KR20230018030A - Safety cutter for power cable live line confirmation - Google Patents

Abstract

The present invention relates to the structure of a safety cutter for a live line confirmation power cable. When an electroscopic measurement band (40) is fastened to the outer diameter of a concentric neutral line power cable, an electroscopic needle unit (42) installed on the inner peripheral surface of the electroscopic measurement band (40) penetrates through the outer layer of the concentric neutral line power cable (20) to reach a position contacting a semiconducting layer (5) or an insulating layer (3), so that electric charges are induced to the electroscopic needle unit (42) by an electrostatic induction phenomenon. When the induced electric charges are detected by an electroscopic unit (50) and the state of a live wire is determined, the operation of a driving unit (30) is stopped through a control unit (60). Thus, the cutting operation of cutting knives (10a, 10b) can be automatically stopped. When it is required to cut and remove a previously installed concentric neutral power cable (20) to replace or extend the concentric neutral power cable (20), even if an operator or a supervisor desires to cut the concentric neutral power cable (20) in a live state due to illusion of drawing information, if the concentric neutral power cable (20) is in a live state, the safety cutter can block an operating of cutting the concentric neutral power cable (20) in advance, thereby preventing electrical accidents and power outages.

Description

Safety cutting machine for life and death checking power cables {SAFETY CUTTER FOR POWER CABLE LIVE LINE CONFIRMATION}

The present invention relates to a safety cutting machine for a life and death checking power cable, and more particularly, to a safety cutting machine for a life and death checking power cable, which allows operation to be performed after checking the life and death state according to whether electricity is pressurized when cutting an underground extra-high voltage cable. .

In general, undergrounding of distribution lines is almost completed in urban areas and specific aesthetic districts. KEPCO's underground special high-tension lines use 22.9kV Concentric Neutral Type Cross-linked Polyethylene Insulated Vinyl Sheathed Cable (CNCV). ) is being used.

As shown in FIG. 1, the concentric neutral power cable (CNCV) has a multi-layered structure concentrically arranged from the inside to the outside, including a conductor layer (1), a conductor shielding layer (2) of an internal semiconductor, an insulator layer ( 3), it is composed of an external semiconductor insulation shielding layer (4), a semi-conductive layer (5), a concentric neutral layer (6), a non-conductive layer (7) and an outer layer (8).

Looking at the method of installing a concentric neutral power cable in an underground distribution line, a method of laying through a power outlet or a common outlet, burying a conduit in the ground and entering the conduit, or using a method of directly burying it in the ground. In addition, in the pipeline method or the direct sales method, manholes are installed at predetermined distances to facilitate cable laying, cable branching, and maintenance.

The underground distribution lines installed in this way cannot be permanent, and work such as replacement work due to secular change, replacement work due to capacity increase, repair work due to accidents, etc. is often necessary.

However, when the replacement or extension of underground extra-high voltage cables is required and the operator cuts the power cable in a manhole or handhole and pulls out the power cable, the concentric neutral power cable is difficult to detect and separates live and oblique lines. There are disadvantages that cannot be judged accurately.

The reason is that the detector reacts by the electrostatic induction phenomenon. The 22.9kV concentric neutral power cable has a concentric neutral wire between the conductor and the sheath, and the concentric neutral wire prevents the static induction phenomenon between the conductor and the sheath. because it plays a role. The concentric neutral wire is connected to the ground wire to serve as a ground.

Since there is no way for a worker to check the vitality of the power cable to be cut, it is time consuming to identify the connection path of the power cable and guess the vitality using the tag attached to each cable during the power cable installation drawing and construction. In many cases, it is difficult to use it because the tags are damaged during the passage of time, the inflow of muddy water in the summer and numerous operations, and many cable lines pass through one manhole, so it is difficult to distinguish which cable is currently working. There are many times when you can't.

In particular, there are cases where workers use an ammeter to check whether the power cable is live, but when the power cable is switched off (when the switch on one side of the power cable is turned off and no current movement occurs, but It is pressurized) Since the pointer of the ammeter points to 0 (zero), accurate judgment is impossible through this. Therefore, even if the information in the drawing is incorrect, or even if the information in the drawing is accurate, a number of power cables are mixed, so a worker or supervisor may misunderstand the information in the drawing and cut the live wire. In addition to being injured, industrial damage can occur due to power outages.

Republic of Korea Patent Registration No. 10-0591874 (2006.06.14.)

An object of the present invention has been made to solve the above problems, and when cutting the concentric neutral power cable by mistake, when trying to cut the live concentric neutral power cable, the operation is automatically performed by determining the live state of the concentric neutral power cable. It is to provide a safety cutting machine for life-and-determining power cables that can prevent electrical accidents and power outages by being stopped.

