KR20110126400A - Polymer housing having isulation diagnosis sensor on the inside - Google Patents

Abstract

PURPOSE: A polymer housing with an insulation diagnosis sensor is provided to efficiently sense a charge which is generated in a partial discharge using a partial discharge sensing part which is built in an insulation rod. CONSTITUTION: A vacuum interrupter(210) comprises a vacuum part(211), a fixed electrode(212), and a movable electrode(213). An upper fixing part(220) is made of a fiber glass reinforced plastic. An insulation rod(230) is placed between the movable electrode and a driving mechanism. A bottom fixing part(240) is placed in the outside of the insulation rod. A housing(250) insulates the vacuum interrupter with the outside.

Description

POLYMER HOUSING HAVING ISULATION DIAGNOSIS SENSOR ON THE INSIDE}

The present invention relates to a polymer housing built-in insulation diagnostic sensor, and more particularly, to a vacuum circuit breaker including a polymer housing provided inside the insulation diagnostic sensor.

Breaker is a device installed on the pole and used to change the opening and closing of the electric circuit.

Generally, the breaker is an inlet breaker using oil, a gas breaker using SF6 gas, an inert gas, an air breaker using air, a magnetic breaker using magnetism, and a vacuum using excellent dielectric strength of vacuum depending on the SOHO medium. Can be classified as a breaker.

Recently, the vacuum breaker which is the most used among medium voltage breakers has been commercialized in the 1960s by utilizing the advantage of high dielectric strength under vacuum of 3 ~ 10 Torr or less, and has made significant progress in high voltage, high current and miniaturization. have. A vacuum interrupter, which is a key component of a vacuum breaker, includes a movable electrode and a fixed electrode, each having a well-closed vacuum part and a contact contact with each other in the vacuum part to maintain a vacuum state.

In such a vacuum breaker, load switching and fault current blocking are performed in a vacuum state in the vacuum interrupter, but external insulation of the vacuum interrupter is performed in various media. Like a vacuum circuit breaker (VCB), the vacuum interrupter may be insulated in the air. Like an oil circuit breaker (OCB), the vacuum interrupter may be covered with oil to insulate and insulate the SF6 gas like a high pressure switch. Insulation can also be achieved. However, this insulation method has several problems.

VBC and air insulation are not used where high brain shock voltages are required because of the low dielectric strength of the air. In addition, the use of oil insulation such as OCB has rarely been used recently because of the risk of oil explosion. Finally, the use of SF6 gas, such as a high-pressure switch, can be used where a high brain shock voltage is required, and there is no explosion risk, but environmental regulations are increasingly used.

Due to this tendency, a solid insulation method using epoxy has recently been used.

However, the solid insulation method using epoxy has excellent insulation performance and mechanical properties, but it is difficult to remove the housing of the epoxy material in case of failure. Therefore, there is a problem in that it is not possible to reuse an internal material such as a vacuum interrupter or a cost is consumed to remove the housing, resulting in economical cost burden.

In addition, when an insulation abnormality occurs due to the incorporation of a metal foreign matter inside the device or a defect in the insulation, the breaker causes a high frequency partial discharging (DP) at the abnormal site and mechanical degradation and finally breaks down the insulation. Becomes Therefore, for normal operation of the breaker, it is important to detect the partial discharge and prevent the accident in advance. However, at the time of production and shipment at the factory, insulation test is performed to check the insulation status, but after the shipment is installed on the distribution line, the direct insulation status cannot be confirmed.

Accordingly, an object of the present invention is to provide a vacuum circuit breaker capable of always diagnosing partial discharge after installing a circuit breaker in a distribution line.

In addition, an object of the present invention is to provide a vacuum circuit breaker capable of easily recycling the components located inside the housing by easily removing only the housing, when the partial discharge is detected to replace the insulation device included in the vacuum circuit breaker. .

It is also an object of the present invention to prevent damage to the vacuum interrupter and the insulating rod in the process of forming the housing.

In addition, an object of the present invention is to facilitate the molding process of the housing by easily securing a space for the insulating rod to move in the process of forming the housing.

