KR101535924B1 - Fault diagnosis sensor of hermetic type iron electric power facilities - Google Patents

Abstract

The present invention relates to a fault diagnosis sensor for a hermetically-sealed electric power facility, and more specifically, to a fault diagnosis sensor which is installed on an outer surface of a hermetically-sealed electric power facility to detect a fault in a frequency band of 2 to 4 GHz with a frequency domain sensitivity of -5 dB or below. The external container-type fault diagnosis sensor for a hermetically-sealed electric power facility according to the present invention comprises: a middle patch composed of a left and a right disk, and wherein a circular protrusion unit is formed on a middle lower end thereof; an upper patch disposed on an upper surface of the middle patch and formed in an elliptic shape; and a lower patch bonded on a lower end of the middle patch, composed of a left and a right disk formed in a shape identical to the left and the right disk of the middle patch, and provided with a mounting hole formed on a center thereof. The circular protrusion unit of the middle patch is inserted into the mounting hole of the lower patch. A binding patch is inserted on the circular protrusion unit which penetrates the mounting hole of the lower patch. The middle patch is formed from an alloy material whose dielectric constant is 4.4. The lower patch, the upper patch, and the binding patch are formed from a perfect electrical conductor (PEC).

Description

FIELD OF THE INVENTION [0001] The present invention relates to an enclosure type fault diagnosis sensor for a steel enclosed type electric power facility,

The present invention relates to a fault diagnosis sensor for a steel enclosed type electric power facility, and more particularly, to a fault diagnosis sensor having a characteristic capable of confirming whether there is a fault in the frequency band of 2 to 4 GHz And to provide a diagnostic sensor.

Generally, power equipment used in substation such as gas insulated load switch and gas insulated bus installed in facilities of distribution system is gas insulated equipment which insulates and supports high voltage conductor in sealed metal container filled with insulated gas. If an internal defect exists, the electric field locally increases and a partial discharge occurs.

If such a partial discharge is left untouched, insulation breakdown may be caused and a large accident may be connected. Therefore, it is necessary to detect a partial discharge occurring in the metal container early and take countermeasures.

By detecting such a partial discharge in the form of a signal, it is possible to anticipate the breakdown of the insulation in advance and is regarded as a preventive maintenance method for gas insulation equipment.

Partial discharge in insulating gas is a high-voltage phenomenon in which a rapid pulse signal is generated. Electromagnetic waves generated by this partial discharge are instantaneously radiated into space and propagate through the metal container, and electromagnetic waves are hardly generated from the metal container Do not.

Therefore, there is proposed a partial discharge detecting apparatus of a gas insulated apparatus which detects a signal generated inside a metal container which is a closed container by an external measuring apparatus using a hermetic terminal.

Examples of prior arts for partial discharge detection of gas insulated appliances are described in Japanese Patent No. 10-658820 entitled " Partial Discharge Detection Apparatus for Gas Insulation Equipment "(Patent Document 1) and Patent No. 10-923748 Patent Document 2] and Patent No. 893396 entitled "Partial-discharge Detection Apparatus of Gas Insulation Device Incorporated With a Built-in Sensor" (Patent Document 3) have been proposed.

In the case of Patent Document 1, the electromagnetic wave generated when an internal abnormality occurs in the gas-insulated apparatus is detected by an external measuring apparatus using a high-sensitivity antenna.

That is, the partial discharge detecting apparatus of the gas insulated apparatus as shown in Figs. 1 and 2, since the generated partial discharge signal is very weak and is influenced by external noise, it is possible to satisfy the detection sensitivity and precision of the partial discharge signal The antenna receiver 11 supported by the antenna support 12 is constructed by combining two semicircular plates on a plane in the metal container 17 so that the electromagnetic waves of the partial discharge are detected in a wide band and with high sensitivity.

In this case, since the area of the antenna receiving unit 11 is large, the capacitance C1 of the high-voltage conductor 18 and the antenna receiving unit 11, the capacitance C2 of the flange 20 and the antenna receiving unit 11, So that it is possible to measure the high sensitivity potential in the gas-insulated equipment.

Further, since the dipole antenna having strong directivity is used in the antenna receiving unit 11, it is possible to detect in which part of the partial discharge detecting device installed in the gas insulated apparatus a partial discharge is generated in a wide band by one antenna, There is no necessity of providing an antenna of the antenna.

