KR101823007B1 - Eco-friendly switchgear having partial discharge, temperature diagnosis function and iot technology - Google Patents

Abstract

The present invention relates to an eco-friendly distribution board having partial discharge and temperature diagnosing functions and IoT technology, which is configured by a mold way, uses a UHF sensor detecting a partial discharge to minimize a detection error by noises, and maintains a sealing state of the distribution board. To attain the objective, the eco-friendly distribution board having partial discharge and temperature diagnosing functions and IoT technology comprises: an enclosure which is a hexahedron, and has a front door and a back door; and a diagnosis device which is installed within the enclosure, detects a partial discharge and the temperature of internal devices, and diagnoses the same. The diagnosis device comprises: a UHF sensor which detects a partial discharge and a resonance frequency; a temperature sensor which is attached and installed on a measuring part to output the resonance frequency according to changes in the temperature; a relay which receives signals output from the UHF sensor and transmits the same; and a diagnosing device which diagnoses a partial discharge and the temperature based on the signals received from the relay, and transmits the diagnosis result to an external device. The UHF sensor is integrally installed in the enclosure and detects a partial discharge generated inside and the resonance frequency output from the temperature sensor to output the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an ECO-FRIENDLY SWITCHGEAR HAVING PARTIAL DISCHARGE, TEMPERATURE DIAGNOSIS FUNCTION AND IOT TECHNOLOGY,

The present invention relates to an eco-friendly switchboard having a partial discharge, a temperature diagnosis function, and an IoT technology, and more particularly, to a UHF sensor that detects a partial discharge, , A partial discharge capable of maintaining the closed state of the switchboard, a temperature diagnosis function, and an IoT technology.

The term "partial discharge" refers to any part of the power equipment system, such as power receiving equipment installed in various industrial and power system substations, high voltage switchgear, high voltage cable, transformer, GIS (Gas Insulated Switchgear), switchgear, Generally referred to is a corona discharge occurring near the tip of the electrode, a surface discharge occurring along the surface of the insulator, and a void discharge occurring in the pores in the insulator.

It is very important to monitor the abnormality of the power equipment and to monitor the degree of deterioration of the insulator and to predict the repair time, and it is possible to predict and manage such by measuring and monitoring the partial discharge. For this purpose, a partial discharge of various power facilities such as high voltage cable, transformer, gas insulated switchgear (GIS), switchgear, power supply facility, high voltage panel, low voltage panel, motor control panel, Measuring devices are being used.

On the other hand, electric power demand is continuously increasing due to the advancement of industry, and accidents caused by electric power facilities in high voltage cable, transformer, GIS, power receiving equipment and power equipment system are frequently occurring. Such accidents can cause technical losses as well as economic losses. Especially, high-voltage power equipment is regarded as a very important facility not only in the national infrastructure but also in civilian use, and the accident of power equipment is a nationally important issue that affects the damage of human life, direct loss of electric power facilities, .

Partial discharge in electric power equipment is a phenomenon that occurs when insulation deteriorates in electric power equipment, and most of them are generated in the last stage of insulation deterioration, and thus it is evaluated as the best method for deterioration diagnosis. Such a partial discharge has a wide band of the electromagnetic wave signal and is not easy to detect due to surrounding noise. As a detection method, a method using a UHF antenna is proposed.

(UHF partial discharge and temperature monitoring system built-in type high-voltage switchboard, low-voltage switchboard, motor control panel, and distribution board) system is disclosed in Patent Publication No. 10-1426792 as a technique for monitoring a partial discharge using a UHF antenna.

The technique includes a UHF sensor for detecting a partial discharge signal of a switchboard; A partial discharge monitoring device for amplifying and converting the partial discharge signal detected through the UHF sensor into a digital signal, accumulating data, and transmitting the accumulated data to a partial discharge diagnostic device; A temperature sensor for measuring temperature inside the switchboard in real time; A temperature monitoring device for amplifying and converting the temperature data measured through the temperature sensor into a digital signal and transmitting the digital data to a partial discharge diagnosis device; And a partial discharge diagnosis unit for mapping the magnitude and frequency of charge of the partial discharge signal inputted from the partial discharge monitoring apparatus and comparing the converted temperature rise curve based on the temperature data inputted from the temperature monitoring apparatus, Device.

