KR102598787B1 - Uninterruptible power distribution work method for low voltage line - Google Patents

Abstract

The present invention relates to a low-voltage line uninterrupted power distribution construction method. In order to perform low-voltage line uninterrupted power distribution work, the present invention includes the first step of installing a branch device and a detection device at a predetermined location; A second step of connecting a lead wire between a transformer of a mobile transformer train and a branch device connected to the transformer, and connecting a low-voltage cable between the branch device and a check-off device; When the lead wire connection and the low-voltage cable are completed, a third step of performing the inspection and then turning on the circuit breaker of the inspection circuit breaker; When the breaker of the detection device is turned on, the fourth step is to separate the electric pole side transformer and low-voltage wire, and perform the main work of low-voltage line uninterruptible distribution work, including transformer replacement and wire replacement; And when the main work is completed, a fifth step of reconnecting the electric pole side transformer and the low-voltage wire and opening the breaker of the fuse detector device.

Description

{UNINTERRUPTIBLE POWER DISTRIBUTION WORK METHOD FOR LOW VOLTAGE LINE}

The present invention relates to a low-voltage line uninterruptible distribution construction method, and more specifically, to a low-voltage line uninterruptible distribution construction method that allows uninterrupted distribution construction for low-voltage lines to be performed more efficiently and safely.

Recently, as the public's demand for electricity quality has increased, uninterrupted distribution work is mainly being carried out to ensure power supply without power outage during distribution line maintenance work such as relocation of designated poles or renovation work.

Here, one of the above-mentioned uninterruptible distribution works is the special high-voltage bypass cable method, which constructs a bypass line in the work section using a special high-voltage bypass cable and a construction switch, and puts the work section into a blackout state to carry out the construction. There is a wire transfer method that constructs a bypass line using special high-voltage overhead wires rather than cables, and transfers poles or wires while the work section is live.

However, since the wire rewiring method requires work to be performed while the work section is live, there are difficulties in ensuring the safety of workers, including the possibility of electric shock accidents. Currently, uninterrupted power distribution work is mainly carried out using the special high-voltage bypass cable method. .

For low-voltage line uninterruptible distribution work (e.g., terminal switch pole or branch line uninterruptible work, etc.) among the above-mentioned special high-voltage bypass cable methods, as shown in FIG. 1, a construction switch (G) was used centered on the special high-voltage line. ), a special high-voltage bypass cable car, and a mobile transformer train were configured as a single low-voltage line uninterruptible power distribution equipment to carry out distribution work.

Referring to Figure 1, the existing low-voltage line uninterruptible distribution work procedure involves configuring an extra-high voltage bypass line using a bypass cable and cable junction box, applying power to a construction switch, then separating the live wire jumper, and performing a transformer operation. The installation pole uses a mobile transformer train to supply low-voltage power, and construction is carried out by making the work section diagonal. In FIG. 1, the low-voltage standing cable is a cable that connects a trunk cable (or trunk cable) to a low-voltage line subject to uninterrupted work. The trunk cable (or trunk cable) is a cable installed to supply power to an overhead low-voltage line subject to uninterrupted supply.

However, in order to perform uninterrupted power distribution work using the above-described conventional low-voltage line uninterruptible power distribution equipment, a bypass line must be built from the electric pole to the mobile transformer train using a special high-voltage bypass cable, and there are many components, so the work site for distribution work is limited. There were difficulties in distribution work in narrow areas or areas with heavy traffic. In addition, due to the nature of the special high-voltage bypass cable used at this time, there was a high possibility of secondary accidents (e.g., electric shock, power outage) occurring.

Therefore, there is a need for a method to perform uninterrupted power distribution work for low-voltage lines more efficiently and safely.

The background technology of the present invention is disclosed in Republic of Korea Patent No. 10-0138717 (registered on February 20, 1998, bypass live wire work method using insulated cable).

According to one aspect of the present invention, the present invention was created to solve the above problems, and provides a low-voltage line uninterruptible power distribution construction method that allows uninterrupted power distribution work for low-voltage lines to be performed more efficiently and safely. It has a purpose.

