KR20210145429A - Potential Transformer Replacement Operation Standard Procedure and Temporary Power Supply Device, Load Break Switches for Underground Line - Google Patents

Abstract

In a ground switch PT replacement standardization method using a temporary power transmission device (1) of the present invention, if a potential transformer (PT) (140) of a ground switch (100) is defective or damaged, one among an electrical equipment ceasefire response (S20, S30-S50/S30-1, S30-2, S100), temporary power transmission establishment (S60-1), replacement of defective PT on-site (S70), and on-site inspection of defective PT (S80) is selected based on a standard operation manual. In a temporary transmission establishment state using the temporary power transmission device (1), defective PT field replacement (S70) is on-site constructed according to a work procedure of the standard operation manual. Thus, it is possible to improve the safety/efficiency of the PT replacement work and minimize the power outage time. In particular, through the establishment of a standard operation manual of the PT replacement standardization method, a usable switchgear is reused without waste disposal, eliminating waste factors, extending the life of equipment and maximizing the effect of use, and implementing the characteristics of economical power distribution facility construction.

Description

Potential Transformer Replacement Operation Standard Procedure and Temporary Power Supply Device, Load Break Switches for Underground Line

The present invention relates to PT (Potential Transformer) replacement of ground switchgear. In particular, through the establishment of a PT replacement standardization method, the working environment that required blackout time for ground switchgear is improved, and the PT body that can be used only by PT replacement is not disposed of as a temporary waste. It is related to the standardization method of replacing the ground switch PT using a power transmission device.

In general, ground switchgear is an automatic switchgear and is installed on a 22.9kV-y three-phase underground distribution line, and an internal power supply (Potential Transformer) (hereinafter referred to as PT (Potential Transformer)) Power must be supplied from the power supply, and the supplied power is a facility that requires constant supply of power for opening and closing through the control cable by charging the control power storage battery in the control box.

For example, the PT is a device that supplies power to a terminal device by converting a primary voltage of 13,200 [V] into a secondary voltage of 220 [V]. have.

Therefore, the PT applies a ground switch PT replacement method that shortens the blackout time for the corresponding switch as much as possible during the replacement operation when the PT is damaged.

Domestic Patent Publication 10-2019-0138501 (December 13, 2019)

However, the existing ground switch PT replacement method takes excessive power outage time due to the replacement of the PT required for constant power supply, and the PT replacement method is not standardized, so it has a fundamental problem that it is insufficient to reduce the blackout time have.

In particular, the existing ground switch PT replacement method is a waste factor that extends the lifespan of equipment and has a low utilization effect by disposing of ground switches that can be used only by simple PT replacement due to the absence of a replacement method and work procedure for the burnout of the PT for supplying ground switch control power. also have

Therefore, in consideration of the above points, the present invention is a temporary power transmission device that maintains the power transmission function of the PT as a temporary power transmission device even under the PT burnout, thereby improving the safety and efficiency of the work at the same time, while also requiring normalization after maintenance of the ground switch. It reduces the power outage time as much as possible, and in particular, the PT replacement standardization method has been established as a standard operation manual, so it is economical by extending the lifespan of equipment and maximizing the effect of use by eliminating the waste factor that is currently disposing of switchgear that can be used only by simple PT replacement. The purpose of this is to provide a standardized method for replacing ground switch PT using a temporary power transmission device capable of constructing a power distribution facility.

The ground switch PT replacement standardization method of the present invention for achieving the above object is a step in which the PT defect is confirmed in the ground switch, and after the PT defect is confirmed, an electrical facility truce is established based on the standard operation manual, and a temporary power transmission response , selecting any one of performing a PT replacement work procedure in which a defective PT on-site replacement is made and a PT inspection work procedure in which a defective PT on-site inspection is made, and the step of constructing the work procedure of the standard work manual on site do.

On the other hand, in the ground switch PT replacement standardization method of the present invention for achieving the above object, when the PT defect check for the PT of the ground switch is made, the truce consultation work procedure for the truce of the surrounding facilities is not required. A step of performing on-site work procedures for ground switchgear, a step of performing a PT replacement work procedure that replaces the defective PT after temporary power transmission is established with the construction of a temporary power transmission device for the ground switch when holding PT materials, and non-owned PT materials It is characterized in that it includes a step of performing a PT check operation procedure for checking the defective PT after the construction of the insulation cap for the ground switch.

