KR101024729B1 - Metering out fit - Google Patents

Abstract

The present invention seeks to provide an instrumental transformer current transformer suitable for use in connection to a solid insulated switchgear, wherein the instrument transformer current transformer can be electrically insulated from a connection of incoming power. An enclosure made of mold water having insulation; An interface unit for introducing external power in a state in which the electronic device is embedded in the enclosure and electrically insulated; An instrument transformer, which is embedded in the enclosure and steps down the voltage of the external power introduced into the inlet interface unit to provide as a measurement voltage; An instrument current transformer embedded in the enclosure for providing an output of a measurement current signal proportional to a current of external power drawn into the inlet interface unit; And a secondary terminal electrically connected to the instrument transformer and the instrument current transformer, and configured to output the measurement voltage and the measurement current signal.

Solid state isolation switchgear, transformer current transformer for instrument, MOF (METERING OUT FIT), insulation

Description

Transformer current transformers for instruments {METERING OUT FIT}

TECHNICAL FIELD The present invention relates to a solid insulated switchgear, and more particularly, to a transformer transformer current transformer (METERING OUT FIT) having a solid insulated switchgear interface (INTERFACE) suitable for use in connection with a solid insulated switchgear. will be.

Solid-state insulated switchgear is an ultra-high voltage substation that handles tens to hundreds of kilovolts of ultra-high voltage. The sulfur hexafluoride (SF6) gas used as insulation gas adversely affects global warming. This is the next generation of distribution switchgear that will replace the existing gas insulated switchgear that used this regulated gas. In addition, solid-state isolation switchgear is a power device for substation and / or distribution that performs functions such as monitoring, controlling, protecting, and measuring power system, and is a circuit breaker, disconnecting switch, and earth breaker. Insulating the switchgear with the main components such as switches, bus bars, current and voltage meters, etc. Solid insulating media such as synthetic resins with excellent electrical insulation instead of insulation using existing insulating gases. Compact, stable and reliable switchgear using.

On the other hand, the transformer transformer current transformer, also known as MOF is a power device that transforms the ultra-high (pre) voltage to a 220 volt level that can measure the power by using a common wattmeter, and provides a current meter to the wattmeter. Therefore, the MOF is composed of a primary inlet terminal section for inputting power of an ultra-high voltage line, a transformer, a current transformer, and a secondary output terminal section for outputting downed voltage and current signals to the outside as main components.

An example of the prior art for such a MOF is described with reference to FIG.

Since the current flowing through the line of the power system is three-phase alternating current, as shown in FIG. 1, three MOFs according to the prior art are provided corresponding to each of the three phases. Each phase MOF 10 according to the prior art is provided with a primary terminal 1 for power input and an electric power meter that is exposed to the outside and is provided below the MOF 10 and does not show voltage of the phase power. Instrument transformer (2) provided by stepping down to 220 volts, for example, in accordance with the rated voltage, and an instrument current transformer (not shown in the figure or MOF 10) that provides a signal of proportional current corresponding to the current of the phase power. And a secondary terminal box (3) for providing output means for providing output signals of the respective phase transformers (2) and the current transformers of the meter to a power meter (not shown); And a substrate 4 for supporting 10.

The MOF according to the prior art configured as described above corresponds to a rated voltage of a watt-hour meter in the figure, which is connected to the output of the phase MOF 10 with respect to the phase power input to the primary terminal 1. The voltage is reduced by the instrument transformer 2 at a voltage of 220 volts and is converted into a signal of proportional current by an instrument current transformer (not shown), which is provided to an electric power meter of a city connected to the secondary terminal box 3. do. Then, the power meter calculates the amount of power used for the phase power based on the signal of the voltage and current provided from the secondary terminal box 3 of the phase MOF 10.

The MOF according to the related art configured and acting as described above has a structure in which the primary terminal 1 and the instrument transformer 2 are exposed to the outside, and cannot be used in connection with a solid insulation switchgear adopting solid insulation. There is a structural problem.

