KR20230156591A - Power facility measurement phase verification device and method - Google Patents

Abstract

The power facility measurement phase verification device of the present invention includes an inspection facility designation unit that specifies a power facility that is the target of phase measurement; a measurement specification information acquisition unit that acquires specification information of a sensing device used to measure the phase of the power facility; a measurement value input unit that receives the phase value measured by the sensing device; a facility database that stores specifications and grid connection structure information of the power facility; And it may include a phase verification unit that verifies the phase value input from the measured value input unit according to the specifications and grid connection structure information of the power equipment and the specification information of the sensing device used to measure the phase of the power equipment.

Description

Power equipment measurement phase verification device and method {POWER FACILITY MEASUREMENT PHASE VERIFICATION DEVICE AND METHOD}

The present invention relates to a mobile phase verification device for measuring the actual load of power facilities, which is a type of portable inspection device installed by an inspector of power facilities in the form of an application on his or her smartphone.

In the power system, power is supplied at high voltage/large current except for the distribution line at the end of the consumer side. Since it is realistically impossible to measure the high voltage/large current line directly, it is measured by converting it to low voltage/low current on the secondary side.

The equipment that measures this way is called a transformer, and is divided into a current transformer (CT, Current Transformer) that measures current, and a transformer (Power Transformer) that measures voltage. The values converted secondarily by the transformer are used in protective relays, etc. to protect equipment.

A protective relay is a relay whose purpose is to receive the secondary value of a transformer installed in a transmission line, transformer, or circuit breaker, detect and operate an equipment abnormal condition, reduce damage to the relevant equipment, and give an appropriate command to prevent its spread. It is it. The system test part tests insulation resistance, polarity test, transformation ratio, and saturation characteristics to verify the performance of the transformer. During the actual load test before the power equipment is fed into the system, a phase angle meter is used to check the secondary value of the transformer in the protection relay. Finally, check whether the input is correct.

Table 1 below illustrates actual load phase measurements in a 154kV transformer protection panel.

The actual load phase measurement value varies depending on site conditions (CT ratio, facility type), and if the tester misjudges the final verification, the relay malfunctions and the power facility is stopped. There was also a case where the transformer stopped in normal condition due to a judgment error as a result of the actual load phase measurement after replacing the secondary circuit breaker of a 154kV transformer.

Republic of Korea Publication No. 10-1995-0003318

A power facility measurement phase verification device according to an aspect of the present invention includes an inspection facility designation unit that specifies a power facility that is the target of phase measurement; a measurement specification information acquisition unit that acquires specification information of a sensing device used to measure the phase of the power facility; a measurement value input unit that receives the phase value measured by the sensing device; a facility database that stores specifications and grid connection structure information of the power facility; And it may include a phase verification unit that verifies the phase value input from the measured value input unit according to the specifications and grid connection structure information of the power equipment and the specification information of the sensing device used to measure the phase of the power equipment.

Here, it may further include an output unit that outputs a phase verification result for the power facility performed by the phase verification unit.

Here, the power facility measurement phase verification device is a mobile application installed on a smartphone, and the inspection facility designation unit and the measurement value input unit may be a SW module that receives user input using the UI of the smartphone.

Here, the measurement specification information acquisition unit queries the information on the equipment designated by the inspection equipment designation unit, reads the CT ratio of the CT mounted on the designated equipment, and outputs this on the smartphone screen to obtain the CT read from the user. You can receive confirmation of the rain value.

Here, it may further include a size verification unit that verifies the size value measured by the sensing device according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility. .

Here, the measured value input unit receives a magnitude value along with the phase value measured by the sensing device, and the phase verification unit performs verification of the phase value when the magnitude verification unit determines that the magnitude value is in the normal range. can do.

A power facility measurement phase verification method according to another aspect of the present invention includes the steps of designating a power facility to be the target of phase measurement according to a user input; Obtaining specification information of a sensing device used to measure the phase of the power facility from a facility database that stores specifications and grid connection structure information of the power facility; Receiving a phase value measured by the sensing device; And it may include verifying the input phase value according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility.

