KR102539027B1 - Switchboard self-diagnostic system capable of smart monitoring and remote control - Google Patents

Abstract

The present invention is a partial discharge sensor for detecting the internal partial discharge of the switchgear; a temperature sensor that senses the internal temperature of the switchgear in a plurality of zones; Sensor units composed of: thermal pigments configured in a plurality of zones to be discolored according to changes in the internal temperature of the switchgear, and each configured adjacent to the temperature sensors installed in the plurality of zones; photographing means for photographing the color of the thermal pigment; A control device that receives all of the partial discharge signal from the partial discharge sensor, the temperature signal from the temperature sensor, and the video signal from the photographing means to determine the partial discharge and temperature of the switchgear, and controls the operation of the switchgear according to the judgment result. ; and a remote control server that shares the partial discharge signal from the partial discharge sensor, the temperature signal from the temperature sensor, and the image signal from the photographing means with the control device, and remotely controls the operation of the switchgear according to the determination result. Disclosed is a switchgear self-diagnosis system for easy smart monitoring and remote control. In the present invention, the sensor unit, the control device and the remote control server are wired and wirelessly networked, and the remote control server may be an administrator terminal. In the present invention, the installation positions of the temperature sensor and the thermal pigment correspond to each other inside and outside the switchgear, and considering that the temperature sensor and the thermosensitive pigment are installed inside and outside the switchgear, respectively, the temperature sensor directly affected by the internal temperature of the switchgear The temperature sensed by the sensor and the color changed by the thermal pigment are matched with a predetermined tolerance to prevent errors in judgment that may occur due to differences in configuration positions of the temperature sensor and the thermal pigment. When the internal temperature of the switchgear is out of the normal temperature and does not recover within a certain period of time, the temperature sensitive pigment maintains the color corresponding to it when the temperature of the switchgear is overheated even temporarily so that the manager can inspect it.

Description

Switchboard self-diagnosis system for easy smart monitoring and remote control {SWITCHBOARD SELF-DIAGNOSTIC SYSTEM CAPABLE OF SMART MONITORING AND REMOTE CONTROL}

The present invention relates to a self-diagnosis system for smart monitoring and easy remote control.

More specifically, the present invention provides a network of various sensors for detecting problems inside switchboards, a control device for processing detection signals by the sensors, and a remote control server (manager's smartphone, etc.) It is possible to manage the internal state of switchgear at all times by phone.

In addition, a partial discharge sensor for detecting partial discharge of the switchgear, a temperature sensor for detecting the temperature that can cause partial discharge, and a thermal pigment that is discolored according to the temperature change are combined in various ways to detect the partial discharge and temperature of the switchgear. is determined, and accordingly, the operation of the switchgear can be controlled through a smart phone or the like.

Group power consumers such as schools, buildings, apartment complexes, factories, etc. require a switchboard to receive extra-high voltage supplied from a substation and convert it to an appropriate low-voltage commercial voltage in order to obtain the power each needs.

This switchboard includes a high-voltage transformer that converts extra-high voltage to low voltage, an instrument current transformer, an automatic switch for faulty sections that switches high-voltage incoming lines, and a current-limiting high-voltage fuse within a single enclosure, which reduces the amount of power consumption on the consumer side. Accordingly, heat is generated in the high-voltage transformer, etc., and the temperature inside the enclosure rises.

Excessive rise of the internal temperature of the enclosure in the switchboard reduces the operation efficiency and accuracy of various parts and devices and can cause a fire. When it is determined that the temperature has been reached, the cooling fan is immediately operated to forcibly lower the internal temperature of the enclosure.

The temperature cooling operation inside the switchboard enclosure through forced ventilation has high heat dissipation efficiency, so it can solve the problem of power loss due to the high temperature coefficient of resistance of connection terminals or busbars of various devices and facilities in the device.

However, the heat dissipation operation of the switchboard through the forced ventilation causes the inflow of fine dust from the outside and also disperses the fine dust inside to relocate and fix it. As a result, the temperature coefficient of resistance of terminals or busbars of various facilities or devices in the switchboard is reduced. will increase

In addition, in power facilities, insulation deterioration occurs under the influence of mechanical stress, temperature, etc., resulting in local partial discharge in an internal insulation portion.

Partial discharge generally occurs when the breakdown voltage is reached due to insulation deterioration. The physical phenomena that appear are light, sound (sound signal), RF signal (electromagnetic signal), discharge leakage current (electrical red signal) is emitted.

This partial discharge signal is generated in the form of an impulse with a short pulse width, and the size of the signal is proportional to the amount of discharge and occurs when the discharge initiation voltage is exceeded in repeated AC cycles. It has a characteristic that appears repeatedly in the phase.

Even if there is no problem in the performance and operation of the system in the beginning, the partial discharge phenomenon has a problem in that the degree of insulation deterioration increases due to the electric tree and oxides generated during the partial discharge when it occurs for a continuous period of time.

In order to solve this problem, a technology for detecting partial discharge by analyzing the frequency of electromagnetic waves generated from partial discharge installed in an insulation device, a technology for detecting partial discharge with a pulse pattern of partial discharge using a current signal, and a number of A technology for detecting the position of partial discharge by using the arrival time difference of an acoustic emission signal and a partial discharge detection system of a switchboard equipped with an acoustic emission signal sensor have been proposed.