However, since the conventional UHF sensor including the above technology is installed in a region for monitoring the partial discharge and a signal line for transmitting a signal detected from the UHF sensor to the outside must be provided, the UHF sensor is exposed to the air, There is a problem that can be detected by the UHF sensor.

Further, since a signal line must be provided in a state that the inside thereof is filled with an insulating gas (e.g., SF ₆ ) such as a GIS (Gas Insulated Switchgear), it is difficult to maintain the sealing of the insulating gas .

KR 10-1426792 B1 (2014. 07. 30.)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and it is an object of the present invention to provide a UHF sensor capable of detecting a partial discharge generated in a closed space using a mold- And an environmentally friendly switchboard having a partial discharge, a temperature diagnosis function and IoT technology.

Another object of the present invention is to provide an eco-friendly switchboard having a partial discharge, a temperature diagnosis function, and IoT technology, which are installed in a contact manner at a point where temperature monitoring is required, have.

In order to solve the above problems, an eco-friendly switchboard having a partial discharge, a temperature diagnosis function, and an IoT technology according to the present invention includes a housing having a front door and a rear door formed in a hexahedron shape, A diagnostic device for detecting and diagnosing partial discharge and temperature, said diagnostic device comprising: a UHF sensor for detecting a partial discharge and a resonance frequency; A temperature sensor attached to the measurement site and outputting a resonance frequency according to a change in temperature; A repeater for receiving a signal output from the UHF sensor and transmitting the signal; And a diagnostic unit for diagnosing a partial discharge and a temperature based on a signal received from the repeater, and transmitting the diagnosis result to an external device, wherein the UHF sensor is installed integrally with the enclosure, And a resonance frequency output from the temperature sensor is detected and output.

Here, the temperature sensor is directly attached to a bus bar and a transformer requiring temperature monitoring, and is transmitted to the UHF sensor 100 by radio frequency oscillation according to a change in temperature.

At this time, the temperature sensor includes a base plate which is in surface contact with a bus bar or a temperature detection point; An operation power supply module installed on the base plate for outputting operating power from the induction electromotive force inside the switchboard; An interdigital transducer (IDT) electrode for outputting an RF (Radio Frequency) potential having a predetermined frequency to a power source output from the operation power supply module; A crystal module oscillated by an RF potential output from the IDT electrode; An oscillation module for amplifying vibrations generated in the crystal module; And a resonance coil outputting a frequency output from the oscillation module.

The UHF sensor may further include a sensor flange coupled to an outer surface of the enclosure or the enclosure; A sensor support coupled to an inner surface of the sensor flange; A sensor antenna attached to the sensor support; A sensor cover coupled to the sensor flange inside the enclosure or enclosure and sealing the outside of the sensor support and the sensor antenna; And a connector provided on an outer surface of the sensor flange and electrically connected to the sensor antenna to output a signal.

Also, the frequency detected by the sensor antenna is 300 MHz to 1.5 GHz.

According to the present invention, since the UHF sensor, which is constituted by a mold method and detects a partial discharge, is installed, it is possible to maintain the sealed state inside and outside, and thus it is possible to prevent deterioration of insulation efficiency due to leakage of insulated gas.

Further, since the contact with the atmosphere or the insulating gas is blocked, noise or the like can minimize the input, so that reliability of the detected signal can be secured.

1 is a perspective view showing an outline of an environment-friendly power distribution board having a partial discharge diagnosis function and IoT technology according to the present invention.
2 is a side view showing an internal configuration of an environmentally friendly power distribution board having a partial discharge diagnosis function and IoT technology according to the present invention.
3 is a configuration diagram of a diagnostic apparatus applied to an environmentally-friendly switchboard having a partial discharge diagnosis function and IoT technology according to the present invention.
FIG. 4 is a perspective view of a UHF sensor applied to an eco-friendly switchboard having a partial discharge diagnosis function and IoT technology according to the present invention, FIG. 5 is an exploded perspective view of the UHF sensor, and FIG.
7 is a plan view of a sensor antenna according to an embodiment of the present invention applied to an eco-friendly switchboard having a partial discharge diagnosis function and IoT technology.
8 is a configuration diagram of a temperature sensor applied to an eco-friendly switchboard having a partial discharge, temperature diagnosis function, and IoT technology according to the present invention.
9 is a graph showing a range of a resonance frequency according to temperature of a crystal according to an embodiment.

