of the cover portion, so the coil When the life of the member ends, the operator has the advantage of separating the cover part from the case body and the opening and closing case by manipulating the detachable part and easily replacing the elastic pipe and coil member.

In addition, the complex transmission line fault detection apparatus according to the present invention is provided with a release unit capable of separating the cover member from the case body and the opening/closing case in one operation, so that the operator operates the release unit when replacing the coil member whose life has ended. Thus, it is possible to release the restraining state of the cover portion by the detachable portion, thereby reducing the time and cost of replacing the first sensor portion and the second sensor portion.

1 is a configuration diagram showing a complex transmission line fault detection apparatus according to an embodiment of the present invention.
2 is a block diagram showing a complex transmission line fault detection apparatus according to an embodiment of the present invention.
3 is an exploded perspective view of a sensor unit of a complex transmission line fault detection apparatus according to an embodiment of the present invention.
Figure 4 is an exploded perspective view showing the case body and the opening and closing case of the complex transmission line fault detection apparatus according to an embodiment of the present invention.
5 is a cross-sectional view illustrating a detachable part and a released part of a complex transmission line fault detection apparatus according to another embodiment of the present invention.

Hereinafter, an embodiment of a complex transmission line fault detection apparatus according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice.

Therefore, the definition of these terms should be made based on the contents throughout the specification.

1 is a block diagram showing a complex transmission line failure detection device according to an embodiment of the present invention, Figure 2 is a block diagram showing a complex transmission line failure detection device according to an embodiment of the present invention, Figure 3 Is an exploded perspective view showing a sensor part of a complex transmission line failure detection device according to an embodiment of the present invention, and FIG. 4 is a case body and an opening and closing case of a complex transmission line failure detection device according to an embodiment of the present invention. It is an exploded perspective view.

1 to 4, the complex transmission line fault detection apparatus according to an embodiment of the present invention includes a fault current collection unit 110, a fault current synchronization unit 130, a current direction detection unit 150, and a fault section It includes a detection unit 170 and a fault location detection unit 190.

The fault current collecting unit 110 collects fault currents from the first sensor unit 52 composed of the input-side current transformer sensors installed on the underground transmission line 30 of the complex transmission line and the second sensor unit 54 composed of the output-side current transformer sensors. In this case, the fault current collection unit 110 collects fault currents from the first sensor unit 52 and the second sensor unit 54 installed on the main line of the underground transmission line 30.

Here, the first sensor unit 52 and the second sensor unit 54 are installed at both ends of each phase of the main line of the underground transmission line (30).

In order to calculate a more accurate fault location, a fault voltage for each phase of the common phase calculated along with the fault current is required. Therefore, the fault current collection unit 110 may be used for a transformer channel or bus transformer panel of a fault recorder in a corresponding substation in which a master device is installed. Transformers can also be collected in parallel.

The fault current collecting unit 110 installed on the underground transmission line 30 collects fault currents from the first sensor unit 52 and the second sensor unit 54.

The first sensor unit 52 is installed on the input side of the underground transmission line to detect a fault current, and the second sensor unit 54 is installed on the output side of the underground transmission line to detect the fault current.

The first sensor unit 52 and the second sensor unit 54 transmit the detected fault current to the fault current collection unit 110, and the fault current collection unit 110 includes the first sensor unit 52 and the first sensor unit 52. 2 The fault current collected from the sensor unit 54 is transmitted to the fault current synchronization unit 130, and at this time, the fault current collection unit 110 transmits at least one of the fault currents to the fault current synchronization unit 130.

The fault current synchronization unit 130 synchronizes the fault current collected by the fault current collection unit 110 using a synchronization signal output from the GPS satellite.

The fault current synchronization unit 130 synchronizes the fault current collected on the same phase among the fault currents collected by the fault current collection unit 110.

The current direction detection unit 150 detects the current direction of the fault current synchronized by the fault current synchronization unit 130.

The failure section detector 170 detects a failure section based on the current direction of the fault current detected by the current direction detector 150.

