Routine maintenance of high - voltage （ hv ） circuit breaker is very time consuming and resource hungry . the traditional scheduled maintenance or time based maintenance ( tbm ) has some serious defects , such as sub - maintenance , over - maintenance and the faults caused by the maintenance itself 我国目前采用的“到期必修”的计划检修体制存在着严重的缺陷，如临时性维修不足，维修过剩，盲目维修和因检修不当而引发检修事故。
The application and characteristics of the automatic meters system of kela 2 gas field were reviewed in this paper , referable experience and data were gained for large - scale gas field ( condensate field ) of tarim oil field , and some valuable advices were given for the routine maintenance and manage of the automatic system 摘要对克拉2气田自动化系统的使用现状及特点进行了分析，为塔里木油田大型天然气田（凝析气田）和股份公司相似气田的开发提供了可借鉴的经验和依据，同时为自动化系统的日常维护和管理提出了相应的意见和建议。
Fieldbus builds up interconnections among field instruments and field control units by providing a wholly digital , bi - directional and multi - variant communication path , which has no i only greatly improved the reliability and ability of anti - disturbance , but also sharply reduces the costs of installation and routine maintenance . can ( controller area bus ) belongs to the asynchronous communication network 现场总线使得现场仪表之间、现场仪表与控制设备之间构成网络互连系统，实现全数字化、双向、多变量的数字通讯，这大大地提高了系统的可靠性和抗干扰能力，同时节省了整个系统的投资、安装及后期维护费用。
The common information they need are various types of job standards , operation regulations and working data . operators need telephone number list , formulated vocabulary , problem process program , while technicians need the working status information of the equipment ( normal , abnormal , busy , idle ) , exception handles , routine maintenance procedures and the equipment configure data . the users of controlling layer are directors in charge of administration or technology who concerned with the operation of ccs 他们所需的信息主要有:各类工作标准、操作规程、业务资料，如话务员需要电话号码簿、接转规范用语、疑难问题处理程序及案例;纠察员需要话务员接续过程录音、用户申告内容和纠察评分标准;技术员需要设备工作状态(正常、异常、繁忙、空闲)信息、故障处理程序、例行维护程序、设备配置资料;受训人员需要训练课程计划、教学课件等。
At present , we can track the signaling links in the 155 mbs ports of a switch only by using the signaling of the switch itself rather than the external analyzer of the ccs 7 . this causes inconvenience to maintenance . it is expected that manufacturers will enhance the tracking and monitoring functionality of their products and training switching and maintenance personnel concerning routine maintenance of the 155 mbs port 目前，我们只能利用交换机本身的信令观察手段对交换机155mbits端口中的信令链路进行跟踪、分析，而不能通过外挂七号信令分析仪对信令进行监测，给维护工作带来了不便，有待于生产交换机的厂家加强这方面的功能。
Through extensive discussions with owners of the cwpss , government consultants and electrical and mechanical services department , an optimum design of the cwps was achieved to fulfill the requirement of minimum width and ample space within the pumping station for operational and routine maintenance need 经与抽水站的业主政府顾问及机电工程署广泛讨论后，建议中的冷却用水抽水站已是最理想的设计方案。这方案既可尽量缩减阔度，亦可有足够的空间进行运作及日常保养。
