CN201113373Y - 110kV-220kV XLPE cable oil-filled outdoor terminal - Google Patents

Abstract

The utility model discloses an oil-filled outdoor terminal for 110kV-220kV cross-linked cables. Pads, tailpipes, and insulating oil, characterized in that the insulating oil in the bushing is passed through one end to hold the cable body tightly with an oil sealing ferrule, and the lower flange uses bolts to compress the plane of the oil sealing ferrule to prevent the insulating oil from leaking out. , The utility model can make the electric field distribution at the cutting part of the cable insulation shield more uniform, and the electrical performance of the cable terminal is stable. It has passed the requirements of the national standard and the International Electrotechnical Commission standard, and the oil sealing structure of the cable terminal is optimized to make the structure simpler and more reasonable.

Description

110kV-220kV XLPE cable oil-filled outdoor terminal

Technical field:

The utility model refers to an outdoor terminal of a high-voltage cross-linked polyethylene power cable, which is suitable for 110kV-220kV cross-linked cables.

Background technique:

Cross-linked cable terminals are widely used in urban networks. Since the electric field at the cutting point of the cable insulation shield is very concentrated, cables with a voltage level of 6kV and above are used in the use of a stress cone with a horn tube shape made of semi-conductive materials. To improve the electric field distribution here, refer to the Chinese patent No. 02261002.2. At present, most of the high-voltage cable terminals used are installed with a stress cone, and the bottom is wound with an insulating tape or an "O" sealing ring is used to prevent the leakage of insulating oil. However, this structure requires that the material of the stress cone must be compatible with the insulating oil, and special attention should be paid to the sealing of the insulating oil, otherwise oil leakage will occur.

Invention content:

The purpose of this utility model is to overcome the deficiencies of the prior art, and to design a cross-linked cable oil-filled outdoor terminal suitable for voltage levels of 110kV-220kV.

The technical scheme of the utility model is a 110kV-220kV cross-linked cable oil-filled outdoor terminal, which consists of a stress cone 1, an epoxy silicon rubber bushing (or porcelain bushing) 2, bushing upper and lower flanges 3, pressure Disc 4, oil seal ferrule 5, ferrule pad 6, tail pipe 7, insulating oil 8, characterized in that: the oil seal ferrule 5 is used to hold the insulating oil 8 in the casing tightly to the cable body through one end, and the blue 3 Use bolts to compress the oil seal ring 5 planes to prevent oil leakage outside the insulating oil.

One end of the oil sealing ferrule 5 is conical or tube-shaped, forming a seal with the insulation shielding sleeve of the cable body; the other end is in the shape of a flat flange, which is compressed and sealed by the lower flange 3 of the cable terminal and the pressure plate 4 .

Described stress cone 1 adopts solid silicon rubber to pass two or more injection molding parts with a certain geometric combination shape, wherein the inner surface of the trumpet-shaped part made of semiconductor material is composed of three line segments, a straight line, two segment curve.

Due to the use of a new sealing ring to prevent oil leakage, the installation is easier, easy to grasp, and the seal is more reliable; solid silicone rubber is used in the cable stress cone through a certain geometric shape and multiple injection molding, which can provide greater gripping force , so that the safety margin of the terminal stress cone is greatly improved.

Description of drawings:

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Fig. 1 is a cross-sectional view of an oil-filled outdoor terminal of a 110kV cross-linked cable according to an embodiment of the utility model;

Fig. 2 is a cross-sectional view of an oil-filled outdoor terminal of a 220kV cross-linked cable according to an embodiment of the utility model;

Fig. 3.1 The sectional view of the oil sealing ferrule 5 of the utility model;

Figure 3.2 The top view of the oil seal ring 5 of the utility model;

Fig. 4 is a cross-sectional view of the stress cone 1 of the oil-filled outdoor terminal of the 110kV cross-linked cable according to the embodiment of the utility model;

Fig. 5 is a sectional view of the stress cone 1 of the oil-filled outdoor terminal of the 220kV cross-linked cable according to the embodiment of the utility model.

In the figure: 1 stress cone, 2 epoxy silicone rubber bushing (or porcelain bushing), 3 upper and lower flanges of bushing, 4 pressure plate, 5 oil seal ferrule, 6 ferrule pad, 7 tail pipe, 8 insulating oil .

Detailed ways:

The oil leakage prevention of the cable outdoor terminal is an important part. The prevention of insulating oil leakage at cable terminals is one of the key principles of terminal design, and the key technology to ensure this is oil sealing measures, that is, one end is a conical or tubular oil sealing ferrule, which forms a seal with the cable body insulation shield; One end is in the shape of a flat flange, which is compressed and sealed by the lower flange of the cable terminal and the pressure plate. For accessories whose operation quality has been guaranteed for more than 20 years, safe operation cannot be guaranteed if the insulating oil leaks.

Stress cone forming of solid silicone rubber has always been a difficult problem in the cable accessories industry. Due to the problem of solid fluidity, in the stress cone structure with straight line and arc tangent, it is difficult for solid silicone rubber to flow into the narrow area near the tangent point. We pass The special process and the design of the mold and the structural shape have completed the manufacture of the solid silicone rubber stress cone.

In order to ensure that the cable terminal does not leak oil during 20 years of operation, we have adopted a subordinate solution (see Figure 2): In addition to installing conventional components inside the cable terminal, a unique sealing ring 5 is specially designed for its anti-leakage. The upper end with a cone is used to form a seal with the cable insulation shield; it has a flange shape. The seal is formed by the compression of the lower flange 3 and the pressure gain 4 of the cable terminal. At the same time, in order to adapt to various cable cross-sections, the diameter of the hole where the cable passes through the middle of the compression disc is larger than the known maximum diameter of the cable. By matching sleeves with different inner diameters Ring gasket 6 to prevent oil pressure from damaging the middle section of the sealing ring. In Figure 2, the stress cone 1 inside the cable terminal is made of conductive and insulating materials. The inner surface of the bell mouth shape made of conductive materials is connected by multiple curves. The integrity of the curves and maintaining the design shape directly affect the safe operation. In order to ensure that the curve is not deformed during production, special structural shapes and multiple injection methods must be used to obtain ideal finished products.

Claims (3)

1. oil-filled outdoor terminal of 110Kv-220kV crosslinked cable, its composition comprises lower flange (3), platen (4), oil seal lasso (5), lasso pad (6), tail pipe (7), insulating oil (8) on stress cone (1), epoxy-silicone rubber sleeve pipe or porcelain bushing (2), the sleeve pipe, it is characterized in that: hold the insulating oil in the sleeve pipe (8) tightly cable body by an end with oil seal lasso (5), and lower flange (3) uses bolt to compress oil seal lasso (5) plane to prevent the insulating oil leakage of oil that leaks.

2. the oil-filled outdoor terminal of 110Kv-220kV crosslinked cable according to claim 1 is characterized in that: described oil seal lasso (5) one ends are that taper or cast and this insulation shielding of cable form sealing to cover; The other end is the face-flange shape, by cable termination lower flange (3) and platen (4) it is compressed sealing.

3. the oil-filled outdoor terminal of 110Kv-220kV crosslinked cable according to claim 1 and 2, it is characterized in that: described stress cone (1) adopts firm silicone rubber to have the parts of certain geometry in conjunction with shape by twice or multiple injection moulding, wherein form by three line segments with the inner surface of the tubaeform member of semi-conducting material manufacturing, one section straight line, two sections curves.

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