Safety cutter for life and death check power cable according to an embodiment of the present invention for solving the above technical problem, a cutter having a pair of cutting knives for cutting through the concentric neutral power cable; a driving unit supplying a driving force to at least one of the pair of cutting knives; An electrostatic measurement band having an electroscope needle fastened to the outer periphery of the concentric neutral power cable and passing through the concentric neutral layer of the power cable to be disposed in a position in contact with the semiconducting layer or the insulator layer without contacting the concentric neutral layer. ; an electric detector that is electrically connected to the detector needle and determines whether the concentric neutral power cable is in a live state; and a control unit connected to the drive unit and the electricity detection unit to control whether or not the cutting knife performs a cutting operation.

As another embodiment, the electrostatic measurement band of the present invention includes a band body having an opening formed on one side to allow the concentric neutral power cable to enter and exit; Electrodetection needle fixed to one side of the inner circumferential surface of the band body via a support plate; an electric wire electrically connecting the support plate and the detector part inside the band body; a locking jaw portion fixed to one end of the opening with respect to the outer circumferential surface of the band body; and a boa system installed at the other end of the opening with respect to the outer circumferential surface of the band body and pulled to narrow the gap between the openings when connected to the locking jaw.

As another embodiment, the band body of the present invention is characterized in that it is made of a C-shaped elastic body so that the opening is enlarged or reduced.

As another embodiment, the detector needle of the present invention is characterized in that a plurality of detector needles are installed at regular intervals on the inner circumferential surface of the band body.

As another embodiment, the detector needle unit of the present invention is characterized in that it is installed at intervals of 90 degrees from the opening.

As another embodiment, the detector needle of the present invention has a conical shape so that the tip of the detector needle reaches a position where it contacts the semiconducting layer or the insulator layer when the support plate is driven into the outer sheath surface of the concentric neutral power cable. It is characterized in that formed by.

As another embodiment, the boa system of the present invention, the dial installed on the outer circumferential surface of the band body is locked while rotating in the winding direction when pressed, and rotates in the releasing direction when pulled upward; a wire connected to the dial and tightened or loosened according to the rotation direction of the dial; And it is fixed to one side of the wire characterized in that it comprises a hook that is coupled to or separated from the locking jaw.

As another embodiment, the control unit of the present invention, when information determining that the concentric neutral power cable is in a live state through the detector needle is input to the detector unit, receives the information from the detector needle and cuts the power cable by the drive unit. It is characterized in that a control signal is transmitted so that the cutting operation of the knife is stopped.

In the safety cutting machine for life-and-death confirmation power cable of the present invention, when the voltage detection band is fastened to the outer diameter of the concentric neutral power cable, the voltage detection needle installed on the inner circumferential surface of the current detection band penetrates the outer coating layer of the concentric neutral power cable and contacts the semiconductive layer or the insulator layer. When the electric charge detects the induced charge and determines the live wire state, the control unit stops the operation of the driving unit, and the cutting operation of the cutting knife is automatically stopped. Because of the structure of the safety cutter for power cables, when it is necessary to cut and remove the existing concentric neutral power cable for replacement or extension of the concentric neutral power cable, Even if a worker or supervisor misunderstands the information in the drawing and tries to cut the live wire, if the concentric neutral power cable is live, it can prevent the cutting of the concentric neutral power cable in advance, resulting in electrical accidents and power outages. It has the effect of preventing accidents.

1 is a structural cross-sectional view of a conventional concentric neutral power cable.
2 is a connection configuration diagram of an electrostatic measurement band and a cutter according to the present invention.
Figure 3 is a cross-sectional view of the configuration before the electrostatic measurement band according to the present invention is fastened to the concentric neutral power cable.
Figure 4 is a cross-sectional view of the configuration after being fastened to the concentric neutral power cable of the electromagnetism measuring band according to the present invention.

Hereinafter, in order to fully understand the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings 2 to 4. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the examples described in detail below. Therefore, the shapes of elements in the drawings may be exaggerated to emphasize a clearer explanation. It should be noted that in each drawing, the same configuration may be indicated by the same reference numerals. Detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

For reference, with respect to the configuration of the present invention, the same name and the same reference numeral is assigned to the same configuration as the conventional (existing) configuration, and overlapping descriptions are omitted.

