KR100508391B1 - Metering out fit have a current transformer within bushing - Google Patents

Metering out fit have a current transformer within bushing Download PDF

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Publication number
KR100508391B1
KR100508391B1 KR10-2003-0038833A KR20030038833A KR100508391B1 KR 100508391 B1 KR100508391 B1 KR 100508391B1 KR 20030038833 A KR20030038833 A KR 20030038833A KR 100508391 B1 KR100508391 B1 KR 100508391B1
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South Korea
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transformer
instrument
bushing
current transformer
current
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KR10-2003-0038833A
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Korean (ko)
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KR20040108090A (en
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구자열
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영화산업전기 주식회사
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20Instruments transformers
    • H01F38/22Instruments transformers for single phase ac
    • H01F38/34Combined voltage and current transformers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147Alloys characterised by their composition
    • H01F1/153Amorphous metallic alloys, e.g. glassy metals
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/02Casings
    • H01F27/022Encapsulation
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/32Insulating of coils, windings, or parts thereof
    • H01F27/321Insulating of coils, windings, or parts thereof using a fluid for insulating purposes only
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/32Insulating of coils, windings, or parts thereof
    • H01F27/327Encapsulating or impregnating

Abstract

본 발명은 변류기가 내장된 붓싱형 계기용변성기에 관한 것으로, 특히 저손실형 변류기를 붓싱 내부에 내장시킨 후 옥외용 합성수지에 의해 일체로 성형한 붓싱을 이용한 고신뢰성 계기용변성기에 관한 것이다. 본 발명에 따른 변류기가 내장된 붓싱형 계기용변성기는 복수개의 붓싱과, 상기 복수개의 붓싱 내부에 각각 내장되어 일체로 성형되는 계기용변류기와, 상기 복수개의 계기용변류기와 연결도체에 의해 각각 연결되며, 권체 외부는 합성수지로 절연처리되어 성형되는 계기용변압기와, 상기 복수개의 계기용변압기가 내장되며, 내부공간이 절연체로 충진되는 외함으로 구성되는 것을 특징으로 한다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bushing instrument transformer with a built-in current transformer, and more particularly, to a high reliability instrument transformer using a bushing integrally formed by an outdoor synthetic resin after embedding a low loss current transformer inside the bushing. Bushing-type instrument transformer with a current transformer according to the present invention is a plurality of bushings, each of the instrument current transformer is formed integrally formed inside each of the plurality of bushings and connected by the plurality of instrument current transformers and connecting conductors, respectively. The outside of the winding body is composed of an instrument transformer that is insulated and molded with synthetic resin, and the plurality of instrument transformers are built in, and an inner space is formed of an enclosure filled with an insulator.

Description

변류기가 내장된 붓싱형 계기용변성기{METERING OUT FIT HAVE A CURRENT TRANSFORMER WITHIN BUSHING}Bushing-type instrument transformer with built-in current transformer {METERING OUT FIT HAVE A CURRENT TRANSFORMER WITHIN BUSHING}

본 발명은 변류기가 내장된 붓싱형 계기용변성기에 관한 것으로, 특히 저손실형 변류기를 붓싱 내부에 내장시킨 후 옥외용 합성수지에 의해 일체로 성형한 붓싱을 이용한 고신뢰성 계기용변성기에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bushing instrument transformer with a built-in current transformer, and more particularly, to a high reliability instrument transformer using a bushing integrally formed by an outdoor synthetic resin after embedding a low loss current transformer inside the bushing.

통상적으로 계기용변성기(Metering Out Fit: MOF)는 최대수요 전력량계와 조합결선되어 주로 산업용 수용가 및 공장, 빌딩 등의 사용 전력량의 측정에 따른 전기요금의 정확한 산정과 수불을 위해 고전압을 저전압으로 변성하는 계기용변압기(Potential Transformer: PT)와, 고전류를 저전류로 정밀하게 변성하는 계기용변류기(Current Transformer: CT)의 조합에 의해 최대수요 전력량계를 정확히 작동하게 하기 위한 전기기기로 사용되고 있다. 특히, 3상용 변류기에서는 2개의 변류기와 2개의 계기용변압기 또는 1개의 3상용 계기용변압기로 되어 있어 적산 전력계 등과 조합하여 수급된 전력량을 측정을 할 때의 변성장치로서 주로 사용된다.In general, the metering out fit (MOF) is combined with the maximum demand electricity meter to convert the high voltage into low voltage for accurate calculation and collection of electricity charges based on the measurement of the power consumption of industrial consumers and factories and buildings. The combination of a Potential Transformer (PT) and a Current Transformer (CT) that precisely transforms high current into low current is used as an electric device to operate the maximum demand electricity meter accurately. In particular, the three-phase current transformer is composed of two current transformers, two instrument transformers or one three-phase instrument transformer, and is mainly used as a transformer for measuring the amount of power supplied in combination with an integrated power meter.

