KR101285146B1 - Gas insulated apparatus partial discharge detecting sensor and detecting apparatus by its sensor - Google Patents

Abstract

PURPOSE: A partial discharge detection sensor of a gas insulation device and a detection device using the sensor are provided to be easily installed in a metal container through miniaturization. CONSTITUTION: A detection sensor includes a conical patch (40), a circular patch (50), an annular patch (60), and a support (70). The conical path connects apexes formed on both sides by an inclined plane (44). The circular patch is formed in a circular shape at the both apexes. The annular patch is formed in a ring shape at the edge of the circular patch. The support integrates the conical patch, the circular patch, and the annular patch. The conical patch protrudes from the upper part of the support, and a protrusion (41) on the lower end of the conical patch protrudes from the lower part of the support. The support is composed of alloy materials with the permittivity of 2.2. The conical patch, the circular patch, and the annular patch are made of electric conductors (PEC).

Description

GAS INSULATED APPARATUS PARTIAL DISCHARGE DETECTING SENSOR AND DETECTING APPARATUS BY ITS SENSOR}

The present invention relates to a partial discharge detection sensor and a detection device using a sensor of a gas insulated device. In particular, the detection sensor is configured as a conical monopole sensor, while miniaturizing and reducing the weight and designing the structure of the detection sensor under optimal conditions. It is possible to detect the partial discharge of the gas insulated device generated at high sensitivity with high sensitivity, and to ensure the reliability and stability in the operation of power equipment such as a gas insulated switchgear or transformer using high pressure gas as an insulating medium. Of course, the type and location of the defects can be accurately detected.

In general, power equipment used in substations such as gas insulated switchgear, gas heating bus, gas insulated transformer, etc. is a gas insulated device that insulates high voltage conductors in a sealed metal container filled with insulating gas. If a defect is present, a partial electric discharge occurs due to a high electric field locally.

If the partial discharge generated in this way is left as it is, it may lead to insulation breakdown and lead to a major accident. Therefore, it is necessary to find a partial discharge occurring inside the metal container early and take countermeasures.

By detecting such partial discharge in the form of a signal, it is possible to predict the breakdown in advance and it is important as a preventive maintenance method of the gas insulated device.

Partial discharge in the insulation gas is a high voltage phenomenon in which a sudden pulse current is generated. The electromagnetic waves generated by the partial discharge are radiated into the space at the moment and propagate in the metal container. Do not.

Therefore, a partial discharge detection device of a gas insulated device has been proposed which detects a signal generated inside a metal container, which is a sealed container, by an external measuring device using an airtight terminal.

For example, the Korean Patent No. 658820, "Partial discharge detection device for gas insulated device," detects electromagnetic waves generated when an internal abnormality of the gas insulated device is detected by an external measuring device using a highly sensitive antenna.

That is, the partial discharge detection device of the gas insulated device as shown in Figs. 1 and 2 can satisfy the detection sensitivity and precision of the partial discharge signal because the generated partial discharge signal is very weak and influenced by external noise. Since the antenna receiver 11 supported by the antenna support 12 is configured by combining two semicircle plates on a plane in the metal container 17, electromagnetic waves of partial discharge are detected with wideband and high sensitivity.

In this case, since the area of the antenna receiver 11 is large, the capacitance C1 of the high voltage conductor 18 and the antenna receiver 11 and the capacitance C2 of the flange 20 and the antenna receiver 11 are increased. Increasing the value of the electrode enables high sensitivity potential measurement in gas insulated equipment.

In addition, since the dipole antenna having a high directivity is used in the antenna receiver 11, a single antenna can detect a wide area of the partial discharge detection device installed in a large number of gas insulated devices by a single antenna. It is economical because there is no need to install 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 in the metal container 17 on which the electrode 19 is supported and the measurement can be performed up to a high frequency band of several GHz.

In addition, by grounding the antenna receiver 11, it is possible to use the antenna itself as a ground potential without using the float electrode, so that the occurrence of disturbance can be reduced even when placed inside the gas insulator.

