KR20190055639A - Sensing apparatus for monitoring real-time fault diagnosis of self-generating high pressure transmission dc cable, monitoring system and method for the same - Google Patents

Abstract

According to an embodiment of the present invention, provided is a sensing apparatus for monitoring real-time failure diagnosis of a self-generating high-pressure power transmission DC cable which comprises: at least one sensor installed at the outside of a high-pressure power transmission DC cable and driven by a voltage obtained from a thermoelectric energy harvester driven by a temperature difference with the deep seafloor; a processor using a sensing value received from the at least one sensor to generate information related to the high-pressure power transmission DC cable including a partial discharge position of the high-pressure power transmission DC cable; and a communication interface unit transmitting information on the partial discharge position of the high-pressure power transmission DC cable in order to monitor a failure of the high-pressure power transmission DC cable in real time.

Description

TECHNICAL FIELD [0001] The present invention relates to a sensing apparatus, a monitoring system, and a method for real-time fault diagnosis monitoring of a self-generating high-voltage transmission DC cable.

The present invention relates to a sensing device, a monitoring system, and a method for real-time fault diagnosis monitoring of a self-generating transmission cable, in which a sensor is driven by using thermal energy generated from a transmission cable, and based on the generated sensing information, Monitoring system, and method for real-time fault diagnosis monitoring of a self-generating transmission cable for monitoring a power supply system.

Partial discharge (PD) is the main cause of failure of high-voltage transmission DC cable (HVDC), which is a local electric discharge phenomenon caused by cable insulation system. Eventually leading to dielectric breakdown. Therefore, since partial discharge best represents information on insulation deterioration, and partial discharge deterioration generally occurs in the final stage of insulation deterioration, diagnosis of deterioration of cable through partial discharge measurement is not only accurate in diagnostics, The reliability aspect and the repair and replacement timing determination.

Most conventional partial discharge detection sensing techniques are capable of detecting only partial discharges that occur within a certain distance of a cable termination or connection. It is necessary to install the partial discharge sensor at a predetermined interval in the cable in order to determine the maintenance replacement time through the partial discharge monitoring over the entirety of several km to several tens of km of underground or underground cable.

Accordingly, there is a need to improve the sensitivity and improve the accuracy of partial discharge position detection through development of a multi-sensor system for partial discharge generated in the HVDC cable through the present invention.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus and method for real-time and on-line detection of an error such as a partial discharge of a transmission cable.

The present invention also aims to provide a stable power supply by sufficiently driving a sensing device necessary for monitoring a transmission cable by using power generated by integrating a plurality of thermoelectric energy harvesters.

It is also intended that the power generated by the thermoelectric energy harvester can be used as a power source for driving a communication device capable of transmitting and receiving data collected by sensors.

A sensing device for real-time fault diagnosis monitoring of a self-generating transmission cable according to an embodiment of the present invention includes at least one sensor driven by a voltage obtained from a thermoelectric energy harvester installed at the outer periphery of a transmission cable, A processor for generating the transmission cable related information using the received sensing value, and a communication interface unit for transmitting the transmission cable related information.

The monitoring system for monitoring a transmission cable according to another embodiment of the present invention includes at least one sensor driven by a voltage obtained from a thermoelectric energy harvester installed at the outer periphery of a transmission cable, And a communication interface unit for transmitting the transmission cable related information to the monitoring device, wherein the transmission cable related information received from the sensing device through the communication interface unit is transmitted to the monitoring device And a monitoring device for outputting the transmission cable related information received from the communication device.

A method for monitoring a real-time fault diagnosis of a self-generating high-voltage transmission DC cable according to another embodiment of the present invention includes a step of converting a waste heat emitted from a high voltage transmission DC cable (HVDC) into electric energy by a thermoelectric energy harvester, The sensor installed on the cable is driven using the electric energy converted from the thermoelectric energy harvester to diagnose the failure of the high-voltage transmission DC cable and to detect the corresponding high-strength, a processor detects the failure diagnosed by the sensor, Generating information about an advantage, and communicating with the monitoring device, wherein the communication interface unit is operable to send information about the failure and high power generated by the processor to the monitoring device.

According to the embodiment of the present invention, it is possible to detect errors such as partial discharge of the transmission cable in real time and on-line, thereby ensuring reliability in error detection.

In addition, it is possible to sufficiently drive the sensing device necessary for monitoring the transmission cable by using the generated power by integrating a plurality of thermoelectric energy harvesters, so that the power can be stably supplied.