그리고, 계기용변압기는 고전압을 직접 전압계로 측정하는 것은 위험하기도 하고 전압계의 절연으로 보아 대단히 비경제적이기 때문에 보통 2차측을 100[V]로 한 변압기를 사용하는 용도로써 이용된다. 이와 같이 사용되는 계기용변압기의 종류에는 건식, 유입식 그리고 가스식으로 대별할 수 있다.Instrument transformers are usually used for the use of transformers with a secondary voltage of 100 [V] because measuring the high voltage directly with a voltmeter is dangerous and very inexpensive from the voltmeter's insulation. The types of instrument transformers used in this way can be roughly classified into dry, inflow and gas.

그리고, 계기용변류기는 어떤 전류값을 이에 비례하는 전류값으로 변성하는 계기용변성기를 말한다. 일반적으로 사용하는 보통의 계기, 보호계전기 등의 정격입력전류는 5[A]의 것이 많으나 근래에 개발되어 그 보급이 확산되고 있는 디지털용 계전기 등의 정격입력전류는 1[A]의 것으로 제작되는 등 1차측의 대전류를 직접 계측할 수 없으므로 전류를 일정비율로 낮춰 계기의 계측이 가능하도록 하는 변성기이다.In addition, the instrument current transformer refers to an instrument transformer for modifying a certain current value to a current value proportional thereto. In general, the rated input current of general instruments and protective relays is 5 [A], but the rated input current of digital relays, which have been developed and spread in recent years, is manufactured to be 1 [A]. As it is impossible to directly measure the large current on the primary side, it is a transformer that can measure the instrument by lowering the current to a certain ratio.

이와 같은 종래의 계기용변성기의 일예를 도 1 및 도 2를 참조하여 설명한다.An example of such a conventional instrument transformer will be described with reference to FIGS. 1 and 2.

도 1은 종래의 계기용변성기를 나타내는 정면도이고, 도 2는 도 1의 계기용변성기의 내부구조를 나타내는 도면이다.1 is a front view showing a conventional instrument transformer, Figure 2 is a view showing the internal structure of the instrument transformer of Figure 1;

이에 의하면, 계기용변성기의 상부는 3개의 애관형 자기(porcelain)붓싱(1,2,3)과 1개의 접지붓싱(4)으로 구성되며, 3개의 붓싱내부 각각은 애관으로 내경속에는 에어(air)로 차 있는 바, 애관 내부에는 대전류가 유입(incoming)되는 1차측 동봉(5)과, 1차측 동봉(5)으로부터 유입되어 계기용변류기(7)를 통해 유출될 수 있도록 한 유출용 동파이프(6)가 설치되어 있다. 특히, 1차측 동봉(5)과 유출용 동파이프(6)간에는 공기절연에 의해 절연상태를 유지하도록 되어 있으며, 각각의 붓싱 상부에는 1차측 동봉(5)과 유출용 동파이프(6)에 각각 연결되는 동재질로 된 입력단자(8)와 출력단자(9)가 형성되어 있다.According to this, the upper part of the instrument transformer is composed of three pipe-type porcelain porcelains (1, 2, 3) and one ground bushing (4), and each of the three bushings is a duct and air at the inner diameter. ), The copper pipe for outflow, which flows from the primary side rod (5) and the primary side rod (5) into which the large current is introduced and flows out through the instrument current transformer (7). (6) is provided. In particular, between the primary side bar (5) and the outflow copper pipe (6) to maintain the insulation state by air insulation, each of the upper bushings on the primary side bar (5) and outflow copper pipe (6) The input terminal 8 and the output terminal 9 made of the same material to be connected are formed.

또한, 접지형 붓싱(4) 내부 역시 비어있는 애관으로 접지를 위하여 1개의 PVC전선(10)만이 외함접지되어 있다.In addition, only one PVC wire 10 is grounded for the grounding of the ground type bushing 4, which is also an empty pipe.

이어서, 계기용변성기의 하부를 살펴보면, 철제탱크(11) 내부에는 계기용변성기의 상부에 형성되어 있는 애관형 자기붓싱의 개수와 동일한 개수의 변류기권체(7)와 변압기권체(12)가 배치되어 있다. 특히, 변류기권체(7)는 변류비에 따라 1차권선과 2차권선을 하고 그 중심으로 규소강판으로 된 철심(13)이 통과하며, 변압기권체(12)는 5 내지 6층의 1차권선(14)과 그 내부에 2차권선(미도시됨)을 하고 그 중심에 철심(15)이 통과되어 설치되어진다.Subsequently, looking at the lower part of the instrument transformer, the current transformer body 7 and the transformer body 12 of the same number as the number of tube-type magnetic bushings formed on the upper portion of the instrument transformer are disposed in the steel tank 11. have. In particular, the current transformer body (7) is the primary winding and the secondary winding in accordance with the current flow ratio, the core 13 of the silicon steel sheet passes through the center, the transformer winding 12 is the primary winding of the 5-6 layer (14) and a secondary winding (not shown) inside and iron core 15 is passed through the center is installed.