However, the technique applied to the detection device is a structure that detects electromagnetic waves generated during partial discharge by using a dipole antenna having a directivity characteristic using a principle of a micro strip patch antenna. The microstrip antenna uses shorting pins to connect the patch to the ground plane, and the characteristics of the antenna are determined by the position of the shorting pin placed on the ground plane. And shape.

Therefore, when a detection device having a shape similar to that of the microstrip antenna is installed to be coupled to the metal vessel 17 of the gas insulated device, the flange 20 corresponding to the ground plane is coupled to the metal vessel 17 to the ground plane. In addition, since the position of the detection device installed in each section is different according to the type of the gas insulator, and the shape is also different, the ground plane of the detection device is changed, the impedance is changed.

Therefore, the shape and specifications of gas insulators applied at home and abroad are different, and even if the same detection device having a dipole antenna structure is attached according to the model, the grounding impedance of the gas insulator is not constant, so the grounding impedance is changed. Sensitivity is different so performance can vary.

In addition, when the antenna receiver 11 is simply grounded, the characteristics of the antenna can be changed by external factors due to the current flowing through the coaxial cable 15, and the flange 20 of the detection device is large and heavy. There was also an inconvenience.

As a means to solve this problem, Korean Patent No. 923748 (filed on July 3, 2007) "Partial discharge detection device for gas insulation equipment" and Korean Patent No. 833396 (filed on February 11, 2007) "Internal sensor Has been provided with a partial discharge detection device for a gas insulated device.

3 shows a detection apparatus of patent 923748.

When the detection device is schematically described, an antenna receiver 101 having two plate-shaped conductive electrodes in the metal container 111, a signal line 102 and ground connected to the conductive electrodes of the antenna receiver 101, respectively, The signal generated inside the metal container 111 is externally transmitted to the outside through the coaxial balance 104 and 105 and the signal line 102 connected to the antenna receiver 101. And a measuring device 109 connected to the coaxial cable 108 to be drawn and the coaxial cable 108 to measure a signal transmitted from the signal line 102, and a signal line 102 to the ground termination line 103. The terminal load 110 having the same impedance as that of the coaxial cable 108 connected thereto is connected to detect partial discharge of the gas insulated device.

4 shows a detection apparatus of Patent No. 893396 invented and registered by the inventor of the present application.

When the detection device is schematically described, a pair of antenna receivers 100a and 100b having a hemispherical shape which receive signals of partial discharge generated in the metal container 17 and are located symmetrically with each other, and the antenna receiver 100a Built-in sensor consisting of a signal line 102 and a ground line 104 connected to each conductive electrode of the (100b) and the coaxial cable (15) for drawing the 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, wherein the antenna receivers 100a and 100b are installed perpendicular to the high voltage conductor 19, and the coaxial cable is connected to the ground wire 104. The junction element 106 equal to the impedance of (15) is connected so as to detect partial discharge of the gas insulated device.

Therefore, the detection devices have the effect of having a constant sensitivity characteristic irrespective of the type of the gas insulated device by connecting a 50 kW junction element to maintain a constant impedance to the ground termination line 103 or the ground line 104. In this way, the partial discharge caused by various defects in the metal container can be effectively detected.

However, in the case of Patent No. 923748, an antenna support insulator 113 and a termination load 110 to insulate the antenna receiver 101, the coaxial balance 104 and 105 and the antenna receiver 101 to which the dipole sensor is applied. And a coaxial cable 108 for connecting the ground terminal 103, the signal line 102, the metal container 107, and the measuring device 109 for connecting the connector 107 to the antenna receiver 101. In addition, the configuration is complicated and the detection device becomes relatively large, and many parts must be processed and assembled without error, but there is a possibility that performance unevenness may occur due to the difference in processing dimensions and assembly conditions. It was.

In addition, in the case of Patent No. 893396, a dipole sensor is applied, and the antenna receivers 100a and 100b of the hemispherical shape face each other, and the antenna receivers 100a and 100b are connected to the ground line 104 and the signal line 102. The ground wire 104 is connected to the junction element 106 and the signal line 102 to the connector 14, and the metal vessel 17 is supported while supporting the junction element 106 and the connector 14. Consists of a flange 20 for sealing, the connector 14 is connected to the measuring device 16 through a coaxial cable 15, also a somewhat complicated configuration and a pair of hemispherical antenna receiver (100a) ( 100b) has the disadvantage of increasing the size of the detection device.