Other objects of the present invention will be readily understood through the following description of the embodiments.

According to an aspect of the present invention to achieve the object as described above is provided with a vacuum circuit breaker.

According to a preferred embodiment of the present invention, in the vacuum circuit breaker for performing the opening and closing of the load and the blocking of the fault current by using the driving force generated in the driving mechanism (mechanism) provided in the drive device, the inside is maintained in a vacuum state A vacuum interrupter including a fixed electrode on one side and a movable electrode on the other side, and performing electrical connection and blocking between the fixed electrode and the movable electrode by moving the movable electrode therein; An insulating rod disposed between the movable electrode and the driving mechanism and installed to transfer the driving force generated by the driving mechanism to the movable electrode; And a partial discharge detection unit embedded in the insulating rod, the partial discharge detection unit detecting a charge generated during partial discharge in the vacuum breaker.

Here, the insulating rod fixing portion to be detachably fixed to the drive mechanism, formed of a conductive material; And a conductive line embedded in the insulating rod and electrically connecting the partial discharge detection unit and the insulating rod fixing unit.

The conductive wire may be installed to be exposed to the outside of the insulating rod when the insulating rod fixing part is dismantled from the driving mechanism.

The partial discharge detection unit may include a capacitor, and the capacitor may charge electric charges generated during partial discharge and discharge the charged electric charges through the conductive wires.

The vacuum interrupter may be insulated from the outside, and may further include a housing formed of a silicon material.

In addition, the housing may be provided with a housing fixing portion for coupling with the drive device on the side facing the drive device.

In addition, it may further include an upper fixing part which is manufactured as a separate part and positioned between the side of the vacuum interrupter and the housing and formed of an insulator having better mechanical properties than silicon.

The upper fixing part may have a hollow shape at both sides thereof, and an inner surface of the upper fixing part may be formed in the same shape as the outer surface of the vacuum interrupter, and the vacuum interrupter may be fixed to the upper fixing part by a force fitting method. Can be.

In addition, both sides of the hollow is manufactured as a separate part, the inner side of the outer side of the insulating rod to form a space for the movement of the insulating rod, the lower fixing portion formed of an insulating material having better mechanical properties than silicon It may further include.

As described above, according to the vacuum circuit breaker according to the present invention, the charge generated during the partial discharge can be easily detected through the partial discharge detection unit built in the insulating rod. Therefore, there is an advantage that the insulating property of the insulating device can be always diagnosed even after the installation of the insulating device by measuring the amount of charge generated during partial discharge.

In addition, according to the vacuum circuit breaker according to the present invention, the housing can be easily removed by forming the housing from silicon. Therefore, there is an advantage that can be reused of the vacuum interrupter, which is located inside the housing.

In addition, according to the vacuum circuit breaker according to the present invention, through the upper fixing portion and the lower fixing portion, the mechanical properties of the housing formed of silicon can be compensated for, and the space in which the insulating rod can be moved in the process of forming the housing is easily provided. There is an advantage that can be secured.

In addition, according to the vacuum breaker according to the present invention, through the upper fixing portion and the lower fixing portion, there is an advantage that the operation of removing the housing can be easier in the case of failure of the housing.

In addition, according to the present invention, due to the mechanical properties of the upper fixing portion and the lower fixing portion, there is an advantage that can prevent damage to the vacuum interrupter, insulating rod, etc. in the process of manufacturing the insulating device.

1 is a view showing the structure of a vacuum circuit breaker from the front to explain the structure of the vacuum circuit breaker according to an embodiment of the present invention.
Figure 2 is a view showing the structure of a vacuum circuit breaker in the side to explain the structure of the vacuum circuit breaker according to an embodiment of the present invention.
3 is a diagram illustrating an insulation device provided in the vacuum circuit breaker of FIG. 2.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Like reference numerals are used for like elements in describing each drawing. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may exist in between. Should be.

On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention.

Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art.

Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, a vacuum circuit breaker according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 is a view showing the structure of a vacuum circuit breaker from the front to explain the structure of the vacuum circuit breaker according to an embodiment of the present invention. Figure 2 is a view showing the structure of a vacuum circuit breaker in the side to explain the structure of the vacuum circuit breaker according to an embodiment of the present invention. 3 is a diagram illustrating an insulation device provided in the vacuum circuit breaker of FIG. 2.

In describing the drawings, in order to make the present invention more clear, the description of components other than the main part of the present invention will be omitted or simplified.

1 to 3, the vacuum circuit breaker 1 according to an exemplary embodiment of the present invention may include a driving device 100 and an insulating device 200. By the driving mechanism 110 provided in the driving device 100, the opening and closing of a load and blocking of a fault current may be performed in the insulating device 200. When an abnormal current is detected, the driving device 100 may drive the driving mechanism 110 to block opening and closing of a load and blocking of a fault current in the insulation device 200.

The insulation device 200 may include a vacuum interrupter 210, an upper fixing part 220, an insulating rod 230, a lower fixing part 240, and a housing 250.

The vacuum interrupter 210 may include a vacuum unit 211, a fixed electrode 212, and a movable electrode 213.

The vacuum unit 211 may be maintained in a vacuum state, a fixed electrode 212 may be positioned at an upper portion thereof, and a movable electrode 213 may be positioned at a lower portion thereof. The upper conductor 260 may be electrically connected to one side of the fixed electrode 212, and the lower conductor 270 may be electrically connected to one side of the movable electrode 213. Distribution lines (not shown) may be connected to the upper conductor 260 and the lower conductor 270. In addition, an insulation rod 230 may be installed at one side of the movable electrode 213 to transmit the driving force generated by the driving mechanism 110. The insulating rod 230 may be connected to the movable electrode 213 to move the movable electrode 213 up and down. The vacuum interrupter 210 having the structure as described above may perform opening and closing of a load and blocking of a fault current by vertical movement of the movable electrode 213 in the vacuum unit 211. Since the matters related to the specific operation of the vacuum interrupter 210 are well known, detailed description thereof will be omitted.

The upper fixing part 220 may be manufactured as a separate component to surround the side of the vacuum interrupter 210. The upper fixing part 220 may be formed of an insulator made of a material having better mechanical properties, for example, mechanical strength, than the housing 250. Preferably, the upper fixing part 220 may be formed of, for example, glass fiber reinforced plastic (FRP) having better mechanical properties than silicon. As will be described later, the housing 250 may be formed of a silicon material. Therefore, the upper fixing part 220 may complement the mechanical characteristics of the housing 250 made of silicon. In detail, the housing 250 made of silicon may not be firmly fixed to the vacuum interrupter 210 due to the lack of mechanical strength. Therefore, the upper fixing part 220 of a material having better mechanical properties than silicon may allow the vacuum interrupter 210 to be easily fixed inside the housing 250.

In general, the vacuum portion 211 of the vacuum interrupter 210 is manufactured in a cylindrical shape. Therefore, the inner side of the upper fixing portion 220 is made of a cylindrical shape having the same radius as the radius of the outer surface of the vacuum portion 211, the vacuum portion 211 is fixed to the upper fixing portion 220 by the interference fit method The vacuum interrupter 210 may be easily fixed inside the housing 240.

In general, the vacuum unit 211 is formed of ceramic, and the vacuum unit 211 may be damaged during the operation of removing the housing 250. In this case, the present invention may include the upper fixing part 220 outside the vacuum part 211, thereby preventing the vacuum part 211 from being damaged during the operation of removing the housing 250. In addition, when cooling in the process of forming the housing 250, it is possible to prevent the pressure applied to the vacuum unit 211 due to the difference in thermal expansion coefficient between the housing 250 of the silicon material and the vacuum unit 211 of the ceramic material. Can be. Here, the upper fixing part 220 may be manufactured as a separate component, and may be installed to surround the outside of the vacuum part 210 when the insulating device 200 is manufactured.

