Optical fiber temperature measurement power cable with uniform temperature electric field

Abstract

The invention discloses an optical fiber temperature measurement power cable with a uniform temperature electric field, which is characterized in that a conductive insertion strip is embedded in a corner arc gap of a tile-shaped conductor of a conductor cable core, a conductive film is embedded in a cambered surface gap of a central conductor and the tile-shaped conductor, and at least one temperature measurement optical fiber is inserted in armored steel wires which are arranged in sequence. The temperature measuring optical fiber comprises a temperature measuring fiber core and an optical fiber wrapping layer wrapping the outer side of the temperature measuring fiber core, the optical fiber wrapping layer is wrapped with a heat conduction layer, the periphery of the heat conduction layer is sleeved with metal outer pipes at intervals, and the space between the heat conduction layer and the metal outer pipes is filled with heat conduction filling paste. The heat-conducting filling paste comprises the following components: a gelling agent, an oil separation inhibitor, an antioxidant, a water absorbent, a defoaming agent and heat-conducting oil, the shielding layer is formed by wrapping a heat-conducting shielding belt, the heat-conducting shielding belt comprises a graphite diaphragm, one side surface of the graphite diaphragm is plated with a metal coating, and the other side surface of the graphite diaphragm is provided with a heat-conducting glue layer. The power cable can monitor the operation condition of the cable in real time, and has a uniform cable core temperature field and an electric field.

Description

technical field [0001] The invention relates to the technical field of power cables, in particular to a power cable including a conductive cable core and a temperature-measuring optical fiber. The power cable can not only transmit electric energy, but also monitor the operating temperature of the cable in a timely manner. Background technique [0002] With the vigorous development of high-speed railway construction, the number of applications of power cables in railway power supply lines is also increasing day by day. The working status of power cables determines the quality and safety of power supply to a large extent. Preventing cable faults, reducing the failure rate during cable operation, and improving the reliability of cable power supply are particularly important for the safe and efficient operation of railways. [0003] Regardless of whether it is a power cable used in a railway power supply system or a power cable used in other power supply systems, the core of the...

AI Technical Summary

Problems solved by technology

However, when the temperature measuring optical fiber is placed in the power cable for temperature measurement, due to the stretching, extrusion and bending of the power cable during laying or use, it may not only cause various mechanical damage to the optical fiber, but also damage the optical fiber. The working posture of the optical fiber causes the temperature measuring fiber to generate polarized light, resulting in a large temperature measurement error. For this reason, the existing optical fibers used for online temperature measurement of power cables often have a relatively complicated sheath layer, and this sheath layer It will block or delay the heat transfer of the cable or form uneven conduction, which will cause large errors in optical fiber measurement

At the same time, most of the existing shielding structures use metal shielding structures, which not only need to consume more precious metals, increase the weight and cost of the cable, but also affect the heat conduction of the cable and the accurate measurement of temperature

Images