As a preferred embodiment, the step of responding to the truce of the electrical equipment is divided into a field-implemented work procedure corresponding to the occurrence of a temporary blackout of the ground switch and a work procedure for truce consultation corresponding to the occurrence of a failure of the ground switch.

As a preferred embodiment, the steps of the field-implemented work procedure are performed with a line load changeover for a PT temporary failure of the PT, and a step with establishing a switchgear oblique state.

As a preferred embodiment, the steps of the truce consultation work procedure include a step in which a work-site truce is made through an electrical facility in charge, a step in which a cease-fire schedule is established for the work site, and a ground switch PT replacement work is stopped due to the non-establishment of the cease-fire schedule This is carried out in the following steps.

In a preferred embodiment, the steps of the operation site ceasefire and the establishment of the ceasefire schedule are converted into the phases of the field implementation work procedure.

As a preferred embodiment, the on-site work procedure includes a work order number, and work order #1 among the work order numbers is the execution of a safety meeting of work section/content description/mission assignment, and work order #2 is safety slogan proposal/traffic control /Pedestrian freedom establishment, work order #3 is material and tool arrangement/labor cone installation/safety signboard installation, work order #4 is live wire rubber insulated gloves/distribution automation switch PT/temporary power transmission device/insulation cap/other related tools check, work In sequence #5, the working standard for electric detection by maintaining the switch's oblique state is presented.

As a preferred embodiment, the step of establishing the temporary power transmission is a step in which it is confirmed that the PT material to replace the PT defect is secured, the special high voltage bushing of the ground switch is separated, the special high voltage bushing is combined with the temporary power transmission insulating bushing It is carried out in a step in which the escape prevention clamp is fastened in the closed state, a step in which the switch is put in, and a step in which temporary power transmission is made.

As a preferred embodiment, the step of replacing the defective PT on-site includes the steps of grounding the ground terminal of the ground switch, separating the PT-side primary bushing of the ground switch, and charging current for the first bushing. Discharging, protecting the primary bushing to prevent dust penetration, separating and protecting the secondary bushing on the PT side, replacing the PT with a new PT after separating the PT, and the After the primary bushing and the secondary bushing are assembled in the reverse order of separation, the above ground switch is operated.

As a preferred embodiment, the replacement of the defective PT on-site includes a work sequence number, the work sequence number #1 among the work sequence numbers is grounding of the ground switch, and the operation sequence #2 is the separation and protection of the PT side primary bushing, work Sequence number #3 is the separation and protection of the secondary bushing on the PT side, operation sequence #4 is the removal/installation of the PT body according to the securing of new PT products, operation sequence #5 is the control power cable connection, and operation sequence #6 is the cleaning cloth. Washing of the bushing used, work sequence #7 is insulation grease application, operation sequence #8 is the combination of the primary and secondary bushings, operation sequence #9 is ground terminal connection, operation sequence #10 is control power cable connection, Work order #11 is the interlocking test and operation status check after PT replacement, work order #12 is the secondary voltage measurement of the replacement PT, and work order #13 is the work standard for cleaning and arranging around the work area.

As a preferred embodiment, in the step of inspecting the defective PT on-site, the ground terminal of the ground switch is grounded, the separation of the PT side primary bushing of the ground switch is made, and the charging current for the first bushing is Discharging, protecting the primary bushing to prevent dust penetration, separating and protecting the secondary bushing on the PT side, separating the PT, storing the separated PT connection cable, After cleaning the bushing using a washing cloth and applying insulating grease, an insulating cap for the special high-voltage bushing of the above-ground switch is installed, and a manual operation for the above-ground switch is performed.

As a preferred embodiment, after the manual operation, the truce consultation operation procedure step is switched to the electrical equipment truce response.

As a preferred embodiment, the defective PT on-site inspection includes a work order number, work order #1 among the work order numbers is grounding of the ground switch, and work order #2 is the separation and protection of the PT side primary bushing, work Sequence #3 is the separation and protection of the secondary bushing on the PT side, work sequence #4-1 is separation/storage of the PT connection cable, cleaning the bushing using a cleaning cloth, applying insulating grease, installing the insulating cap, and working sequence #4 In -2, the working standard for checking whether the insulation cap is abnormal after the PT separation is presented.