In addition, since the MOF according to the prior art has a structure in which the primary terminal 1 faces upward and a vertical power cable must be connected vertically, the vertical length of the solid insulated switchgear connecting and installing the MOF is increased. there is a problem.

Accordingly, the present invention solves the problems of the prior art, one object of the present invention can be electrically insulated so that the primary terminal 1 is not exposed to the outside, the instrument transformer and current transformer is exposed to the outside In order to provide a MOF suitable for connection to a solid insulated switchgear, it is built in the MOF body.

Another object of the present invention is to provide a MOF capable of reducing the vertical length of a solid insulation switchgear having a structure for horizontally connecting the incoming phase power cable (cable).

One object of the present invention, in the transformer transformer current transformer,

An enclosure consisting of mold water having electrical insulation;

An interface unit for introducing external power in a state in which the electronic device is embedded in the enclosure and electrically insulated;

An instrument transformer, which is embedded in the enclosure and steps down the voltage of the external power introduced into the inlet interface unit to provide as a measurement voltage;

An instrument current transformer embedded in the enclosure for providing an output of a measurement current signal proportional to a current of external power drawn into the inlet interface unit; And

By providing a transformer transformer current transformer according to the invention characterized in that it comprises a secondary terminal electrically connected to the instrument transformer and the instrument current transformer, and outputs the measurement voltage and the measurement current signal. Can be achieved.

Another object of the present invention is a transformer transformer current transformer configured as described above, wherein the inlet interface unit includes a primary terminal connected in a horizontal direction to a wire for supplying the external power. By providing a transformer transformer according to the present invention.

The transformer transformer current transformer according to the present invention has a configuration that draws external power in a state in which the inlet interface is embedded in the enclosure and electrically insulated, and thus suitable for connection to a solid insulated switchgear employing a solid insulation method. It is effective to obtain a transformer transformer.

Instrument transformer current transformer according to the present invention has a configuration that the instrument transformer and the instrument current transformer is embedded in the enclosure, to obtain a transformer transformer current transformer suitable for use in connection with a solid insulated switchgear adopting a solid insulation method It can be effective.

The transformer current transformer for instrument according to the present invention includes a primary terminal connected in a horizontal direction with the means for supplying the external power with the inlet interface, it is possible to obtain the effect of reducing the vertical length of the solid-state insulation switchgear have.

The transformer current transformer for instrument according to the present invention includes an electric conductor portion embedded in an electric solid insulator, the electric conductor portion being electrically connected between the wire for supplying the external power and the inlet interface portion, and the wire for supplying the external power. Since it further includes a solid insulated connector for electrically connecting the inlet interface unit, it is possible to reliably solidify the insulation between the external power supply wire and the inlet interface unit.

Transformer transformer current transformer according to the present invention, the solid insulated connector,

A wire connector for connecting the wire for supplying the external power; And

And a lead connector connected between the wire connector and the lead interface portion to electrically connect the wire connector and the lead interface portion, so that solid insulation can be reliably solidified between the wire for the external power supply and the lead interface portion. You can get the effect.

In the transformer current transformer for instrument according to the invention, the wire connector is,

An embedded conductor having a socket-type conductor connecting portion for inserting and connecting said electric wire, and a plug conductor portion extending from said socket-type conductor connecting portion and electrically connected to said lead-in connector; And an external insulator formed of a solid insulator in which the embedded conductor is embedded, so that the electric wire is drawn into the socket-type conductor connecting part to be electrically connected, and the plug conductor part can be connected to the inlet connector and exposed to the outside. Without this, the electrical connection can be made inside the electrical insulation material, thereby obtaining an excellent electrical insulation effect.

The transformer transformer current transformer according to the present invention further comprises an insulated ring installed between at least one of the wire connector and the inlet connector and between the inlet connector and the inlet interface and having an electrical insulation. Therefore, at least one of the wire connector and the pull-in connector and between the pull-in connector and the pull-out interface part can be connected to be completely electrically insulated from the outside.

The transformer transformer current transformer according to the present invention is electrically connected to the inlet interface unit, and further includes a drawout interface unit for drawing out the external power drawn from the primary terminal, so that the external power is solid through the drawout interface unit. The effect of being connected to and supplied from the insulated switchgear can be obtained.

