Ps4人流后怎么保养子宫?

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备案编号:沪ICP备号-6 | 沪网文[2号PS4-141-MM1一流的质量和价格来为您服务  QQ & 电话
不安装单相接地自选装置,接地保护不能判断出哪条线路接地。调度值班员可以利用远动装置,采用试停出线开关的办法寻找接地线路。一般先停线路长分支多,历次故障多负荷轻用电性质次要的线路,后停线路短分支少,负荷重的线路,专用线路应先通知或转移负荷后再试停。当试停某路开关后,接地显示并没有消除时,表明此线路没有发生单相接地,应立即再合上开关。但当这条出线有电缆线路时,应等一段时间约5-10分钟后再合闸。这是因电缆线路停电后仍保留一定电压值,停电后会通过线路电阻放电,使残压变低。如果立即送电,电源电压和电缆内电压叠加,将击穿电缆绝缘。
当试停某路出线开关后,接地显示消除,说明这条线路发生了单相接地。调度员应通知线路运行管理单位,并将接地判断结果一起讲明,以便帮助寻找接地故障点。
2.单相接地故障的寻查方法
(1)先巡线检查,后分段试停电寻查。城网10kV线路供电半径较短,分支线又少。电网白天发生单相接地故障时,线路停电后,派员对故障线路先进行巡视检查,查出接地点后,及时进行处理,以便恢复线路供电。但因有的缺陷巡线不易发现,所以送电后线路又呈现单相接地现象。此时,在不停出线开关的情况下,先停线路末端大分支线路开关,尤其是有电缆线路的分支线路,若电压显示正常,说明接地点就是此分支线路,否则再停2#分段开关,或中段大分支线开关等,先找出线路故障段,再进行巡线检查,尤其是检查电缆终端头。对故障段的电缆分支线路,可用兆欧表遥测电缆芯线对地绝缘,若芯线接地,先将故障电缆线路分割,及时恢复正常线路供电,然后再进行处理。这种寻找接地故障点的方法,不但准确,而且可以减少对电缆线路的冲击次数,能避免电缆线路发生故障。
(2)先分段试停电,后巡线寻查
农网10kV线路,线长面广分支线又多。当电网某条10kV线路发生单相接地故障时,变电站因此先断开了出线开关。线路维护单位得到调度员通知后,派员将该线路末端2#分断开关断开,并要求调度员合上10kV出线开关。若接地现象消失,表明是末段线路发生单相接地,经巡线检查查出接地点后,及时进行了处理,再合上2#分段开关,使该段线路恢复了供电。若接地现象没有消失,说明不是末段线路单相接地。在出线开关不停电的情况下,再断开中段线路大分支开关,最后断开线路1#分段开关,若接地现象消失,要求对路进行巡查检查,查出接地点进行处理后,合上1#、2#线路分段开关、分支线开关,全线路恢复了正常供电。因此用这种寻找接地故障点的方法,能节省巡线查找故障点的时间。尤其在夜间线路发生接地故障时更为适宜。
3.短路故障的判断及寻查
(1)实现10kV配网自动化,判断短路故障段
配网自动化主要功能有:馈线发生相间短路故障时,能故障报警并根据馈线出线开关,分段开关的馈线终端(FTU)记录故障前及故障时的主要信息,经计算机系统分析和故障差动功能,判断出故障区段和非故障区段,使故障区段的分段开关跳闸,实现故障区段隔离和非故障段恢复供电。这样,可以根据判断结果,派员对故障区段进行巡视检查,查出相间短路点,经处理后,对故障区段线路恢复供电。
(3)利用继电保护装置判断短路故障区段
在未实现10kV配网自动化的线路,变电站出线开关,装有微机电流速断和定时限0.7秒&1.2秒定时限过电流保护。电流速断保护,是按线路三相短路电流整定时,而且不能保护线路全长。定时限过流保护和分断开关瞬时过电流保护,是避开线路最大负荷而整定的,可以分别保护线路全长和各分段线路。当线路末端短路时,主干线1#、2#分段开关可能无选择性都跳闸。如果将分段开关保护改造成带时限动作并和出线开关定时限保护相配合,就可以达到选择性了。因此,我们可以按照保护的动作情况和保护范围,判断短路故障段,然后派员对线路故障区段进行巡视检查,寻查短路点,经处理后恢复全线路供电。这里值得注意的是:如果变电站10kV出线是电缆出线,或架空线路中有分支电缆线路时,10kV出线保护应退出重合闸装置,更不能开关跳闸后再进行试送。这是因为电缆线路故障多为永久性质,若用重合闸使开关重合,或进行试送。必然会扩大故障范围,对设备造成不应有的损失。因此,当出线开关跳闸后,应首先检查线路首端的架空线路,若线路正常再对出线电缆使用兆欧表进行初步绝缘测量,确定电缆故障后,再用电缆故障测试仪,确定电缆短路点位置,重新制造接头或更换新电缆处理后及时恢复对线路供电。随着微机继电保护的普遍应用,保护装置逐步具备了相应的数据接口,可实现保护装置重要信息的数据远传。充分利用数字式保护的技术特征,实现数字式保护的状态检修,改变目前保护装置计划检修模式,将预防性试验改为预知性试验,提高设备的安全运行水平,已成为一种共识。
