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Overhead line dynamic capacity increase method based on BOTDR thermometric technique

An overhead line and dynamic capacity-increasing technology, which is applied to thermometers, heat measurement, and measurement devices, can solve problems such as high equipment costs, difficult maintenance, and difficulty in ensuring reliability and application promotion.

Active Publication Date: 2017-05-17
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its high equipment cost, difficult maintenance, and difficulty in ensuring reliability have restricted the application and promotion of the system in the power grid, and its value cannot be brought into full play.

Method used

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  • Overhead line dynamic capacity increase method based on BOTDR thermometric technique
  • Overhead line dynamic capacity increase method based on BOTDR thermometric technique
  • Overhead line dynamic capacity increase method based on BOTDR thermometric technique

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Experimental program
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Embodiment

[0060] Below is the step that adopts the specific embodiment of the present invention, as follows:

[0061] 1. Data collection to obtain the ambient temperature of the detected overhead transmission line

[0062] 1) The Brillouin optical time domain sensor uses the optical time domain analysis method to detect the incident pulse light. Under the specific optical frequency difference setting, the power of the incident pulse light and the excitation light can be obtained respectively, and then the optical fiber layout in the OPGW can be calculated. Gain for Liouin scattered light. According to the distribution of the gain, the frequency shift of the Brillouin scattered light of the optical fiber can be obtained, and the temperature distribution of the entire optical fiber can be calculated from the linear relationship between the frequency shift and the temperature.

[0063] When the fiber is not strained, the frequency shift of the Brillouin scattered light is linearly related...

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Abstract

The invention relates to an overhead line dynamic capacity increase method, in particular to an overhead line dynamic capacity increase method based on the BOTDR thermometric technique. By means of the BOTDR thermometric technique on an OPGW, distributed measurement is conducted on environment temperatures around an overhead line, a wire temperature is derived through the Newton iteration method, and a bottleneck point of the wire real-time temperature is put into a new heat balance equation, so that a real-time current-carrying capacity is calculated. It is proved by calculation that the line current-carrying capacity can be effectively improved by means of the method, and the method plays a theoretical guiding role is played on design optimization of the line current-carrying capacity. In the method, no extra temperature sensing device is needed, the cost of a common DTP device is reduced, maintenance is simple and reliability is high. The method can be widely used in power grids, and the real capacity of a power transmission line is produced.

Description

technical field [0001] The invention relates to a method for dynamically increasing the capacity of overhead lines, in particular to a method for dynamically increasing the capacity of overhead lines based on BOTDR temperature measurement technology. Background technique [0002] Due to the resistance of the overhead transmission wire, when a certain load current flows, the resistance will "loss" a part of the electric energy and turn it into heat, and the wire will inevitably generate heat. Moreover, the temperature of the transmission wire will gradually rise with the increase of the load current. When the maximum allowable operating temperature of the wire is exceeded, it will inevitably be burned due to overcurrent and heat generation, which may cause the circuit breaker to trip. Therefore, we need to deeply excavate the hidden transmission potential of transmission lines without affecting the safety of power grid operation and without changing the structure of the origi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G01K11/32G01K11/322
CPCH02J3/00G01K11/32G01K11/322
Inventor 龚庆武杨安琪
Owner WUHAN UNIV
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