KR100838984B1 - Potential transformer of electronic type - Google Patents

Potential transformer of electronic type Download PDF

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Publication number
KR100838984B1
KR100838984B1 KR1020070023531A KR20070023531A KR100838984B1 KR 100838984 B1 KR100838984 B1 KR 100838984B1 KR 1020070023531 A KR1020070023531 A KR 1020070023531A KR 20070023531 A KR20070023531 A KR 20070023531A KR 100838984 B1 KR100838984 B1 KR 100838984B1
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South Korea
Prior art keywords
resistance
resistor
voltage
shielding layer
high voltage
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KR1020070023531A
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Korean (ko)
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박정남
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엘에스산전 주식회사
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H01F27/422—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers
    • H01F27/425—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers for voltage transformers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

An electronic type voltage transformer is provided to shield an external electric field by spraying a metal on an outer surface of the electronic type voltage transformer and forming a shielding layer. An electronic type voltage transformer includes a supporting bracket(11), a high voltage resistor(21), a low voltage resistor(22), an insulation material(31), and a shielding layer(32). The high voltage resistor and the low voltage resistor have a different resistance value, and are coupled in series. The high voltage and the low voltage resistor are insulated on the supporting bracket. The insulation material covers the supporting bracket, the high voltage resistor, and the low voltage resistor, and is formed to expose a side plane of the supporting bracket to the outside. The shielding layer is formed to cover an outer surface of the insulation material.

Description

전자식 전압 변성기 { Potential transformer of electronic type }Potential transformer of electronic type

도 1은 종래 기술에 따른 전자식 전압 변성기의 단면도.1 is a cross-sectional view of an electronic voltage transformer according to the prior art.

도 2는 종래 기술에 따른 다른 예에 따른 전자식 전압 변성기의 단면도.2 is a cross-sectional view of an electronic voltage transformer according to another example according to the prior art.

도 3은 본 발명의 일 실시예에 따른 전자식 전압 변성기의 사시도.3 is a perspective view of an electronic voltage transformer according to an embodiment of the present invention.

도 4는 도 3의 전자식 전압 변성기의 단면도.4 is a cross-sectional view of the electronic voltage transformer of FIG. 3.

* 도면의 주요 부호에 대한 설명 *Description of the main symbols in the drawings

1 : 전자식 전압 변성기 11 : 지지 브래킷1: electronic voltage transformer 11: support bracket

12 : 절연부재 13 : 단자대12: insulation member 13: terminal block

21 : 고압저항 22 : 저압저항21: high voltage resistance 22: low voltage resistance

31 : 절연재 32 : 차폐층31: insulation material 32: shielding layer

100 : 전자식 전압 변성기 121 : 고압저항100: electronic voltage transformer 121: high voltage resistance

122 : 저압저항 131 : 절연재122: low voltage resistance 131: insulating material

132 : 차폐망 200 : 전자식 전압 변성기132: shielding network 200: electronic voltage transformer

221 : 고압저항 222 : 저압저항221: high voltage resistance 222: low voltage resistance

231 : 절연재 232 : 차폐막231: insulating material 232: shielding film

233 : 절연가스233: insulation gas

본 발명은 전자식 전압 변성기에 관한 것으로서, 더욱 상세하게는 측정시 외부의 전계에 대하여 영향을 받지 않는 전자식 전압 변성기에 관한 것이다.The present invention relates to an electronic voltage transformer, and more particularly, to an electronic voltage transformer that is not affected by an external electric field during measurement.

일반적으로 전력계통에서 송전, 배전되는 전압이 상승되고, 이로 인하여 측정에 대한 정밀도도 높아져야 되므로, 고전압, 대전류 측정기기에 대한 성능에 대한 요구가 증가하고 있다.In general, since the voltage to be transmitted and distributed in the power system is increased, and thus the accuracy of the measurement must be increased, the demand for the performance of high voltage, high current measurement equipment is increasing.