The failure section detection unit 170 determines that a failure has occurred in any one of the overhead transmission line 10 or the underground transmission line 30 based on the current direction of the failure current.

The failure section detection unit 170 determines that a fault occurs in the underground transmission line 30 when the current directions of the fault currents match, and the failure section detection unit 170 determines whether the current direction of the fault currents does not match the overhead power transmission line 10 It is judged as a failure occurrence.

When the fault location detecting unit 190 determines that the underground transmission line 30 is a fault in the fault section detecting unit 170, the fault current synchronization unit 130 detects the fault location based on the phase change of the synchronized fault current.

The fault location detector 190 detects a fault distance based on a phase change of a fault current generated in the event of a short circuit or a ground fault in the transmission line, and the fault position detector 190 is a phase measurement device (PMU, Phasor Measurement) of the current transformer sensor. Unit) to calculate the failure distance using the measured PMU data.

In the absence of an accident, the same phase is measured at both ends of the bus line in the transmission line, and in the event of an accident, the phase where the phase change (ie, phase angle change) is measured at both ends of the transmission line bus line is measured.

Thus, the fault location detector 190 detects a fault distance based on the phase change of the synchronized fault current, and the fault position detector 190 uses the phase angle change of the fault current and the generation time of the fault current to determine the fault distance. To detect.

Here, the generation time of the fault current is a time measured by the GPS time when the fault current occurs.

The fault location detecting unit 190 uses the following equation (1) to calculate the fault distance as an example.

That is, the fault location detecting unit 190 simultaneously records the time-tag of the GPS time-synchronized fault current (i.e., PMU data) that is sampled at high speed (≥128 samples/cycle) with a precise PT/CT of the terminal when a fault occurs. X).

The fault location detecting unit 190 calculates the fault distance X using the time difference (tb-ta) at both ends of the moving speed C of the charge through the resolution of the microsecond (μS) in the event of a transient accident.

Equation 1

Here, X is the failure distance, L is the distance of the busbar (distance between the current transformer sensors installed at both ends of the busbar), C is the moving speed of the charge, (tb-ta) means the time difference between both ends.

The fault location detection unit 190 detects the fault location using the calculated fault distance and the length of the busbar (ie, the distance between the current transformer sensors installed at both ends of the busbar).

The fault current collection unit 110 collects fault currents from a plurality of current transformer sensors installed in the underground transmission line 30 of the complex transmission line.

That is, the fault current collection unit 110 collects fault currents from a plurality of current transformer sensors installed on the main line of the underground transmission line 30. Here, a plurality of current transformer sensors are installed at both ends of each phase of the main line of the underground transmission line (30).

The fault current collection unit 110 collects fault currents from the first sensor unit 52 and the second sensor unit 54 installed at both ends of the underground transmission line 30, and at least one of the fault currents is a fault current synchronization unit (130).

The fault current synchronization unit 130 synchronizes the fault current using a synchronization signal output from the GPS satellite.

The fault current synchronization unit 130 synchronizes the fault current collected on the same phase among the fault currents collected by the fault current collection unit 110.

The current direction detection unit 150 detects the current direction of the synchronized fault current. That is, the current direction detection unit 150 detects the current direction of the fault current synchronized by the fault current synchronization unit 130.

The failure section detection unit 170 detects a failure section based on the current direction of the failure current. That is, the failure section detection unit 170 determines that a failure has occurred in any one of the overhead transmission line 10 or the underground transmission line 30 based on the current direction of the failure current. At this time, the failure section detection unit 170 judges that the failure of the underground transmission line 30 occurs when the current direction of the fault current coincides, and the failure section detection unit 170 does not match the current direction of the fault current transmission line ( 10).

When the failure section detection unit 170 determines that the underground transmission line 30 is a failure, the failure location detection unit 190 detects a failure location based on the phase change of the synchronized failure current.

That is, the fault position detection unit 190 detects a fault distance using the phase angle change of the fault current and the generation time of the fault current.

