WO2019177253A1

WO2019177253A1 - System for managing circuit breaker in distribution switchboard

Info

Publication number: WO2019177253A1
Application number: PCT/KR2019/000492
Authority: WO
Inventors: 임창준
Original assignee: 엘에스산전 주식회사
Priority date: 2018-03-14
Filing date: 2019-01-11
Publication date: 2019-09-19
Also published as: KR102160425B1; KR20190108438A

Abstract

A system for managing a circuit breaker in a distribution switchboard according to the present invention comprises a detection sensor and a control apparatus. The detection sensor detects a vibration of a switch included in the circuit breaker. Also, the control apparatus transmits, to the circuit breaker, a control signal for control of the switch. Further, the control apparatus detects a possibility of deviation of the circuit breaker or a non-operation of the switch, on the basis of a detection waveform which is a waveform of the vibration detected by the detection sensor for vibration detection.

Description

Breaker management system in switchboard

The present invention relates to a circuit breaker management system in the switchboard, and more particularly, to a circuit breaker management system for detecting the possibility of the breaker or the switch operation of the breakers installed in the switchboard panel.

In the switchboard, a plurality of power devices for power conversion, transmission, and measurement are arranged. Among these, a circuit breaker disposed on a power line protects the switchboard, the load connected thereto, and various systems by blocking the line when an element such as an overcurrent, an overvoltage, an undervoltage, a short circuit, or a ground fault is detected on the line.

The switchboard panel can be opened and closed. Since the door is normally closed, it is difficult for an administrator or user to grasp the situation inside the switchboard panel without opening the door.

For example, when the switchboard is driven for a long time, the fastening state of the breaker fastened to a slot or the like in the switchboard panel is weakened and the breaker may be separated from the slot. In this case, the line in which the breaker is disposed may cause a disconnection, and the power supplied to the loads connected to the line may be unexpectedly interrupted.

In addition, a control device such as a gateway or a data logger transmits a control signal for the purpose of operating a switch of a breaker arranged on a specific line. However, when the breaker does not receive the control signal normally or the switch does not operate, the switch of the breaker does not operate according to the control signal.

In the related art, the administrator or the user did not monitor the switch of the breaker in real time, and thus there was a problem in that the malfunction of the switch as described above was not immediately detected.

The problem to be solved by the present invention is to provide a breaker management system in the switchboard that can quickly detect the possibility of the breakers disposed in the switchboard panel, or whether the switch is normally operated.

The circuit breaker management system according to the present invention includes a sensor and a control device. The sensor detects vibration generated when the switch included in the breaker operates. The control device then transmits a control signal for controlling the switch to the breaker. In addition, the control device detects the possibility of breakage of the breaker or non-operation of the switch based on a sensing waveform which is a waveform of the vibration sensed by the vibration sensing sensor.

In one embodiment of the present invention, the control device includes a memory in which the reference waveform is stored. In addition, the control device compares the reference waveform with the sensing waveform to detect the possibility of breaker breakage or non-operation of the switch.

In one embodiment of the present invention, the control device determines that the breaker is in a steady state when the difference between the reference waveform and the sense waveform does not exceed the threshold. On the other hand, when the difference between the reference waveform and the sense waveform exceeds the threshold, it is determined that the breaker may be detached or the switch is in an inoperative state.

In one embodiment of the present invention, when the magnitude of the sense waveform is larger than the reference magnitude at a predetermined point in time, the control device determines that there is a possibility of breakage of the breaker.

In an embodiment of the present invention, when the magnitude of the sense waveform is smaller than the reference magnitude at a predetermined point in time, the control device determines that the switch is in an inoperative state.

In an embodiment of the present invention, the control device accumulates and stores waveforms generated in the normal operation of the switch in a memory. The reference waveform is updated based on the cumulatively stored waveforms.

In one embodiment of the present invention, the control device includes a gateway provided in the switchboard panel.

In one embodiment of the invention the vibration sensor is embedded in the gateway.