The insulating rod 230 may be positioned between the movable electrode 213 and the driving mechanism 110 to transfer the driving force generated by the driving mechanism 110 to the movable electrode 213. That is, the movable electrode 213 receives the driving force generated by the driving mechanism 110 through the insulating rod 230 and moves up and down, thereby opening and closing the load and blocking the fault current.

The insulating rod 230 according to the present invention may include a partial discharge detector 231, a conductive wire 232, and an insulating rod fixing part 233.

The partial discharge detector 231 may be built in the insulating rod 230. The partial discharge detector 231 has a structure capable of accumulating electric charges generated during partial discharge, and may include a capacitor. Here, the first pole of the condenser may be electrically connected to the movable electrode 213, and the second pole may be electrically connected to the conductive wire 232. The capacitor may be a ceramic condenser, but the present invention does not limit the type of capacitor. The capacitor can easily detect the electric charge generated at the partial discharge due to the low impedance at the ultra-high frequency generated during the partial discharge due to the characteristics of the device. The operator of the vacuum circuit breaker 1 can determine the degree of deterioration of the housing due to the partial discharge by analyzing the amount of charge accumulated in the capacitor. The partial discharge detector 231 may be electrically connected to the outside of the housing 250 through the conductive line 232. Therefore, when testing the degree of deterioration of the housing 250 due to the partial discharge, the partial discharge detector 231 may be connected to the input terminal of the test equipment (not shown) through the conductive line 232. The amount of charge discharged from the partial discharge detector 231 through the test equipment may be used to determine an insulation characteristic or a degree of deterioration of the housing 250.

The insulating rod fixing part 233 may function to fix the insulating rod 230 to the driving mechanism 110. In addition, the insulation device 200 may be easily separated from the driving device 100 when the degree of degradation of the insulation device 200 is measured. Degradation of the insulation device 200 by separating the insulation rod fixing part 233 from the driving mechanism 110 and connecting the conductor 232 with the input terminal of the test equipment when measuring the degree of degradation of the insulation device 200. Degree of measurement work can be easily performed. To this end, the conductive wire 232 is embedded in the insulating rod 230 and electrically connected to the partial discharge detector 231, and the insulating rod 230 when the insulating rod fixing part 233 is removed from the driving mechanism 110. It is preferable to be installed so as to be exposed to the outside of the. Alternatively, deterioration may be diagnosed by connecting the input terminal of the test equipment to the insulating rod fixing part 233. For this purpose, the insulating rod fixing part 233 is formed of a conductive material, and the conductive wire 232 is partially discharged. The detector 231 and the insulating rod fixing part 233 may be electrically connected to each other.

The lower fixing part 240 is a hollow type in which both sides are open, and may be located outside the insulating rod 230. The lower fixing part 240 may be formed in a cylindrical shape. The lower fixing part 240 may be formed of an insulator made of a material having better mechanical properties than silicon, for example, having high mechanical strength. Preferably, the lower fixing part 240 may be formed of glass fiber reinforced plastic (FRP) having better mechanical properties than silicon. The lower fixing part 240 is made of a separate component and is located outside the insulating rod 230 to facilitate the space A for the insulating rod 230 to move up and down in the process of forming the housing 250. It can be secured and can supplement the mechanical properties of the housing 250 formed of silicon. When replacing the housing due to a failure of the housing 250 including deterioration, the lower fixing part 240 may facilitate the removal operation of the housing 250. Therefore, the housing 250 may be removed to reduce the time and cost required for recycling the insulating rod 230.

The housing 250 may be formed in a structure for insulating the vacuum interrupter 210 from the outside. One side may expose one side of the upper conductor 260 and one side of the lower conductor 270. The housing 250 connects the upper conductor 260 to the fixed electrode 212, connects the lower electrode 270 and the insulating rod 230 to the lower conductor 213, and connects the upper fixing part 220 to the vacuum part 211. ), After assembly, and placing the insulating rod 230 inside the lower fixing part 240, may be molded after being inserted into a mold having a cavity having the same shape as the housing 250. Here, the housing 250 may be formed of silicon. By forming the housing 250 with a silicon material, the housing 250 may be easily manufactured, and when the housing 250 is defective, the housing 250 may be easily dismantled.

