KR20230008552A - Line failure section indicator for reducing fault patrol section of power distribution - Google Patents

Abstract

The present invention provides a fault section indicator for reducing a fault inspection section of power distribution equipment, which can reduce an inspection section of a distribution line and quickly identify and restore fault sites. According to the present invention, the fault section indicator for reducing a fault inspection section of power distribution equipment comprises: a CT core part making up CT for detecting an alternating current flowing in a target line in a noncontact manner; a display part activated by a current detected in the CT to visually display the current to the outside; and a grip part having a cut groove formed in a V-shape and two branches branching by the cut groove. A gripper capable of gripping the line while enclosing the CT core part therein is formed on ends of the branches. Male screw threads are formed on the outer surface including the lower end of the cut groove of the grip part. The display part includes: a Y-shaped display frame arranged on a lower area of the male screw threads; and a cover frame made of a material through which the visual display of the display part passes, having a thimble shape protecting the display part, and having female screw threads formed on the inner surface thereof to be coupled to the male screw threads.

Description

Fault section indicator for reducing instantaneous section of power distribution facility failure

The present invention relates to a failure section indicator capable of reducing a distribution facility failure instantaneous section for a wide instantaneous section related to a distribution facility failure that delays the identification of a fault location and preventing a distribution line failure through the extraction of defective equipment.

In general, large power generated in a power plant is transmitted to a substation through a transmission line connected to and supported by a transmission tower or the like. In the substation, the received transmission voltage is stepped down to distribution voltage, and then supplied as single-phase or three-phase power to homes or industries through underground wiring pipes or distribution lines connected to utility poles.

In order to improve electrical safety and power consumer satisfaction in real life, failures occurring in distribution lines must be promptly dealt with. A line patrol is performed immediately after a distribution line failure occurs, but due to the wide instantaneous section, it takes time to identify the faulty area, and as the extraction rate decreases compared to the wide section, there are cases where it takes a long time to recover.

In particular, in a situation where the importance of the safety of the public and power facilities is increasing, the burden of test transmission, which is inevitably carried out in case of failure to detect, is increasing, so instantaneous section reduction is required to improve accuracy and detection rate.

1 is a configuration diagram of a distribution line for explaining a failure recovery method according to the prior art.

If the restoration procedure for the failure occurred in the illustrated distribution line is described in order, ① occurrence of line failure, ② confirmation of DAS failure information (FI), ③ instantaneous execution of the failure section of the distribution line, ④ recovery after confirmation of the failure.

The failure recovery process according to the prior art of this sequence takes a long time to recover in a wide range of instantaneous sections including branch lines and manual switch sections.

Looking at the above problems in detail, it is possible to check the fault section of the distribution line with the fault information (FI) alarm of the automated switch when a fault occurs, but it is not possible to specify the faulty part in detail, and the expensive switch is installed only in the essential part. In addition, there are many branch lines in the line, so the section to be patrolled is wide. For example, it takes about 60 minutes on average to complete transmission of all sections, but the time required for instantaneous completion varies greatly depending on the characteristics of long spans of each line. Accordingly, it takes a long time to identify the faulty area, and the initial response ability is low in the event of an additional accident.

In addition, 18% of 6,245 cases of high-voltage power outage in 2020 were of unexplained failures, and the probability of recurrence of additional failures is high if the cause of failure is not resolved. present) can be found. In this environment, not only power outages due to repeated failures, but also stress on sound equipment and materials increase the risk index of the line in the long term.

Republic of Korea Publication No. 10-2017-0092855: Live wire display device

An object of the present invention is to reduce the instantaneous section of a distribution line and to provide a distribution line failure section indicator for quickly identifying and recovering a failure point.

