KR20090131386A - 3-phase batch gis spacer using optical fiber current sensor - Google Patents

Abstract

PURPOSE: A 3-phase collective type GIS(Gas Insulated Switchgear) spacer for use of an optical fiber current sensor is provided to insert a PM(Polarization Maintaining) optical fiber into a shield ring of an external case, thereby using the shield ring as an optical signal transmission path. CONSTITUTION: A GIS spacer comprises 3 current sensor shield rings(1). The 3 current sensor shield rings are disposed to measure each phase of 3 phases. Each current sensor shield ring includes rings. An optical fiber current sensor is inserted into the inside of each current sensor shield ring. In the rings, a nonmagnetic substance of an inside diameter side and a magnetic substance of an outside diameter side are coupled together. The current sensor shield rings are adjacent to each other for electric connection.

Description

3-Phase Batch GIS Spacer Using Optical Fiber Current Sensor

The present invention relates to a method for installing an optical current sensor in a spacer for a three-phase collective gas insulated switchgear (GIS). In particular, the present invention enables a compact, lightweight, and compact GIS. The present invention relates to a method of installing an optical fiber for a current sensor that completely solves an interphase interference problem during insulation and measurement and enables high-precision measurement.

In the air insulated substation or the gas insulated substation, current sensors are installed everywhere to detect the magnitude of the current, and most of the core sensors are core type current transformers (CT).

1 is a cross-sectional view of a typical three-phase collective GIS breaker for showing the iron core CT installed in the inlet. FIG. 2 is an enlarged view of the iron core CT and spacer portion of FIG. 1. FIG. As such, CT, which is currently installed and operated in a circuit breaker for three-phase collective GIS, has a large volume of structure for electrical insulation, poor measurement accuracy, and difficulty in measuring an accident current due to magnetic flux saturation of the iron core. There is this. In addition, in evaluating the power quality, the reliability of the measurement result is low due to the frequency response characteristics, and thus there is a problem that can cause a large error.

In addition, the optical sensor current measurement method, which has many advantages over the current transformer (CT) used as the current measurement method of the GIS, can be applied to power equipment in various forms. In addition, efforts have been made to use a photocurrent sensor as a spacer-mounting type. However, due to the signal transmission characteristics of the optical fiber used as the sensor, the installation type is limited, and so far, it has not been used as a spacer-mounting type at all.

Therefore, in the case of single-phase spacers, a method of installing a current sensor in the GIS enclosure is possible, so it is not necessary to consider a problem caused by the installation of the spacers. Therefore, when the optical sensor must be installed inside the spacer, it is necessary to consider the problems accordingly.

Accordingly, an object of the present invention is to provide a method for embedding a photocurrent sensor in a three-phase packaged GIS spacer in place of a conventional iron core CT in a GIS.

In addition, another object of the present invention is that the single-phase spacer can be installed in the GIS enclosure, so it is not necessary to install it inside the spacer and does not have to consider the problem caused by external interference. In the case of the type spacer, since interference occurs between phases, a method of embedding a current sensor using an optical fiber in a three-phase integrated GIS spacer to shield such phase interference and accurately measure the current flowing in each phase. have.

First, to summarize the features of the present invention, a three-phase batch type GIS spacer using an optical fiber current sensor according to an aspect of the present invention for achieving the object of the present invention, is arranged for the measurement of each phase of the three phases It includes three current sensor shield rings, each current sensor shield ring includes a ring in which the non-magnetic material on the inner diameter side and the magnetic material on the outer diameter side, it is possible to insert an optical fiber current sensor inside each of the current sensor shield rings have.

The radius of each current sensor shield ring further includes an enclosure shield ring disposed out of the current sensor shield rings, the current sensor shield rings disposed adjacent to each other and electrically connected to each other so as to meet the enclosure shield ring. Can be determined.

It may further include at least one ground ring electrically connected to the enclosure shield ring.

A polarization maintaining optical fiber for transmitting an optical signal may be inserted into the enclosure shield ring.

The optical fiber current sensor and the polarization maintaining optical fiber may be connected inside the current sensor shield ring at a portion where the current sensor shield ring and the enclosure shield ring meet.

The polarization-maintaining optical fiber connected to the optical fiber current sensor may be drawn out through the inside of the ground ring electrically connected to the enclosure shield ring for connection to an external measurement circuit.