状态检修也叫预知性维修,首先由美国杜邦公司提出,以设备当前的工作状况为检修依据,通过状态监测手段,诊断设备健康状况,确定设备是否需要检修或最佳检修时机。状态检修的目标是减少设备停运时间,提高设备可靠性和可用系数,延长设备寿命,降低运行检修费用,改善设备运行性能,提高经济效益。状态检修是建立在设备状态有效监测基础上,根据监测和分析诊断的结果安排检修时间和项目,主要包含设备状态监测、设备诊断、检修决策三个环节。状态监测是状态检修的基础,状态监测是设备诊断的依据,检修决策就是结合在线监测与诊断的情况,综合设备和系统的技术应用要求确定具体的检修计划或策略。电力系统长期以来实行的以预防性计划检修为主的检修体制,主要依据检修规程来确定检修项目,存在设备缺陷较多的检修不足,设备状态较好的又检修过度的状况,一定程度上导致检修的盲目性,实际上很难真正实现&应修必修,修必修好&的检修目标。
电气设备根据功能不同可分为一次设备和二次设备,其中电气二次设备主要包括继电保护、自动装置、故障录波器、就地监控和远动等。随着一次设备状态检修的推广,线路不停电检修技术的应用,因检修设备而导致的停电时间将越来越短,从客观上对电气二次设备检修提出了新的要求。作为电气二次设备重要组成部分的继电保护,承担着保障电网稳定和电力设备安全的重要职能,在实际运行中因继电保护造成的系统故障时有发生,尽管随着数字式保护装置的广泛使用,保护不正确动作次数相对减少,但由于制造、设计、施工、试验、运行等各种原因造成的保护不正确动作绝对次数仍然很多。作为保障继电保护正确履行电网&静静的哨兵&职能的主要手段,依旧是依据传统的《继电保护及电网安全自动装置检验条例》,通过定期检修维护保护装置的可用率。显然,这种基于静态型设备的检验规定已经不适应现代信息技术被广泛应用的数字式保护。
因此,继电保护设备如何在检修体制、检修方法及检验项目、检修周期等方面,通过合适的技术措施和手段,保证保护设备的可靠运行适应电网安全运行的要求,实行保护设备状态检修将成为一种必然的选择。
二、保护状态检修需求
传统的继电保护、安全自动装置及二次回路接线是通过进行定期检验确保装置元件完好、功能正常,确保回路接线及定值正确。若保护装置在两次校验之间出现故障,只有等保护装置功能失效或等下一次校验才能发现。如果这期间电力系统发生故障,保护将不能正确动作。以往的保护检验规程是基于静态型继电器而设计的,未充分考虑到数字式保护的技术特点,对数字式保护沿用以前规程规定实施的检修周期、项目不尽合理。
同时,现在电网主接线方式在很大程度上限制了设备停役检修的时间,如一台半断路器接线方式的线路保护很难实现停电检修,除非结合线路停电检修;双母线接线方式已逐步取消旁路开关,变压器保护很难因保护校验而要求变压器停电,母差保护、失灵保护的定期检验安排更是困难重重。
另一方面,带电校验保护具有实施上的安全风险和人员安全责任风险。因此,在实际运行中基本上很难保证保护设备可以有效地按照《继电保护及电网安全自动装置检验条例》的要求完成检验项目。尤其数字式保护的特性在很大程度上取决于软件编程,这并非可以通过传统的检验项目来发现保护特性的偏差,实际上,传统检验规程所确定的检验项目合理性已面临新技术应用的挑战。数字式保护的实现技术使保护设备本身具有很强的自检功能。因此,作为装置本身的监测和诊断已具备实现的可能,保护装置检修决策的确定具有了可靠的基础。同时,电气设备状态检修其概念上的合理性和技术上的可实现性,使保护实行状态检修模式具有极强的示范效应,检修效率的提高和设备可靠性的提升,将能有效地提高设备的安全性和可用率,适应电力系统安全稳定运行的需要。
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ALLEN BRADLEY 700DC-F400Z1 SER B 115V-DC DC ConTROL RELAY B470315
STROMBERG OKYM 175W22 220/240V-AC 150HP 400A AMP SIZE 5 AC ConTACTOR B409718
WESTINGHOUSE A211K1CA 120/110V-AC SIZE 1 27A AMP AC ConTACTOR B377899
ALLEN BRADLEY 100S-C30D14C GUARDMASTER 120V-AC 25HP 55A AMP AC ConTACTOR B378094
NEW ALLEN BRADLEY 70A86 120V-AC ConTACTOR COIL D498987
NEW GENERAL ELECTRIC GE 104X149CC-031 SHUNT INSTRUMENT 100MV ConTACTOR B469669
