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直流系统培训课件(详细).ppt

  • 2026-04-08 20:20:43
直流系统培训课件(详细).ppt
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电源模块的工作原理框图说明:

    原边检测控制电路:监视交流输入电网的电压,实现输入过压、欠压、缺相保护功能及软启动的控制。 辅助电源为整个模块的控制电路及监控电路提供工作电源;

    EMI输入滤波器:其作用是实现对输入电源作净化处理,滤除高频干扰及吸收瞬态冲击,同时也阻碍本机产生的杂波反馈到公共电网。

    软启动:消除开机浪涌电流。

    三相整流与滤波:将电网交流电源直接整流为较平滑的直流电,以供下一级变换。

    全桥变换:将整流后的直流电变为高频交流(高频脉冲,100KHZ ) ,这是高频开关电源的核心部分,频率越高,体积、重量与输出功率之比越小。

    高频交流经主变压器隔离、全桥整流、滤波变换成直流输出;

    信号调节、PWM控制电路实现输出电压、电流的控制及调节,确保输出电源的稳定及可调整性;

    输出测量、故障保护及微机管理部分负责监测输出电压、电流及系统的工作状况,并将电源的输出电压、电流显示到前面板,实现故障判断及保护,协调管理模块的各项操作,并跟系统通信,实现电源模块的高度智能化。

集中监控器装于直流电源屏内,负责对直流系统各单元(如电压电流采集单元、充电模块、绝缘监测、电池巡检等)运行状态与数据的采集、显示;系统单元运行参数的设置,并控制各单元的正常运行;接收监控中心计算机发送来的命令及参数,并将系统运行状态及参数发送给监控中心计算机。 

监视正负母线对地电压、对地电阻值、接地支路号;充电模块参数、运行状态、充电模块输出电压、电流;蓄电池组电压、电流,母线电压、负荷电流,交流进线电压、电流;单只电池电压(系统配有电池巡检仪时)、电池环境温度;馈线开关状态或者故障。

绝缘监测仪用于监测直流系统电压及其绝缘情况,在直流电压过、欠压或直流系统绝缘强度降低等异常情况下发出声光告警,并将对应告警信息发至集中监控器。该装置安装在馈线柜上,支路巡查的传感器,分别装在每回馈线开关的抽屉内,各馈线开关的引出线穿过传感器的中心孔。该装置监测正负直流母线的对地电压和绝缘电阻,当正、负直流母线的对地绝缘电阻低于设定的报警值时,自动启动支路巡检功能。

支路巡检采用直流有源CT,不需向母线注入信号。每个CT内含CPU,被检信号直接在 CT 内部转换为数字信号,由CPU通过串行口上传至绝缘监测仪主机。支路检测精度高和抗干扰能力强。采用智能型CT,所有支路的漏电流检测同时进行,支路巡检速度高。 

系统接线方式 

目前国内电力用操作电源系统接线主要分为以下几种方式:

 1.以母线分段为标准可分为单母线接线方式、单母线分段接线方式、双母线接线方式等;

2.以降压装置为标准可分为带降压装置接线方式和不带降压装置接线方式;

3.以充电机和蓄电池组数为标准可分为一组充电机一组蓄电池方式、二组充电机一组蓄电池方式、二组充电机二组蓄电池方式、三组充电机二组蓄电池方式等。

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  1. CONNECT:[ UseTime:0.000584s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000834s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000373s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000502s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000544s ]
  8. SELECT * FROM `article` WHERE `id` = 476525 LIMIT 1 [ RunTime:0.000402s ]
  9. UPDATE `article` SET `lasttime` = 1775669513 WHERE `id` = 476525 [ RunTime:0.016852s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.004175s ]
  11. SELECT * FROM `article` WHERE `id` < 476525 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000698s ]
  12. SELECT * FROM `article` WHERE `id` > 476525 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000491s ]
  13. SELECT * FROM `article` WHERE `id` < 476525 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006720s ]
  14. SELECT * FROM `article` WHERE `id` < 476525 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001679s ]
  15. SELECT * FROM `article` WHERE `id` < 476525 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001485s ]
0.120185s