In the transformer transformer current transformer according to the invention,

The drawing interface section is composed of at least three for drawing power of three phases, and each drawing interface section includes an outer insulating section formed of a solid insulating material and a conductor section embedded in the outer insulation section. At the same time as the supply, it is possible to obtain the effect of being electrically insulated from the outside through the external insulation.

The transformer transformer current transformer according to the present invention is installed to be sandwiched between the three-phase power take-off terminal and the enclosure, and further comprises an insulated ring having electrical insulation. The effect which can reliably and electrically insulate between the said enclosures of a transformer transformer current transformer for an instrument can be acquired.

In the transformer transformer current transformer according to the present invention, since the insulating ring is made of a silicon (silicon) material or made of a silicon coated ring, the production of an insulating ring is easy, the production cost is low, and excellent electrical insulation effect is obtained It can be effective.

The transformer current transformer assembly for an instrument according to the present invention includes an enclosure made of a mold having electrical insulation, an inlet interface unit for introducing external power in a state in which the enclosure is electrically insulated from the enclosure, and embedded in the enclosure. An instrument transformer for stepping down the voltage of the external power introduced into the interface unit and providing it as a measurement voltage, and an instrument for providing the measurement current signal proportional to the current of the external power embedded in the enclosure and introduced into the inlet interface unit as an output. A transformer current transformer main body electrically connected to the current transformer and the instrument transformer and the instrument current transformer, the secondary transformer outputting the measurement voltage and the measurement current signal; And an electrical conductor portion embedded in an electrical solid insulator, wherein the electrical conductor portion is electrically connected between the wire for supplying the external power and the inlet interface portion, to electrically connect the wire for supplying the external power and the inlet interface portion. Since it comprises a solid insulated connector, the inlet interface part of the transformer transformer current transformer body can be electrically solid insulated, the instrument transformer and the instrument current transformer can be electrically solid insulated, the transformer transformer current transformer body and external power It is possible to obtain an effect that can be connected between the wires supplying the reliably electrically insulated.

In the transformer current transformer assembly for instrument according to the present invention, the conductor portion of the lead-in connector constituting the solid insulated connector, the socket-type conductor portion is inserted and electrically connected to the conductor portion of the wire connector; And a plug conductor part inserted into the inlet interface part of the transformer transformer current transformer body and electrically connected to the inlet interface part. Electrical connection with the connector and the inlet interface part is made inside, and the outside is electrically insulated by a solid insulating material to obtain excellent electrical insulation effect.

The object of the present invention and the constitution and effects of the present invention to achieve the same will be more clearly understood by the following detailed description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Figure 2 is an external perspective view showing the appearance of the MOF according to the present invention, Figure 3 is a configuration embodiment of the present invention in which a solid insulated connector for connecting an electric power supply wire to the MOF main body according to the present invention 4 is a longitudinal cross-sectional view of the configuration of the present invention of Figure 3, Figure 5 is a perspective view showing the appearance of the insulating ring shown in Figure 4, Figure 6 is a view of the MOF body according to the present invention Figure 7 is a longitudinal cross-sectional view showing the internal configuration, Figure 7 is a perspective view of the use state showing a state in which the MOF according to the present invention is installed in the enclosure of the solid state switchgear.

First, as can refer to Figure 2, the transformer transformer current transformer according to the present invention is largely divided to include a MOF main body (transform transformer current transformer body) 20 and the secondary terminal 23. 2, in the transformer transformer current transformer according to the present invention, the MOF main body 20 includes an enclosure 20a and an inlet interface 21. In FIG. 2, the code | symbol 24 is a board | substrate for supporting the MOF main body 20 and the secondary terminal 23. As shown in FIG.

Enclosure 20a may be constructed by casting a mold material having electrical insulation, such as an epoxy resin material.