Here, the step of outputting a phase verification result for the power facility may be further included.

Here, receiving a size value measured by the sensing device; And it may further include verifying the size value according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility.

Here, the power facility measurement phase verification method is performed by an application on a smartphone, and the step of specifying the power facility includes outputting a candidate list of target facilities to the screen according to the location information identified by the smartphone, and selecting the candidate. This can be done by having the user select from a list.

Here, the step of acquiring the specification information of the sensing device is to query the information of the power facility that is the subject of inspection, read the CT ratio of the CT mounted on the power facility, and output it on the screen to display the CT ratio value read from the user. This can be done to obtain confirmation.

If the mobile verification device for measuring the actual load phase of power equipment according to the spirit of the present invention of the above-described configuration is implemented, there is an advantage in preventing facility power outages or breakdowns due to erroneous operation of the protection relay due to erroneous judgment of the actual load phase test.

The mobile device for verifying actual load phase measurement of power equipment of the present invention has the advantage of providing an environment in which workers can easily adapt to work by being used at test sites in the form of a mobile app with a familiar interface.

1 is a block diagram showing an embodiment of a power equipment measurement phase verification device according to the spirit of the present invention.
Figure 2a is the initial screen when running the power equipment measurement phase verification device mobile app.
Figure 2b is a screen for specifying a target inspection facility and receiving CT specification information (e.g. CT ratio) as a sensing device mounted on the facility.
Figure 3a is a measurement value input screen where the user can input the measurement values of the sensing device mounted on the confirmed facility.
Figure 3b is an output screen showing the results of phase verification of the target inspection equipment according to the spirit of the present invention.
Figure 4 is a CT wiring diagram in a 154kV transformer protection panel.
Figure 5 is a CT wiring diagram in a 154kV transmission line protection panel.
Figure 5 is a CT wiring diagram in a 154kV transmission line protection panel.
Figure 6 is a CT wiring diagram in a 345kV transformer protection panel.
Figure 7 is a CT wiring diagram in a 345kV transmission line protection panel.
FIG. 8 is a flowchart illustrating an embodiment of a power facility measurement phase verification method performed in the power facility measurement phase verification device of FIG. 1.

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 intended only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may be referred to as a first component without departing from the scope of the present invention.

When a component is mentioned as being connected or connected to another component, it can be understood that it may be directly connected to or connected to the other component, but other components may exist in between. .

The terms used herein are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions, unless the context clearly indicates otherwise.

In this specification, terms such as include or have are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, including one or more other features or numbers, It can be understood that the existence or addition possibility of steps, operations, components, parts, or combinations thereof is not excluded in advance.

Additionally, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

In the present invention, we would like to present a mobile verification device for measuring the actual load phase of power equipment in the form of a mobile app that finally verifies the values measured at the actual load.

For example, select the protection relay to be measured (transmission line, transformer, bus bar, etc.), enter the corresponding correction CT ratio, and enter the measured value. The app calculates the value and phases, determines whether the measured value is normal, and reports the result. It can be implemented by saving a PDF file.

Figure 1 is a block diagram showing an embodiment of a power equipment measurement phase verification device according to the spirit of the present invention.

The illustrated power facility measurement phase verification device includes an inspection facility designator 120 that specifies a power facility to be measured according to a user input; A measurement specification information acquisition unit 140 that acquires specification information of a sensing device used to measure the phase of the power facility; a measurement value input unit 160 that receives the phase value measured by the sensing device; A facility database 130 that stores specifications and grid connection structure information of the power facility; And a phase verification unit 180 that verifies the phase value input from the measured value input unit 160 according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility. ) may include.

In addition, it may further include an output unit 190 that outputs a phase verification result for the power facility performed by the phase verification unit 180.