For reducing the instantaneous section of a power distribution facility failure according to an aspect of the present invention The fault section indicator includes a CT core part constituting a CT that non-contactly detects alternating current flowing through a target line, a display part that is activated by the current detected by the CT and visually displayed to the outside, and a V-shaped cutout and A gripping part having two branches diverging from the incision groove is provided, and a gripping tool capable of gripping the line while wrapping the CT core part inside is formed at the end of the branch, and the incision of the gripping part is formed. A male thread is formed on an outer surface including a lower end of the groove, and the display unit includes a Y-shaped display frame disposed in a lower region of the male thread; and

It is a material through which the visual expression of the display unit passes, and has a thimble shape for protecting the display unit, and may include a cover frame having internal threads formed with female threads that can be coupled to the male threads.

Here, when the cover frame is coupled to the Y-shaped display frame by rotating and fastening the male screw thread and the female screw thread, the V-shaped cutting groove is closed, and the ends of the two branches are closed. The formed holding parts may be circularly engaged with each other to hold the line.

Here, the CT core part may include a first CT core embedded in a holding part formed in one of the two branches; and a second CT core embedded in the holding part formed in the other of the two branches.

Here, when the cover frame is coupled to the Y-shaped display frame, metal surfaces partially exposed at ends of the first CT core and the second CT core may come into contact with each other.

Here, the display unit may include an induction coil that spirally winds the CT core unit; a trigger element that is turned on when the current induced in the induction coil exceeds a predetermined level and maintains a turn-on state; a light emitting element that emits light when the trigger element is turned on; A battery for supplying power to the light emitting device may be included.

Here, the display unit may further include a reset circuit for turning off the trigger element when a predetermined time elapses after the trigger element is turned on.

Here, the display unit may further include a reset operator for turning off the trigger element in a turn-on state according to an operator's manipulation.

Here, the trigger element may be turned on when a current of 500A or 250A flows through the line.

Here, the light emitting element is arranged to emit light at the lowermost end of the display unit, and a circular hole through which light emitted from the light emitting element passes may be formed at the lowermost end of the cover frame.

Here, basic skeletons or outer surfaces of the display frame and the cover frame may be made of a polymer material.

If the distribution line failure section indicator according to the spirit of the present invention having the above configuration is implemented, there is an advantage in that the instantaneous section of the distribution line can be reduced and quick identification and recovery of the failure area are possible.

The distribution line failure section indicator of the present invention has the advantage of reducing safety accidents for the general public, increasing electricity sales, and reducing customer supply disruption damage and civil complaints by installing it in a necessary place in the distribution system.

The distribution line failure section indicator of the present invention is easy to install and remove, and it is easy to identify the failure point with an optical signal that can be confirmed by the patrol person and the general public There is also an advantage.

The distribution line failure section indicator of the present invention has the advantage of reducing additional failures by preventing them in advance by enabling precise patrolling for the increasing number of failures of unknown cause, such as penetration of polymer equipment.

1 is a configuration diagram of a distribution line for explaining a failure recovery method according to the prior art.
Figure 2a is a cross-sectional view showing a display frame constituting a failure section indicator according to the spirit of the present invention.
Figure 2b is a cross-sectional view showing a cover frame constituting a failure section indicator according to the spirit of the present invention.
3a is a conceptual diagram illustrating a case in which a failure section indicator according to the spirit of the present invention is installed on an electric pole.
Figure 3b is a cross-sectional view showing a state in which the failure section indicator according to the spirit of the present invention is coupled to a distribution line such as an electric pole.
4 is a cross-sectional view illustrating functional components of a failure interval indicator according to the spirit of the present invention.

In describing the present invention, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. Terms are only for the purpose of distinguishing one element from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

When a component is referred to as being connected or connected to another component, it may be directly connected or connected to the other component, but it may be understood that another component may exist in the middle. .

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions may include plural expressions unless the context clearly dictates otherwise.

In this specification, the terms include or include are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features or numbers, It can be understood that the presence or addition of steps, operations, components, parts, or combinations thereof is not precluded.

In addition, shapes and sizes of elements in the drawings may be exaggerated for clearer description.