SIEMENS 3TFV-DC 5HP 20A AMP AC ConTACTOR D504676
ALLEN BRADLEY 509-AOD-7 110/115-120V-AC 5HP 18A AMP SIZE 0 AC ConTACTOR B435262
NEW SIEMENS LEN00D003120A HEATING & LIGHTING ConTACTOR 120V-AC 60A AMP D515377
NEW CR360L41402AAAZ 120V-AC 60A AMP LIGHTING AC ConTACTOR D482327
JOSLYN CLARK 5DP1-5021-11 DEFINITE AC 500V-DC 120V-AC 30A AMP ConTACTOR B324891
SIEMENS 3UN8 THERMAL MOTOR PROTECTION UNIT 110/115V-AC AC ConTACTOR B474179
NEW ALLEN BRADLEY 100-A38NZ243 24V-DC 30HP 38A AMP DC ConTACTOR D402844
ABB A9-30-10 CA5-22M ConTACT BLOCK 110-120V-AC 7.5HP 25A AMP ConTACTOR B455859
NEW AEG 910-302-625-22 120V-AC 15HP 20A AMP AC ConTACTOR D488714
ALLEN BRADLEY 500L-BOB94 SIZE 1 110/115-120V-AC 30A AMP AC ConTACTOR B432254
ALLEN BRADLEY 100S-C09D14C GUARDMASTER 110/120V-AC 7.5HP AC ConTACTOR B421907
CUTLER HAMMER C50FN3 120V-AC 100HP 135A SIZE 4 REVERSING AC ConTACTOR D473071
CUTLER HAMMER MC10DN3 EATON SIZE D 110/120V-AC 30HP AC ConTACTOR B452335
KLOCKNER MOELLER DIL0-22-NA 115V-AC 10HP 33A AMP AC ConTACTOR B452530
CMC CLEVELAND M0-05378 ARMATURE OPTION KIT REVERSING 115V-AC ConTACTOR B242013
SPRECHER+ SCHUH CA3-12-10 3P POLE MOTOR AC 24V-DC 10HP 10A AMP ConTACTOR B365814
ALLEN BRADLEY
120V-AC 50HP 90A AMP SIZE 3 AC ConTACTOR B456624
NEW ASEA EG 160 120V-AC 100HP 135A AMP SIZE 4 AC ConTACTOR D482075
CUTLER HAMMER
REPLACEMENT PARTS ConTACTOR D390161
CUTLER HAMMER A211K1CA
120V-AC 10HP 27A REVERSING ConTACTOR D513994
CUTLER HAMMER C800ENY2 600V-AC RELCON SER CB1 120V-AC 65A AMP ConTACTOR B302758
LOVATO BG0031A ConTROL RELAY 120V-AC 10A AMP AC ConTACTOR B376765
ALLEN BRADLEY 100-A12NZD3 ConTROL 3P 115V-DC 10HP 12A AMP DC ConTACTOR B415994
GENERAL ELECTRIC GE CR106AP3 115V-AC 50HP 100A AMP SIZE 3 AC ConTACTOR B453099
SIEMENS 3TB43 17-6E 600V-AC 115V-AC 15HP 30A AMP REVERSING AC ConTACTOR B396639
ALLEN BRADLEY 100-A09ND3 SERIES B 120V 5HP 9A AMP AC ConTACTOR D498168
CUTLER HAMMER MD-810 SIZE 8 FULL VOLTAGE DC 1350A AMP ConTACTOR D278049
ALLEN BRADLEY 509-BOD 110/115-120V-AC 27A AMP SIZE 1 SER B AC ConTACTOR B462084