In addition, the signal detected from the antenna receiving unit 11 is configured to be transmitted in a coaxial structure of the sealing terminal 13, the coaxial sealing terminal 14 and the coaxial cable 15 so that the high- The signal can be transmitted to the measuring apparatus 16 without attenuating the signal of 100 MHz or more received by the partial discharge within the metal container 17 on which the antenna 19 is supported and it is possible to measure up to a high frequency band of several GHz.

Also, by using the antenna receiving unit 11 by being grounded, the antenna itself can be used as the ground potential without being used as a float electrode, so that occurrence of disturbance can be reduced even if the antenna is placed inside the gas insulating apparatus.

However, the technology applied to the detection apparatus is a structure for detecting electromagnetic waves generated during partial discharge by using a dipole antenna having a directivity characteristic using a principle of a micro patch antenna, The microstrip antenna uses a shorting pin to connect the patch and the ground plane. The characteristic of the antenna is determined by the position of the shorting pin placed on the ground plane. The characteristic of the antenna is the area of the ground plane And shape.

Therefore, when the detection device having a shape similar to that of the microstrip antenna is coupled to the metal container 17 of the gas insulation device, the flange 20 corresponding to the ground plane is coupled with the metal container 17, The position of the detection device provided for each section differs depending on the type of the gas insulated apparatus, and the shape of the detection apparatus is different. Therefore, the ground plane of the detection apparatus is changed and the impedance is changed.

Therefore, even if the shape and specification of gas insulated appliances applied to domestic and foreign countries are different, and the same detecting device having a dipole antenna structure is attached according to the model, the ground plane contacting with the flange 2 is not constant, Since the sensitivity is different, the performance can be changed.

In addition, when the antenna receiving unit 11 is simply grounded, the characteristics of the antenna can be changed due to an external factor owing to the current flowing through the coaxial cable 15, and the size of the flange 20 of the detecting device is large, There was also an inconvenience.

As means for solving such a problem, Patent Document 2 and Patent Document 3 are provided.

Fig. 3 shows a detection device of Patent Document 2. Fig.

The detecting device will be schematically described. The detecting device includes an antenna receiving section 101 having two plate-shaped conductive electrodes in a metal container 111, a signal line 102 connected to the conductive electrodes of the antenna receiving section 101, A coaxial type balun 104 and 105 for wrapping and attaching the terminal line 103 at the same size and a signal line 102 connected to the antenna receiving unit 101, And a measuring device 109 connected to the coaxial cable 108 and measuring a signal transmitted from the signal line 102. The signal line 102 is connected to the grounding terminal line 103, Is connected to a terminating load (110) having the same impedance as the impedance of the coaxial cable (108) connected to the coaxial cable (108).

Fig. 4 shows a detection device of Patent Document 3. Fig.

A pair of antenna receiving units 100a and 100b having a hemispherical shape for receiving signals of partial discharges generated in the metal container 17 and positioned symmetrically with respect to each other, A built-in sensor composed of a signal line 102 and a ground line 104 connected to the respective conductive electrodes of the signal transmission line 100b and a coaxial cable 15 for drawing a signal transmitted to the signal line 102 to the outside of the metal container 17, And a measuring device 16 connected to the coaxial cable 15. The antenna receiving units 100a and 100b are installed vertically to the high voltage conductor 19 and the ground line 104 is connected to the coaxial cable 15. [ The connection element 106 having the same impedance as the impedance of the gas sensor 15 is connected to detect the partial discharge of the gas-insulated equipment.

Therefore, the above-described detection devices have the effect of providing a constant sensitivity characteristic regardless of the type of the gas-insulated apparatus by connecting a 50-ohm junction element so as to maintain a constant impedance to the grounding termination line 103 or the grounding line 104, The partial discharge generated by various defects in the metal container can be effectively detected.

However, in the case of the detecting device of Patent Document 2, the antenna receiving portion 101 to which the dipole sensor is applied, the antenna supporting insulator 113 for insulating the coaxial baluns 104 and 105 from the antenna receiving portion 101, And a coaxial cable 108 for connecting the ground terminal line 103 and the signal line 102 for connecting the connector 107 to the antenna receiving unit 101 and the metal container 107 and the measuring device 109 The configuration is complicated and the detection device is relatively large and many parts need to be machined and assembled without any error. However, there is a disadvantage that the performance may be uneven due to differences in machining dimensions and assembly conditions Was.

In the case of the detection device of Patent Document 3, a dipole sensor is used, and hemispherical antenna receiving portions 100a and 100b are arranged to face each other. The antenna receiving portions 100a and 100b are connected to the ground line 104 and the signal line 102 The ground line 104 is connected to the junction element 106 and the signal line 102 is connected to the connector 14 and the metal container 17 is supported while supporting the junction element 106 and the connector 14 The connector 14 is connected to the measuring device 16 through a coaxial cable 15. The antenna 14 is also somewhat complicated in configuration and has a pair of hemispherical antenna receiving portions 100a, 100b, and the size of the detection device is increased.