In one embodiment of the invention the control device further comprises a data logger connected to the gateway. The data logger receives data on the sense waveform from the gateway, and detects the possibility of breaker breakage or non-operation of the switch based on the received data.

In one embodiment of the present invention, the control device transmits a detection result to the terminal when it is detected that the breaker may be detached or the switch is in an inoperative state.

The breaker management system of the present invention has an effect of detecting in real time the possibility of breakage of the breaker or malfunction of the switch.

In addition, since the vibration is detected, which is a physical characteristic of the switch operating according to the control signal, there is an advantage of high reliability of the detection result.

In addition to the effects described above, the specific effects of the present invention will be described together with the following description of specifics for carrying out the invention.

1 is a schematic diagram illustrating a circuit breaker management system in a switchboard according to an exemplary embodiment of the present invention.

2 is a schematic block diagram of a gateway included in a breaker management system in a switchboard according to an exemplary embodiment of the present invention.

3 is a flowchart illustrating an operation of a circuit breaker management system in a switchboard according to an exemplary embodiment of the present invention.

4 is an exemplary diagram illustrating an operation of a gateway transmitting a control signal for operating a switch of a specific breaker.

FIG. 5 is a diagram illustrating an example of a waveform detected by a vibration sensor when a switch of a specific circuit breaker receiving the control signal of FIG. 4 normally operates.

FIG. 6 is a diagram illustrating an example of a waveform detected by a vibration sensor when a switch of a specific circuit breaker receiving the control signal of FIG. 4 does not operate normally.

FIG. 7 is a diagram illustrating an example of a waveform sensed by a vibration sensing sensor when a specific breaker having a possibility of departure receives a control signal of FIG. 4 to operate a switch.

FIG. 8 is a diagram illustrating an example of a notification provided when a possibility of departure of a specific breaker is detected according to the embodiment shown in FIG. 7.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other. In addition, in describing the embodiments disclosed herein, when it is determined that the detailed description of the related known technology may obscure the gist of the embodiments disclosed herein, the detailed description thereof will be omitted. In addition, the accompanying drawings are intended to facilitate understanding of the embodiments disclosed herein, but are not limited to the technical spirit disclosed herein by the accompanying drawings, all changes included in the spirit and scope of the present invention. It should be understood to include equivalents and substitutes.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, a breaker management system (hereinafter, referred to as a 'breaker management system') in a switchboard includes a plurality of breakers 11 and relays 12 provided inside the switchboard panel 10. , A meter 13, a gateway 14, a data logger 20, a server 30, and the like. Since the breaker management system is not composed of only the components shown in FIG. 1, the breaker management system may include more or fewer configurations.

A plurality of breakers 11 may be disposed in the switchboard panel 10. The number of breakers disposed inside the switchboard panel 10 may be determined based on the number of lines branching inside the switchboard panel 10. For example, each of the breakers 11 may be fixedly installed in a slot or the like inside the switchboard panel 10.

Each of the circuit breakers 11 may protect the switchboard and the load or various systems connected thereto by blocking the line when an element such as an overcurrent, overvoltage, undervoltage, short circuit, or ground fault is detected in the line. The breakers 11 may be disposed to correspond to each of the tracks one by one to perform a blocking operation of the corresponding track. Each of the breakers 11 may be implemented as an air circuit breaker (ACB), a molded case circuit breaker (MCCB), a molded circuit breaker (MCB), or the like. In general, the ACB with the highest allowable current may be placed on the upper line, and the MCB with the lowest allowable current may be placed on the lower line.

The breakers 11 are disposed on each of the branched lines in the switchboard panel 10, and thus the breakers 11 may also have a line relationship according to an ancestry relationship between the lines.

Each of the breakers 11 may include a switch (not shown). When each of the breakers 11 is switched off, the arranged line is cut off to stop the power supply, and when the switch is turned on, the power supply may be resumed. For example, each of the breakers 11 may turn the switch on / off based on a control signal received from the gateway 14. According to an embodiment, an administrator or a user may manually operate the switch to turn on / off the switch. The switch may be provided in the form of a physical switch so that the position may change when the switch is turned on or off, and a certain level of vibration may occur.