Here, the generation time of the fault current is a time measured by the GPS time when the fault current occurs.

The fault location detection unit 190 calculates a fault distance using the distance of the busbar, the speed of movement of the charge, and the time difference between both ends.

The fault position detection unit 190 calculates a fault distance by dividing the difference between the moving speed of the electric charge and the time difference between both ends and the distance of the busbar.

The fault location detection unit 190 detects the fault location using the calculated fault distance and the length of the busbar (ie, the distance between the current transformer sensors installed at both ends of the busbar).

As described above, the complex transmission line failure detection device and method determine whether a failure occurs in the underground transmission line and the overhead transmission line based on the fault current detected by the current transformer sensors installed in the underground transmission line, and the failure of the underground transmission line By specifying the failure point in the city, it is possible to quickly and accurately specify the failure point while determining the failure section of the overhead power transmission line and the underground transmission line.

In addition, if the direction of the fault current measured through the current transformer sensors installed at both ends of the main line of the underground transmission line does not match, the fault detection device and method of the complex transmission line is a fault that occurred in the overhead power transmission line, and if the direction of the fault current matches There is an effect that can be determined as a failure occurring in the underground transmission line.

The first sensor unit 52 and the second sensor unit 54 of this embodiment are made of a current transformer sensor, and the current transformer sensor includes a coil member 77 that is bent in a ring shape to surround the underground transmission line 30 and , Elastic pipe 76 made of an elastic material so that the coil member 77 is formed in a straight pipe shape to be wound, and bent in a ring shape after the coil member 77 is wound, and an elastic pipe bent in a ring shape A case body 70 having a ring-shaped storage space for accommodating the 76 and coil member 77, and having a through-hole 71 through which the underground transmission line 30 passes through the central circumference, The opening and closing case 72 is installed to be opened and closed on the incised portion of the case body 70, and a portion of the elastic pipe 76 and the coil member 77 is received, and the elastic pipe 76 and the coil member 77 After receiving the case, the opening of the case is closed to connect or disconnect the cover portion 80 and the cover portion 80 to prevent the elastic pipe 76 and the coil member 77 from being discharged to the outside of the case. It includes a removable portion (86).

Therefore, when installing the first sensor unit 52 and the first sensor unit 52 on the existing underground power transmission line 30, the operator removes the cover 80 from the case, and opens and closes the case 72. After opening to be spaced apart from (70), the case body (70) and the opening/closing case (72) are mounted on the underground transmission line (30), and the opening/closing case (72) is combined with the case body (70) to rebuild the case body (70). ) And the opening/closing case 72 are coupled, the case can be installed on the underground transmission line 30 in a shape in which the underground transmission line 30 is passed through the through-hole portion 71 formed in the case central portion.

Thereafter, the coil member 77 and the elastic pipe 76 are seated in the inner space of the case. The elastic pipe 76 is a synthetic resin comprising an insulating material that does not flow current and an elastic material that can be deformed into a circular shape. It is made of ceramic material, is made of a pipe shape in which a hollow is formed, and is made of a straight pipe shape so that the coil member 77 can be wound around the elastic pipe 76 at uniform intervals.

At this time, the operator winds the coil member 77 around the elastic pipe 76 at regular intervals by hand or by using an automatic device for winding the coil member 77 at regular intervals, and the coil member 77 where the winding is completed. By inserting the end of the elastic pipe 76 into the inside, both ends of the coil member 77 are formed to extend in the same direction.

After receiving the coil member 77 and the elastic pipe 76 inside the case installed in the underground transmission line 30, the opening of the case is closed by the cover portion 80, the cover portion 80, The first cover 82 is formed in a semicircle shape and a groove is formed in the center portion, and the second cover is formed in the same shape as the first cover 82 and symmetrically disposed with the first cover 82, and is coupled to the case. (84).

Therefore, the opening of the case is closed by coupling the first cover 82 and the second cover 84 to the opening of the case in which the coil member 77 is accommodated.

