A Real-Time Reliable Condition Assessment System for 500kV Transmission Towers Based on Stress Measurement

Transmission power towers play an important role in power delivery systems. In recent years, some important results on reliability of transmission towers have been obtained based on theoretical analysis, but there are very few practical application systems of real-time condition monitoring. This paper proposes a new real-time reliable condition assessment system for 500kV transmission power towers based on stress measurement. The necessity of such systems and the architecture of the online monitoring system will first be presented. Through calculating the stress distribution condition of different components of the transmission tower under typical working conditions, those positions with relatively high failure probability in the transmission tower can be identified monitored for installing the stress sensors on them. A new method is presented for calculating the reliability index of the transmission tower structure is also developed based on the mechanical structure of the tower. In particular, the tower structure is simplified to a series system, and the Ditlevsen’s bounds is used to estimate the reliability of the tower system. Finally, a designed example for the online reliable condition assessment procedure is given using a 500kV oxytropis tower as an illustration.

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Energy Dissipation Capacity of Friction-Type Reinforcing Members Installed at a Transmission Tower

Smart Materials, Adaptive Structures and Intelligent Systems, Volume 2 ◽

10.1115/smasis2008-492 ◽

2008 ◽

Author(s):

Ji-Hun Park ◽

Byoung-Wook Moon ◽

Sung-Kyung Lee ◽

Kyung-Won Min

Keyword(s):

Energy Dissipation ◽

Local Deformation ◽

Test Results ◽

Transmission Tower ◽

Transmission Towers ◽

Tower Structure ◽

Loading Tests ◽

Energy Dissipation Capacity ◽

Reliable Design ◽

Cyclic Loading Tests

Friction-type reinforcing members (FRMs) developed for the purpose of enhancing the wind-resistant performance of transmission towers are tested experimentally. The FRMs, in the middle of which slotted bolted connections (SBCs) are installed, are placed on the outside of tower legs, and provide additional damping and stiffness to the tower structure under bending deformations. Firstly, the SBCs used in the FRMs are tested for various frictional sliding interface conditions. Secondly, the FRMs are installed on a 1/2 scale plane tower substructure and cyclic loading tests are conducted. Energy dissipation capacity and effects from local deformations of the FRMs and joint slips are investigated. From the test results, remarkable energy dissipation capacity, reaching to the 2.4 times of that before the installation of the FRMs, is observed. However, the local deformation of the SBC and joint slip should be prevented for more reliable design of the FRMs.

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IIAS: An Intelligent Insurance Assessment System through Online Real-time Conversation Analysis

Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence ◽

10.24963/ijcai.2021/721 ◽

2021 ◽

Author(s):

Mengdi Zhou ◽

Shuang Peng ◽

Minghui Yang ◽

Nan Li ◽

Hongbin Wang ◽

...

Keyword(s):

Conversation Analysis ◽

Real Time ◽

Insurance Industry ◽

Medical Insurance ◽

Practical Experience ◽

Assessment System ◽

Assessment Procedure ◽

Cognitive Workload ◽

Insurance Company ◽

Time Cost

With the development of Chinese medical insurance industry, the amount of claim cases is growing rapidly. Ultimately, more claims necessarily indicate that the insurance company has to spend much time assessing claims and decides how much compensation the claimant should receive, which is a highly professional process that involves many complex operations. Therefore, the insurance assessor's role is essential. However, for the junior assessor often lacking in practical experience, it is not easy to quickly handle such an online procedure. In order to alleviate assessors' cognitive workload, we propose an Intelligent Insurance Assessment System (IIAS) that helps effectively collect claimant information through online real-time conversation analysis. With the assistance of IIAS, the average time cost of the insurance assessment procedure is reduced from 55 minutes to 35 minutes.

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Bearing Capacity Analysis of Transmission Tower Structure Considering Corrosion Damage

Journal of Physics Conference Series ◽

10.1088/1742-6596/2148/1/012052 ◽

2022 ◽

Vol 2148 (1) ◽

pp. 012052

Author(s):

Ruizong Lin ◽

Benzhao Fu ◽

Xinmin Yu ◽

Hui Ma ◽

Zeyan Wu ◽

...

Keyword(s):

Bearing Capacity ◽

Corrosion Damage ◽

Transmission Tower ◽

Finite Element Software ◽

Coastal City ◽

Transmission Towers ◽

Tower Structure ◽

Long Time ◽

Stress Ratios

Abstract As an important part of power grid equipment, transmission towers are in direct contact with the external environment for a long time. As a coastal city in China, Fujian has been affected by marine environment and industrial pollution for a long time, which directly affects the safety of transmission towers in long-term service. In order to explore the changes of the ultimate bearing capacity of the tower structure after corrosion, this paper uses finite element software to analyse the mechanical properties of the tower structure during long-term service, and finds that the 45° wind direction is the control condition, and the overall stiffness of the tower decreases with the growth of corrosion time, and the increment of tower top displacement reaches 7% at 12 years of corrosion. The corrosion-sensitive members of the tower were clearly identified, and their stress ratios increased from 0.78, 0.79, and 0.83 to 0.97, 0.98, and 0.99, respectively, at 12 years of corrosion.

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Optimisation of Steel Transmission Tower Structure Using Firefly Algorithm

i-manager’s Journal on Structural Engineering ◽

10.26634/jste.6.2.13635 ◽

2017 ◽

Vol 6 (2) ◽

pp. 9

Author(s):

REDDY A. ANVESH ◽

KUMAR CH. NAVEEN ◽

REDDY K. AVINASH ◽

CHANDRASEKHAR K.N.V. ◽

◽

...

Keyword(s):

Firefly Algorithm ◽

Transmission Tower ◽

Tower Structure

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Ultrasonic unilateral double-position excitation lamb wave defect detection and quantification method for ground electrode of transmission tower

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-210039 ◽

2021 ◽

pp. 1-15

Author(s):

Kuan Ye ◽

Kai Zhou ◽

Ren Zhigang ◽

Ruizhe Zhang ◽

Chunsheng Li ◽

...

Keyword(s):

Guided Waves ◽

Power Transmission ◽

Geometric Model ◽

Guided Wave ◽

Quantization Error ◽

Dispersion Function ◽

Stable Operation ◽

Transmission Tower ◽

Ultrasonic Guided Wave ◽

Transmission Towers

The power transmission tower’s ground electrode defect will affect its normal current dispersion function and threaten the power system’s safe and stable operation and even personal safety. Aiming at the problem that the buried grounding grid is difficult to be detected, this paper proposes a method for identifying the ground electrode defects of transmission towers based on single-side multi-point excited ultrasonic guided waves. The geometric model, ultrasonic excitation model, and physical model are established, and the feasibility of ultrasonic guided wave detection is verified through the simulation and experiment. In actual inspection, it is equally important to determine the specific location of the defect. Therefore, a multi-point excitation method is proposed to determine the defect’s actual position by combining the ultrasonic guided wave signals at different excitation positions. Besides, the precise quantification of flat steel grounding electrode defects is achieved through the feature extraction-neural network method. Field test results show that, compared with the commercial double-sided excitation transducer, the single-sided excitation transducer proposed in this paper has a lower defect quantization error in defect quantification. The average quantization error is reduced by approximately 76%.

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