The relay 12 may control to supply or cut off power to a load end such as a motor or an electric motor, and may protect the load end when an accident current such as overcurrent or short circuit current occurs in the current flowing through the load end. The relay 12 may be implemented as an electronic motor protection relay (EMPR), but is not limited thereto.

The meter 13 can measure and monitor the amount of power in the power system of the switchboard. For example, the meter 13 may be implemented as a digital integrated meter (GIMAC), but is not limited thereto.

The gateway 14 may be provided in the switchboard panel 10. According to an embodiment, the gateway 14 may be disposed outside the switchboard panel 10.

The gateway 14 is connected (e.g., RS485, etc.) with the breakers 11, the relay 12, and the meter 13 in the switchboard panel 10 according to a wired or wireless communication scheme, so that the breakers 11, the relay Various information related to the operation state of the switchboard can be received from each of the 12 and the meter 13. The gateway 14 may transmit the received information to the data logger 20 or the server 30. In addition, the gateway 14 receives a control command for the components inside the switchboard panel 10 from the data logger 20, the server 30, or the like, and based on the received control command, the

components

11, 12, 13) or the

configuration

11, 12, 13 may be controlled by generating the control command directly.

According to an embodiment, the gateway 14 may be connected to a human machine interface 40. The HMI 40 may be provided on an outer surface of the switchboard panel 10 or on the outside of the switchboard panel 10. The HMI 40 may receive various information related to an operation state in the switchboard panel 10 from the gateway 14 and display the information in a graphic or text form. In addition, the HMI 40 may receive various commands or requests related to the operation of the switchboard from an administrator or a user, and transmit the received commands or requests to the gateway 14. The gateway 14 may process a command or request received from the HMI 40, and output the processing result through the HMI 40.

The data logger 20 may be connected to the gateway 14 and the server 30 through a wired or wireless communication scheme. The data logger 20 receives various information related to the operation of the gateway 14 and the lower devices (the breakers 11, the relay 12, the meter 13, etc.), and receives the received information from the server 30. Can be sent to. In addition, the data logger 20 may transmit a control command received from the server 30 to the gateway 14.

The server 30 may be implemented in the form of a cloud server to integrally manage information in the switchboard panel 10.

The gateway 14, the data logger 20, or the server 30 may correspond to a control device of a switchboard control system. Such a control device can control the

components

11, 12, 13 in the switchboard panel 10.

The gateway 14, the data logger 20, or the server 30 may be connected to the administrator's or user's terminal 60 (for example, a smartphone, a tablet PC, a notebook, a desktop, etc.) through various known communication methods. That is, the control device may transmit various information related to the operation of the switchboard to the terminal 60. In addition, the control device receives a control command for controlling the

components

11, 12, 13 in the switchboard panel 10 from the terminal 60, and generates a control signal based on the received control command. , 12, 13).

The breaker is fixed to a slot or the like in the switchboard panel 10. In addition, the breaker may be detached from the slot due to a weakening force as the switchboard is operated for a long time. In this case, damage or disconnection of the line on which the corresponding breaker is disposed may occur, which may cause an unexpected interruption of power supply to loads connected to the line.

In addition, in order to block a specific line, a control device such as a gateway 14, a data logger 20, a server 30, or the like may output a control signal for switching off the breaker 11 disposed on the specific line. have. However, when the circuit breaker 11 does not receive the control signal normally or a switch breakdown occurs, an error that the switch cannot be turned off may occur. Since an administrator or user does not always monitor whether the breaker is switched off, the occurrence of such an error was difficult to identify immediately.

The circuit breaker management system according to an exemplary embodiment of the present disclosure may minimize the occurrence of the above-described problems by providing a real time notification to a manager by detecting a breaker state such as a possibility of breakage of the breakers 11 or a switch non-operation. have.