Patent Registration No. 10-1489300 relates to an integrated switchgear for arc, partial discharge and temperature monitoring and a switchgear control method using the same, which includes a detection unit that detects temperature, arc, and partial discharge inside the switchgear; and a leakage current detecting unit for detecting leakage current leaking from the switchgear circuit, a current converter for converting current when overcurrent flows in the switchgear, and an overcurrent for preventing the current induced from the current converter from damaging the circuit. An integrated interface unit including a protection unit; A controller that controls the switchgear when risk is determined based on whether the temperature detected by the detection unit and whether an arc has occurred and the leakage current detected by the integrated interface unit are mutually linked on the same interface to determine whether or not a reference value inside the switchgear has been exceeded. , Arc, Partial Discharge is integrated to protect the switchgear protection relay, check the precursor of an accident at the beginning of the accident, measure it with the integrated instrument and inform the manager of the change at the beginning of the accident to prevent an accident in the first place. making it possible

Patent Registration No. 10-1823007 relates to an eco-friendly switchboard equipped with partial discharge, temperature diagnosis function, and IoT technology. A diagnosis device for detecting and diagnosing partial discharge and temperature, wherein the diagnosis device includes: a UHF sensor for detecting partial discharge and resonant frequency; a temperature sensor attached to the measurement part and outputting a resonant frequency according to a change in temperature; a repeater for receiving and transmitting the signal output from the UHF sensor; and a diagnostic device for diagnosing partial discharge and temperature based on the signal received from the repeater and transmitting the diagnosis result to an external device, using a molded UHF sensor to generate a part generated inside an enclosed space. Discharge can be detected, and the temperature can be detected in a wireless manner by being contact-type installed at the point where temperature monitoring is required.

Patent Registration No. 10-1529818 relates to a diagnosis system for monitoring the state of a switchboard, which includes a plurality of sensors installed in the switchboard that detect two or more different signals among partial discharge signals, temperature signals, and arc signals generated in the switchboard. a sensor unit to; Collecting a plurality of measurement data for monitoring and diagnosing control of the state of the switchboard through signal processing by receiving two or more different ones of the partial discharge signal, the temperature signal, and the arc signal from a sensor unit including the plurality of sensors data collection device; and a remote monitoring device for receiving the plurality of measurement data from the data collection unit and monitoring and diagnosing the state of the switchboard, including internal and external elements of the switchboard (electrical, thermal, chemical stress and vibration, environmental factors ), insulation is destroyed due to deterioration or mechanical coherence is weakened, and accident signs that can eventually lead to accidents are detected early to prevent the spread of accidents in advance.

1. Republic of Korea Patent Registration No. 10-1489300 (2015. 01. 28. Registration, name: arc, partial discharge and temperature monitoring integrated switchboard and switchboard control method using it) 2. Republic of Korea Patent Registration No. 10-1823007 (2018. 01. 23. Registration, name: Eco-friendly switchboard equipped with partial discharge, temperature diagnosis function and IoT technology) 3. Republic of Korea Patent Registration No. 10-1529818 (2015. 06. 11. Registration, name: Diagnosis system for monitoring switchboard status)

An object of the present invention is to network various sensors for detecting problems inside switchgear, a control device for processing detection signals by the sensors, and a remote control server (manager's smartphone, etc.), so that the control device or smartphone can be used on-site or remotely. It is an object of the present invention to provide a switchgear self-diagnosis system that enables smart monitoring and remote control to enable constant management of the internal state of switchgear.

Another object of the present invention is to detect the partial discharge of the switchgear and to more easily determine whether the switchgear is normal or not by using a temperature sensor for detecting a temperature that can cause the partial discharge, and a thermal pigment that is discolored according to the temperature. It is based on determining whether the switchgear is normal by combining all three signals, but two or more signals are selectively used as signals to determine whether the switchgear is normal or not depending on the state of sensor failure, etc. It is to provide a switchgear self-diagnosis system that enables smart monitoring and remote control.

Another object of the present invention is to correspond the installation positions of the temperature sensor and the thermosensitive pigment to each other inside and outside the switchboard, and to match the temperature sensed by the temperature sensor and the color changed by the thermosensitive pigment with a predetermined tolerance, so that the temperature sensor and It is an object of the present invention to provide a switchgear self-diagnosis system that can be easily monitored and remotely controlled so as to prevent errors in judgment that may occur due to differences in the location of the thermosensitive pigment.

Another object of the present invention is to form a thermosensitive pigment into an irreversible material so that a manager can take measures such as inspection when overheating of a switchgear is maintained for a certain period of time, even temporarily, to facilitate smart monitoring and remote control. It is to provide a switchgear self-diagnosis system.

Another object of the present invention is to diversify the attachment positions of the thermal pigments on the switchgear, and if some of the plurality of thermal pigments are separated or scratched from the switchgear and the thermal discoloration does not normally occur, this is excluded from the normal judgment factor of the switchgear. It is to provide a switchgear self-diagnosis system that can easily monitor and remotely control the switchgear, thereby preventing errors in determining whether the switchgear is normal or not.

In addition, other objects of the present invention may be inferred according to the description below.

In order to achieve the above object, the switchgear self-diagnosis system for easy smart monitoring and remote control according to an embodiment of the present invention,

a partial discharge sensor that detects partial discharge inside the switchgear;

a temperature sensor that senses the internal temperature of the switchgear in a plurality of zones;

A thermal pigment configured in a plurality of zones to be discolored according to changes in the internal temperature of the switchgear;

The thermosensitive pigments are each configured adjacent to temperature sensors installed in a plurality of zones;

photographing means for photographing the color of the thermal pigment;

A control device that receives all of the partial discharge signal from the partial discharge sensor, the temperature signal from the temperature sensor, and the video signal from the photographing means to determine the partial discharge and temperature of the switchgear, and controls the operation of the switchgear according to the judgment result. ; and

A remote control server that shares the partial discharge signal from the partial discharge sensor, the temperature signal from the temperature sensor, and the video signal from the photographing means with the control device, and remotely controls the operation of the switchgear according to the judgment result. to be characterized

In the present invention, the sensor unit, the control device and the remote control server are wired and wirelessly networked, and the remote control server is a manager terminal.

In the present invention, the installation positions of the temperature sensor and the thermal pigment correspond to each other inside and outside the switchgear, and considering that the temperature sensor and the thermosensitive pigment are installed inside and outside the switchgear, respectively, the temperature sensor directly affected by the internal temperature of the switchgear It is characterized in that the temperature sensed by the sensor and the color changed by the thermal pigment are matched with each other with a predetermined tolerance, thereby preventing errors in judgment that may occur due to differences in configuration positions of the temperature sensor and the thermal pigment.

