KR100769583B1 - Ground Transformer Replacement Method for Underground Distribution Lines by Uninterruptible Construction Method - Google Patents

Abstract

The present invention discloses a method for replacing a ground transformer in an underground distribution line by an uninterruptible construction method.

The present invention is a method of connecting a power supply to a mobile transformer vehicle in a live state using a cable break (load break) application method or bypass cable application method while continuously supplying power to consumers such as homes, offices, factories, ground transformers The present invention provides a method of replacing a ground transformer in an underground distribution line by an uninterruptible construction method.

In order to achieve the above object, in the process of replacing a transformer on an underground distribution line, when the conventional method is applied, a temporary power failure is inevitable, and so many consumers, such as homes and businesses, have to bear inconvenience or economic loss. However, the present invention is the inconvenience or economic loss of the consumer, such as a number of homes and businesses that are powered by the underground distribution line by replacing the transformer on the underground distribution line uninterrupted by using the cable junction application method or bypass cable application method There is a feature that can prevent the occurrence of.

Description

Uninterruptible hpower replacing method of transfermer for underground power distrbution line}

1 is a schematic view showing the operation of replacing the ground transformer by the uninterruptible method using the cable junction method of the first embodiment of the present invention.

2 to 4 is a flowchart showing a process of replacing the ground transformer by the uninterrupted method using the cable junction method of the first embodiment of the present invention.

Figure 5 is a schematic view showing the operation of replacing the ground transformer in the uninterruptible method using the bypass cable method of the second embodiment of the present invention.

6 to 8 is a flowchart illustrating a process of replacing the ground transformer by the uninterruptible method using the bypass cable method of the second embodiment of the present invention.

** Explanation of symbols for main parts of drawings **

1: cable junction 2: mobile transformer car

3: customer 4: bypass cable

The present invention relates to an uninterruptible replacement method of a ground transformer in an underground distribution line, and more specifically, to connect a power supply to a mobile transformer vehicle in a live state by applying a cable break application method or a bypass cable application method. The present invention relates to a method of replacing a ground transformer in an underground distribution line by an uninterruptible method to replace ground transformers while continuously supplying power to customers such as homes, offices, and factories.

In general underground power distribution lines, the voltage is dropped to supply a low voltage of 220/380 V suitable for various home and industrial equipments at a special high voltage of 22.9 KV supplied through power transmission lines from a power plant when power is supplied to homes or industrial facilities. Transformers are used as a means.

If the transformer is damaged due to aging or overload, it should be replaced with a transformer that operates normally. When replacing the transformer of the ground distribution line, it is made by an uninterruptible transformer using an uninterruptible transformer replacement vehicle or a switchgear. All transformers between the switch and the switch are blacked out and replaced with a transformer that normally operates.

Among them, the method of working after power failure of all transformers without using an uninterruptible transformer replacement vehicle will inevitably cause a power failure of large apartment complexes or spaces when performing work, which may cause considerable inconvenience to certain homes or businesses, and economic loss. Triggered.

The present invention is unlike the conventional method of applying the cable junction, unlike the conventional method in which a large number of households or businesses accept the inconvenience or economic loss by performing a temporary blackout when replacing a transformer on a conventional underground distribution line. By applying the bypass cable application method, the transformer on the underground distribution line can be replaced with an uninterruptible power to prevent the inconvenience or economic loss of customers such as a large number of homes and businesses that are powered by the underground distribution line. There is this.

The ground transformer replacement method of the underground distribution line by the uninterrupted method using the cable junction method which is the first embodiment of the present invention for achieving the above object,

A first step of determining whether to apply the uninterruptible method by checking the fixation state of the ground transformer elbow connection member (H1A) (H2A) (H3A) (H3A) (H1B) (H2B) (H3B); If the uninterruptible method is applicable, install the junction on the ground transformer to connect the ground transformer and the junction for separation of the primary A circuit, remove the elbows of the elbow connector (H1A) (H2A) (H3A), and then A second step of connecting to the junction; The primary and secondary three phases of the switchgear are put together and the secondary side is separated for each phase and stored in the insulation holder.The insulation plug (SOP) is installed on the ground transformer and the elbow connection material (H1A) (3) removing the elbow (H2A) (H3A) and connecting the elbow to the insulation plug (SOP) and dismantling the ground transformer; After installing the new transformer in the position where the ground transformer is removed in the third step, install an insulation plug (SOP) in the transformer to connect the power to the primary B circuit and remove the elbow of the insulation plug (SOP) and then the elbow connection member ( A fourth step of connecting the elbows of H1B) (H2B) (H3B); And a fifth step of installing the junction in the transformer for connecting the power to the primary side A circuit and disconnecting the elbow of the junction, and then connecting the elbow to the elbow connecting member (H1A) (H2A) (H3A). .

