Grounding structure with land cable with built-in armored temperature measurement optical cable
A grounding structure and optical cable technology, which is applied to the parts, cables, and connections of the connecting device, can solve problems such as exceeding the upper limit of the safety value and potential safety hazards, so as to improve the service life, reduce heat loss, and eliminate excessively high induced potential Effect
Inactive Publication Date: 2017-02-01
宁波东方电缆股份有限公司
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Problems solved by technology
During construction, if the cable sheath adopts the grounding method protected by a voltage limiter, there must be an induced potential in the segmented sheath. If the method is used, the cable sheaths of the two segments will be connected through the steel armor of the optical cable, so the maximum induced potential will be generated at the segmented connection, and the induced potential will exceed the upper limit of the safe value, posing a great potential safety hazard
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[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0017] refer to Figure 1 to Figure 3 As shown, a grounding structure of a land cable with a built-in armored temperature measuring optical cable, one end of the single-core cable in the land cable is grounded through protective grounding, and the other end is grounded directly, and the outer layer of the single-core cable is a metal sheath 4. The metal sheath 4 is provided with a conductor 6 and a temperature-measuring optical cable 5; the single-core cable is divided into several equidistant sections by intermediate joints 1, 2, 3, and 4, and the metal sheath 4 and the temperature-measuring optical cable 5 are in the The intermediate joints 1, 2, 3, and 4 are grounded. After grounding, the induced voltage in the metal sheath 4 at the intermediate joints 1, 2, 3, and 4 is ≤65V. Specifically, a three-phase single-core cable is provid...
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The invention relates to a grounding structure with a land cable with a built-in temperature measurement optical cable. One end of a single-core cable in the land cable is protected and connected with the ground, the other end of the single-core cable is connected with the ground by a direct grounding mode, a metal sheath is arranged at an outer layer of the single-core cable, a conductor and the temperature measurement optical cable are arranged in the metal sheath, the single-core cable is partitioned to a plurality of segments with equal distance by an intermediate connector, the metal sheath and the temperature measurement optical cable are connected with the ground at the intermediate connector, and an induced voltage in the metal sheath at the intermediate connector after the metal sheath is connected with the ground is smaller than or equal to 65V. Compared with the prior art, the grounding structure has the following beneficial effects that the grounding structure of the land cable with the built-in temperature measurement optical cable is provided, an excessively high induced potential at an armored connection part of the optical cable can be eliminated by a grounding mode of arranging the temperature measurement optical cable in a segment way, and a potential risk is eliminated; and meanwhile, serious thermal loss is reduced, and the service lifetime of a cable main body is prolonged.
Description
technical field [0001] The invention belongs to the field of cables, and in particular relates to a grounding structure of a land cable with a built-in armored temperature measuring optical cable. Background technique [0002] Power cables are cables used to transmit and distribute electric energy. Power cables are often used in urban underground power grids, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. In power lines, the proportion of cables is gradually increasing. As an important cable product, power cables include 1~500KV and above various voltage levels and various insulation power cables to adapt to different use environments and needs. [0003] The land cable is a cable laid or erected on land. When the land cable operates under alternating voltage, the alternating current passing through the core will inevitably generate an alternating magnetic field. The flux...
Claims
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IPC IPC(8): H01R4/66H01R13/66H01B7/22
CPCH01R4/66H01B7/225H01R13/6691
Inventor 王方舒夏峰
Owner 宁波东方电缆股份有限公司