In the present invention, the thermosensitive pigment is formed of an irreversible material, so that even if the internal temperature of the switchgear is out of the normal temperature and recovered within a short time, the color is maintained so that the manager can inspect it.

In the present invention, the control device and the remote control server

Based on the video signal of the thermosensitive pigment, it is determined whether the thermosensitive pigment is damaged, and if it is normal, the partial discharge signal, the temperature signal, and the video signal of the thermosensitive pigment are all combined and reflected in the operation of determining whether the switchgear is normal or not,

If it is determined that there is damage to the thermal pigment by the video signal, the video signal is not reflected in determining whether the switchboard is normal or not, and only the partial discharge signal and the temperature signal from the partial discharge sensor and the temperature sensor are combined to determine whether the switchboard is normal or not. It is characterized in that it is reflected in the action.

In the present invention, the partial discharge sensor is a sensor in which light of a specific wavelength is coupled to the cladding from an optical fiber core according to acoustic waves,

When the light of a specific wavelength range from a light source of a broadband wavelength passing through an optical fiber is combined from the fiber core to the cladding according to the frequency of the acoustic wave, a lot of the light of the specific frequency range escapes as the intensity of the acoustic wave increases. As the frequency is changed, the wavelength of light in a specific frequency range coupled from the core to the cladding is changed, and the light passing through the optical fiber passes through the optical fiber to which acoustic waves are applied,

It is characterized in that the partial discharge is determined by monitoring the intensity and wavelength of the light coupled to the cladding by the acoustic wave with a photodetector.

In the present invention, if it is determined that the internal temperature of the switchgear is not normal,

A solenoid driving unit receiving a solenoid driving signal from a control device;

It is characterized in that a solenoid; is additionally configured to open the upper cover of the switchgear by receiving the driving signal of the solenoid driving unit and discharging internal heat.

In the present invention, the thermal pigment is a label or sticker, and is characterized in that it is configured on the outer surface of the switchgear adjacent to the area where the temperature sensor is installed.

According to the switchgear self-diagnosis system for easy smart monitoring and remote control of the present invention, various sensors for detecting problems inside the switchgear, a control device for processing detection signals by the sensors, and a remote control server (manager's smartphone, etc.) is networked, so it is possible to manage the internal state of switchgear at all times by a control device or smart phone on-site or remotely.

In addition, it is basic to determine whether the switchboard is normal or not by combining all three signals: a temperature sensor that detects partial discharge of the switchgear and detects the temperature that can cause partial discharge, and a temperature sensitive pigment that changes color depending on the temperature. However, if a sensor failure occurs, it is possible to determine the correct state of the switchgear by selectively using the remaining sensor signals to determine whether the switchgear is normal or not.

In addition, the installation positions of the temperature sensor and the thermosensitive pigment correspond to each other inside and outside the switchgear, and considering that the temperature sensor and the thermosensitive pigment are installed inside and outside the switchgear, respectively, it is detected by the temperature sensor directly affected by the internal temperature of the switchgear. It is possible to prevent errors in judgment that may occur due to differences in positions of the temperature sensor and the thermosensitive pigment by matching the temperature and the color changed by the thermosensitive pigment with a predetermined tolerance.

In addition, the thermosensitive pigment is formed as an irreversible material so that the manager can take measures such as inspection when overheating of the switchgear is maintained for a certain period of time even temporarily.

In addition, the attachment positions of the thermal pigments on the switchgear are diversified, and when some of the plurality of thermal pigments are detached or scratched from the switchgear and the function as a thermal pigment is not normally performed, this is appropriately reflected in the normal judgment of the switchgear to make a judgment error. can prevent

Other effects will become apparent to those skilled in the art from the description below.

1 is a network configuration diagram of a switchgear self-diagnosis system for easy smart monitoring and remote control according to an embodiment of the present invention.
2 is a configuration diagram for detecting partial discharge and temperature change according to an embodiment of the present invention.
3 is a network configuration diagram for detecting and determining a temperature by a temperature sensor and a thermosensitive pigment according to an embodiment of the present invention.
4 and 5 are heat dissipation control configuration diagrams according to an embodiment of the present invention.
6 to 8 are various embodiments of partial discharge sensors.
9 is a configuration diagram for determining whether a temperature sensor is out of order;

The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and the following examples may be modified in many different forms, and the scope of the present invention is as follows It is not limited to the examples. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the spirit of the invention to those skilled in the art.

Terms used in this specification are used to describe specific embodiments and are not intended to limit the present invention. As used herein, the singular form may include the plural form unless the context clearly indicates otherwise. Also, when used herein, the term “comprising” specifies the presence of the recited shapes, numbers, steps, operations, members, elements, and/or groups thereof, and one or more other shapes, numbers, operations, It does not exclude the presence or addition of members, elements and/or groups.

Most of the switchboards below 22.9kV installed in Korea use vacuum circuit breakers and are operated by contracting with a bus made of the same material.

Vacuum circuit breaker is an assembly composed of mechanical mechanisms, and after installation, deterioration occurs continuously. When deterioration of springs and wear of mechanisms occur, the pressure force of V.I (VACCUM INTERRUPTER) is weakened, resulting in heat generation and impossibility of complete insertion (half-insertion state). An ARC conduction state may occur due to

The vacuum circuit breaker in the switchboard and the busbar made of the same material are connected with fastening bolts and clips, and when the vacuum circuit breaker operates, an impact of about 450kgf X 3 (upper) occurs, which causes problems such as loosening of the bolts of the clip connection part and deformation of the contact part. occurs

In addition, a number of failures occur due to heat generation and malfunction due to loose fastening of the connection part and poor contact of the contact part clip.