The low-voltage line uninterruptible power distribution construction method according to one aspect of the present invention includes a first step of installing a branch device and a detection device at a predetermined location in order to perform low-voltage line uninterrupted power distribution work; A second step of connecting a lead wire between a transformer of a mobile transformer train and a branch device connected to the transformer, and connecting a low-voltage cable between the branch device and a check-off device; When the lead wire connection and the low-voltage cable are completed, a third step of performing the inspection and then turning on the circuit breaker of the inspection circuit breaker; When the breaker of the detection device is turned on, the fourth step is to separate the electric pole side transformer and low-voltage wire, and perform the main work of low-voltage line uninterruptible distribution work, including transformer replacement and wire replacement; And when the main work is completed, a fifth step of reconnecting the electric pole side transformer and the low-voltage wire and opening the breaker of the fuse detector device.

In the present invention, the low-voltage cable is connected through a movable cable drum device, and the movable cable drum device is moved while placed on a cart that fixes both sides of the axis of the drum device main body for winding or unwinding the low-voltage cable. It includes a cart for moving or fixing, and the cart is equipped with wheels for movement at the bottom, and has two areas for winding the low-voltage cable so that both ends of the cable start and end points can be utilized while only part of the low-voltage cable is unwound. A separation membrane is formed to divide the drum device, and a handle that can rotate the drum device body to unwind or rewind the low-voltage cable is formed on one side of the drum device body.

In the present invention, the branching device is a portable low-voltage cable branching device that can be connected to two terminals for each phase of a mobile transformer train, is stored in a case with a portable handle, is provided with a ground terminal, and has a one-touch connection. Using this possible connecting material, the low-voltage cable is formed in a form that is easy to connect and disconnect, and is formed into three circuits to allow the low-voltage cable to be branched from the branch line. Additionally, the inlet and outlet portions of the low-voltage cable are in a spiral shape by rotating the lead wire once. It is formed to enable connection and disconnection in a one-touch method, and is characterized by a function to prevent loosening due to twisting of the low-voltage cable.

In the present invention, the detector is a portable low-voltage cut-off device equipped with a breaker and a low-voltage detector function to supply or cut off low-voltage power after correcting the phase in case of phase mismatch, and has a handle for carrying. It is formed so that it can be stored in a provided enclosure, and the detection function allows checking whether there is a phase mismatch when voltage is applied to the cable on the power side and the attachment side when the circuit breaker is open. To this end, the detector-related information is displayed on the detector display panel outside the enclosure. As a result, the detection indication, phase loss indication, live wire indication, and phase selection indication are displayed using lamps. Also, when connected to the connection terminal of the low-voltage cable, it is formed to enable connection and disconnection in one turn, and prevents loosening due to twisting of the low-voltage cable. It is characterized by having a function.

According to one aspect of the present invention, the present invention enables uninterrupted power distribution work for low-voltage lines to be performed more efficiently and safely.

Figure 1 is an example diagram shown to explain a conventional special high-voltage bypass cable method.
Figure 2 is a photographic example showing the components required to implement the low-voltage line uninterruptible distribution construction method according to the present invention.
Figure 3 is an example flowchart illustrating a low-voltage line uninterruptible distribution construction method according to an embodiment of the present invention.
Figure 4 is an example diagram showing the difference between the low-voltage line uninterruptible distribution construction method according to an embodiment of the present invention and the conventional uninterruptible distribution construction method.

Hereinafter, an embodiment of the low-voltage line uninterruptible distribution construction method according to the present invention will be described with reference to the attached drawings.

In this process, the thickness of lines or sizes of components shown in the drawing may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

Figure 2 is a photographic illustration of the components necessary for the implementation of the low-voltage line uninterruptible distribution construction method according to the present invention, and is a movable low-voltage cable drum device (hereinafter simply referred to as a movable cable drum device) as shown in (A). (can be done) (100), a portable low-voltage cable branching device (hereinafter, simply referred to as a branching device) that can be connected to two terminals of a mobile transformer, such as (B) (200), (C) A portable low-voltage circuit breaker with a detection function (hereinafter, may simply be referred to as a detection circuit breaker or a blocking device) 300, and a transformer-connection box (or low-voltage cable branch device) as in (D), and a connection box ( Or a low-voltage cable branch device) - includes a lead wire (hereinafter, simply referred to as a lead wire) 400 that can be connected in a one-touch manner between low-voltage standing columns.