또한, 붓싱 밑면에는 동판과 변류기(7) 및 변압기(12)의 1차측 리드선이 연결되고 변류기(7)와 변압기(12)의 2차측 리드선은 최대수요 전력량계(미도시)와 접속되는 2차단자박스(16)로 인출결선되어진다.In addition, a secondary terminal is connected to the bottom of the bushing to connect the primary lead wire of the copper plate, the current transformer 7, and the transformer 12, and the secondary lead wire of the current transformer 7 and the transformer 12 is connected to the maximum demand power meter (not shown). The lead is drawn out to the box 16.

그리고, 철제탱크(11)의 내부는 상간 도전부간의 절연을 위하여 절연유(insulation oil: OT)로 충진되어 있다.The inside of the iron tank 11 is filled with an insulation oil (OT) to insulate between the conductive portions between phases.

이러한 구조를 갖는 종래의 계기용변성기는 자기붓싱을 운반하거나 설치하는 중 쉽게 깨질수 있으며, 붓싱 내부는 공기절연으로 1차측 도체와 붓싱 내벽을 포함한 접지간 미세한 기중 및 연면 부분방전으로 인하여 자기붓싱의 수명이 짧아지는 문제점이 있었다.Conventional instrument transformers having such a structure can be easily broken while carrying or installing the magnetic bushings. The inside of the bushings is air insulation, and due to the minute air and creepage partial discharges between the ground including the primary conductor and the inner wall of the bushings, There was a problem that the life is shortened.

또한, 철제탱크(11)의 내부에 배치되어 있는 변류기(7)와 변압기(12) 역시 철제탱크(11)의 내부에 충진되어 있는 절연유에 의해서만 절연을 유지함으로 인하여 절연유에 공기 또는 습기 등이 내재될 경우 부분방전으로 사용수명이 단축될뿐만 아니라, 변류기와 변압기권체 자체에서도 부분방전이 일어날 수 있다는 문제점이 있었다.In addition, since the current transformer 7 and the transformer 12 disposed inside the iron tank 11 also maintain insulation only by the insulating oil filled in the iron tank 11, air or moisture is inherent in the insulating oil. In this case, there is a problem that the partial discharge may not only shorten the service life but also cause partial discharge in the current transformer and the transformer body itself.

특히, 자기붓싱부분과 변류기 권체가 거리를 두고 이격되어 설치됨으로 인하여 작업공수가 많아질 뿐 아니라, 접속 또는 용접개소에서 발생되는 부분방전은 변성기의 수명을 단축시키는 원인이 되었다.In particular, since the magnetic bushing part and the current transformer body are spaced apart from each other, the number of working hours increases, and partial discharge generated at the connection or welding point causes shortening of the life of the transformer.

또한, 변류기(7)와 변압기(12)의 철심(core)으로 두께가 두꺼운 방향성 규소강판을 사용함으로 인하여 점유면적이 넓어지게 될뿐 아니라, 철손이 많아져 자체전력 소모가 많아진다는 문제점이 있었다.In addition, due to the use of thick oriented silicon steel sheets as cores of the current transformer 7 and the transformer 12, the occupied area is not only widened, but the iron loss is increased, thereby increasing its own power consumption.

따라서, 본 발명의 목적은 상술한 문제점을 해소하기 위한 것으로, 붓싱 내부에 변류기를 내장하여 에폭시 등의 옥외용 합성수지로 진공성형된 붓싱을 사용함으로써 쉽게 깨지지 않으며 부분방전이 일어나지 않도록 한 계기용변성기를 제공함에 있다.Accordingly, an object of the present invention is to solve the above-described problems, by providing a current transformer in the bushing by using a vacuum molded bushing with an outdoor synthetic resin such as epoxy so that it is not easily broken and partial discharge does not occur. Is in.

또한, 본 발명의 다른 목적은 탱크 내부 설치된 변압기 권체 역시 에폭시 등의 합성수지로 진공성형하고 탱크 내부에는 절연유나 절연가스를 충진하여 이중절연상태를 유지함으로써 부분방전이 일어나지 않아 반영구적으로 사용할 수 있도록 한 계기용변성기를 제공함에 있다.In addition, another object of the present invention is the transformer winding installed inside the tank is also vacuum-molded with a synthetic resin such as epoxy and filled with insulating oil or insulating gas inside the tank to maintain a double insulation state, so that partial discharge does not occur instrument that can be used semi-permanently To provide a denatured group.