In addition, since the detection devices have a large size, there is a disadvantage in that a separate hand hole is formed inside the metal container in order to install the detection device in the metal container, and a detection device is installed using the hand hole Especially, since the detection sensitivity of the antenna provides a frequency characteristic of less than -10 dB in a high frequency band of 1 to 1.5 GHz in the frequency band, it is difficult to detect the partial discharge generated by voltage abnormality and to estimate the type and position of the defect .

In order to solve such a problem, the inventor of the present invention has an insulated diagnostic sensor registered as a patent No. 10-1383182 entitled " Insulation Diagnosis Sensor for Gas Insulated Load Break Switch for Processing "(Patent Document 4).

5, a central patch 50 made of an alloy material having a dielectric constant of 2.2 is formed on the upper surface of the lower patch 40 with an electric conductor (PEC) The lower patch 40 and the center patch 50 are formed in a plate shape of an arcuate portion and a straight line portion 42 or 52. The upper patch 60 and the upper patch 60 are made of an electric conductor PEC, The insulating member 60 is provided with a connection portion 62 on one side of the circular ring shaped body 61 and a circular space 63 formed on the inner surface of the body 61, .

Accordingly, in the case of the insulation diagnosis sensor, it is possible to diagnose a fault such as an insulation abnormality or a partial discharge in the electric power facility by installing it on the outer surface of a steel enclosed power facility or on the inner surface of a sealing cap of an insulation gas injection port formed in a metal container, The fault diagnosis of the insulation diagnostic sensor can be effectively performed in a low frequency band of 30 MHz to 1.4 GHz, but it is difficult to diagnose faults in a higher frequency band.

Patent No. 10-658820 "Partial discharge detection device of gas-insulated equipment" Patent No. 10-923748 entitled "Partial Discharge Detection Apparatus of Gas Insulation Equipment" Japanese Patent No. 893396 entitled "Partial Discharge Detection Apparatus of Gas Insulation Equipment with Built-in Sensor & Patent No. 10-1383182 entitled "Insulation Diagnosis Sensor of Gas Insulated Load Break Switch for Processing"

An object of the present invention is to provide a fault diagnosis sensor capable of effectively diagnosing an abnormality in a high frequency band by correcting all the conventional disadvantages and installing the same on the outer surface of a steel enclosed power facility.

The electromagnetic waves due to faults occurring in the power facility are checked for failure through the UHF diagnosis, which has little effect of external noise between 0.3GHz and 1.5GHz.

In the enclosed type electric power equipment, the electromagnetic wave due to the internal failure tends to be shielded by the iron enclosure, but the electromagnetic waves propagate from the seams or connections existing in the iron enclosure, and the second electric wave by the iron enclosure occurs And the frequency of the electromagnetic wave due to such secondary propagation is confirmed at 2 GHz or more.

It is required to have high reliability and stability for operation and maintenance of the currently operated power facilities. Demand for power equipment with preventive diagnosis function that occurs due to deterioration of facilities or unexpected defects is rapidly increasing, and maintenance planning And diagnosis solution.

Accordingly, it is an object of the present invention to provide a high-frequency-band fault diagnosis sensor for a power facility capable of confirming whether a fault has a frequency domain sensitivity of less than -5 dB in a high frequency band of 2 to 4 GHz.

As a means for solving the above problems, the present invention provides an oval top patch on the upper surface of a central patch formed by left and right discs and having a circular protrusion at the lower center of the center, And a circular protrusion of the central patch is fitted to the coupling hole of the lower patch so that the circular patch protrudes through the coupling hole of the lower patch to be fitted and coupled with the binding patch, And an enclosure type fault diagnosis sensor of a power facility is constituted.

In the above, the center patch is made of an alloy material having a dielectric constant of 4.4, and the upper patch and the lower patch and the binding patch are made of an electric conductor (PEC).

The present invention is characterized in that an elliptical upper patch is formed on the upper face of the center patch having a circular protrusion at the lower center of its center and a left and right circular plate having the same shape as the central patch at the lower end of the central patch, The lower patch is joined to the lower patch so that the circular protrusion of the center patch is fitted to the coupling hole of the lower patch and the binding patch is fitted to the circular protrusion passing through the coupling hole of the lower patch so that the enclosure type failure diagnosis sensor of the iron- The center patch is made of an alloy material having a dielectric constant of 4.4 and the upper patch and the lower patch and the binding patch are made of an electric conductor (PEC), so that a fault diagnosis sensor is installed in a steel enclosed power facility enclosure, It is possible to check whether there is a fault in the high frequency band of -5 dB or less in frequency sensitivity.