The movable low-voltage cable drum device 100 winds low-voltage cables, moves and stores them, and performs the function of installing and removing construction cables during work.

For reference, the conventional cable drum device is a fixed type, so it is difficult to move, and there is a problem that the entire cable wound around the drum device must be unwound in order to utilize the cable.

However, the movable low-voltage cable drum device (A) according to this embodiment can be easily moved in the field, can be connected to power by unwinding only the required length, and has the characteristics of being easy to rewind.

As shown in (a) to (c) of Figure 2 (A), the movable low-voltage cable drum device 100 includes a frame (or cart) that secures both sides of the axis of the drum device main body (cable winding device). ) is equipped with a small wheel at the bottom of the drum device, allowing movement even when the drum device is raised and fixed, and the cable can be unwound or wound by rotating the drum device in a stationary state.

In addition, as shown in (d) of Figure 2 (A), when winding the cable, the start and end points are separated and formed into a shape that can be wound, and a cable separator (cable separator) that can be used even without unwinding the entire cable. ) and a handle (to facilitate rewinding of the low-voltage cable after construction is completed). ) is formed. Areas where explanations are omitted ( ) refers to a pre-defined area where the starting point (or end point) of the cable can be wound.

The portable low-voltage cable branch device 200, which can be connected to two terminals (e.g., low-voltage distribution box terminals) for each phase of the mobile transformer train, is used to connect the trunk cable (i.e., uninterrupted supply target processing) from the low-voltage distribution box (not shown) of the mobile transformer train. It functions as a connection device and branch device that supplies low-voltage power to branch cables (cables installed to supply power to low-voltage lines), trunk cables, or branch cables from the trunk cable.

For reference, the conventional cable branch device (not shown) connects the cable to a booth connection device (not shown) made of copper (e.g., compressing the cable to the connection terminal, attaching it to the connection groove, and tightening it with a hex wrench). , It is a device mainly used for underground lines, but it is formed without a cover device and is exposed to the ground, so there is a problem with its use. The current supply capacity of the mobile transformer is 300kVA, and the secondary terminals are composed of two for each phase (2 R terminals/2 S terminals/2 T terminals/2 N terminals).

Accordingly, the portable low-voltage cable branch device 200, which can be connected to two terminals for each phase of the mobile transformer train, is a portable box (or enclosure), as shown in (a) and (b) of FIG. 2 (B). It is formed so that it can be stored safely and moved without being exposed to the outside, and is equipped with a grounding terminal (not shown) to improve safety and eliminate restrictions on installation location, and the cable connection is connected using a connecting material that allows one-touch connection. It is formed in a form that is easy to separate.

Referring to (a) and (b) of Figure 2 (B), the portable low-voltage cable branch device 200 that can be connected to the two terminals of the mobile transformer train is installed in the low-voltage distribution box (not shown) of the mobile transformer train. Two cables can be connected, and three circuits are formed to allow branching of low-voltage cables from branch lines. In addition, a contact point is formed in the form of a booth made of copper material, and the cable input and output portion is formed in a spiral shape to form a contact point for one-touch connection by rotating the lead wire once, and is equipped with a function to prevent cable loosening due to cable twisting, and has at least 70 to 185 degrees Celsius. It is formed in a size that allows the use of ㎟ standard cables. In addition, the enclosure is equipped with a ground terminal to improve safety, and a handle (not shown) is formed to make it easy to carry and move.

The portable low-voltage circuit breaker 300 with the detection function branches off from the trunk cable and matches the phases between the lines when supplying low-voltage power, thereby performing the function of connecting and disconnecting low-voltage lines to ensure worker safety and line safety. In addition, the portable low-voltage circuit breaker 300 equipped with the detection function includes an detection unit (not shown) capable of measuring phases (i.e., three phases) when branching from the main line and connecting to a low-voltage line, and is made of stainless steel. It is stored in a box and is shaped for easy movement and installation.

For reference, conventional low-voltage circuit breakers do not include a detection function, and are used in a form attached to a low-voltage distribution box (i.e., they are not movable).