The lead interface unit 21 is connected to the wire connector 28 and the lead connector 27 of FIGS. 3 and 4, that is, means for drawing external power in a state in which the lead interface unit 21 is embedded in the enclosure 20a and electrically insulated. It is a means for receiving supply. As shown in FIG. 4, the lead-in interface unit 21 is composed of an electrical conductor and has a socket-shaped outer terminal 21a for electrical connection with the lead-in connector 27, an epoxy resin, Consists of the same solid insulating material, and insulates the periphery of the primary terminal 21a and includes an insulating connecting portion 21b positioned to face the lead connector 27.

The wire connector 28 and the lead connector 27 are not shown wires (not shown in FIGS. 3, 4 and 7) for supplying external power in a solid insulated switchgear enclosure (see symbol 100 in FIG. 7). C).

Instrument transformer current transformer according to the present invention further comprises an instrument transformer 26 and the instrument current transformer 25 as can refer to FIG.

The instrument transformer 26 is a means for stepping down the voltage of external power embedded in the enclosure 20a and introduced into the inlet interface unit 21 and providing it as a measurement voltage. Instrument transformer 26 may consist of, for example, a potential transformer (commonly referred to as PT) and is embedded in enclosure 20a and positioned within enclosure 20a when casting enclosure 20a in a mold. May be fixed and electrically insulated from the outside of the enclosure 20a.

The instrument current transformer 25 is embedded in the enclosure 20a and provides as an output a current signal for measurement proportional to the current of external power drawn into the inlet interface unit 21. Instrument current transformer 25 is, for example, a core and a secondary output coil wound around the core and providing an output signal according to the amount of current flowing through the current measuring object passing through the core. It may be configured as a current transformer (Current Transformer) including a. Current transformer, in the present invention, the instrument current transformer 25 provides a voltage signal that is proportional as an output signal that is proportional to the amount of current flowing through the current measurement target, and the voltage signal according to the detected amount of current is connected to the secondary terminal 23. For example, in an electronic watt-hour meter (not shown) connected through a signal line, a microprocessor may convert the current value to a current value based on, for example, table information about a current amount of a voltage signal.

The secondary terminal 23 is electrically connected to the instrument transformer 26 and the instrument current transformer 25 via, for example, a signal line, and outputs the measurement voltage and the measurement current signal. That is, the secondary terminal 23 receives the measurement voltage and the measurement current signal from the instrument transformer 26 and the instrument current transformer 25 to an electronic wattmeter of a figure, which is connected through, for example, a signal line as described above. I can deliver it.

4 and 6, the inlet interface unit 21 includes a primary terminal 21a connected in a horizontal direction with the means for supplying the external power.

3 and 4, the means for supplying external power is composed of solid insulated connectors 27 and 28. The solid insulated connectors 27 and 28 are constituted by embedding an electrical conductor in an electrical solid insulator. The solid insulated connectors 27 and 28 are electrically connected between the wire C for supplying the external power and the inlet interface unit 21, and the wire C for supplying external power and the inlet interface unit. (21) is electrically connected.

3 and 4, the solid insulated connectors 27 and 28 include a wire connector 28 and a lead connector 27.

The electric wire connector 28 is a means for connecting the electric wire C which supplies external electric power. As can refer to FIG. 4, the electric wire connector 28 includes the embedding conductor 28a which has the socket-type conductor connection part 28a1 for inserting and connecting the electric wire C. As shown in FIG.

As described in more detail with reference to FIG. 4, the wire connector 28 includes a buried conductor 28a and an external insulation portion 28b.

The buried conductor 28a extends from the socket-type conductor connecting portion 28a1 and the socket-type conductor connecting portion 28a1 for inserting and connecting the electric wire C, and is electrically connected to the inlet connector 27. It has a plug conductor portion 28a2.

The outer insulation portion 28b is formed by casting a solid insulation material such as an epoxy resin, for example, and the embedding conductor 28a is embedded therein. The outer insulation portion 28b is preferably formed with an uneven portion to increase the creepage (surface) insulation distance, and in particular, the end surface of the right side facing the lead connector 27 in FIG. 4 has an uneven portion.