In addition, the registered detection devices have a disadvantage in that a separate handhole for installing a detection device in a metal container is installed, and a detection device must be installed using the handhole due to the increase in size. Due to its structural detection sensitivity, it provides a frequency characteristic of less than -10dB in the high frequency band of 1 ~ 1.5GHz, so it is difficult to detect the partial discharge generated over voltage, but it is difficult to estimate the kind and location of the defect. .

According to the present invention, in the partial discharge detection sensor and the detection device using the sensor of the gas insulated device, the configuration is simplified and reduced in size and light weight, so that the manufacturing of the detection sensor is not only easy, but also due to the miniaturization, It is possible to easily install in the inlet (insulation gasket) for insulated gas injection without the need to construct a separate hand sensor for the installation of a separate sensor, and also detect the partial discharge generated over voltage, but change the structure of the detection sensor. Through this, it has a frequency characteristic of -10dB or less in the 0.5 ~ 12GHz band and maintains excellent sensitivity of -30dB or less in the 0.5 ~ 1.5GHz band, thereby ensuring reliability and safety in the operation of power equipment.

In order to achieve the above object, the present invention has a circular patch symmetrically protruded around the cone of the conical patch and the conical patch, the annular patch is located at the edge, the conical patch and the circular patch and the annular patch has a dielectric constant of 2.2 It is a conical monopole sensor that is formed of phosphorus alloy material so that they can be integrally combined. Each patch is composed of an electrical conductor (PEC) to form a partial discharge detection sensor of a gas insulated device, and the detection sensor is made of metal. It is installed in a sealed form at the insulated gas inlet (insulated gasket) formed in the container, the connector is installed at the lower protrusion of the conical patch, and the detector is configured to be connected to the measuring device by coaxial cable. When discharge occurs, the partial sensor receives a partial discharge, and the received voltage is Sent to the measuring device via a cable, which will be detected.

According to the present invention, the partial discharge detection sensor and the detection device of the gas insulated device can be easily installed in a metal container by simplifying, miniaturizing, and reducing the detection sensor. Has a frequency characteristic of -10 dB or less and maintains excellent sensitivity of -30 dB or less in the 0.5 to 1.5 GHz band, which not only ensures safety and reliability in the operation of power equipment, but also provides excellent sensitivity of broadband. By detecting the use and partial discharge, it is possible to estimate the type and location of the defect and to perform stable maintenance of the gas insulated device.

1 is an illustration of a conventional detection device
2 is an illustration of a conventional detection device
3 is an illustration of a conventional detection device
4 is an illustration of a conventional detection device
5 is a perspective view of the detection sensor of the present invention
6 is a front configuration diagram of the detection sensor of the present invention
7 is a side configuration diagram of the detection sensor of the present invention
8 is a plan view of the detection sensor of the present invention
9 is a cross-sectional view of the detection sensor of the present invention
10 is a perspective view of a main part of the detection sensor of the present invention.
11 is an exemplary view of a detection device using the detection sensor of the present invention
12: Another embodiment of the present invention
13: Another embodiment of the present invention

Hereinafter, an embodiment of a partial discharge detection sensor and a detection device using the sensor of a gas insulated device to be provided in the present invention will be described in detail with reference to the accompanying drawings.

The partial discharge detection sensor 30 of the gas insulator is shown in detail in FIGS. 5 to 10, and the detection sensor 30 is a high sensitivity broadband conical motor pole sensor for partial discharge detection. In the operation of power equipment such as switchgear and transformer, safety and reliability improvement and wideband UHF built-in sensor are installed in gas insulated device to detect abnormality due to partial discharge during operation.

The detection sensor 30 includes a pair of circular patches 50 protruding symmetrically on both sides with respect to the lower end of the conical patch 40 and the conical patch 40, and the conical patch 40 and the circular patch 50. The annular patch 60 is located at the edge, and these are molded into an annular support 70 made of an alloy material having a dielectric constant of 2.2 so as to be integrally assembled. 41) is configured.