However, the portable low-voltage circuit breaker 300 with the detection function according to this embodiment is equipped with a power-load detection function in the low-voltage breaker so that the low-voltage power can be supplied or cut off after correcting the phase in case of phase mismatch. It is a blocking device with functions.

More specifically, in the portable low-voltage circuit breaker 300 equipped with the above detection function, the low-voltage blocking function (MCCB function) is a switch and trip device integrated into an insulating container, and the electric circuit in the energized state is operated manually or electrically. It can be opened and closed by , and is a function that automatically cuts off the current in abnormal conditions such as overload and short circuit. In this embodiment, it ensures the safety of workers by blocking failures such as overload or short circuit that occur on the low-pressure side during work. This is a function for Alternatively, the detection function is a function to prevent accidents on the system that may occur due to phase difference by checking in advance whether the phases of the power side (mobile transformer train) and the load side (low-voltage line side for uninterrupted work) match. The detection function is operated by a power battery (not shown) built into the housing.

In addition, as shown in (a) of Figure 2 (C), the cable outlet and enclosure form include a handle (not shown) for easy portability and installation, and are composed of two circuits between the power source and the load.

In addition, as shown in (b) of Figure 2 (C), on the outside of the box, information related to the detector (e.g., phase loss display, phase loss display, live line display, phase selection display, etc.) is displayed as visual information (e.g., LED lamp). It is implemented so that it can be displayed. In other words, the detection function displays a lamp on the detector display panel that allows you to check whether there is a phase mismatch when voltage is applied to the cable on the power load side with the circuit breaker open.

Here, the inspection display is display information indicating the status of inspection, and the lamp on the subject of inspection lights up. When the phase loss display occurs due to incomplete connection during inspection, the lamp of the phase in which the phase is lost lights up. The live line indication is display information indicating whether each phase (R, S, T) of the mobile transformer train and each phase (u, v, w) on the low-voltage line side are in a live state, and lights up only on the phase that is in a live state.

At this time, when performing inspection, lift the power switch at the bottom right of the display board to connect the operating power. If the operating power is connected while the power side of the circuit breaker and the load side are not connected to the mobile transformer train or low-voltage line, the display board will be displayed. 'Phase selection', 'false loss indication', 'phase loss indication', and 'live line indication' all light up and the alarm sound continues to sound due to phase loss.

The lead wire 400, which allows one-touch connection between the transformer (mobile transformer) - connection box (or low-voltage cable branch device), and connection box (or low-voltage cable branch device) - low-voltage riser, is shown in Figure 2 (D). As shown in (a) and (b), the starting point of the lead wire between the transformer (mobile transformer) and the connection box (or low-voltage cable branch) is a rotary terminal so that it can be connected to the low-voltage distribution box (not shown) of the mobile transformer. It is formed including a connection terminal that can be connected to a cable connection device at the end point. In addition, the starting point of the lead wire between the junction box (or low-voltage cable branch) and the low-voltage stand includes a rotary terminal that can be connected to the cable connection device, and the end point includes a wire-hanging connection terminal that can be connected to an overhead wire. It is formed by

At this time, the connection terminal that can be connected to the cable connection device is formed in a one-touch form that can form a contact point by turning the cable once to facilitate connection and separation, and includes a function to prevent cable loosening due to torsional load.

In addition, the lead wire between the transformer (mobile transformer) and the connection box (or low-voltage cable branch) is at least 8 strands so that the number of low-voltage trunk lines can be varied (e.g., 1 to 2 lines) in the mobile transformer depending on the load side capacity. It is provided with a lead wire, and the lead wire is tapped with a specific color (e.g. red, blue, white, green, etc.) designated at the start and end points for phase distinction.

Above, a method for performing uninterrupted power distribution work on low-voltage lines using the above components (A, B, C, and D) will be described.

Figure 3 is an example flowchart for explaining a low-voltage line uninterruptible distribution construction method according to an embodiment of the present invention.

As shown in FIG. 3, in order to perform uninterrupted power distribution work on low-voltage lines, the above-described branching device 200 and blocking device 300 (or detection blocking device) are installed at a predetermined location (S101).