ALLEN BRADLEY 100S-C09ZJ14C SERIES A 600 VAC MAXIMUM 24V-DC ConTACTOR B220404
DAVIS ConTROLS 4D73 H041A608 MECHANICAL 115V-AC 10A AMP ConTACTOR B356606
AUTOMATION DIRECT GH15BN 3 PH 3P AC 110/120V-DC 7.5HP 20A AMP ConTACTOR B352686
ALLEN BRADLEY 702L-BAA-94 SER K 120V-AC ConTACTOR B421806
MOELLER 22-DIL-EM AUXILIARY ConTACT 24V-DC 5HP 15A ConTACTOR B416701
SPRECHER+ SCHUH CA 1U-10E1 600V-AC AC 110/120V-AC 10HP 20A AMP ConTACTOR B351870
KLOCKNER MOELLER DIL00-41/C 110V-AC 4KW 20A ConTACTOR D307084
GENERAL ELECTRIC GE 188A5535G1 SHUNT 2400V-AC 400A AMP ConTACTOR D343394
GENERAL ELECTRIC GE ICDB 230V-DC 900A AMP DC ConTACTOR D467844
ALLEN BRADLEY 100-A24ND3 SER C 110/120V-AC 20HP 24A AMP ConTACTOR B340463
ALLEN BRADLEY 100S-C37D14C SAFETY 110/120V-AC 30HP 60A AMP AC ConTACTOR B374203
TELEMECANIQUE LP1D0910 24V-DC 7.5HP 20A AMP ConTACTOR D510803
NEW ALLEN BRADLEY
COIL REPLACEMENT PARTS 400A AMP ConTACTOR D316654
GENERAL ELECTRIC GE
A ARC CHUTE REPLACEMENT PARTS ConTACTOR B358863
ALLEN BRADLEY 100-C09DJ10 SER A 100-FSV55 AC 24V-DC 7.5HP 25A ConTACTOR B357682
NEW CUTLER HAMMER 30B4375G12 TYPE MR DC ConTACTOR COIL 250V-DC D515516
LOVATO BF0V-AC 10A AMP ConTACTOR B374519
GENERAL ELECTRIC GE IC G 230/250V-DC 1500A AMP DC ConTACTOR D495826
SIEMENS RCN 40 AC 110/120V-AC 10A AMP ConTACTOR B333966
ABB A30-30-01 3PH 110-120V-AC 30HP 50A AMP ConTACTOR D494993
GENERAL ELECTRIC GE CL04A310M 110/120V-AC 4P 25HP 60A AMP ConTACTOR D469179
GENERAL ELECTRIC GE 188A5535G1 SHUNT 2400V-AC 400A AMP ConTACTOR D400312
GENERAL ELECTRIC GE 17CM53A 4739326 DC ConTACTOR D463631
PRODUCTS UNLIMITED 51C 2 POLE 480V-AC ConTACTOR D456145
SIEMENS 3TF 110/120V-AC 50HP 80A AMP AC ConTACTOR B484658
ALLEN BRADLEY 100-C12ZJ200 3P 100-F BLOCK 24V-DC 10HP 25A AMP ConTACTOR B335856
ALLEN BRADLEY
120V-AC 27A AMP SIZE 1 REVERSING ConTACTOR B460685
SPRECHER+ SCHUH CV3-11 AUXILIARY ConTACT 110/127V-AC 16A AMP ConTACTOR B492029
KLOCKNER MOELLER DIL00-41/C 110V-AC 4KW 20A AMP ConTACTOR D339758
NEW ABB EH700C-4 480V-AC 600HP 715A AMP AC ConTACTOR B442270