The housing fixing part 251 may be formed below the housing 250. The housing fixing part 251 may serve to more firmly fix the insulating device 200 to the driving device 100. The fixing part 251 may be manufactured in the form of a screw groove, and may be connected to the driving device 100 through a thread, and the present invention may be applied to the driving device 100 of the insulating device 200 through the housing fixing part 251. It does not limit the fixing method.

As described above, according to the vacuum circuit breaker 1 according to the present invention, the charge generated during the partial discharge may be easily detected through the partial discharge detection unit 231 located inside the insulating rod 230. Therefore, by measuring the amount of charge generated during partial discharge, the insulating property of the insulating device 200 can be always diagnosed even after the installation of the insulating device 200.

In addition, according to the vacuum circuit breaker 1 according to the present invention, the housing 250 may be easily removed by forming the housing 250 from silicon. Accordingly, reuse of the vacuum interrupter 210 located inside the housing 250 may be facilitated.

In addition, through the upper fixing portion 220 and the lower fixing portion 240, it is possible to supplement the mechanical properties of the housing 250 formed of silicon, the insulating rod 230 is moved in the process of forming the housing 250 The space A can be easily secured.

In addition, through the upper fixing part 220 and the lower fixing part 240, it may be easier to remove the housing during the failure (250) of the housing.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

100: drive device 110: drive mechanism
200: insulation device 210: vacuum interrupter
211: vacuum portion 212: fixed electrode
213: movable electrode 220: upper fixing portion
230: insulated rod 231: partial discharge detection unit
232: wire 233: insulated rod fixing
240: lower fixing part 250: housing
260: upper conductor 270: lower conductor

Claims (9)

In the vacuum circuit breaker for performing the opening and closing of the load and the interruption of the fault current by using the driving force generated in the drive mechanism (mechanism) provided in the drive device,
The inside has a vacuum interrupter and includes a fixed electrode on one side and a movable electrode on the other side, a vacuum interrupter (vaccum interruptor) to perform the electrical connection and blocking between the fixed electrode and the movable electrode by the movement of the movable electrode therein ;
An insulating rod disposed between the movable electrode and the driving mechanism and installed to transfer the driving force generated by the driving mechanism to the movable electrode; And
And a partial discharge detector built in the insulating rod and detecting a charge generated during partial discharge in the vacuum breaker.
The method of claim 1,
An insulating rod fixing part securely fixing the insulating rod to the driving mechanism and formed of a conductive material; And
And a conductive line embedded in the insulating rod and electrically connecting the partial discharge detection unit and the insulating rod fixing unit.
The method of claim 2,
And wherein the conductive wire is installed to be exposed to the outside of the insulating rod when the insulating rod fixing part is disassembled from the driving mechanism.
The method of claim 2,
The partial discharge detector includes a capacitor, wherein the capacitor charges a charge generated during the partial discharge, and discharges the charged charge through the conductive wire.
The method of claim 1,
And a housing formed of a silicon material to insulate the vacuum interrupter from the outside.
The method of claim 5, wherein
The housing is a vacuum circuit breaker, characterized in that the housing fixing portion for coupling with the drive device on the side facing the drive device.
The method of claim 5, wherein
The vacuum circuit breaker further comprises an upper fixing part which is manufactured as a separate component and is positioned between the side of the vacuum interrupter and the housing and is formed of an insulator having better mechanical properties than silicon.
The method of claim 7, wherein
The upper fixing portion is hollow with both sides open,
The inner surface of the upper fixing portion is formed in the same shape as the outer surface of the vacuum interrupter,
The vacuum interrupter is a vacuum circuit breaker, characterized in that fixed to the upper fixing portion by the interference fit method.
The method of claim 5, wherein
It is manufactured as a separate part in a hollow type with both sides open, the inner side of the outer side of the insulating rod to form a space for the movement of the insulating rod, and further comprises a lower fixing portion formed of an insulating material having better mechanical properties than silicon Vacuum breaker, characterized in that.

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