According to the three-phase integrated GIS spacer with the optical fiber current sensor according to the present invention, it is possible to use an enclosure shield ring, which is used for conventional triple point electric field relaxation, as an optical signal transmission path by inserting a polarization maintaining optical fiber.

In addition, according to the three-phase batch GIS spacer with an optical fiber current sensor according to the present invention, the enclosure shield ring serves to protect the optical fiber from the thermal expansion characteristics of the spacer and the thermal and mechanical properties of the epoxy curing process during spacer fabrication. In addition, it is possible to minimize the change in signal transmission characteristics of the optical sensor due to external stress.

In addition, according to the present invention, according to the three-phase integrated GIS spacer in which the optical fiber current sensor is incorporated, the inside of the current sensor shield ring is formed of a nonmagnetic material and the outside of the magnetic material, thereby shielding the interference between phases and generating each phase. It is possible to accurately measure the characteristic change of the current only by the characteristic caused by the magnetic field.

In addition, according to the three-phase batch GIS spacer with a built-in optical fiber current sensor according to the present invention, the current sensor shield ring protects the optical fiber current sensor from the thermal expansion characteristics of the spacer and the thermal and mechanical properties of the epoxy curing process during spacer fabrication In addition to protecting the optical fiber sensor against external stress.

In addition, according to the present invention, according to the three-phase batch type GIS spacer with a built-in optical fiber current sensor, the current sensor shield rings to be included inside the enclosure shield ring, and the adjacent current sensor shield rings to the radius of the enclosure shield ring. By determining the size, it is possible to minimize the increase in electric field strength due to the insertion of the current sensor shield ring.

In addition, according to the present invention, according to the three-phase batch type GIS spacer with the built-in optical fiber current sensor, the electrical insulation and the inter-phase interference problem can be completely solved through the above configuration, high-precision measurement can be realized, and small and light weight can be realized. Further technological advances can be realized.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited to the embodiments. Like reference numerals in the drawings denote like elements.

3 is an overall cross-sectional view showing the arrangement of a current sensor shield ring and an enclosure shield ring of a three-phase batch type GIS spacer with an optical fiber current sensor according to an embodiment of the present invention.

Referring to FIG. 3, a three-phase packaged GIS spacer according to an embodiment of the present invention includes a current sensor shield ring 1, an enclosure shield ring 2, and a ground ring 3 inside an insulator such as epoxy. Include.

4 is a side cross-sectional view of an arrangement of the current sensor shield ring 1 and the enclosure shield ring 2 of the three-phase packaged GIS spacer with the optical fiber current sensor according to an embodiment of the present invention. 5 shows the actual production of this part.

As shown in FIG. 4, each phase ring is arranged adjacent to each other with respect to the conductor connecting portion of the lower portion of the current sensor shield ring 1 containing the optical fiber current sensor for measurement of each phase of the three phases. The inner diameter side of the sensor shield ring 1 is made of a nonmagnetic material, and the outer diameter side thereof is made of a magnetic material. Inside the current sensor shield ring 1, an optical fiber current sensor having a Faraday effect is inserted and filled in the entire ring. The interior of the enclosure shield ring 2 is filled with a polarization maintaining fiber (PM fiber).

As described above, the optical fiber current sensor is inserted into the current sensor shield ring 1 so that the optical fiber current sensor can be mechanically disconnected from the epoxy molding part of the spacer, and electrically the magnetic field is formed of a nonmagnetic material forming the inner diameter side of the current sensor shield ring 1. To prevent the shielding and leakage of the magnetic sensor forming the outer diameter side of the current sensor shield ring (1) to prevent the interference between phases can be maintained between phase independence. Accordingly, the characteristic change of the current can be accurately measured through the optical fiber current sensor only by the characteristic of the magnetic field generated in each phase. In addition, the current sensor shield ring (1) protects the optical fiber current sensor from thermal expansion and the thermal and mechanical properties of the epoxy curing process during the spacer manufacturing and also protects the optical fiber current sensor against external stress. can do.

The optical fiber current sensor inserted into the current sensor shield ring 1 has a magneto-optic effect or Faraday effect of the optical fiber, that is, a magnetic field is formed when a current flows in the surrounding conductor, and the optical fiber is formed in the magnetic field. When a Faraday element is placed, the polarized light is rotated in proportion to the strength of the magnetic field when it passes through the polarized light. The light rotated by the interfering magnetic field cannot obtain an inherent value of the image. In this way, the inter-phase interference was shielded in the same way as above to allow accurate current measurement.