The present invention includes a cutter 10 having a pair of cutting knives 10a and 10b for cutting through a concentric neutral power cable 20; a driving unit 30 supplying a driving force to at least one of the pair of cutting knives 10a and 10b; It is fastened to the outer periphery of the concentric neutral power cable 20, passes through the concentric neutral layer 6 of the power cable 20, and forms a semiconducting layer 5 or an insulator layer without contacting the concentric neutral layer 6. (3) an electrostatic measurement band (40) having an electroscope needle part (42) disposed at a position in contact with; an electric detector 50 electrically connected to the detector needle 42 to determine whether the concentric neutral power cable 20 is in a live state; And it is connected to the drive unit 30 and the power detector 50, and when information determined that the concentric neutral power cable 20 is in a live state through the detector needle 42 is input to the power detector 50 , and a control unit 60 that receives information from the power detection unit 50 and transmits a control signal to stop the cutting operation of the cutting knives 10a and 10b by the drive unit 30 .

That is, the cutter 10 is provided with a pair of cutting knives 10a and 10b facing each other up and down, and the pair of cutting knives 10a and 10b are rotated at a certain angle by the hinge bolt 12. It is supported by the support frame 14 so as to be rotated, and the driving unit 30 is coupled to the rear side of the support frame 14 .

The driving unit 30 is composed of a hydraulic cylinder, and the hydraulic cylinder includes a front oil supply pipe 32 connected to one front side of the driving unit 30 and a rear oil supply pipe 34 connected to one rear side of the driving unit 30. ) serves to provide a pressing force capable of cutting the concentric neutral power cable 20 by operating the cutting knives 10a and 10b by a mutual hydraulic action in which hydraulic pressure is supplied or discharged.

Here, in the concentric neutral power cable 20, the concentric neutral layer 6 functions as a ground wire to prevent static electricity induction, so the state of the oblique and live wires can be accurately determined from the outside or in a state in contact with the concentric neutral layer 6 can't

The electrostatic measurement band 40 includes a band body 41 having an opening 41a formed on one side to allow the concentric neutral power cable 20 to enter and exit; Electrodetection needle 42 fixed to one side of the inner circumferential surface of the band body 41 via a support plate 43; An electric wire 44 electrically connecting the support plate 43 and the current detector 50 inside the band body 41; A locking jaw portion 45 fixed to one end of the opening 41a with respect to the outer circumferential surface of the band body 41; And a boa system 46 installed at the other end of the opening 41a on the outer circumferential surface of the band body 41 and pulling so that the gap between the openings 41a is narrowed when connected to the locking jaw 45. .

At this time, the band body 41 is preferably made of a C-shaped elastic body so that the opening 41a is enlarged or reduced.

A plurality of the detector needles 42 are installed at regular intervals on the inner circumferential surface of the band body 41, and it is preferable that they are installed at intervals of 90 degrees from the opening 41a.

When the detector needle 42 is driven until the support plate 43 adheres to the surface of the sheath 8 of the concentric neutral power cable 20, the tip of the detector needle 42 is attached to the semiconducting layer 5 or It is preferably formed in a conical shape so as to reach a position in contact with the insulator layer 3.

The boa system 46 includes a dial 46a installed on the outer circumferential surface of the band body 41, locked while rotating in a winding direction when pressed, and rotated in a releasing direction when pulled upward; a wire 46b connected to the dial 46a and tightened or loosened according to the rotation direction of the dial 46a; and a hooking part 46c fixed to one side of the wire 46b and coupled to or separated from the hooking jaw part 45 .

The detector unit 50 has the same principle as a known detector, and detects that electric charge is induced in the detector needle 42 of the detector band 40 according to the phenomenon of static electricity induction and detects the electric charge of the concentric neutral power cable 20. Determine whether there is a live line or a diagonal line.

The control unit 60 is electrically connected to the driving unit 30 and the power detection unit 50.

That is, the control unit 60 controls the operation of the device through a switch. When the power is turned on, the control unit 60 provides a drive signal to the drive unit 30 to cut the pair of knives ( 10a) (10b) starts the operation of cutting the concentric neutral power cable 20.

At this time, the control unit 60 is electrically connected to the drive unit 30 and the power detector 50, and detects whether or not the live wire is live by the power detector 50 and cuts the concentric neutral power cable 20 by the drive unit 30. If a signal for detecting the concentric neutral power cable 20 as a live wire is input by the detector 50 that receives the measured value by the detector needle 42 of the detector measurement band 40, , serves to provide a control signal to immediately stop the driving unit 30 to the driving unit 30.

In addition, if a signal for detecting the concentric neutral power cable 20 as a live wire is not input by the voltage detector 50, the pair of cutting knives 10a and 10b continue to operate, and the concentric neutral power cable 20 is cut, and when the power is turned off by the control unit 60, the driving unit 30 reversely drives the pair of cutting knives 10a and 10b to return them to their initial positions.

