Steel penstock and expansion joint operating parameter automatic monitoring system and evaluation method thereof

Abstract

The invention discloses a steel penstock and expansion joint operating parameter automatic monitoring system and belongs to the technical field of steel penstocks. The system is used for monitoring operating parameters of a steel penstock and an expansion joint. The system comprises a remote monitoring computer, a data acquisition computer, a data acquisition instrument, sensor transducer amplifiers, a welding type strainmeter, a dynamic water pressure transducer, a temperature sensor acceleration sensor and a displacement sensor. The remote monitoring computer is connected with the on-site data acquisition computer in a wired or wireless mode, the data acquisition computer is connected with the data acquisition instrument, and the data acquisition instrument is connected with the transducer amplifiers. The invention further discloses an evaluation method of the system. By means of the steel penstock and expansion joint operating parameter automatic monitoring system, the operating states of the steel penstock and the expansion joint are comprehensively evaluated. The system is simple in structure, easy to install and achieve and suitable for large-scale popularization and application. By means of the evaluation method of the system, the problem of unicity of a theoretical analysis method and a monitoring parameter evaluation method in the prior art is solved.

Description

technical field [0001] The invention belongs to the technical field of penstock steel pipes, and in particular relates to an automatic monitoring system for operating parameters of penstock steel pipes and expansion joints and an evaluation method thereof. Background technique [0002] In water conservancy and hydropower projects, pressure pipes are widely used. They not only bear most or all of the head pressure of hydropower stations, but also bear the dynamic water pressure due to some external reasons such as sudden closure of valves and sudden shutdown of turbine units. The impact effect, the internal pressure of the pipeline caused by this water hammer is dozens or even hundreds of times of the normal working pressure of the pipeline. The impact of large pressure fluctuations on the pressure pipeline is multi-dimensional, and it is easy to cause relative displacement. In view of this, relevant national departments have strict requirements on the safe operation of pens...

AI Technical Summary

Problems solved by technology

In view of this, relevant national departments have strict requirements on the safe operation of penstocks and expansion joints of hydropower stations, and regular safety inspections are required. However, within two inspection cycles, any safety issues in the operation of penstocks and expansion joints cannot be controlled in real time

[0003]At present, the actual monitoring of the operating state of the penstock is relatively simple, such as through the finite element calculation and monitoring of the strain of the penstock to identify the strain modal change rate, In order to judge the damage state of a certain part of the penstock; or start from the corresponding relationship between the vibration frequency of the penstock and the pulsating pressure of the water flow, study the influence of the pulsating water pressure of the penstock and the expansion joint on the penstock and the expansion joint

However, as a special part of the penstock pipeline, the operating state of the expansion joint is more complicated, and its defect development state is time-varying. In a certain period of time, it is judged that the structure is safe to operate according to the relevant criteria, but as time goes by Over time, the structural operation is in an unstable state, and the existing monitoring and analysis system only analyzes, studies and evaluates a certain part, a certain parameter or a certain period of time of the penstock and the expansion joint. Large one-sidedness, unable to control its operating status in real time, and easily lead to emergencies

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