또한, 본 발명의 또 다른 목적은 상술한 바와 같이 변류기를 붓싱과 일체형으로 제조함으로써 작업공수가 줄어들며 접속이나 용접개소로부터 발생되는 부분방전을 방지할 수 있도록 한 계기용변성기를 제공함에 있다.In addition, another object of the present invention is to provide a transformer for the instrument to reduce the number of work and prevent partial discharge generated from the connection or welding location by manufacturing the current transformer integrally with the bushing as described above.

또한, 본 발명의 또 다른 목적은 변류기의 철심으로 두께가 두꺼운 방향성 규소강판이 아닌 저손실형, 경량의 아몰퍼스코어를 사용함으로써 전력소모가 최소화될 수 있도록 한 계기용변성기를 제공함에 있다.In addition, another object of the present invention is to provide a transformer for instrument to minimize the power consumption by using a low-loss, lightweight amorphous core instead of a thick oriented silicon steel sheet as the iron core of the current transformer.

상기 목적을 달성하기 위한 본 발명의 변류기가 내장된 붓싱형 계기용변성기는 복수개의 붓싱과, 상기 복수개의 붓싱 내부에 각각 내장되어 일체로 성형되는 계기용변류기와, 상기 복수개의 계기용변류기와 연결도체에 의해 각각 연결되며, 권체 외부는 합성수지로 절연처리되어 성형되는 계기용변압기와, 상기 복수개의 계기용변압기가 내장되며, 내부공간이 절연체로 충진되는 외함으로 구성된다.Bushing-type instrument transformer with a current transformer of the present invention for achieving the above object is a plurality of bushings, instrument current transformers are formed integrally formed in each of the plurality of bushings and connected to the plurality of instrument current transformers Connected by conductors, the winding body is composed of an instrument transformer, which is insulated and molded with synthetic resin, and a plurality of instrument transformers, and an inner space filled with an insulator.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 3은 본 발명의 실시예에 의한 변류기가 내장된 붓싱형 계기용변성기의 정면도이고, 도 4는 도 3의 계기용변성기의 내부구조를 나타내는 도면이다.3 is a front view of a bushing instrument transformer with a current transformer according to an embodiment of the present invention, Figure 4 is a view showing the internal structure of the instrument transformer of Figure 3;

도시된 바와 같이, 본 발명의 계기용변성기는 종래와 마찬가지로 상부와 하부구조로 구분된다. 상부는 3개의 옥외용 붓싱(20,30,40)과 1개의 접지형 붓싱(미도시됨)으로 구성되며, 하부는 외함(50)내에 계기용변압기(60,70,80)가 설치되는 구성을 갖는다. 특히, 3개의 옥외용 붓싱(20,30,40)은 동일한 구조를 갖는 것으로 하기의 설명에서는 하나의 옥외용 붓싱(20)만을 예로 하여 그 구조에 대해 설명하기로 한다.As shown, the instrument transformer of the present invention is divided into upper and lower structures as in the prior art. The upper part is composed of three outdoor bushings (20, 30, 40) and one ground type bushing (not shown), and the lower part has a configuration in which instrument transformers (60, 70, 80) are installed in the enclosure (50). Have In particular, the three outdoor bushings 20, 30, and 40 have the same structure, and in the following description, only one outdoor bushing 20 will be described as an example.

본 발명의 옥외용 붓싱(20)은 고압, 고전류의 전기를 받아들이기 위해 계기용변류기(90)가 내장되어 에폭시 등의 합성수지로 성형되며, 미도시된 접지형 붓싱 역시 옥외용 붓싱(20)과 동일한 에폭시 등의 합성수지에 의해 성형된다. 특히, 계기용변류기(90)가 내장된 옥외용 붓싱(20)의 제조과정에 대해서는 하기에서 상세히 설명하기로 한다.Outdoor bushing 20 of the present invention is built in the instrument current transformer 90 to receive electricity of high pressure, high current is molded into a synthetic resin, such as epoxy, not shown ground type bushing is also the same epoxy as the outdoor bushing 20 It is molded by synthetic resins, such as these. In particular, the manufacturing process of the outdoor bushing 20 is built in the instrument current transformer 90 will be described in detail below.