The socket type conductor connecting portion 28a1 is a conductor portion extending in the vertical direction so that the electric wire C for drawing external electric power can be connected in the vertical direction and has a vertical connecting position. In addition, the socket-type conductor connecting portion 28a1 has an internal shape corresponding to the shape of the terminal portion of the electric wire C, and this internal shape has a surface of concavities and convexities so that easy detachment after the incoming connection of the electric wire C is prevented. The plug conductor portion 28a2 extends from the socket-type conductor connecting portion 28a1 at an expected right angle and extends horizontally, and has a plug shape to be inserted into and connected to the inlet connector 27. It is composed.

In FIG. 4, the lead connector 27 is connected between the wire connector 28 and the lead interface portion 21 to electrically connect the wire connector 28 and the lead interface portion 21. As shown in FIG. 4, the lead-in connector 27 includes a conductor portion 27a and an external insulation portion 27b formed of a solid insulation material into which the conductor portion 27a is embedded. The outer insulation portion 27b is formed by casting a solid insulation material such as an epoxy resin, for example, and the conductor portion 27a is embedded therein. The outer insulation portion 27b is preferably formed with an uneven portion in order to increase the creepage (surface) insulation distance, in particular, facing the MOF main body 20 and the end surface of the left side in contact with the wire connector 28 in FIG. The end surface is formed to have an uneven portion.

The conductor portion 27a of the lead-in connector 27 includes a socket-type conductor portion 27a1 and a plug (PLUG) conductor portion 27a2.

The socket-shaped conductor part 27a1 is electrically connected by inserting the conductor part of the electric wire connector 28, ie, the plug conductor part 28a2.

The plug conductor portion 27a2 is inserted into the lead interface portion 21 of the MOF body 20 and electrically connected to the lead interface portion 21.

4, the insulating rings SD2 and SD1 having electrical insulation are provided between the wire connector 28 and the lead connector 27, and the lead connector 27 and the lead interface unit 21. It is installed to fit in.

The insulating rings SD2 and SD1 may be made of a silicon material or coated with silicon, as shown in FIG. 5, and the surface is formed of an uneven surface to increase the creepage (surface) insulation distance. .

The transformer current transformer for the instrument according to the present invention is electrically connected to the inlet interface unit 21 as shown in FIG. 4, and the outlet interface unit 22 for drawing out external power drawn from the inlet interface unit 21. ) Is further included. In FIG. 4, the electrical connection of the lead-out interface part 21 and the lead-out interface part 22 is an internal connection conductor (IC) consisting of a member such as a conductor bus bar of electrical conductors connected between them. Is done by.

The drawing interface section 22 is composed of at least three for drawing power of three phases, and each drawing interface section 22 is embedded in the outer insulating section 22b and the outer insulating section 22b formed of a solid insulating material. It comprises a 22a. Also, as shown in FIG. 4, the conductor portion 22a of each lead interface portion 22 may be composed of two conductor portions, that is, a socket-type conductor portion and a plug-type conductor portion.

According to an embodiment, the lead-out interface unit 22 may include a spiral connection unit for spiral connection with the enclosure 20a of the MOF main body 20.

Preferably, the insulating ring SD3 may be installed to be sandwiched between the lead interface unit 22 and the enclosure 20a. The insulating ring SD3 may also be made of a silicon material or a silicon-coated ring, as shown in FIG. 5, and the surface is formed of an uneven surface to increase the creepage (surface) insulation distance. do.

On the other hand, as shown in FIG. 7, which is a use state perspective view showing a state in which a MOF according to the present invention is installed in an enclosure of a solid insulated switchgear, the transformer current transformer according to the present invention is connected in the solid insulated switchgear enclosure 100. Can be installed. In Figure 7, the transformer current transformer for instrument according to the present invention, the MOF main body 20, the wire connector 28 connected in a vertical direction with the wire (C), between the MOF body 20 and the wire connector 28 It comprises a lead connector 27 connected to the horizontal direction. For a more detailed configuration and operation of the solid state insulated switchgear connected to the MOF according to the present invention, the applicant of the present invention filed on May 11, 2006 and registered on August 23, 2007, Patent Registration No. 10-0723561 In addition, the name of the invention "solid-insulated disconnector and a solid-insulated switchgear using the same" can be referred to, detailed description and illustration will be omitted.