In addition, the removable portion 86 of the present proposal, the hook member 87 protruding from the first cover 82 and the second cover 84, and the hook member 87 is inserted into the first cover 82 and It includes a restraining groove portion 88 for coupling the second cover 84 to the case.

In addition, in the first cover 82 of the present embodiment, an inlet groove portion 89 is formed so that both ends of the coil member 77 are discharged to the outside of the case through the inlet groove portion 89, and a pair of coil member 77 ends Is connected to the terminal member 78 and the terminal member 78 is connected to a separate control unit.

5 is a cross-sectional view illustrating a detachable part and a released part of a complex transmission line fault detection apparatus according to another embodiment of the present invention.

Referring to FIG. 5, the detachable portion of the complex transmission line fault detection apparatus according to the present invention includes a hook member 87 protruding from the first cover 82 and the second cover 84, and a hook member 87 Constrained groove portion 88 that is coupled to the first cover 82 and the second cover 84 to the case, and is installed to be recessed inside the constrained groove portion 88, and a hooking hook 89b engaged with the hook member 87 ), and an elastic member (89a) for providing an elastic force to press the engaging hook (89b) into the restraining groove (88).

Therefore, when the cover portion is pressed toward the openings of the case body and the opening/closing case, the hook member 87 is inserted into the restraining groove portion 88 to press the hooking hook 89b into the working space portion, and the elastic member 89a is compressed while hooking. When the member 87 is inserted to the inner end of the restraining groove portion 88, and the insertion of the hook member 87 is completed, the locking hook 89b protrudes into the restraining groove portion 88 by the restoring force of the elastic member 89a. It is engaged with the hook member 87 to maintain the closed state of the cover.

In addition, the present embodiment further includes a release part 90 to release the closed state of the detachable part so that the hook member 87 can be separated from the restraining groove part 88 outside, and the release part 90 of the present embodiment. The winding hook (89b) from the rear of the restraining groove portion (88) extending outwardly, and the plurality of release wires (92) extending from each of the restraining groove portion (88), take up the case body or open/close case It includes a take-up drum 94 that is rotatably installed on, and a lever member 96 that rotates the take-up drum 94 and pulls the release wire 92 to retract the hook 89b.

Therefore, after inserting the insertion block 96a provided at the end of the lever member 96 into the insertion groove 94a of the winding drum 94, rotating the lever member 96 to rotate the winding drum 94 causes the winding drum 94 to rotate. While the plurality of release wires 92 are simultaneously wound on the 94, the hook hooks 87b and 89b of the hook members 87 and the hooks 89b while retracting the hooks 89b installed in the respective restraining grooves 88 into the working space part are retracted. It will release the jamming.

Therefore, the operator can easily perform the separation operation of the cover portion while simultaneously releasing the restrained state of the plurality of hook members 87 by one operation of rotating the lever member 96.

In this way, it is possible to accurately determine the location of the transmission line where the fault current is generated by detecting the fault current in the complex transmission line provided with the overhead transmission line and the underground transmission line, and easily detect the failure device in the existing complex transmission line. It is possible to provide a fault detection device for a composite transmission line that can be installed.

The present invention has been described with reference to one embodiment shown in the drawings, but this is only exemplary, and those skilled in the art to which the art pertains are capable of various modifications and other equivalent embodiments. Will understand

In addition, the complex transmission line failure detection device has been described as an example, but this is only an example, and the detection device of the present invention may be used for other products other than the fault detection device for the transmission line.

Therefore, the true technical protection scope of the present invention should be defined by the claims below.