In addition, by inserting a polarization-maintaining optical fiber into the enclosure shield ring (2) used for triple-point electric field relaxation can be utilized as a data transmission path. In this case, the enclosure shield ring 2 protects the polarization-maintaining optical fiber from the thermal expansion characteristics of the spacer and the thermal and mechanical properties of the epoxy curing process during the spacer manufacturing, and the signal transmission characteristic of the optical fiber current sensor is changed by external stress. Can be minimized.

On the other hand, it is preferable to determine the radius of the three current sensor shield ring (1) so that each can meet at the outer position of the enclosure shield ring (2). That is, the size, i.e., the radius of each current sensor shield ring 1 is determined so that the current sensor shield rings 1 which are disposed adjacent to each other so as to be electrically connected and have the same radius meet the enclosure shield ring 2. Accordingly, the increase in the electric field strength due to the insertion of the current sensor shield ring 1 can be minimized.

As shown in FIG. 4, the optical fiber current sensor inside the current sensor shield ring 1 and the polarization-maintaining optical fiber inside the enclosure shield ring 2 are formed inside a portion where the current sensor shield ring 1 and the enclosure shield ring 2 meet each other. The connection point does not leave the current sensor shield ring 1. That is, the optical fiber current sensor and the polarization maintaining optical fiber are connected inside the current sensor shield ring 1 at the portion where the current sensor shield ring 1 and the enclosure shield ring 2 meet.

Basically, each phase may consist of one or two or more ground rings 3, and the enclosure shield ring 2 is connected to the ground ring 3. The magnetic part at the outer diameter of the current sensor shield ring 1 of each phase is electrically connected (contacted) with the enclosure shield ring 2 so as to be connected to the ground. In the measurement, the ground ring 3 is connected to an external ground, and the polarization-maintaining optical fiber inside the enclosure shield ring 2 is drawn out to the outside through the ground ring 3 to be connected to an external measurement circuit.

Through the configuration of the three-phase batch type GIS spacer according to the present invention as described above, the electrical insulation and inter-phase interference problems can be completely solved, high precision measurement is possible, and small size and light weight can be realized.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

1 is a cross-sectional view of a typical three-phase collective GIS breaker for showing the iron core CT installed in the inlet.

FIG. 2 is an enlarged view of the iron core CT and spacer portion of FIG. 1. FIG.

3 is an overall cross-sectional view showing the arrangement of the current sensor shield ring and the enclosure shield ring of a three-phase batch type GIS spacer with an optical fiber current sensor according to an embodiment of the present invention.

4 is a side cross-sectional view of an arrangement part of a current sensor shield ring and an enclosure shield ring of a three-phase batch type GIS spacer with an optical fiber current sensor according to an embodiment of the present invention.

Figure 5 shows the actual fabrication of the part to be placed the current sensor shield ring and the enclosure shield ring of the three-phase batch GIS spacer according to an embodiment of the present invention.

6 is a cross-sectional view of the current sensor shield ring according to an embodiment of the present invention.

Claims (6)

In a three-phase package type GIS spacer using an optical fiber current sensor, Includes three current sensor shield rings arranged for measurement of each phase of three phases, Each current sensor shield ring includes a ring in which a nonmagnetic material on an inner diameter side and a magnetic material on an outer diameter side are combined, and an optical fiber current sensor is inserted into each of the current sensor shield rings. The method of claim 1, Further comprising an enclosure shield ring disposed out of the current sensor shield rings, And a radius of each of the current sensor shield rings is determined such that the current sensor shield rings disposed adjacent to each other to be electrically connected and having the same radius meet the enclosure shield ring. 3. The GIS spacer of claim 2, further comprising at least one ground ring electrically connected to the enclosure shield ring. The method of claim 2, wherein the enclosure shield ring, GIS spacer, characterized in that the polarization maintaining optical fiber is used for the optical signal transmission. The GIS spacer according to claim 4, wherein the optical fiber current sensor and the polarization maintaining optical fiber are connected inside the current sensor shield ring at a portion where the current sensor shield ring and the enclosure shield ring meet each other. 6. The method of claim 5, wherein the polarization maintaining optical fiber connected to the optical fiber current sensor is drawn to the outside through the interior of the ground ring electrically connected to the enclosure shield ring for connection to an external measurement circuit. GIS spacer.

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