The power equipment measurement phase verification device may be implemented in the form of a mobile application installed on the worker's smartphone, and the user is then the user of the smartphone. In this case, the inspection equipment designator 120 and the measurement value input unit 160 may be implemented in the form of a SW module that receives user input using the UI (eg, touch screen) of a smartphone.

The measurement specification information acquisition unit 140 determines the specifications of the sensing device attached to the inspection equipment from the result of a search for the equipment database for the power equipment designated by the inspection equipment designation unit 120 and/or the user's input. Information can be obtained. Alternatively, as an example of applying both of the above-described methods, information (e.g., serial number, ID, etc.) of the equipment designated by the inspection equipment designation unit 120 is stored in the equipment database 130 or the equipment management server. By querying, the CT ratio of the CT mounted on the designated equipment can be read, printed on the smartphone screen, and confirmation of the read CT ratio value can be received from the user (e.g., Figure 2b below). This has the advantage of supporting accurate judgment even after the CT is replaced and before it is reflected in the DB of the facility management server.

The measured value input unit 160 is a method in which the user inputs the current value and phase value measured by the CT as a measured value read with the naked eye using a smartphone on which the power equipment measurement phase verification device mobile app is installed. It can be implemented as:

In another somewhat complicated implementation, the measurement value input unit allows the user to photograph the output display of the corresponding CT with a smartphone on which the power equipment measurement phase verification device mobile app is installed, analyze the image of the photographed image, and perform an image analysis on the current measured in the CT. It can also be operated by reading value and phase value.

The inspection equipment designation unit 120 manually receives information (e.g., serial number or ID, etc.) of power equipment subject to inspection according to the user's operation of the smartphone, or selects the information from a list (e.g., Figure 2a below). It can be implemented in a way that is selected (designated).

In another somewhat complicated implementation, the inspection equipment designation unit outputs a candidate list of target equipment according to the location information identified by the user's smartphone, and may be operated in such a way that usage data is selected (designated) from the candidate list. .

The equipment database 130 is implemented in the form of a data block downloaded from a power equipment management server, etc. and stored in a smartphone, or is implemented in the form of a SW module that queries data on a separate power equipment management server, etc., or is implemented in the form of a separate power equipment management server. By querying servers, etc., some candidate data can be downloaded in advance from the total data and implemented in the form of data blocks stored on the smartphone.

The phase verification unit 180 can apply various phase check algorithms according to the location and specifications of each power facility and/or sensing device on the power distribution network to check whether the measured phase is in the normal range.

Depending on the implementation, the size of the measurement value input from the measurement value input unit 160 is verified according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility. A size verification unit 170 may be further included. In this case, the measurement value input unit 160 receives the magnitude value as well as the phase value measured by the sensing device.

The verification result of the size verification unit 170 is intended to verify accidents other than phase diagnosis, such as overcurrent or ground fault, but in reality, in this case, the protection relay operates, so it is essential to implement the idea of the present invention. no. However, in the case of phase diagnosis according to the spirit of the present invention, if the size of the measured value is within the normal range, it may be reflected in the way that the phase verification unit 180 performs phase diagnosis.

Each algorithm that can be applied in the phase verification unit 180 and/or the size verification unit 170 according to specifications such as location or capacity on the distribution network of the target power distribution will be described later.

Figure 2a illustrates the initial screen when running the power equipment measurement phase verification device mobile app.

Figure 2b illustrates a screen for specifying a target inspection facility and then receiving specification information (e.g., CT ratio) of the CT as a sensing device mounted on the facility.

For example, when the user runs the power facility measurement phase verification device mobile app, the initial screen as shown in FIG. 2A lists a list 21 of protection switchgear facilities on the local distribution network that can be target inspection facilities. The region shown on the screen is Gyeongbuk, and the region can be automatically set using smartphone GPS location information, or can be set as the region in charge of the department according to the user's (inspector's) affiliation input when setting up the app.

If a specific protection switchboard is designated as the target facility in the screen of Figure 2a, a screen is displayed to check the CT ratio of the CT mounted on the corresponding protection switchboard, and the transformer and CT wiring diagram for the site where the corresponding protection switchboard is installed as shown in Figure 2b. can be displayed together.

