Selection device for three analog input and selection method thereof

Abstract

The invention provides a selection device for three analog input and a selection method thereof. The device comprises a first measurement instrument, a second measurement instrument and a third measurement instrument which are fixed on a measurement object. The first measurement instrument, the second measurement instrument and the third measurement instrument are respectively connected with any one terminal board input channel of an input terminal board through two leads. The positive and negative electrodes of the measurement instruments are connected with the positive and negative connecting posts of the terminal board input channel. The input terminal board is connected with an analog input module. The analog input module and a controller are connected through a standard CAN bus. A power supply module is connected with the controller and the analog input module through two power lines. The invention also discloses a selection method of the device. The device is simple in connection structure and can flexibly select three analog measurement values so that the working modes are diverse, the working modes can be flexibly switched, an output analog measurement value is accurate and reliable, the accuracy of the measurement value is not influenced by fluctuation or damage of a certain measurement point and thus the reliability is high.

Description

technical field [0001] The invention relates to the technical field of power plant control, in particular to a three-analog input selection device and method. Background technique [0002] The power generation process of thermal power units includes a large number of analog measurement values, such as main steam pressure, temperature, coal feed rate, condensate flow rate, etc. These measured values ​​directly determine whether the unit can generate electricity safely, and the accuracy of the measured values ​​is crucial to the control of the unit. Wrong measurement values ​​often lead to non-stop of the generating set, and serious accidents such as equipment damage and casualties. Therefore, thermal power plants will install multiple measuring points at important nodes, and increase the accuracy of the measured value through the selection of multiple measuring points. The selection method of multiple measuring points is very important. At present, many selection methods on...

AI Technical Summary

Problems solved by technology

The selection method of multiple measuring points is very important. At present, many selection methods only take the average value or take the middle value. This selection method has potential limitations and cannot meet the needs of thermal power unit safety control.

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