옥외용 붓싱(20)은 옥외형 에폭시 등의 합성수지로 기공없이 완전 밀폐되어 진공탈포된 성형물로써, 그 내부에 내장된 계기용변류기(90)는 아몰퍼스 철심(91)과, 아몰퍼스 철심(91)에 권선되어 연결되는 1차 도체(92)와, 변류기 2차측으로부터 인출되어 외함(50) 측면에 설치되어 있는 2차단자박스(100)내의 단자와 연결되는 리드선을 통해 1차 도체(92)를 통한 고전류로부터 유기되어 발생되는 5[A]의 전류를 전력량계(미도시됨)와 연결되어 있는 2차단자박스(100)로 전달하는 2차 도체(93)를 구비하고, 1차 도체(92)에는 외부로부터 입력되는 전류를 입력받기 위한 입력단자(21)와 입력단자(21)로 입력된 1차전류를 외부의 다른 기기로 출력하기 위한 출력단자(22)가 연결되어 있다.The outdoor bushing 20 is a vacuum degassed molding that is completely sealed without pores with synthetic resin such as outdoor epoxy, and the instrument current transformer 90 embedded therein is wound around the amorphous iron core 91 and the amorphous iron core 91. High current through the primary conductor 92 through a primary conductor 92 connected to the main conductor 92 and a lead wire drawn from the secondary side of the current transformer and connected to a terminal in the secondary terminal box 100 installed on the side of the enclosure 50. A secondary conductor (93) for transmitting a current of 5 [A] generated from the secondary to the secondary terminal box (100) connected to a wattmeter (not shown), and the primary conductor (92) has an external An input terminal 21 for receiving a current input from the output terminal 22 and an output terminal 22 for outputting a primary current input through the input terminal 21 to another external device are connected.

물론, 2차단자박스(100)내의 단자로부터 인출되는 리드선은 최대수요 전력량계(미도시됨)와 결선되어 작동하게 된다.Of course, the lead wire drawn out from the terminal in the secondary terminal box 100 is connected to the maximum demand power meter (not shown) to operate.

여기서, 이러한 옥외용 붓싱(20)의 제조과정을 설명하면, 먼저, 옥외용 붓싱(20) 형상의 금형을 제작한 후, 금형내에 상술한 바와 같은 구조를 갖는 계기용변류기(90)를 내장시키고 에폭시와 같은 합성수지를 금형내에 부어 계기용변류기(90)와 옥외용 붓싱(20)이 일체로 제조되는 것이다.Herein, the manufacturing process of the outdoor bushing 20 will be described. First, a mold having the shape of the outdoor bushing 20 is manufactured, and then, the instrument current transformer 90 having the structure as described above is embedded in the mold, and the epoxy and The same synthetic resin is poured into the mold, and the instrument current transformer 90 and the outdoor bushing 20 are integrally manufactured.

특히, 금형내에서 성형된 옥외용 붓싱(20)을 완전 탈포시킨 후에는 70℃ 내지 90℃에서 6시간이상 1차 경화한 후, 120℃ 내지 130℃에서 12시간 이상으로 2차경화하여 상온으로 자연 복귀함으로써 자기(porcelain) 붓싱에 비하여 기계적인 강도가 유연하게 되어 종래와 같이 쉽게 깨지지 않을 뿐 아니라, 내부가 완전 밀폐되어 기포가 전무하게 됨으로써 부분방전이 거의 일어나지 않게 되어 반영구적으로 사용할 있게 되는 것이다.In particular, after completely degassing the outdoor bushing 20 molded in the mold, the first curing at 70 ℃ to 90 ℃ for 6 hours or more, and then secondary curing at 120 ℃ to 130 ℃ for more than 12 hours to natural at room temperature By returning, mechanical strength becomes more flexible than porcelain bushing, and it is not easily broken as in the prior art, and since the inside is completely sealed and there are no bubbles, partial discharge hardly occurs and thus it can be used semi-permanently.

또한, 계기용변류기(90)에 사용된 철심(91)은 비정질 자성재료인 아몰퍼스메탈을 사용하여 기존에 사용되던 방향성 규소강판에 비해 철손 및 철심두께가 줄어들 수 있도록 하였다.In addition, the iron core 91 used in the instrument current transformer 90 is made of amorphous metal material amorphous metal to reduce the iron loss and iron core thickness compared to the conventional oriented silicon steel sheet used.

한편, 계기용변성기의 하부에 형성되어 있는 외함(50)내에는 계기용변압기(60)가 내장된다. 이와 같이 외함(50)내에 내장된 계기용변압기(60)의 1차 권선체는 상술한 계기용변류기(90)의 1차 도체(92)의 전압인출단자(61)와 연결되어 있는 연결도체(62)에 의해 연결된다.On the other hand, the instrument transformer 60 is built in the enclosure 50 formed in the lower portion of the instrument transformer. As such, the primary winding of the instrument transformer 60 embedded in the enclosure 50 is connected to the voltage drawing terminal 61 of the primary conductor 92 of the instrument transformer 90 described above ( 62).

이에 따라, 계기용변류기(90)의 1차 도체(92)로부터 공급되는 전압은 연결도체(62)를 통해 계기용변압기(60)의 1차 권선체로 전달되어 2차 권선체로부터 강압된 110[V]의 전압이 계기용변압기(60)의 2차측 리드선을 통해 외함(50) 측면에 설치되어 있는 2차단자박스(100)내의 단자로 전달되게 된다.Accordingly, the voltage supplied from the primary conductor 92 of the instrument current transformer 90 is transmitted to the primary winding of the instrument transformer 60 through the connecting conductor 62 and stepped down from the secondary winding. The voltage of V] is transmitted to the terminal in the secondary terminal box 100 which is installed on the side of the enclosure 50 through the secondary lead wire of the instrument transformer 60.

