故障信号

And the lathe can start in advance, start, stop in advance, stop promptly, go backwards promptly, count, and have the function of choose the aiguilles online / off-line.

并具有预开、启动、预停、紧急停止、紧急后退和计数功能，具有动力头在线／离线选择功能，具有短路保护、过载保护、失压保护、超节拍保护功能，及故障报警和信号显示功能

In order to improve the measurement accuracy of leakage current of zinc-oxide lightning arresters to ensure the validity and reliability of false diagnosis for the equipment, the wavelet transformation is applied to eliminate the noise in the test signal.

为提高氧化锌避雷器泄漏电流的测试准确度，以确保设备故障诊断的有效性和可靠性，采用小波技术对现场信号进行消噪处理。

Based on that, a comprehensive on-line approach to detect rotor bar breaking fault is presented.

基于定子电流信号分析，本文提出了基于EMD的异步电动机轴承故障在线检测方法。

This technique improves the detecting sensitivity of broken rotor bar fault by employing wavelet transform and adaptive stochastic resonance.

通过应用小波消噪、随机共振技术，改进了转子断条故障特征信号的检测灵敏度。

The results of laboratory experiment and filed operation indicated that the system operated stably and could credibly evaluate the insulation state of DC feeder cable.

实验室试验及现场运行结果表明综合监测直流泄漏电流和直流放电信号能够较好及时地诊断出电缆故障，研制的系统稳定、可靠，能够评估直流电缆绝缘状况。

Flash set ; alarm signal ; DC source ; relay protection ; trouble treatment

闪光装置；预告信号；直流电源；继电保护；故障处理

The following functions can be realized: Measuerment:the effective values of three phase current and voltage, power frequency, active power, reactive power, power factor etc. Motor control: direct starting, converse starting, star and triangle starting, self-starting. Protection:thermal overload protection, current leakage protection, open-phase protection, three-phase unbalance protection, over voltage protection, loss voltage protection, low load protection and fault warning and fault dates memory. Communication: communication of the computer in control room and the microcomputer monitor in the spots is realized by the interface of RS-485. The motor is not only controlled in the spots but also in control room. The dates, information and some functions are shared by the spots and control room too.

该电动机监控器以80C196KC单片机为核心，通过采样三相电流﹑电压信号来实现以下功能：三相电流﹑电压有效值，电网频率，有功功率，无功功率及功率因数等的测量；对电动机实现直接、正反转、星三角及自起动控制；对电动机实现热过载、漏电、断相、三相不平衡、过压、欠压及轻载保护，对故障进行报警及数据记忆；通过RS-485串行接口与中央控制室计算机实现通信功能，对电动机既可本地，也可远程控制；实现控制现场与控制室之间数据、信息、功能共享。

Suppose the system went wrong (system frequency saltated at 100s and then recovered at 200s), the Wavelet function of signal processing is Daubechies Wavelet.

假设系统工作到100s时发生故障，频率发生突变，持续到200s时恢复正常，信号分析采用的小波函数为Daubechies小波。

A new algorithm of discrimination between inrush currentand fault currentof transformer is brought forward based on self- correlation analysis,which is to calculate self- correlation coefficients of variant periods after analyzing the sam pling data and then discrim inate between inrush current and fault current by using the m agnitudes of the calculated coefficients.

提出一种利用数字信号处理中的相关函数的基本概念，对采样数据进行分析，计算采样数据在不同时段上的自相关系数，利用自相关系数的大小来区分变压器励磁涌流和内部故障差流的新方法。

Combined with the need of measuring branch resistance and judging breakdown branch when insulation monitor of naval vessel power network is working, a large\|caliber feeble current transformer using as collecting leak current signal is designed , and the experimental datas are given.

结合舰船电力网络绝缘监测装置进行支路电阻测量与故障支路判断时的需要，设计了采集漏电流信号的大口径弱电流传感器，并给出了试验数据。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。