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

The present invention relates to a discharge lamp, a discharge lamp, and a lighting apparatus, which can minimize a detection error due to noise by using a UHF sensor configured to detect a partial discharge, Quot;

FIG. 1 is a perspective view showing the external appearance of an environment-friendly power distribution board having a partial discharge, a temperature diagnosis function, and IoT technology according to the present invention, FIG. 2 is a perspective view of a environment- Fig.

An eco-friendly switchboard having a partial discharge, a temperature diagnosis function, and IoT technology according to the present invention includes a housing (10) in which a front door and a rear door are formed in a hexahedron shape, an electric power equipment installed in the housing (10) And a diagnostic device 20 for detecting and diagnosing the partial discharge and temperature of the devices.

Referring to FIG. 2, the housing 10 includes a front side space portion and a rear side space portion with respect to a center frame, a front door 11 is provided at a front portion of the front space portion, A rear door 12 is provided.

The front door 11 and the rear door 12 are provided with a locking device to prevent the door from being opened by other persons, thereby preventing a safety accident.

In addition, a front safety door is further provided on the inside of the front door 11.

The front door 11 is provided with control circuits such as a power reception and distribution electric power situation in the power distribution panel, an operation button of a breaker, and a protection relay, and the front door 11 is often opened to check the control circuit .

The front safety door is a metal panel as a whole for preventing contact with a connection part provided inside the front door 11 when the front door 11 is opened. The main part is provided with a transparent window so that the main part can be visually confirmed. Accordingly, the user can open the front door 11, and the main connecting portion can be visually confirmed through the transparent window provided on the front safety door while preventing the safety accident by the front safety door.

Next, the configuration inside the switchboard according to the present invention will be described.

2, the power received through the inlet is connected to the load switch 13.

The load breaker switch (LBS) 13 is connected to a bus line that is connected through a bushing passing through the enclosure, and functions to open or energize the power in a no-load state. That is, when a predetermined current is inputted, cut off, and energized in a live wire state, and when an abnormal current flows due to a short circuit in the converter, electricity can be energized for a predetermined period of time and is often used as an inlet switch of a water- I can not. Therefore, the fault current is used for the purpose of preventing the phase failure during fuse blowing by using a power fuse. It is preferable to use a power fuse in combination with a three-pole load switch with a trip device if the load switch has a three-phase load.

A disconnector (DS) may be provided in place of the load switch (13). The disconnecting switch (DS) is for disconnecting the circuit from the temporary power supply for the purpose of checking the equipment, and should never be operated in the live state. The reason is that when the knife switch is opened, an arc is generated between the blade and the clip of the switch, the space is transferred due to the generation of an arc, and a three-phase short circuit is generated, and a risk that a user (operator) It is because.

At the rear end of the load switch (13), a transformer transformer (14) for the instrument is provided.

The meter transformer 14 (metering out fit) performs a function of modifying high-voltage, high-current power to a predetermined power and supplying the power, and connects the integrated watt-hour meter securely in the power distribution board for receiving and distributing high- . In the inside of the transformer transformer for meters 23, PT and CT are combined to transform and degenerate high voltage and high current into low voltage and small current, respectively, so that an integrated watt hour meter can be installed.

A maximum power meter is connected to the meter transformer 14 to indicate the maximum amount of power received.

Also, a surge arrester is connected between the load switch 13 and the meter transformer 14 to ground a surge voltage.

The arrester performs a function of grounding the surge voltage.