And the temporary power transmission device of the present invention for achieving the above object is a temporary power transmission insulation bushing that functions as a PT primary insulation bushing in the state of PT burnout by being combined with a special high voltage bushing of a ground switch, and the temporary transmission insulation bushing and It is characterized in that it includes an anti-separation clamp that is fastened to form a fixing force for the special high-pressure bushing.

As a preferred embodiment, the temporary power transmission insulating bushing is composed of an insulating bushing body made of an elbow structure, a clamp ring coupled to the escape prevention clamp, and a bushing cover coupled to cover the special high-voltage bushing; The anti-separation clamp includes a clamp body coupled to the clamp ring, a hinge clamp for fixing the insulating bushing body, and a spring for applying a spring elastic force toward the special high-pressure bushing.

As a preferred embodiment, a bushing connection terminal coupled to the special high-pressure bushing protrudes from the bushing cover. The springs are coil springs respectively provided on the left and right sides of the clamp body.

The ground switch PT replacement standardization method using the temporary power transmission device of the present invention implements the following actions and effects.

First, by maintaining temporary power transmission with the PT conversion device, the standardization method of separately replacing only the PT in the ground switch can be established as a standard operation manual. Second, by replacing only the PTs separately through the PT replacement standardization method, the blackout problem that inevitably occurred until the ground switch was replaced can be solved with a simple operation. Third, by simply replacing the PT in the event of a PT failure due to poor insulation without disposing of the usable ground switch, it is possible to build an economical power distribution facility by extending the lifespan of equipment and maximizing the utilization effect, and also reduces the power outage time and safety of work By simultaneously improving the efficiency, the competitive advantage is also a very large technical advantage. Fourth, since the PT conversion device that maintains temporary power transmission is used, it can be used immediately in the field without additional technology development to minimize the inevitably blackout time until the corresponding ground switch or PT replacement. Fifth, by establishing a standardized method of replacing only PTs separately, it is possible to create a work site where power failure time is drastically reduced and safety is the top priority, so continuous use is possible.

1 is a flowchart of a ground switch PT replacement standardization method according to the present invention, and FIG. 2 is a configuration diagram of a temporary power transmission insulation bushing and separation prevention clamp constituting a temporary power transmission device applied to a ground switch PT replacement standardization method according to the present invention 3 is a state in which the temporary power transmission insulation bushing and the separation prevention clamp according to the present invention are combined with the extra-high voltage bushing of the ground switchgear, and FIG. 4 is an example of the occurrence of defective PT in the ground switch according to the present invention, FIG. According to the present invention, when the ground switch PT is defective, the on-site work procedure standardization work state, FIG. 6 is a state in which the temporary power transmission insulation bushing and the departure prevention clamp according to the present invention perform temporary power transmission of the ground switchgear, and FIG. 7 is the present invention is a flow chart of the PT replacement operation procedure according to , FIGS. 8 to 10 are the standardization operation status of the PT replacement operation procedure according to the present invention, FIG. 11 is a flowchart of the PT inspection operation procedure according to the present invention, and FIG. It is a standardization work state of the PT inspection work procedure according to the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying illustrative drawings, and since these embodiments are examples, those of ordinary skill in the art to which the present invention pertains may be implemented in various different forms. It is not limited to the embodiment.

Referring to Figure 1, the ground switch PT replacement standardization method is based on the standard operation manual after confirming the PT (Potential Transformer) failure (or defective or damaged) of the distribution intelligent ground switch (S10 ~ S20) to respond to the truce of electrical equipment (S20, S30~S50/S30-1,S30-2,S100), temporary power transmission establishment (S60-1), PT replacement work procedure for defective PT on-site replacement (S70), and PT inspection work procedure for defective PT on-site inspection Any one of (S80) is selected, and the work procedure of the standard work manual is constructed and performed on site.

In particular, the standard work manual is not the truce consultation work procedure (S20, S30-1, S30-2, S100) in which the electricity supply to the surrounding electrical facilities is stopped, but the on-site work procedure (S20, S30~S50). The work procedure is divided to perform the PT replacement work procedure (S70) after temporary transmission establishment (S60-1) when holding the PT material (S60), or to perform the PT check work procedure (S80) when the PT material is not held (S60). .