물론, 2차단자박스(100)내의 단자로부터 인출되는 리드선은 최대수요 전력량계(미도시됨)와 결선되어 작동하게 된다.Of course, the lead wire drawn out from the terminal in the secondary terminal box 100 is connected to the maximum demand power meter (not shown) to operate.

특히, 본 발명에서는 계기용변압기(60)의 권체(active part)인 1차 및 2차 권선체를 에폭시(epoxy)등의 옥내용 합성수지로 성형(moding)하고, 외함(50) 내부에 절연유 또는 절연가스를 충진함으로써 종전에 많이 발생하였던 부분방전을 완전히 방지하여 반영구적인 사용수명을 갖도록 하였다.Particularly, in the present invention, the primary and secondary windings, which are the active parts of the instrument transformer 60, are modified with an indoor synthetic resin such as epoxy, and insulating oil or By filling the insulating gas, partial discharge, which has occurred a lot in the past, is completely prevented to have a semi-permanent service life.

이어서, 상술한 본 발명의 에폭시 타입의 계기용변성기와, 종래의 유입식 변성기의 부분방전 측정 비교데이터를 표 1을 참고하여 설명하면 다음과 같다.Subsequently, the partial discharge measurement comparison data of the above-described epoxy type instrument transformer of the present invention and a conventional inlet transformer will be described with reference to Table 1 below.

NONO 품명Product Name 발생전압(kV)Generated voltage (kV) 부분방전량(pc)최고전압(at 40 kV)Partial discharge amount (pc) Maximum voltage (at 40 kV) 부분방전량(pc)측정전압1(at 24 kV)Partial discharge amount (pc) Measuring voltage 1 (at 24 kV) 부분방전량(pc)측정전압2(at 16.6 kV)Partial discharge amount (pc) measured voltage 2 (at 16.6 kV) 소멸전압(kV)Dissipation Voltage (kV) 기준: 50pcStandard: 50pc 기준: 20pcStandard: 20pc 1One 유입식24kV급150/5AInflow 24kV class 150 / 5A 20.320.3 1000 이상More than 1000 1000 이상More than 1000 freefree 20.020.0 22 건식(Epoxy)24kV급250/5ADry 24kV 250 / 5A 36.636.6 4040 freefree freefree 26.326.3

표 1에 나타난 바와 같이, 종래의 계기용변성기는 유입식 24kV급 150/5A를 대상으로 하고, 본 발명의 에폭시 타입의 계기용변성기는 건식(Epoxy) 24kV급 250/5A인 것을 측정 대상으로 하였다.As shown in Table 1, the conventional instrument transformer was subjected to the inflow type 24kV class 150 / 5A, the epoxy type instrument transformer of the present invention was measured to be epoxy (24kV class 250 / 5A). .

먼저, 발생전압은 코로나 방전이 개시되는 전압으로써, 종래 유입식의 경우에는 20.3kV로 측정되었으며, 본 발명의 건식의 경우에는 36.6kV로 측정되었다. 이에서 알 수 있는 바와 같이, 본 발명의 건식용 변성기가 종래의 유입식 변성기에 비해 우수함을 알 수 있다.First, the generated voltage was a voltage at which corona discharge was started, and was measured at 20.3 kV in the conventional inflow type, and was measured at 36.6 kV in the dry type of the present invention. As can be seen from this, it can be seen that the dry transformer of the present invention is superior to the conventional inlet transformer.

그리고, 부분방전량은 변성기에 인가되는 전압을 최고전압 40kV에서 시작하여 점차적으로 다운시켜 24kV와 16.6kV에서 각각의 부분방전량을 측정하였으며, 방전량의 단위로는 PC(Pico Coulomb)를 사용한다.The partial discharge amount starts from the maximum voltage of 40kV and gradually decreases the voltage applied to the transformer to measure the partial discharge amount at 24kV and 16.6kV, respectively, and PC (Pico Coulomb) is used as a unit of discharge amount. .

그 결과, 최고전압 40kV에서 종래 유입식의 경우, 부분방전량이 1000pc 이상으로 측정되었으며, 본 발명의 건식의 경우에는 40pc의 값으로 측정되었다. 이처럼, 종래의 유입식 변성기는 본 발명의 변성기에 비해 부분방전량이 매우 크다는 것을 알 수 있다.As a result, in the case of the conventional inflow type at a maximum voltage of 40 kV, the partial discharge amount was measured to be more than 1000pc, in the case of the dry type of the present invention was measured to a value of 40pc. As such, it can be seen that the conventional inflow-type transformer has a very large partial discharge amount compared to the transformer of the present invention.