통상적으로, 전력기기에 있어서, 고전압, 대전류는 이를 직접 측정할 수 없기 때문에, 상기 고전압, 대전류에 비례하는 측정용 전압, 전류를 출력하여 송전, 배전 선로의 전압, 전류를 측정한다. 이를 위하여, 종래에는 철심과 권선으로 구성되는 계기용 변압기(Pitential Transformer : PT)와 변류기(Current Transformer : CT)에 의해 측정되어 왔는데, 그 크기가 대형이고, 노이즈 등에 의한 간섭에 취약한 문제점이 있다.In general, in a power device, since a high voltage and a high current cannot be measured directly, a high voltage and a current for measurement proportional to the high voltage and a high current are output to measure the voltage and current of a power transmission and distribution line. To this end, in the prior art has been measured by the instrument transformer (Pitential Transformer: PT) and the current transformer (Current Transformer: CT) consisting of an iron core and winding, the size is large, there is a problem that is vulnerable to interference by noise and the like.

이를 개선하여 최근에는 전자식 변성기를 이용한 송전, 배전 선로의 고전압, 대전류를 측정하는 방식이 사용된다. 이러한 전자식 변성기는 크기가 소형이어서 설치가 간단하고, 2차 출력신호가 저전압 신호로써 마이크로 프로세서가 적용된 기기에 적압하다. 또한, 2차측으로 1차측 고전위가 출력되지 않아서, 기기의 신뢰성의 향상이 가능하고, 직류에서부터 수 GHz에 이르는 고주파에 이르는 광범위한 주파수 영역에서도 측정이 가능하다는 장점이 있다.In recent years, a method of measuring high voltage and large current of transmission and distribution lines using electronic transformers has been used. The electronic transformer is small in size and simple to install, and the secondary output signal is a low voltage signal, which is applied to a microprocessor-equipped device. In addition, since the primary side high potential is not output to the secondary side, the reliability of the device can be improved, and the measurement can be performed in a wide frequency range ranging from a direct current to a high frequency ranging from several GHz.

상기, 전자식 전압 변성기는 주로 저항을 이용하는 R분압방식과 캐페시터를 이용한 C분압방식을 이용하여, 송전, 배전 선로의 전압을 측정한다. 여기서, 저항을 이용하는 R분압방식은 커패시터를 이용하는 C분압방식보다 측정되는 값이 안정적이므로 많이 사용되고 있으나, 외부 전계에 영향을 많이 받는 단점이 있다. 즉, 서로 다른 저항값을 갖는 고압저항과 저항저항 사이에 전압 분압효과를 이용하여 송전, 배전 선로의 전압을 감지하게 되는데, 외부 전계에 의해서 출력되는 값이 변동되어 정확한 측정이 어려운 문제가 존재한다. 상기의 고압저항과 저압저항은 세라믹 위에 필름막으로 형성되는 관계로, 외부에서 고전계가 발생하면, 고압저항과 저압저항 주위의 기존 전계와 섞여 다른 형태의 전계가 발생하고, 외부의 전계와 저항에서 발생하는 전계가 합성되므로, 정확한 측정값을 얻을 수 없다.The electronic voltage transformer mainly measures the voltage of a power transmission and distribution line by using an R divided method using a resistor and a C divided method using a capacitor. Here, the R voltage dividing method using a resistor is more widely used than the C voltage dividing method using a capacitor because it is more stable, but has a disadvantage of being affected by an external electric field. That is, the voltage of the power transmission and distribution lines is sensed by using the voltage dividing effect between the high voltage resistance and the resistance resistance having different resistance values, but there is a problem that accurate measurement is difficult because the value output by the external electric field is changed. . Since the high voltage resistance and the low voltage resistance are formed as a film film on the ceramic, when a high electric field is generated from the outside, a different type of electric field is generated by mixing with the existing electric field around the high voltage resistance and the low pressure resistance, and generated from the external electric field and the resistance. Since the electric field is synthesized, accurate measurement values cannot be obtained.

한편, 상기와 같은 외부 전계에 의한 영향을 줄이기 위해서, 저항을 이용하여 R분압방식 이용하여 전압을 측정하는 전자식 전압 변성기는 내부에 차폐막을 형성하여, 외부 전계에 의한 영향을 줄여서 사용한다.On the other hand, in order to reduce the influence of the external electric field as described above, the electronic voltage transformer for measuring the voltage using the R voltage dividing method using a resistance to form a shielding film inside, to reduce the influence of the external electric field.

종래기술에 따른 전자식 전압 변성기를 도 1과 도 2를 통해서 살펴보면, 고압저항과 저압저항의 외측에 차폐망 또는 차폐막을 구비하는 형태이다.Looking at the electronic voltage transformer according to the prior art through FIGS. 1 and 2, the shielding net or the shielding film is provided on the outer side of the high voltage resistance and the low voltage resistance.