The power generated by the thermoelectric energy harvester may also be used as a power source for driving a communication device capable of transmitting and receiving data collected by the sensors.

1 is a block diagram of a real-time fault diagnosis monitoring system for a self-generating transmission cable according to an embodiment of the present invention;
2 is a view for explaining a thermoelectric energy harvester and sensing device according to an embodiment of the present invention.
3 is a detailed block diagram of a thermoelectric energy harvester according to an embodiment of the present invention
4 is a block diagram of a sensing apparatus 100 according to an embodiment of the present invention.
5 is a flow chart of a real-time fault diagnosis monitoring method for a self-generating high-voltage transmission DC cable according to an embodiment of the present invention

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, a sensing apparatus and a monitoring system for real-time fault diagnosis monitoring of a self-generating transmission cable according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a monitoring system for monitoring transmission cable according to an embodiment of the present invention.

1, the real-time fault diagnosis monitoring system 1 of the self-generating transmission cable according to the embodiment of the present invention includes a sensing device 100, a thermoelectric energy harvester 200, a communication device 300, And a monitoring device (400).

As shown in Figs. 1 and 2, the thermoelectric energy harvester 200 is installed in the outer circumference of the transmission cable and is wrapped around the transmission cable. The thermal energy harvester 200 converts the thermal energy harvested in the transmission cable into electric energy, . For example, the thermoelectric energy harvester 200 can convert waste heat emitted from a high voltage transmission DC cable (HVDC) into electrical energy. More specifically, the thermoelectric energy harvester 200 is provided in a hollow shape closely contacting the outer circumference of the high-voltage transmission DC cable, and is converted into electric energy using the temperature difference between the waste heat emitted from the high-voltage transmission DC cable and the external deep- can do. The detailed configuration of the thermoelectric energy harvester 200 will be described in FIG.

The sensing device 100 is driven by the voltage obtained from the thermoelectric energy harvester 200. The sensing device 100 according to an embodiment of the present invention may include one or a plurality of sensors 110 as shown in FIG. 2, and a sensor 110 installed on a high-voltage transmission DC cable may be connected to a thermoelectric energy harvester 200 ), The sensing device 100 can generate the high voltage transmission DC cable related information using the sensing value.

The sensor 110 can be driven using the electric energy converted from the thermoelectric energy harvester 200, and the failure of the high-voltage transmission DC cable (HVDC) can be diagnosed and the corresponding failure point can be detected. More specifically, at least one of voltage, current, partial discharge, ambient temperature, and vibration at the point where the sensor 110 is installed on the high-voltage transmission DC cable can be detected. The high voltage transmission DC cable related information according to the embodiment includes information on the partial discharge of the high voltage transmission DC cable generated by the processor 130, the partial discharge position, ambient temperature abnormality detection information, tilt abnormality information, voltage or current abnormality information, Detection information, and the like. In addition, the sensing device 100 may generate error information of the sensor 110 itself, that is, information on the strength or the abnormality of the sensor itself by using the sensing value. The generated transmission cable-related information and the error information of the sensor itself can be transmitted to the monitoring device 400 through the communication device 300. The detailed configuration of the sensing device 100 will be described in detail in FIG.

As shown in FIG. 2, at least one of the sensing device 100 and the thermoelectric energy harvester 200 may be formed in a hollow shape in close contact with the outer circumference of the transmission cable. 2, the sensing device 100 and the thermoelectric energy harvester 200 are both hollow. However, the scope of the present invention is not limited thereto, and the sensing device 100 and the thermoelectric energy harvester 200 Any one of which may be embodied in a hollow form.

The communication device 300 mediates communication between the sensing device 100 and the monitoring device 400 and transmits at least one of the transmission cable related information received from the sensing device 100 and the error information of the sensor itself to the monitoring device 400 ). The communication method performed between the sensing device 100 and the monitoring device 400 may include various types of wired / wireless communication methods. Specifically, when the communication device 300 is connected to the sensing device 100 and the monitoring device 400 through a cable, a line, or a power line to perform a wired communication, or a wireless communication device including a wireless communication device Communication can be performed. In particular, according to an embodiment of the present invention, the sensing device 100 can perform duplex communication with the communication device 300 by multi-channels. Then, communication can be performed by a method based on a Modbus protocol (Modbus Protocol).

