Coated cable joint fault early warning device and method

A technology for cable joints and fault warning, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problems of inaccurate detection results and detection interference, etc., and achieve the goal of improving economy, simplifying workload, and reducing overload risks Effect

Inactive Publication Date: 2021-07-02
NANYANG POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER
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  • Claims
  • Application Information

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Problems solved by technology

However, the temperature measurement unit of this patent is in direct contact with the core of the cable joint, which does not belong to the high-incidence area of ​​partial discharge, and the electromagnetic signals of the surrounding and the series circuit under test will interfere with the detection, resulting in inaccurate detection results

Method used

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  • Coated cable joint fault early warning device and method
  • Coated cable joint fault early warning device and method
  • Coated cable joint fault early warning device and method

Examples

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Embodiment 1

[0030] see Figure 1-2 , a sheathed type cable joint fault early warning device, comprising two sections of cables 16, a cable joint connecting the two sections of cables 16, and a partial discharge sensor 12 arranged in the cable joint, said cable joint also includes upper shells that are fastened to each other body 17 and the lower case 7, the ends of the upper case 17 and the lower case 7 shrink gradually to form a receiving part for the cable 16 to pass through, the inner surface of the receiving part is provided with a rubber sealing ring 8, the upper case 17 and the lower case A plurality of reinforcing ribs 18 are symmetrically arranged on the outer surface of the body 8 , and the ends of the reinforcing ribs 18 extend to form a connecting portion 9 , which is connected and fixed by bolts 15 .

[0031] see figure 2 , the cable 16 includes a conductor layer 1, an inner semiconducting layer 2, a main insulating layer 3, an outer semiconducting layer 4, a shielding layer...

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Abstract

The invention belongs to the technical field of power cable detection, and particularly relates to a coated cable joint fault early warning device and method. The early warning device comprises two sections of cables, a cable joint for connecting the two sections of cables and a partial discharge sensor arranged in the cable joint, and each cable sequentially comprises a conductor layer, an inner semiconductor layer, a main insulating layer, an outer semiconductor layer, a shielding layer and an outer sheath from inside to outside. The cable joint comprises a conductor crimping pipe connected with the conductor layers on the two sides, a joint insulation sleeve connected with the shielding layers on the two sides and an explosion-proof net connected with the outer sheath on the two sides, the explosion-proof net surrounds the outer surface of the joint insulation sleeve, and the partial discharge sensor surrounds between the outer semi-conductive layer and the shielding layers. The partial discharge sensor is connected with an external online monitoring mechanism. Electromagnetic signal interference outside the connector can be shielded, partial discharge signals inside the cable connector can be accurately captured, the detection result is accurate and reliable, continuous monitoring of the operation state of the power cable is achieved, and safe and reliable operation of a power line is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of power cable detection, and in particular relates to a fault early warning device and method for a covered cable joint. Background technique [0002] The vast majority of high-voltage cable operation accidents are caused by partial discharge and excessively high operating temperature of cable joint conductors. Due to the effect of partial discharge, the electrical properties of the cable insulation medium will continue to age. In addition, the cable joints are prone to heat due to the existence of contact resistance. As a result, the insulation of the cable is reduced. Over time, the high voltage can break down the insulation layer, causing an explosion accident at the joint or terminal, and causing a large-scale power outage. In recent years, with the increasing shortage of land resources and the vigorous development of power construction, the penetration rate of urban underground cables is also growing r...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01K13/00G08C17/02G08C23/06
CPCG01R31/1272G01K13/00G08C17/02G08C23/06
Inventor 罗道军
Owner NANYANG POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER
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