KR100434760B1 - Apparatus for measuring temperature of a electric power line - Google Patents

Abstract

A junction site temperature measuring apparatus for a power line for large power transmission is disclosed. A thermosensitive tape that changes color with temperature changes is attached to the junction of the two wires, and an optical fiber for providing the color change of the thermosensitive tape to the color filter is installed to face the thermosensitive tape through the protective envelope of the power line. Red, green, and blue LEDs controlled by an AGC circuit are used to provide light to the thermal tape, and the color change of the thermal tape that changes with the temperature change of the junction is measured using a color filter and a photo transistor. Therefore, the temperature change of the junction part can be measured directly, and it is possible to measure temperature at a long distance using an optical fiber. In addition, continuous temperature measurements are possible in real time.

Description

Apparatus for measuring temperature of a electric power line}

The present invention relates to a temperature measurement of a lead for high power transmission. More specifically, the present invention relates to an apparatus for monitoring a heat generation state of the junction site in order to prevent a short circuit of the power line internal wires and an accident associated therewith due to the high heat generated at the junction of the high power transmission power line.

Isolated Phase Bus (IPB) means a method for power transfer from a generator to a boost transformer. That is, it is used as a method for minimizing losses and securing stability in the process of transmitting power generated by the generator to the booster transformer in order to transmit the demand. In this process, the insulation technology of the generator is required due to the increase of the transformer capacity and the power demand, and it is necessary to reduce the loss in the process of transmitting the boost transformer at a large current and to ensure safety, so that the electromagnetic field is limited by This technique is used as a phase separation method.

The above IPB facility uses a power line using a steel wire and is made of aluminum (Al) on the outside of the wire using a steel wire to prevent magnetic shielding and short circuit accidents caused by current flowing through the wire. Cylindrical structures are used to construct the protective sheath, and the air between the conductor and the protective sheath is used as the insulating layer. 1 illustrates a structure of a general high power transmission power line. As shown in FIG. 1, the protective sheath 102 having a cylindrical structure is wrapped around the outside of the conductive wire 100 through which electric power flows. As a result, the internal power line is not visible. Thousands or more of electric currents generally flow through such a large-power transmission power line, and this large-capacity current generates heat in the conductive wire 100. Such heat generation is mainly caused by heat generated by a resistance component inside the conductor 100 and heat generated by a loss component caused by electromagnetic force applied to the conductive wire 100 and the protective shell 102 by the alternating current component. This heat generation is particularly concentrated in the connection portion of the conductive wire 100, that is, the junction portion 104 of the conductive wire 100, because the heat generated by the contact resistance is the largest among various heating requirements. Such contact resistance becomes larger when heat is generated, and when the resistance is increased, a thermal runaway phenomenon occurs in which heat is further increased, and as a result, a short circuit due to melting of the junction part 104 occurs. This short-circuit phenomenon has serious consequences for the power system supplied from the power plant, and the disconnection of the power supply caused by such a short circuit causes a chain problem of the industrial plant, which has a very large ripple effect.

Referring to FIG. 2, in order to solve the above-mentioned problems, the conventionally used method uses a method of continuously measuring the temperature of the protective jacket 102 using an infrared (IR) non-contact thermometer 106. However, in the case of measuring the temperature of the protective outer jacket 102, since the radiation energy generated by the infrared rays generated from the heat generating portion of the inner conductor 100 is emitted to the outside, it is necessary to accurately detect the temperature of the inner conductor 100. Significant problems arise. In the case of estimating the temperature of the inner conductor 100 in reverse due to the temperature change of the protective sheath 102, the result may be very different depending on the influence of the external temperature and the thermal conductivity of the material of the protective sheath 102. As it is necessary to approach and measure IPB facilities in dangerous live conditions, continuous measurement is difficult and the safety of work is deteriorated.

The present invention for solving the above problems is to provide a power line temperature measuring apparatus that can directly measure the temperature change of the junction portion of the conductor at a long distance.

1 is a schematic diagram illustrating the structure of a power line.

2 is a schematic configuration diagram illustrating a conventional power line temperature measuring apparatus.