Figure 1: Example of a conventional detection sensor device
Figure 2: Example of a conventional detection sensor device
Figure 3: Example of a conventional detection sensor device
Figure 4: Example of a conventional detection sensor device
Figure 5: Example of a conventional detection sensor device
Figure 6 is a perspective view of the fault diagnosis sensor of the present invention.
7 is a side view of the fault diagnosis sensor of the present invention.
Figure 8: Plan view of the fault diagnosis sensor of the present invention
9 is a bottom view of the fault diagnosis sensor according to the present invention.
10: sectional view of the fault diagnosis sensor of the present invention
11: exploded view of Fig. 10
12: plan view of upper patch constituting the present invention
13 is a bottom plan view of the center patch constituting the present invention
14 is a plan view of a bottom patch constituting the present invention;
15: Plan view of binding patch constituting the present invention
16: Example of use state of the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration of an enclosure type fault diagnosis sensor of a steel enclosed type electric power facility to be provided in the present invention will be described in detail with reference to the accompanying drawings.

6 to 15 show the configuration of a fault diagnosis sensor 200 installed on the outer surface of a steel enclosed type electric power facility to detect the presence or absence of an electric power facility, and FIG. 16 shows an example of the use state of the fault diagnosis sensor 200 In the operation of the electric power equipment, electromagnetic waves due to faults occurring inside the iron enclosed power equipment are detected by the iron enclosure, and the measurement bandwidth of the fault diagnosis sensor 200 is measured in a high frequency band of 2 to 4 GHz , And the frequency domain sensitivity is -5dB or less.

The configuration of the failure diagnosis sensor 200 is such that an upper patch 300 made of an electric conductor PEC is bonded to the upper surface of a central patch 400 made of an alloy material having a dielectric constant of 4.4 and a lower patch 300 made of an electric conductor PEC The lower patch 500 and the binding patch 600 are bonded to the circular protrusion 410 protruded at the lower end of the center patch 400 in a fitting manner.

The center patch 400 made of an alloy material having a dielectric constant of 4.4 is formed by integrally forming the center left disk 420 and the center right disk 430 having the same radius at a certain interval so that the central left and right disks 420, And a circular protrusion 410 protrudes from the lower end of the center patch 400. The circular protrusion 410 protrudes from the central patch 400,

The radius R of the central left and right discs 420 and 430 is 20 mm and the distance L between the center points C is 20 mm and the thickness T is 3 mm and the radius of the circular protrusion 410 R1) is 2.5 mm, and the height S is 5 mm.

The elliptical upper patch 300 formed of the electric conductor PEC has a length L1 of 25 mm at the center point C1, a distance L2 of 10 mm at the short side, and a thickness T1 of 3 mm at the center point C1 The upper patch 300 having the above configuration is joined to the center of the upper surface of the center patch 400 while connecting the central left and right discs 420 and 430 constituting the center patch 400.

The lower patch 500 formed of the electric conductor PEC is formed by arranging the lower left circular plate 520 having the same radius R2 and the lower right circular plate 530 integrally A concave portion 540 is formed between the lower left and right discs 520 and 530 and a coupling hole 510 is formed at the center of the lower patch 500. [

Therefore, when the lower patch 500 is joined to the bottom surface of the center patch 400, the circular protrusion 410 of the center patch 400 passes through the coupling hole 510 of the lower patch 400.

The radius R2 of the lower central left and right discs 520 and 530 is 20 mm and the distance L3 between the center points C3 is 20 mm and the thickness T2 is 3 mm. The radius R6 of the formed coupling hole 510 is 5 mm.

The circular protrusion 410 of the center patch 400 having the height S of 5 mm passes through the fitting hole 510 of the lower patch 500 and is protruded downward by about 2 mm.

The binding patch 600 formed by the electric conductor PEC is formed in a disk shape and has a binding hole 610 at the center thereof. The binding patch 610 has a circular protrusion 410, the binding patches 600 are bonded to the bottom surface of the lower patch 500.

The outer radius R3 of the binding patch 600 is 8 mm, the inner radius R4 is 5 mm, and the thickness T3 of the binding patch 600 is 2 mm.

