KR20220001945A - Intelligent switchgear device and reclosing method ofthere - Google Patents

Abstract

An intelligent switchgear device of the present invention includes: an ammeter which measures a current in a power path; an anemometer which measures wind speed in an installed area; an opening/closing element which is opened or input, to block or connect the power path; and a controller which opens the opening/closing element when it is determined that a fault current occurs, performs reclosing inspection to check a reclosing condition, and determines the number of repetitions of the reclosing inspection according to the wind speed value measured by the anemometer.

Description

INTELLIGENT SWITCHGEAR DEVICE AND RECLOSING METHOD OFTHERE

The present invention relates to an intelligent switch device capable of preventing the occurrence of a fire caused by a switch operation, and a method for reclosing the intelligent switch.

In Korea, about 70% of the land is forest, and recently, forest fires occur frequently due to the influence of many hikers or natural fire caused by dry weather. In particular, if a forest fire occurs when a strong wind blows, it is difficult to extinguish, and it tends to easily spread to the neighboring mountains due to the nature of the mountainous terrain of Korea. Most of the cases are detected after they have already been enlarged, so many forests are damaged or lost due to these fires.

Therefore, each local government spends a lot of manpower and money to control and manage the climbers' entry into the mountain and to conduct forest fire prevention activities or to monitor forest fires through aerial observation, etc. Because of this input, problems such as excessive work due to the need for manpower and a decrease in work efficiency are caused.

However, forest fires are not only caused by spontaneous ignition or carelessness of hikers, but recently, there have been reports of cases occurring also by sparks from switchgear constituting power facilities passing through mountainous areas.

6 is a photograph showing a utility pole-installed switchgear that has been pointed out as a cause of the recent wildfire.

The fire caused by switchgear is due to the fact that, when the switchgear is old, when performing the reclosing function, a spark is generated larger than that of new equipment, and the number of retries increases according to the failure of individual input/opening.

As a measure realistically performed to prevent fire caused by the above-described power switch, set in advance (regulation) in manually operating the RA (Recloser Automatic) reclosing function in the mountainous section when a strong wind advisory with a high probability of a forest fire accident takes effect. It is only a differential operation by receiving an instruction to change the number of cut-offs according to the standard, and manually operating it according to the received content at the distribution center.

Table 1 below illustrates the blocking frequency change instruction in table form.

The above table is only a kind of temporary operation plan, and this temporary operation plan increases the burden on the operator because there are many problems with the operation target RA, such as many days of strong winds throughout the year and the number of differential operation target RAs nationwide.

In addition, in terms of effectiveness, there is a problem that it takes time to immediately reflect the RA in case of strong winds. In particular, it is difficult to accurately predict the weather in mountainous areas due to the influence of the topography, so it is difficult to immediately reflect the changing weather in the RA, so the golden time for differential driving (operation timing) may be missed.

Also, looking at the process of applying the table, a time delay occurs due to a series of interpersonal tasks in which the person in charge of the power company checks the weather or weather forecast, instructs the distribution center, and performs the operation.

In addition, there is a significant risk of human error, which can cause wildfires due to omission of differential driving equipment.

Korean Patent Publication No. 1996-0013533

An object of the present invention is to propose an intelligent switchgear device and a reclosing method of an intelligent switchgear capable of directly designating a suitable number of repetitions of a reclosing check according to a change in weather such as wind speed.

An intelligent switchgear device according to an aspect of the present invention includes: an ammeter for measuring a current in a power path; Anemometer to measure wind speed in the installed area; an opening/closing element that is opened or input to block or connect the power path; and a controller configured to open the switching element upon determining the occurrence of an accidental current and perform a reclosing check to confirm a reclosing condition, and to determine the number of repetitions of the reclosing check according to the wind speed value measured by the anemometer. can

Here, the controller may determine the number of repetitions of the reclosing check according to the measured wind speed value and a place where the intelligent switchgear device is installed.

Here, further comprising a hygrometer for measuring the humidity of the installed area,

The controller may determine the number of repetitions of the reclosing check according to the wind speed value measured by the anemometer and the humidity value measured by the hygrometer.