In the interior of the switchgear (MCSG), the temperature measurement is inevitably partially made structurally, and it is practically difficult to monitor the temperature by measuring the temperature of a number of circuit breakers every day.

Therefore, in order to detect the risk of accidents early and maximize the efficiency of safe operation management, it would be desirable to configure a constant temperature monitoring system in the switchboard and connect it to a remote control server (DB SEVER) so that it can be monitored in the field and control room. .

In other words, the vacuum circuit breaker is a device that blocks normal current and fault current flowing in the system using a mechanical mechanism. Various insulators are used to secure insulation between the conductor panel enclosure and internal diaphragm, but many ground fault and short circuit accidents occur due to insulation damage caused by deterioration of insulation due to deterioration, corrosion, and intrusion of foreign substances into the enclosure. Insulation and partial discharge monitoring system in switchgear is essential.

However, circuit breakers and insulators installed inside switchboards cannot check the progress of insulation breakdown during operation, and it is impossible to measure insulation by taking out devices in a power outage state every day for many switchboards.

Therefore, in order to prevent ground faults and short circuit accidents due to insulation breakdown, it would be very desirable to configure a system that constantly checks the insulation state in the switchboard and connect it to a remote control server so that it can be monitored at the site and control center.

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

1 is a network configuration diagram of a switchgear self-diagnosis system for easy smart monitoring and remote control according to an embodiment of the present invention. 2 is a configuration diagram for detecting partial discharge and temperature change according to an embodiment of the present invention. 3 is a network configuration diagram for sensing and determining a temperature by a temperature sensor and a thermosensitive pigment according to an embodiment of the present invention. 4 and 5 are heat dissipation control configuration diagrams according to an embodiment of the present invention. 6 to 8 are various embodiments of a partial discharge sensor. 9 is a configuration diagram for determining whether a temperature sensor is out of order.

As shown in FIGS. 1 and 2, the switchgear self-diagnosis system, which is easy to perform smart monitoring and remote control, of the present invention measures the partial discharge and internal temperature of the switchgear 10 with a partial discharge sensor configured in the sensor unit 100 ( 110), the temperature sensor 120, and the thermal pigment 130, respectively, and when the detection signal is processed by the control device 200, an operation of determining whether the switchgear 10 is normal or not according to the processed result And, as a subsequent operation, an operation to release heat from the switchgear 10 is performed.

The partial discharge signal and the temperature signal of the switchboard are shared by the control device 200 configured in the switchboard 10 and the remote control server 300 configured in a remote location.

The sensors, the control device 200, and the remote control server 300 are wired and wirelessly networked, and constant management of switchgear is possible anytime and anywhere by sharing data obtained by processing detection signals by the sensors.

The remote control server 300 may be replaced with an administrator terminal separately networked to the remote control server, for example, a smart phone.

The internal temperature of the switchboard detected by the temperature sensor 120 is obtained by dividing into a plurality of zones as described below, and the average temperature of these plurality of zones is provided as a temperature for performing a heat dissipation operation, and the inside of the switchboard The temperature sensed for each zone divided into a plurality of zones is provided as a temperature to determine whether each component or electrical connection part is normal or abnormal.

The divided zone may be composed of four zones as shown in FIG. 3, and it is determined whether or not the normal temperature is out of each of the divided zones. In addition, in addition to the temperature of each divided zone, the temperature of an adjacent zone may be linked to determine the final temperature of the zone.

Referring to FIG. 1 , considering that partial discharge may occur in busbars, CTs, PTs, cables, and VCBs, temperature sensors 120 may be installed individually or collectively in these areas.

In addition, the heat dissipation operation may be performed based on the average temperature of the four divided zones, but based on the average temperature finally obtained by reflecting predicted values that may rise due to the influence of the temperature of other zones for a certain period of time.

At this time, the heat generated in the switchgear is usually directed upwards. Considering this, the temperature detected in the divided zone located relatively above can be detected higher than the normal temperature, and the temperature in each zone is finally determined. and calculate the average temperature.

For example, if the uppermost part of the switchgear is set as zone 1, and the lower part is set as zone 2, 3, and 4 sequentially, the heat generated in zones 3 and 4 is particularly Since it often affects zone 2, even if the temperature detected in zone 1 and zone 2 is higher than the normal temperature, the allowable temperature value is set in advance and the temperature in the zone does not exceed the allowable temperature value. can be considered normal. That is, as the heat goes upward, the temperature in the area located above may instantaneously rise. For example, if it is determined that the temperature can be restored to the original temperature within a certain time, the temperature of the area is determined to be normal.

The thermal pigment 130 is a packaged thermal pigment capable of displaying various colors and can be accommodated in, for example, a thermal pigment storage unit formed in the central portion of the front panel of the switchgear, and the color changes according to the change in the internal temperature of the switchgear. By changing and appearing, the manager can recognize the internal temperature of the switchgear even if only checking the temperature sensitive pigment.

As another embodiment, when the color of the thermal pigment 130 changes, a camera 700 for photographing the color may be installed as a photographing means, and an image signal obtained by the camera 700 is transmitted to the controller 200. ) and the control server 300, the internal temperature of the switchgear can be determined by using the thermosensitive pigment alone or in conjunction with a temperature sensor.

As shown in FIG. 3 , the thermosensitive pigment 130 may be configured to have a different color according to the grades of low temperature, appropriate temperature, ambient temperature, and warning temperature. At this time, the low temperature, proper temperature, ambient temperature, and warning temperature may be set to correspond to the temperature detected by the temperature sensor 120 when the control device 200 analyzes the temperature.

Preferably, the temperature sensor 120 is installed inside the switchboard and is directly affected by the internal temperature, and the temperature sensitive pigment 130 is installed on the outer surface of the switchboard and is less affected by the internal temperature than the temperature sensor 120. In consideration of this, a temperature obtained by adding a predetermined temperature to a temperature corresponding to a color represented by the thermal pigment 130 and a temperature detected by the temperature sensor 120 may correspond to each other. The temperature to which the predetermined temperature is added may be set in various forms depending on the external environment.