In the present invention, it is preferable that the first step further comprises the step of looping the power of the ground transformer by inputting the contacts of the normally open switch in the power switch of both sides connected to the ground transformer.

In addition, in the present invention, the fixed state of the ground transformer elbow connecting member (H1A) (H2A) (H3A) (H1B) (H2B) (H3B) in the second step is preferably made by a live switch.

In addition, it is preferable to install an elbow on one side of the junction and an insulation cap on the other side in the second step.

In addition, the ground transformer replacement method of the underground distribution line by the uninterrupted method using the bypass cable method of the second embodiment of the present invention,

Connect and install the bypass cable to the switch (S1) (S2) adjacent to the ground transformer to be replaced and check the fixation status of the ground transformer elbow connector (H1A) (H2A) (H3A) (H1B) (H2B) (H3B). A first step of determining whether to apply the uninterruptible construction method; If the uninterruptible method is applicable, the insulation plug (SOP) is installed on the ground transformer to separate the primary A circuit, and the elbow of the elbow connector (H1A) (H2A) (H3A) is removed and the insulation plug (SOP) is removed. Connecting the elbow to the second step; After the above step 2, in order to separate the B circuit of the primary side, install an insulation plug (SOP) in the ground transformer, remove the elbows (H1A) (H2A) (H3A) elbow, and then place the elbow on the insulation plug (SOP). Connecting and dismantling the ground transformer; After installing the new transformer in the position where the ground transformer is removed in the third step, install an insulation plug (SOP) in the transformer to connect the power to the primary B circuit and remove the elbow of the insulation plug (SOP) and then the elbow connection member ( A fourth step of connecting the elbows of H1B) (H2B) (H3B); And a fifth step of installing the junction in the transformer for connecting the power to the primary side A circuit and disconnecting the elbow of the junction, and then connecting the elbow to the elbow connecting member (H1A) (H2A) (H3A). .

In the present invention, it is preferable that the first step further comprises the step of looping the power of the ground transformer by inputting the contacts of the normally open switch in the power switch of both sides connected to the ground transformer.

In addition, in the present invention, the first step is preferably further provided with a step of putting the first, second and third phases of the switchgear and separating the secondary side by phase for each phase to be stored in the insulation holder.

In addition, in the present invention, the fixed state of the ground transformer elbow connecting member (H1A) (H2A) (H3A) (H1B) (H2B) (H3B) in the second step is preferably made by a live switch.

In addition, in the present invention, it is preferable to install an insulating cap after separating the elbow from the elbow connecting member in the second step.

Hereinafter, the present invention will be described in detail.

1 is a schematic view showing the operation of replacing the ground transformer by the uninterruptible method using the cable junction method of the first embodiment of the present invention, the cable junction when uninterrupted to replace the ground transformer (T1) (T2) (T3) (1) Ground transformer located between two switchgear (S1) (S2) while supplying power to customer (3) such as home or business by connecting power to mobile transformer car (2) in live state using construction method ( T1) (T2) (T3) shows the wiring condition for replacing the ground transformer (T2). In addition, a bypass cable car, various cables, or the like may be used.

Hereinafter, a process of replacing the ground transformer by the uninterruptible method of the first embodiment of the present invention using the cable break method will be described in detail with reference to FIGS. 2 to 4.

Before any work, prepare a work plan for the replacement of the ground transformer (T2) (S11), and check the preparation of necessary equipment such as tools, protective equipment, cables, and equipment necessary for this work (S12). Notify the command office of the contents of the work, the place of work, the name of the track and the replacement transformer, the start date and time, the scheduled time of completion, and the name of the person in charge of the operation (S13) while securing a communication network for emergency communication.

Of course, the person in charge of work can install safety signs and compartment indicators that can mark the work area to prevent safety accidents, and use the mobile transformer car (2) or special high and low voltage cables, or work order and work safety management. It is natural to be familiar with the staff.