또한, 24kV에서 종래 유입식의 경우, 부분방전량이 최고전압 40kV일때와 마찬가지로 1000pc로 측정되었으며, 본 발명의 건식의 경우에는 free(0)로 측정되었다. 이 때, 부분방전량이 50pc 이하의 값으로 측정되어야 정상이지만, 측정 결과에서 알 수 있는 바와 같이, 50pc 이상의 값으로 측정된 종래 유입식 변성기는 기준 방전량을 훠씬 초과할 수 있음을 알 수 있다. 이에 반해, 본 발명의 건식용 변성기는 free(0)로써 부분방전이 전혀 발생되지 않음을 알 수 있다.In addition, in the case of the conventional inflow type at 24kV, the partial discharge amount was measured as 1000pc as in the case of the highest voltage 40kV, and in the dry type of the present invention was measured as free (0). At this time, the partial discharge amount is normal to be measured at a value of 50pc or less, but as can be seen from the measurement results, it can be seen that the conventional inflow-type transformer measured at a value of 50pc or more may far exceed the reference discharge amount. On the contrary, it can be seen that the dry transformer of the present invention does not generate any partial discharge as free (0).

이어서, 16.6kV에서는 종래 유입식과 본 발명의 건식용 변성기의 부분방전량이 모두 free(0)로 측정되었다.Subsequently, at 16.6 kV, the partial discharge amount of both the conventional inflow type and the dry transformer of the present invention was measured as free (0).

한편, 소멸전압은 부분방전이 소멸되는 전압으로써, 종래 유입식의 경우에는 20.0kV로 측정되었으며, 본 발명의 건식의 경우에는 26.3kV로 측정되었다. 이 때, 소멸전압은 고전압일수록 바람직하다. 따라서, 본 발명의 건식용 변성기가 종래의 유입식 변성기에 비해 우수함을 알 수 있다.On the other hand, the extinction voltage is a voltage at which the partial discharge is extinguished, was measured as 20.0kV in the case of conventional inflow type, it was measured as 26.3kV in the dry type of the present invention. At this time, the extinction voltage is preferably higher voltage. Therefore, it can be seen that the dry transformer of the present invention is superior to the conventional inlet transformer.

특히, 24kV와 16.6kV에서 각각 측정되는 부분방전량은 변성기의 합격품과 불합격품을 결정짓는 중요한 값으로, 각각의 전압 모두에서 기준방전량을 초과하는 경우 불합격품으로 처리된다. 그러나, 상술한 바와 같이 본 발명의 건식용 변성기는 24kV와 16.6kV에서 부분방전량이 모두 "0" 값으로 측정되어 부분방전이 전혀 발생되지 않음을 알 수 있다.In particular, the partial discharge measured at 24kV and 16.6kV, respectively, is an important value that determines the acceptance and rejection of the transformer, and it is treated as rejected when the reference discharge is exceeded at each voltage. However, as described above, it can be seen that the dry transformer of the present invention measures both partial discharge amounts at a value of "0" at 24 kV and 16.6 kV, so that no partial discharge occurs.

한편 본 발명의 상세한 설명에서는 구체적인 실시예에 관해 설명하였으나, 본 발명의 범위에서 벗어나지 않는 한도 내에서 여러 가지 변형이 가능함은 물론이다. 그러므로 본 발명의 범위는 설명된 실시예에 국한되어 정해져서는 아니되며 후술하는 특허청구의 범위뿐만 아니라 이 특허청구의 범위와 균등한 것들에 의해 정해져야 한다.Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

상술한 바와 같이, 본 발명에 따르면, 붓싱 내부에 변류기를 내장하여 에폭시 등의 옥외용 합성수지로 진공성형된 붓싱을 사용함으로써 쉽게 깨지지 않으며 부분방전이 일어나지 않아 사용 수명이 길어지게 되는 효과가 있다.As described above, according to the present invention, by using a vacuum molded bushing with an outdoor synthetic resin such as epoxy by embedding a current transformer inside the bushing, it is not easily broken, and partial discharge does not occur, thereby increasing the service life.

또한, 탱크 내부 설치된 변압기 권체 역시 에폭시 등의 합성수지로 진공성형하고 탱크 내부에는 절연유나 절연가스를 충진하여 이중절연상태를 유지함으로써 부분방전이 일어나지 않아 반영구적으로 사용할 수 있는 효과가 있다.In addition, the transformer winding installed inside the tank is also vacuum-molded with a synthetic resin such as epoxy and filled with insulating oil or insulating gas inside the tank to maintain a double insulation state so that partial discharge does not occur and thus can be used semi-permanently.

또한, 변류기를 붓싱과 일체형으로 제조함으로써 작업공수가 줄어들며 접속이나 용접개소로부터 발생되는 부분방전을 방지함으로써 사용수명을 장기화할 수 있는 효과가 있다.In addition, since the current transformer is manufactured integrally with the bushing, the work man-hours are reduced, and there is an effect of prolonging the service life by preventing partial discharge generated from the connection or the welding location.

