作者：胡边^1,2, 谭丕成³, 叶源⁴, 万元^1,2, 刘宇³

作者单位：1. 湖南五凌电力科技有限公司，湖南 长沙 410004;
2. 国家电投集团水电产业创新中心，湖南 长沙 410004;
3. 五凌电力有限公司近尾洲水电厂，湖南 衡阳 421127;
4. 湖南师范大学，湖南 长沙 410004

关键词：灯泡贯流式机组;噪声;信号采集;调理电路

摘要：

大量程、高精度的噪声信号采集是基于声学特性的灯泡贯流式水轮发电机组故障诊断的前提。为此，该文设计一种灯泡贯流式水轮发电机组噪声信号采集系统，介绍噪声信号采集系统原理，完成基于两级分段组合的放大电路设计，解决传统单级调理电路不易实现全量程、大动态范围信号放大的问题，给出详细的信号放大电路、滤波电路等参数设计方法和采集卡A/D转换器分辨率计算方法。仿真和现场测试表明：该发电机组噪声采集系统的测量范围为20~140 dB，最大级线性误差为0.3 dB，可为后续基于声学谱分析的故障诊断提供可靠的数据。

Design of noise signal acquisition system for bulb tubular hydro-generating unit based on acoustic characteristics
HU Bian^1,2, TAN Picheng³, YE Yuan⁴, WAN Yuan^1,2, LIU Yu³
1. Hunan Wuling Power Technology Co., Ltd., Changsha 410004, China;
2. Hydropower Industry Innovation Center, State Power Investment Co., Ltd., Changsha 410004, China;
3. Jinwei Zhou Hydropower Plant, Wuling Power Co., Ltd., Hengyang 421127, China;
4. Hunan Normal University, Changsha 410004, China
Abstract: It is the premise of the fault diagnosis of the bulb tubular hydro-generating unit based on acoustic characteristics that the large-range noise signals are accurately acquired. In this paper, a system of acquiring the hydro-generating unit’s noise signals is designed. The principle of acquiring the noise signals is introduced, and the two-stage piecewise combined amplifier is proposed, which can solve the problem that the single-stage conditioning circuit is not easy to amplify the noise signal with the full range and the large dynamic range. In addition, the methods for solving the parameters of the amplifier and the filter, and the DAQ card are given in detail. The results of the simulation experiments and the field tests show that the measurement range of this proposed system is 20–140 dB, and the maximum linear error is 0.3 dB, which can provide the reliable data of fault diagnosis of the bulb tubular hydro-generating unit.
Keywords: bulb tubular unit;noise;signal acquisition;conditioning circuit
2021, 47(3):139-143  收稿日期: 2020-04-21;收到修改稿日期: 2020-06-18
基金项目:
作者简介: 胡边(1987-),男,湖南邵阳市人,高级工程师,博士,主要从事电力新技术、新产品开发
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