In the present invention, as a countermeasure against a wide instantaneous section related to a failure of a distribution facility that delays identification of a fault location, a phase current detector suitable for trunk lines and branch lines on distribution lines is simple and stable at the midpoint of long-span trunk lines and branch line leads. We propose a failure section indicator for lines such as branch lines to reduce the instantaneous section of distribution facility failure that can be installed with

Depending on the implementation, each phase current detector installed on a number of main lines and branch lines as a failure section indicator turns on the LED when it detects a fault current value for each phase that exceeds the set measurement value (500A for main line: 5A / 250A for branch: 2.5A). It can be manufactured to express “optical signal” through That is, it is possible to reduce manufacturing cost by using a fixed reference value.

Depending on the implementation, through the 2-hour reset function, the optical signal may be automatically turned off when “2 hours” have elapsed since the first signal expression. This 2 hours is taken into account the site conditions assuming an average recovery time of 1 hour starting from normal line operation. Accordingly, the consumption of the built-in battery can be prevented, and the next failure can be restored to a state that can be detected. there is.

Figure 2a is a cross-sectional view showing a display frame constituting a failure section indicator according to the spirit of the present invention.

Figure 2b is a cross-sectional view showing a cover frame constituting a failure section indicator according to the spirit of the present invention.

3A is a conceptual diagram illustrating a case in which a failure section indicator according to the spirit of the present invention is installed on an electric pole.

3B is a cross-sectional view showing a state in which a failure section indicator according to the spirit of the present invention is coupled to a distribution line such as an electric pole.

For reducing the instantaneous section of the distribution facility failure shown The line fault section indicator, such as a branch line, is activated by the CT core parts 101 and 102 constituting the CT that non-contactly detect the alternating current flowing to the target branch line 3 and the current detected by the CT, and visually , and a holding part formed with a V-shaped incision groove and two branches branched off by the incision groove, but at the end of the branch, while wrapping the CT core parts 101 and 102 inside, A gripper capable of gripping the branch line 3 is formed, and a male screw thread 290 is formed on an outer surface including a lower end of the incision groove of the gripper, and the display unit is formed of the male screw thread 290. a Y-shaped display frame 200 disposed in a lower area; and a cover frame 300 made of a material through which the visual expression of the display passes and having a thimble shape for protecting the display, and a female screw thread 390 that can be coupled to the male screw thread 290 formed on an inner surface thereof. there is.

For reducing the instantaneous section of the distribution facility failure shown The failure section indicator is composed of the Y-shaped display frame 200 shown in FIG. 2A and the thimble-shaped cover frame 300 shown in FIG. 2B.

For reducing the instantaneous section of the distribution facility failure shown In order for the failure section indicator to be coupled to the branch line, the male screw thread 290 and the female screw thread 390 are mutually rotated and fastened so that the cover frame 300 is connected to the Y-shaped display frame 200. When combined in a form covering the lower region, the V-shaped cutting groove is closed, and the gripping parts formed at the ends of the two branches are circularly engaged with each other to grip the branch line.

The CT core part of the failure section indicator for reducing the instantaneous section of a power distribution facility failure shown in the drawing includes a first CT core 101 embedded in a holding part formed in one of the two branches; and a second CT core 102 embedded in a holding part formed in the other of the two branches. In another implementation, the CT core part may be formed as a CT core only in the holding part formed on one of the two branches.

Depending on implementation, when the cover frame 300 is coupled to the Y-shaped display frame 200, metal partially exposed at the ends of the first CT core 101 and the second CT core 102 In forming the contact portion of the end of each CT core so that the surfaces come into contact with each other, a part of the metal surface may be exposed during the polymer coating process. This is to smooth the magnetic field/current flow of the CT cores that are circularly coupled when installed on the branch line.

Depending on the implementation, a biasing diode is attached to the watertight space inside the Y-shaped display frame 200 so that it does not operate at a current less than a set current value, and whether the line is abnormal according to the signal of diode 2 in the overcurrent detection process It can be protected from external shock, moisture, and electromagnetic surge by mounting an optical element such as LED that optically expresses, an element that gives a signal to a battery or a predetermined reset device for reset, and a battery as a power supply means.