또한, 변류기의 철심으로 두께가 두꺼운 방향성 규소강판이 아닌 저손실형, 경량의 아몰퍼스코어를 사용함으로써 전력소모가 최소화되는 효과가 있다.In addition, power consumption is minimized by using a low loss type, lightweight amorphous core instead of thick oriented silicon steel sheet as the iron core of the current transformer.

도 1은 종래의 계기용변성기를 나타내는 정면도.1 is a front view showing a conventional instrument transformer.

도 2는 도 1의 계기용변성기의 내부구조를 나타내는 도면.2 is a view showing the internal structure of the instrument transformer of Figure 1;

도 3은 본 발명의 실시예에 의한 변류기가 내장된 붓싱형 계기용변성기의 정면도.3 is a front view of a bushing instrument transformer with a built-in current transformer according to an embodiment of the present invention.

도 4는 도 3의 계기용변성기의 내부구조를 나타내는 도면.4 is a view showing the internal structure of the instrument transformer of Figure 3;

< 도면의 주요부분에 대한 부호 설명><Explanation of Signs of Major Parts of Drawings>

20,30,40 : 옥외용 붓싱 21 : 입력단자20,30,40: Outdoor bushing 21: Input terminal

22 : 출력단자 50 : 외함22: output terminal 50: enclosure

60,70,80 : 계기용변압기 61 : 전압인출단자60,70,80: Instrument transformer 61: Voltage drawing terminal

62 : 연결도체 90 : 계기용변류기62: connecting conductor 90: instrument current transformer

91 : 아몰퍼스 철심 92 : 1차 도체91: amorphous iron core 92: primary conductor

93 : 2차 도체 100 : 2차단자박스93: secondary conductor 100: secondary terminal box

Claims (6)

복수개의 붓싱과,Multiple bushings, 상기 복수개의 붓싱 내부에 각각 내장되어 일체로 성형되는 계기용변류기와,Instrument current transformers are formed integrally with each other in the plurality of bushings, 상기 복수개의 계기용변류기와 연결도체에 의해 각각 연결되며, 권체 외부는 합성수지로 절연처리되어 성형되는 계기용변압기와,It is connected to each of the plurality of instrument current transformers and the connecting conductor, the outside of the winding body is formed by insulated with a synthetic resin molded; 상기 복수개의 계기용변압기가 내장되며, 내부공간이 절연체로 충진되는 외함으로 구성되는 것을 특징으로 하는 변류기가 내장된 붓싱형 계기용변성기.Bushing-type instrument transformer with a built-in current transformer, characterized in that the plurality of instrument transformer is built, the inner space is composed of an enclosure filled with an insulator. 제 1항에 있어서,The method of claim 1, 상기 복수개의 붓싱은 합성수지에 의해 성형된 것을 특징으로 하는 변류기가 내장된 붓싱형 계기용변성기.The bushing type instrument transformer with a current transformer, characterized in that the plurality of bushings are molded by a synthetic resin. 제 1 항에 있어서,The method of claim 1, 상기 계기용변류기에 사용되는 철심은 저손실형 아몰퍼스 철심인 것을 특징으로 하는 변류기가 내장된 붓싱형 계기용변성기.The iron core used in the instrument current transformer is a bushing-type instrument transformer with a current transformer, characterized in that the low-loss amorphous iron core. 삭제delete 제 1 항에 있어서,The method of claim 1, 상기 외함 내부에 충진되는 절연체는 절연유인 것을 특징으로 하는 변류기가 내장된 붓싱형 계기용변성기.Bushing-type instrument transformer with a current transformer, characterized in that the insulator filled in the enclosure is insulating oil. 제 1 항에 있어서,The method of claim 1, 상기 외함 내부에 충진되는 절연체는 절연가스인 것을 특징으로 하는 변류기가 내장된 붓싱형 계기용변성기.Bushing-type instrument transformer with a current transformer, characterized in that the insulator filled in the enclosure is an insulating gas.
KR10-2003-0038833A 2003-06-16 2003-06-16 Metering out fit have a current transformer within bushing KR100508391B1 (en)

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KR101133107B1 (en) 2011-08-23 2012-04-06 조영숙 Instrument transformer comprising high voltage ct and low voltage pt , all in one transformer using the same, and all in one incoming and distributing pannel using the same

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KR100923292B1 (en) * 2009-03-24 2009-10-23 구석환 MOF equipped with pressure discharging plate
KR102246709B1 (en) * 2019-09-18 2021-04-29 엘에스일렉트릭(주) Bushing type current transformer and switchgear assembly equipped with the circuit transformer

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101133107B1 (en) 2011-08-23 2012-04-06 조영숙 Instrument transformer comprising high voltage ct and low voltage pt , all in one transformer using the same, and all in one incoming and distributing pannel using the same

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