Electrical equipment has an insulation strength such as an impulse voltage and an alternating voltage according to the system voltage. If an overvoltage equal to or higher than a predetermined value is applied, the electrical equipment is destroyed by insulation. At this time, there are exceeded impulse voltage and AC voltage, and there are over-voltage due to lightning stroke or circuit opening and closing. Accordingly, when the peak value exceeds the predetermined value, the lightning arrester classifies the current, discharges the overcurrent by the characteristic element (zinc oxide) to the earth through a ground wire in a short time, and blocks the current in the short time It is a device that automatically returns to a normal state.

A vacuum circuit breaker 15 (VCB) is connected to the rear end of the transformer 14 for the meter to shut off power to an abnormal current such as an overload or a short circuit. The vacuum circuit breaker 15 protects the life and load devices by shutting off the circuit in the vacuum interrupter inside the vacuum interrupter by an external protection relay when an abnormal current such as an overcurrent, a short circuit and a ground fault occurs, It is a breaker.

A protective relay is provided as a construction for generating an interrupt signal by the vacuum circuit breaker (15).

The protective relay is connected in parallel with the vacuum circuit breaker to monitor a failure of the power line and generate a trip signal to the vacuum circuit breaker when a power line fails. The overcurrent relay (OCR), the overvoltage relay (OVR) , Under voltage relay (UVR) and ground fault relay (GR). Depending on the design conditions, frequency relays, ratio differential relays, phase relays and selective ground relays can be added.

And a meter transformer 16 connected in parallel with the vacuum circuit breaker to transform a high voltage into a voltage of a certain level to provide the voltage transformer.

The potential transformer (PT) 16 transforms the voltage of the high voltage circuit to a low voltage so that it can be used for various instruments such as a voltmeter, a power meter, a frequency meter, a power factor meter, a protective relay, The secondary side is configured to output a rated voltage of 110V although the secondary side differs depending on the voltage. In this case, a power fuse is installed on the primary side for the purpose of preventing a fault current such as a burnout of the coil to prevent an accident from spreading. However, the power fuse is not intended to protect the transformer 16 for a meter, 16, the power fuse is immediately blown off, thereby separating the transformer 16 from the high-voltage circuit.

And a current transformer 17 is provided for converting the current flowing in the rear end of the vacuum circuit breaker 15 to a current of a predetermined level and providing the current to the protection relay.

The current transformer (CT) 17 is a device used in series connection to a circuit for converting a large current of a high-voltage circuit into a small current. That is, the current that is changed in the current transformer 17 is used as a power source of the ammeter of the switchboard, the current coil of the power system, and the trip coil of the overcurrent relay. It should be noted that if the secondary side is opened while the current flows through the primary coil of the current transformer, a high voltage is generated at the secondary terminal, which causes damage or electric shock.

A mold transformer 18 is installed at the rear end of the circuit breaker 15 to reduce the voltage and current supplied to the power line to a predetermined level and output the voltage and current.

The mold transformer 18 is formed by inserting the main body of the transformer with an epoxy resin. The mold transformer 18 has a small size and a low risk of fire.

Power fuses are installed in the input / output terminals of the mold transformer 18 to block transient currents. Bus bars are provided at the rear ends of the mold transformers 18 to distribute electric power.

And a power factor compensating unit installed in parallel on the front end side of the bus bar for compensating a phase difference between a voltage and a current to improve a power factor.

The power factor compensating unit includes a power capacitor connected to the power line on the power receiving side and an IGBT stack for determining whether the power capacitor operates according to the switching control, A switch signal controller for outputting a switching control signal for determining an operation of the IGBT stack; A voltage controller for comparing a voltage of the power capacitor with a first reference voltage to determine a voltage compensation value; Side power line and a voltage compensation value determined by the voltage control unit, and compensates the power-supply-side current based on the compensated current and the phase detected from the input voltage of the power-receiving side power line, A current command generator for generating a target current to be outputted; And a current controller for detecting a target current generated by the current command generator and a current output from the power factor compensator to generate a compensation current and providing an operation signal to the switch signal controller according to the generated compensation current .

In addition, a series reactor for removing harmonics is provided at a front end of the power factor compensating unit, and a discharge coil installed in parallel between the power capacitor and the series reactor to discharge the residual charge of the power capacitor.