3 is a schematic diagram illustrating a power line temperature measuring apparatus according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100, 200: conductor 102, 202: protective sheath

104, 204: junction 106: infrared thermometer

206: thermal tape 208: optical fiber

210: light generator 212: color filter

214: Connector 216: Phototransistor

218: signal amplifier 220: analog to digital converter

222: signal processor 224: AGC circuit

226 display unit 228 control unit

The present invention for achieving the above object,

A power line comprising a conductor and a protective sheath for protecting the conductor, wherein the two conductors are attached to the bonded portion to measure heat generated by the power transmission at the bonded portion, and the color changes as the temperature changes. With thermal tape,

An optical fiber installed through the protective sheath of the portion where the thermal tape is attached;

A light generating unit connected to the optical fiber and including red, green, and blue light emitting members, and combining the red, green, and blue light generated from the respective light emitting members to provide the thermal tape to the thermal tape;

A light adjusting unit controlling a color of light provided to the thermal tape by adjusting the degree of emission of the red, green, and blue light emitting members;

Color sensing means connected to the optical fiber and detected by the light and measuring a color of the thermal tape provided through the optical fiber to generate a color signal;

It provides a temperature measuring device comprising a temperature conversion means for converting the color signal provided from the color sensing means to a temperature.

Therefore, since the heat generated at the junction of the conductor is directly measured, more accurate temperature data can be obtained, and the safety accident of the operator due to high heat can be prevented in advance.

Hereinafter, the present invention will be described in detail.

The temperature converting means includes a signal amplifier for amplifying the color signal, an analog-digital converter for converting the color signal amplified by the amplifier into a digital signal, and a signal processor for converting the color signal converted into the digital signal into temperature. It includes. Here, the color signal is a combination signal of red, green, and blue.

Each of the light emitting members uses red, green, and blue light emitting diodes (hereinafter referred to as LEDs), and the light control unit uses an automatic gain control circuit (AGC). do. The AGC circuit selectively adjusts the light generated from each LED according to the temperature signal provided from the signal processor.

The color sensing means comprises a color filter comprising red, green and blue filters, and a photo transistor for generating a color signal in accordance with light provided from the color filter.

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

3 is a schematic diagram illustrating an apparatus for measuring a temperature of a power line according to an embodiment of the present invention.

Referring to FIG. 3, a thermosensitive tape 206 that changes color depending on temperature is attached to a surface of the junction portion 204 of the first conductive line 200a and the second conductive line 200b. The optical fiber 208 is installed to pass through the protective sheath 202 formed of aluminum and provided to protect the first conductive wire 200a and the second conductive wire 200b. One end of the optical fiber 208 is provided to face the thermal tape 206, the other end is connected to the connector 214 is connected to the light generating unit 210 and the color filter 212. The color filter 212 has red, green and blue filters, each of which is connected to the photo transistor 216. The color signal generated from the photo transistor 216 is amplified by the signal amplifier 218 and converted into a digital signal by the analog-to-digital converter 220. Subsequently, the analog to digital converter 220 is connected to the signal processor 222. That is, by measuring the color of the thermosensitive tape 206, which varies with temperature, using the color filter 212 and the photo transistor 216, and converting it into a temperature, the temperature change of the junction 204 is more accurately drawn, It can be measured continuously.

On the other hand, a magnetic field proportional to the current is generated around the conducting wires 200a and 200b through which a large current flows. Generally, when a magnetic field of 1 kG or more is generated, it affects the normal operation of adjacent circuits and sensors. The problem does not appear. In addition, when the electrical circuit is installed in the protective shell of the IPB facility, short circuits between power lines may occur due to signal lines drawn to the outside, and electrical signals transmitted to the outside may also be caused by electromagnetic interference noise (EMI noise) of power lines. ) May cause a signal distortion. The installation of the thermosensitive tape 206, the optical fiber 208, the color filter 212 and the photo transistor 216 can effectively solve the above problems.