After the work preparation is completed, the operator opens the front door of the ground transformer T2 and installs an auxiliary rail for installing the switchgear on the ground transformer T2. Of course, separating the front door to the ground transformer (T2) (S20) may be made after installing the mobile transformer car (2). Subsequently, the operator installs the elbow connection member live switch on the ground transformer T2 and attaches a jig for confirming the connection member fixation to the elbow restraint.

Then, operate the elbow connecting member live switch to shake the connecting member left and right to check whether the six elbow connecting members H1A, H2A, H3A, H1B, H2B and H3B are not stuck by grease bonding or conductor melting bonding. It is confirmed (S14).

As a result, if it is determined that the elbow connection member H1A, H2A, H3A, H1B, H2B, and H3B are in a stuck state, the uninterruptible method cannot be implemented. Ground transformer (T2) can be replaced by applying open / close operation after checking the elbow connection material condition.

If the elbow connector (H1A) (H2A) (H3A) (H1B) (H2B) (H3B) is not stuck, check with the commander in advance to confirm the switch contact point, and then connect the power switch on both sides of the transformer (T2). In operation S1 and S2, a switch contact point that is normally open is input to turn the power of the transformer T2 into a loop S15. After completing the looping operation of the line, the mobile transformer car 2 is installed, and the mobile transformer car 2 is installed at an appropriate distance from the replacement transformer so that the operator's action is free (S16). Grounding is to protect people and equipment.

After installing the mobile transformer car 2, the contact point of the switch S1 and S2 is checked (S17), and a special low voltage cable is installed (S18). That is, check the connection state of the switch (S1) (S2) ground terminal and the ground wire, check the presence or absence of breakage or abnormality of the bushing (S1) (S2), and the gas pressure of the switch (S1) (S2), and open the low voltage breaker. Check it. Then, the cable for junction connection is connected to the connection of the van of the mobile transformer car 2, the primary cable is displayed, the connection phase is checked and the connection is made according to the color. At this time, the ground wire of the installed cable is connected to the existing ground (S19).

Finally, the secondary cable lead wire and the secondary side connecting device are connected to the low pressure connection box (S21), and the forceps-type and the rotary fixed connection device are connected in the order of the busbars X1, X2, and X3 of the ground transformer T. In particular, in order to prevent contact between the enclosure and the phase during the connecting operation, the position of the bushing should be well checked for the enclosure and the phase insulation board.

After completing the preparatory work, the worker performs the live wire separation of the ground (replacement) transformer (T2).

First, the operator attaches the left and right coordinate ruler to the top of the ground transformer T2 in preparation for the separation of the primary side A circuit (S22), attaches the coordinate setting probe to position the elbow restraint of the switchgear, and the operation ring of the elbow. Set the coordinates according to the wealth. That is, the operator reads and records the X and Y axis coordinates of the elbow connecting members H1A, H2A, H3A, H1B, H2B, and H3B.

To disconnect the primary A circuit, the operator connects the primary cable to the junction (S23) and connects the break-away device, while installing the ground transformer (T2) junction fixture on the parking stand and connecting the cable to the junction (1). ) To the holder (S24). At this time, the insulating cap may be connected to the other bushing of the junction 1 after the silicone grease is applied.

Then, the operator who installs the junction holder grasps the elbow restraint of the switchgear according to the elbow connection member (H1A) coordinates, presses the open button of the switchgear to disconnect the elbow (S25), and connects the elbow to the junction (1) (S26). )do. At this time, the opening and closing operation switch is to be interlocked separately from other operation buttons. The operator who operates the switch to place the separated elbow at the inlet of the bushing insert of the junction 1 confirms that the operation shaft is matched and presses the input button to make the elbow live (S27).

The above S23 to S27 is also made repeatedly for the elbow connecting member (H2A) (H3A) (S28).

After removing the elbow connecting material (H1A) (H2A) (H3A) elbow through the above process and connecting it to the junction (1), the operator checks that each phase has not changed, and then the switch contacts 1 and 2 of the mobile transformer car (2). The three-phase collective input is carried out to check the abnormality of the switch and the gas pressure, and then the three-phase collective input of the low pressure side contact point of the switch of the mobile transformer car 2 (S29) (S30).