도 1에 도시된 바와 같은 종래 기술에 따른 전자식 전압 변성기(100)는 정해진 비율의 저항값을 갖는 고압저항(121)과 저압저항(122)을 전기적으로 연결하고, 상기 고압저항(121)과 저압저항(122)의 외측에 외부 전계 차폐를 위한 그물형태를 갖는 차폐망(132)을 구비하고, 상기 고압저항(121)과 저압저항(122) 및 차폐망(132)을 에폭시와 같은 절연재(131)로 성형하여 전자식 전압 변성기(100)를 제작하였다. 즉, 외부 전계를 차폐할 수 있는 망형태의 차폐망(132)을 상기 고압저 항(121)과 저압저항(122)의 외측을 둘러싸는 형태로 구비하고, 상기 고압저항(121), 저압저항(122) 및 차폐망(132)을 둘러싸도록 에폭시와 같은 절연재(131)로 성형하게 되는데, 상기 차폐망(132)을 통하여 용융된 절연재(131)가 쉽게 통과하면서 전자식 전압 변성기(100)가 된다.The electronic voltage transformer 100 according to the related art as shown in FIG. 1 electrically connects the high voltage resistor 121 and the low voltage resistor 122 having a predetermined ratio of resistance values, and the high voltage resistor 121 and the low voltage. A shielding net 132 having a net shape for shielding an external electric field is provided outside the resistor 122, and the high voltage resistor 121, the low voltage resistor 122, and the shielding net 132 are insulated such as epoxy. ) To form an electronic voltage transformer (100). That is, the network-type shielding network 132 capable of shielding an external electric field is provided in the form of surrounding the outside of the high voltage resistance 121 and the low voltage resistance 122, the high voltage resistance 121, low voltage resistance The insulating material 131 such as epoxy is formed to surround the 122 and the shielding net 132, and the molten insulating material 131 passes easily through the shielding net 132 to become the electronic voltage transformer 100. .

하지만, 망형태의 차폐망(132)을 이용하는 종래기술의 전자식 전압 변성기는 상기 차폐망(132)의 단부에서 부분 방전이 발생하여 측정값에 오차가 발생하는 문제가 존재하고, 상기 차폐망(132) 자체를 성형하기 어려운 문제점이 있다.However, the conventional electronic voltage transformer using the mesh type shielding network 132 has a problem in that a partial discharge occurs at an end of the shielding network 132 and an error occurs in the measured value, and the shielding network 132 ) Is difficult to mold itself.

도 2에 도시된 바와 같은 종래 기술에 따른 전자식 전압 변성기(200)는 서로 정해진 비율의 저항값을 갖는 고압저항(221)과 저압저항(222)을 판재로 이루어지는 차폐막(232)으로 둘러싸고, 상기 고압저항(221), 저압저항(222) 및 차폐막(232)을 둘러싸도록 절연재(231)로 성형하여 전자식 전압 변성기(200)를 제작하였다. 이 경우, 중심은 SF6가스와 같은 절연가스(233)로 절연하여 이중으로 절연하기도 한다.The electronic voltage transformer 200 according to the related art as shown in FIG. 2 surrounds a high voltage resistor 221 and a low voltage resistor 222 having a resistance value of a predetermined ratio with a shielding film 232 made of a plate, and the high voltage. The electronic voltage transformer 200 was manufactured by molding the insulating material 231 to surround the resistance 221, the low voltage resistance 222, and the shielding film 232. In this case, the center may be insulated with an insulating gas 233, such as SF6 gas, and double insulated.

하지만, 고압저항(221)과 저압저항(222)을 금속판형태로 이루어지는 차폐막(232)으로 둘러싸는 경우에는 상기, 차폐막(232)에 의해서 용융된 절연재(231)가 고르게 침투하지 못하여 성형성이 저하되고 성형이 완료된 이후에는 크랙이 발생는 문제점이 있다. 또한, 내부에 SF6가스와 같은 절연가스(233)를 충진하여야 하므로 제조과정이 복잡한 문제가 있다.However, when the high pressure resistance 221 and the low pressure resistance 222 are surrounded by the shielding film 232 formed in the form of a metal plate, the insulating material 231 melted by the shielding film 232 does not evenly penetrate, and thus the moldability is deteriorated. After the molding is completed, there is a problem that the crack occurs. In addition, since the insulating gas 233, such as SF6 gas to be filled inside, there is a complicated manufacturing process.