As another embodiment, the thermal-sensitive pigment may be formed as at least one label covering a predetermined portion of the switchgear to determine the heat radiation condition, and in this case, the label is formed by including at least two kinds of thermal-sensitive pigments that change color at different temperatures It can be. In addition, a predetermined mark may be marked with ink or paint containing the thermal pigment, and the mark may include at least one of letters, figures, and numbers.

As another embodiment, it may be formed of at least one sticker containing an irreversible thermal-sensitive pigment whose color irreversibly changes with a temperature change, and may be adhered to a predetermined position on the outer surface of the switchgear in a predetermined size. Because a thermosensitive pigment that is irreversibly discolored is used, once the temperature rises and discolors, it does not return to its original color.

This is because when a reversible temperature sensitive pigment is used, when abnormal heat in the switchgear temporarily occurs, it is discolored and then returned to its original state, making it impossible to check whether or not there is an abnormality in the switchgear. That is, once the internal temperature of the switchgear is out of the normal temperature and does not recover in a short time, it is safe for the manager to take inspection measures due to the nature of the switchgear. If it appears, it is judged normal only with the visually recognizable thermal pigment, and it may be impossible to inspect the switchgear.

The thermal pigment 130 composed of the label or sticker may be respectively formed in a plurality of areas on the outer surface of the switchgear. Preferably, each may be configured in an area close to the area where the temperature sensor 120 is installed.

In addition, the thermosensitive pigment may be configured to include at least two types of thermosensitive pigments to continuously change color at predetermined temperature intervals according to the temperature change of the switchgear. For example, if a temperature sensitive pigment that changes color from green to blue when the temperature of the switchgear rises to 30 to 40 ° C and a temperature sensitive pigment that changes color from blue to red when the temperature reaches 50 to 60 ° C are used together, the temperature of the switchgear increases to 30 ° C. When changing from 50 to 60 ° C. to 40 ° C., the color changes to blue and red. However, it is not limited only to these temperature values.

In addition, the thermosensitive pigment may be used alone or at least two types of thermosensitive pigments having different discoloration temperatures may be mixed. For example, if a thermosensitive pigment that changes from blue to colorless at 50 °C and a thermosensitive pigment that changes from red to colorless at 70 °C is combined, the mixed color of blue and red turns red at 50 °C and completely colorless at 70 °C. However, it is not limited only to these temperature values.

In addition, it may be formed by mixing a general pigment that is not affected by a change in temperature and a thermosensitive pigment. When a general pigment is mixed with a thermosensitive pigment that changes from blue to colorless at 50℃ or higher, it appears as a mixed color when the temperature does not rise above 50℃. However, it is not limited only to these temperature values.

The color of the irreversible thermosensitive pigment changes from one color to another color in a specific temperature range, for example, from colorless to a specific color, from a specific color to another specific color, or from a specific color to colorless. Such an irreversible thermosensitive pigment shows discoloration as the pigment is decomposed by heat, and inorganic or organic pigments may be used. As the inorganic zion pigment, inorganic metal oxides or hydrates of metal oxides, inorganic metal oxides or Mixtures of hydrates of metal oxides and the like can be used.

However, the type of irreversible thermal-sensitive pigment is not specified here, and various thermal-sensitive pigments irreversibly discolored at a predetermined temperature may be used.

The partial discharge sensor 110 is a light oil sensor that estimates a quantity to be measured using the intensity of light passing through an optical fiber, the refractive index and length of the optical fiber, the mode, and the change in polarization state, etc. The measured quantities include voltage and current. , temperature, pressure, strain, rotation rate, sound, gas concentration, etc.

Referring to FIG. 1 , considering that partial discharge may occur in busbars, CTs, PTs, cables, and VCBs, partial discharge sensors 110 may be installed individually or collectively in these areas. At this time, the partial discharge sensor 110 may be installed on the outer surface of the switchboard in consideration of the acoustic wave sensing performance.

As shown in FIG. 6 , the partial discharge sensor 110 may be a sensor in which light of a specific wavelength is coupled to the cladding from an optical fiber core according to acoustic waves.

In a light source with a broadband wavelength passing through an optical fiber, light of a specific wavelength region is combined from the fiber core to the cladding according to the frequency of the acoustic wave. As the intensity of the acoustic wave increases, a lot of light in the specific frequency region escapes. As the frequency is changed, the wavelength of light in a specific frequency range coupled from the core to the cladding is changed.

Accordingly, the light passing through the optical fiber passes through the optical fiber to which the acoustic wave is applied, and the intensity and wavelength of the light coupled to the cladding by the acoustic wave can be determined. That is, in a way to know the light intensity, the optical signal passing through the optical fiber is branched and the light intensity is monitored with a photodetector, and the other branched signal is connected to the optical fiber through which the acoustic wave travels, and the acoustic wave applied through the acoustic converter. Depending on the frequency, light of a specific wavelength is let out of the optical fiber.

At this time, if the optical signal exiting through the optical fiber is monitored with a photodetector and the frequency of the applied acoustic wave is accurately known, the wavelength of the light can be found. Therefore, based on this, it is determined whether there is a partial discharge.

On the other hand, optical fiber acoustic sensors include one using a single-mode optical fiber using a phase change of light and one using a multi-mode optical fiber using a change in light intensity due to a change in transmission loss of the optical fiber.

Therefore, as another embodiment, as shown in FIG. 7, a structure of sound pressure measurement using a single-mode optical fiber can be used, and the beam of the laser 30 is divided into two by the beam splitters 2 and 20, and one side is a reference optical fiber. 60, and the other side passes through the single-mode optical fiber 61 affected by the negative pressure 5. The optical length of the single-mode optical fiber 61 is changed by the photoelastic phenomenon caused by the negative pressure 5 or by the expansion and contraction of the optical fiber.