After that, the worker who installed the insulation cradle to keep the secondary terminal in an insulated state on the side of the ground transformer T2 unscrews the busbar's tannery bolt to separate each phase of the secondary side from the ground transformer T2. Separating (S31) and stored in the insulating cradle (S32), wherein the bus bar of the ground transformer (T2) is separated in the order of X1, X2, X3. Of course, the secondary terminal of each phase should be separated to complete the load switching operation.

Next, the worker insulates the primary side B circuit (S33) (S37), which is repeatedly made for the elbow connecting member H1B (H2B) (H3B).

The worker who installed the insulation plug (SOP) in the ground transformer (T2) (S34), the elbow restraint of the switchgear holding the elbow in accordance with the elbow connector (H1B) (H2B) (H3B) coordinates and press the open button of the switchgear to elbow Will be separated live (S36). Then, the operator operates the switchgear so that the separated elbow is positioned at the inlet of the insulation plug (SOP) to confirm that the operation shafts coincide, and presses the input button to make the elbow live (S36), and then the ground transformer (T2), Remove the transformer to be replaced (S38).

Here, to remove the ground transformer T2, the operator adjusts the lower cylinder of the switchgear to separate the ground transformer T2, and then confirms that the primary and secondary cables are sufficiently stable and lifts the ground transformer T2. After handling the terminals that hinder the lifting, dismantle and dismantle the front lower part fixing part of the ground transformer (T2).

After the thorough work of the ground transformer (T2) is completed, the worker installs a new transformer using a crane (S39).

After that, the power of the primary B circuit is connected (S40). For this purpose, the operator sets the primary bushing coordinates for the elbow connector (H1A) (H2A) (H3A) (H1B) (H2B) (H3B) and replaces it. Install an insulation plug (SOP) on the transformer (S41). The elbow restraint of the switchgear is held in line with the elbow of the parking stand, press the open button of the switchgear to release the elbows (S42), and operate the switchgear to the bushing insert inlet of the elbow connector (H1B). The operator who made the position to confirm that the operation axis is matched and press the input button to make the elbow live connection (S43).

The above S41 to S43 are also repeated for the elbow connecting member H2B and H3B (S44).

For each phase-specific connection (S45) on the secondary side, the operator connects the forceps-type and rotary fixed connection devices in the order of busbars X1, X2 and X3 of the replacement transformer. In particular, in order to prevent contact between the enclosure and the phase during the connecting operation, the position of the bushing should be well checked for the enclosure and the phase insulation board.

The operator who opened the three-phase open contactors of the low-voltage side of the switchgear of the mobile transformer car 2 opened the three-phase open-closed switch 2 and the primary-side contact point of the mobile transformer car 2 (S46) (S47) and the presence of abnormality of the switch and the gas. Check the pressure.

The operator connects the power supply of the primary A circuit, sets the primary side bushing coordinates for the elbow connecting member (H1A) (H2A) (H3A), installs the transformer junction holder, and attaches the junction (1) to which the cable is connected (S49). ).

Then, the operator who installs the junction in the transformer grabs the elbow restraint of the switchgear according to the elbow connector (H1A) coordinates, presses the open button of the switchgear to release the elbow (S50) and operates the waste device to separate the elbow. Is located at the bushing insert inlet of the elbow connecting member (H1A) of the junction (1) to confirm that the operation axis is matched and press the input button to make the elbow live connection (S51).

The above S49 to S51 are repeatedly made for the elbow connecting member H2A and H3A (S52).

After completing the replacement of the ground transformer with a new transformer (S53), the worker completes the system normalization (S54) and notifies the command room (S55) of this.

FIG. 5 is a schematic view illustrating a process of replacing a ground transformer by an uninterruptible method using a bypass cable method according to a second embodiment of the present invention. When the ground transformers T1, T2, and T3 are uninterrupted, By using a pass-by cable (4) method to connect the power supply to the mobile transformer car (2) in a live state while supplying power to the customer (3), such as homes or businesses, two switches (S1) ( It shows the wiring state to replace the ground transformer (T1) (T2) (T3) located between S2). In addition, a bypass cable car, various cables, or the like may be used.

Hereinafter, a process of replacing the ground transformer by the uninterruptible method according to the second embodiment of the present invention using the bypass cable method will be described in detail with reference to FIGS. 6 to 8.