4 is for reducing the instantaneous section of a failure of a distribution facility according to the spirit of the present invention. It is a cross-sectional view expressing the functional components of the failure section indicator.

The display unit provided in the display frame 200 of the failure section indicator shown in FIG. 4 includes an induction coil 220 that spirally winds the CT core units 101 and 102; a trigger element 240 that turns on when the current induced in the induction coil 200 exceeds a predetermined level and maintains a turn-on state; a light emitting element 260 emitting light when the trigger element 240 is turned on; A battery 280 supplying power to the light emitting device may be included.

Depending on the implementation, the display unit, when a predetermined time (eg, 2 hours) elapses after the trigger element 240 is turned on, the reset circuit 270 for turning off the trigger element 240; and/or a reset operator for turning off the trigger element 240 in a turn-on state according to an operator's manipulation.

By means of the reset circuit 270 and the reset operator, the failure section indicator returns to a state capable of monitoring future failures, and the failure indication signal of the display unit (specifically, the light emitting element) is turned off. .

For example, the trigger element 240 is a three-terminal semiconductor element that can conduct between the anode (A) and the cathode (K) by flowing a current from the gate control terminal (G) to the cathode (K). It can be implemented as a phosphorus thyristor. More specifically, when the induced current generated in the induction coil 220 is applied to the gate control terminal, the anode (A) and the cathode ( K) is conducted, and light emitting display can be performed.

After the circuits of the battery 280 and the light emitting element 260 are turned on, the anode (A) of the thyristor is momentarily grounded (to the battery cathode) by the reset circuit 270 or the reset operator, or , when the circuits of the battery 280 and the light emitting element 260 are momentarily turned off and then turned on, the thyristor is reset to the turned-off state.

Although the structure shown in FIG. 4 is shown for only one of the CT core parts 101 and 102, both CT cores have the same structure, but some of the structures may have an overlapping shape.

For example, in a state in which the induction coil 220 is wound around the first CT core 101 and the second CT core 102, and the induced currents of the two induction coils 220 are combined into one line, It may be applied as a control (trigger) current for the trigger element 240 .

When the trigger element 240 is turned on by the CT formed by the CT core parts 101 and 102 and the induction coil 220, in the case of trunk lines based on the target branch line, the branch line It turns on when 500A flows, and in the case of branching, it can turn on when 250A flows. That is, it is possible to manufacture different branch line failure section indicators for trunk lines and branch lines.

Meanwhile, similar to CTs generally used for line monitoring, the CTs composed of the CT core parts 101 and 102 and the induction coil 220 may be set to a CT ratio of 100:1, as described above. In the case of one branch/trunk current standard, the trigger element 240 may be turned on when 5A flows through the output of the CT for the trunk line, and the trigger element 240 may be turned on when 2.5A flows for the branch line. there is.

As described above, since the current level to be considered as the fault current for the trunk line and the current level to be considered as the fault current for the branch line are standardized, it is necessary to turn on the trigger element 240 for line inspection. A complicated circuit configuration to adjust the CT current level is unnecessary. That is, producing only two types of fault section indicators with fixed turn-on current levels for two standards and applying them to the field is better than producing and applying a fault section indicator equipped with an expensive turn-on current level adjustment circuit, It is excellent in terms of economy, and it is more practical because it can sufficiently secure the ability to detect fault current.

Next, for reducing the instantaneous section of distribution equipment failure according to the spirit of the present invention A specific manufacturing method of the failure section indicator is exemplified.

In the case of the Y-shaped display frame 200 shown in FIG. 2A , for example, the basic skeleton may be made of a polymer, and the externally exposed surface (external surface) may be coated with the polymer. In the case of following this material composition, it becomes easier to inject the basic skeleton according to the wire standard (58 ~ 160 mm2) so that the wire can be secured during production using the flexible characteristics of the polymer. After that, it can be manufactured by coupling parts to the basic injection skeleton, and then extruding the entire outer shape after combining the parts.