At this time, the conical patch 40, the circular patch 50 and the annular patch 60 is composed of an electrical conductor (PEC).

In the conical patch 40 is a bottom-shaped cone (cone) is cut in half and then the bottom surface is joined to each other, hemispherical shape toward the vertex 43 from the semi-circular protrusion 42 and the semi-circular protrusion 42 The inclined surface 44 of the.

Circular patch 50 is formed on both sides of the conical patch 40 is projected in a thin disk shape on both sides relative to the two vertices 43, the vertex 43 is located in the center of the circular patch 50, annular The patch 60 is comprised in ring shape.

In addition, the diameter (A) of the support 70 made of alloy material is 80 mm, the thickness (B) is 10 mm, the height (C) of the conical patch 40 protruding to the upper surface of the support 70 is 10 mm, the width ( D) is 30 mm, the diameter E of the circular patch 50 is 10 mm, the diameter F of the annular patch 60 is 37 mm, and the overall height G of the detection sensor 30 is 26 mm. It is preferable.

The size of each of the components presented above can be expanded at the same ratio, but in this case, the size of the detection sensor 30 is not preferable, and if the size is reduced to reduce the volume, the function of the detection sensor 30 is reduced. It is not desirable because it falls.

In addition, the specification of each component is a ratio of the function of the antenna for detecting the partial discharge, that is, the function of the detection sensor 30 to the optimal state, but each specification may be implemented in large or small within the range of 10%. .

In constructing the detection sensor 30 of the present invention, as shown in FIG. 12, the circular patch 50 may be arranged in all directions, and as shown in FIG. 13, a single circular patch 50 based on the conical patch 40 as shown in FIG. Can be used.

The partial discharge detection device 90 of the gas insulated device using the detection sensor 30 having the above-described configuration is configured as follows.

Since the detection sensor 30 to be provided in the present invention is compact, it can be installed and used in the insulated gas injection hole (insulated gasket portion) 85 formed in the metal container 83. There is no need to configure a separate handhole (not shown).

That is, as shown in FIG. 11, the protrusion 41 formed at the lower end of the conical patch 40 of the detection sensor 30 is positioned on the inner surface of the sealing plug 87 of the insulating gas injection port 83, which is essentially formed in the metal container 83. Then, the connector 80 is connected to the outside of the sealing plug 87, and the connector 80 is connected to the measuring device 82 through the coaxial cable 81, thereby completing the installation of the detection device 90.

In installing the detection sensor 30 of the present invention in the metal container 83, a separate hand hole (not shown) is formed on one side of the metal container 83 as in the prior art, and the detection sensor 30 in the flange of the hand hole. ) Can be configured to configure the detection device 90, the effect is the same.

Reference numeral 84 is a high voltage conductor, 86 is an insulating support.

The present invention configured as described above is different from the conventional method for detecting a partial discharge in the metal container 83 by installing the detection sensor 30 in the metal container 83 of the gas insulated device filled with insulating gas. There is no bar.

However, the detection sensor 30 to be provided in the present invention is a support made of an alloy material having a dielectric constant of 2.2 with a conical patch 40 consisting of an electrical conductor (PEC) and a circular patch 50 and a separate annular patch 60 at the edge. Located in the 70, in particular the conical patch 40 is projected from the support 70 while the inclined surface 44 is formed toward both vertices 43 relative to the semi-circular projection 42, the conical patch 40 Circular patch 50 is formed on both sides of the vertex 43 of the structure, and can effectively detect the partial discharge generated over voltage. In the 0.5 to 12 GHz band due to the resonance of the annular patch 60 formed at the edge- It has a frequency characteristic of less than 10dB, and has a sensitivity of -30dB or less in the 0.5-1.5GHz band which is a UHF band.

In particular, the detection sensor 30 of the present invention can be easily installed in the insulated gas injection port 85, which is essentially configured without having to configure a separate handhole for installing the detection sensor as it is miniaturized and lightweight.

That is, as shown in FIG. 11, the protrusion 41 at the bottom of the circular patch 40 constituting the detection sensor 30 is positioned on the inner surface of the sealing plug 87 of the insulating gas injection port 85, and then connected to the connector 80. The connector 80 is connected to the measuring device 82 through a coaxial cable 81.

