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配电自动化开关及线路保护整定计算原则.ppt

  • 2026-05-30 20:03:22
配电自动化开关及线路保护整定计算原则.ppt
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变电站10kV出线保护整定原则

变电站10千伏出线属于中性点不接地系统,其开关继电保护一般只采用三段式电流保护。

电流速断保护(Ⅰ段保护)

1)按躲下一级开关处三相最大短路电流整定,可靠系数不小于1.3;

2)校核开关出口在常见运行大方式下三相短路灵敏度宜不小于1.0,当灵敏度不足或计算定值超出装置整定范围时,可退出电流Ⅰ段保护;

3)若变压器抗短路能力差或者变压器年限超过25年,I段值应保证常见运行方式下开关出口处两相短路有灵敏度,且该灵敏度不小于1.0;

4)动作时间0s。

限时速断保护(II段保护)

1)应在下一级保护安装处(下一级保护一般指采用阶段电流保护)发生常用方式下各类金属性相间故障时有灵敏度,并躲过下一级保护范围末端三相最大短路电流整定,灵敏系数满足DL/T584的要求;灵敏度不满足要求时,按灵敏度取值。

2)按躲过配变低压侧故障三相最大短路电流整定,可靠系数不小于1.3;

3)应与下一级电流Ⅰ段保护或电流Ⅱ段保护配合,需要时可以与下一级全线速动保护配合;

4)动作时间按配合整定,一般为0.3s。

过流保护(ⅠII段保护)

1)应在本线路发生小方式下各类金属性相间故障时有灵敏度,灵敏系数不小于1.5;

2)应满足主变低压侧电流保护限额要求;

3)应与下一级电流Ⅱ段保护配合;

4)按躲本线路正常最大负荷电流整定;

5)若线路电动机负荷较大,具备条件的保护可投入复压闭锁,不具备条件的电流Ⅲ段保护定值应考虑电动机启动电流及自启动电流影响;

6)动作时间按配合整定,一般为0.5s~0.9s,应满足主变低压侧复压过流时限限值数。

配电自动化开关保护类型与整定原则

由于不同终端配置的保护功能存在差异性,整定原则主要分为四类:

集中式自动化保护

分段电压时间型策略+分支末端电流保护

阶段式保护融合策略式

分段电压时间型后加速策略+分支电流保护。

其中分段电压时间型策略+分支末端电流保护整定原则适用于大多数普通类型终端,后两种类型则需要根据终端保护类型进行选择。

集中式自动化保护

实现方法:主要借助通信手段,通过配电终端和配电主站的配合,在发生故障时依靠配电主站判别故障区域,根据出线开关跳闸以及线路开关过流保护动作信号作为启动条件来进行故障识别,上送配网故障测量信息的终端形成故障路径信息,并依据故障点在故障路径末端的原则实现故障定位,再通过自动遥控或人工方式隔离故障区域,恢复非故障区域供电。

集中式自动化保护

线路集中式开关:采用过流I段保护和过流II段保护,仅发信。

过流I段保护

1)应与出线开关限时速断定值配合,可靠系数不小于1.1;

2)在应在下一级保护安装处(下一级保护一般指采用电流保护)或线路末端发生常用方式下各类金属性相间故障时有灵敏度;

3)动作时间0s,发信。

过流II段保护

1)应与出线开关过流定值配合,可靠系数不小于1.1;

2)动作时间与上一级开关时限配合,级差为0.1s~0.3s,发信。

分段电压时间型策略+分支末端电流保护

实现方法:1、线路分段开关采用电压时间型,通过开关“无压分闸、来电延时合闸”的工作特性配合变电站出线开关二次合闸来实现,一次合闸隔离故障区间,二次合闸恢复非故障段供电。

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  1. CONNECT:[ UseTime:0.000683s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000743s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000330s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000473s ]
  6. SELECT * FROM `set` [ RunTime:0.000221s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000559s ]
  8. SELECT * FROM `article` WHERE `id` = 522753 LIMIT 1 [ RunTime:0.003413s ]
  9. UPDATE `article` SET `lasttime` = 1780357040 WHERE `id` = 522753 [ RunTime:0.002297s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000239s ]
  11. SELECT * FROM `article` WHERE `id` < 522753 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000402s ]
  12. SELECT * FROM `article` WHERE `id` > 522753 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004370s ]
  13. SELECT * FROM `article` WHERE `id` < 522753 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012200s ]
  14. SELECT * FROM `article` WHERE `id` < 522753 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006744s ]
  15. SELECT * FROM `article` WHERE `id` < 522753 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004234s ]
0.103302s