본 발명은 상기와 같은 문제점을 해결하기 위해 발명된 것으로서, 전자식 전압 변성기에서 고압저항과 저압저항에 작용하는 외부전계를 간단하게 차폐할 수 있 는 전자식 전압 변성기를 제공하는 것을 목적으로 한다.The present invention has been made to solve the above problems, an object of the present invention is to provide an electronic voltage transformer that can easily shield the external electric field acting on the high voltage resistance and low voltage resistance in the electronic voltage transformer.

상기와 같은 목적을 달성하기 위해 본 발명의 전자식 전압 변성기는, 지지브래킷; 서로 다른 저항값을 갖고, 서로 직렬 연결되며, 상기 지지브래킷에 절연되도록 한 쌍으로 구비되는 고압저항과 저압저항; 상기 지지브래킷, 고압저항 및 저압저항을 둘러싸되, 상기 지지브래킷의 일측면은 노출되도록 성형되는 절연재; 및 상기 절연재의 외표면을 둘러싸도록 형성되는 차폐층을 포함한다.In order to achieve the above object, the electronic voltage transformer of the present invention comprises: a support bracket; A high voltage resistance and a low voltage resistance having a different resistance value and connected in series to each other and provided in a pair to insulate the support bracket; An insulating material surrounding the support bracket, a high pressure resistance, and a low pressure resistance, wherein one side of the support bracket is formed to be exposed; And a shielding layer formed to surround the outer surface of the insulating material.

상기 차폐층은 메탈라이징을 하거나, 금속재 도료를 도포하거나, 금속박판을 부착하여 형성될 수 있다.The shielding layer may be formed by metallizing, applying a metal paint, or attaching a metal thin plate.

이하, 첨부된 도면을 참조하여 본 발명의 전자식 전압 변성기의 바람직한 실시예를 설명한다.Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the electronic voltage transformer of the present invention.

도 3은 본 발명에 따른 전자식 전압 변성기의 외형을 도시한 사시도이고, 도 4는 도 3의 전자식 전압 변성기의 단면도이다.3 is a perspective view illustrating an external shape of the electronic voltage transformer according to the present invention, and FIG. 4 is a cross-sectional view of the electronic voltage transformer of FIG. 3.

본 발명에 따른 전자식 전압 변성기(1)는 지지브래킷(11)과, 상기 지지브래킷(11)에 절연되도록 한 쌍으로 구비되는 고압저항(21)과 저압저항(22)과, 상기 지지브래킷(11), 고압저항(21), 저압저항(22)을 둘러싸도록 성형되는 절연재(31) 및 상기 절연재(31)의 외표면에 형성되는 차폐층(32)을 포함한다.The electronic voltage transformer 1 according to the present invention includes a support bracket 11, a high voltage resistor 21 and a low voltage resistor 22, which are provided in a pair so as to be insulated from the support bracket 11, and the support bracket 11. ), An insulating material 31 formed to surround the high voltage resistance 21, the low voltage resistance 22, and a shielding layer 32 formed on an outer surface of the insulating material 31.

지지브래킷(11)은 후술되는 고압저항(21)과 저압저항(22)이 고정되어 서로 상대적인 위치를 위치할 수 있고, 전자식 전압 변성기(1)를 여타 전력기기에 장착될 수 있도록 한다.The support bracket 11 is fixed to the high-voltage resistor 21 and the low-voltage resistor 22 to be described later can be positioned relative to each other, and the electronic voltage transformer 1 can be mounted to other power equipment.

고압저항(21)과 저압저항(22)은 서로 다른 저항값을 갖고 한 쌍으로 마련되어 직렬연결되며, 상기 지지브래킷(11)에 구비된다.The high voltage resistor 21 and the low voltage resistor 22 have different resistance values and are provided in pairs and connected in series, and are provided in the support bracket 11.

