Online calibration method for vibration sensor

Abstract

The invention discloses an online calibration method for a vibration sensor. At present, since a vibration sensor is inconvenient to disassemble or cannot be disassembled and the like, the vibration sensor needs to be stopped and powered down for calibration, the sensor needs to be disassembled completely to be sent to a laboratory for detection, and the calibration needs to rely on a standard vibration table, so that equipment requirements are high, and the workload of workers is heavy; particularly, the vibration sensor needs to be stopped and powered down, which is contrary to the trend ofstate monitoring and overhaul. According to the online calibration method, the vibration sensor is provided with a signal coil to form a measuring circuit for measuring the displacement and characteristic parameters of the vibration sensor; a calibration coil is added to the vibration sensor, the relationship between the signal coil and the calibration coil is determined through a transfer function analogy equation, and on-site calibration or in-situ calibration can be achieved through electrical calibration. The online calibration method achieves on-site calibration or in-situ calibration when the vibration sensor works, and achieves real-time calibration of vibration data in the uninterrupted generation and transmission process.

Description

technical field [0001] The invention relates to the field of calibration of vibration sensors, in particular to an online calibration method of vibration sensors. Background technique [0002] At present, a large number of vibration sensors used in China are distributed in industries such as earthquakes, railways, bridges, electric power, machinery, and petrochemicals. In the power system, vibration sensors are also widely used in unit monitoring in the power generation link, tower line monitoring in the power transmission link, and transformer monitoring in the substation link. They play a vital role in the safe and stable operation of the power system. [0003] However, most of these vibration sensors have the following disadvantages: [0004] 1) Operation testing and maintenance must be shut down and power off [0005] Vibration sensors are often installed on the shell of the vibrating part or inside the shell, and some are directly installed on high-voltage towers or ...

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Problems solved by technology

[0006] 2) The sensor must be disassembled and sent to the laboratory for testing

But in actual application, the sensor is installed on the monitoring part, the conditioner is installed in the control room, and the extension cable is installed in the long-distance curved pipe connecting the monitoring part to the control room, so disassembly and installation are very troublesome

[0008] 3) The detection must rely on the standard vibration table

[0011] Condition monitoring and maintenance are mostly based on data collection, transmission and processing, but insufficient attention is paid to data generation

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