Work plan for the replacement of the ground transformer (T2) prior to all work (S101), and check the ready state of the necessary equipment such as tools, protective equipment, cables, equipment, etc. (S102) Notifies the command office of the contents of the work, the place of work, the name of the line and the replacement transformer, the start date and time, the scheduled time of completion, and the name of the person in charge of the operation (S105), while securing a communication network for emergency contact.

Prior to informing the command room of the work preparation situation in this way, the person in charge of the operation checks the field conditions such as load measurement or road situation determination (104), and based on this, determines the personnel allocation and laying method (105).

And the worker connects the bypass cable 4 to the adjacent switchgear S1 (S2), and installs this bypass cable 4 (S106). At this time, the insulation state of the bypass cable 4 or the inspection of the bypass cable 4 and the elbow connection material are also performed.

After notifying the relevant departments of the work preparation completion (S107), the worker installs the elbow connecting member live switch on the ground transformer (T2) and attaches a jig for checking the fixing member attachment to the elbow restraint.

Then, operate the elbow connecting member live switch to shake the connecting member left and right to check whether the six elbow connecting members H1A, H2A, H3A, H1B, H2B and H3B are not stuck by grease bonding or conductor melting bonding. It is confirmed (S108).

As a result, if it is judged that the elbow connection member H1A, H2A, H3A, H1B, H2B, and H3B are stuck, the uninterruptible method cannot be implemented. Replace the ground transformer (T2) by applying a temporary electrostatic method.

If the elbow connector (H1A) (H2A) (H3A) (H1B) (H2B) (H3B) is not stuck, check with the commander in advance to confirm the switch contact point, and then connect the power switch on both sides of the transformer (T2). In operation S1 and S2, a switch contactor that is normally open is input to turn the power of the transformer T2 into a loop S109. After completing the looping operation of the line, the phase of the primary cable is displayed (S111). After that, the operator opens the front door of the ground transformer T2 and installs an auxiliary rail for installing the switchgear on the ground transformer T2. Of course, separating the front door 110 of the ground transformer T2 may be performed after installing the mobile transformer car 2.

Subsequently, the worker installs the mobile transformer car 2, and the mobile transformer car 2 is disposed at an appropriate distance from the replacement transformer so that the worker's action is free (S112). Grounding is to protect people and equipment.

After installing the mobile transformer car 2, the contact point of the switch S1 and S2 is checked, and a special low voltage cable is installed (S113). That is, check the connection state of the switch (S1) (S2) ground terminal and the ground wire, check the presence or absence of breakage or abnormality of the bushing (S1) (S2), and the gas pressure of the switch (S1) (S2), and open the low voltage breaker. Check it. Then, the cable for junction connection is connected to the connection of the van of the mobile transformer car 2, the primary cable is displayed, the connection phase is checked and the connection is made according to the color. In this case, connect the ground wire of the installed cable to the existing ground.

The secondary cable lead wire and the secondary side connecting device are connected to the low voltage connection box (S114), and the clamp type and the fixed rotation type connecting device are connected in the order of the busbars X1, X2, and X3 of the ground transformer T. In particular, in order to prevent contact between the enclosure and the phase during the connecting operation, the position of the bushing should be well checked for the enclosure and the phase insulation board.

Finally, the operator injects three phases of the switch 1 and 2 side contacts of the mobile transformer car 2 to check the abnormality of the switch and the gas pressure, and the three phases of the switch low pressure side contacts of the mobile transformer car 2. It is put (S115).

Afterwards, the worker who installed the insulation cradle to keep the secondary terminals in an insulated state on the side of the ground transformer (T2) unscrews the busbar's tannery bolt for each phase separation (S116) of the secondary side. ) And store it in an insulated holder. In this case, the busbars of the ground transformer (T2) are separated in the order of X1, X2, X3. Of course, the secondary terminal of each phase should be separated to complete the load switching operation.

After completing the preparatory work, the worker performs the live wire separation of the ground (replacement) transformer (T2).

First, the operator attaches the left and right coordinate ruler to the upper side of the ground transformer T2 in preparation for the separation of the primary side A circuit (S117), attaches the coordinate setting probe to position the elbow restraint part of the switchgear, and the operation ring of the elbow. Set the coordinates according to the wealth. That is, the operator reads and records the X and Y axis coordinates of the elbow connecting members H1A, H2A, H3A, H1B, H2B, and H3B.