On the other hand, the operational effects of the transformer transformer current transformer according to the present invention configured as described above are as follows.

First, the transformer current transformer operation according to the present invention will be described.

The external electric power supplied through the electric wire C is connected to the electric conductor C of the lead-in connector 27 through the socket-type conductor connection part 28a1 and the plug conductor part 28a2 of the electric wire connector 28 connected to the electric wire C. It is transmitted to the primary terminal 21a of the inlet interface part 21 of the MOF main body 20 via 27a.

Since the primary terminal 21a is electrically connected to the lead-out interface unit 22 by the internal connection conductor IC, the external power supplied through the wire C is transferred to the MOF main body (through the lead-out interface unit 22). 20) Other functional parts of the external solid state isolated switchgear, such as a main panel part, a feeder panel part, etc., may be connected and transmitted.

The instrument current transformer 25 installed around the internal connecting conductor IC through which the internal connecting conductor IC penetrates is a low current corresponding current signal which is proportional to the current value of the external power supplied through the wire C. The current signal converted and provided to the secondary terminal 23 and then drawn out from the secondary terminal 23 may be metered by a power meter not shown.

The instrument transformer 26 connected to the internal connection conductor IC steps down the voltage of the external power supplied through the wire C to a voltage having a low value which is proportional to the secondary terminal 23, and then 2 The voltage drawn out from the difference terminal 23 can be metered by a power meter not shown.

At this time, the transformer transformer current transformer according to the present invention has a complete solid insulation structure in accordance with the solid-state insulation switchgear to be connected and used together. That is, the wire connector 28 connected to the electric wire C has a solid insulation structure, and the lead connector 27 which connects the electric wire connector 28 and the MOF main body 20 also has a solid insulation structure. Moreover, the connection between the electric wire C and the electric wire connector 28, the connection between the electric wire connector 28 and the lead-in connector 27, and the primary terminal 21a of the MOF main body 20 and the simple terminal 21a socket And a plug connection structure and can be electrically connected in a solid insulation without external exposure of the connection portion.

In addition, the transformer transformer current transformer according to the present invention can obtain the effect of solid insulation because both the transformer current transformer and the instrument transformer is embedded in the enclosure (20a) is formed of a solid insulating material.

The transformer current transformer for instrument according to the present invention includes a primary terminal connected in a horizontal direction with the means for supplying the external power with the inlet interface, it is possible to obtain the effect of reducing the vertical length of the solid-state insulation switchgear have.

1 is a perspective perspective view showing a MOF according to the prior art,

2 is a perspective view showing the appearance of the MOF according to the present invention,

3 is a perspective view showing an embodiment of the present invention in which a solid insulated connector for connecting an electric power supply wire is connected to the MOF main body according to the present invention;

4 is a longitudinal cross-sectional view of a configuration embodiment of the present invention of FIG.

5 is a perspective view showing the appearance of the insulated ring shown in FIG. 4,

Figure 6 is a longitudinal sectional view showing the internal configuration of the MOF body according to the present invention,

Figure 7 is a perspective view of the use state showing a state in which the MOF according to the invention installed in the enclosure of the solid state insulating switchgear.

* Explanation of symbols on the main parts of the drawings

1: Primary terminal 2: Instrument transformer

3: secondary terminal box 4: board

10: MOF 20: MOF main body

20a: enclosure

21: Inlet interface section 21a: Primary terminal

21b: insulated connection

22: withdrawal interface portion 22a: conductor portion

22b: external insulation

23: secondary terminal 24: substrate

25: current transformer 26: instrument transformer

27: incoming splice 27a: conductor portion

27a1: socket-type conductor part 27a2: plug conductor part

27b: external insulation

28: electric wire connector 28a: embedded conductor

28a1: Socket type conductor connection part

28a2: PLUG conductor section

28b: external insulation

100: solid insulated switchgear enclosure

C: wire IC: internal connection conductor

SD1, SD2: SD3: Insulation Ring

Claims (14)