Therefore, when a partial discharge occurs when a voltage abnormality occurs due to various factors in the metal container 83 constituting the insulating device, it can be effectively detected.

In particular, it has a frequency characteristic of -10 dB or less in the 0.5 to 12 GHz band, and a sensitivity of -30 dB or less in the 0.5 to 1.5 GHz band, which is a UHF band, so that even if a minute partial discharge occurs, it is immediately detected.

In a brief description of the detection method, when a partial discharge occurs in the metal container 83, a high frequency pulse current of several GHz is generated, and a current wave propagates in the metal container 83, and the electromagnetic wave is conical. Derived into the detection sensor 30 consisting of a patch 40 and a circular patch 50 and the annular patch 60 is applied to the outside through the connector 80, and then measuring device 82 through the coaxial cable 81 It is possible to detect the presence of abnormality by transmitting to.

The detection sensor 30 used in the present invention has a structure capable of detecting electromagnetic waves in a wide band range, and thus may cause a cause and a position of a voltage abnormality according to the type of electromagnetic waves and the sensitivity detected by each detection sensor.

(30)-Detection Sensor (40)-Conical Patch
(41)-protrusion (42)-semicircular protrusion
(43)-Vertex (44)-Slope
(50)-round patch (60)-annular patch
(70)-support (80)-connector
(81)-Coaxial Cable (82)-Measuring Device
(90)-detector

Claims (5)

In constructing a partial discharge detection sensor of a gas insulated device in which a high voltage conductor is supported by an insulating support in a metal container sealed with insulating gas, the inclined surface 44 connects the vertices 43 formed on both sides of the semi-circular protrusions 42. Conical patch 40, the circular patch 50 in the form of a disk at both vertices 43 of the conical patch 40, and the ring-shaped annular patch 60 at the edge of the circular patch 50, The conical patch 40 and the circular patch 50 and the annular patch 60 are molded into a support 70 so that they are assembled integrally, but the conical patch 40 protrudes above the support 70. Protruding portion 41 formed at the bottom of the conical patch 40 to protrude to the lower portion of the support 70, the support 70 is composed of an alloy material having a dielectric constant of 2.2, conical patch 40, circular patch 50 ) And annular patch 60 is characterized in that it is composed of an electrical conductor (PEC) It is part of the gas-insulated apparatus discharge detection sensor. 2. The height (C) of the conical patch (40) of claim 1, wherein the diameter (A) of the support (70) made of alloy material is 80 mm, the thickness (B) is 10 mm, and protrudes from the upper surface of the support (70). Is 10 mm, the diameter E of the circular patch 50 is 10 mm, and the total height G of the detection sensor 30 is 26 mm. The partial discharge detection sensor of a gas insulated device according to claim 1, wherein four circularly shaped circular patches (50) formed at the bottom of the conical patch (40) are configured to protrude at equal intervals. The sensor of claim 1, wherein the vertices (43) of the conical patch (40) are positioned at the center of the circular patch (50). In constructing a partial discharge detection device of a gas insulator in which a high voltage conductor is supported by an insulating support in a metal container sealed with an insulating gas, a semicircular protrusion 42 and a vertex 43 formed on both sides of the semicircular protrusion 42 are formed. Conical patch 40 connected to the inclined surface 44, the circular patch 50 in the form of a disk at both vertices 43 of the conical patch 40, and an annular annular patch 60 at the edge The conical patch 40 and the circular patch 50 and the annular patch 60 are molded into the support 70 so that they are integrally assembled, and the conical patch 40 protrudes upward from the support 70. In addition, the protrusion 41 formed at the bottom of the conical patch 40 to protrude to the lower portion of the support 70, the support 70 is composed of an alloy material having a dielectric constant of 2.2, the conical patch is made of an electrical conductor (PEC) Insulation sensor 30 is made of metal container 83 It is installed inside the sealing plug 87 of the injection hole 85, and then connected to the connector 80 from the outside of the sealing plug 87, the connector 80 and the measuring device 82 through the coaxial cable 81 Partial discharge detection device of a gas insulated device characterized in that it is connected.

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