In the above-mentioned structure, in a facility transmitting an extra-high voltage of 154 KVA or more, electric devices such as a breaker, a disconnecting switch, a ground switch, and the like such as a switch, a transformer for a meter, a transformer for a meter, a bus bar, And a GIS (gas insulated switchgear) for insulating and insulating the insulated gas (SF ₆ ) is provided.

That is, the GIS maintains a state in which the electric parts to which a high voltage is applied is kept in a state in which the contact with the outside is blocked, and the insulation is not hurt. The inside of the enclosure is filled with a nonflammable and non-toxic sulfur hexafluoride (SF ₆ ).

In such a GIS, cubic GIS is used not only at high pressure but also at high pressure. That is, a cubicle type GIS in which a circuit breaker and a power bus bar are disposed inside a sealed enclosure of a certain type and the inside thereof is filled with an insulating gas is also used in the cabinet of the switchboard.

Next, the diagnostic apparatus 20 for diagnosing by detecting the partial discharge and the temperature will be described.

FIG. 3 is a diagram illustrating the configuration of a diagnostic device applied to an environmentally-friendly switchboard having a partial discharge, temperature diagnosis function, and IoT technology according to the present invention.

Referring to FIG. 3, the diagnostic apparatus 20 includes a UHF sensor 100, a temperature sensor 200, a repeater 300, and a diagnostic device 400.

The UHF sensor 100 detects a partial discharge and a resonance frequency and detects a partial discharge generated in the housing 10 and outputs the partial discharge to the housing 10. At this time, the resonance frequency is a signal output from the temperature sensor 200, which will be described later.

A plurality of such UHF sensors 100 are provided and integrally installed in the enclosure 10 in which a partial discharge is frequently generated.

In addition, the UHF sensor 101 is integrally installed in a closed compartment of a gas insulated switchgear (GIS) provided therein to detect and output a partial discharge generated inside. At this time, a signal output from the UHF sensor 101 installed in the GIS or the like may be transmitted to the repeater 300.

FIG. 4 is a perspective view of a UHF sensor applied to an environment-friendly switchboard having a partial discharge, a temperature diagnosis function, and IoT technology according to the present invention, FIG. 5 is an exploded perspective view of the UHF sensor, Fig.

4 to 6, a UHF sensor 100 according to the present invention includes a sensor flange 110, a sensor support 120, a sensor antenna 130, a sensor cover 140, and a connector 150 .

The sensor flange 110 is coupled to the outer surface of the enclosure (B or enclosure) and is coupled to the enclosure B by a flange fixing screw 111 passing through a formed hole (not shown).

At this time, a predetermined hole is formed in the enclosure (B) where the sensor flange (110) is installed, and the outer diameter of the sensor flange is formed to be larger than the diameter of the hole formed in the enclosure (B).

The sensor flange 110 is coupled to the enclosure B so that the contact surface between the sensor flange 110 and the enclosure B to seal the inside and the outside of the enclosure B A flange o-ring 113 is installed.

The flange groove 112 is formed in the sensor flange 110 so that the flange o-ring 113 guides the position of the sensor flange 110.

The sensor support 120 is coupled to an inner surface of the sensor flange 110 to support a sensor antenna 130, which will be described later. The sensor support 120 has a central opening and a donut shape.

The central axis of the sensor support 120 and the center axis of the sensor flange 110 may be coaxially mounted and the sensor support 120 may be coupled to the sensor flange 110 by a support coupling screw 121. [ do.

The sensor antenna 130 is attached to the sensor support 120 and detects a frequency generated by the partial discharge.

Partial discharge is a kind of discharge phenomenon, which means insufficient dielectric breakdown that does not intertwine between the electrode and the electrode, which occurs at the pores of the solid insulator, the gas drop of the liquid insulator, the contact interface of the heterogeneous insulator, When such a partial discharge occurs, heat is generated, collision of charged particles, and chemical action by molecules and ions damage the surrounding solid insulator.

