Device and method for measuring time constant of speed probe and preamplifier

Abstract

The invention discloses a device and method for measuring the time constant of a rotating speed probe and a preamplifier. The measuring device includes a rotating speed calibration platform, a magnetoresistive sensor, a preamplifier and a data acquisition instrument. When the speed measuring gear disc rotates, when the speed measuring hole groove passes under the speed probe of the magnetoresistive sensor, the gap between the speed probe of the magnetoresistive sensor and the plane of the speed measuring gear disc changes instantaneously, thereby forming The step input of the gap voltage is transmitted to the data acquisition instrument through the preamplifier. Based on the gap voltage signal, according to the transfer function model, the time constant of the speed probe and the preamplifier can be obtained by using the least square method to simulate and calculate, which provides a reliable calculation basis for the modeling of the speed control system of the steam turbine unit, and effectively solves the problem. It solves the problem that the time constant of the generator set cannot be tested statically or dynamically when the speed probe is installed in place.

Description

technical field [0001] The invention relates to a device and a measuring method for measuring the time constant of a rotational speed probe and a preamplifier, and belongs to the technical field of calibration of a rotational speed probe and a preamplifier. Background technique [0002] One of the characteristics of modern power system is the introduction of modern control theory and computing technology into the system, which creates conditions for off-line calculation and analysis of the system and on-line real-time control. However, both calculation and control must be based on accurate and credible mathematical models, including generators, excitation systems, prime movers and speed control systems, and comprehensive load models. One of the keys to the safe and stable calculation of the power system is to obtain the actual system dynamic parameters and establish an accurate mathematical model of the above system. [0003] In the past, in the analysis and calculation of ...

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