고압저항(21)은 상기 지지브래킷(11)에 절연된 상태로 고정된다. 고압저항(21)의 단부에 절연부재(12)를 개재하여 상기 지지브래킷(11)에 고정시킨다. The high voltage resistor 21 is fixed in an insulated state to the support bracket 11. The insulating member 12 is fixed to the support bracket 11 through the insulating member 12 at the end of the high voltage resistor 21.

한편, 상기 고압저항(21)의 양단에는 단자를 연결하기 위한 단자대(13)가 마련되어, 상기 고압저항(21)을 회로에 연결되도록 한다.Meanwhile, terminal blocks 13 for connecting terminals are provided at both ends of the high voltage resistor 21 to connect the high voltage resistor 21 to a circuit.

저압저항(22)도 고압저항(21)과 마찬가지로 상기 지지브래킷(11)에 절연된 상태로 고정되고, 상기 고압저항(21)과 전기적으로 연결된다.Like the high pressure resistor 21, the low pressure resistor 22 is also fixed in an insulated state to the support bracket 11 and electrically connected to the high pressure resistor 21.

이때, 상기 고압저항(21)과 저압저항(22)은 서로 정해진 비율을 갖도록 각각 서로 다른 저항값을 갖고, 직렬연결되어 상기 고압저항(21)의 입력측, 고압저항(21)과 저압저항(22)의 사이, 저압저항(22)의 출력측의 3개 지점의 전압을 측정하여, 송전, 배전 선로의 전압을 측정한다.At this time, the high voltage resistor 21 and the low voltage resistor 22 have different resistance values so as to have a predetermined ratio, and are connected in series so that the input side of the high voltage resistor 21, the high voltage resistor 21 and the low voltage resistor 22 are connected in series. ), The voltage at three points on the output side of the low voltage resistance 22 is measured, and the voltages of the power transmission and distribution lines are measured.

상기와 같이, 지지브래킷(11)에 고압저항(21)과 저압저항(22)이 직렬 연결된 상태에서, 지지브래킷(11), 고압저항(21) 및 저압저항(22)이 외부로 노출되지 않도록 절연재(31)로 성형한다.As described above, in a state in which the high pressure resistor 21 and the low pressure resistor 22 are connected to the support bracket 11 in series, the support bracket 11, the high pressure resistor 21, and the low pressure resistor 22 are not exposed to the outside. It is formed by the insulating material 31.

절연재(31)는 에폭시 수지와 같은 수지로 이루어지고, 용융된 상태에서, 상기 지지브래킷(11), 고압저항(21) 및 저압저항(22)이 외부로 노출되지 않도록 성형한다. 이때, 상기 지지브래킷(11)의 일부면을 여타 전력기기에 장착하기 위해서 외부로 노출되도록 한다.The insulating material 31 is made of a resin such as an epoxy resin, and is molded in a molten state so that the support bracket 11, the high pressure resistor 21, and the low pressure resistor 22 are not exposed to the outside. At this time, a portion of the support bracket 11 is exposed to the outside in order to mount to other power equipment.

상기 절연재(31)의 외표면에는 차폐층(32)이 구비되도록 한다. 상기 차폐 층(32)은 일정한 두께를 갖는 금속막으로 절연재(31)에 의해서 성형된 전자식 전압 변성기(1)의 외표면을 둘러싸도록 한다. 상기 차폐층(32)이 절연재(31)의 외표면 전체를 둘러싸도록 함으로써, 상기 차폐층(32)에 의해서 외부의 전계가 전자식 전압 변성기(1)의 내부에 영향을 미치지 않도록 한다.A shielding layer 32 is provided on an outer surface of the insulating material 31. The shielding layer 32 is a metal film having a constant thickness so as to surround the outer surface of the electronic voltage transformer 1 formed by the insulating material 31. The shielding layer 32 surrounds the entire outer surface of the insulating material 31 so that an external electric field does not affect the inside of the electronic voltage transformer 1 by the shielding layer 32.

한편, 저항소자로 이루어지는 변성기에는 커패시턴스(capacitance)성분이 존재하게 되고, 이러한 커패시턴스 성분에 의해서 위상오차가 발생하고, 상기 위상오차는 커패시턴스 값을 조절함으로써, 제어할 수 있다.On the other hand, a capacitance component is present in a transformer made of a resistance element, and a phase error occurs due to the capacitance component, and the phase error can be controlled by adjusting the capacitance value.