Partial discharges are accompanied by frequency, and the area of generated frequency is ultra high frequency (UHF) in the range of 300MHz ~ 1.5GHz for special high voltage power equipment.

Accordingly, the sensor antenna 130 detects the UHF frequency accompanied by the partial discharge.

FIG. 7 is a plan view of a sensor antenna according to an embodiment of the present invention applied to an eco-friendly switchboard having a partial discharge, a temperature diagnosis function, and IoT technology.

The pattern of the antenna is important to detect the microwave in the range of 300 MHz to 1.5 GHz caused by the partial discharge.

Referring to FIG. 7, the sensor antennas 130 are formed as a pair of right and left antennas, and left and right antennas are configured to be point-symmetric.

At this time, the antenna pattern on one side is composed of a fan-shaped base plate 131 and a plurality of side plates 132 extending from the base plate 131 at each side of the base plate 131 and having a predetermined width .

The width of the side plate 132 is smaller as the width of the side plate 132 is closer to the central portion of the side plate 132 and the width of the side plate 132 Are formed to taper in the center direction. The side plates 132 having such a configuration may be provided on each of the left and right sides.

The sensor cover 140 is coupled to the sensor flange 110 inside the enclosure and seals the outside of the sensor support 120 and the sensor antenna 130. The sensor cover 120 includes a sensor support 120, A space for accommodating the antenna 130 is provided.

Here, the sensor cover 140 may be coupled to the sensor flange 110 by a coupling screw. The sensor cover 140 is provided with a through hole through which the cover engaging screw 141 is inserted in the outer circumferential direction of the sensor cover 140, (Not shown).

At this time, a cover groove 142 is formed in the circumferential direction on the contact surface of the sensor cover 140, which is in contact with the sensor flange 110, as a constitution for sealing between the sensor flange 110 and the sensor cover 140 And a cover O-ring 143 is installed in the cover groove 142.

The cover O-ring 143 is compressed to prevent the sensor antenna 130 from being exposed to the inner insulation gas (or air) of the enclosure B while being coupled by the engagement of the cover engagement screw 141 do.

The connector 150 is installed on the outer surface of the sensor flange 110 and is electrically connected to the sensor antenna 130 to output a signal.

That is, the connector 150 outputs the frequency detected by the sensor antenna 130 to the outside. The connector 150 is connected to the left and right antennas constituting the sensor antenna 130, (Not shown).

The temperature sensor 200 is attached to a measurement site where temperature is to be detected and oscillates and outputs the resonance frequency of the crystal generated according to the temperature change. The temperature sensor 200 uses a change in the resonance frequency according to the temperature change.

In addition, if an RF (radio frequency) potential having a constant frequency is applied through an IDT (interdigital transducer) electrode formed on one side of a crystal, a secondary piezoelectric effect is repeatedly generated, and a surface acoustic wave having a predetermined frequency is generated. Here, the crystal is oscillated by the surface acoustic wave to output the resonance frequency, and the resonance frequency output from the crystal is varied in accordance with the temperature change. That is, a predetermined difference occurs between the resonance frequency generated at the set temperature and the resonance frequency oscillated according to the temperature change.

At this time, the power applied to the crystal uses the induced electromotive force derived from the power line, and the resonance frequency generated from the crystal is amplified and output using the resonator.

Accordingly, it is possible to detect the temperature by comparing the oscillated resonance frequency according to the resonance frequency and the temperature change at the set temperature according to the natural vibration of the crystal.

In addition, by applying different resonance frequencies of the crystals included in the temperature sensor 200 and detecting the resonance frequency generated by the applied crystal, it is possible to detect the position where each temperature sensor 200 is installed.

The temperature sensor 200 is directly attached to a bus bar and a transformer requiring temperature monitoring, and oscillates according to a change in temperature, and transmits the frequency to the repeater 300 wirelessly.

FIG. 8 is a diagram illustrating a configuration of a temperature sensor applied to an environmentally-friendly switchboard having a partial discharge, a temperature diagnosis function, and an IoT technology according to the present invention.

8, a temperature sensor 200 according to the present invention includes a base plate 210, an operation power supply module 220, an IDT electrode 230, a crystal module 240, an oscillation module 250, And includes a resonance coil 260.