And the lead wire between the transformer of the mobile transformer (i.e. mobile transformer) and the device connected to this transformer (e.g. branch device) and the cable (i.e. low voltage cable) between each device (e.g. branch device, detector, etc.). Install (connect) (S102).

When the connection of the lead wire and cable (i.e., low-voltage cable) is completed as described above, the circuit breaker (i.e., detection device) 300 is turned on after inspection (S103).

When the circuit breaker (i.e., detection device) 300 is turned on as described above, the electric pole side transformer (not shown) and the low-voltage wire (not shown) are separated (S104), and the main work (e.g., transformer replacement and wire replacement, etc.) is turned on. ) is performed (S105).

Accordingly, when the main work is completed, the electric pole-side transformer (not shown) and the low-voltage wire (not shown) are reconnected (S106), and the circuit breaker (i.e., breaker) 300 is opened (S107).

As described above, the low-voltage line uninterruptible distribution construction method according to this embodiment can simplify the existing complex work process that requires a large number of equipment, thereby improving work efficiency and improving worker safety, and management accordingly. Economic effects can be achieved by reducing costs.

Figure 4 is an exemplary diagram shown to compare the differences between the low-voltage line uninterruptible distribution construction method according to an embodiment of the present invention and the conventional uninterruptible distribution construction method.

Figure 4 (A) is an example diagram showing the uninterruptible construction of a terminal switch pole (i.e., a utility pole on which a transformer is installed) to compare the conventional method (a) and the method (b) according to this embodiment, and is shown here. As described above, the conventional method (a) carries out construction using a construction switch (G), a special high-voltage bypass cable car (SC), and an uninterruptible transformer train (UC) (or a mobile transformer train). Therefore, work processes must be performed to connect the above devices (e.g., construction switch (G), extra high-voltage bypass cable car (SC), and uninterruptible transformer train (UC)).

However, the construction method (b) according to this embodiment carries out construction using an uninterruptible transformer train (UC) (or mobile transformer train) and a low-voltage cable drum device (A) (not shown) connected to it. As a result, the work process can be simplified by reducing the number of devices (e.g., construction switch (G), special high-voltage bypass cable car (SC), etc.).

Figure 4 (B) is an example diagram showing the uninterruptible construction for three single-phase transformers to compare the conventional method (a) and the method (b) according to this embodiment. As shown here, the conventional method ( a) uses a construction switch (G), a special high-voltage bypass cable car (SC), three uninterruptible transformer trains (UC) (or mobile transformer trains), and two branch devices (or branch connection devices) (DU). Carry out construction. Therefore, a work process is carried out to connect the above devices (e.g. construction switch (G), extra high voltage bypass cable car (SC), uninterruptible transformer train (UC) × 3 units, branch unit (DU) × 3 units) Should be.

However, the construction method (b) according to this embodiment carries out construction using an uninterruptible transformer train (UC) (or mobile transformer train) and a low-voltage cable drum device (A) (not shown) connected to it. Accordingly, the work process can be simplified by reducing the number of devices (e.g. construction switch (G), extra high voltage bypass cable car (SC), uninterruptible transformer (UC) × 2 units, branch unit (DU) × 3 units, etc.) It becomes possible.

Figure 4 (C) is an example diagram showing the comparison between the conventional method (a) and the method (b) according to this embodiment for uninterrupted construction on branch lines with a total capacity of less than 300 kVA. As shown, the conventional method (b) is Method (a) includes a construction switch (G), a special high-voltage bypass cable car (SC), two uninterruptible transformer trains (UC) (or mobile transformer trains), and one branch device (or branch connection device) (DU). Construction is carried out using . Therefore, the work process to connect the above devices (e.g. construction switch (G), extra high voltage bypass cable car (SC), uninterruptible transformer train (UC) × 2 units, branch unit (DU) × 1 unit) is carried out. Should be.

However, the construction method (b) according to this embodiment carries out construction using an uninterruptible transformer train (UC) (or mobile transformer train) and a low-voltage cable drum device (A) (not shown) connected to it. As a result, the work process can be simplified by reducing the number of devices (e.g. construction switch (G), extra high voltage bypass cable car (SC), uninterruptible transformer train (UC) × branch unit (DU) × 1 unit, etc.) .

