Pipe network fault hydraulic monitoring experimental system and fault identification achieving method thereof

Abstract

The invention discloses a pipe network fault hydraulic monitoring experimental system and a fault identification achieving method thereof. The pipe network fault hydraulic monitoring experimental system comprises an adjustable high-level water tank, an adjustable low-level water tank, a simulating pipe network, a low-strength transient exciter, a SCADA system and a pipeline fault simulation device. The adjustable high-level water tank simulates the water supplying pressure and flow of the upstream of a monitored water transfer project and municipal water supply pipe network reservoir, and the adjustable low-level water tank discharges the downstream water quantity; according to the actual project local pipe network physical topological structure, through diversified pipelines, a simulating pipe network provided with hydraulic measuring equipment is subjected to simulated construction and arranged; the low-strength transient exciter generates a transient flow; the SCADA system collects the simulating pipe network system parameters and the hydraulic data and conducts analysis; and the pipeline fault simulation device comprises leaking holes for simulating leaking of different sizes and gate valves or fine pipes for simulating blocking of the pipelines. According to the pipe network fault hydraulic monitoring experimental system and the fault identification achieving method thereof, leaking and blocking can be both taken into consideration, the controllable low-strength transient flow exciter and the data collecting and analyzing system are combined to achieve pipe network fault identification, application is wide, control is easy, large-pressure water hammer fluctuation is not prone to being caused, components are simple, the economical and practical effects are achieved, and promotion is easy.

Description

technical field [0001] The invention relates to a fault detection technology of a water supply pipeline and a pipe network system, in particular to a hydraulic monitoring experiment system for a pipe network fault and a method for realizing fault identification thereof. Background technique [0002] Pipeline failure, including leakage and blockage, is a common phenomenon in the process of pipeline transportation of liquid, which will cause a lot of resource loss, energy waste and environmental pollution. The theory and method of fault early warning, monitoring and fast and accurate positioning in pipeline water transmission projects, water transmission and distribution pipe networks, and urban drainage pipe networks has always been a hot demand in the current society, and has become an urgent need to solve in my country's construction of a water-saving society. One of the problems has great socio-economic and practical significance. [0003] At present, more and more attenti...

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Problems solved by technology

[0012] (1) The core of smart pipe network and dispatching is to construct the pipe network SCADA system and combine it with the real-time hydraulic model of the pipe network. Therefore, before making auxiliary decisions, the hydraulic model and the physical simulation model must be verified first. application and promotion, but in this regard, there is still a lack of systematic fault identification and diagnostic test platforms to support the verification of the two

[0013] (2) Similar to pipeline leakage, when the pipe culvert is partially blocked, it will also change the hydraulic characteristics of the fluid in the pipeline. The head loss caused by it is generally a function of the size of the obstruction and the average flow rate. The effect of water flow can be equivalent to an incompletely closed valve or a short thin pipe in the pipeline system; however, the current fault monitoring model cannot take into account the blockage, and there is a lack of basic theory and methods for identifying partial blockage in the country. method, there is no test platform that takes into account the integrated simulation of leakage and blockage

[0014] (3) The existing pipeline network fault transient detection method uses the valve at the end of the pipeline to quickly fully close or fully open to generate flow pulses or equal-amplitude sinusoidal periodic disturbances, and square wave disturbances do not meet the actual design and operation requirements.

For large-scale pipeline projects, slow valve opening and closing speeds are generally adopted to reduce the water hammer pressure on the pipeline, or to prevent liquid vaporization due to low instantaneous pressure in the pipeline, so as to ensure the safe operation of the system; for the water supply system of the pipeline network, due to various Different types of pipes (such as steel pipes, PE pipes, cast iron pipes, cement pipes, etc.) have different pressure resistance. If the pressure of the rapid closing of the valve is too high, it will easily cause water hammer problems, which may increase the risk of pipe explosion. It can be seen that the existing transient The feasibility of the flow excitation method is severely limited in practical application

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