CN219626373U

CN219626373U - Medium-voltage water-blocking power cable convenient for verifying integrity

Info

Publication number: CN219626373U
Application number: CN202223402998.7U
Authority: CN
Inventors: 沈琴妹; 周彩霞; 陈科达; 蒋阿良
Original assignee: Jiangsu Weida Cable Co ltd
Current assignee: Jiangsu Weida Cable Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-09-01
Anticipated expiration: 2032-12-19

Abstract

The utility model belongs to the technical field of power cable application, and particularly discloses a medium-voltage water-blocking power cable convenient for integrity verification, which comprises a conductor, a conductor shield, XLPE insulation, an insulation shield, a metal shield, a water-blocking layer, a semi-conductive layer and an outer protective layer; the conductor, the conductor shield, the XLPE insulation, the insulation shield, the metal shield, the water-resistant layer, the semiconductive layer and the outer protective layer are coaxially arranged in sequence from inside to outside. The utility model has the beneficial effects that: 1. the semiconductive layer structure has no influence on the cost of the whole cable basically, can be convenient for a user to check the water resistance of the water resistance layer structure, ensures the safe operation of the cable, and can also take measures in advance when the electrical performance of the water resistance layer structure is reduced; 2. the waterproof device not only can meet the waterproof requirement, but also can meet the requirement of checking the integrity of a waterproof layer in the construction and operation processes of the cable, can be replaced or treated in time when the performance is reduced, and can verify that the pressure-resistant test is convenient to operate; 3. the whole design is convenient to manufacture, practical and beneficial to popularization.

Description

Medium-voltage water-blocking power cable convenient for verifying integrity

Technical Field

The utility model belongs to the technical field of power cable application, and particularly relates to a medium-voltage water-blocking power cable convenient for integrity verification.

Background

The power cable is a cable for transmitting and distributing electric energy, and is commonly used for urban underground power grids, power station outgoing lines, power supply in industrial and mining enterprises and power transmission lines under sea water passing through the river.

The voltage class can be divided into medium-voltage and low-voltage power cables (35 kv and below), high-voltage power cables (110 kv and above), ultra-high-voltage power cables (275-800 kv) and ultra-high-voltage power cables (1000 kv and above). In addition, it is also possible to divide the current system into ac and dc cables.

At present, medium-voltage water-blocking power cables are widely used in various occasions requiring water blocking, and a general water-blocking structure is arranged inside the cable, so that the integrity and performance degradation in the operation process of the cable cannot be verified, the influence of the water-blocking performance degradation on the cable cannot be effectively tracked, and finally the cable fails in the operation process.

Accordingly, based on the above-described problems, the present utility model provides a medium voltage water blocking power cable that facilitates verification of integrity.

Disclosure of Invention

The utility model aims to: the utility model aims to provide a medium-voltage water-blocking power cable convenient for verifying integrity, which solves the problem that the medium-voltage water-blocking power cable in the prior art is inconvenient to verify.

The technical scheme is as follows: the utility model provides a medium-voltage water-blocking power cable convenient for integrity verification, which comprises a conductor, a conductor shield, XLPE insulation, an insulation shield, a metal shield, a water-blocking layer, a semiconductive layer and an outer protective layer; the conductor, the conductor shield, the XLPE insulation, the insulation shield, the metal shield, the water-resistant layer, the semiconductive layer and the outer protective layer are sequentially arranged from inside to outside; the conductor, the conductor shield, the XLPE insulation, the insulation shield, the metal shield, the water-resistant layer, the semiconductive layer and the outer protective layer are coaxially arranged in sequence from inside to outside.

According to the technical scheme, the water-blocking layer consists of a water-blocking belt and LLDPE polyethylene.

According to the technical scheme, the semiconductive layer consists of a semiconductive graphite coating; wherein, can constitute two electrodes when testing with the metal shielding, carry out direct current 15kV/1min withstand voltage test to the water blocking layer.

According to the technical scheme, the semiconductive layer is coated on the surface of the water-resistant layer during processing of the water-resistant layer, and the semiconductive layer is protected after the outer protective layer is processed.

Compared with the prior art, the medium-voltage water-blocking power cable convenient for verifying the integrity has the beneficial effects that: 1. the semiconductive layer structure has no influence on the cost of the whole cable basically, can be convenient for a user to check the water resistance of the water resistance layer structure, ensures the safe operation of the cable, and can also take measures in advance when the electrical performance of the water resistance layer structure is reduced; 2. the waterproof device not only can meet the waterproof requirement, but also can meet the requirement of checking the integrity of a waterproof layer in the construction and operation processes of the cable, can be replaced or treated in time when the performance is reduced, and can verify that the pressure-resistant test is convenient to operate; 3. the whole design is convenient to manufacture, practical and beneficial to popularization.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a medium voltage water blocking power cable for facilitating integrity verification in accordance with the present utility model;

wherein, the drawing serial numbers are as follows: 1-conductor, 2-conductor shield, 3-XLPE insulation, 4-insulation shield, 5-metal shield, 6-water-resistant layer, 7-semiconductive layer, 8-outer sheath.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms of "top", "bottom", "one side", "the other side", "front", "rear", "middle portion", "inner", "top", "bottom", etc., are directions or positional relationships based on the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model is further elucidated below in connection with the drawings and the specific embodiments.