In the transformer transformer current transformer, An enclosure composed of mold water having electrical insulation; An interface unit for introducing external power in a state in which the electronic device is embedded in the enclosure and electrically insulated; An instrument transformer, which is embedded in the enclosure and steps down the voltage of the external power introduced into the inlet interface unit to provide as a measurement voltage; An instrument current transformer embedded in the enclosure for providing an output of a measurement current signal proportional to a current of external power drawn into the inlet interface unit; A secondary terminal electrically connected to the instrument transformer and the instrument current transformer and outputting the measurement voltage and the measurement current signal; And An electrical conductor addition is embedded in an electrical solid insulator and the electrical conductor portion is electrically connected between the wire for supplying the external power and the inlet interface portion, and the solid insulation for electrically connecting the wire for supplying the external power and the inlet interface portion. Including; The solid insulation connector, A wire connector for connecting the wire for supplying the external power; And An inlet connector which is connected between the wire connector and the inlet interface unit to electrically connect the wire connector and the inlet interface unit Transformer transformer current transformer, characterized in that comprising a. The method of claim 1, And the inlet interface unit includes a primary terminal connected in a horizontal direction with the means for supplying the external power. delete delete The method of claim 1, The wire connector is, A transformer transformer current transformer comprising a buried conductor having a socket-shaped conductor connecting portion for inserting and connecting the electric wire. The method of claim 1, The transformer transformer current transformer of claim 1, further comprising an insulated ring installed between at least one of the wire connector and the inlet connector and between the inlet connector and the inlet interface and having an electrically insulating property. The method of claim 1, And a drawing interface section electrically connected to the drawing interface section, for drawing out external power drawn from the drawing interface section. The method of claim 7, wherein The drawing interface section is composed of at least three for drawing the power of the three phase, each drawout interface section comprises a transformer insulating transformer comprising an outer insulating portion formed of a solid insulating material and a conductor portion embedded in the outer insulating portion . The method of claim 7, wherein The transformer transformer current transformer of claim 1, further comprising an insulated ring installed between the lead interface unit and the enclosure and having an electrically insulating property. The method of claim 6 or 9, The insulated ring is a transformer transformer current transformer, characterized in that consisting of a ring made of silicon (silicon) material or coated with silicon. An enclosure composed of a mold material having electrical insulation, a drawing interface section for drawing external power in a state of being electrically insulated from the enclosure, and a voltage of external power buried in the enclosure and drawn into the drawing interface section Instrument transformer for providing as a voltage for measurement, Instrument current transformer for providing a measurement current signal proportional to the current of external power embedded in the enclosure and drawn into the inlet interface unit, and the instrument transformer and the instrument A transformer transformer current transformer body electrically connected to the current transformer, the transformer current transformer main body including a secondary terminal for outputting the measurement voltage and the measurement current signal; And An electrical conductor addition is embedded in an electrical solid insulator and the electrical conductor portion is electrically connected between the wire for supplying the external power and the inlet interface portion, and the solid insulation for electrically connecting the wire for supplying the external power and the inlet interface portion. Contains the visitor, The solid insulation connector, A wire connector for connecting the wire for supplying the external power; And A lead connector connected between the wire connector and the lead interface portion to electrically connect the wire connector and the lead interface portion; Transformer transformer current transformer assembly characterized in that configured by. delete The method of claim 11, The wire connector is, An embedded conductor having a socket-type conductor connecting portion for inserting and connecting said electric wire, and a plug conductor portion extending from said socket-type conductor connecting portion and electrically connected to said lead-in connector; And The transformer transformer current transformer assembly of claim 1, wherein the buried conductor includes an outer insulating portion formed of a solid insulating material. The method of claim 11, The incoming connector is, An outer insulation portion formed of a conductor portion and a solid insulation material in which the conductor portion is embedded; Conductor part of incoming connector, A socket-type conductor portion to which the conductor portion of the wire connector is inserted and electrically connected; And a plug conductor portion inserted into the inlet interface portion of the instrument transformer current transformer body and electrically connected to the inlet interface portion.

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