ABB BC30C-EX ConTROL 3 PHASE POLE 24V-DC 30HP 45A AMP DC ConTACTOR B421460
ABB A26-30-01 600V-AC 15KW 3PH 110/110-120V-AC 25HP 40A AMP AC ConTACTOR B448358
NEW ALLEN BRADLEY 100-C09DJ01 SER A 24V-DC 7.5HP 25A AMP AC ConTACTOR D509519
NEW ALLEN BRADLEY 100-C12DJ01 24V-DC 7.5HP 25A AMP AC ConTACTOR D505863
GENERAL ELECTRIC CR353CB2AA1 DEFINITE PURPOSE 2P POLE 35A AMP ConTACTOR B269382
NEW FURNAS 42BF35AJR DEFINITE PURPOSE AC 24V-AC 15HP 30A AMP ConTACTOR B302497
GENERAL ELECTRIC GE 1D01EEA003XF DS303A DC 115/120V-DC 25A AMP ConTACTOR B323625
CUTLER HAMMER 647C056G20 COIL 380/400/440/480?V-AC REPLACEMENT ConTACTOR D387243
ABB EH260 600VAC MAGNETIC 24V-DC 250HP 300A AMP ConTACTOR D453846
KLOCKNER MOELLER DIL0M-GI-11 24V-DC 15HP 35A AMP ConTACTOR B370063
GENERAL ELECTRIC GE 173C951-1 ASSEMBLY REPLACEMENT PARTS ConTACTOR D451878
ALLEN BRADLEY 100-B250ND3 120V-AC 250HP 250A AMP AC ConTACTOR D488590
TELEMECANIQUE LC1DV-AC 7.5HP 20A AMP AC ConTACTOR B436637
ABB N80E RELAY BLOCK 4P 110-110-120V-AC 10A AMP AC ConTACTOR B460577
ALLEN BRADLEY
120V-AC 27A AMP SIZE 1 REVERSING AC ConTACTOR B464598
CUTLER HAMMER D15CR31 110/120V-AC 10A AMP AC ConTACTOR B470011
ALLEN BRADLEY 100S-C09D14C 100-FSC280 110/120V-AC 7.5HP AC ConTACTOR B383170
ALLEN BRADLEY 100-A12ND3 ConTROL 3P 120V-AC 10HP 12A AMP AC ConTACTOR B442436
KLOCKNER MOELLER DIL 00L-62-NA 24V-DC 1HP 20A AMP ConTACTOR B428190
ALLEN BRADLEY 100-A18ND3 110/120V-AC 15HP 18A AMP AC ConTACTOR B382283
NEW ALLEN BRADLEY 104-C12ZJ22 SER B 24V-DC 7.5HP 25A REVERSING ConTACTOR D511371
GENERAL ELECTRIC GE IC FIELD 250V 115V-DC 100A DC ConTACTOR D410410
GENERAL ELECTRIC GE ICH 230/250V-DC 10A AMP DC ConTACTOR D497218
ALLEN BRADLEY 100-C16ZJ10 SERIES B 600V-AC 24V-DC 15HP 30A AMP ConTACTOR B351785
ALLEN BRADLEY 100S-C30D14C GUARDMASTER 120V-AC 55A AMP ConTACTOR B359940
KLOCKNER MOELLER DIL00L-44-NA 300V-AC AC 24V-DC 1HP 20A AMP ConTACTOR B360823
CUTLER HAMMER MD-810 857D508G02 DC ConTACTOR 1350A AMP 2X 62.5V-DC COIL D205947本产品网址:/b2b/lujun/sell/itemid-.html

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