In order to separate the primary A circuit, the operator installs an insulation plug SOP on the ground transformer 2 (S118), while separating the elbows of the elbow connecting members H1A, H2A, and H3A (S119) and then insulates the insulation. The elbow is connected to the plug SOP (S120). At this time, the other side of the elbow connecting member (H1A) (H2A) (H3A) can be connected (S121) after the silicone grease is applied.

After installing the insulation plug (SOP) in the elbow connector (H1A) (H2A) (H3A) through the above process, remove the elbow of the elbow connector (H1A) (H2A) (H3A) and then elbow connector (H1A) (H2A) After connecting the insulation cap to (H3A), the operator separates the primary B circuit (S123) (S127), which is repeated for the elbow connection material (H1B) (H2B) (H3B).

The operator who installed the insulation plug (SOP) on the ground transformer (T2) (S124), the elbow restraint portion of the switchgear holding the elbow in accordance with the elbow connector (H1B) (H2B) (H3B) coordinates and press the open button of the switchgear to elbow To be separated live (S125). Then, the operator operates the switchgear so that the separated elbow is positioned at the inlet of the insulation plug (SOP) to confirm that the operation shafts coincide with each other. Then, by pressing the input button, the elbow is lively connected (S126) and then the ground transformer (T2), Remove the transformer to be replaced (S128).

Here, to remove the ground transformer T2, the operator adjusts the lower cylinder of the switchgear to separate the ground transformer T2, and then confirms that the primary and secondary cables are sufficiently stable and lifts the ground transformer T2. After handling the terminals that hinder the lifting, dismantle and dismantle the front lower part fixing part of the ground transformer (T2).

After the thorough work of the ground transformer (T2) is completed, the worker installs a new transformer using a crane (S129).

After that, the power of the primary B circuit is connected (S130). For this purpose, the operator sets the primary bushing coordinates for the elbow connector (H1A) (H2A) (H3A) (H1B) (H2B) (H3B) and replaces it. Install an insulation plug (SOP) on the transformer (S131). The elbow restraint of the switchgear is held in line with the elbow of the parking stand, press the open button of the switchgear to release the elbows (S132), and operate the switchgear to the bushing insert inlet of the elbow connector (H1B). The operator who made the position to confirm that the operation axis is matched and press the input button to make the elbow live connection (S133).

The above S131 to S133 are repeatedly made also for the elbow connecting member H2B and H3B (S134).

For each phase-specific connection (S135) on the secondary side, the operator connects the forceps-type and rotary fixed connection devices in the order of busbars X1, X2, and X3 of the replacement transformer. In particular, in order to prevent contact between the enclosure and the phase during the connecting operation, the position of the bushing should be well checked for the enclosure and the phase insulation board.

The operator who opened the three-phase switch-opener low-pressure contact point of the switchboard of the mobile transformer car 2 opened the three-phase switchgear of the switchboard 2 and the primary-side contact point of the transport-transformer car 2 (S136) (S137) to check for abnormality of the switch and the gas. Check the pressure.

The operator connects the power supply of the primary A circuit to set the primary side bushing coordinates for the elbow connector (H1A) (H2A) (H3A), install the transformer junction holder, and attach the junction (1) to which the cable is connected (S139). ).

Then, the operator who installed the junction in the transformer grabs the elbow restraint of the switchgear according to the elbow connector (H1A) coordinates and presses the open button of the switchgear to release the elbow (S140) and operates the waste device to separate the elbow. The operator who is positioned at the bushing insert inlet of the elbow connection member H1A of the junction 1 confirms that the operation shaft is matched, and presses the input button to make the elbow live connection (S141).

The above S139 to S141 is also made repeatedly for the elbow connecting member (H2A) (H3A) (S142).

After completing the replacement of the ground transformer with a new transformer (S143), the operator notifies this to the command room (S144).

The replacement method of the present invention is not only applied to the transformer replacement of the embodiment description of the present invention but also applicable to the replacement of the switchgear and the cable of the underground distribution line, and the replacement described in the claims of the present invention for the replacement of such equipment. It is noted that applying the method belongs to the scope of the present invention.

As described in detail above, according to the present invention, a temporary power failure after replacing the transformer on the existing underground distribution line and performing the replacement work, the customer of a number of homes or businesses have to suffer inconvenience or economic loss Unlike the construction method, the cable junction application method or the bypass cable application method is used to replace the transformer on the underground distribution line with uninterrupted power, thereby reducing the inconvenience or economic loss of customers such as many homes or businesses that are powered by the underground distribution line. There is an effect that can prevent the occurrence.