The base plate 210 has a predetermined plate shape, and a groove 211 is formed on one side of the base plate 210 for screw connection to a bus bar or a temperature sensing object.

The operation power supply module 220 is installed in the base plate 210 and outputs operation power from the induction electromotive force inside the switchboard

The operation power supply module 220 has a structure in which an induction coil is arranged in a spiral manner on a PCB substrate, and the electromotive force induced in proportion to the length of the induction coil is increased. Accordingly, the operation power output from the operation power supply module 220 may further include a resistor and a capacitor to output a uniform operation power according to the power reception and distribution capacity of the switchboard.

An interdigital transducer (IDT) electrode 230 outputs an RF (radio frequency) potential having a constant frequency as a power source output from the operation power supply module 220.

The crystal module 240 is oscillated by the RF potential output from the IDT electrode 230.

Crystal is a kind of device that has the characteristics of piezoelectric effect and is a very precise reference source and is applied to a wide range of electronic devices.

Here, the piezoelectric effect refers to a phenomenon that when a stress is applied to a specific crystalline material (e.g., a crystal or the like), an electric field is generated between the surfaces of the crystalline material in proportion to the mechanical stress of the stress (primary piezoelectric effect) When the electric field is applied between the surfaces of the material, mechanical deformation occurs in the crystalline material (secondary piezoelectric effect), which means that the electric energy and the mechanical energy are mutually deformed.

Accordingly, when the power output from the operation power supply module 220 is applied to the crystal through the IDT (interdigital transducer) electrode 230, the crystal generates a secondary piezoelectric effect repeatedly and generates an elastic wave having a constant frequency Occurs.

The elastic waves resonate the crystal, and the resonance frequency of the crystal has a correlation with the ambient temperature of the crystal.

That is, by analyzing the difference between the fundamental resonance frequency of the crystal and the changed resonance frequency according to the temperature, the temperature can be detected. In addition, the thickness of the crystal is an important factor determining the fundamental resonance frequency of the crystal. In other words, since the resonance frequency can be varied according to the thickness of the crystal, if a crystal having a different resonance frequency is applied to the temperature sensor and the resonance frequency for the temperature sensor at the position where the temperature sensor is installed is previously specified and stored, The position of the detected resonance frequency can be confirmed.

9 is a graph showing a range of a resonance frequency according to temperature of a crystal according to an embodiment.

Referring to FIG. 9, the resonance frequency of the crystal is divided into twelve ranges so that the respective resonance frequencies do not overlap with each other in the range of 425 to 442 MHz.

For example, when the range of the detected resonance frequency is 425.0 to 426.4 MHz, it can be confirmed by the frequency outputted from the first temperature sensor, and the position where the first temperature sensor is installed can be detected.

The oscillation module 250 amplifies the oscillation generated in the crystal 240 and the resonance coil 260 outputs the frequency output from the oscillation module 250.

A protection cap 270 for protecting the operation power supply module 220, the IDT electrode 230, the crystal module 240, the oscillation module 250, and the resonance coil 260 is formed on the base plate 210, Respectively.

The temperature sensor 200 having such a configuration can be easily installed at a position to be detected, operated by a power source generated through an induced electromotive force, and can easily detect the temperature as the resonance frequency of the crystal is outputted in a wireless manner Of course, the position can be grasped according to the natural resonance frequency of the crystal, and the wiring between the temperature sensor and the UHF sensor 100 for detecting the resonance frequency output from the temperature sensor is omitted.

The repeater 300 receives the signal output from the UHF sensor 100 and transmits the signal to the repeater 300. The frequency of the partial discharge detected from the UHF sensor 100 and the resonance frequency of the crystal oscillated from the temperature sensor 200 And outputs it. At this time, an identification code may be assigned to each received frequency and output.

The diagnostic unit 400 diagnoses the partial discharge and the temperature based on the signal received from the repeater 300, and transmits the diagnosis result to an external device.