In the case of the cover frame 300 shown in FIG. 2B , for example, the basic skeleton may be made of plastic having a higher hardness than elasticity, and the externally exposed surface (external surface) may be coated with a polymer.

When the cover frame 300 manufactured in the above-described manner is coupled in a spirally flowing way in a right rotation with respect to the Y-shaped display frame 200, the Y-shaped display is achieved by the elasticity of the polymer material. As the upper structure of the frame 200 flows into the lower part, the inflow angle of the basic skeleton decreases and is stably attached to the wires of the branch line.

When the cover frame 300 is dismantled (turned left), the upper structure of the Y-shaped display frame 200 is taken out to the upper portion, increasing the inlet angle of the basic skeleton, so that it can be easily detached from the wire.

A circular hole may be formed at the bottom of the cover frame 300 to externally express light emitted from the LED.

Advantages of the above-mentioned polymer material are that the inflow of the internal magnetic field is reduced, it is possible to fix without movement along the wire when attached, secures insulation performance, prevents corrosion of the cover frame 300, and protects the cover frame 300 and Separation after coupling of the Y-shaped display frame 200 can be effectively suppressed.

Those skilled in the art to which the present invention pertains should understand that the embodiments described above are illustrative in all respects and not limiting, since the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. only do The scope of the present invention is indicated by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

101: first CT core 102: second CT core
200: display frame 220: induction coil
240: trigger element 260: light emitting element
270: reset circuit 280: battery
290: male thread 300: cover frame
390: female thread

Claims (10)

A CT core unit constituting a CT that detects AC flowing to a target line in a non-contact manner;
A display unit activated by the current detected by the CT and visually displayed to the outside;
A V-shaped incision groove and a gripping portion formed with two branches branched off by the incision groove,
At the end of the brunch, a gripper capable of holding the line while wrapping the CT core inside is formed, and a male thread is formed on the outer surface including the lower end of the cut groove of the gripper, and the display unit is a Y-shaped display frame disposed in a lower region of the male thread; and
A material through which the visual expression of the display passes, having a thimble shape to protect the display, and a cover frame having internal threads formed with female threads that can be combined with the male threads.
For reducing the instantaneous section of distribution facility failure including fault zone indicator.
According to claim 1,
When the cover frame is coupled to the Y-shaped display frame by rotating and fastening the male thread and the female thread, the V-shaped incision is closed and the waves formed at the ends of the two branches are closed. A failure section indicator in which the branches are circularly engaged with each other to hold the line.
According to claim 1,
The CT core part,
a first CT core embedded in a holding part formed on one of the two branches; and
The second CT core embedded in the holding part formed in the other of the two branches
Failure section indicator including a.
According to claim 3,
When the cover frame is coupled to the Y-shaped display frame, metal surfaces partially exposed at ends of the first CT core and the second CT core come into contact with each other.
According to claim 1,
the display unit,
an induction coil spirally winding the CT core;
a trigger element that is turned on when the current induced in the induction coil exceeds a predetermined level and maintains a turn-on state;
a light emitting element that emits light when the trigger element is turned on;
A battery that supplies power to the light emitting element
Failure section indicator including a.
According to claim 5,
the display unit,
A reset circuit for turning off the trigger element when a predetermined time elapses after the trigger element is turned on
A failure section indicator further comprising a.
According to claim 5,
the display unit,
A reset operator that turns off the trigger element in the turned-on state according to the operator's manipulation
A failure section indicator further comprising a.
According to claim 5,
The trigger element,
A failure section indicator that turns on when a current of 500A or 250A flows through the line.
According to claim 5,
The light emitting element,
It is arranged to emit light at the bottom of the display unit,
A failure section indicator having a circle hole through which the light emitted from the light emitting element passes is formed at the lowermost end of the cover frame.
According to claim 1,
A basic skeleton or outer surface of the display frame and the cover frame is made of a polymer material.

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