The monitoring device 400 may be, for example, a data acquisition and analysis computer, and may include a receiving unit, a control unit, and an output unit (not shown). At least one of the transmission cable related information received from the communication device 300 and the error information of the sensor itself. The sensing value itself may also be output through the monitoring device 400. [

As shown in FIG. 1, the sensing device 100 may be attached to a thermoelectric energy harvester 200 and connected to the thermoelectric energy harvester 200 in one pair. The monitoring system for monitoring the transmission cable of the present invention may include a plurality of (100 (1), 100 (2) ... 100 (n)) and a plurality of thermoelectric energy harvesters 200 (1 ), 200 (2) ... 200 (n) may be spaced apart at equal intervals.

2 is a perspective view of the thermoelectric energy harvester 200 and the sensing device 100 surrounding the outer periphery of the transmission cable.

2, the thermoelectric energy harvester 200 may be implemented as a plurality of integrated circuits as shown in FIG. 3, and the sensing device 100 may include a plurality of sensors 100 and a processor 130 .

3 is a configuration diagram of a thermoelectric energy harvester 200 according to an embodiment of the present invention.

3, the thermoelectric energy harvester 200 includes a rectifying unit 210, a switch 220, a charging unit 230, a maximum power point tracking unit 240, a charge control unit 250, 260).

The rectifying unit 210 rectifies the AC voltage supplied from the energy source to a DC voltage. To this end, the rectifying part 210 receives energy from an energy source (for example, a piezoelectric transducer, a vibration element, and a thermoelectric conversion element).

The switch 220 is turned on / off by the control signal SW1 output from the maximum power point tracking unit 240 to control the connection between the rectifying unit 210 and the charging unit 230.

The charging unit 230 is connected to the rectifying unit 210 through the switch 220 and charges the output voltage of the rectifying unit 210.

The maximum power point tracking unit 240 tracks the maximum power point of the output voltage of the rectifying unit 210. That is, the voltage when the output voltage of the rectifying section 210 is at the maximum is found. The maximum power point tracking unit 240 is selectively connected between the rectifying unit 210 and the charging unit 230. The maximum power point tracking unit 240 differentiates the output voltage VRECT of the rectifying unit in the first connected state, And controls the output voltage of the rectifying section. At this time, in the first connection state, the switch 220 is opened, the rectifying part 210 and the charging part 230 are disconnected, and the maximum power point tracking part 240 is switched by the switch inside the maximum power point tracking part 240, Is connected to the rectifying unit 210.

The charge control unit 250 compares the output voltage of the rectifying unit 210 with the maximum power point voltage traced by the maximum power point tracking unit 240 and controls the operation of the charging unit 230 based on the comparison result. For example, if the rectified voltage is lower than the maximum power point voltage as a result of the comparison, charging is temporarily stopped to raise the rectified voltage, and conversely, charging is continuously performed to lower the rectified voltage. To this end, the charge controller 250 outputs control signals PH1, PH2 PH3, and PH4 for controlling ON / OFF of the transistors serving as switches in the charger 230. The charge controller 250 may control the voltage charged in the charger 230 to be transmitted to the sensing device 100 through the voltage interface 260.

 The thermoelectric energy harvester 200 according to the embodiment of the present invention includes a booster circuit unit (not shown), and is connected to the sensor 110 by electric energy converted by the thermoelectric energy harvester 200, The electric energy can be boosted and provided to the sensor 110 in accordance with a cold start method for enabling the electric motor 110 to be driven immediately.

4 is a block diagram of a sensing device 100 in accordance with an embodiment of the present invention.

The sensing device 100 according to an embodiment of the present invention may include one or more sensors 100, a sensor interface unit 120, a processor 130, a communication interface unit 140, a memory 150, a status display unit 160 A power supply unit 170, and the like.

The sensor 100 may include a radio frequency current transducer (RFCT) sensor, a current sensor, a voltage measurement sensor, an ultrasonic sensor, a gyro sensor, a temperature sensor, and the like. 120 to the processor 130. Particularly, according to the embodiment of the present invention, the partial discharge may be detected through the RFCT sensor and the corresponding information may be transmitted to the processor 130. For example, the current sensor and the gyro sensor can be measured every 10 ms, the voltage can be measured every 50 ms, and the temperature sensor can be measured every 1 s. The gyro sensor can be processed by FFT (Fast Fourier Transform), and the low-pass filter can be designed for the temperature sensor.