만큼 변화하게 된다. 이 Δ

의 위상변조를 받은 빛과, 참조용 단일모드 광섬유로부터 빛을 간섭시켜 광학적인 호모다인 검파에 의하여 비트 신호를 검출하여 트랜스듀서(50)를 이용하여 음압을 측정한다. 따라서 이를 토대로 부분방전 여부를 판단한다.As a result, in the light passing through the reference optical fiber 60 and the single-mode optical fiber 61, the phase is Δ

change as much as this Δ

The sound pressure is measured using the transducer 50 by detecting the beat signal by optical homodyne detection by interfering the light subjected to the phase modulation of and the light from the single-mode optical fiber for reference. Therefore, based on this, it is determined whether there is a partial discharge.

As another embodiment, as shown in FIG. 8, a sound pressure measurement structure using multimode optical fiber can be used, and when pressure is applied to the pressure plate, the central axis of the optical fiber is deformed in response to the change in refractive index, and the propagation mode the number of changes Since the total amount of light transmitted through the optical fiber is proportional to the number of modes, transmission loss changes due to pressure, etc., and thus an optical intensity modulation signal is obtained. Therefore, based on this, it is determined whether there is a partial discharge.

Although not shown, as another embodiment, the partial discharge sensor 110 may use two channels of a UHF (Ultra High Frequency) sensor and a TEV (Transient Earth Voltage) sensor.

The UHF sensor has a measurement range of 03 GHz to 30 GHz as a measurement frequency band for partial discharge signals, and a detection range of 300 MHz to 800 MHz for partial discharge. can be measured.

The TEV sensor has a measurement area of 20 MHz ~ 80 MHz and a partial discharge detection area of 20 MHz ~ 80 MHz, and the subject of measurement is a partial discharge in the switchboard, and it can measure the instantaneous ground potential due to partial discharge of insulator.

The control device 200 determines and displays the partial discharge and temperature (temperature based on the temperature sensor and the temperature sensitive pigment) of the switchgear and controls the Internet-based heat dissipation based on the internal temperature of the switchgear, and at the same time, By enabling remote control by the control server 300, the overall flow of returning the internal temperature of the switchgear to normal temperature is controlled.

The release of heat from the switchgear of the present invention is controlled by the control device 200 included in the switchgear 10 or remotely controlled by the control server 300.

The control device 200 controls the switchboard upper cover 600 to be opened for heat dissipation when the internal temperature (average temperature) of the switchboard is out of the normal temperature, and the control operation is performed by the solenoid driven by the solenoid driver 400 ( 500).

When the solenoid 500 is driven, the upper cover 600 of the switchgear is pushed up and the upper part of the switchgear is opened so that heat dissipation is possible. When the heat dissipation ends, that is, when the temperature returns to the normal temperature, the driving of the solenoid 500 also ends, and the upper cover 600 of the switchboard is returned to its original position.

In order to open or close the upper cover of the switchgear by the solenoid 500, a hinge may be formed on one side of the upper cover 600 and a configuration limiting the opening range may be provided on the other side. The configuration limiting the opening range may be configured by connecting a predetermined point of the upper cover 600 and the side plate of the switchboard. That is, when the solenoid 500 is driven, the upper cover 600 is opened while the hinge acts as a central axis of rotation of the upper cover 600, and is communicated with the outside to release heat.

When it is determined that the internal average temperature of the switchgear 10 configured as described above is out of the normal temperature, a heat dissipation operation is automatically performed.

The control server 300 processes the partial discharge and temperature values of the switchgear transmitted from the switchgear 10 and transmits a remote control signal to the control device 200 when it is determined that heat dissipation is necessary.

In the present invention configured as described above, when a partial discharge occurs as the internal temperature rises, the temperature sensor 120 detects the temperature and the color of the thermosensitive pigment changes. Therefore, the manager can directly recognize the color change of the thermal pigment to determine whether the internal temperature of the switchgear is normal or not, and take appropriate measures.

In addition, when the color change of the thermal pigment is photographed by the camera 700, the photographed image signal is processed by the control device 200 to determine whether the temperature of the switchboard is normal or not, and according to the determination result, the solenoid driving unit 400 ) to drive the solenoid 500 so that the heat inside the switchgear is released to the outside and returned to normal temperature.

At the same time, the control device 200 transmits the temperature value of the switchgear obtained by processing the temperature signal to the control server 300 so that the remote manager can also share it.

The present invention determines whether a switchgear is normal by combining a partial discharge signal, a temperature signal, and a changing color signal of a thermal pigment, or selectively combining them according to a sensor state, and can be implemented in various forms as follows. there is.

First, the partial discharge signal from the partial discharge sensor 110, the temperature signal from the temperature sensor 120, and the image signal obtained by photographing the thermosensitive pigment 130 are combined to determine whether the operation is normal as follows. It can be done.

The partial discharge signal detected by the partial discharge sensor 110, the temperature signal detected by the temperature sensor 120, and the image signal of the color changed by the thermal pigment 130 captured by the camera are all controlled by the device ( 200) is entered.

The control device 200 processes all of the partial discharge signal, temperature signal, and video signal to determine whether all three are within the normal range, all three are within the abnormal range, or whether one or both are within the normal or abnormal range, respectively. do. Here, the temperature signal is an average temperature detected in four divided areas.

As a result of the determination, when all three are within the normal range, the current operating state of the switchgear is maintained, and when all three are within the abnormal range, a control operation is performed to stop the current operating state of the switchgear.

On the other hand, if any one is within the abnormal range, the current operating state of the switchgear is controlled differently depending on whether the temperature value or the partial discharge value is within the abnormal range.

For example, it is determined which one has a larger change trend between the temperature value and the partial discharge signal value. In other words, it is to compare the internal temperature change trend and the partial discharge change trend of the switchgear. All of these change trends are based on the same time.