Here, the method may further include a communication module for transmitting the reclosing path check result or information on the completion of the opening/closing path for the reclosing device to an external distribution center server.

Here, the controller may receive, from the external distribution center server, the measured wind speed value and the table for the number of repetitions of the reclosing inspection allowed for the installation location, and store it in the internal storage space.

Here, when the number of repetitions of the reclosing check is 0 according to the wind speed value measured by the anemometer, the controller may repeat the measurement of the wind speed value.

An intelligent switchgear reclosing method according to an aspect of the present invention includes: monitoring a current in a power path; blocking the power path by opening an opening/closing element when an abnormality occurs in the current to be monitored; determining whether to perform a reclosing check; acquiring a wind speed value when it is decided to perform a reclosing check; determining the number of repetitions of reclosing inspection from the acquired wind speed value; temporarily closing the opening/closing element by the determined number of repetitions, and confirming whether a reclosing condition is satisfied; if the reclosing condition is satisfied, completing a reclosing of routinely closing the opening and closing elements; and determining a reclosing failure when the reclosing condition is not satisfied by the determined number of repetitions.

Here, the method may further include transmitting the information determined as the reclosing failure to an external distribution center.

Here, in the determining of the number of repetitions of the reclosing inspection, the number of repetitions of the reclosing inspection may be determined from the acquired humidity value and the installation location of the opening and closing element.

Here, the method further comprises the step of acquiring a humidity value when it is determined to perform the reclosing check, and in the determining the number of repetitions of the reclosing check, repeating the reclosing check from the obtained humidity value and the wind speed value You can decide the number of times.

Here, if the number of repetitions determined in the step of determining the number of repetitions of the reclosing check is 0, the steps of acquiring the wind speed value and determining the number of repetitions of the reclosing check are performed by repeating once more may include

If the intelligent switch device and/or the intelligent switch reclosing method according to the spirit of the present invention having the above-described configuration are implemented, there is an advantage in that it is possible to apply the appropriate number of repetitions of the reclosing check according to the weather change such as wind speed.

The intelligent switchgear device and/or the intelligent switchgear reclosing method of the present invention has an advantage in that it is possible to prevent large-scale wildfires caused by the switchgear at a time when wildfires occur frequently.

The intelligent switchgear device and/or the intelligent switchgear reclosing method of the present invention has the advantage of shortening the response time when the switchgear is opened and preventing human error due to omission of operation.

1 is a block diagram illustrating an intelligent switchgear device according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating an embodiment of an intelligent switchgear reclosing method performed in the intelligent switchgear device of FIG. 1 .
3 is a flowchart illustrating another embodiment of the intelligent switchgear reclosing method performed in the intelligent switchgear device of FIG. 1 .
4 is a block diagram illustrating an intelligent switchgear device according to another embodiment of the present invention.
5 is a flowchart illustrating an embodiment of an intelligent switchgear reclosing method performed in the intelligent switchgear device of FIG. 4 .
6 is a photograph showing a utility pole installation type switchgear that has been pointed out as the cause of the recent wildfire.

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

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 can be understood that other components may exist in between. .

The terminology used herein is used only to describe specific embodiments, and is not intended to limit the present invention. The singular expression may include the plural expression unless the context clearly dictates otherwise.

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

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

In the present invention, an anemometer that can measure the wind speed of the relevant site is mounted on the RA installed at a point easily affected by wind, such as a power pole installed in a mountainous area, and automatically with the number of repetitions of the reclosing check set according to the wind speed when a strong wind occurs. , proposes a way to perform the action by re-defeat. For example, depending on the wind speed and location, it is possible to automatically determine the number of repetitions of the inspection from 3 to 0 times, and the RA can measure the on-site wind speed and automatically check the reclosing and perform adjustment and reduction according to the set number of cutoffs.

1 is a block diagram illustrating an intelligent switchgear device according to an embodiment of the present invention.

The illustrated intelligent switchgear device 100 includes an ammeter 120 for measuring the current in the power path; An anemometer 170 for measuring wind speed in the installed area; an opening/closing element 110 that is opened or input to block or connect the power path; And when it is determined that the fault current occurs, the opening/closing element 110 is opened and a reclosing check is performed to check the reclosing condition, but the number of repetitions of the reclosing check is performed according to the wind speed value measured by the anemometer 170. It may include a controller 140 to determine.