Therefore, the above ground switch PT replacement standardization method establishes the PT replacement operation procedure standard for control power supply with the PT replacement operation procedure (S70) and PT inspection operation procedure (S80). By preventing safety accidents and unnecessary replacement of switchgear, it is possible to build an economical power distribution facility by extending the lifespan of equipment and maximizing the effect of utilization. As the PT that is burned out by using it as equipment is quickly separated, it can form a state in which temporary power transmission is possible in the shortest time.

Meanwhile, FIGS. 2 to 3 show the configuration of a temporary power transmission device 1 that enables establishment of a PT replacement operation procedure standard for supplying control power by the PT replacement operation procedure (S70) and the PT inspection operation procedure (S80).

Referring to FIG. 2 , the temporary power transmission device 1 has excellent electrical, mechanical, and thermal characteristics, prevents moisture penetration, and functions as a PT primary insulation bushing that does not deteriorate even after long-term use. A temporary power transmission insulation bushing 10 and a release prevention clamp 20 that functions as a spring-fixed elbow release prevention clamp to prevent dropout and poor contact due to cable vibration.

Specifically, the temporary power transmission insulation bushing 10 has an insulation bushing body 11, a clamp ring 13 and a bushing cover 15 as components, and the separation prevention clamp 20 includes a clamp body 21, a hinge The clamp 23 and the spring 25 are components.

For example, in the temporary power transmission insulation bushing 10, the insulation bushing body 11 is made of a “L”-shaped elbow structure, so that the connection to the special high voltage bushing 110 in the internal space of the ground switch 100 is performed. It is useful to form, and the clamp ring 13 has a clasp structure and is used as a portion to which the release prevention clamp 20 is coupled, and the PT cover 15 has a funnel structure, so that it is easy to wrap the PT 110 . do.

In particular, a bushing connection terminal 15 - 1 is formed on the bushing cover 15 , and the bushing connection terminal 15 - 1 has a protruding structure fitted into a groove of the PT 110 .

For example, in the anti-separation clamp 20, the clamp body 21 has an oval plate structure in which an opening channel is formed in the middle portion, so that the clamp ring 13 is inserted into the opening channel and the insulating bushing body The hinge clamp 23 is easily coupled to the elbow bent portion of 11, and the hinge clamp 23 is coupled in a hinge structure around the opening channel of the clamp body 21, so that the insulation bushing body 11 elbow portion in a state lying on one side. and a fixing force, and the spring 25 is made of a coil spring structure, so that the fixing force of the insulating bushing body 11 to the elbow portion is strengthened by spring elasticity.

In particular, the spring 25 is provided on the left and right sides of the clamp body 21 to form a more stable and balanced fixing force due to spring elasticity, and to prevent falling off and poor contact due to external influences such as cable vibration and vehicle collision after coupling. effective to do

Referring to FIG. 3 , an example of use of the temporary power transmission insulating bushing 10 and the separation prevention clamp 20 is illustrated.

For example, in the assembled state of the temporary power transmission device 1, the temporary power transmission insulation bushing 10 and separation are prevented with a simple operation of inserting the clamp ring 13 of the insulating bushing body 11 into the opening channel of the clamp body 21 The clamps 20 are coupled to each other. Then, the two springs 25 are positioned from the left and right sides of the clamp body 21 to the PT cover 15 portion.

Then, in the insulating state of the temporary power transmission device (1), the bushing connection terminal (15-1) is inserted into the groove portion of the extra-high voltage bushing (110) of the ground switch (100) while the bushing cover (15) is connected to the extra-high voltage bushing (110). ) and then lay the hinge clamp 23 to one side. Then, the bushing cover 15 forms a strong fixed state with the extra-high pressure bushing 110 part by the elbow part contact force of the hinge clamp 23 and the spring elastic force of the spring 25 .

Hereinafter, the above ground switch PT replacement method of FIG. 1 will be described in detail with reference to FIGS. 3 to 12 .

First, for the PT failure of the intelligent distribution type ground switch in step S10, as in S20, the occurrence of temporary/instant power failure (or no power outage) or failure of the ground switch without blackout is confirmed.

Referring to FIG. 4 , an example of a ground switchgear operation status due to a defective PT is exemplified. As shown, it can be seen that various cases of temporary power failure and instantaneous power failure are exemplified among the failure types that cause the occurrence of a bad PT.

In particular, the PT burnout of the ground switchgear according to the above fault type causes a temporary power outage until the corresponding switchgear is replaced, which inevitably causes inconvenience or economic loss to consumers such as numerous homes and businesses.