At this time, the controller 60 is configured to have a display such as a buzzer, an LED, or a display so that an operator can know whether the live wire state of the concentric neutral power cable 20 is detected.

As such, in the present invention, when the voltage detection band 40 is fastened to the outer diameter of the concentric neutral power cable, the voltage detection needle 42 installed on the inner circumferential surface of the voltage detection band 40 penetrates the outer skin layer of the concentric neutral power cable 20. It reaches the position where it contacts the semiconducting layer 5 or the insulator layer 3, and charges are induced in the detector needle 42 by the electrostatic induction phenomenon. Concentric neutral power cable ( 20), when it is necessary to cut and remove the previously installed concentric neutral power cable 20 for replacement or extension, the information in the drawing is incorrect, or the worker or supervisor misunderstands the information in the drawing Even when trying to cut the concentric neutral power cable 20, if the concentric neutral power cable 20 is live, it can be blocked in advance so that the concentric neutral power cable 20 cannot be cut, so electrical accidents and blackouts that can prevent accidents.

On the other hand, the present invention is not limited to the above-described embodiments, but can be practiced with modifications and variations within the scope of the present invention, and the technical idea to which such modifications and variations are applied also falls within the scope of the following claims. Must see.

3: insulator layer 5: semiconducting layer
6: concentric neutral layer 8: outer skin layer
10: cutting machine 10a, 10b: cutting knife
12: hinge bolt 14: support frame
20: concentric neutral power cable 30: driving unit
32: front oil supply pipe 34: rear oil supply pipe
40: electrostatic measurement band 41: band body
41a: opening 42: detector needle
43: support plate 44: wire
45: locking jaw 46: boa system
46a: dial 46b: wire
46c: hook part 50: electrocution part
60: control unit

Claims (8)

A cutter equipped with a pair of cutting knives for cutting through the concentric neutral power cable;
a driving unit supplying a driving force to at least one of the pair of cutting knives;
An electrostatic measurement band having an electroscope needle fastened to the outer periphery of the concentric neutral power cable and passing through the concentric neutral layer of the power cable to be disposed in a position in contact with the semiconducting layer or the insulator layer without contacting the concentric neutral layer. ;
an electric detector that is electrically connected to the detector needle and determines whether the concentric neutral power cable is in a live state; and
A safety cutting machine for a life and death checking power cable, characterized in that it includes a control unit connected to the driving unit and the electric detection unit to control whether the cutting knife operates or not. The method of claim 1,
The electrostatic measurement band,
a band body having an opening formed on one side to allow the concentric neutral power cable to enter and exit;
Electrodetection needle fixed to one side of the inner circumferential surface of the band body via a support plate;
an electric wire electrically connecting the support plate and the detector part inside the band body;
a locking jaw portion fixed to one end of the opening with respect to the outer circumferential surface of the band body; and
Safety cutter for life and death checking power cable, characterized in that it comprises a boa system installed at the other end of the opening on the outer circumferential surface of the band body and pulling so that the gap between the openings is narrowed when connected to the locking jaw. The method of claim 2,
The band body is a safety cutter for a life and death check power cable, characterized in that made of a C-shaped elastic body so that the opening is enlarged or reduced. The method of claim 2,
The safety cutter for life and death checking power cables, characterized in that a plurality of the detector needles are installed at regular intervals on the inner circumferential surface of the band body. The method of claim 4,
The electric detector needle is a safety cutter for life and death check power cables, characterized in that installed at intervals of 90 degrees from the opening. The method of claim 2,
The detector needle is formed in a conical shape so that the tip of the detector needle reaches a position where it contacts the semiconducting layer or the insulator layer when the support plate is driven until it is in close contact with the surface of the outer skin layer of the concentric neutral power cable. Safety cutter for power cables. The method of claim 2,
The BoA system,
a dial installed on an outer circumferential surface of the band body, locked while rotating in a winding direction when pressed, and rotated in a releasing direction when pulled upward;
a wire connected to the dial and tightened or loosened according to the rotation direction of the dial; and
Safety cutter for life and death checking power cable, characterized in that it comprises a hook that is fixed to one side of the wire and coupled to or separated from the locking jaw. The method of claim 1,
The control unit receives information from the power detection unit and controls the drive unit to stop the cutting operation of the cutting knife when information determining that the concentric neutral power cable is in a live state is input to the power detection unit through the detection needle. A safety cutter for life and death checking power cables, characterized in that for transmitting a signal.

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