Although the standard for the number of repetitions of the reclosing inspection according to Table 1 described above is a temporary operation plan for manual operation, it can be considered that it has presented an appropriate standard for preventing the risk of fire due to strong winds in mountainous terrain. Therefore, the criteria according to Table 1 can also be applied to the automatic operation of the intelligent switchgear of the present invention.

In this case, the controller 140 may determine the number of repetitions of the reclosing check according to the measured wind speed value and the place where the intelligent switchgear device is installed, and an internal storage space such as an internal register or buffer of the controller 140 . Reference information as shown in Table 1 may be stored in the .

The ammeter 120 and the switching element 110 may be substantially the same as in the case of a general RA switch. For example, the switching element 110 may be implemented as a mechanical switch for closing/opening a high current power transmission path, and the ammeter 120 may be implemented as a CT that measures a current flowing through the power transmission path.

The anemometer 170 is attached to the enclosure of the switchgear device as shown in the photo of FIG. 6 , and may be implemented as a wind power measuring means capable of measuring the wind speed of the wind in a direction parallel to the ground. For example, the anemometer 170 may be implemented in a shape similar to a traditional anemometer for weather observation (a shape of a pinwheel rotating in the direction of gravity or a shape of a wind direction anemometer similar to a propeller plane). For example, two or three unit fixed wind speed measuring devices of a method of forming a fixed wind passage in a cylindrical or box shape and obtaining the speed of a propeller installed inside the passage are provided in two or three directions orthogonal to each other, and two or three unit fixed wind speed The wind speed value can be obtained by combining the measured values of the measuring device.

Although not shown, the intelligent switchgear device 100 may further include an operator interface that receives an instruction or manipulation input from an operator and visually (or audibly) outputs an internal state similarly to a general switchgear device.

Even if the input means for the opening/closing element 110 is instructed by the input means of the operator interface, when the reclosing condition is not satisfied by the control of the controller or the number of repetitions of the reclosing check is exceeded, the input It can be opened immediately even if it is not or is put in.

In addition, the number of repetitions of the reclosing check, the number of repetitions of the remaining reclosing checks, completion of reclosing, failure of reclosing, causes of reclosing failure, etc. may be notified to the operator through the output means of the operator interface.

FIG. 2 is a flowchart illustrating an embodiment of an intelligent switchgear reclosing method performed in the intelligent switchgear device of FIG. 1 .

The illustrated intelligent switchgear reclosing method includes the steps of monitoring a current in a power path (S20); When an abnormality occurs in the current to be monitored (S40), opening the switching element to block the power path (S60); determining whether to perform a reclosing check (S110); acquiring a wind speed value when it is decided to perform a reclosing check (S120); determining the number of repetitions of reclosing inspection from the acquired wind speed value (S130); Checking whether the reclosing condition is satisfied, such as temporarily closing the switching element for the determined number of repetitions, and checking whether there is an abnormality in the current in the power path (S160); if the reclosing condition is satisfied, completing the reclosing of routinely closing the opening and closing element (S180); and if the reclosing condition is not satisfied by the determined number of repetitions, determining a reclosing failure ( S190 ).

In the step of determining the number of repetitions of the reclosing check (S130), if a criterion similar to Table 1 is applied, the number of repetitions of the reclosing check is determined from the obtained humidity value and the installation location of the opening and closing element .

Monitoring the current of the power path (S20) and blocking the power path (S40) may be a general operation process of a circuit breaker/switcher for protecting power equipment and system load.

When a large current flows in the power path due to a temporary ground fault or the like in the power path, the step (S60) of blocking the power path is performed. After a predetermined time), it means to temporarily close the switch again to check whether the current flows within the reference value range.

For example, the step of determining whether to perform the reclosing check ( S110 ) may be performed in a manner of confirming that a predetermined time has elapsed after the power path is cut off.