As a result, if the internal temperature of the switchgear is abnormal, but the change trend is slower than the partial discharge change trend or the range of change is not high, a predetermined time is waited. Thereafter, when the partial discharge value is included within the abnormal range during the waiting time, the current operating state of the switchgear is stopped.

However, if the partial discharge value does not change during the waiting time or the range of change is smaller than the set value, but the internal temperature maintains the abnormal range, the internal heat of the switchgear is released or the operation is stopped.

In addition, the present invention determines whether or not the thermosensitive pigment 130 is damaged based on the image signal of the camera 700 that captures the thermosensitive pigment 130, and determines whether the thermosensitive pigment 130 is damaged or not, and uses the result of the determination to determine the partial discharge signal, the temperature signal, and the thermal pigment. By combining video signals, it can be reflected in the operation of determining whether the switchgear is abnormal. The damage includes all causes that interfere with determining the temperature using the thermal pigment, such as separation from the switchgear and scratches.

In this case, the video signal of the camera 700 is provided to the control device 200 as a signal capable of determining the color and damage of the pigment, respectively. Therefore, the control device 200 determines whether the temperature value according to the color and the temperature value by the temperature sensor 120 match, and if they match, it can be determined that there is no damage.

On the other hand, if the temperature value according to the color and the temperature value by the temperature sensor 120 do not match, it is determined whether or not the thermal pigment 130 is damaged. When it is determined that the thermosensitive pigment 130 is damaged, it is excluded from the combination signal.

The temperature values are the average temperature value of the temperature values sensed by the four thermal pigments 130 and the four temperature sensors 120 in consideration of the fact that a plurality of thermal pigments 130 are configured to correspond to the temperature sensors 120. ) determines the average temperature value of the temperature values sensed by corresponding to each other.

If one or more thermal pigments 130 are damaged, the average temperature value of the temperature values detected by the thermal pigments 130 and the average temperature value of the temperature values detected by the four temperature sensors 120 do not match each other. won't Therefore, the average temperature value by the thermosensitive pigment 130 is excluded from the combination signal.

Determination of whether the temperature sensitive pigment 130 is normal is similarly applied to the temperature sensor 120, so that it is possible to determine whether the switchgear is normal or not similar to the above embodiment.

As shown in FIG. 9, the configuration for determining whether or not the temperature sensor is out of order includes a control signal generating unit 70 that generates a control signal generated from a signal generated by each temperature sensor, and a control signal generating unit 40. It consists of a control signal conversion unit 80 that converts a high level or a low level according to an input control signal, and an LED light emitting unit 90 that emits light in a predetermined color according to a signal input from the control signal conversion unit 80. can 9 shows a configuration for determining whether or not there is a failure based on signals input from three temperature sensors.

When the input of the control signal 1 input from the control signal generating unit 70 receiving the signal input from any one temperature sensor is on (when there is a signal from the temperature sensor), the first control signal conversion unit 81 passes through The control signal becomes a low signal, and in the LED set 91, the LED connected to the control signal conversion unit 81 is turned off, and the LED not connected to the control signal conversion unit 81 turns off the first control signal conversion unit 81. Since it receives a direct signal from the control signal generating unit 70 without going through it, it emits light in a predetermined color.

On the other hand, when the input of control signal 1 is OFF (when there is no signal from the temperature sensor), the control signal passing through the first control signal conversion unit 81 becomes a high signal and is connected to the first control signal conversion unit 81. The LED of the LED set 91 is turned on, and the LED not connected to the first control signal conversion unit 81 receives an off signal directly from the control signal generation unit 70 without going through the first control signal conversion unit 80. It is turned off because input is received.

In addition, when the input of the control signal 2 input from the control signal generating unit 70 receiving the signal input from the other temperature sensor is ON (when there is a signal from the temperature sensor), it passes through the second control signal conversion unit 82 One control signal becomes a low signal, and in the LED set 92, the LED connected to the second control signal conversion unit 82 is turned off, and the LED not connected to the second control signal conversion unit 82 converts the second control signal Light is emitted because it receives a signal directly from the control signal generating unit 70 without going through the unit 82.

On the other hand, when the input of the control signal 2 is OFF (when there is no signal from the temperature sensor), the control signal passing through the second control signal conversion unit 82 becomes a high signal and the LED set 92 converts the second control signal. The LED connected to the unit 82 is turned on, and the LED not connected to the second control signal conversion unit 82 receives an off signal directly from the control signal generator 70 without passing through the second control signal conversion unit 82. It is turned off because input is received.

In addition, when the input of the control signal 3 input from the control signal generating unit 70 that receives the signal input from the temperature sensor is on (when there is a signal from the temperature sensor), it passes through the third control signal conversion unit 83 One control signal becomes a low signal, and in the LED set 93, the LED connected to the third control signal conversion unit 83 is turned off, and the LED not connected to the third control signal conversion unit 83 converts the third control signal Since it receives a signal directly from the control signal generating unit 70 without going through the unit 83, it emits light.

On the other hand, when the input of the control signal 3 is OFF (when there is no signal from the temperature sensor), the control signal passing through the third control signal conversion unit 83 becomes a high signal, and the LED set 93 converts the third control signal. The LED connected to the unit 83 is turned on, and the LED not connected to the third control signal conversion unit 83 receives an off signal directly from the control signal generator 70 without passing through the third control signal conversion unit 83. It is turned off because input is received.

In this way, the present invention constitutes a green LED and a red LED, respectively, and the control signal conversion unit 80 receives the signal generated from the control signal generation unit 70, but the green LED does not go through the control signal conversion unit 80. The red LED receives the signal converted through the control signal conversion unit 80 so that one LED always emits light, so that the states of the plurality of temperature sensors can be accurately recognized at the same time.

That is, when a low signal is input, a red LED is turned on to recognize that the temperature sensor is abnormal, and when a high signal is input, a green LED is turned on to recognize that the temperature sensor is normal.