Claims (9)

A first step of determining whether to apply the uninterruptible method by checking the fixation state of the ground transformer elbow connection member (H1A) (H2A) (H3A) (H3A) (H1B) (H2B) (H3B); If the uninterruptible method is applicable, install the junction on the ground transformer to connect the ground transformer and the junction for separation of the primary A circuit, remove the elbows of the elbow connector (H1A) (H2A) (H3A), and then A second step of connecting to the junction; The primary and secondary three phases of the switchgear are put together and the secondary side is separated for each phase and stored in the insulation holder.The insulation plug (SOP) is installed on the ground transformer and the elbow connection material (H1A) (3) removing the elbow (H2A) (H3A) and connecting the elbow to the insulation plug (SOP) and dismantling the ground transformer; After installing the new transformer at the position where the ground transformer was removed in the third step, install an insulation plug (SOP) in the transformer to connect the power to the primary B circuit, remove the elbow of the insulation plug (SOP), and then elbow connecting member A fourth step of connecting the elbows of H1B, H2B, and H3B; And A fifth step of installing an junction in a transformer for connecting power to the primary side A circuit, disconnecting the elbow of the junction, and then connecting the elbow to the elbow connecting members H1A, H2A, and H3A; Method of replacing the ground transformer of the underground distribution line by the uninterruptible method, characterized in that consisting of. The method of claim 1, The first step further comprises the step of looping the power of the ground transformer by inputting the contacts of the normally open switch in the power switch of both sides connected to the ground transformer, the ground transformer of the underground distribution line by the uninterruptible method How to replace. The method of claim 1, In the second stage, the ground transformer elbow connection member H1A, H2A, H3A, H1B, H2B, and H3B are fixed by a live switchgear. How to replace the transformer. The method of claim 1, In the second step, the elbow is installed on one side of the junction and the other side of the ground transformer replacement method of the underground distribution line by the uninterruptible method characterized in that the installation of the insulating cap. Connect and install the bypass cable to the switch (S1) (S2) adjacent to the ground transformer to be replaced and check the fixation status of the ground transformer elbow connector (H1A) (H2A) (H3A) (H1B) (H2B) (H3B). A first step of determining whether to apply the uninterruptible construction method; If the uninterruptible method is applicable, the insulation plug (SOP) is installed on the ground transformer to separate the primary A circuit, and the elbow of the elbow connector (H1A) (H2A) (H3A) is removed and the insulation plug (SOP) is removed. Connecting the elbow to the second step; After the above step 2, in order to separate the B circuit of the primary side, install an insulation plug (SOP) in the ground transformer, remove the elbows (H1A) (H2A) (H3A) elbow, and then place the elbow on the insulation plug (SOP). Connecting and dismantling the ground transformer; After installing the new transformer at the position where the ground transformer was removed in the third step, install an insulation plug (SOP) in the transformer to connect the power to the primary B circuit, remove the elbow of the insulation plug (SOP), and then elbow connecting member A fourth step of connecting the elbows of H1B, H2B, and H3B; And A fifth step of installing an junction in a transformer for connecting power to the primary side A circuit, disconnecting the elbow of the junction, and then connecting the elbow to the elbow connecting members H1A, H2A, and H3A; Method of replacing the ground transformer of the underground distribution line by the uninterruptible method, characterized in that consisting of. The method of claim 5, The first step further comprises the step of looping the power of the ground transformer by inputting the contacts of the normally open switch in the power switch of both sides connected to the ground transformer, the ground transformer of the underground distribution line by the uninterruptible method How to replace. The method of claim 5, In the first step, the ground transformer replacement of the underground power distribution line by the uninterruptible method, further comprising the step of collectively inputting the first, second and third phases of the switchgear and separating the secondary side by phase for each phase. Way. The method of claim 5, In the second stage, the ground transformer elbow connection member H1A, H2A, H3A, H1B, H2B, and H3B are fixed by a live switchgear. How to replace the transformer. The method of claim 5, The ground transformer replacement method of the underground distribution line by the uninterruptible method, characterized in that the insulating cap is installed after separating the elbow from the elbow connecting member in the second step.

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