As shown in FIG. 1 , when the power path is monitored with the CT, the step of monitoring the current of the power path ( S20 ) is performed in such a way that it is checked whether the current value measured at the CT exceeds a reference upper limit value, S160 . The reclosing condition of the step may be performed in such a way that it is confirmed whether the current value measured by the CT is within the reference upper limit value. In the case of an implementation that verifies the error of the switching element itself, it may also be checked whether the current value measured by the CT is equal to or greater than the reference lower limit.

As a result of the above-described one-time closing reclosing check, if the current flows out of the reference value range or the switch closing operation is not complete, the switch is opened and the reclosing check is performed again after a short delay time. In this way, the reclosing checks of temporarily closing the switchgear are performed for a predetermined number of times in this way, but if it is confirmed that the current flows within the reference value range on the way, it is determined that the cause of the accident has been removed in the power path, and finally the switch is put into closing maintain (S180).

On the other hand, if the current flows out of the reference value range or the switch closing operation is not complete even after performing the reclosing checks of temporarily closing the switch a predetermined number of times, an accident that requires a physical (offline) action in the corresponding power path occurs to be determined (S190), the corresponding switch may be kept open, and this may be notified to the manager by a warning lamp, display, sound, or the like, or transmitted to a higher-level server (distribution center server).

3 is a flowchart illustrating another embodiment of the intelligent switchgear reclosing method performed in the intelligent switchgear device of FIG. 1 .

In the illustrated intelligent switchgear reclosing method, after determining the number of repetitions of the reclosing check from the acquired wind speed value (S131), if the determined number of repetitions of the reclosing check is 0, once again the number of repetitions of the reclosing check is Check the determining conditions (wind speed in the drawing). That is, obtaining a wind speed value (S152); and determining the number of repetitions of the reclosing check from the acquired wind speed value ( S153 ) once more, there is a difference from the flowchart of FIG. 2 .

This means that if the number of repetitions of the reclosing check in step S131 is 0, it is considered an accident that requires a physical (offline) action on the power path immediately. This is in consideration of the possibility of an extremely instantaneous increase in the wind speed value due to a temporary error in the wind speed value due to a surge, etc. or an extremely temporary strong wind such as a tornado.

Although it is a short time interval, by measuring the wind speed value twice, it is possible to suppress unnecessary physical (offline) measures being performed due to the above circumstances.

Processes after measuring the wind speed twice as described above are almost the same as those of the flowchart of FIG. 2 , so a redundant description will be omitted.

4 is a block diagram illustrating an intelligent switchgear device according to another embodiment of the present invention.

The illustrated intelligent switchgear device includes an ammeter 120 for measuring the current in the power path; An anemometer 170 for measuring wind speed in the installed area; an opening/closing element 110 that is opened or input to block or connect the power path; Hygrometer 175 for measuring the humidity of the installed area; When it is determined that the fault current occurs, the opening/closing element 110 is opened and a reclosing check is performed to check the reclosing condition, but the wind speed value measured by the anemometer 170 and the humidity value measured by the hygrometer 175 are performed. a controller 140 that determines the number of repetitions of the reclosing check according to and a communication module 180 for transmitting the reclosing check result or information on the completion of the opening/closing path for the reclosing device to an external distribution center server.

In determining the number of repetitions of the reclosing check, the controller 140 applies not only the wind speed value but also the humidity value measured by the hygrometer, which is fundamentally different from the case of FIG. 1 .

In addition, depending on the implementation, the controller 140 may receive, from the external distribution center server, the measured wind speed value and the table for the number of repetitions of the reclosing check allowed for the installation location, and store it in the internal storage space. have.

According to the implementation, the controller 140, similarly to the case of the flowchart of FIG. 3 , if the number of repetitions of the reclosing check is 0 according to the wind speed value and the humidity value measured by the anemometer 170, the wind speed value and/or the measurement of the humidity value and the determination of the number of repetitions of the reclosing check may be repeated once.

5 is a flowchart illustrating an embodiment of an intelligent switchgear reclosing method performed in the intelligent switchgear device of FIG. 4 .

In the illustrated intelligent switchgear reclosing method, if the reclosing condition is not satisfied by the determined number of repetitions, that is, in the case of a reclosing failure, transmitting the information determined as the reclosing failure to an external distribution center ( In performing S200), there is a difference from the reclosing method according to the flowchart of FIG. 2 .