As an example, Tables 1 and 2 below illustrate the PT burnout status.

As shown in the breakdown status of ground switchgear in Table 1 (recent 5 years) and PT burnout in Table 2, the number of blackouts due to defective ground switch manufacturing is increasing every year, and the share of temporary power outages due to poor PT insulation is 4.5%. is reaching

Specifically, as for the ripple type caused by PT burnout, 73.9% of cases where only external power is lost and no power outage occurs, momentary power failure 24.6%, and temporary power failure account for 1.5%. The main cause of PT burnout is air bubbles in the high-voltage winding layer It is summarized as a problem in the manufacturing process in which the interlayer insulation of the primary winding part is destroyed due to partial discharge caused by

In particular, when the defect period elapses, the replacement work for the PT burnout of the ground switch is performed without the manufacturer of the switch, but since there is no separate replacement method and work procedure for each manufacturer, the entire switch is replaced, resulting in a huge waste of manpower and budget. am.

Then, the step S20 is a response step of making temporary/instantaneous power failure (or no power outage) as a field-implemented work procedure (S20, S30~S50) for the PT damage of the ground switch, and a truce consultation work procedure (S20) , S30-1, S30-2, S100) is divided into corresponding steps and proceeds.

For example, in the field-implemented work procedure (S20, S30 ~ S50), if a temporary failure of the PT is confirmed in step S30, it proceeds to step S40, line load transfer is made in step S40, and the switchgear is in a slanted state (detection) in step S50. ) is established, PT material retention is confirmed in step S60. In this case, the switch slanted state (electric detection) (S50) is performed in the ground switch 100 as an operation for replacing the switch.

On the other hand, if the occurrence of temporary failure of the PT is not confirmed in step S30, it switches to step S50-1, returns the PT to a normal state, and the ground switch PT replacement work is stopped.

Referring to FIG. 5 , it can be seen that the field-implemented work procedures ( S20 , S30 - S50 ) are embodied as work divisions through work sequence numbers #1, #2, #3, #4, and #5.

For example, task number #1 is a safety meeting, which presents the meeting standards for task assignment along with work sections and contents explanation, and task sequence #2 presents the standards for establishing traffic control and pedestrian guidance along with safety slogans. Sequence #3 presents the standard for safety signage installation along with the installation of rubber cones by material and tool arrangement, and operation sequence #4 is based on the standards for live wire rubber insulation gloves, distribution automation switch PT, PT elbow insulation cap, and other related tools. The work sequence #5 is the operation for switching the switch, and it presents the standard for the inspection operation by maintaining the switch's oblique state.

Continuing, as an example, in the armistice consultation work procedure (S20, S30-1, S30-2, S100), a ceasefire is possible through the upper organ or department in charge in step S30-1, or an agreed time for the armistice schedule is reached in step S30-2 In one case, switch to the on-site work procedure (S20, S30~S50) and execute the line load transfer of S40, establishment of the switchgear gaze state (electrical detection) of S50, and the confirmation of holding of PT material in S60.

On the other hand, if an armistice schedule cannot be agreed upon in the S30-2 stage in a state where the armistice is not possible through the upper organ or department in charge in the S30-1 stage, the construction is impossible as in S100 and the ground switch PT replacement work is stopped.

Afterwards, if the PT material is retained in step S60, it enters the PT replacement work procedure of S70 after performing the temporary transmission establishment procedure as in S60-1, whereas if the PT material is not retained, it is converted to the PT inspection work procedure of S80.

As an example, the temporary power transmission establishment procedure (S60-1) is exemplified through FIG. 5 . In this case, the ground switch 100 is an automatic switch installed on a 22.9 kV-y three-phase underground distribution line, and the PT 110 converts a primary voltage of 13,200 [V] into a secondary voltage of 220 [V] to be a terminal device. It is an internal power supply device connected to the primary and secondary bushings 120 and 130 to supply power to the .

6, the temporary power transmission establishment procedure (S60-1) is ① PT burnout confirmation -> ② primary side separation for the special high voltage bushing 110 of the ground switch 100 -> ③ inserting an insulating bushing (or insulation Cap (30) coupling) -> ④ Switching in -> ⑤ Temporary power transmission is carried out. Here, “->” indicates the sequential order of the work procedure. In addition, “③ Insert the insulation bushing” indicates the PT replacement operation procedure (S70), while “③ Combine the insulation cap 30” indicates the PT check operation procedure (S80).