The thermosensitive tape 206 attached to the bonding site 204 exhibits a color corresponding to each temperature by the heat generation of the bonding site 204. The optical fiber 208 is installed through the protective sheath 202, a hole having a diameter of about 1mm to 2mm in the protective sheath 202 and one end of the optical fiber 208 is installed so as to face the thermal tape 206. The other end of the optical fiber 208 is provided with a connector 214 connected to the light generating unit 210 and the color filter 212, the light generated from the light generating unit 210 is bonded to the junction through the optical fiber 208 And a thermal tape 206 attached to 204. The light generator 210 includes red, green and blue LEDs, and the driving of each LED is controlled by the AGC circuit 224. Light provided from each of the red, green and blue LEDs is then provided to an optical fiber 208 connected to the connector 214 via a focusing lens (not shown). At this time, since the optical fiber 208 used is an insulator, a short-circuit accident due to the aforementioned external connection conductor does not occur.

In the above exemplary embodiment, the thermal tape 206 is illuminated by using the white light obtained from the three red, green, and blue LEDs to read the color change. At this time, the AGC circuit 224 is used for the stable driving of each of the red, green, and blue LEDs. The output of the AGC circuit 224 is adjusted to adjust the color of the light provided to the thermal tape 206 to a desired color. To change. That is, the AGC circuit 224 is used to combine the LED colors at regular intervals to emit light. First, the approximate color of the whole is judged by white light, and then the reflected light reflected from the thermosensitive tape is measured according to the output while increasing each light source from the off state to the maximum output one by one in the order of red, green, and blue. Do it. In this process, the colors obtained by changing the light sources of red, green, and blue, respectively, show different outputs. That is, considering the case where the color of the thermosensitive tape 206 is changed to red, the output responds only to the change of the output of the red LED. The change in output of green and blue LEDs other than red is always black, i.e. without reflected light, so when each LED is driven separately, the current color is obtained by combining any component of the red, green, and blue signals. It can be a basis for judging cognition. This operation method can be used as a technique for separating accurate red, green, and blue signals from various color changes of the thermal tape 206, and through this, it is possible to identify more accurate colors and detect corresponding temperature changes. to provide.

Briefly, first, the output of the red, green, and blue LEDs is adjusted to produce white light and supply it to the thermal tape 206. At this time, the overall color is obtained. The control intensity of each of the red, green and blue LEDs is set using the color data. Next, the LEDs of the three colors are respectively emitted using the set reference value to obtain a change in color obtained at this time.

In addition, the display unit 226 connected to the signal processor 222 shows the operator the temperature change of the junction portion 204 determined as described above. The data on the temperature change is provided to the controller 228 which performs overall control of power transmission.

According to the present invention as described above, the thermosensitive tape is attached to the junction of the conductive wire, and the color change of the thermosensitive tape that changes with temperature changes at the junction is measured using an optical fiber, a color filter, and a photo transistor, and the temperature data is measured. By converting to, the temperature change of the direct wire can be measured accurately.

By adjusting the color of the light provided to the thermal tape using red, green, and blue LEDs, continuous monitoring of temperature changes in the conductors can be performed in real time, making it easier to maintain large power transmission facilities. And stable power supply is possible.

In addition, it is possible to prevent the safety accident due to the high temperature occurring at the junction site in advance.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims (4)

A power line comprising a conductor and a protective sheath for protecting the conductor, wherein the two conductors are attached to the bonded portion to measure heat generated by the power transmission at the bonded portion, and the color changes as the temperature changes. Thermal tape; An optical fiber installed through the protective sheath of the portion where the thermal tape is attached; A light generator connected to the optical fiber and including red, green, and blue light emitting members, and combining the red, green, and blue light generated from each of the light emitting members to provide the thermosensitive tape through the optical fiber; A light control unit controlling a color of light provided to the thermal tape by controlling the degree of emission of the red, green, and blue light emitting members; Color sensing means connected to the optical fiber, detected by the light, and measuring color of the thermal tape provided through the optical fiber to generate a color signal; And And temperature conversion means for converting a color signal provided from said color sensing means into temperature. The method of claim 1, wherein the temperature conversion means, A signal amplifier for amplifying the color signal; An analog to digital converter for converting the color signal amplified by the amplifier into a digital signal; And And a signal processor for converting the color signal converted into the digital signal into a temperature. The method of claim 1, wherein the color sensing means, Color filters including red, green, and blue filters; And And a photo transistor for generating a color signal according to the light provided from the color filter. The temperature measuring device of claim 1, further comprising a display unit connected to the temperature converting means and showing the temperature.