여기서, 상기 절연재(31)의 외표면으로 금속재질의 차폐층(32)이 구비되도록 하기 위해서는 절연재(31)의 외표면 전체에 대하여 메탈라이징(metalizing)하거나, 금속성 도료를 도포하거나, 금속박판을 부착하여 차폐층(32)이 형성되도록 한다.Here, in order to provide the shielding layer 32 made of a metal material on the outer surface of the insulating material 31, the entire outer surface of the insulating material 31 may be metalized, coated with a metallic paint, or a metal thin plate may be used. By attaching the shielding layer 32.

메탈라이징 공법은 물체의 표면에 금속을 용융시키면서 분사하여 도장하는 방법으로서, 메탈라이징 공법에 의해서 상기 절연재(31)의 외표면에 금속성의 차폐층(32)이 형성되도록 한다. 예컨대, 아연과 같은 금속을 가열하여 용융된 상태에서 절연재(31)로 분사함으로써, 상기 절연재(31)이 외표면에 금속성의 차폐층(32)이 형성되도록 한다.The metallizing method is a method of spraying and coating molten metal on the surface of an object, and the metallic shielding layer 32 is formed on the outer surface of the insulating material 31 by the metallizing method. For example, by heating a metal such as zinc and spraying the insulating material 31 in a molten state, the insulating material 31 allows the metallic shielding layer 32 to be formed on the outer surface.

금속성 도료를 도포하는 방법은 용제에 금속성분이 용해된 금속성 도료를 상기 절연재(31)의 외표면에 반복하여 도포함으로써, 금속성의 차폐층(32)이 형성되도록 한다.In the method of applying the metallic coating, the metallic shielding layer 32 is formed by repeatedly applying the metallic coating in which a metal component is dissolved in a solvent to the outer surface of the insulating material 31.

또한, 얇게 가공된 금속박판을 상기 절연재(31)의 외표면에 부착함으로써, 차폐층(32)을 구현할 수도 있다.In addition, by attaching a thin metal plate to the outer surface of the insulating material 31, the shielding layer 32 may be implemented.

상기와 같은 구성을 갖는 본 발명의 전자식 전압 변성기의 작용에 대하여 설명하면 다음과 같다.Referring to the operation of the electronic voltage transformer of the present invention having the configuration as described above are as follows.

지지브래킷(11)에 상호 소정의 비율의 저항값을 갖는 고압저항(21)과 저압저항(22)이 구비되고, 절연재(31)에 의해서 성형된 전자식 전압 변성기(1)의 외측에 금속성의 차폐층(32)이 형성되도록 하였다.The support bracket 11 is provided with a high voltage resistance 21 and a low voltage resistance 22 having a resistance value at a predetermined ratio to each other, and a metallic shield on the outside of the electronic voltage transformer 1 formed by the insulating material 31. Layer 32 was allowed to form.

이러한 전자식 전압 변성기는 상기 고압저항(21)의 입력측, 고압저항(21)과 저압저항(22)의 사이, 저압저항(22)의 출력측의 3개 지점에서 각각 전압을 측정하여, 각 지점간의 분압을 측정함으로써, 송전, 배전 선로의 전압을 측정하게 된다.The electronic voltage transformer measures voltages at three points on the input side of the high voltage resistor 21, between the high voltage resistor 21 and the low voltage resistor 22, and on the output side of the low voltage resistor 22, thereby dividing the voltage between the points. By measuring, the voltage of the power transmission and distribution lines is measured.

이때, 상기 절연재(31)의 외표면에 형성된 금속성의 차폐층(32)에 의해서, 외부의 전계가 상기 고압저항(21) 및 저압저항(22)에 영향을 미치는 것을 차단하게 된다. 상기 전자식 전압 변성기(1)는 전력기기에 장착되는 바, 전자식 전압 변성기(1)는 항상 외부 전계에 노출된 상태이다. 상기 금속성의 차폐층(32)은 외부 전계가 고압저항(21) 및 저압저항(22)에 전달되지 못하도록 외부 전계를 차폐함으로써, 상기 고압저항(21) 및 저압저항(22)을 통하여 분압을 측정할 때, 외부 전계의 영향을 받지 않은 상태에서 분압이 출력되도록 한다.At this time, by the metallic shielding layer 32 formed on the outer surface of the insulating material 31, an external electric field is blocked from affecting the high voltage resistance 21 and the low voltage resistance 22. The electronic voltage transformer 1 is mounted on a power device, and the electronic voltage transformer 1 is always exposed to an external electric field. The metallic shielding layer 32 measures the partial pressure through the high voltage resistance 21 and the low voltage resistance 22 by shielding the external electric field so that an external electric field is not transmitted to the high voltage resistance 21 and the low voltage resistance 22. In this case, the partial pressure is output without being influenced by an external electric field.

