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直流系统及UPS培训课件

  • 2026-04-09 18:58:11
直流系统及UPS培训课件

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1.在发电厂、变电所直流系统中,普遍采用蓄电池组作为直流电源。蓄电池组是一种独立可靠的电源,它可以在发电厂、变电所内发生任何事故,甚至在全厂交流电源都停电的情况下,仍能保证直流系统中的用电设备可靠而连续的工作。否则在交流电源完全消失的情况下,一切控制、保护、自动装置都将失去作用,甚至在夜间照明也会没有,这显然不利于机组安全、可靠地运行和及时地进行事故处理。

2.本工程设置电压为220V,容量为500Ah的直流系统一套,主要用作系统中主断路器的操作、控制电源以及UPS系统直流电源、二次回路中的仪器、仪表、继电保护、自动控制和事故照明的电源。

3.直流系统组成:

直流系统由电池屏、直流充电屏、馈线屏组成。

(1).电池屏

电池屏就是一个可以摆放多节电池的机柜。电池屏中的电池一般是由2V-12V的电池以一定数量串联方式组成,对应电的电压输出也就是110V或220V。

本工程直流系统蓄电池配置为:220V,500Ah,免维护阀控蓄电池。

(2).直流屏

包括:交流配电(将交流电源引入分配给各个充电模块)

充电模块(完成AC/DC变换);

电池监测仪(监测单只/组电池的电压、电流、容量等参数)

绝缘监测(实现系统母线和支路的绝缘状况监测)

监控模块(将系统的交、直流中的各种模拟量、开关量信号采集并处理,同时提供声光报警;进行系统的智能管理,实现人机对话界面的通讯和后台机的远程监控)

人机对话界面(显示系统运行过程中的重要数据,查询系统故障报警信息)

4.直流系统工作原理:

两路交流输入经交流配电单元互投后,选择其中一路交流输入提供给充电模块;充电模块输出稳定的直流电源,一方面对蓄电池组补充充电,另一方面提供合闸输出(或控制输出),为负载提供正常的工作电流;绝缘监测单元可在线监测直流母线和各支路的对地绝缘状况;集中监控单元可实现对交流配电单元、充电模块、直流馈电、绝缘监测单元、直流母线和蓄电池组等运行参数的采集与各单元的控制和管理,并可通过远程接口接受后台操作员的监控。

6.直流系统的运行方式:

充电器-蓄电池组的运行方式有充-放电方式和浮充电方式两种,发电厂中的充电器-蓄电池组一般采用浮充电方式运行。

(1).蓄电池组的充-放电运行方式就是对运行中的蓄电池组进行定期的充电,以保持蓄电池的良好状态。其工作特点是正常工作时,充电设备退出,由充好电的蓄电池向直流负荷供电。

为了保证在事故情况下蓄电池组能可靠的工作,蓄电池组正常放电时必须留有一定的裕量,决不能使蓄电池完全放电。通常放电约达容量的60%-70%时,便应停止放电,将充电设备投入,进行充电。在充电过程中充电设备除了向蓄电池组供电以外,还要担负经常性直流负载,故充电设备必须有足够的容量。

(2).蓄电池的浮充电运行方式:

浮充电方式是充电器与蓄电池组并列运行于直流母线上的运行方式,正常运行时,主要由充电设备供给正常的直流负载,同时还以不大的电流补充蓄电池的自放电。蓄电池平时不供电,只有在负载突然增大(如断路器合闸等),充电设备满足不了时,蓄电池才少量放电。这种运行方式称为浮充电方式。

浮充电运行方式的优点:

①.蓄电池组经常处于满充电状态,其容量可以被充分利用。

②.正常运行中,直流母线电源是恒定的,无需调节。

③.由于补偿了蓄电池的自放电,因而使蓄电池使用寿命延长。

④.不需经常充放电,简化了运行维护,提高了安全性。

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  1. CONNECT:[ UseTime:0.000408s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000578s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000297s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000326s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000548s ]
  6. SELECT * FROM `set` [ RunTime:0.000283s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000563s ]
  8. SELECT * FROM `article` WHERE `id` = 486526 LIMIT 1 [ RunTime:0.000674s ]
  9. UPDATE `article` SET `lasttime` = 1775985562 WHERE `id` = 486526 [ RunTime:0.001050s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000242s ]
  11. SELECT * FROM `article` WHERE `id` < 486526 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000403s ]
  12. SELECT * FROM `article` WHERE `id` > 486526 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000410s ]
  13. SELECT * FROM `article` WHERE `id` < 486526 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002903s ]
  14. SELECT * FROM `article` WHERE `id` < 486526 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005987s ]
  15. SELECT * FROM `article` WHERE `id` < 486526 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006685s ]
0.120115s