A medium voltage water blocking power cable for ease of integrity verification as shown in fig. 1, comprising a conductor 1, a conductor shield 2, XLPE insulation 3, an insulation shield 4, a metal shield 5, a water blocking layer 6, a semiconductive layer 7 and an outer jacket 8;

the conductor 1, the conductor shield 2, the XLPE insulation 3, the insulation shield 4, the metal shield 5, the water-resistant layer 6, the semiconductive layer 7 and the outer protective layer 8 are sequentially arranged from inside to outside.

The conductor 1, the conductor shield 2, the XLPE insulation 3, the insulation shield 4, the metal shield 5, the water-resistant layer 6, the semiconductive layer 7 and the outer protective layer 8 are coaxially arranged in sequence from inside to outside.

In addition, the preferred water barrier layer 6 is composed of a water barrier and LLDPE polyethylene.

In addition, the preferred semiconductive layer 7 consists of a semiconductive graphite coating; wherein, can form two electrodes when testing with metal shield 5, carry out direct current 15kV/1min withstand voltage test to water blocking layer 6.

In addition, the semiconductive layer 7 is preferably coated on the surface of the water-blocking layer 6 during processing of the water-blocking layer 6, and the outer protective layer 8 protects the semiconductive layer 7 after processing is completed.

The middle-voltage water-blocking power cable with the structure is convenient to verify the integrity and has the working principle or the structural principle that:

the conductor 1, the conductor shield 2, the XLPE insulation 3, the insulation shield 4 and the metal shield 5 have the same structure as the common medium voltage power cable, and the normal operation of the power cable is ensured.

The waterproof layer 6 is composed of a waterproof belt and LLDPE polyethylene, the LLDPE has good waterproof performance and electrical performance, the polyethylene structure with a complete structure has good waterproof performance, the waterproof performance can be guaranteed only by guaranteeing that the polyethylene structure is completed in the cable construction and operation process, and the structural integrity of the polyethylene can be checked regularly by applying a direct current 15kV/1min withstand voltage test.

The semiconductive layer 7 comprises semiconductive graphite coating, can constitute two electrodes when testing with metal shield 5, carry out direct current 15kV/1min withstand voltage test to the water blocking layer 6, guarantee the integrality of water blocking layer 6, wherein semiconductive layer 7 can not influence semiconductive performance decline with time and construction in cable structure's inside.

The semiconductive layer 7 is coated on the surface of the water-resistant layer 6 when the water-resistant layer 6 is processed, and the semiconductive layer 7 is protected after the outer protective layer 8 is processed, so that the semiconductive layer 7 is ensured to be intact in the construction and operation processes, and the periodical test of the water-resistant layer 6 is ensured to be carried out as expected.

It should be noted that in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a medium voltage power cable that blocks water convenient to verify integrality which characterized in that: the insulating cable comprises a conductor (1), a conductor shield (2), XLPE insulation (3), an insulation shield (4), a metal shield (5), a water-resistant layer (6), a semiconductive layer (7) and an outer protective layer (8);

the conductor (1), the conductor shield (2), the XLPE insulation (3), the insulation shield (4), the metal shield (5), the water-resistant layer (6), the semiconductive layer (7) and the outer protective layer (8) are sequentially arranged from inside to outside, wherein the conductor (1), the conductor shield (2), the XLPE insulation (3), the insulation shield (4), the metal shield (5), the water-resistant layer (6), the semiconductive layer (7) and the outer protective layer (8) are sequentially coaxially arranged from inside to outside;

the semi-conductive layer (7) consists of a semi-conductive graphite coating, wherein the semi-conductive layer and the metal shield (5) can form two electrodes in a test, and a direct current 15kV/1min withstand voltage test is carried out on the water-resistant layer (6);

the semiconductive layer (7) is coated on the surface of the water-resistant layer (6) when the water-resistant layer (6) is processed, and the semiconductive layer (7) is protected after the outer protective layer (8) is processed.

2. A medium voltage water blocking power cable for facilitating integrity verification as claimed in claim 1, wherein: the water blocking layer (6) consists of a water blocking belt and LLDPE polyethylene.