As such, the temporary power transmission insulation bushing 10 and the separation prevention clamp 20 of the temporary power transmission device 1 use the extra-high voltage bushing 110 of the ground switch 100, and through this, the ground switch 100 is damaged. Since the PT 110 can be quickly separated, it is possible to temporarily transmit power so that customer inconvenience or economic loss caused by an unexpected power failure due to the absence of the PT 110 of the ground switch 100 is minimized.

Finally, the PT replacement operation procedure ( S70 ) is illustrated through FIGS. 7 to 10 .

Referring to FIG. 7 , in the PT replacement operation procedure (S70), the grounding of the grounding terminal of S71 is performed, and the PT primary bushing (or PT primary bushing) separation is performed while wearing rubber insulating gloves of S72. , PT primary bushing (or PT primary bushing) charging current discharge of S73 is performed, and PT primary bushing (or PT primary bushing) protection treatment is performed to prevent dust penetration into the PT side of S74, and S75 Protective treatment is performed with separation of the PT secondary bushing (or PT secondary bushing) while wearing rubber insulating gloves, and replacement is performed after separation of the PT body using the new PT of S76.

Then, after PT replacement is completed through PT assembly in the reverse order of S77, PT 1st and 2nd bushings (or PT 1st and 2nd bushings) are assembled, and then normal operation of the ground switch is performed. That is, the reverse order PT assembly (S77) is S75's PT secondary bushing (or PT secondary bushing) connection and protection processing, S74's PT primary bushing (or PT primary bushing) protection processing, S72's PT primary bushing (or PT primary bushing) connection, it is performed by the action of the ground terminal of S71.

On the other hand, referring to FIGS. 8 to 10 , it can be seen that the PT replacement operation procedure ( S70 ) is embodied as a division of operations through operation sequence numbers #1 to #13.

Referring to FIG. 8 , the work sequence number #1 presents the work standard for grounding enforcement, and the task sequence #2 is the primary bushing 120 separation/charging current discharge/primary bushing 120 protection after wearing rubber insulating gloves, etc. For the PT (140) side of the primary bushing 120 for the standard of separation and protection work, work sequence #3 presents the standard of the separation and protection work of the secondary bushing 130 on the PT (140) side, Work sequence #4 presents the standard for PT body removal/new body construction work according to securing new PT products, and work sequence #5 presents the standard for control power cable connection work.

Referring to FIG. 9 , work sequence #6 suggests a standard for cleaning the bushing using a cleaning cloth, and job sequence #7 suggests a standard for insulating grease application, and job sequence #8 is the 1st and 2nd bushing (120,130) Suggests the standard of bonding work, work sequence #9 suggests the standard of ground terminal connection work, and work sequence #10 suggests the standard of control power cable connection work.

Referring to FIG. 10, work sequence #11 presents the standard of interlocking test and normal operation status check work according to PT replacement as line operation for normal operation, and work order #12 is PT secondary voltage measurement. Suggests the standard for secondary voltage measurement work, and the work sequence #13 is the finishing touch, and presents the standard for cleaning and arranging work around the work place.

Subsequently, the PT check operation procedure S80 is exemplified through FIGS. 11 to 12 .

11, in the PT check operation procedure (S80), the grounding of the grounding terminal of S81 is performed, and the PT primary bushing (or PT primary bushing) separation is performed while wearing the rubber insulating gloves of S82. , PT primary bushing (or PT primary bushing) charging current discharge of S83 is performed, and PT primary bushing (or PT primary bushing) protection processing is performed to prevent dust penetration into the PT side of S84, and S85 Protective treatment is performed with separation of the PT secondary bushing (or PT secondary bushing) while wearing rubber insulated gloves, the PT of S86 is separated from the existing PT body that has been damaged, storage of the separated PT connection cable of S87 and After cleaning the bushing using a cleaning cloth and applying insulating grease, the insulating cap 30 is installed. In this case, the construction of the insulation cap 30 is the same as the step ③ of the insulation cap 30 coupling of the temporary power transmission establishment procedure (S60-1) of FIG. 6, so it means that it can be omitted from the PT check operation procedure (S80). .

Then, manual operation of S88 is performed, and after performing the manual operation (S88), the truce agreement work procedure (S20, S30-1, S30-2, S100) of the truce through the upper organ or department in charge of S30-1 This will switch to the possible inquiry stage.

