"1.20"安顺电厂断路器拒动保护动作分析

1月20日贵州省安顺电对液压机构的解剖,分析了断路器拒动的原因;通过保护动作时的特征量,统一了保护分析的时间轴,从而解释了断路器拒动过程中各保护的动作行为.经过分析,各保护动作行为正确,为今后断路器液压机构的维护和分析类似的事故积累了经验,并提供了借鉴.     

浅析35kV户外真空断路器跳闸线圈烧毁

结合本运维操作站110 kV下村变电站35 kV下皇线线路故障保护动作321断路器拒动,造成主变中后备保护动作故障,来进行综合分析排查原因,通过理论分析和现场检查提出引起断路器拒动的原因为跳闸线圈烧毁,根据拒动原因分析和运行经验提出了断路器拒动的防范措施,来防范跳闸线圈烧毁引起断路器拒动的机率。     

一起500kV断路器拒动事故的分析

针对一起500kV断路器拒动事故,阐述了液压机构的工作原理,分析了断路器拒动原因,可以为断路器液压机构的维护和分析类似的事故所借鉴。     

大坝发电厂^#3发变组出口断路器拒动行为分析及对策

大坝电厂~#3发电机组,在停机解列过程中,当断开出口断路器(8203开关)时,出现了8203开关 B 相拒动行为。造成了~#1发电机组与系统解列,220kV 三组母线联络开关跳闸,220kV 大青丙线及大关乙线跳闸、220kVI_A 母线失压的事故扩大。对造成8203开关 B 相拒动的原因和保护动作情况进行分析,找出引起开关拒动的原因,提出针对性的防范措施,以便彻底清除隐患。     

LW6B型SF6断路器运行中的问题及预控措施

如果断路器跳闸失灵,对电力系统的安全、可靠运行会有很大的危害。因为当线路发生故障时,断路器开关拒绝分闸,不能将故障切除,会导致越级跳闸,造成母线失压,使事故范围扩大,甚至使系统瓦解。LW6B型SF6断路器最近发生过几起开关拒动事故,导致越级跳闸和大面积停电的恶性事故,造成了严重后果。该型号断路器由平顶山高压开关厂生产,操作机构为液压式。1故障情况1.1事故12004-01-16,某供电公司110kV线路由于覆冰发生故障,导致绝缘子击穿,保护动作正确,但线路断路器开关拒动,越级后主变后备保护动作,最终导致母线全部失压的事故。1.2事故22005…     

断路器拒动引起110kV变电站失压的事故原因分析

对一起由于110 kV断路器拒动引起2座110 kV变电站失压的事故原因进行了分析。在现场检查、线路巡查以及雷电定位相关数据分析的基础上,结合保护动作报告、录波数据、事件顺序记录等,对事故中线路跳闸、断路器拒动和保护动作情况进行了分析,认为单环网的薄弱电网结构是引发事故的根本原因,而小水电站未安装过电压及高低周保护装置、易遭受雷击的杆塔未采取防雷措施等是导致事故的间接原因。提出优化电网结构,改造变电站110 kV母线接线方式,在易受雷击杆塔上安装线路避雷器,重要线路断路器配置双跳闸线圈等整改措施。     

ZN12—10型断路器与微机型保护配合问题及解决

分析了一次10kV出线开关柜因保护与断路器动作特性不匹配而在故障情况下拒动导致主变低压侧断路器跳闸的原因,提出了解决方法和防范措施,对防止此类事故有很好的借鉴作用。     

一起断路器单相拒动事故的分析

通过对北京京丰燃气热电有限公司2201断路器C相拒动事件的调查及分析,在二次回路上找出了其拒动的原因,并分析了保护在断路器非正常合闸状态下的动作行为。由这次实际事故的分析,给二次回路的设计及保护定值的计算提供了改进意见。     

高压电网断路器失灵保护

断路器失灵保护广泛应用于220 kV及以上电网中,以及110 kV电力网的个别重要部分,是作用于断路器跳闸的重要的近后备保护. 在输电线路、变压器或母线的电气设备发生故障时,继电保护动作发出跳闸命令,可能发生因断路器跳闸线圈故障,操作机构失灵,压缩空气或绝缘油的压强下降,导致断路器拒动,断路器失灵保护利用故障设备的保护动作信息与拒动断路器的电流信息构成对断路器失灵的判别,能够以较短的时限切除同一厂站内其他有关的断路器,使停电范围限制在最小,从而保证整个电网的稳定运行,避免造成发电机、变压器等的严重烧损和电网的崩溃.     

一起500kV断路器拒动事故的分析

断路器是电力系统中的重要电器。它不仅能关合正常的负荷电流和空载电流,同时在线路和电气设备发生故障时,能可靠安全地切除故障电流,将故障线路和设备隔离,避免事故的扩大,使电力系统安全稳定地运行。本文就一起500kV断路器拒动事故,通过对液压机构的解剖,分析了断路器拒动原因,为今后断路器液压机构的维护和分析类似的事故积累了经验,并提供了借鉴。     

浅谈高压断路器的偷跳分析及改造

分析了某些液压机构断路器因其分闸线圈上的最低动作电压过低,在变电站的强电磁干扰下出现的"偷跳"现象,提出了改造方案.     