The processor 130 generates transmission cable related information using the sensing value received from the sensor 100. For example, the transmission cable related information may include whether or not the transmission cable is partially discharged, a partial discharge position, ambient temperature abnormality detection information, slope abnormality information, voltage or current abnormality information, and vibration abnormality detection information. The processor 130 may also generate information on the presence or absence of an abnormality of the sensor itself using the sensing value received from the sensor 100. [ Partial discharging of the transmission cable can be achieved by using heat (HEAT), electromagnetic radiation, dielectric loss, chemical reaction, current pulse, acoustic measurement ≪ / RTI > Information on the transmission cable related information generated by the processor 130 or information on the abnormality of the sensor may be transmitted to the communication device 300 through the communication interface unit 140. [ More specifically, information about the failures and high advantages generated by the processor 130 may be transmitted to the monitoring device 400 via the communication interface 140 and the communication device 300.

The memory 150 stores all information necessary for driving the sensing device 100. [ Specifically, it may store sensing value, transmission cable related information, and information on whether or not the sensor is abnormal. The threshold information, which is a criterion for determining whether the transmission cable is partially discharged, the partial discharge position, the ambient temperature abnormality detection information, the tilt abnormality information, the voltage or current abnormality information, the vibration abnormality detection information, 150). Therefore, when the threshold information stored in the memory 150 is deviated from the threshold information, it is possible to detect whether the transmission cable is partially discharged, partial discharge position, ambient temperature abnormality detection information, tilt abnormality information, voltage or current abnormality information, Information on the presence or absence of abnormality of the sensor itself, and the like.

The status display unit 160 may include a status check LCD or a status display LED for checking an abnormal condition when an abnormality occurs in the sensing device 100. [ For example, if the transmission cable is partially discharged, the corresponding status may be displayed on the LCD.

The power unit 170 manages the power of the sensing device 100 and can separately store and manage information about the power charged from the thermoelectric energy harvester 200.

5 is a flowchart illustrating a method of monitoring a real-time fault diagnosis of a self-generating high-voltage transmission DC cable according to an embodiment of the present invention.

As shown in FIG. 5, the thermoelectric energy harvester 200 according to the embodiment of the present invention can convert waste heat emitted from a high-voltage transmission DC cable (HVDC) into electric energy (S510). More specifically, the thermoelectric energy harvester 200 is installed in a hollow form closely attached to the outer periphery of the high-voltage transmission DC cable, and uses the temperature difference between the waste heat emitted from the high-voltage transmission DC cable and the external deep- / RTI > In order to enable the sensor 110 to be driven immediately by the electric energy converted by the thermoelectric energy harvester 200 even in the fully discharged state of the battery, And may be configured to step up and provide it to the sensor 110.

The sensor 110 installed in the high-voltage transmission DC cable is driven by using the electric energy converted from the thermoelectric energy harvester 200 to diagnose the failure of the high-voltage transmission DC cable and to detect the corresponding high voltage (S520). More specifically, at least one of voltage, current, partial discharge, ambient temperature, and vibration at the point where the sensor 110 is installed in the high voltage transmission DC cable can be detected.

The processor 130 may generate information about the fault diagnosed by the sensor 110 and the detected fault. More specifically, the processor 130 can generate at least one or more of the partial discharge of the high voltage transmission DC cable, the partial discharge position, the ambient temperature abnormality detection information, the slope abnormality information, the voltage or current abnormality information, (S530).

Then, the communication interface unit 140 may transmit the information about the failure and the high-level generated by the processor 130 to the monitoring apparatus 400 (S540).

The features, structures, effects and the like described in the embodiments are included in one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (16)