Hereinafter, an embodiment related to the operation of the circuit breaker management system according to an exemplary embodiment of the present disclosure will be described with reference to FIGS. 2 to 8.

In the following figures, it is assumed that the gateway 14 detects the possibility of departure or switch non-operation of each of the breakers 11. However, according to an embodiment, the data logger 20 or the server 30 may detect the detachment possibility or the switch non-operation. In this case, the gateway 14 may transmit data related to the vibration sensed by the vibration sensor 142 to the data logger 20 or the server 30.

Referring to FIG. 2, the gateway 14 includes a communication unit 141, a memory 143, and a controller 144.

The communication unit 141 includes a gateway 14 and breakers 11, a gateway 14 and a relay 12, a gateway 14 and a meter 13, a gateway 14, a data logger 20, and a gateway ( 14 and the HMI 40 and at least one wired / wireless communication module for enabling communication between the gateway 14 and the terminal 60.

The memory 143 may store various information related to the operation of the gateway 14, information about the

components

11, 12, and 13 included in the switchboard panel 10, and the like. In particular, the memory 143 may store information on reference waveforms of vibrations generated when the breaker 11 switches (eg, when the switch is turned off). In addition, the memory 143 may store an algorithm related to an operation of the breaker management system, which will be described later with reference to FIG. 3.

The controller 144 may control the overall operation of the gateway 14. The controller 144 may perform an operation of the breaker management system to be described later with reference to FIG. 3 based on an algorithm stored in the memory 143.

In particular, the gateway 14 according to the embodiment of the present invention may include a vibration sensor 142. The vibration sensor 142 may be implemented as a MEMS sensor such as an acceleration sensor. The vibration sensor 142 may be provided in a form embedded in the gateway 14, but according to an embodiment, the vibration sensor 142 may be spaced apart from the gateway 14 and fixed to an inner wall of the switchboard panel 10, and the cable may be connected to the gateway 14. It may also be provided in a form that is connected to.

The vibration sensor 142 may detect vibration generated when a state change of the breakers 11 is switched off or on. The controller 144 may detect a state such as whether the switch is in normal operation or a breaker may be detached based on the vibration sensed by the vibration sensor 142.

According to an embodiment, the vibration sensor 142 may detect an earthquake or an external shock at a place where the switchboard panel 10 is installed.

Referring to FIG. 3, the breaker management system may control a switch operation of the breaker (S100).

For example, the gateway 14 may sequentially turn off the switches of each of the breakers 11 for the switch test of each of the breakers 11 in the initial installation of the switchboard. Alternatively, the gateway 14 may switch off the breaker disposed on the specific line for the blocking operation of the specific line during the operation of the switchboard.

The circuit breaker management system may detect vibrations according to the switch operation of the circuit breaker using the vibration sensor 142 (S110).

As described above in FIG. 1, each of the breakers 11 may include a switch implemented in a physical form. The switch may generate a vibration as the position is changed as the state is changed (on-> off or off-> on). The vibration may be transmitted to the vibration detection sensor 142 embedded in the gateway 14 or attached to the switchboard panel 10 through a slot to which the breaker and the breaker are fastened.

The circuit breaker management system may compare the waveform of the vibration detected by the vibration sensor 142 with a reference waveform (S120).

In the embodiment of the present invention, the waveform of the vibration detected by the vibration sensor 142 is defined as a detection waveform. Thus, the management system compares the sense waveform with the reference waveform.

The controller 144 of the gateway 14 may compare the reference waveform stored in the memory 143 with the detection waveform detected by the vibration detection sensor 142. For example, the controller 144 may perform various comparisons, such as amplitude comparison at a plurality of specific time points, gain comparison at a plurality of frequencies, phase comparison between a reference waveform and a sense waveform, and comparison using cross-correlation. By using the method, the reference waveform and the sensing waveform can be compared.

5 to 7, which will be described later, show an analog waveform for convenience of explanation, but the actual controller 144 compares the waveform of the reference waveform with the detected vibration using data of a waveform converted into a digital form. Can be.