Reducing Interrupting Duties of High-Voltage Circuit Breakers by Increasing Contact Parting Time

The interrupting duty of high-voltage circuit breakers can be reduced by increasing the contact parting time, which is the sum of tripping delay and the circuit breaker opening time. The contact parting time is fixed; however, the tripping delay can be increased. Although this method is not discussed in current technical literature, it is valid according to the ANSI/IEEE standards. Immediate replacement of the circuit breakers or other alternatives to reduce interrupting duties can be avoided, resulting in large cost savings and process downtime. The problem occurred in a large paper mill distribution system, where the circuit breakers were applied well within their close and latch ratings but the interrupting duty exceeded by 6%. By introducing an additional tripping delay of one cycle, the interrupting duty is reduced and the existing breakers are retained in service. This paper demonstrates these calculations.      

“Right sizing” circuit breakers in motor starters

Instantaneous-trip, molded-case circuit breakers (MCCBs) have been applied successfully for low-voltage motor protection for many years. However, the changes in motor-starting characteristics have created more difficult challenges for the application engineer. The major challenge is successfully starting the low-voltage motor without causing the instantaneous-trip breaker to falsely trip without exceeding equipment ratings or violating limitations in the National Electrical Code (NEC). "Right sizing" circuit breakers for use in low-voltage combination motor starters is critical to the successful, reliable operation of plant and process facilities. If not properly applied, false tripping on motor starting and contact welding of contactors may occur. Moreover, changes in the NEC and improved motor efficiencies have impacted equipment selection and protection. The following information is intended to guide application engineers in their selection of the right breaker and its setting for more reliable motor protection: combination motor-starter components, circuit breaker characteristics, circuit breaker and combination. starter testing, motor starting characteristics, and component selection using coordination examples. The examples show how selecting the right breaker and breaker setting can avoid false tripping during starting, mitigate contact welding, and provide backup protection for overload conditions     

断路器跳闸脉冲监测系统的研制与应用

跳闸脉冲监测系统包括跳闸脉冲监测器和手持式阅读器。跳闸脉冲监测器由超低功耗单片机、时钟芯片、红外数据传输模块、脉冲感应模块等组成,通过感应方式监测断路器跳闸回路中的跳闸脉冲,记录跳闸发生时刻和跳闸脉冲宽度。手持式阅读器通过红外通信方式从跳闸脉冲监测器读取相关数据并与GPS时间进行对比,显示跳闸发生的绝对时间和脉冲宽度。通过合理布置监测点,可以快速甄别断路器跳闸是由二次回路故障所引起,还是由断路器机构本身原因所引起,可以有效地缩小查找范围,快速找到故障点。     

Application guidelines for instantaneous-trip circuit breakers incombination motor starters

This paper addresses the application of instantaneous-trip molded-case circuit breakers (MCCBs) in combination motor starters. These circuit breakers have been widely used in many industries for motor circuit protection. If they are not properly applied, situations of false tripping on motor starting and contact welding of contactors under low-level faults may occur. Energy efficiency motors compound the issue of false tripping on motor starting. This paper discusses the components of combination starters, reviews testing requirements, and provides examples of coordination with analysis of application issues and solution options     

防止合闸、跳闸线圈烧坏的反事故措施

针对各地变电站普遍存在的10kV断路器烧坏合闸、跳闸线圈的问题,依据常用的10kV断路器控制回路图和判断线圈故障的原则,给出了确定合闸、跳闸线圈故障的测试方法,分析了线圈烧坏的原因,评价了常用处理方法的不足,提出通过加装时间继电器来解决该问题的方法,并给出了具体的控制回路图。     

Sequential tripping of steam turbine generators

The practice of tripping the generator breakers immediately following a boiler/turbine trip exposes a steam turbine generator to a potentially damaging overspeed operating condition. This paper describes the use of the sequential trip mode as a means of minimizing the exposure to possible unit damage following a boiler/turbine trip. Included is a comparison of the application of devices used by several major steam turbine generator manufacturers in accomplishing sequential tripping of the unit. This paper also discusses the differences in the devices used in implementing the tripping scheme and those applied as backup motoring protection. Additionally, the paper provides guidance in the selection of which functions should and should not be used to initiate sequential tripping     

断路器脱杆与其失灵保护配置探讨

结合华能集团10家电厂的主变高压侧断路器失灵保护配置情况及断路器失灵事故的案例分析断路器脱杆事故的原因,提出电厂主变高压侧断路器的失灵保护应合理选择失灵保护配置,完全按照继电保护技术规程要求不配置闭锁元件。发变侧断路器失灵保护应选负序或零序电流判据,具有更高的灵敏度。     

万能式断路器电流脱扣特性的自动检测

设计了大电流检测系统对1SW45(DW45)断路器的脱扣时间进行自动检验，通过图形化编程软件LabVIEW和VC 的结合使用，在采样、自动凋流、驱动步进电机都使用了动态联接库，实现对断路器的脱扣特性进行全自动的检测。     

一种断路器液压弹簧机构泄压控制系统及方法

当变电站某条线路进行停电检修作业时,需要将相应间隔断路器已储满的能量泄掉,实现闭锁功能,从而防止断路器误动作。本文以液压弹簧操动机构的释压原理为理论基础,结合实际应用,介绍了一种断路器液压弹簧机构的远程泄压控制系统。该系统通过安装在液压弹簧机构的电动推杆顶压液压阀,电动推杆运动到位后,液压弹簧机构开始泄压,释放储能弹簧能量。液压机构只有在电动推杆恢复后,才能通过储能电机开始储能。该系统可以在断路器分闸后控制液压弹簧机构自动泄能,有效防止断路器误合事故的发生。本系统适用于无人值守变电站。