Power cable optical fiber temperature measurement benchmark data measuring method

A technology of optical fiber temperature measurement and reference data, which is applied in the field of power cables, can solve problems such as data fluctuations, unsatisfied, uninstalled distributed temperature measurement optical fibers, etc., and achieve the effect of improving accuracy

Inactive Publication Date: 2014-10-01
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, due to the high sensitivity of optical fiber temperature measurement, the data fluctuations are relatively serious, and many cables currently in operation are not installed with distributed temperature measurement optical fibers, resulting in that when there is a temperature measurement demand, it cannot be met.

Method used

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  • Power cable optical fiber temperature measurement benchmark data measuring method

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Embodiment Construction

[0015] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0016] A method for measuring reference data of power cable optical fiber temperature measurement, such as figure 1 shown, including the following steps:

[0017] Step 1. Set the load current in the cable, and apply the specified load current on the cable through the cable circulation heating system to heat the test cable.

[0018] Step 2. During the temperature rise of the cable, measure the temperature of the outer layer of the cable sheath through the distributed optical fiber device wound on the test cable; measure the temperature of the outer layer of the cable sheath and the cable core through the thermocouple temperature measuring device , while recording the temperature change curve measured by the thermocouple temperature measuring device and the distributed optical fiber device.

[0019] In this measurement method, since the temperature data measured by th...

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Abstract

The invention relates to a power cable optical fiber temperature measurement benchmark data measuring method. The method is technically characterized by including the following steps of heating a tested cable through a cable circulating heating system, measuring the temperature of the outer layer of a cable protection sleeve through a distributed type optical fiber device wound on the tested cable, conducting fitting on an obtained optical fiber temperature measurement curve, analyzing and summarizing the change relation between the load current and the temperatures of a conductor and the outer protection sleeve, changing the magnitude of the load current, repeatedly executing the steps mentioned above to obtain the change relation between the multiple load currents and the temperatures, obtaining the temperature measurement condition of a distributed type optical fiber under multiple conditions, and providing the basis for calibration of optical fiber temperature measurement benchmark data. According to the relation between the load current and the temperatures of the cable core and the protection sleeve, by analyzing and optimizing test data, the function of calibrating the optical fiber temperature measurement benchmark data on site is achieved, simulation accuracy is improved, and the basis is provided for calibration of the optical fiber temperature measurement benchmark data.

Description

technical field [0001] The invention belongs to the technical field of power cables, in particular to a method for measuring reference data of temperature measurement by a power cable optical fiber. Background technique [0002] The existing power cable optical fiber temperature measurement method mainly relies on installing distributed temperature measurement optical fibers inside the cable body. Due to the Raman scattering effect, the anti-Stokes light in the spectrum is related to temperature changes, so as to determine the temperature on the cable line. The temperature at a certain location provides a basis for judging the line load. However, due to the high sensitivity of optical fiber temperature measurement, data fluctuations are more serious, and many cables currently in operation are not installed with distributed temperature measurement optical fibers, resulting in that when there is a need for temperature measurement, it cannot be met. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32
Inventor 李旭王楠李松原魏菊芳曹梦张黎明
Owner STATE GRID CORP OF CHINA
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