10: overhead power transmission line 30: underground transmission line
52: first sensor unit 54: second sensor unit
70: case body 72: opening and closing case
74: hinge 76: elastic pipe
77: coil member 78: terminal member
80: cover portion 82: first cover
84: second cover 86: detachable portion
87: hook member 88: restraint groove
89: inlet groove 89a: elastic member
89b: Hook hook 90: Release part
92: release wire 94: winding drum
94a: insertion groove 96: lever member
96a: Insertion block

Claims (4)

In the complex transmission line fault detection device for detecting a failure in the complex transmission line mixed with overhead transmission line and overhead transmission line,
A fault current collecting unit collecting fault current from a first sensor unit installed on the input side of the underground transmission line and a second sensor unit installed on the output side of the underground transmission line;
A fault current synchronization unit synchronizing the fault current collected by the fault current collection unit;
A current direction detection unit detecting a current direction of the fault current synchronized by the fault current synchronization unit;
A failure section detecting unit detecting one of the overhead power transmission line and the underground transmission line as a failure section based on the current direction detected by the current direction detection unit; And
And a fault position detecting unit detecting a fault location based on a phase change of the fault current synchronized by the fault current synchronization unit when the fault transmission section detects the underground transmission line as a fault section,
The first sensor unit and the second sensor unit is made of a current transformer sensor,
The current transformer sensor,
A coil member bent in a ring shape to surround the underground transmission line;
An elastic pipe formed of a straight pipe shape so that the coil member is wound, and made of an elastic material so that it can be bent into a ring shape after the coil member is wound;
A case body having a ring-shaped storage space for accommodating the elastic pipe bent in a ring shape and the coil member, and having a through-hole portion through which the underground transmission line penetrates;
An opening/closing case installed to be opened and closed on the incised portion of the case body, and a portion of the elastic pipe and the coil member;
After the elastic pipe and the coil member are accommodated in the case body and the opening/closing case, the opening of the case body and the opening/closing case is closed so that the elastic pipe and the coil member are discharged outside the case body and the opening/closing case. Preventing the cover portion; And
It includes a removable portion 86 for connecting or separating the cover portion and the case body and the opening and closing case,
When the first sensor part and the first sensor part are installed on the underground transmission line, the case body is opened after the cover part is separated from the case body and the open/close case, and the open/close case is spaced apart from the case body. The opening/closing case is mounted on the underground transmission line, and the opening/closing case is combined with the case main body through a through-hole formed in a central portion of the case body and the opening/closing case in a state where the case body and the opening/closing case are combined. The first sensor unit and the second sensor unit may be installed on the underground transmission line in a shape in which the underground transmission line passes.
The elastic pipe is made of a synthetic resin or ceramic material including an insulating material that does not flow current, and an elastic material that can be deformed into a circular shape, and is made of a pipe shape in which a hollow is formed, and the coil member is uniformly spaced. As it is made of a straight pipe shape to be wound on the elastic pipe,
The cover portion,
A first cover 82 formed in a semicircle shape and having a groove in a central portion; And
It is formed in the same shape as the first cover 82 and disposed symmetrically to the first cover 82, and includes a second cover 84 coupled to the case body and the opening and closing case,
After receiving the coil member and the elastic pipe inside the case body and the opening and closing case installed on the underground transmission line, the opening of the case body and the opening and closing case is closed by the cover portion,
The detachable portion 86,
A hook member 87 protruding from the first cover 82 and 82 and the second cover 84;
The hook member 87 is inserted to constrain the groove 88 for coupling the first cover 82, 82 and the second cover 84 to the case body and the opening and closing case;
A locking hook 89b installed to be recessed inside the restraining groove portion 88 and engaged with the hook member 87; And
It includes an elastic member (89a) for providing an elastic force to press the engaging hook (89b) to the restraining groove (88) inside,
Further comprising a release portion 90 to release the closed state of the detachable portion to separate the hook member 87 to the restraining groove portion 88,
The release unit 90,
A release wire 92 extending from the rear surface of the engaging hook 89b to the outside of the restraining groove 88;
A winding drum 94 wound around the plurality of release wires 92 extending from each of the restraining grooves 88 and rotatably installed in the case body or the opening and closing case;
And a lever member (96) for retracting the hook (89b) while pulling the release wire (92) by rotating the winding drum (94). delete delete delete

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