As a result of the comparison, when the difference between the detected waveform and the reference waveform does not exceed the threshold (NO in S130), the breaker management system determines that the breaker is in a normal state (S140).

The threshold value may be set based on a comparison method between the sensing waveform and the reference waveform.

The steady state may refer to a state in which the fastening of the breaker is good so that there is no possibility of detachment of the breaker from the slot, and a state in which the switch of the breaker operates normally.

On the other hand, if the difference between the detected waveform and the reference waveform exceeds the threshold (YES in S130), the breaker management system can detect the possibility of breaker breakage or switch malfunction of the breaker based on the magnitude (amplitude) of the detected waveform. There is (S140-S150). Specifically, when the difference between the sense waveform and the reference waveform exceeds the threshold, it is determined that the breaker may be detached or the switch is in an inoperative state. The controller 144 of the gateway 14 determines the detection waveform. By comparing the magnitude (amplitude) at the time point and the reference magnitude (amplitude), it is possible to detect the possibility of detachment of the breaker or the switch non-operation of the breaker. The specific time point means a predetermined time point.

As a result of the comparison, when the size at a specific time point is smaller than the reference size (YES in S140), the breaker management system may detect that the breaker switch is in an inoperative state.

On the other hand, when the size at a certain point is larger than the reference size (NO in S140), the breaker management system may detect that there is a possibility of breakage of the breaker.

The circuit breaker management system may output the detection result through an output means such as the HMI 40 or transmit the detected result to the terminal 60 of the manager or the user (S160).

For example, the detection result may be output through a screen of the HMI 40 or a display of the terminal 60. The administrator or the user may recognize that the switch of the breaker does not operate normally or recognize the possibility of the breaker break-out based on the output or transmitted sensing result, and take appropriate action accordingly.

Hereinafter, examples related to the operation of the circuit breaker management system described above with reference to FIG. 3 will be described with reference to FIGS. 4 to 8.

4 is an exemplary view illustrating an operation of a gateway transmitting a control signal for operating a switch of a specific circuit breaker, and FIG. 5 is a vibration sensor when the switch of the specific circuit breaker receiving the control signal of FIG. 4 operates normally. It is a figure which shows the example of the waveform detected by the.

Referring to FIG. 4, the controller 144 of the gateway 14 may provide a control signal CTRL for operating (eg, turning off) the switch of the ninth breaker CB9 among the plurality of breakers CB1 to CB11. The ninth breaker CB9 may be transmitted.

Referring to FIG. 5, information about a reference waveform REF_W may be stored in the memory 143 of the gateway 14 or the memory of the control device. The reference waveform REF_W refers to a waveform generated when the switch operates normally. The reference waveform REF_W may be provided in a form stored in the memory 143 when the system is initially installed. In addition, according to an embodiment, the control device accumulates and stores waveforms generated during normal operation of the switch while the breaker management system is driven, and updates the reference waveform REF_W at a predetermined time point or at a predetermined interval based on the stored waveforms. You may.

With continued reference to FIG. 5, the ninth circuit breaker CB9 may switch off based on the received control signal CTRL. As the switch is turned off at the first time point T1, vibration may occur. The vibration gradually weakens with time, and after a predetermined time, the vibration may no longer occur. When there is no possibility of the ninth breaker CB9 and the switch operates normally, the waveform detected by the vibration sensor 142 may have a form similar to the reference waveform REF_W of FIG. 5.

FIG. 6 is a diagram illustrating an example of a waveform detected by a vibration sensor when a switch of a specific circuit breaker receiving the control signal of FIG. 4 is inoperative.

Referring to FIG. 6, when the ninth breaker CB9 does not normally receive the control signal CTRL from the gateway 14 or an error occurs in the switch, the ninth breaker CB9 may not turn off the switch. have.