The screen in FIG. 2b shows the transformer and CT wiring structure for the site, as well as the location and CT ratio of each CT. If the CT ratio displayed on the screen in Figure 2b matches what the user confirms or is familiar with, the user touches the 'Measurement Value Input' control (26) on the screen to enter the next process, and if it does not match, the user enters the next process. You can touch the 'Change CT ratio' control (27) to correct.

Figure 3a illustrates a measurement value input screen where the user can input the measurement value of the sensing device installed in the confirmed facility.

Figure 3b illustrates an output screen showing the results of phase verification of the target inspection equipment according to the spirit of the present invention.

When the 'Measurement Value Input' control 26 is touched on the screen of FIG. 2B, the measurement value input screen of FIG. 3A can be displayed on the smartphone. In the screen of FIG. 3A, items 31 for inputting size and phase values read by the user from CTs installed in each of the three phases, such as A, B, and C, and in the N phase, may be displayed.

In the screen of FIG. 3B, it is indicated (36) that the phase verification results for the phase values measured from CTs in the distribution system according to the transformer and CT wiring structure of the target site shown in the screen of FIG. 2B are good.

Next, we will illustrate the phase measurement value verification judgment conditions for each power facility that can be reflected in each phase check algorithm that can be applied depending on the location and specifications of each power facility and/or sensing device.

Figure 4 illustrates CT wiring in a 154kV transformer protection panel.

For the 154kV transformer protection panel having the CT wiring structure as shown in FIG. 4, for example, the size determination conditions and phase determination conditions shown in Table 2 below can be applied.

For example, the size verification unit 170 of FIG. 1 determines that the measured size values are verified if all of the size determination conditions in Table 2 are satisfied, and the phase verification unit 180 satisfies all of the phase determination conditions of Table 2. If so, it can be determined that the measured phase values have been verified.

Figure 5 illustrates CT wiring in a 154kV transmission line protection panel.

For the 154kV transmission line protection panel having the CT wiring structure as shown in FIG. 5, for example, the size and phase determination conditions shown in Table 3 below can be applied.

Meanwhile, for the 154kV busbar protection panel, for example, the size and phase judgment conditions shown in Table 4 below can be applied.

Figure 6 illustrates CT wiring in a 345kV transformer protection panel.

For the 345kV transformer protection panel having the CT wiring structure as shown in FIG. 6, for example, the size and phase determination conditions shown in Table 5 below can be applied.

Figure 7 illustrates CT wiring in a 345kV transmission line protection panel.

For the 345kV transmission line protection panel having the CT wiring structure as shown in FIG. 7, for example, the size determination conditions and phase determination conditions shown in Table 6 below can be applied.

Regarding Tables 3 to 6 above, for example, the size verification unit 170 of FIG. 1 determines that the measured size values are verified if all the size determination conditions of the table are satisfied, and the phase verification unit 180 determines the phase of the table. If all judgment conditions are satisfied, it can be determined that the measured phase values have been verified.

FIG. 8 is a flowchart illustrating an embodiment of a power facility measurement phase verification method performed in the power facility measurement phase verification device of FIG. 1.

The illustrated power facility measurement phase verification method includes the step of specifying a power facility that is the target of phase measurement according to a user input (S120); Obtaining specification information of a sensing device used to measure the phase of the power facility from a facility database that stores the specifications and grid connection structure information of the power facility (S140); Receiving the phase value measured by the sensing device (S160); Verifying the input phase value according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility (S180); And it may include a step of outputting a phase verification result for the power facility (S190).

Depending on the implementation, receiving a size value measured by the sensing device (S150); And it may further include verifying the size value according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility.

The power equipment measurement phase verification method according to the illustrated flowchart can be executed by an application on the user's smartphone.