The fault diagnosis sensor 200 according to the present invention is installed on the outer surface of a power facility to detect the presence or absence of a fault by detecting an electromagnetic wave caused by a failure occurring in the power facility. And installed in an iron enclosure of a power facility where no sensor is installed.

16 is a diagram showing an example in which the fault diagnosis sensor 200 of the present invention is installed in the gas insulated load switch 70 for processing and then connected to the measuring device 81 through the coaxial cable 82, 80 is completed. Therefore, when an abnormal electromagnetic wave such as an insulation abnormality or a partial discharge is generated in the gas insulated load switch 70 for processing, it is diagnosed.

At this time, as in the case of the gas-insulated load switch 70 for processing, an electromagnetic wave due to a failure occurring in the interior of the iron enclosed type electric power facility tends to be shielded by the iron enclosure, but the electromagnetic wave propagates from the joint or connection portion existing in the iron enclosure , And the secondary wave is generated in the iron enclosure, and the electromagnetic wave frequency due to the secondary wave is confirmed at 2 GHz or more.

Therefore, the failure diagnosis sensor 200 to be provided in the present invention is made of an alloy material having a dielectric constant of 4.4, and has an elliptical shape formed of an electric conductor (PEC) on the upper surface of the central patch 400, And a lower patch 500 composed of lower left and right discs 520 and 530 and a lower patch 500 made of an electric conductor PEC, The binding patch 600 of the central patch 400 is sandwiched by the circular protruding portion 410 formed at the lower end of the central patch 400 so that the frequency band sensitivity of the failure diagnosis sensor 200 in the high frequency band of 2-4 GHz So that it is possible to effectively detect the electromagnetic wave caused by a failure occurring inside the iron enclosed type electric power facility in the iron enclosure.

The configurations and specifications of the upper patch 300, the central patch 400, the lower patch 500 and the binding patch 600 constituting the failure diagnosis sensor 200 according to the present invention are optimized for the function of the failure diagnosis sensor 200 Is an ideal condition to perform.

As described above, by using the fault diagnosis sensor provided in the present invention, it is possible to ensure high reliability and stability in the operation and maintenance of the currently operated electric power facilities, and also to prevent Even if demand for power equipment with diagnostics rapidly increases, it will be able to meet the maintenance, maintenance plan and diagnosis solution.

(200) - Fault diagnosis sensor (300) - Upper patch
(400) - center patch (410) - circular protrusion
(420) - center left disc (430) - center right disc
(440) - Entanglement (500) - Sub patch
(510) - engagement hole (520) - lower left disc
(530) - lower right side original plate (540)
(600) - binding patch (610) - binding ball

Claims (2)

In constructing the enclosure type fault diagnosis sensor of a steel enclosed type electric power facility, an upper patch 300 made of an electric conductor (PEC) is bonded to the upper surface of the central patch 400 made of an alloy material having a dielectric constant of 4.4, The center patch 400 is formed to have the same radius as the center patch 400. The lower patch 500 is made of a conductor PEC and the binding patch 600 is joined to the circular protrusion 410 protruding from the lower end of the center patch 400, The center left circular plate 420 and the center right circular plate 430 are integrally formed so that the concave portion 440 is formed between the central left and right circular plates 420 and 430, The lower patch 500 has a lower left circular plate 520 and a lower right circular plate 530 integrally formed with the same radius as the circular protrusions 410 protrude from the center and the upper patch 300 has an elliptical shape. So that the recessed portion 540 is formed between the lower left and right discs 520 and 530, And the circular protrusion 410 of the center patch 400 is fitted to the coupling hole 510 so that the coupling hole 510 is formed in the coupling hole 510. The binding patch 600 is formed in a disc shape, And a circular protrusion (410) of the center patch (400) is fitted to the coupling hole (610) so as to be coupled to the coupling hole (610). The method of claim 1, wherein a radius R of the central left and right discs 420 and 430 constituting the center patch 400 is 20 mm, a distance L between the center points C is 20 mm, The radius R1 of the circular protrusion 410 is 2.5 mm and the height S is 5 mm and the distance L1 between the center patch C1 and the upper patch 300 is 25 mm The distance L2 on the shorter side is 10 mm and the thickness T1 is 3 mm and the radius R2 of the lower left and right discs 520 and 530 constituting the lower patch 500 is 20 mm and the center point C3 has a radius L3 of 20 mm and a radius R6 of the coupling hole 510 is 5 mm and a thickness T2 is 3 mm and the outer radius R3 of the binding patch 600 is 8 mm, Wherein the radius R4 is 5 mm and the thickness T3 is 2 mm.

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