Figure 4 (D) is an example diagram showing uninterruptible construction using an existing transformer (when there is room in supply capacity) to compare the conventional method (a) and the method (b) according to this embodiment. As shown, the conventional method (a) carries out construction using one uninterruptible transformer train (UC) (or mobile transformer train). Therefore, management costs and personnel must be invested to use the above device (uninterruptible transformer (UC) × 1 unit).

However, the construction method (b) according to this embodiment can be performed using a low-voltage cable drum device (A) (not shown), thereby simplifying the work process and reducing management costs.

As described above, this embodiment includes components developed to implement the low-voltage line uninterruptible distribution construction method (e.g., mobile cable drum device 100, portable low-voltage cable branch device 200, detection device 300, lead wire). By using (400)), uninterrupted distribution work for low-voltage lines can be performed more efficiently and safely.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and various modifications and equivalent embodiments can be made by those skilled in the art. You will understand the point. Therefore, the scope of technical protection of the present invention should be determined by the scope of the patent claims below.

100: Mobile cable drum device
200: Portable low-voltage cable branching device
300: Detection blocking device
400: lead wire

Claims (1)

In order to perform uninterrupted power distribution work on low-voltage lines, a first step of installing a branch device and a detection device at a predetermined location;
A second step of connecting a lead wire between a transformer of a mobile transformer train and a branch device connected to the transformer, and connecting a low-voltage cable between the branch device and a check-off device;
When the lead wire connection and the low-voltage cable are completed, a third step of performing the inspection and then turning on the circuit breaker of the inspection circuit breaker;
When the breaker of the detection device is turned on, the fourth step is to separate the electric pole side transformer and low-voltage wire, and perform the main work of low-voltage line uninterruptible distribution work, including transformer replacement and wire replacement; and
When the main work is completed, a fifth step of reconnecting the electric pole side transformer and the low-voltage wire and opening the circuit breaker of the fuse detector device,
The detection blocking device is,
It is a portable low-voltage cutoff device equipped with a circuit breaker and low-voltage detection function to supply or cut off low-voltage power after correcting the phase in case of phase mismatch.
The above detection function allows you to check whether there is a phase mismatch when voltage is applied to the cable on the power side and the attachment side when the circuit breaker is open. For this purpose, information related to the detector is displayed on the detector display board outside the enclosure, such as detection indication, phase loss indication, live wire indication, and phase selection indication using lamps,
The image detection display is display information indicating the status of the image image, and the lamp of the image subject to inspection lights up. The image loss display indicates that if an image loss occurs due to an incomplete connection during the inspection, the lamp of the image image forming phase lights up, and the live line display is This is display information indicating whether each phase (R, S, T) of the mobile transformer train and each phase (u, v, w) on the low-voltage line side are live, and the lamp lights only on the phase that is live.
When performing inspection, the power switch at the bottom right of the display board is turned up to connect the operating power source. If the operating power source is connected when the power source side of the circuit breaker and the load side are not connected to the mobile transformer train or low-voltage line, the display panel The lamps for 'phase selection', 'false loss display', 'phase loss display', and 'live line display' are all turned on and an alarm sound continues to sound due to phase loss.
The branching device is,
It is a portable low-voltage cable branching device that can be connected to two terminals for each phase of a mobile transformer train.
It is formed to be stored in a case with a portable handle,
Equipped with a ground terminal,
It is formed in a form that makes it easy to connect and disconnect low-voltage cables using a connector that allows one-touch connection.
It is formed into three circuits to enable branching of low-voltage cables from branch lines.
In addition, the input and output portion of the low-voltage cable is formed in a spiral shape so that it can be connected and disconnected with one touch by turning the lead wire once, and has a function to prevent loosening due to twisting of the low-voltage cable.
The detection blocking device is,
It is formed so that it can be stored in a case with a handle for carrying,
In addition, a low-voltage line uninterruptible distribution construction method is formed so that it can be connected and disconnected in one rotation when connected to the connection terminal of the low-voltage cable, and has a function to prevent loosening due to twisting of the low-voltage cable.

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