That is, when an off signal, that is, an abnormal signal of the temperature sensor is generated in the control signal generating unit 70, the off signal is converted into an on signal through the control signal conversion unit 80 and input to the LED set 91, thereby generating a red LED. it glows Therefore, the control device 200 determines whether the temperature sensor is abnormal by emitting a red LED and inspects the temperature sensor.

On the other hand, when the signal from the control signal generator 70, that is, the normal signal of the temperature sensor is generated, the OFF signal converted through the control signal converter 80 is supplied to the red LED so that it does not emit light, and the LED set 91 ), the on signal supplied directly to the green LED causes the green LED to emit light. Therefore, the control device 200 determines whether the temperature sensor is normal by green LED light emission.

As described above, the detailed description of the present invention has been described with respect to the preferred embodiments of the present invention, but this is the best embodiment of the present invention exemplarily described, but does not limit the present invention. In addition, it is of course possible for anyone having ordinary knowledge in the technical field to which the present invention belongs to various modifications and imitations without departing from the scope of the technical idea of the present invention.

Therefore, the scope of the present invention is not limited to the above-described embodiments, but may be implemented in various forms of embodiments within the scope of the appended claims. And without departing from the subject matter of the present invention claimed in the claims, anyone with ordinary knowledge in the art to which the invention pertains is considered to be within the scope of the claims of the present invention to various extents that can be modified.

An embodiment for implementing a switchgear self-diagnosis system for easy smart monitoring and remote control according to the present invention has been described. The embodiments described above are illustrative of some of the many specific embodiments that demonstrate the principles described herein. Therefore, by using the embodiments of the present invention, those skilled in the art will be able to easily implement many other arrangements within the scope defined by the claims of the present invention.

1: lens 2, 20: beam splitter
5: negative pressure 50: transducer
60: optical fiber for reference 61: single-mode optical fiber
70: control signal generating unit 80: control signal conversion unit
90: LED set 100: sensor unit
110: partial discharge sensor 120: temperature sensor
130: thermosensitive pigment 200: control device
300: remote control server 400: solenoid driving unit
500: solenoid 600: upper cover of switchgear

Claims (8)

a partial discharge sensor that detects partial discharge inside the switchgear;
a temperature sensor that senses the internal temperature of the switchgear in a plurality of zones;
Sensor units composed of: thermal pigments configured in a plurality of zones to be discolored according to changes in the internal temperature of the switchgear, and each configured adjacent to the temperature sensors installed in the plurality of zones;
The partial discharge sensor uses a sound pressure measurement structure using a multimode optical fiber, and when pressure is applied to the pressure plate, the central axis of the optical fiber is deformed in response to the change in refractive index, the number of propagation modes is changed, and transmitted to the optical fiber Since the total amount of light is proportional to the number of modes, when the transmission loss changes due to pressure and an optical intensity modulation signal is obtained, partial discharge is determined based on this.
The temperature sensor includes a control signal generator for generating a control signal indicating normal or abnormal signals transmitted from the temperature sensor to determine whether the temperature sensor operates normally;
a control signal conversion unit for converting an input signal when the signal output from the control signal generation unit is a signal corresponding to a case where the sensor is abnormal; and
A green LED that emits green light by receiving a signal when the sensor output from the control signal generating unit is normal, and a signal corresponding to when the sensor output from the control signal generating unit is abnormal is transmitted to the control signal conversion unit. The LED light emitting unit composed of a red LED that emits red light after receiving the signal output from the changed temperature sensor;
The thermal-sensitive pigment is an irreversible thermal-sensitive pigment whose color changes irreversibly with temperature change, considering that it is necessary for a manager to take inspection measures due to the nature of the switchgear when the internal temperature of the switchgear is out of normal temperature and is not recovered in a short time. It is formed of at least one sticker including a and configured on the outer surface of the switchboard adjacent to the area where the temperature sensor is installed;
photographing means for photographing the color of the thermal pigment;
A control device that receives all of the partial discharge signal from the partial discharge sensor, the temperature signal from the temperature sensor, and the video signal from the photographing means to determine the partial discharge and temperature of the switchgear, and controls the operation of the switchgear according to the judgment result. ; and
A remote control server that shares the partial discharge signal from the partial discharge sensor, the temperature signal from the temperature sensor, and the image signal from the photographing means with the control device, and remotely controls the operation of the switchgear according to the judgment result. ,
The control device and remote control server
Considering that the temperature sensor and the thermal pigment are installed inside and outside the switchgear, respectively, the temperature detected by the temperature sensor directly affected by the internal temperature of the switchgear and the color changed by the thermal pigment match each other with a predetermined tolerance. to prevent errors in judgment that may occur due to the difference in the location of the temperature sensor and the thermosensitive pigment,
Based on the video signal of the thermal pigment, it is determined whether the thermal pigment is damaged, and if it is normal, the partial discharge signal, the temperature signal, and the image signal of the thermal pigment are all combined and reflected in the operation of determining whether the switchgear is normal or not,
If it is determined that there is damage to the thermal pigment by the video signal, the video signal is not reflected in determining whether the switchgear is normal or not, and only the partial discharge signal and the temperature signal are combined to determine whether the switchgear is normal or not. A switchgear self-diagnosis system for easy smart monitoring and remote control, characterized in that it is reflected in the operation. The method of claim 1,
The sensor unit, the control device, and the remote control server are wired and wirelessly networked to transmit and receive signals, and the remote control server is an administrator terminal. delete delete delete delete The method of claim 1,
If it is determined that the average temperature inside the switchgear is not normal,
A solenoid driving unit receiving a solenoid driving signal from a control device;
A self-diagnosis system for smart monitoring and easy remote control, characterized in that the solenoid is additionally configured to open the upper cover of the switchgear to release internal heat by being driven by receiving the drive signal of the solenoid driver. delete

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