이상에서 살펴본 바와 같은 본 발명의 전자식 전압 변성기에 따르면, 전자식 전압 변성기의 외표면에 금속을 분사하여 차폐층을 형성함으로써, 외부 전계를 차폐할 수 있는 차폐층을 전자식 전압 변성기를 용이하게 제작할 수 있다.According to the electronic voltage transformer of the present invention as described above, by forming a shielding layer by spraying a metal on the outer surface of the electronic voltage transformer, it is possible to easily produce an electronic voltage transformer with a shielding layer that can shield the external electric field. .

또한, 외부의 전계에 대하여 영향을 받지 않으므로, 정확한 출력값이 출력되 도록 한다.In addition, since it is not affected by an external electric field, an accurate output value is output.

Claims (4)

지지브래킷;Support brackets; 서로 다른 저항값을 갖고, 서로 직렬 연결되며, 상기 지지브래킷에 절연되도록 한 쌍으로 구비되는 고압저항과 저압저항;A high voltage resistance and a low voltage resistance having a different resistance value and connected in series to each other and provided in a pair to insulate the support bracket; 상기 지지브래킷, 고압저항 및 저압저항을 둘러싸되, 상기 지지브래킷의 일측면은 노출되도록 성형되는 절연재; 및An insulating material surrounding the support bracket, a high pressure resistance, and a low pressure resistance, wherein one side of the support bracket is formed to be exposed; And 상기 절연재의 외표면을 둘러싸도록 형성되는 차폐층을 포함하는 전자식 전압 변성기.An electronic voltage transformer comprising a shielding layer formed to surround the outer surface of the insulating material. 제1항에 있어서,The method of claim 1, 상기 차폐층은 메탈라이징공법에 의해 형성되는 것을 특징으로 하는 전자식 전압 변성기.The shielding layer is an electronic voltage transformer, characterized in that formed by the metallizing method. 제1항에 있어서,The method of claim 1, 상기 차폐층은 금속재 도료를 도포하여 형성되는 것을 특징으로 하는 전자식 전압 변성기.The shielding layer is an electronic voltage transformer, characterized in that formed by applying a metal paint. 제1항에 있어서,The method of claim 1, 상기 차폐층은 금속박판을 부착하여 형성되는 것을 특징으로 하는 전자식 전 압 변성기.The shielding layer is an electronic voltage transformer, characterized in that formed by attaching a metal thin plate.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101099953B1 (en) 2010-04-09 2011-12-28 엘에스산전 주식회사 Composite Insulated Electronic Instrument Transformer
CN106645857A (en) * 2016-12-26 2017-05-10 陈永山 Three-phase electronic voltage transformer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000269043A (en) 1999-03-17 2000-09-29 Meidensha Corp Transformer
JP2002044567A (en) 2000-07-26 2002-02-08 Toshiba Corp Cathode ray tube system
KR200315371Y1 (en) 2003-03-17 2003-06-02 한국전기안전공사 Protective cover of MOF bushing
KR20030042938A (en) * 2001-11-26 2003-06-02 김연수 meter transformer for construction multi contactor from input terminal and plastic operation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000269043A (en) 1999-03-17 2000-09-29 Meidensha Corp Transformer
JP2002044567A (en) 2000-07-26 2002-02-08 Toshiba Corp Cathode ray tube system
KR20030042938A (en) * 2001-11-26 2003-06-02 김연수 meter transformer for construction multi contactor from input terminal and plastic operation method thereof
KR200315371Y1 (en) 2003-03-17 2003-06-02 한국전기안전공사 Protective cover of MOF bushing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101099953B1 (en) 2010-04-09 2011-12-28 엘에스산전 주식회사 Composite Insulated Electronic Instrument Transformer
CN106645857A (en) * 2016-12-26 2017-05-10 陈永山 Three-phase electronic voltage transformer

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