At least one sensor installed at an outer periphery of the high voltage transmission DC cable and driven by a voltage obtained from a thermoelectric energy harvester driven by a temperature difference with the deep sea bed;
A processor for generating the high voltage transmission DC cable related information including the partial discharge position of the high voltage transmission DC cable using the sensing value received from the at least one sensor; And
And a communication interface for transmitting the partial discharge position information of the high-voltage transmission DC cable for real-time monitoring of the failure of the high-voltage transmission DC cable. The sensing device for real-time fault diagnosis monitoring of the self- .
The method according to claim 1,
Wherein the high voltage transmission DC cable related information includes at least one of a partial discharge of the high voltage transmission DC cable, ambient temperature abnormality detection information, tilt abnormality information, voltage or current abnormality information, or vibration abnormality detection information, A sensing device for real-time fault diagnosis monitoring of cable.
The method according to claim 1,
Wherein the processor further generates information related to an abnormality of the at least one sensor using the sensing value received from the at least one sensor.
The method according to claim 1,
Wherein the thermoelectric energy harvester is stepped up using a cold start method driven by the energy hobbed in the initial full discharge state, and for real-time fault diagnosis monitoring of the self-generating high voltage transmission DC cable.
The method according to claim 1,
Wherein the sensing device performs multichannel duplex communication with the communication device through the communication interface part. 2. A sensing device for real-time troubleshooting diagnosis of a self-generating high-voltage transmission DC cable.
The method according to claim 1,
Wherein the sensing device is attached to the thermoelectric energy harvester and is connected to the thermoelectric energy harvester in one pair, the sensing device for real-time fault diagnosis monitoring of the self-generating high voltage transmission DC cable.
The method according to claim 6,
Wherein at least one of the sensing device and the thermoelectric energy harvester is formed in a hollow shape closely attached to an outer periphery of the high-voltage transmission DC cable, and for real-time failure diagnosis monitoring of the self-generating transmission cable.
At least one sensor installed at an outer periphery of the high voltage transmission DC cable and driven by a voltage obtained from a thermoelectric energy harvester driven by a temperature difference with the deep sea floor, And a communication interface unit for transmitting the partial discharge position information of the high-voltage transmission DC cable for real-time monitoring of the failure of the high-voltage transmission DC cable. A sensing device including;
A communication device for relaying the partial discharge position information of the high voltage transmission DC cable received from the sensing device through the communication interface; And
A monitoring device for outputting the partial discharge position information of the high voltage transmission DC cable received from the communication device; Time fault diagnosis monitoring system of a self-generating high-voltage transmission DC cable.
9. The method of claim 8,
Wherein the sensing device is attached to the thermoelectric energy harvester and connected to the thermoelectric energy harvester in one pair.
10. The method of claim 9,
Wherein at least one of the sensing device and the thermoelectric energy harvester is implemented as a hollow type in close contact with the outer periphery of the high-voltage transmission DC cable, and the real-time failure diagnosis monitoring system of the self-generating high voltage transmission DC cable.
10. The method of claim 9,
A plurality of sensing devices and a plurality of thermoelectric energy harvesters,
Each of the sensing devices connected in one pair and each of the thermoelectric energy harvesters are spaced apart at the same interval, and a real-time fault diagnosis monitoring system of the self-generating high-voltage transmission DC cable.
Converting a waste heat emitted from a high voltage transmission direct current cable (HVDC) into electric energy by a thermoelectric energy harvester;
Detecting a failure of the high-voltage transmission DC cable by detecting a sensor installed on the high-voltage transmission DC cable using electric energy converted from the thermoelectric energy harvester,
The processor generating information about the fault diagnosed by the sensor and the detected fault; And
And the communication interface unit transmits information on the failure and high-strength generated by the processor to the monitoring device.
13. The method of claim 12,
The step of converting the waste heat emitted from the HVDC into electric energy by the thermoelectric energy harvester includes the steps of:
Wherein the thermoelectric energy harvester is installed in a hollow form closely attached to the outer periphery of the high voltage transmission DC cable and is converted into electric energy by using a temperature difference between the waste heat discharged from the high voltage transmission DC cable and the temperature of the outer deep water tank. A real - time fault diagnosis monitoring method of self - generating high voltage transmission DC cable.
13. The method of claim 12,
The step of converting the waste heat emitted from the HVDC into electric energy by the thermoelectric energy harvester includes the steps of:
In order to enable the sensor to be driven immediately by the electric energy converted by the thermoelectric energy harvester even in the fully discharged state of the battery, the step-up circuit part boosts the electric energy in a cold start manner and provides the electric energy to the sensor Wherein the power supply is connected to the power supply.
13. The method of claim 12,
Wherein the sensor installed in the high-voltage transmission DC cable is driven using the electric energy converted from the thermoelectric energy harvester to diagnose the failure of the high-voltage transmission DC cable and to detect the high-
And detecting at least one of voltage, current, partial discharge, ambient temperature, and vibration at a point where the sensor is installed in the high-voltage transmission DC cable.
13. The method of claim 12,
Wherein the step of the processor generating information about the fault diagnosed by the sensor and the detected fault is:
Wherein the processor is configured to generate at least one of a partial discharge of the high voltage transmission DC cable, a partial discharge position, ambient temperature abnormality detection information, slope abnormality information, voltage or current abnormality information, and vibration abnormality detection information A real - time fault diagnosis monitoring method of self - generating high voltage transmission DC cable.

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