Therefore, it can be seen that the PT check operation procedure ( S80 ) can be switched to the PT replacement operation procedure ( S70 ) depending on whether there is a ceasefire.

Meanwhile, referring to FIG. 12 , it can be seen that the PT check operation procedure ( S80 ) is embodied as a division of operations through operation sequence numbers #1, #2, #3, #4-1, and #4-2.

As an example, work sequence number #1 presents the work standard for grounding enforcement, and task sequence number #2 is PT ( 140) presents the standard of the primary bushing 120 separation operation, and the operation sequence #3 presents the standard of the separation operation of the secondary bushing 130 on the PT 140 side for the protection of the secondary bushing 130 .

On the other hand, work sequence #4-1 is the application of the insulation cap 30 according to the non-secured PT, and presents the standards for storing and storing the PT connection cable, cleaning the bushing using a cleaning cloth, applying insulation grease, and installing the insulation cap. . And work sequence #4-2 presents a standard for checking whether there is an abnormality in the construction of the insulating cap 30 after PT separation.

As described above, the ground switch PT replacement standardization method using the temporary power transmission device 1 according to the present embodiment is based on a standard operation manual when the PT (Potential Transformer) 140 of the ground switch 100 is defective or damaged. to respond to the truce of electrical equipment (S20,S30~S50/S30-1,S30-2,S100), temporary power transmission establishment (S60-1), replacement of defective PT on-site (S70), and on-site inspection of defective PT (S80) In the state of temporary power transmission established using the temporary power transmission device (1), defective PT on-site replacement (S70) is performed on-site according to the work procedure of the standard work manual, so the safety/efficiency of the PT replacement work can be improved and the power outage time can be minimized. In particular, through the establishment of a standard operation manual of the PT replacement standardization method, usable switchgear is used without waste treatment, eliminating waste factors, extending the lifespan of equipment and maximizing the utilization effect, and constructing an economical power distribution facility.

1: Temporary power transmission device
10: temporary power transmission insulation bushing 11: insulation bushing body
13: clamp ring 15: bushing cover
15-1: bushing connection terminal
20: anti-separation clamp 21: clamp body
23: hinge clamp 25: spring
30: insulation cap
100: ground switch 110: extra high pressure bushing
120,130: 1st and 2nd bushings 140: PT (Potential Transformer)

Claims (17)