In this case, for example, the step of specifying the power facility (S120) is to output a candidate list of target facilities on the screen according to the location information identified by the smartphone, and receive selection from the user from the candidate list using a touch screen, etc. It can be performed as:

Likewise, for example, in the step of acquiring specification information of the sensing device (S140), information on the power facility subject to inspection is searched in a facility database downloaded to the smartphone or an external facility management server, and installed in the power facility. This can be performed by reading the CT ratio of the read CT and outputting it on the smartphone screen to receive confirmation of the read CT ratio value from the user.

In Figure 8, steps S160 and S180 for the phase value and steps S150 and S170 for the magnitude value are expressed as being performed simultaneously and in parallel. However, in other implementations, as mentioned above, steps S150 and S170 for the magnitude value are performed simultaneously. If, as a result of performing the step, it is determined (verified) that the magnitude value measured by the sensing device is in the normal range, verification of the phase value in step S180 may be performed.

Those skilled in the art to which the present invention pertains should understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features, and that the embodiments described above are illustrative in all respects and not restrictive. Just do it. The scope of the present invention is indicated by the claims described later rather than the detailed description, and all changes or modified forms 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. .

120: Inspection equipment designation unit
130: Equipment database
140: Measurement specification information acquisition unit
160: Measurement value input unit
180: Phase verification unit
190: output unit

Claims (11)

An inspection equipment designation unit that designates power equipment subject to phase measurement;
a measurement specification information acquisition unit that acquires specification information of a sensing device used to measure the phase of the power facility;
a measurement value input unit that receives the phase value measured by the sensing device;
a facility database that stores specifications and grid connection structure information of the power facility; and
A phase verification unit that verifies the phase value input from the measured value input unit according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility.
Power equipment measurement phase verification device including.
According to paragraph 1,
An output unit that outputs the phase verification results for the power equipment performed by the phase verification unit.
A power equipment measurement phase verification device further comprising:
According to paragraph 1,
The power equipment measurement phase verification device is a mobile application installed on a smartphone,
The inspection equipment designation unit and the measurement value input unit are SW modules that receive user input using the UI of the smartphone. A power equipment measurement phase verification device.
According to paragraph 1,
The measurement specification information acquisition unit,
Power facility measurement that searches for information on equipment designated by the inspection equipment designation unit, reads the CT ratio of the CT mounted on the designated equipment, prints it on the smartphone screen, and receives confirmation from the user of the read CT ratio value. Phase verification device.
According to paragraph 1,
A size verification unit that verifies the size value measured by the sensing device according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility.
A power equipment measurement phase verification device further comprising:
According to clause 5,
The measured value input unit receives the magnitude value as well as the phase value measured by the sensing device,
The phase verification unit is a power equipment measurement phase verification device that performs verification of the phase value when the size verification unit determines that the size value is in a normal range.
Specifying a power facility that is the target of phase measurement according to user input;
Obtaining specification information of a sensing device used to measure the phase of the power facility from a facility database that stores specifications and grid connection structure information of the power facility;
Receiving a phase value measured by the sensing device; and
Verifying the input phase value according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility.
Power equipment measurement phase verification method including.
In clause 7,
Step of outputting phase verification results for the power equipment
A power equipment measurement phase verification method further comprising:
In clause 7,
Receiving a size value measured by the sensing device; and
Verifying the size value according to the specifications and grid connection structure information of the power facility and the specification information of the sensing device used to measure the phase of the power facility
A power equipment measurement phase verification method further comprising:
In clause 7,
The power equipment measurement phase verification method is performed by a smartphone application,
The step of specifying the power equipment is,
A candidate list of target facilities is displayed on the screen according to the location information determined by the smartphone,
A power facility measurement phase verification method performed by selecting a user from the candidate list.
In clause 7,
The step of acquiring specification information of the sensing device is,
By querying the information of the power equipment subject to inspection,
Reading the CT ratio of the CT mounted on the power equipment,
A power facility measurement phase verification method that is performed by printing this on the screen and receiving confirmation from the user about the read CT ratio value.

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