The diagnostic device 400 receives the high frequency signal detected from the UHF sensor 100 and the temperature sensor 200 and analyzes the received high frequency signal to detect the partial discharge or detect the overheat.

At this time, the diagnostic device 400 may be configured to accumulate (calculate) the partial discharge detection data to determine whether or not the power equipment system is abnormal.

The detection of the temperature in the diagnostic device 400 is performed by receiving the resonance frequency output from the temperature sensor 200 and comparing the resonance frequency at the set temperature according to the natural vibration of the crystal with the resonance frequency oscillated according to the temperature change The temperature can be detected.

In addition, the diagnostic device 400 may be configured to display the determined partial discharge state as an image on a display, or to transmit a detection event to an operator's mobile device or the like when an alarm is detected, partial discharge detection, abnormality, or overheating.

According to the present invention, since the UHF sensor, which is constituted by a mold method and detects a partial discharge, is installed, it is possible to maintain the sealed state inside and outside, and thus it is possible to prevent deterioration of insulation efficiency due to leakage of insulated gas.

Further, since the contact with the atmosphere or the insulating gas is blocked, noise or the like can minimize the input, so that reliability of the detected signal can be secured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Enclosure 20: Diagnostic device
100, 101: UHF sensor 110: sensor flange
120: Sensor support 130: Sensor antenna
140: Sensor cover 150: Connector
200: Temperature sensor 210: Base plate
220: Operation power supply module 230: IDT electrode
240: crystal module 250: oscillation module
260: resonant coil 270: protective cap
300: Repeater 400: Diagnostic

Claims (5)

A distribution board having a housing (10) in which a front door and a rear door are formed in a hexahedron shape and a diagnostic device (20) installed inside the housing (10) for detecting and diagnosing partial discharge and temperature of internal devices,
The diagnostic device (20)
A UHF sensor 100 for detecting a partial discharge and a resonance frequency;
A temperature sensor 200 mounted on the measurement site and outputting a resonance frequency according to a change in temperature;
A repeater 300 for receiving and transmitting a signal output from the UHF sensor 100; And
And a diagnosis unit (400) for diagnosing a partial discharge and a temperature based on a signal received from the relay unit (300) and transmitting the diagnosis result to an external device,
The UHF sensor (100)
And detects and outputs a partial discharge generated in the inner side and a resonance frequency output from the temperature sensor 200,
The temperature sensor (200)
A base plate (210) in surface contact with a bus bar or a temperature detection point;
An operation power supply module 220 installed on the base plate 210 for outputting operating power from the induction electromotive force inside the switchboard;
An interdigital transducer (IDT) electrode 230 for outputting an RF (Radio Frequency) potential having a predetermined frequency to the power output from the operation power supply module 220;
A crystal module 240 oscillating by an RF potential output from the IDT electrode 230;
An oscillation module 250 for amplifying vibrations generated in the crystal module 240; And
A resonance coil 260 for outputting a frequency output from the oscillation module 250;
And an IoT technology. The eco-friendly switchboard according to claim 1,
The method according to claim 1,
The temperature sensor (200)
The temperature sensor is directly attached to a bus bar and a transformer for which temperature monitoring is required and is oscillated in accordance with a change in temperature and is transmitted to the UHF sensor 100 in a wireless manner. Eco-friendly switchboard.
delete The method according to claim 1,
The UHF sensor (100)
A sensor flange 110 coupled to an outer surface of the enclosure or enclosure;
A sensor support (120) coupled to an inner surface of the sensor flange (110);
A sensor antenna 130 attached to the sensor support 120;
A sensor cover 140 coupled to the sensor flange 110 inside the enclosure or enclosure and sealing the outside of the sensor support 120 and the sensor antenna 130; And
A connector 150 installed on an outer surface of the sensor flange 110 and electrically connected to the sensor antenna 130 to output a signal;
And an environment-friendly power distribution board having a partial discharge, temperature diagnosis function, and IoT technology.
The method of claim 4,
Wherein the frequency detected by the sensor antenna (130) is 300 MHz to 1.5 GHz. The eco-friendly switchboard includes the partial discharge, temperature diagnosis function, and IoT technology.

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