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干货‖站用变系统基本知识课件

  • 2026-07-25 07:02:40
干货‖站用变系统基本知识课件

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1.站用变系统主要由变压器、高低压开关、高低压电流互感器、低压电压互感器、380V/220V母线、低压开关柜、低压馈线、相应的保护及备自投等组成,为变电站提供380V/220V交流电源。

2.当站用变失压后,站内直流蓄电池供全站直流负荷并通过逆变供部分交流负荷(约能维持2小时)。

备自投功能:当工作电源因故障断开后,能自动将备用电源投入工作或将负荷切换到备用电源上去的一种自动装置,简称备自投装置。

备自投主要形式有:

分段(母联)备投:每条电源进线各带一段母线,分段(母联)热备用状态,两条

进线互为暗备用。

进线(变压器)备投

一条电源进线带两段母线并列运行,另一条进线明备用

ATS(自动切换开关):当两路站用电正常时可任选一路电源供电。在自动模式下:当任意一路电源由于故障或需要而退出时,可自动切换至另一路电源供电,当退出电源恢复正常时,可自动恢复至主供电源供电。

站用变出现下列情况时,应立即停止运行:

1.变压器内部声响很大,同时发出强烈不均匀的爆裂噪音;

2.油浸式变压器大量漏油,油面表计看不到油位;

3.油面急剧上涨,防爆膜破裂,向外喷油喷烟;

4.套管严重破裂或有明显裂纹,有严重放电现象;

5.变压器着火。

站用电失电事故现象:站用电屏上三相交流电压、电流表指示为零,晶闸管整流跳闸,直流电压稍有下降,主变冷却电源失电及站用变保护光字牌亮。

站用变故障跳闸时,运行人员应迅速进行下列工作:

1.在监控后台站用变系统单元检查开关动作情况;

2.监控后台站用变保护单元检查光字牌动作情况;

3.检查站用变保护装置的指示灯和液晶屏信息;

4.检查站用变备自投装置的指示灯和液晶屏信息;

5.检查站用变、开关(手车)、电流互感器、380V/220V母线和馈线等设备有无异常情况

6.综合分析判断故障地点、原因。

若发生爆炸、起火现象,可根据现场情况及时灭火或通知消防人员,保证人身安全的情况下避免事故的扩大。

正常运行方式下,一台站变发生故障

1.有备自投装置的站用变压器失电时要求运行人员检查站变备自投是否动作,若备自投故障,值班人员立即将备用电源手动投入,并退出站变备自投。

2.隔离故障点,将站用变转为检修状态。

3.通知相关班组处理故障。站内只有一台站用变情况下则要求启动发电车等备用发电设备。

其中一台站变检修,另一台站变发生故障

1.接到变电站、监控班的汇报,核对自动化系统确认站用变故障。

2.正在进行倒闸操作的应立即中断。

3.要求变电站检查全站的保护装置、测控装置运行情况,并将异常情况汇报。

4.若检修工作结束,迅速恢复站用变运行。

5.检修工作未完成,如有外来电源,明确外来电源供电正常,将站内负荷切换至外来电源。

6.隔离故障点,将故障站用变转为检修状态。

7.长时间内无法恢复站用电的,要求准备发电车等备用发电设备。

声明:本号发原创或转载文章仅个人观点,仅供学习交流,无任何商业用途,本文为继保小家整理发布,图片来源网络,凡侵必删。欢迎左下角👇点“+关注”,方便下次阅读和交流。文章结束,请给点👍个“赞"和“在看”,给小编们一点鼓励和支持!非常感谢!→→→扫描下面二维码获取更多资料!                                                            

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  1. CONNECT:[ UseTime:0.000497s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000729s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000280s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000238s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000478s ]
  6. SELECT * FROM `set` [ RunTime:0.000209s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000506s ]
  8. SELECT * FROM `article` WHERE `id` = 519955 LIMIT 1 [ RunTime:0.000407s ]
  9. UPDATE `article` SET `lasttime` = 1785168974 WHERE `id` = 519955 [ RunTime:0.005747s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000281s ]
  11. SELECT * FROM `article` WHERE `id` < 519955 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000458s ]
  12. SELECT * FROM `article` WHERE `id` > 519955 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000448s ]
  13. SELECT * FROM `article` WHERE `id` < 519955 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000694s ]
  14. SELECT * FROM `article` WHERE `id` < 519955 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008547s ]
  15. SELECT * FROM `article` WHERE `id` < 519955 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005168s ]
0.090047s