This is reflected in the reclosing method that the intelligent switchgear device itself has a communication module 200 capable of communicating with an external distribution center as shown in FIG. 4 .

In addition, the illustrated intelligent switchgear reclosing method includes, when determining whether to perform the reclosing check, acquiring a wind speed value and a humidity value when the reclosing check is determined (S122); and determining the number of repetitions of the reclosing check from the acquired wind speed value and the humidity value ( S132 ), there is a difference from the reclosing method according to the flowchart of FIG. 2 .

This is reflected in the reclosing method that the intelligent switchgear device itself is provided with a hygrometer 175 for measuring the humidity of the installed area, as shown in FIG. 4 .

Processes except for the two differences described above are almost the same as those of the flowchart of FIG. 2 , and thus redundant descriptions will be omitted.

Those skilled in the art to which the present invention pertains should understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics thereof, so the embodiments described above are illustrative in all respects and not restrictive. 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. .

110: switching element
120: ammeter
140: controller
170: anemometer
175: hygrometer
180: communication module

Claims (11)

an ammeter that measures the current in the power path;
Anemometer to measure wind speed in the installed area;
an opening/closing element that is opened or input to block or connect the power path; and
A controller that opens the opening/closing element when it is determined that an accidental current has occurred and performs a reclosing check to check the reclosing condition, and determines the number of repetitions of the reclosing check according to the wind speed value measured by the anemometer
An intelligent switchgear device comprising a.
The method of claim 1,
The controller is
An intelligent switchgear device that determines the number of repetitions of the reclosing check according to the measured wind speed value and a place where the intelligent switchgear device is installed.
According to claim 1,
Hygrometer to measure the humidity of the installed area
further comprising,
The controller is an intelligent switchgear device that determines the number of repetitions of the reclosing check according to the wind speed value measured by the anemometer and the humidity value measured by the hygrometer.
According to claim 1,
A communication module for transmitting the reclosing path check result or information on the completion of the opening/closing path for the reclosing device to an external distribution center server
Intelligent switchgear device further comprising a.
5. The method of claim 4,
The controller is
An intelligent switchgear device for receiving, from the external distribution center server, the measured wind speed value and a table for the number of repetitions of the reclosing inspection allowed for the installation location, and storing it in the internal storage space.
According to claim 1,
The controller is
If the number of repetitions of the reclosing check is 0 according to the wind speed value measured by the anemometer, the intelligent switchgear device repeats the measurement of the wind speed value.
monitoring the current in the power path;
blocking the power path by opening an opening/closing element when an abnormality occurs in the current to be monitored;
determining whether to perform a reclosing check;
acquiring a wind speed value when it is decided to perform a reclosing check;
determining the number of repetitions of reclosing inspection from the acquired wind speed value;
temporarily closing the opening/closing element by the determined number of repetitions, and confirming whether a reclosing condition is satisfied;
if the reclosing condition is satisfied, completing a reclosing of routinely closing the opening and closing elements; and
determining a reclosing failure if the reclosing condition is not satisfied by the determined number of repetitions
An intelligent switchgear reclosing method comprising a.
8. The method of claim 7,
Transmitting the information determined as the reclosing failure to an external distribution center
An intelligent switchgear reclosing method further comprising a.
8. The method of claim 7,
In the step of determining the number of repetitions of the reclosing inspection, the intelligent switchgear reclosing method of determining the number of repetitions of the reclosing inspection from the acquired humidity value and the installation location of the opening and closing element.
8. The method of claim 7,
Step of acquiring the humidity value when it is decided to perform the reclosing inspection
further comprising,
In the step of determining the number of repetitions of the reclosing inspection, the intelligent switchgear reclosing method of determining the number of repetitions of the reclosing inspection from the obtained humidity value and the wind speed value.
8. The method of claim 7,
If the number of repetitions determined in the step of determining the number of repetitions of the reclosing check is 0,
Repeatingly performing the steps of acquiring the wind speed value and determining the number of repetitions of the reclosing check
An intelligent switchgear reclosing method further comprising a.

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