As the switch of the ninth circuit breaker CB9 is inoperative, vibration may not occur. That is, the waveform W1 sensed by the vibration sensor 142 may have a magnitude (amplitude) at each of the first time point T1 and the second time point T2 smaller than the reference size REF.

The controller 144 of the gateway 14 may detect that the switch is inoperative when the magnitude of the waveform W1 is smaller than the reference magnitude REF at each of the first time point T1 and the second time point T2. have.

Referring to FIG. 7, when the ninth circuit breaker CB9 is not normally fastened in the switchboard panel 10 or the fastening state is weakened, the duration of vibration generated when the ninth circuit breaker CB9 is operated is relatively related. Can be increased.

That is, the waveform W2 sensed by the vibration sensor 142 has a magnitude (amplitude) greater than the reference magnitude REF at the second time point T2 after a predetermined time has elapsed from the first time point T1. Can be.

When the magnitude of the waveform W2 is greater than the reference magnitude REF at the second time point T2, the controller 144 of the gateway 14 may detect that there is a possibility of departure of the ninth breaker CB9. have.

That is, the breaker management system may detect the non-operation of the switch or the likelihood of departure of the breaker based on the vibration generated during the switch operation of the breaker.

Referring to FIG. 8, when the likelihood of departure of the ninth breaker CB9 is detected, the controller 144 of the gateway 14 may detect the ninth breaker CB9 through the HMI 40. The screen 800 indicating the possibility of departure may be displayed.

For example, the screen 800 may include a message for inducing an administrator or a user to check a fastening state of the ninth breaker CB9 as the possibility of departure of the ninth breaker CB9 is detected. An administrator or a user may conveniently confirm that there is a possibility of departure of the ninth breaker CB9 based on the screen 800, and may take measures accordingly.

That is, the breaker management system may provide a detection result to an administrator or a user by detecting the non-operation of the switch or effectively detecting the possibility of departure of the breaker, based on the vibration generated when the breaker switches. Accordingly, the manager or the user can more conveniently and effectively manage the breakers in the switchboard panel 10.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

Vibration detection sensor for detecting the vibration generated during the operation of the switch included in the breaker; And

A control device which transmits a control signal for controlling the switch to the circuit breaker, and detects a breakdown possibility of the circuit breaker or non-operation of the switch based on a detection waveform which is a waveform of vibration detected by the vibration detection sensor. My breaker management system.
The method of claim 1,

The control device includes a memory in which the reference waveform is stored,

The control device is a breaker management system in the switchboard for comparing the reference waveform and the detection waveform to detect the possibility of departure of the breaker or non-operation of the switch.
The method of claim 2,

The control device,

If the difference between the reference waveform and the sense waveform does not exceed a threshold value, the circuit breaker is determined to be in a steady state,

And determine that there is a possibility of departure of the breaker or that the switch is in an inoperative state when the difference between the reference waveform and the sense waveform exceeds a threshold.
The method of claim 3,

The control device,

And determining that there is a possibility of departure of the breaker when the magnitude of the sense waveform is larger than a reference size at a predetermined point in time.
The method of claim 3,

The control device,

And determining that the switch is in an inoperative state when the magnitude of the sensing waveform is smaller than a reference size at a predetermined point in time.
The method of claim 2,

The control device,

Accumulate and store waveforms generated in the normal operation of the switch in the memory,

A circuit breaker management system in the switchboard for updating the reference waveform based on accumulated and stored waveforms.
The method of claim 1,

The control device,

Breaker management system in a switchboard including a gateway provided in the switchboard panel.
The method of claim 1,

The control device,

Breaker management system in a switchboard including a gateway provided in the switchboard panel.
The method of claim 7, wherein

The control device,

Further comprising a data logger connected to the gateway,

The data logger is,

Receiving data on the detection waveform from the gateway,

A breaker management system in a switchboard that detects the possibility of detachment of the breaker or non-operation of the switch based on the received data.
The method of claim 1,

The control device,

The breaker management system in the switchboard for transmitting the detection result to the terminal, if it is detected that the breaker may be separated or the switch is in the inoperative state.