A step in which the PT defect check of the PT (Potential Transformer) is made in the ground switch, and
After confirming the above PT defect, based on the standard work manual, select either one of the PT replacement work procedure for responding to the truce of electrical equipment, the establishment of temporary power transmission, and the replacement of the defective PT on-site and the PT inspection work procedure for the on-site inspection of the defective PT. , the step in which the work procedure of the standard work manual is constructed on site
Ground switch PT replacement standardization method, characterized in that it is included.
The ground level according to claim 1, wherein the step of responding to the truce of the electrical equipment is divided into a field-implemented work procedure corresponding to the occurrence of a temporary power outage of the ground switch and a truce consultation work procedure corresponding to the occurrence of a failure of the ground switch. Switchgear PT replacement standardization method.
The method according to claim 2, wherein the steps of the field-implemented work procedure include: performing a line load transfer for a PT temporary failure of the PT; and establishing a switchgear oblique state.
Ground switch PT replacement standardization method, characterized in that performed with
The method according to claim 2, wherein the steps of the truce consultation work procedure include: a step in which a work site truce is made through an authority in charge of electrical facilities; a step in which a ceasefire schedule is established for the work site; Steps in which this takes place
Ground switch PT replacement standardization method, characterized in that performed with
The ground switch PT replacement standardization method according to claim 4, wherein the stage of the work site ceasefire and the stage of establishing the ceasefire schedule are converted into the stage of the field implementation work procedure.
The method according to claim 2, wherein the field-implemented work procedure includes a work order,
Among the above work order numbers, work order #1 is safety meeting of work section/content explanation/mission assignment, work order #2 is safety slogan proposal/traffic control/establishment of pedestrian freedom, work order #3 is material and tool arrangement/labacon installation / Safety signboard installation, work order #4 is live wire rubber insulated gloves/distribution automation switch PT/temporary power transmission device/insulated cap/other related tools check, work order #5 is the work standard for inspection by maintaining the switchgear in an oblique state Ground switch PT replacement standardization method, characterized in that
The method according to claim 1, wherein the step of establishing temporary power transmission is a step in which it is confirmed that a PT material to replace the PT defect is secured, the special high voltage bushing of the ground switch is separated, and the special high voltage bushing is combined with the temporary power transmission insulating bushing. A step in which the escape prevention clamp is fastened in the closed state, a step in which the switch is put in, and a step in which temporary power transmission is performed
Ground switch PT replacement standardization method, characterized in that performed with
The method according to claim 1, wherein the step of performing the PT replacement work procedure comprises the steps of grounding the ground terminal of the ground switch, separating the PT-side primary bushing of the ground switch, and charging current for the first bushing discharging, protecting the primary bushing to prevent dust penetration, separating and protecting the PT-side secondary bushing is performed, replacing the PT with a new PT after separation of the PT, and After the primary bushing and the secondary bushing are assembled in the reverse order of separation, the ground switch is operated
Ground switch PT replacement standardization method, characterized in that performed with
The method according to claim 1, wherein the PT replacement operation procedure execution includes a task sequence number,
Among the above work sequences, work sequence #1 is grounding of the ground switch, work sequence #2 is the separation and protection of the PT side primary bushing, and work sequence #3 is the PT side secondary bushing separation and protection, work sequence number #4 is demolition/new construction of the PT body according to the securing of new PT products, operation sequence #5 is control power cable connection, operation sequence #6 is the cleaning of the bushing using a cleaning cloth, operation sequence #7 is insulation grease application operation, operation sequence number #8 is the combination of the 1st bushing and the 2nd bushing, work order #9 is ground terminal connection, work order #10 is control power cable connection, work order #11 is interlock test and operation status check after PT replacement, work order #12 is the secondary voltage measurement of the replacement PT, and the work order #13 is the work standard for cleaning and arranging the work area around the ground switch PT replacement standardization method.
The method according to claim 1, wherein the step of performing the PT inspection work procedure comprises the steps of grounding the ground terminal of the ground switch, separating the PT-side primary bushing of the ground switch, and charging current for the first bushing discharging, protecting the primary bushing to prevent dust penetration, separating and protecting the secondary bushing on the PT side, separating the PT, storing the separated PT connection cable , After cleaning the bushing using a washing cloth and applying insulating grease, an insulating cap for the special high-voltage bushing of the above-ground switch is installed, and manual operation of the above-ground switch is performed.
Ground switch PT replacement standardization method, characterized in that performed with
The method according to claim 10, wherein the ground switch PT replacement standardization method is converted to the stage of the truce consultation work procedure in response to the truce of the electrical equipment after the manual operation.
The method according to claim 1, wherein the performing of the PT inspection work procedure includes a work order, and among the work order numbers, work order #1 is grounding of the ground switch, and work order #2 is separation and protection of the PT side primary bushing, Task #3 is the separation and protection of the secondary bushing on the PT side, and task #4-1 is separation/storage of the PT connection cable, cleaning the bushing using a cleaning cloth, applying insulating grease, installing the insulating cap, and working sequence # 4-2 is a ground switch PT replacement standardization method, characterized in that the work standard for checking whether the insulation cap is abnormal after the PT separation is presented.
Temporary power transmission insulating bushing that functions as a PT primary insulating bushing in the state of PT (Potential Transformer) burnout by combining with the special high voltage bushing of the ground switch, and the temporary power transmission insulating bushing to form a fixing force for the special high voltage bushing Anti-separation clamp
Temporary power transmission device, characterized in that it is included.
The method according to claim 13, wherein the temporary power transmission insulating bushing is composed of an insulating bushing body made of an elbow structure, a clamp ring coupled to the separation preventing clamp, and a bushing cover coupled to cover the special high-voltage bushing;
The anti-separation clamp comprises a clamp body coupled to the clamp ring, a hinge clamp for fixing the insulating bushing body, and a spring for applying a spring elastic force toward the special high-voltage bushing.
The temporary power transmission device according to claim 14, wherein a bushing connection terminal coupled to the special high-voltage bushing protrudes from the bushing cover.
The temporary power transmission device according to claim 14, wherein the springs are provided on the left and right sides of the clamp body, respectively.
The temporary power transmission device according to claim 16, wherein the spring is a coil spring.

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